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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
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 <linux/fsverity.h>
31#include <linux/sched/xacct.h>
32#include "ctree.h"
33#include "disk-io.h"
34#include "export.h"
35#include "transaction.h"
36#include "btrfs_inode.h"
37#include "print-tree.h"
38#include "volumes.h"
39#include "locking.h"
40#include "backref.h"
41#include "rcu-string.h"
42#include "send.h"
43#include "dev-replace.h"
44#include "props.h"
45#include "sysfs.h"
46#include "qgroup.h"
47#include "tree-log.h"
48#include "compression.h"
49#include "space-info.h"
50#include "delalloc-space.h"
51#include "block-group.h"
52#include "subpage.h"
53#include "fs.h"
54#include "accessors.h"
55#include "extent-tree.h"
56#include "root-tree.h"
57#include "defrag.h"
58#include "dir-item.h"
59#include "uuid-tree.h"
60#include "ioctl.h"
61#include "file.h"
62#include "scrub.h"
63#include "super.h"
64
65#ifdef CONFIG_64BIT
66/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
67 * structures are incorrect, as the timespec structure from userspace
68 * is 4 bytes too small. We define these alternatives here to teach
69 * the kernel about the 32-bit struct packing.
70 */
71struct btrfs_ioctl_timespec_32 {
72 __u64 sec;
73 __u32 nsec;
74} __attribute__ ((__packed__));
75
76struct btrfs_ioctl_received_subvol_args_32 {
77 char uuid[BTRFS_UUID_SIZE]; /* in */
78 __u64 stransid; /* in */
79 __u64 rtransid; /* out */
80 struct btrfs_ioctl_timespec_32 stime; /* in */
81 struct btrfs_ioctl_timespec_32 rtime; /* out */
82 __u64 flags; /* in */
83 __u64 reserved[16]; /* in */
84} __attribute__ ((__packed__));
85
86#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
87 struct btrfs_ioctl_received_subvol_args_32)
88#endif
89
90#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
91struct btrfs_ioctl_send_args_32 {
92 __s64 send_fd; /* in */
93 __u64 clone_sources_count; /* in */
94 compat_uptr_t clone_sources; /* in */
95 __u64 parent_root; /* in */
96 __u64 flags; /* in */
97 __u32 version; /* in */
98 __u8 reserved[28]; /* in */
99} __attribute__ ((__packed__));
100
101#define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
102 struct btrfs_ioctl_send_args_32)
103
104struct btrfs_ioctl_encoded_io_args_32 {
105 compat_uptr_t iov;
106 compat_ulong_t iovcnt;
107 __s64 offset;
108 __u64 flags;
109 __u64 len;
110 __u64 unencoded_len;
111 __u64 unencoded_offset;
112 __u32 compression;
113 __u32 encryption;
114 __u8 reserved[64];
115};
116
117#define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \
118 struct btrfs_ioctl_encoded_io_args_32)
119#define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \
120 struct btrfs_ioctl_encoded_io_args_32)
121#endif
122
123/* Mask out flags that are inappropriate for the given type of inode. */
124static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
125 unsigned int flags)
126{
127 if (S_ISDIR(inode->i_mode))
128 return flags;
129 else if (S_ISREG(inode->i_mode))
130 return flags & ~FS_DIRSYNC_FL;
131 else
132 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
133}
134
135/*
136 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
137 * ioctl.
138 */
139static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode)
140{
141 unsigned int iflags = 0;
142 u32 flags = binode->flags;
143 u32 ro_flags = binode->ro_flags;
144
145 if (flags & BTRFS_INODE_SYNC)
146 iflags |= FS_SYNC_FL;
147 if (flags & BTRFS_INODE_IMMUTABLE)
148 iflags |= FS_IMMUTABLE_FL;
149 if (flags & BTRFS_INODE_APPEND)
150 iflags |= FS_APPEND_FL;
151 if (flags & BTRFS_INODE_NODUMP)
152 iflags |= FS_NODUMP_FL;
153 if (flags & BTRFS_INODE_NOATIME)
154 iflags |= FS_NOATIME_FL;
155 if (flags & BTRFS_INODE_DIRSYNC)
156 iflags |= FS_DIRSYNC_FL;
157 if (flags & BTRFS_INODE_NODATACOW)
158 iflags |= FS_NOCOW_FL;
159 if (ro_flags & BTRFS_INODE_RO_VERITY)
160 iflags |= FS_VERITY_FL;
161
162 if (flags & BTRFS_INODE_NOCOMPRESS)
163 iflags |= FS_NOCOMP_FL;
164 else if (flags & BTRFS_INODE_COMPRESS)
165 iflags |= FS_COMPR_FL;
166
167 return iflags;
168}
169
170/*
171 * Update inode->i_flags based on the btrfs internal flags.
172 */
173void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
174{
175 struct btrfs_inode *binode = BTRFS_I(inode);
176 unsigned int new_fl = 0;
177
178 if (binode->flags & BTRFS_INODE_SYNC)
179 new_fl |= S_SYNC;
180 if (binode->flags & BTRFS_INODE_IMMUTABLE)
181 new_fl |= S_IMMUTABLE;
182 if (binode->flags & BTRFS_INODE_APPEND)
183 new_fl |= S_APPEND;
184 if (binode->flags & BTRFS_INODE_NOATIME)
185 new_fl |= S_NOATIME;
186 if (binode->flags & BTRFS_INODE_DIRSYNC)
187 new_fl |= S_DIRSYNC;
188 if (binode->ro_flags & BTRFS_INODE_RO_VERITY)
189 new_fl |= S_VERITY;
190
191 set_mask_bits(&inode->i_flags,
192 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC |
193 S_VERITY, new_fl);
194}
195
196/*
197 * Check if @flags are a supported and valid set of FS_*_FL flags and that
198 * the old and new flags are not conflicting
199 */
200static int check_fsflags(unsigned int old_flags, unsigned int flags)
201{
202 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
203 FS_NOATIME_FL | FS_NODUMP_FL | \
204 FS_SYNC_FL | FS_DIRSYNC_FL | \
205 FS_NOCOMP_FL | FS_COMPR_FL |
206 FS_NOCOW_FL))
207 return -EOPNOTSUPP;
208
209 /* COMPR and NOCOMP on new/old are valid */
210 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
211 return -EINVAL;
212
213 if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
214 return -EINVAL;
215
216 /* NOCOW and compression options are mutually exclusive */
217 if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
218 return -EINVAL;
219 if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
220 return -EINVAL;
221
222 return 0;
223}
224
225static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
226 unsigned int flags)
227{
228 if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL))
229 return -EPERM;
230
231 return 0;
232}
233
234/*
235 * Set flags/xflags from the internal inode flags. The remaining items of
236 * fsxattr are zeroed.
237 */
238int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
239{
240 struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
241
242 fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode));
243 return 0;
244}
245
246int btrfs_fileattr_set(struct user_namespace *mnt_userns,
247 struct dentry *dentry, struct fileattr *fa)
248{
249 struct inode *inode = d_inode(dentry);
250 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
251 struct btrfs_inode *binode = BTRFS_I(inode);
252 struct btrfs_root *root = binode->root;
253 struct btrfs_trans_handle *trans;
254 unsigned int fsflags, old_fsflags;
255 int ret;
256 const char *comp = NULL;
257 u32 binode_flags;
258
259 if (btrfs_root_readonly(root))
260 return -EROFS;
261
262 if (fileattr_has_fsx(fa))
263 return -EOPNOTSUPP;
264
265 fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
266 old_fsflags = btrfs_inode_flags_to_fsflags(binode);
267 ret = check_fsflags(old_fsflags, fsflags);
268 if (ret)
269 return ret;
270
271 ret = check_fsflags_compatible(fs_info, fsflags);
272 if (ret)
273 return ret;
274
275 binode_flags = binode->flags;
276 if (fsflags & FS_SYNC_FL)
277 binode_flags |= BTRFS_INODE_SYNC;
278 else
279 binode_flags &= ~BTRFS_INODE_SYNC;
280 if (fsflags & FS_IMMUTABLE_FL)
281 binode_flags |= BTRFS_INODE_IMMUTABLE;
282 else
283 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
284 if (fsflags & FS_APPEND_FL)
285 binode_flags |= BTRFS_INODE_APPEND;
286 else
287 binode_flags &= ~BTRFS_INODE_APPEND;
288 if (fsflags & FS_NODUMP_FL)
289 binode_flags |= BTRFS_INODE_NODUMP;
290 else
291 binode_flags &= ~BTRFS_INODE_NODUMP;
292 if (fsflags & FS_NOATIME_FL)
293 binode_flags |= BTRFS_INODE_NOATIME;
294 else
295 binode_flags &= ~BTRFS_INODE_NOATIME;
296
297 /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
298 if (!fa->flags_valid) {
299 /* 1 item for the inode */
300 trans = btrfs_start_transaction(root, 1);
301 if (IS_ERR(trans))
302 return PTR_ERR(trans);
303 goto update_flags;
304 }
305
306 if (fsflags & FS_DIRSYNC_FL)
307 binode_flags |= BTRFS_INODE_DIRSYNC;
308 else
309 binode_flags &= ~BTRFS_INODE_DIRSYNC;
310 if (fsflags & FS_NOCOW_FL) {
311 if (S_ISREG(inode->i_mode)) {
312 /*
313 * It's safe to turn csums off here, no extents exist.
314 * Otherwise we want the flag to reflect the real COW
315 * status of the file and will not set it.
316 */
317 if (inode->i_size == 0)
318 binode_flags |= BTRFS_INODE_NODATACOW |
319 BTRFS_INODE_NODATASUM;
320 } else {
321 binode_flags |= BTRFS_INODE_NODATACOW;
322 }
323 } else {
324 /*
325 * Revert back under same assumptions as above
326 */
327 if (S_ISREG(inode->i_mode)) {
328 if (inode->i_size == 0)
329 binode_flags &= ~(BTRFS_INODE_NODATACOW |
330 BTRFS_INODE_NODATASUM);
331 } else {
332 binode_flags &= ~BTRFS_INODE_NODATACOW;
333 }
334 }
335
336 /*
337 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
338 * flag may be changed automatically if compression code won't make
339 * things smaller.
340 */
341 if (fsflags & FS_NOCOMP_FL) {
342 binode_flags &= ~BTRFS_INODE_COMPRESS;
343 binode_flags |= BTRFS_INODE_NOCOMPRESS;
344 } else if (fsflags & FS_COMPR_FL) {
345
346 if (IS_SWAPFILE(inode))
347 return -ETXTBSY;
348
349 binode_flags |= BTRFS_INODE_COMPRESS;
350 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
351
352 comp = btrfs_compress_type2str(fs_info->compress_type);
353 if (!comp || comp[0] == 0)
354 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
355 } else {
356 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
357 }
358
359 /*
360 * 1 for inode item
361 * 2 for properties
362 */
363 trans = btrfs_start_transaction(root, 3);
364 if (IS_ERR(trans))
365 return PTR_ERR(trans);
366
367 if (comp) {
368 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
369 strlen(comp), 0);
370 if (ret) {
371 btrfs_abort_transaction(trans, ret);
372 goto out_end_trans;
373 }
374 } else {
375 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
376 0, 0);
377 if (ret && ret != -ENODATA) {
378 btrfs_abort_transaction(trans, ret);
379 goto out_end_trans;
380 }
381 }
382
383update_flags:
384 binode->flags = binode_flags;
385 btrfs_sync_inode_flags_to_i_flags(inode);
386 inode_inc_iversion(inode);
387 inode->i_ctime = current_time(inode);
388 ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
389
390 out_end_trans:
391 btrfs_end_transaction(trans);
392 return ret;
393}
394
395/*
396 * Start exclusive operation @type, return true on success
397 */
398bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
399 enum btrfs_exclusive_operation type)
400{
401 bool ret = false;
402
403 spin_lock(&fs_info->super_lock);
404 if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) {
405 fs_info->exclusive_operation = type;
406 ret = true;
407 }
408 spin_unlock(&fs_info->super_lock);
409
410 return ret;
411}
412
413/*
414 * Conditionally allow to enter the exclusive operation in case it's compatible
415 * with the running one. This must be paired with btrfs_exclop_start_unlock and
416 * btrfs_exclop_finish.
417 *
418 * Compatibility:
419 * - the same type is already running
420 * - when trying to add a device and balance has been paused
421 * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller
422 * must check the condition first that would allow none -> @type
423 */
424bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
425 enum btrfs_exclusive_operation type)
426{
427 spin_lock(&fs_info->super_lock);
428 if (fs_info->exclusive_operation == type ||
429 (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED &&
430 type == BTRFS_EXCLOP_DEV_ADD))
431 return true;
432
433 spin_unlock(&fs_info->super_lock);
434 return false;
435}
436
437void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info)
438{
439 spin_unlock(&fs_info->super_lock);
440}
441
442void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
443{
444 spin_lock(&fs_info->super_lock);
445 WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
446 spin_unlock(&fs_info->super_lock);
447 sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
448}
449
450void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
451 enum btrfs_exclusive_operation op)
452{
453 switch (op) {
454 case BTRFS_EXCLOP_BALANCE_PAUSED:
455 spin_lock(&fs_info->super_lock);
456 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE ||
457 fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD);
458 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED;
459 spin_unlock(&fs_info->super_lock);
460 break;
461 case BTRFS_EXCLOP_BALANCE:
462 spin_lock(&fs_info->super_lock);
463 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
464 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE;
465 spin_unlock(&fs_info->super_lock);
466 break;
467 default:
468 btrfs_warn(fs_info,
469 "invalid exclop balance operation %d requested", op);
470 }
471}
472
473static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg)
474{
475 return put_user(inode->i_generation, arg);
476}
477
478static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
479 void __user *arg)
480{
481 struct btrfs_device *device;
482 struct fstrim_range range;
483 u64 minlen = ULLONG_MAX;
484 u64 num_devices = 0;
485 int ret;
486
487 if (!capable(CAP_SYS_ADMIN))
488 return -EPERM;
489
490 /*
491 * btrfs_trim_block_group() depends on space cache, which is not
492 * available in zoned filesystem. So, disallow fitrim on a zoned
493 * filesystem for now.
494 */
495 if (btrfs_is_zoned(fs_info))
496 return -EOPNOTSUPP;
497
498 /*
499 * If the fs is mounted with nologreplay, which requires it to be
500 * mounted in RO mode as well, we can not allow discard on free space
501 * inside block groups, because log trees refer to extents that are not
502 * pinned in a block group's free space cache (pinning the extents is
503 * precisely the first phase of replaying a log tree).
504 */
505 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
506 return -EROFS;
507
508 rcu_read_lock();
509 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
510 dev_list) {
511 if (!device->bdev || !bdev_max_discard_sectors(device->bdev))
512 continue;
513 num_devices++;
514 minlen = min_t(u64, bdev_discard_granularity(device->bdev),
515 minlen);
516 }
517 rcu_read_unlock();
518
519 if (!num_devices)
520 return -EOPNOTSUPP;
521 if (copy_from_user(&range, arg, sizeof(range)))
522 return -EFAULT;
523
524 /*
525 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
526 * block group is in the logical address space, which can be any
527 * sectorsize aligned bytenr in the range [0, U64_MAX].
528 */
529 if (range.len < fs_info->sb->s_blocksize)
530 return -EINVAL;
531
532 range.minlen = max(range.minlen, minlen);
533 ret = btrfs_trim_fs(fs_info, &range);
534 if (ret < 0)
535 return ret;
536
537 if (copy_to_user(arg, &range, sizeof(range)))
538 return -EFAULT;
539
540 return 0;
541}
542
543int __pure btrfs_is_empty_uuid(u8 *uuid)
544{
545 int i;
546
547 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
548 if (uuid[i])
549 return 0;
550 }
551 return 1;
552}
553
554/*
555 * Calculate the number of transaction items to reserve for creating a subvolume
556 * or snapshot, not including the inode, directory entries, or parent directory.
557 */
558static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit)
559{
560 /*
561 * 1 to add root block
562 * 1 to add root item
563 * 1 to add root ref
564 * 1 to add root backref
565 * 1 to add UUID item
566 * 1 to add qgroup info
567 * 1 to add qgroup limit
568 *
569 * Ideally the last two would only be accounted if qgroups are enabled,
570 * but that can change between now and the time we would insert them.
571 */
572 unsigned int num_items = 7;
573
574 if (inherit) {
575 /* 2 to add qgroup relations for each inherited qgroup */
576 num_items += 2 * inherit->num_qgroups;
577 }
578 return num_items;
579}
580
581static noinline int create_subvol(struct user_namespace *mnt_userns,
582 struct inode *dir, struct dentry *dentry,
583 struct btrfs_qgroup_inherit *inherit)
584{
585 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
586 struct btrfs_trans_handle *trans;
587 struct btrfs_key key;
588 struct btrfs_root_item *root_item;
589 struct btrfs_inode_item *inode_item;
590 struct extent_buffer *leaf;
591 struct btrfs_root *root = BTRFS_I(dir)->root;
592 struct btrfs_root *new_root;
593 struct btrfs_block_rsv block_rsv;
594 struct timespec64 cur_time = current_time(dir);
595 struct btrfs_new_inode_args new_inode_args = {
596 .dir = dir,
597 .dentry = dentry,
598 .subvol = true,
599 };
600 unsigned int trans_num_items;
601 int ret;
602 dev_t anon_dev;
603 u64 objectid;
604
605 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
606 if (!root_item)
607 return -ENOMEM;
608
609 ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid);
610 if (ret)
611 goto out_root_item;
612
613 /*
614 * Don't create subvolume whose level is not zero. Or qgroup will be
615 * screwed up since it assumes subvolume qgroup's level to be 0.
616 */
617 if (btrfs_qgroup_level(objectid)) {
618 ret = -ENOSPC;
619 goto out_root_item;
620 }
621
622 ret = get_anon_bdev(&anon_dev);
623 if (ret < 0)
624 goto out_root_item;
625
626 new_inode_args.inode = btrfs_new_subvol_inode(mnt_userns, dir);
627 if (!new_inode_args.inode) {
628 ret = -ENOMEM;
629 goto out_anon_dev;
630 }
631 ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items);
632 if (ret)
633 goto out_inode;
634 trans_num_items += create_subvol_num_items(inherit);
635
636 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
637 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
638 trans_num_items, false);
639 if (ret)
640 goto out_new_inode_args;
641
642 trans = btrfs_start_transaction(root, 0);
643 if (IS_ERR(trans)) {
644 ret = PTR_ERR(trans);
645 btrfs_subvolume_release_metadata(root, &block_rsv);
646 goto out_new_inode_args;
647 }
648 trans->block_rsv = &block_rsv;
649 trans->bytes_reserved = block_rsv.size;
650
651 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
652 if (ret)
653 goto out;
654
655 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
656 BTRFS_NESTING_NORMAL);
657 if (IS_ERR(leaf)) {
658 ret = PTR_ERR(leaf);
659 goto out;
660 }
661
662 btrfs_mark_buffer_dirty(leaf);
663
664 inode_item = &root_item->inode;
665 btrfs_set_stack_inode_generation(inode_item, 1);
666 btrfs_set_stack_inode_size(inode_item, 3);
667 btrfs_set_stack_inode_nlink(inode_item, 1);
668 btrfs_set_stack_inode_nbytes(inode_item,
669 fs_info->nodesize);
670 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
671
672 btrfs_set_root_flags(root_item, 0);
673 btrfs_set_root_limit(root_item, 0);
674 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
675
676 btrfs_set_root_bytenr(root_item, leaf->start);
677 btrfs_set_root_generation(root_item, trans->transid);
678 btrfs_set_root_level(root_item, 0);
679 btrfs_set_root_refs(root_item, 1);
680 btrfs_set_root_used(root_item, leaf->len);
681 btrfs_set_root_last_snapshot(root_item, 0);
682
683 btrfs_set_root_generation_v2(root_item,
684 btrfs_root_generation(root_item));
685 generate_random_guid(root_item->uuid);
686 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
687 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
688 root_item->ctime = root_item->otime;
689 btrfs_set_root_ctransid(root_item, trans->transid);
690 btrfs_set_root_otransid(root_item, trans->transid);
691
692 btrfs_tree_unlock(leaf);
693
694 btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID);
695
696 key.objectid = objectid;
697 key.offset = 0;
698 key.type = BTRFS_ROOT_ITEM_KEY;
699 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
700 root_item);
701 if (ret) {
702 /*
703 * Since we don't abort the transaction in this case, free the
704 * tree block so that we don't leak space and leave the
705 * filesystem in an inconsistent state (an extent item in the
706 * extent tree with a backreference for a root that does not
707 * exists).
708 */
709 btrfs_tree_lock(leaf);
710 btrfs_clean_tree_block(leaf);
711 btrfs_tree_unlock(leaf);
712 btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
713 free_extent_buffer(leaf);
714 goto out;
715 }
716
717 free_extent_buffer(leaf);
718 leaf = NULL;
719
720 new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev);
721 if (IS_ERR(new_root)) {
722 ret = PTR_ERR(new_root);
723 btrfs_abort_transaction(trans, ret);
724 goto out;
725 }
726 /* anon_dev is owned by new_root now. */
727 anon_dev = 0;
728 BTRFS_I(new_inode_args.inode)->root = new_root;
729 /* ... and new_root is owned by new_inode_args.inode now. */
730
731 ret = btrfs_record_root_in_trans(trans, new_root);
732 if (ret) {
733 btrfs_abort_transaction(trans, ret);
734 goto out;
735 }
736
737 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
738 BTRFS_UUID_KEY_SUBVOL, objectid);
739 if (ret) {
740 btrfs_abort_transaction(trans, ret);
741 goto out;
742 }
743
744 ret = btrfs_create_new_inode(trans, &new_inode_args);
745 if (ret) {
746 btrfs_abort_transaction(trans, ret);
747 goto out;
748 }
749
750 d_instantiate_new(dentry, new_inode_args.inode);
751 new_inode_args.inode = NULL;
752
753out:
754 trans->block_rsv = NULL;
755 trans->bytes_reserved = 0;
756 btrfs_subvolume_release_metadata(root, &block_rsv);
757
758 if (ret)
759 btrfs_end_transaction(trans);
760 else
761 ret = btrfs_commit_transaction(trans);
762out_new_inode_args:
763 btrfs_new_inode_args_destroy(&new_inode_args);
764out_inode:
765 iput(new_inode_args.inode);
766out_anon_dev:
767 if (anon_dev)
768 free_anon_bdev(anon_dev);
769out_root_item:
770 kfree(root_item);
771 return ret;
772}
773
774static int create_snapshot(struct btrfs_root *root, struct inode *dir,
775 struct dentry *dentry, bool readonly,
776 struct btrfs_qgroup_inherit *inherit)
777{
778 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
779 struct inode *inode;
780 struct btrfs_pending_snapshot *pending_snapshot;
781 unsigned int trans_num_items;
782 struct btrfs_trans_handle *trans;
783 int ret;
784
785 /* We do not support snapshotting right now. */
786 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
787 btrfs_warn(fs_info,
788 "extent tree v2 doesn't support snapshotting yet");
789 return -EOPNOTSUPP;
790 }
791
792 if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
793 return -EINVAL;
794
795 if (atomic_read(&root->nr_swapfiles)) {
796 btrfs_warn(fs_info,
797 "cannot snapshot subvolume with active swapfile");
798 return -ETXTBSY;
799 }
800
801 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
802 if (!pending_snapshot)
803 return -ENOMEM;
804
805 ret = get_anon_bdev(&pending_snapshot->anon_dev);
806 if (ret < 0)
807 goto free_pending;
808 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
809 GFP_KERNEL);
810 pending_snapshot->path = btrfs_alloc_path();
811 if (!pending_snapshot->root_item || !pending_snapshot->path) {
812 ret = -ENOMEM;
813 goto free_pending;
814 }
815
816 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
817 BTRFS_BLOCK_RSV_TEMP);
818 /*
819 * 1 to add dir item
820 * 1 to add dir index
821 * 1 to update parent inode item
822 */
823 trans_num_items = create_subvol_num_items(inherit) + 3;
824 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
825 &pending_snapshot->block_rsv,
826 trans_num_items, false);
827 if (ret)
828 goto free_pending;
829
830 pending_snapshot->dentry = dentry;
831 pending_snapshot->root = root;
832 pending_snapshot->readonly = readonly;
833 pending_snapshot->dir = dir;
834 pending_snapshot->inherit = inherit;
835
836 trans = btrfs_start_transaction(root, 0);
837 if (IS_ERR(trans)) {
838 ret = PTR_ERR(trans);
839 goto fail;
840 }
841
842 trans->pending_snapshot = pending_snapshot;
843
844 ret = btrfs_commit_transaction(trans);
845 if (ret)
846 goto fail;
847
848 ret = pending_snapshot->error;
849 if (ret)
850 goto fail;
851
852 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
853 if (ret)
854 goto fail;
855
856 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
857 if (IS_ERR(inode)) {
858 ret = PTR_ERR(inode);
859 goto fail;
860 }
861
862 d_instantiate(dentry, inode);
863 ret = 0;
864 pending_snapshot->anon_dev = 0;
865fail:
866 /* Prevent double freeing of anon_dev */
867 if (ret && pending_snapshot->snap)
868 pending_snapshot->snap->anon_dev = 0;
869 btrfs_put_root(pending_snapshot->snap);
870 btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv);
871free_pending:
872 if (pending_snapshot->anon_dev)
873 free_anon_bdev(pending_snapshot->anon_dev);
874 kfree(pending_snapshot->root_item);
875 btrfs_free_path(pending_snapshot->path);
876 kfree(pending_snapshot);
877
878 return ret;
879}
880
881/* copy of may_delete in fs/namei.c()
882 * Check whether we can remove a link victim from directory dir, check
883 * whether the type of victim is right.
884 * 1. We can't do it if dir is read-only (done in permission())
885 * 2. We should have write and exec permissions on dir
886 * 3. We can't remove anything from append-only dir
887 * 4. We can't do anything with immutable dir (done in permission())
888 * 5. If the sticky bit on dir is set we should either
889 * a. be owner of dir, or
890 * b. be owner of victim, or
891 * c. have CAP_FOWNER capability
892 * 6. If the victim is append-only or immutable we can't do anything with
893 * links pointing to it.
894 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
895 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
896 * 9. We can't remove a root or mountpoint.
897 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
898 * nfs_async_unlink().
899 */
900
901static int btrfs_may_delete(struct user_namespace *mnt_userns,
902 struct inode *dir, struct dentry *victim, int isdir)
903{
904 int error;
905
906 if (d_really_is_negative(victim))
907 return -ENOENT;
908
909 BUG_ON(d_inode(victim->d_parent) != dir);
910 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
911
912 error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
913 if (error)
914 return error;
915 if (IS_APPEND(dir))
916 return -EPERM;
917 if (check_sticky(mnt_userns, dir, d_inode(victim)) ||
918 IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
919 IS_SWAPFILE(d_inode(victim)))
920 return -EPERM;
921 if (isdir) {
922 if (!d_is_dir(victim))
923 return -ENOTDIR;
924 if (IS_ROOT(victim))
925 return -EBUSY;
926 } else if (d_is_dir(victim))
927 return -EISDIR;
928 if (IS_DEADDIR(dir))
929 return -ENOENT;
930 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
931 return -EBUSY;
932 return 0;
933}
934
935/* copy of may_create in fs/namei.c() */
936static inline int btrfs_may_create(struct user_namespace *mnt_userns,
937 struct inode *dir, struct dentry *child)
938{
939 if (d_really_is_positive(child))
940 return -EEXIST;
941 if (IS_DEADDIR(dir))
942 return -ENOENT;
943 if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns))
944 return -EOVERFLOW;
945 return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
946}
947
948/*
949 * Create a new subvolume below @parent. This is largely modeled after
950 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
951 * inside this filesystem so it's quite a bit simpler.
952 */
953static noinline int btrfs_mksubvol(const struct path *parent,
954 struct user_namespace *mnt_userns,
955 const char *name, int namelen,
956 struct btrfs_root *snap_src,
957 bool readonly,
958 struct btrfs_qgroup_inherit *inherit)
959{
960 struct inode *dir = d_inode(parent->dentry);
961 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
962 struct dentry *dentry;
963 struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen);
964 int error;
965
966 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
967 if (error == -EINTR)
968 return error;
969
970 dentry = lookup_one(mnt_userns, name, parent->dentry, namelen);
971 error = PTR_ERR(dentry);
972 if (IS_ERR(dentry))
973 goto out_unlock;
974
975 error = btrfs_may_create(mnt_userns, dir, dentry);
976 if (error)
977 goto out_dput;
978
979 /*
980 * even if this name doesn't exist, we may get hash collisions.
981 * check for them now when we can safely fail
982 */
983 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
984 dir->i_ino, &name_str);
985 if (error)
986 goto out_dput;
987
988 down_read(&fs_info->subvol_sem);
989
990 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
991 goto out_up_read;
992
993 if (snap_src)
994 error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
995 else
996 error = create_subvol(mnt_userns, dir, dentry, inherit);
997
998 if (!error)
999 fsnotify_mkdir(dir, dentry);
1000out_up_read:
1001 up_read(&fs_info->subvol_sem);
1002out_dput:
1003 dput(dentry);
1004out_unlock:
1005 btrfs_inode_unlock(BTRFS_I(dir), 0);
1006 return error;
1007}
1008
1009static noinline int btrfs_mksnapshot(const struct path *parent,
1010 struct user_namespace *mnt_userns,
1011 const char *name, int namelen,
1012 struct btrfs_root *root,
1013 bool readonly,
1014 struct btrfs_qgroup_inherit *inherit)
1015{
1016 int ret;
1017 bool snapshot_force_cow = false;
1018
1019 /*
1020 * Force new buffered writes to reserve space even when NOCOW is
1021 * possible. This is to avoid later writeback (running dealloc) to
1022 * fallback to COW mode and unexpectedly fail with ENOSPC.
1023 */
1024 btrfs_drew_read_lock(&root->snapshot_lock);
1025
1026 ret = btrfs_start_delalloc_snapshot(root, false);
1027 if (ret)
1028 goto out;
1029
1030 /*
1031 * All previous writes have started writeback in NOCOW mode, so now
1032 * we force future writes to fallback to COW mode during snapshot
1033 * creation.
1034 */
1035 atomic_inc(&root->snapshot_force_cow);
1036 snapshot_force_cow = true;
1037
1038 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
1039
1040 ret = btrfs_mksubvol(parent, mnt_userns, name, namelen,
1041 root, readonly, inherit);
1042out:
1043 if (snapshot_force_cow)
1044 atomic_dec(&root->snapshot_force_cow);
1045 btrfs_drew_read_unlock(&root->snapshot_lock);
1046 return ret;
1047}
1048
1049/*
1050 * Try to start exclusive operation @type or cancel it if it's running.
1051 *
1052 * Return:
1053 * 0 - normal mode, newly claimed op started
1054 * >0 - normal mode, something else is running,
1055 * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space
1056 * ECANCELED - cancel mode, successful cancel
1057 * ENOTCONN - cancel mode, operation not running anymore
1058 */
1059static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info,
1060 enum btrfs_exclusive_operation type, bool cancel)
1061{
1062 if (!cancel) {
1063 /* Start normal op */
1064 if (!btrfs_exclop_start(fs_info, type))
1065 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1066 /* Exclusive operation is now claimed */
1067 return 0;
1068 }
1069
1070 /* Cancel running op */
1071 if (btrfs_exclop_start_try_lock(fs_info, type)) {
1072 /*
1073 * This blocks any exclop finish from setting it to NONE, so we
1074 * request cancellation. Either it runs and we will wait for it,
1075 * or it has finished and no waiting will happen.
1076 */
1077 atomic_inc(&fs_info->reloc_cancel_req);
1078 btrfs_exclop_start_unlock(fs_info);
1079
1080 if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags))
1081 wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING,
1082 TASK_INTERRUPTIBLE);
1083
1084 return -ECANCELED;
1085 }
1086
1087 /* Something else is running or none */
1088 return -ENOTCONN;
1089}
1090
1091static noinline int btrfs_ioctl_resize(struct file *file,
1092 void __user *arg)
1093{
1094 BTRFS_DEV_LOOKUP_ARGS(args);
1095 struct inode *inode = file_inode(file);
1096 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1097 u64 new_size;
1098 u64 old_size;
1099 u64 devid = 1;
1100 struct btrfs_root *root = BTRFS_I(inode)->root;
1101 struct btrfs_ioctl_vol_args *vol_args;
1102 struct btrfs_trans_handle *trans;
1103 struct btrfs_device *device = NULL;
1104 char *sizestr;
1105 char *retptr;
1106 char *devstr = NULL;
1107 int ret = 0;
1108 int mod = 0;
1109 bool cancel;
1110
1111 if (!capable(CAP_SYS_ADMIN))
1112 return -EPERM;
1113
1114 ret = mnt_want_write_file(file);
1115 if (ret)
1116 return ret;
1117
1118 /*
1119 * Read the arguments before checking exclusivity to be able to
1120 * distinguish regular resize and cancel
1121 */
1122 vol_args = memdup_user(arg, sizeof(*vol_args));
1123 if (IS_ERR(vol_args)) {
1124 ret = PTR_ERR(vol_args);
1125 goto out_drop;
1126 }
1127 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1128 sizestr = vol_args->name;
1129 cancel = (strcmp("cancel", sizestr) == 0);
1130 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel);
1131 if (ret)
1132 goto out_free;
1133 /* Exclusive operation is now claimed */
1134
1135 devstr = strchr(sizestr, ':');
1136 if (devstr) {
1137 sizestr = devstr + 1;
1138 *devstr = '\0';
1139 devstr = vol_args->name;
1140 ret = kstrtoull(devstr, 10, &devid);
1141 if (ret)
1142 goto out_finish;
1143 if (!devid) {
1144 ret = -EINVAL;
1145 goto out_finish;
1146 }
1147 btrfs_info(fs_info, "resizing devid %llu", devid);
1148 }
1149
1150 args.devid = devid;
1151 device = btrfs_find_device(fs_info->fs_devices, &args);
1152 if (!device) {
1153 btrfs_info(fs_info, "resizer unable to find device %llu",
1154 devid);
1155 ret = -ENODEV;
1156 goto out_finish;
1157 }
1158
1159 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1160 btrfs_info(fs_info,
1161 "resizer unable to apply on readonly device %llu",
1162 devid);
1163 ret = -EPERM;
1164 goto out_finish;
1165 }
1166
1167 if (!strcmp(sizestr, "max"))
1168 new_size = bdev_nr_bytes(device->bdev);
1169 else {
1170 if (sizestr[0] == '-') {
1171 mod = -1;
1172 sizestr++;
1173 } else if (sizestr[0] == '+') {
1174 mod = 1;
1175 sizestr++;
1176 }
1177 new_size = memparse(sizestr, &retptr);
1178 if (*retptr != '\0' || new_size == 0) {
1179 ret = -EINVAL;
1180 goto out_finish;
1181 }
1182 }
1183
1184 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1185 ret = -EPERM;
1186 goto out_finish;
1187 }
1188
1189 old_size = btrfs_device_get_total_bytes(device);
1190
1191 if (mod < 0) {
1192 if (new_size > old_size) {
1193 ret = -EINVAL;
1194 goto out_finish;
1195 }
1196 new_size = old_size - new_size;
1197 } else if (mod > 0) {
1198 if (new_size > ULLONG_MAX - old_size) {
1199 ret = -ERANGE;
1200 goto out_finish;
1201 }
1202 new_size = old_size + new_size;
1203 }
1204
1205 if (new_size < SZ_256M) {
1206 ret = -EINVAL;
1207 goto out_finish;
1208 }
1209 if (new_size > bdev_nr_bytes(device->bdev)) {
1210 ret = -EFBIG;
1211 goto out_finish;
1212 }
1213
1214 new_size = round_down(new_size, fs_info->sectorsize);
1215
1216 if (new_size > old_size) {
1217 trans = btrfs_start_transaction(root, 0);
1218 if (IS_ERR(trans)) {
1219 ret = PTR_ERR(trans);
1220 goto out_finish;
1221 }
1222 ret = btrfs_grow_device(trans, device, new_size);
1223 btrfs_commit_transaction(trans);
1224 } else if (new_size < old_size) {
1225 ret = btrfs_shrink_device(device, new_size);
1226 } /* equal, nothing need to do */
1227
1228 if (ret == 0 && new_size != old_size)
1229 btrfs_info_in_rcu(fs_info,
1230 "resize device %s (devid %llu) from %llu to %llu",
1231 btrfs_dev_name(device), device->devid,
1232 old_size, new_size);
1233out_finish:
1234 btrfs_exclop_finish(fs_info);
1235out_free:
1236 kfree(vol_args);
1237out_drop:
1238 mnt_drop_write_file(file);
1239 return ret;
1240}
1241
1242static noinline int __btrfs_ioctl_snap_create(struct file *file,
1243 struct user_namespace *mnt_userns,
1244 const char *name, unsigned long fd, int subvol,
1245 bool readonly,
1246 struct btrfs_qgroup_inherit *inherit)
1247{
1248 int namelen;
1249 int ret = 0;
1250
1251 if (!S_ISDIR(file_inode(file)->i_mode))
1252 return -ENOTDIR;
1253
1254 ret = mnt_want_write_file(file);
1255 if (ret)
1256 goto out;
1257
1258 namelen = strlen(name);
1259 if (strchr(name, '/')) {
1260 ret = -EINVAL;
1261 goto out_drop_write;
1262 }
1263
1264 if (name[0] == '.' &&
1265 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1266 ret = -EEXIST;
1267 goto out_drop_write;
1268 }
1269
1270 if (subvol) {
1271 ret = btrfs_mksubvol(&file->f_path, mnt_userns, name,
1272 namelen, NULL, readonly, inherit);
1273 } else {
1274 struct fd src = fdget(fd);
1275 struct inode *src_inode;
1276 if (!src.file) {
1277 ret = -EINVAL;
1278 goto out_drop_write;
1279 }
1280
1281 src_inode = file_inode(src.file);
1282 if (src_inode->i_sb != file_inode(file)->i_sb) {
1283 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1284 "Snapshot src from another FS");
1285 ret = -EXDEV;
1286 } else if (!inode_owner_or_capable(mnt_userns, src_inode)) {
1287 /*
1288 * Subvolume creation is not restricted, but snapshots
1289 * are limited to own subvolumes only
1290 */
1291 ret = -EPERM;
1292 } else {
1293 ret = btrfs_mksnapshot(&file->f_path, mnt_userns,
1294 name, namelen,
1295 BTRFS_I(src_inode)->root,
1296 readonly, inherit);
1297 }
1298 fdput(src);
1299 }
1300out_drop_write:
1301 mnt_drop_write_file(file);
1302out:
1303 return ret;
1304}
1305
1306static noinline int btrfs_ioctl_snap_create(struct file *file,
1307 void __user *arg, int subvol)
1308{
1309 struct btrfs_ioctl_vol_args *vol_args;
1310 int ret;
1311
1312 if (!S_ISDIR(file_inode(file)->i_mode))
1313 return -ENOTDIR;
1314
1315 vol_args = memdup_user(arg, sizeof(*vol_args));
1316 if (IS_ERR(vol_args))
1317 return PTR_ERR(vol_args);
1318 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1319
1320 ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file),
1321 vol_args->name, vol_args->fd, subvol,
1322 false, NULL);
1323
1324 kfree(vol_args);
1325 return ret;
1326}
1327
1328static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1329 void __user *arg, int subvol)
1330{
1331 struct btrfs_ioctl_vol_args_v2 *vol_args;
1332 int ret;
1333 bool readonly = false;
1334 struct btrfs_qgroup_inherit *inherit = NULL;
1335
1336 if (!S_ISDIR(file_inode(file)->i_mode))
1337 return -ENOTDIR;
1338
1339 vol_args = memdup_user(arg, sizeof(*vol_args));
1340 if (IS_ERR(vol_args))
1341 return PTR_ERR(vol_args);
1342 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1343
1344 if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
1345 ret = -EOPNOTSUPP;
1346 goto free_args;
1347 }
1348
1349 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1350 readonly = true;
1351 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1352 u64 nums;
1353
1354 if (vol_args->size < sizeof(*inherit) ||
1355 vol_args->size > PAGE_SIZE) {
1356 ret = -EINVAL;
1357 goto free_args;
1358 }
1359 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1360 if (IS_ERR(inherit)) {
1361 ret = PTR_ERR(inherit);
1362 goto free_args;
1363 }
1364
1365 if (inherit->num_qgroups > PAGE_SIZE ||
1366 inherit->num_ref_copies > PAGE_SIZE ||
1367 inherit->num_excl_copies > PAGE_SIZE) {
1368 ret = -EINVAL;
1369 goto free_inherit;
1370 }
1371
1372 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
1373 2 * inherit->num_excl_copies;
1374 if (vol_args->size != struct_size(inherit, qgroups, nums)) {
1375 ret = -EINVAL;
1376 goto free_inherit;
1377 }
1378 }
1379
1380 ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file),
1381 vol_args->name, vol_args->fd, subvol,
1382 readonly, inherit);
1383 if (ret)
1384 goto free_inherit;
1385free_inherit:
1386 kfree(inherit);
1387free_args:
1388 kfree(vol_args);
1389 return ret;
1390}
1391
1392static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode,
1393 void __user *arg)
1394{
1395 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1396 struct btrfs_root *root = BTRFS_I(inode)->root;
1397 int ret = 0;
1398 u64 flags = 0;
1399
1400 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1401 return -EINVAL;
1402
1403 down_read(&fs_info->subvol_sem);
1404 if (btrfs_root_readonly(root))
1405 flags |= BTRFS_SUBVOL_RDONLY;
1406 up_read(&fs_info->subvol_sem);
1407
1408 if (copy_to_user(arg, &flags, sizeof(flags)))
1409 ret = -EFAULT;
1410
1411 return ret;
1412}
1413
1414static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1415 void __user *arg)
1416{
1417 struct inode *inode = file_inode(file);
1418 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1419 struct btrfs_root *root = BTRFS_I(inode)->root;
1420 struct btrfs_trans_handle *trans;
1421 u64 root_flags;
1422 u64 flags;
1423 int ret = 0;
1424
1425 if (!inode_owner_or_capable(file_mnt_user_ns(file), inode))
1426 return -EPERM;
1427
1428 ret = mnt_want_write_file(file);
1429 if (ret)
1430 goto out;
1431
1432 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1433 ret = -EINVAL;
1434 goto out_drop_write;
1435 }
1436
1437 if (copy_from_user(&flags, arg, sizeof(flags))) {
1438 ret = -EFAULT;
1439 goto out_drop_write;
1440 }
1441
1442 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1443 ret = -EOPNOTSUPP;
1444 goto out_drop_write;
1445 }
1446
1447 down_write(&fs_info->subvol_sem);
1448
1449 /* nothing to do */
1450 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1451 goto out_drop_sem;
1452
1453 root_flags = btrfs_root_flags(&root->root_item);
1454 if (flags & BTRFS_SUBVOL_RDONLY) {
1455 btrfs_set_root_flags(&root->root_item,
1456 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1457 } else {
1458 /*
1459 * Block RO -> RW transition if this subvolume is involved in
1460 * send
1461 */
1462 spin_lock(&root->root_item_lock);
1463 if (root->send_in_progress == 0) {
1464 btrfs_set_root_flags(&root->root_item,
1465 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1466 spin_unlock(&root->root_item_lock);
1467 } else {
1468 spin_unlock(&root->root_item_lock);
1469 btrfs_warn(fs_info,
1470 "Attempt to set subvolume %llu read-write during send",
1471 root->root_key.objectid);
1472 ret = -EPERM;
1473 goto out_drop_sem;
1474 }
1475 }
1476
1477 trans = btrfs_start_transaction(root, 1);
1478 if (IS_ERR(trans)) {
1479 ret = PTR_ERR(trans);
1480 goto out_reset;
1481 }
1482
1483 ret = btrfs_update_root(trans, fs_info->tree_root,
1484 &root->root_key, &root->root_item);
1485 if (ret < 0) {
1486 btrfs_end_transaction(trans);
1487 goto out_reset;
1488 }
1489
1490 ret = btrfs_commit_transaction(trans);
1491
1492out_reset:
1493 if (ret)
1494 btrfs_set_root_flags(&root->root_item, root_flags);
1495out_drop_sem:
1496 up_write(&fs_info->subvol_sem);
1497out_drop_write:
1498 mnt_drop_write_file(file);
1499out:
1500 return ret;
1501}
1502
1503static noinline int key_in_sk(struct btrfs_key *key,
1504 struct btrfs_ioctl_search_key *sk)
1505{
1506 struct btrfs_key test;
1507 int ret;
1508
1509 test.objectid = sk->min_objectid;
1510 test.type = sk->min_type;
1511 test.offset = sk->min_offset;
1512
1513 ret = btrfs_comp_cpu_keys(key, &test);
1514 if (ret < 0)
1515 return 0;
1516
1517 test.objectid = sk->max_objectid;
1518 test.type = sk->max_type;
1519 test.offset = sk->max_offset;
1520
1521 ret = btrfs_comp_cpu_keys(key, &test);
1522 if (ret > 0)
1523 return 0;
1524 return 1;
1525}
1526
1527static noinline int copy_to_sk(struct btrfs_path *path,
1528 struct btrfs_key *key,
1529 struct btrfs_ioctl_search_key *sk,
1530 size_t *buf_size,
1531 char __user *ubuf,
1532 unsigned long *sk_offset,
1533 int *num_found)
1534{
1535 u64 found_transid;
1536 struct extent_buffer *leaf;
1537 struct btrfs_ioctl_search_header sh;
1538 struct btrfs_key test;
1539 unsigned long item_off;
1540 unsigned long item_len;
1541 int nritems;
1542 int i;
1543 int slot;
1544 int ret = 0;
1545
1546 leaf = path->nodes[0];
1547 slot = path->slots[0];
1548 nritems = btrfs_header_nritems(leaf);
1549
1550 if (btrfs_header_generation(leaf) > sk->max_transid) {
1551 i = nritems;
1552 goto advance_key;
1553 }
1554 found_transid = btrfs_header_generation(leaf);
1555
1556 for (i = slot; i < nritems; i++) {
1557 item_off = btrfs_item_ptr_offset(leaf, i);
1558 item_len = btrfs_item_size(leaf, i);
1559
1560 btrfs_item_key_to_cpu(leaf, key, i);
1561 if (!key_in_sk(key, sk))
1562 continue;
1563
1564 if (sizeof(sh) + item_len > *buf_size) {
1565 if (*num_found) {
1566 ret = 1;
1567 goto out;
1568 }
1569
1570 /*
1571 * return one empty item back for v1, which does not
1572 * handle -EOVERFLOW
1573 */
1574
1575 *buf_size = sizeof(sh) + item_len;
1576 item_len = 0;
1577 ret = -EOVERFLOW;
1578 }
1579
1580 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1581 ret = 1;
1582 goto out;
1583 }
1584
1585 sh.objectid = key->objectid;
1586 sh.offset = key->offset;
1587 sh.type = key->type;
1588 sh.len = item_len;
1589 sh.transid = found_transid;
1590
1591 /*
1592 * Copy search result header. If we fault then loop again so we
1593 * can fault in the pages and -EFAULT there if there's a
1594 * problem. Otherwise we'll fault and then copy the buffer in
1595 * properly this next time through
1596 */
1597 if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
1598 ret = 0;
1599 goto out;
1600 }
1601
1602 *sk_offset += sizeof(sh);
1603
1604 if (item_len) {
1605 char __user *up = ubuf + *sk_offset;
1606 /*
1607 * Copy the item, same behavior as above, but reset the
1608 * * sk_offset so we copy the full thing again.
1609 */
1610 if (read_extent_buffer_to_user_nofault(leaf, up,
1611 item_off, item_len)) {
1612 ret = 0;
1613 *sk_offset -= sizeof(sh);
1614 goto out;
1615 }
1616
1617 *sk_offset += item_len;
1618 }
1619 (*num_found)++;
1620
1621 if (ret) /* -EOVERFLOW from above */
1622 goto out;
1623
1624 if (*num_found >= sk->nr_items) {
1625 ret = 1;
1626 goto out;
1627 }
1628 }
1629advance_key:
1630 ret = 0;
1631 test.objectid = sk->max_objectid;
1632 test.type = sk->max_type;
1633 test.offset = sk->max_offset;
1634 if (btrfs_comp_cpu_keys(key, &test) >= 0)
1635 ret = 1;
1636 else if (key->offset < (u64)-1)
1637 key->offset++;
1638 else if (key->type < (u8)-1) {
1639 key->offset = 0;
1640 key->type++;
1641 } else if (key->objectid < (u64)-1) {
1642 key->offset = 0;
1643 key->type = 0;
1644 key->objectid++;
1645 } else
1646 ret = 1;
1647out:
1648 /*
1649 * 0: all items from this leaf copied, continue with next
1650 * 1: * more items can be copied, but unused buffer is too small
1651 * * all items were found
1652 * Either way, it will stops the loop which iterates to the next
1653 * leaf
1654 * -EOVERFLOW: item was to large for buffer
1655 * -EFAULT: could not copy extent buffer back to userspace
1656 */
1657 return ret;
1658}
1659
1660static noinline int search_ioctl(struct inode *inode,
1661 struct btrfs_ioctl_search_key *sk,
1662 size_t *buf_size,
1663 char __user *ubuf)
1664{
1665 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
1666 struct btrfs_root *root;
1667 struct btrfs_key key;
1668 struct btrfs_path *path;
1669 int ret;
1670 int num_found = 0;
1671 unsigned long sk_offset = 0;
1672
1673 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
1674 *buf_size = sizeof(struct btrfs_ioctl_search_header);
1675 return -EOVERFLOW;
1676 }
1677
1678 path = btrfs_alloc_path();
1679 if (!path)
1680 return -ENOMEM;
1681
1682 if (sk->tree_id == 0) {
1683 /* search the root of the inode that was passed */
1684 root = btrfs_grab_root(BTRFS_I(inode)->root);
1685 } else {
1686 root = btrfs_get_fs_root(info, sk->tree_id, true);
1687 if (IS_ERR(root)) {
1688 btrfs_free_path(path);
1689 return PTR_ERR(root);
1690 }
1691 }
1692
1693 key.objectid = sk->min_objectid;
1694 key.type = sk->min_type;
1695 key.offset = sk->min_offset;
1696
1697 while (1) {
1698 ret = -EFAULT;
1699 /*
1700 * Ensure that the whole user buffer is faulted in at sub-page
1701 * granularity, otherwise the loop may live-lock.
1702 */
1703 if (fault_in_subpage_writeable(ubuf + sk_offset,
1704 *buf_size - sk_offset))
1705 break;
1706
1707 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
1708 if (ret != 0) {
1709 if (ret > 0)
1710 ret = 0;
1711 goto err;
1712 }
1713 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
1714 &sk_offset, &num_found);
1715 btrfs_release_path(path);
1716 if (ret)
1717 break;
1718
1719 }
1720 if (ret > 0)
1721 ret = 0;
1722err:
1723 sk->nr_items = num_found;
1724 btrfs_put_root(root);
1725 btrfs_free_path(path);
1726 return ret;
1727}
1728
1729static noinline int btrfs_ioctl_tree_search(struct inode *inode,
1730 void __user *argp)
1731{
1732 struct btrfs_ioctl_search_args __user *uargs = argp;
1733 struct btrfs_ioctl_search_key sk;
1734 int ret;
1735 size_t buf_size;
1736
1737 if (!capable(CAP_SYS_ADMIN))
1738 return -EPERM;
1739
1740 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
1741 return -EFAULT;
1742
1743 buf_size = sizeof(uargs->buf);
1744
1745 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
1746
1747 /*
1748 * In the origin implementation an overflow is handled by returning a
1749 * search header with a len of zero, so reset ret.
1750 */
1751 if (ret == -EOVERFLOW)
1752 ret = 0;
1753
1754 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
1755 ret = -EFAULT;
1756 return ret;
1757}
1758
1759static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode,
1760 void __user *argp)
1761{
1762 struct btrfs_ioctl_search_args_v2 __user *uarg = argp;
1763 struct btrfs_ioctl_search_args_v2 args;
1764 int ret;
1765 size_t buf_size;
1766 const size_t buf_limit = SZ_16M;
1767
1768 if (!capable(CAP_SYS_ADMIN))
1769 return -EPERM;
1770
1771 /* copy search header and buffer size */
1772 if (copy_from_user(&args, uarg, sizeof(args)))
1773 return -EFAULT;
1774
1775 buf_size = args.buf_size;
1776
1777 /* limit result size to 16MB */
1778 if (buf_size > buf_limit)
1779 buf_size = buf_limit;
1780
1781 ret = search_ioctl(inode, &args.key, &buf_size,
1782 (char __user *)(&uarg->buf[0]));
1783 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
1784 ret = -EFAULT;
1785 else if (ret == -EOVERFLOW &&
1786 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
1787 ret = -EFAULT;
1788
1789 return ret;
1790}
1791
1792/*
1793 * Search INODE_REFs to identify path name of 'dirid' directory
1794 * in a 'tree_id' tree. and sets path name to 'name'.
1795 */
1796static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1797 u64 tree_id, u64 dirid, char *name)
1798{
1799 struct btrfs_root *root;
1800 struct btrfs_key key;
1801 char *ptr;
1802 int ret = -1;
1803 int slot;
1804 int len;
1805 int total_len = 0;
1806 struct btrfs_inode_ref *iref;
1807 struct extent_buffer *l;
1808 struct btrfs_path *path;
1809
1810 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1811 name[0]='\0';
1812 return 0;
1813 }
1814
1815 path = btrfs_alloc_path();
1816 if (!path)
1817 return -ENOMEM;
1818
1819 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
1820
1821 root = btrfs_get_fs_root(info, tree_id, true);
1822 if (IS_ERR(root)) {
1823 ret = PTR_ERR(root);
1824 root = NULL;
1825 goto out;
1826 }
1827
1828 key.objectid = dirid;
1829 key.type = BTRFS_INODE_REF_KEY;
1830 key.offset = (u64)-1;
1831
1832 while (1) {
1833 ret = btrfs_search_backwards(root, &key, path);
1834 if (ret < 0)
1835 goto out;
1836 else if (ret > 0) {
1837 ret = -ENOENT;
1838 goto out;
1839 }
1840
1841 l = path->nodes[0];
1842 slot = path->slots[0];
1843
1844 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1845 len = btrfs_inode_ref_name_len(l, iref);
1846 ptr -= len + 1;
1847 total_len += len + 1;
1848 if (ptr < name) {
1849 ret = -ENAMETOOLONG;
1850 goto out;
1851 }
1852
1853 *(ptr + len) = '/';
1854 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
1855
1856 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1857 break;
1858
1859 btrfs_release_path(path);
1860 key.objectid = key.offset;
1861 key.offset = (u64)-1;
1862 dirid = key.objectid;
1863 }
1864 memmove(name, ptr, total_len);
1865 name[total_len] = '\0';
1866 ret = 0;
1867out:
1868 btrfs_put_root(root);
1869 btrfs_free_path(path);
1870 return ret;
1871}
1872
1873static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns,
1874 struct inode *inode,
1875 struct btrfs_ioctl_ino_lookup_user_args *args)
1876{
1877 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
1878 struct super_block *sb = inode->i_sb;
1879 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
1880 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
1881 u64 dirid = args->dirid;
1882 unsigned long item_off;
1883 unsigned long item_len;
1884 struct btrfs_inode_ref *iref;
1885 struct btrfs_root_ref *rref;
1886 struct btrfs_root *root = NULL;
1887 struct btrfs_path *path;
1888 struct btrfs_key key, key2;
1889 struct extent_buffer *leaf;
1890 struct inode *temp_inode;
1891 char *ptr;
1892 int slot;
1893 int len;
1894 int total_len = 0;
1895 int ret;
1896
1897 path = btrfs_alloc_path();
1898 if (!path)
1899 return -ENOMEM;
1900
1901 /*
1902 * If the bottom subvolume does not exist directly under upper_limit,
1903 * construct the path in from the bottom up.
1904 */
1905 if (dirid != upper_limit.objectid) {
1906 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
1907
1908 root = btrfs_get_fs_root(fs_info, treeid, true);
1909 if (IS_ERR(root)) {
1910 ret = PTR_ERR(root);
1911 goto out;
1912 }
1913
1914 key.objectid = dirid;
1915 key.type = BTRFS_INODE_REF_KEY;
1916 key.offset = (u64)-1;
1917 while (1) {
1918 ret = btrfs_search_backwards(root, &key, path);
1919 if (ret < 0)
1920 goto out_put;
1921 else if (ret > 0) {
1922 ret = -ENOENT;
1923 goto out_put;
1924 }
1925
1926 leaf = path->nodes[0];
1927 slot = path->slots[0];
1928
1929 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
1930 len = btrfs_inode_ref_name_len(leaf, iref);
1931 ptr -= len + 1;
1932 total_len += len + 1;
1933 if (ptr < args->path) {
1934 ret = -ENAMETOOLONG;
1935 goto out_put;
1936 }
1937
1938 *(ptr + len) = '/';
1939 read_extent_buffer(leaf, ptr,
1940 (unsigned long)(iref + 1), len);
1941
1942 /* Check the read+exec permission of this directory */
1943 ret = btrfs_previous_item(root, path, dirid,
1944 BTRFS_INODE_ITEM_KEY);
1945 if (ret < 0) {
1946 goto out_put;
1947 } else if (ret > 0) {
1948 ret = -ENOENT;
1949 goto out_put;
1950 }
1951
1952 leaf = path->nodes[0];
1953 slot = path->slots[0];
1954 btrfs_item_key_to_cpu(leaf, &key2, slot);
1955 if (key2.objectid != dirid) {
1956 ret = -ENOENT;
1957 goto out_put;
1958 }
1959
1960 temp_inode = btrfs_iget(sb, key2.objectid, root);
1961 if (IS_ERR(temp_inode)) {
1962 ret = PTR_ERR(temp_inode);
1963 goto out_put;
1964 }
1965 ret = inode_permission(mnt_userns, temp_inode,
1966 MAY_READ | MAY_EXEC);
1967 iput(temp_inode);
1968 if (ret) {
1969 ret = -EACCES;
1970 goto out_put;
1971 }
1972
1973 if (key.offset == upper_limit.objectid)
1974 break;
1975 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
1976 ret = -EACCES;
1977 goto out_put;
1978 }
1979
1980 btrfs_release_path(path);
1981 key.objectid = key.offset;
1982 key.offset = (u64)-1;
1983 dirid = key.objectid;
1984 }
1985
1986 memmove(args->path, ptr, total_len);
1987 args->path[total_len] = '\0';
1988 btrfs_put_root(root);
1989 root = NULL;
1990 btrfs_release_path(path);
1991 }
1992
1993 /* Get the bottom subvolume's name from ROOT_REF */
1994 key.objectid = treeid;
1995 key.type = BTRFS_ROOT_REF_KEY;
1996 key.offset = args->treeid;
1997 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1998 if (ret < 0) {
1999 goto out;
2000 } else if (ret > 0) {
2001 ret = -ENOENT;
2002 goto out;
2003 }
2004
2005 leaf = path->nodes[0];
2006 slot = path->slots[0];
2007 btrfs_item_key_to_cpu(leaf, &key, slot);
2008
2009 item_off = btrfs_item_ptr_offset(leaf, slot);
2010 item_len = btrfs_item_size(leaf, slot);
2011 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2012 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2013 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2014 ret = -EINVAL;
2015 goto out;
2016 }
2017
2018 /* Copy subvolume's name */
2019 item_off += sizeof(struct btrfs_root_ref);
2020 item_len -= sizeof(struct btrfs_root_ref);
2021 read_extent_buffer(leaf, args->name, item_off, item_len);
2022 args->name[item_len] = 0;
2023
2024out_put:
2025 btrfs_put_root(root);
2026out:
2027 btrfs_free_path(path);
2028 return ret;
2029}
2030
2031static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root,
2032 void __user *argp)
2033{
2034 struct btrfs_ioctl_ino_lookup_args *args;
2035 int ret = 0;
2036
2037 args = memdup_user(argp, sizeof(*args));
2038 if (IS_ERR(args))
2039 return PTR_ERR(args);
2040
2041 /*
2042 * Unprivileged query to obtain the containing subvolume root id. The
2043 * path is reset so it's consistent with btrfs_search_path_in_tree.
2044 */
2045 if (args->treeid == 0)
2046 args->treeid = root->root_key.objectid;
2047
2048 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2049 args->name[0] = 0;
2050 goto out;
2051 }
2052
2053 if (!capable(CAP_SYS_ADMIN)) {
2054 ret = -EPERM;
2055 goto out;
2056 }
2057
2058 ret = btrfs_search_path_in_tree(root->fs_info,
2059 args->treeid, args->objectid,
2060 args->name);
2061
2062out:
2063 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2064 ret = -EFAULT;
2065
2066 kfree(args);
2067 return ret;
2068}
2069
2070/*
2071 * Version of ino_lookup ioctl (unprivileged)
2072 *
2073 * The main differences from ino_lookup ioctl are:
2074 *
2075 * 1. Read + Exec permission will be checked using inode_permission() during
2076 * path construction. -EACCES will be returned in case of failure.
2077 * 2. Path construction will be stopped at the inode number which corresponds
2078 * to the fd with which this ioctl is called. If constructed path does not
2079 * exist under fd's inode, -EACCES will be returned.
2080 * 3. The name of bottom subvolume is also searched and filled.
2081 */
2082static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2083{
2084 struct btrfs_ioctl_ino_lookup_user_args *args;
2085 struct inode *inode;
2086 int ret;
2087
2088 args = memdup_user(argp, sizeof(*args));
2089 if (IS_ERR(args))
2090 return PTR_ERR(args);
2091
2092 inode = file_inode(file);
2093
2094 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2095 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2096 /*
2097 * The subvolume does not exist under fd with which this is
2098 * called
2099 */
2100 kfree(args);
2101 return -EACCES;
2102 }
2103
2104 ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args);
2105
2106 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2107 ret = -EFAULT;
2108
2109 kfree(args);
2110 return ret;
2111}
2112
2113/* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2114static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp)
2115{
2116 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2117 struct btrfs_fs_info *fs_info;
2118 struct btrfs_root *root;
2119 struct btrfs_path *path;
2120 struct btrfs_key key;
2121 struct btrfs_root_item *root_item;
2122 struct btrfs_root_ref *rref;
2123 struct extent_buffer *leaf;
2124 unsigned long item_off;
2125 unsigned long item_len;
2126 int slot;
2127 int ret = 0;
2128
2129 path = btrfs_alloc_path();
2130 if (!path)
2131 return -ENOMEM;
2132
2133 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2134 if (!subvol_info) {
2135 btrfs_free_path(path);
2136 return -ENOMEM;
2137 }
2138
2139 fs_info = BTRFS_I(inode)->root->fs_info;
2140
2141 /* Get root_item of inode's subvolume */
2142 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2143 root = btrfs_get_fs_root(fs_info, key.objectid, true);
2144 if (IS_ERR(root)) {
2145 ret = PTR_ERR(root);
2146 goto out_free;
2147 }
2148 root_item = &root->root_item;
2149
2150 subvol_info->treeid = key.objectid;
2151
2152 subvol_info->generation = btrfs_root_generation(root_item);
2153 subvol_info->flags = btrfs_root_flags(root_item);
2154
2155 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2156 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2157 BTRFS_UUID_SIZE);
2158 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2159 BTRFS_UUID_SIZE);
2160
2161 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2162 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2163 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2164
2165 subvol_info->otransid = btrfs_root_otransid(root_item);
2166 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2167 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2168
2169 subvol_info->stransid = btrfs_root_stransid(root_item);
2170 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2171 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2172
2173 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2174 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2175 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2176
2177 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2178 /* Search root tree for ROOT_BACKREF of this subvolume */
2179 key.type = BTRFS_ROOT_BACKREF_KEY;
2180 key.offset = 0;
2181 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2182 if (ret < 0) {
2183 goto out;
2184 } else if (path->slots[0] >=
2185 btrfs_header_nritems(path->nodes[0])) {
2186 ret = btrfs_next_leaf(fs_info->tree_root, path);
2187 if (ret < 0) {
2188 goto out;
2189 } else if (ret > 0) {
2190 ret = -EUCLEAN;
2191 goto out;
2192 }
2193 }
2194
2195 leaf = path->nodes[0];
2196 slot = path->slots[0];
2197 btrfs_item_key_to_cpu(leaf, &key, slot);
2198 if (key.objectid == subvol_info->treeid &&
2199 key.type == BTRFS_ROOT_BACKREF_KEY) {
2200 subvol_info->parent_id = key.offset;
2201
2202 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2203 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2204
2205 item_off = btrfs_item_ptr_offset(leaf, slot)
2206 + sizeof(struct btrfs_root_ref);
2207 item_len = btrfs_item_size(leaf, slot)
2208 - sizeof(struct btrfs_root_ref);
2209 read_extent_buffer(leaf, subvol_info->name,
2210 item_off, item_len);
2211 } else {
2212 ret = -ENOENT;
2213 goto out;
2214 }
2215 }
2216
2217 btrfs_free_path(path);
2218 path = NULL;
2219 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2220 ret = -EFAULT;
2221
2222out:
2223 btrfs_put_root(root);
2224out_free:
2225 btrfs_free_path(path);
2226 kfree(subvol_info);
2227 return ret;
2228}
2229
2230/*
2231 * Return ROOT_REF information of the subvolume containing this inode
2232 * except the subvolume name.
2233 */
2234static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root,
2235 void __user *argp)
2236{
2237 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2238 struct btrfs_root_ref *rref;
2239 struct btrfs_path *path;
2240 struct btrfs_key key;
2241 struct extent_buffer *leaf;
2242 u64 objectid;
2243 int slot;
2244 int ret;
2245 u8 found;
2246
2247 path = btrfs_alloc_path();
2248 if (!path)
2249 return -ENOMEM;
2250
2251 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2252 if (IS_ERR(rootrefs)) {
2253 btrfs_free_path(path);
2254 return PTR_ERR(rootrefs);
2255 }
2256
2257 objectid = root->root_key.objectid;
2258 key.objectid = objectid;
2259 key.type = BTRFS_ROOT_REF_KEY;
2260 key.offset = rootrefs->min_treeid;
2261 found = 0;
2262
2263 root = root->fs_info->tree_root;
2264 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2265 if (ret < 0) {
2266 goto out;
2267 } else if (path->slots[0] >=
2268 btrfs_header_nritems(path->nodes[0])) {
2269 ret = btrfs_next_leaf(root, path);
2270 if (ret < 0) {
2271 goto out;
2272 } else if (ret > 0) {
2273 ret = -EUCLEAN;
2274 goto out;
2275 }
2276 }
2277 while (1) {
2278 leaf = path->nodes[0];
2279 slot = path->slots[0];
2280
2281 btrfs_item_key_to_cpu(leaf, &key, slot);
2282 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2283 ret = 0;
2284 goto out;
2285 }
2286
2287 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2288 ret = -EOVERFLOW;
2289 goto out;
2290 }
2291
2292 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2293 rootrefs->rootref[found].treeid = key.offset;
2294 rootrefs->rootref[found].dirid =
2295 btrfs_root_ref_dirid(leaf, rref);
2296 found++;
2297
2298 ret = btrfs_next_item(root, path);
2299 if (ret < 0) {
2300 goto out;
2301 } else if (ret > 0) {
2302 ret = -EUCLEAN;
2303 goto out;
2304 }
2305 }
2306
2307out:
2308 btrfs_free_path(path);
2309
2310 if (!ret || ret == -EOVERFLOW) {
2311 rootrefs->num_items = found;
2312 /* update min_treeid for next search */
2313 if (found)
2314 rootrefs->min_treeid =
2315 rootrefs->rootref[found - 1].treeid + 1;
2316 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2317 ret = -EFAULT;
2318 }
2319
2320 kfree(rootrefs);
2321
2322 return ret;
2323}
2324
2325static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2326 void __user *arg,
2327 bool destroy_v2)
2328{
2329 struct dentry *parent = file->f_path.dentry;
2330 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2331 struct dentry *dentry;
2332 struct inode *dir = d_inode(parent);
2333 struct inode *inode;
2334 struct btrfs_root *root = BTRFS_I(dir)->root;
2335 struct btrfs_root *dest = NULL;
2336 struct btrfs_ioctl_vol_args *vol_args = NULL;
2337 struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
2338 struct user_namespace *mnt_userns = file_mnt_user_ns(file);
2339 char *subvol_name, *subvol_name_ptr = NULL;
2340 int subvol_namelen;
2341 int err = 0;
2342 bool destroy_parent = false;
2343
2344 /* We don't support snapshots with extent tree v2 yet. */
2345 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2346 btrfs_err(fs_info,
2347 "extent tree v2 doesn't support snapshot deletion yet");
2348 return -EOPNOTSUPP;
2349 }
2350
2351 if (destroy_v2) {
2352 vol_args2 = memdup_user(arg, sizeof(*vol_args2));
2353 if (IS_ERR(vol_args2))
2354 return PTR_ERR(vol_args2);
2355
2356 if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
2357 err = -EOPNOTSUPP;
2358 goto out;
2359 }
2360
2361 /*
2362 * If SPEC_BY_ID is not set, we are looking for the subvolume by
2363 * name, same as v1 currently does.
2364 */
2365 if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
2366 vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0;
2367 subvol_name = vol_args2->name;
2368
2369 err = mnt_want_write_file(file);
2370 if (err)
2371 goto out;
2372 } else {
2373 struct inode *old_dir;
2374
2375 if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
2376 err = -EINVAL;
2377 goto out;
2378 }
2379
2380 err = mnt_want_write_file(file);
2381 if (err)
2382 goto out;
2383
2384 dentry = btrfs_get_dentry(fs_info->sb,
2385 BTRFS_FIRST_FREE_OBJECTID,
2386 vol_args2->subvolid, 0);
2387 if (IS_ERR(dentry)) {
2388 err = PTR_ERR(dentry);
2389 goto out_drop_write;
2390 }
2391
2392 /*
2393 * Change the default parent since the subvolume being
2394 * deleted can be outside of the current mount point.
2395 */
2396 parent = btrfs_get_parent(dentry);
2397
2398 /*
2399 * At this point dentry->d_name can point to '/' if the
2400 * subvolume we want to destroy is outsite of the
2401 * current mount point, so we need to release the
2402 * current dentry and execute the lookup to return a new
2403 * one with ->d_name pointing to the
2404 * <mount point>/subvol_name.
2405 */
2406 dput(dentry);
2407 if (IS_ERR(parent)) {
2408 err = PTR_ERR(parent);
2409 goto out_drop_write;
2410 }
2411 old_dir = dir;
2412 dir = d_inode(parent);
2413
2414 /*
2415 * If v2 was used with SPEC_BY_ID, a new parent was
2416 * allocated since the subvolume can be outside of the
2417 * current mount point. Later on we need to release this
2418 * new parent dentry.
2419 */
2420 destroy_parent = true;
2421
2422 /*
2423 * On idmapped mounts, deletion via subvolid is
2424 * restricted to subvolumes that are immediate
2425 * ancestors of the inode referenced by the file
2426 * descriptor in the ioctl. Otherwise the idmapping
2427 * could potentially be abused to delete subvolumes
2428 * anywhere in the filesystem the user wouldn't be able
2429 * to delete without an idmapped mount.
2430 */
2431 if (old_dir != dir && mnt_userns != &init_user_ns) {
2432 err = -EOPNOTSUPP;
2433 goto free_parent;
2434 }
2435
2436 subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
2437 fs_info, vol_args2->subvolid);
2438 if (IS_ERR(subvol_name_ptr)) {
2439 err = PTR_ERR(subvol_name_ptr);
2440 goto free_parent;
2441 }
2442 /* subvol_name_ptr is already nul terminated */
2443 subvol_name = (char *)kbasename(subvol_name_ptr);
2444 }
2445 } else {
2446 vol_args = memdup_user(arg, sizeof(*vol_args));
2447 if (IS_ERR(vol_args))
2448 return PTR_ERR(vol_args);
2449
2450 vol_args->name[BTRFS_PATH_NAME_MAX] = 0;
2451 subvol_name = vol_args->name;
2452
2453 err = mnt_want_write_file(file);
2454 if (err)
2455 goto out;
2456 }
2457
2458 subvol_namelen = strlen(subvol_name);
2459
2460 if (strchr(subvol_name, '/') ||
2461 strncmp(subvol_name, "..", subvol_namelen) == 0) {
2462 err = -EINVAL;
2463 goto free_subvol_name;
2464 }
2465
2466 if (!S_ISDIR(dir->i_mode)) {
2467 err = -ENOTDIR;
2468 goto free_subvol_name;
2469 }
2470
2471 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2472 if (err == -EINTR)
2473 goto free_subvol_name;
2474 dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen);
2475 if (IS_ERR(dentry)) {
2476 err = PTR_ERR(dentry);
2477 goto out_unlock_dir;
2478 }
2479
2480 if (d_really_is_negative(dentry)) {
2481 err = -ENOENT;
2482 goto out_dput;
2483 }
2484
2485 inode = d_inode(dentry);
2486 dest = BTRFS_I(inode)->root;
2487 if (!capable(CAP_SYS_ADMIN)) {
2488 /*
2489 * Regular user. Only allow this with a special mount
2490 * option, when the user has write+exec access to the
2491 * subvol root, and when rmdir(2) would have been
2492 * allowed.
2493 *
2494 * Note that this is _not_ check that the subvol is
2495 * empty or doesn't contain data that we wouldn't
2496 * otherwise be able to delete.
2497 *
2498 * Users who want to delete empty subvols should try
2499 * rmdir(2).
2500 */
2501 err = -EPERM;
2502 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2503 goto out_dput;
2504
2505 /*
2506 * Do not allow deletion if the parent dir is the same
2507 * as the dir to be deleted. That means the ioctl
2508 * must be called on the dentry referencing the root
2509 * of the subvol, not a random directory contained
2510 * within it.
2511 */
2512 err = -EINVAL;
2513 if (root == dest)
2514 goto out_dput;
2515
2516 err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC);
2517 if (err)
2518 goto out_dput;
2519 }
2520
2521 /* check if subvolume may be deleted by a user */
2522 err = btrfs_may_delete(mnt_userns, dir, dentry, 1);
2523 if (err)
2524 goto out_dput;
2525
2526 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2527 err = -EINVAL;
2528 goto out_dput;
2529 }
2530
2531 btrfs_inode_lock(BTRFS_I(inode), 0);
2532 err = btrfs_delete_subvolume(BTRFS_I(dir), dentry);
2533 btrfs_inode_unlock(BTRFS_I(inode), 0);
2534 if (!err)
2535 d_delete_notify(dir, dentry);
2536
2537out_dput:
2538 dput(dentry);
2539out_unlock_dir:
2540 btrfs_inode_unlock(BTRFS_I(dir), 0);
2541free_subvol_name:
2542 kfree(subvol_name_ptr);
2543free_parent:
2544 if (destroy_parent)
2545 dput(parent);
2546out_drop_write:
2547 mnt_drop_write_file(file);
2548out:
2549 kfree(vol_args2);
2550 kfree(vol_args);
2551 return err;
2552}
2553
2554static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2555{
2556 struct inode *inode = file_inode(file);
2557 struct btrfs_root *root = BTRFS_I(inode)->root;
2558 struct btrfs_ioctl_defrag_range_args range = {0};
2559 int ret;
2560
2561 ret = mnt_want_write_file(file);
2562 if (ret)
2563 return ret;
2564
2565 if (btrfs_root_readonly(root)) {
2566 ret = -EROFS;
2567 goto out;
2568 }
2569
2570 switch (inode->i_mode & S_IFMT) {
2571 case S_IFDIR:
2572 if (!capable(CAP_SYS_ADMIN)) {
2573 ret = -EPERM;
2574 goto out;
2575 }
2576 ret = btrfs_defrag_root(root);
2577 break;
2578 case S_IFREG:
2579 /*
2580 * Note that this does not check the file descriptor for write
2581 * access. This prevents defragmenting executables that are
2582 * running and allows defrag on files open in read-only mode.
2583 */
2584 if (!capable(CAP_SYS_ADMIN) &&
2585 inode_permission(&init_user_ns, inode, MAY_WRITE)) {
2586 ret = -EPERM;
2587 goto out;
2588 }
2589
2590 if (argp) {
2591 if (copy_from_user(&range, argp, sizeof(range))) {
2592 ret = -EFAULT;
2593 goto out;
2594 }
2595 /* compression requires us to start the IO */
2596 if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2597 range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
2598 range.extent_thresh = (u32)-1;
2599 }
2600 } else {
2601 /* the rest are all set to zero by kzalloc */
2602 range.len = (u64)-1;
2603 }
2604 ret = btrfs_defrag_file(file_inode(file), &file->f_ra,
2605 &range, BTRFS_OLDEST_GENERATION, 0);
2606 if (ret > 0)
2607 ret = 0;
2608 break;
2609 default:
2610 ret = -EINVAL;
2611 }
2612out:
2613 mnt_drop_write_file(file);
2614 return ret;
2615}
2616
2617static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
2618{
2619 struct btrfs_ioctl_vol_args *vol_args;
2620 bool restore_op = false;
2621 int ret;
2622
2623 if (!capable(CAP_SYS_ADMIN))
2624 return -EPERM;
2625
2626 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2627 btrfs_err(fs_info, "device add not supported on extent tree v2 yet");
2628 return -EINVAL;
2629 }
2630
2631 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) {
2632 if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD))
2633 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2634
2635 /*
2636 * We can do the device add because we have a paused balanced,
2637 * change the exclusive op type and remember we should bring
2638 * back the paused balance
2639 */
2640 fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD;
2641 btrfs_exclop_start_unlock(fs_info);
2642 restore_op = true;
2643 }
2644
2645 vol_args = memdup_user(arg, sizeof(*vol_args));
2646 if (IS_ERR(vol_args)) {
2647 ret = PTR_ERR(vol_args);
2648 goto out;
2649 }
2650
2651 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2652 ret = btrfs_init_new_device(fs_info, vol_args->name);
2653
2654 if (!ret)
2655 btrfs_info(fs_info, "disk added %s", vol_args->name);
2656
2657 kfree(vol_args);
2658out:
2659 if (restore_op)
2660 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);
2661 else
2662 btrfs_exclop_finish(fs_info);
2663 return ret;
2664}
2665
2666static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
2667{
2668 BTRFS_DEV_LOOKUP_ARGS(args);
2669 struct inode *inode = file_inode(file);
2670 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2671 struct btrfs_ioctl_vol_args_v2 *vol_args;
2672 struct block_device *bdev = NULL;
2673 fmode_t mode;
2674 int ret;
2675 bool cancel = false;
2676
2677 if (!capable(CAP_SYS_ADMIN))
2678 return -EPERM;
2679
2680 vol_args = memdup_user(arg, sizeof(*vol_args));
2681 if (IS_ERR(vol_args))
2682 return PTR_ERR(vol_args);
2683
2684 if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
2685 ret = -EOPNOTSUPP;
2686 goto out;
2687 }
2688
2689 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
2690 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
2691 args.devid = vol_args->devid;
2692 } else if (!strcmp("cancel", vol_args->name)) {
2693 cancel = true;
2694 } else {
2695 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2696 if (ret)
2697 goto out;
2698 }
2699
2700 ret = mnt_want_write_file(file);
2701 if (ret)
2702 goto out;
2703
2704 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2705 cancel);
2706 if (ret)
2707 goto err_drop;
2708
2709 /* Exclusive operation is now claimed */
2710 ret = btrfs_rm_device(fs_info, &args, &bdev, &mode);
2711
2712 btrfs_exclop_finish(fs_info);
2713
2714 if (!ret) {
2715 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
2716 btrfs_info(fs_info, "device deleted: id %llu",
2717 vol_args->devid);
2718 else
2719 btrfs_info(fs_info, "device deleted: %s",
2720 vol_args->name);
2721 }
2722err_drop:
2723 mnt_drop_write_file(file);
2724 if (bdev)
2725 blkdev_put(bdev, mode);
2726out:
2727 btrfs_put_dev_args_from_path(&args);
2728 kfree(vol_args);
2729 return ret;
2730}
2731
2732static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2733{
2734 BTRFS_DEV_LOOKUP_ARGS(args);
2735 struct inode *inode = file_inode(file);
2736 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2737 struct btrfs_ioctl_vol_args *vol_args;
2738 struct block_device *bdev = NULL;
2739 fmode_t mode;
2740 int ret;
2741 bool cancel = false;
2742
2743 if (!capable(CAP_SYS_ADMIN))
2744 return -EPERM;
2745
2746 vol_args = memdup_user(arg, sizeof(*vol_args));
2747 if (IS_ERR(vol_args))
2748 return PTR_ERR(vol_args);
2749
2750 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2751 if (!strcmp("cancel", vol_args->name)) {
2752 cancel = true;
2753 } else {
2754 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2755 if (ret)
2756 goto out;
2757 }
2758
2759 ret = mnt_want_write_file(file);
2760 if (ret)
2761 goto out;
2762
2763 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2764 cancel);
2765 if (ret == 0) {
2766 ret = btrfs_rm_device(fs_info, &args, &bdev, &mode);
2767 if (!ret)
2768 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
2769 btrfs_exclop_finish(fs_info);
2770 }
2771
2772 mnt_drop_write_file(file);
2773 if (bdev)
2774 blkdev_put(bdev, mode);
2775out:
2776 btrfs_put_dev_args_from_path(&args);
2777 kfree(vol_args);
2778 return ret;
2779}
2780
2781static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
2782 void __user *arg)
2783{
2784 struct btrfs_ioctl_fs_info_args *fi_args;
2785 struct btrfs_device *device;
2786 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2787 u64 flags_in;
2788 int ret = 0;
2789
2790 fi_args = memdup_user(arg, sizeof(*fi_args));
2791 if (IS_ERR(fi_args))
2792 return PTR_ERR(fi_args);
2793
2794 flags_in = fi_args->flags;
2795 memset(fi_args, 0, sizeof(*fi_args));
2796
2797 rcu_read_lock();
2798 fi_args->num_devices = fs_devices->num_devices;
2799
2800 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
2801 if (device->devid > fi_args->max_id)
2802 fi_args->max_id = device->devid;
2803 }
2804 rcu_read_unlock();
2805
2806 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
2807 fi_args->nodesize = fs_info->nodesize;
2808 fi_args->sectorsize = fs_info->sectorsize;
2809 fi_args->clone_alignment = fs_info->sectorsize;
2810
2811 if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
2812 fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
2813 fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
2814 fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
2815 }
2816
2817 if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
2818 fi_args->generation = fs_info->generation;
2819 fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
2820 }
2821
2822 if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
2823 memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
2824 sizeof(fi_args->metadata_uuid));
2825 fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
2826 }
2827
2828 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2829 ret = -EFAULT;
2830
2831 kfree(fi_args);
2832 return ret;
2833}
2834
2835static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
2836 void __user *arg)
2837{
2838 BTRFS_DEV_LOOKUP_ARGS(args);
2839 struct btrfs_ioctl_dev_info_args *di_args;
2840 struct btrfs_device *dev;
2841 int ret = 0;
2842
2843 di_args = memdup_user(arg, sizeof(*di_args));
2844 if (IS_ERR(di_args))
2845 return PTR_ERR(di_args);
2846
2847 args.devid = di_args->devid;
2848 if (!btrfs_is_empty_uuid(di_args->uuid))
2849 args.uuid = di_args->uuid;
2850
2851 rcu_read_lock();
2852 dev = btrfs_find_device(fs_info->fs_devices, &args);
2853 if (!dev) {
2854 ret = -ENODEV;
2855 goto out;
2856 }
2857
2858 di_args->devid = dev->devid;
2859 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2860 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
2861 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2862 if (dev->name)
2863 strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path));
2864 else
2865 di_args->path[0] = '\0';
2866
2867out:
2868 rcu_read_unlock();
2869 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2870 ret = -EFAULT;
2871
2872 kfree(di_args);
2873 return ret;
2874}
2875
2876static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2877{
2878 struct inode *inode = file_inode(file);
2879 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2880 struct btrfs_root *root = BTRFS_I(inode)->root;
2881 struct btrfs_root *new_root;
2882 struct btrfs_dir_item *di;
2883 struct btrfs_trans_handle *trans;
2884 struct btrfs_path *path = NULL;
2885 struct btrfs_disk_key disk_key;
2886 struct fscrypt_str name = FSTR_INIT("default", 7);
2887 u64 objectid = 0;
2888 u64 dir_id;
2889 int ret;
2890
2891 if (!capable(CAP_SYS_ADMIN))
2892 return -EPERM;
2893
2894 ret = mnt_want_write_file(file);
2895 if (ret)
2896 return ret;
2897
2898 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2899 ret = -EFAULT;
2900 goto out;
2901 }
2902
2903 if (!objectid)
2904 objectid = BTRFS_FS_TREE_OBJECTID;
2905
2906 new_root = btrfs_get_fs_root(fs_info, objectid, true);
2907 if (IS_ERR(new_root)) {
2908 ret = PTR_ERR(new_root);
2909 goto out;
2910 }
2911 if (!is_fstree(new_root->root_key.objectid)) {
2912 ret = -ENOENT;
2913 goto out_free;
2914 }
2915
2916 path = btrfs_alloc_path();
2917 if (!path) {
2918 ret = -ENOMEM;
2919 goto out_free;
2920 }
2921
2922 trans = btrfs_start_transaction(root, 1);
2923 if (IS_ERR(trans)) {
2924 ret = PTR_ERR(trans);
2925 goto out_free;
2926 }
2927
2928 dir_id = btrfs_super_root_dir(fs_info->super_copy);
2929 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
2930 dir_id, &name, 1);
2931 if (IS_ERR_OR_NULL(di)) {
2932 btrfs_release_path(path);
2933 btrfs_end_transaction(trans);
2934 btrfs_err(fs_info,
2935 "Umm, you don't have the default diritem, this isn't going to work");
2936 ret = -ENOENT;
2937 goto out_free;
2938 }
2939
2940 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2941 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2942 btrfs_mark_buffer_dirty(path->nodes[0]);
2943 btrfs_release_path(path);
2944
2945 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
2946 btrfs_end_transaction(trans);
2947out_free:
2948 btrfs_put_root(new_root);
2949 btrfs_free_path(path);
2950out:
2951 mnt_drop_write_file(file);
2952 return ret;
2953}
2954
2955static void get_block_group_info(struct list_head *groups_list,
2956 struct btrfs_ioctl_space_info *space)
2957{
2958 struct btrfs_block_group *block_group;
2959
2960 space->total_bytes = 0;
2961 space->used_bytes = 0;
2962 space->flags = 0;
2963 list_for_each_entry(block_group, groups_list, list) {
2964 space->flags = block_group->flags;
2965 space->total_bytes += block_group->length;
2966 space->used_bytes += block_group->used;
2967 }
2968}
2969
2970static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
2971 void __user *arg)
2972{
2973 struct btrfs_ioctl_space_args space_args;
2974 struct btrfs_ioctl_space_info space;
2975 struct btrfs_ioctl_space_info *dest;
2976 struct btrfs_ioctl_space_info *dest_orig;
2977 struct btrfs_ioctl_space_info __user *user_dest;
2978 struct btrfs_space_info *info;
2979 static const u64 types[] = {
2980 BTRFS_BLOCK_GROUP_DATA,
2981 BTRFS_BLOCK_GROUP_SYSTEM,
2982 BTRFS_BLOCK_GROUP_METADATA,
2983 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
2984 };
2985 int num_types = 4;
2986 int alloc_size;
2987 int ret = 0;
2988 u64 slot_count = 0;
2989 int i, c;
2990
2991 if (copy_from_user(&space_args,
2992 (struct btrfs_ioctl_space_args __user *)arg,
2993 sizeof(space_args)))
2994 return -EFAULT;
2995
2996 for (i = 0; i < num_types; i++) {
2997 struct btrfs_space_info *tmp;
2998
2999 info = NULL;
3000 list_for_each_entry(tmp, &fs_info->space_info, list) {
3001 if (tmp->flags == types[i]) {
3002 info = tmp;
3003 break;
3004 }
3005 }
3006
3007 if (!info)
3008 continue;
3009
3010 down_read(&info->groups_sem);
3011 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3012 if (!list_empty(&info->block_groups[c]))
3013 slot_count++;
3014 }
3015 up_read(&info->groups_sem);
3016 }
3017
3018 /*
3019 * Global block reserve, exported as a space_info
3020 */
3021 slot_count++;
3022
3023 /* space_slots == 0 means they are asking for a count */
3024 if (space_args.space_slots == 0) {
3025 space_args.total_spaces = slot_count;
3026 goto out;
3027 }
3028
3029 slot_count = min_t(u64, space_args.space_slots, slot_count);
3030
3031 alloc_size = sizeof(*dest) * slot_count;
3032
3033 /* we generally have at most 6 or so space infos, one for each raid
3034 * level. So, a whole page should be more than enough for everyone
3035 */
3036 if (alloc_size > PAGE_SIZE)
3037 return -ENOMEM;
3038
3039 space_args.total_spaces = 0;
3040 dest = kmalloc(alloc_size, GFP_KERNEL);
3041 if (!dest)
3042 return -ENOMEM;
3043 dest_orig = dest;
3044
3045 /* now we have a buffer to copy into */
3046 for (i = 0; i < num_types; i++) {
3047 struct btrfs_space_info *tmp;
3048
3049 if (!slot_count)
3050 break;
3051
3052 info = NULL;
3053 list_for_each_entry(tmp, &fs_info->space_info, list) {
3054 if (tmp->flags == types[i]) {
3055 info = tmp;
3056 break;
3057 }
3058 }
3059
3060 if (!info)
3061 continue;
3062 down_read(&info->groups_sem);
3063 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3064 if (!list_empty(&info->block_groups[c])) {
3065 get_block_group_info(&info->block_groups[c],
3066 &space);
3067 memcpy(dest, &space, sizeof(space));
3068 dest++;
3069 space_args.total_spaces++;
3070 slot_count--;
3071 }
3072 if (!slot_count)
3073 break;
3074 }
3075 up_read(&info->groups_sem);
3076 }
3077
3078 /*
3079 * Add global block reserve
3080 */
3081 if (slot_count) {
3082 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
3083
3084 spin_lock(&block_rsv->lock);
3085 space.total_bytes = block_rsv->size;
3086 space.used_bytes = block_rsv->size - block_rsv->reserved;
3087 spin_unlock(&block_rsv->lock);
3088 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3089 memcpy(dest, &space, sizeof(space));
3090 space_args.total_spaces++;
3091 }
3092
3093 user_dest = (struct btrfs_ioctl_space_info __user *)
3094 (arg + sizeof(struct btrfs_ioctl_space_args));
3095
3096 if (copy_to_user(user_dest, dest_orig, alloc_size))
3097 ret = -EFAULT;
3098
3099 kfree(dest_orig);
3100out:
3101 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3102 ret = -EFAULT;
3103
3104 return ret;
3105}
3106
3107static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3108 void __user *argp)
3109{
3110 struct btrfs_trans_handle *trans;
3111 u64 transid;
3112
3113 trans = btrfs_attach_transaction_barrier(root);
3114 if (IS_ERR(trans)) {
3115 if (PTR_ERR(trans) != -ENOENT)
3116 return PTR_ERR(trans);
3117
3118 /* No running transaction, don't bother */
3119 transid = root->fs_info->last_trans_committed;
3120 goto out;
3121 }
3122 transid = trans->transid;
3123 btrfs_commit_transaction_async(trans);
3124out:
3125 if (argp)
3126 if (copy_to_user(argp, &transid, sizeof(transid)))
3127 return -EFAULT;
3128 return 0;
3129}
3130
3131static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
3132 void __user *argp)
3133{
3134 u64 transid;
3135
3136 if (argp) {
3137 if (copy_from_user(&transid, argp, sizeof(transid)))
3138 return -EFAULT;
3139 } else {
3140 transid = 0; /* current trans */
3141 }
3142 return btrfs_wait_for_commit(fs_info, transid);
3143}
3144
3145static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3146{
3147 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
3148 struct btrfs_ioctl_scrub_args *sa;
3149 int ret;
3150
3151 if (!capable(CAP_SYS_ADMIN))
3152 return -EPERM;
3153
3154 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3155 btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet");
3156 return -EINVAL;
3157 }
3158
3159 sa = memdup_user(arg, sizeof(*sa));
3160 if (IS_ERR(sa))
3161 return PTR_ERR(sa);
3162
3163 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3164 ret = mnt_want_write_file(file);
3165 if (ret)
3166 goto out;
3167 }
3168
3169 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
3170 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3171 0);
3172
3173 /*
3174 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
3175 * error. This is important as it allows user space to know how much
3176 * progress scrub has done. For example, if scrub is canceled we get
3177 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
3178 * space. Later user space can inspect the progress from the structure
3179 * btrfs_ioctl_scrub_args and resume scrub from where it left off
3180 * previously (btrfs-progs does this).
3181 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
3182 * then return -EFAULT to signal the structure was not copied or it may
3183 * be corrupt and unreliable due to a partial copy.
3184 */
3185 if (copy_to_user(arg, sa, sizeof(*sa)))
3186 ret = -EFAULT;
3187
3188 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3189 mnt_drop_write_file(file);
3190out:
3191 kfree(sa);
3192 return ret;
3193}
3194
3195static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
3196{
3197 if (!capable(CAP_SYS_ADMIN))
3198 return -EPERM;
3199
3200 return btrfs_scrub_cancel(fs_info);
3201}
3202
3203static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
3204 void __user *arg)
3205{
3206 struct btrfs_ioctl_scrub_args *sa;
3207 int ret;
3208
3209 if (!capable(CAP_SYS_ADMIN))
3210 return -EPERM;
3211
3212 sa = memdup_user(arg, sizeof(*sa));
3213 if (IS_ERR(sa))
3214 return PTR_ERR(sa);
3215
3216 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
3217
3218 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3219 ret = -EFAULT;
3220
3221 kfree(sa);
3222 return ret;
3223}
3224
3225static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
3226 void __user *arg)
3227{
3228 struct btrfs_ioctl_get_dev_stats *sa;
3229 int ret;
3230
3231 sa = memdup_user(arg, sizeof(*sa));
3232 if (IS_ERR(sa))
3233 return PTR_ERR(sa);
3234
3235 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3236 kfree(sa);
3237 return -EPERM;
3238 }
3239
3240 ret = btrfs_get_dev_stats(fs_info, sa);
3241
3242 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3243 ret = -EFAULT;
3244
3245 kfree(sa);
3246 return ret;
3247}
3248
3249static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
3250 void __user *arg)
3251{
3252 struct btrfs_ioctl_dev_replace_args *p;
3253 int ret;
3254
3255 if (!capable(CAP_SYS_ADMIN))
3256 return -EPERM;
3257
3258 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3259 btrfs_err(fs_info, "device replace not supported on extent tree v2 yet");
3260 return -EINVAL;
3261 }
3262
3263 p = memdup_user(arg, sizeof(*p));
3264 if (IS_ERR(p))
3265 return PTR_ERR(p);
3266
3267 switch (p->cmd) {
3268 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3269 if (sb_rdonly(fs_info->sb)) {
3270 ret = -EROFS;
3271 goto out;
3272 }
3273 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
3274 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3275 } else {
3276 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
3277 btrfs_exclop_finish(fs_info);
3278 }
3279 break;
3280 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3281 btrfs_dev_replace_status(fs_info, p);
3282 ret = 0;
3283 break;
3284 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3285 p->result = btrfs_dev_replace_cancel(fs_info);
3286 ret = 0;
3287 break;
3288 default:
3289 ret = -EINVAL;
3290 break;
3291 }
3292
3293 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3294 ret = -EFAULT;
3295out:
3296 kfree(p);
3297 return ret;
3298}
3299
3300static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3301{
3302 int ret = 0;
3303 int i;
3304 u64 rel_ptr;
3305 int size;
3306 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3307 struct inode_fs_paths *ipath = NULL;
3308 struct btrfs_path *path;
3309
3310 if (!capable(CAP_DAC_READ_SEARCH))
3311 return -EPERM;
3312
3313 path = btrfs_alloc_path();
3314 if (!path) {
3315 ret = -ENOMEM;
3316 goto out;
3317 }
3318
3319 ipa = memdup_user(arg, sizeof(*ipa));
3320 if (IS_ERR(ipa)) {
3321 ret = PTR_ERR(ipa);
3322 ipa = NULL;
3323 goto out;
3324 }
3325
3326 size = min_t(u32, ipa->size, 4096);
3327 ipath = init_ipath(size, root, path);
3328 if (IS_ERR(ipath)) {
3329 ret = PTR_ERR(ipath);
3330 ipath = NULL;
3331 goto out;
3332 }
3333
3334 ret = paths_from_inode(ipa->inum, ipath);
3335 if (ret < 0)
3336 goto out;
3337
3338 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3339 rel_ptr = ipath->fspath->val[i] -
3340 (u64)(unsigned long)ipath->fspath->val;
3341 ipath->fspath->val[i] = rel_ptr;
3342 }
3343
3344 btrfs_free_path(path);
3345 path = NULL;
3346 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
3347 ipath->fspath, size);
3348 if (ret) {
3349 ret = -EFAULT;
3350 goto out;
3351 }
3352
3353out:
3354 btrfs_free_path(path);
3355 free_ipath(ipath);
3356 kfree(ipa);
3357
3358 return ret;
3359}
3360
3361static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
3362 void __user *arg, int version)
3363{
3364 int ret = 0;
3365 int size;
3366 struct btrfs_ioctl_logical_ino_args *loi;
3367 struct btrfs_data_container *inodes = NULL;
3368 struct btrfs_path *path = NULL;
3369 bool ignore_offset;
3370
3371 if (!capable(CAP_SYS_ADMIN))
3372 return -EPERM;
3373
3374 loi = memdup_user(arg, sizeof(*loi));
3375 if (IS_ERR(loi))
3376 return PTR_ERR(loi);
3377
3378 if (version == 1) {
3379 ignore_offset = false;
3380 size = min_t(u32, loi->size, SZ_64K);
3381 } else {
3382 /* All reserved bits must be 0 for now */
3383 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
3384 ret = -EINVAL;
3385 goto out_loi;
3386 }
3387 /* Only accept flags we have defined so far */
3388 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
3389 ret = -EINVAL;
3390 goto out_loi;
3391 }
3392 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
3393 size = min_t(u32, loi->size, SZ_16M);
3394 }
3395
3396 inodes = init_data_container(size);
3397 if (IS_ERR(inodes)) {
3398 ret = PTR_ERR(inodes);
3399 goto out_loi;
3400 }
3401
3402 path = btrfs_alloc_path();
3403 if (!path) {
3404 ret = -ENOMEM;
3405 goto out;
3406 }
3407 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
3408 inodes, ignore_offset);
3409 btrfs_free_path(path);
3410 if (ret == -EINVAL)
3411 ret = -ENOENT;
3412 if (ret < 0)
3413 goto out;
3414
3415 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
3416 size);
3417 if (ret)
3418 ret = -EFAULT;
3419
3420out:
3421 kvfree(inodes);
3422out_loi:
3423 kfree(loi);
3424
3425 return ret;
3426}
3427
3428void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3429 struct btrfs_ioctl_balance_args *bargs)
3430{
3431 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3432
3433 bargs->flags = bctl->flags;
3434
3435 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
3436 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3437 if (atomic_read(&fs_info->balance_pause_req))
3438 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3439 if (atomic_read(&fs_info->balance_cancel_req))
3440 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3441
3442 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3443 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3444 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3445
3446 spin_lock(&fs_info->balance_lock);
3447 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3448 spin_unlock(&fs_info->balance_lock);
3449}
3450
3451/*
3452 * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as
3453 * required.
3454 *
3455 * @fs_info: the filesystem
3456 * @excl_acquired: ptr to boolean value which is set to false in case balance
3457 * is being resumed
3458 *
3459 * Return 0 on success in which case both fs_info::balance is acquired as well
3460 * as exclusive ops are blocked. In case of failure return an error code.
3461 */
3462static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired)
3463{
3464 int ret;
3465
3466 /*
3467 * Exclusive operation is locked. Three possibilities:
3468 * (1) some other op is running
3469 * (2) balance is running
3470 * (3) balance is paused -- special case (think resume)
3471 */
3472 while (1) {
3473 if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
3474 *excl_acquired = true;
3475 mutex_lock(&fs_info->balance_mutex);
3476 return 0;
3477 }
3478
3479 mutex_lock(&fs_info->balance_mutex);
3480 if (fs_info->balance_ctl) {
3481 /* This is either (2) or (3) */
3482 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3483 /* This is (2) */
3484 ret = -EINPROGRESS;
3485 goto out_failure;
3486
3487 } else {
3488 mutex_unlock(&fs_info->balance_mutex);
3489 /*
3490 * Lock released to allow other waiters to
3491 * continue, we'll reexamine the status again.
3492 */
3493 mutex_lock(&fs_info->balance_mutex);
3494
3495 if (fs_info->balance_ctl &&
3496 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3497 /* This is (3) */
3498 *excl_acquired = false;
3499 return 0;
3500 }
3501 }
3502 } else {
3503 /* This is (1) */
3504 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3505 goto out_failure;
3506 }
3507
3508 mutex_unlock(&fs_info->balance_mutex);
3509 }
3510
3511out_failure:
3512 mutex_unlock(&fs_info->balance_mutex);
3513 *excl_acquired = false;
3514 return ret;
3515}
3516
3517static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3518{
3519 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3520 struct btrfs_fs_info *fs_info = root->fs_info;
3521 struct btrfs_ioctl_balance_args *bargs;
3522 struct btrfs_balance_control *bctl;
3523 bool need_unlock = true;
3524 int ret;
3525
3526 if (!capable(CAP_SYS_ADMIN))
3527 return -EPERM;
3528
3529 ret = mnt_want_write_file(file);
3530 if (ret)
3531 return ret;
3532
3533 bargs = memdup_user(arg, sizeof(*bargs));
3534 if (IS_ERR(bargs)) {
3535 ret = PTR_ERR(bargs);
3536 bargs = NULL;
3537 goto out;
3538 }
3539
3540 ret = btrfs_try_lock_balance(fs_info, &need_unlock);
3541 if (ret)
3542 goto out;
3543
3544 lockdep_assert_held(&fs_info->balance_mutex);
3545
3546 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3547 if (!fs_info->balance_ctl) {
3548 ret = -ENOTCONN;
3549 goto out_unlock;
3550 }
3551
3552 bctl = fs_info->balance_ctl;
3553 spin_lock(&fs_info->balance_lock);
3554 bctl->flags |= BTRFS_BALANCE_RESUME;
3555 spin_unlock(&fs_info->balance_lock);
3556 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE);
3557
3558 goto do_balance;
3559 }
3560
3561 if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
3562 ret = -EINVAL;
3563 goto out_unlock;
3564 }
3565
3566 if (fs_info->balance_ctl) {
3567 ret = -EINPROGRESS;
3568 goto out_unlock;
3569 }
3570
3571 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
3572 if (!bctl) {
3573 ret = -ENOMEM;
3574 goto out_unlock;
3575 }
3576
3577 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3578 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3579 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3580
3581 bctl->flags = bargs->flags;
3582do_balance:
3583 /*
3584 * Ownership of bctl and exclusive operation goes to btrfs_balance.
3585 * bctl is freed in reset_balance_state, or, if restriper was paused
3586 * all the way until unmount, in free_fs_info. The flag should be
3587 * cleared after reset_balance_state.
3588 */
3589 need_unlock = false;
3590
3591 ret = btrfs_balance(fs_info, bctl, bargs);
3592 bctl = NULL;
3593
3594 if (ret == 0 || ret == -ECANCELED) {
3595 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3596 ret = -EFAULT;
3597 }
3598
3599 kfree(bctl);
3600out_unlock:
3601 mutex_unlock(&fs_info->balance_mutex);
3602 if (need_unlock)
3603 btrfs_exclop_finish(fs_info);
3604out:
3605 mnt_drop_write_file(file);
3606 kfree(bargs);
3607 return ret;
3608}
3609
3610static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
3611{
3612 if (!capable(CAP_SYS_ADMIN))
3613 return -EPERM;
3614
3615 switch (cmd) {
3616 case BTRFS_BALANCE_CTL_PAUSE:
3617 return btrfs_pause_balance(fs_info);
3618 case BTRFS_BALANCE_CTL_CANCEL:
3619 return btrfs_cancel_balance(fs_info);
3620 }
3621
3622 return -EINVAL;
3623}
3624
3625static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
3626 void __user *arg)
3627{
3628 struct btrfs_ioctl_balance_args *bargs;
3629 int ret = 0;
3630
3631 if (!capable(CAP_SYS_ADMIN))
3632 return -EPERM;
3633
3634 mutex_lock(&fs_info->balance_mutex);
3635 if (!fs_info->balance_ctl) {
3636 ret = -ENOTCONN;
3637 goto out;
3638 }
3639
3640 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
3641 if (!bargs) {
3642 ret = -ENOMEM;
3643 goto out;
3644 }
3645
3646 btrfs_update_ioctl_balance_args(fs_info, bargs);
3647
3648 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3649 ret = -EFAULT;
3650
3651 kfree(bargs);
3652out:
3653 mutex_unlock(&fs_info->balance_mutex);
3654 return ret;
3655}
3656
3657static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
3658{
3659 struct inode *inode = file_inode(file);
3660 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3661 struct btrfs_ioctl_quota_ctl_args *sa;
3662 int ret;
3663
3664 if (!capable(CAP_SYS_ADMIN))
3665 return -EPERM;
3666
3667 ret = mnt_want_write_file(file);
3668 if (ret)
3669 return ret;
3670
3671 sa = memdup_user(arg, sizeof(*sa));
3672 if (IS_ERR(sa)) {
3673 ret = PTR_ERR(sa);
3674 goto drop_write;
3675 }
3676
3677 down_write(&fs_info->subvol_sem);
3678
3679 switch (sa->cmd) {
3680 case BTRFS_QUOTA_CTL_ENABLE:
3681 ret = btrfs_quota_enable(fs_info);
3682 break;
3683 case BTRFS_QUOTA_CTL_DISABLE:
3684 ret = btrfs_quota_disable(fs_info);
3685 break;
3686 default:
3687 ret = -EINVAL;
3688 break;
3689 }
3690
3691 kfree(sa);
3692 up_write(&fs_info->subvol_sem);
3693drop_write:
3694 mnt_drop_write_file(file);
3695 return ret;
3696}
3697
3698static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
3699{
3700 struct inode *inode = file_inode(file);
3701 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3702 struct btrfs_root *root = BTRFS_I(inode)->root;
3703 struct btrfs_ioctl_qgroup_assign_args *sa;
3704 struct btrfs_trans_handle *trans;
3705 int ret;
3706 int err;
3707
3708 if (!capable(CAP_SYS_ADMIN))
3709 return -EPERM;
3710
3711 ret = mnt_want_write_file(file);
3712 if (ret)
3713 return ret;
3714
3715 sa = memdup_user(arg, sizeof(*sa));
3716 if (IS_ERR(sa)) {
3717 ret = PTR_ERR(sa);
3718 goto drop_write;
3719 }
3720
3721 trans = btrfs_join_transaction(root);
3722 if (IS_ERR(trans)) {
3723 ret = PTR_ERR(trans);
3724 goto out;
3725 }
3726
3727 if (sa->assign) {
3728 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
3729 } else {
3730 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
3731 }
3732
3733 /* update qgroup status and info */
3734 err = btrfs_run_qgroups(trans);
3735 if (err < 0)
3736 btrfs_handle_fs_error(fs_info, err,
3737 "failed to update qgroup status and info");
3738 err = btrfs_end_transaction(trans);
3739 if (err && !ret)
3740 ret = err;
3741
3742out:
3743 kfree(sa);
3744drop_write:
3745 mnt_drop_write_file(file);
3746 return ret;
3747}
3748
3749static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
3750{
3751 struct inode *inode = file_inode(file);
3752 struct btrfs_root *root = BTRFS_I(inode)->root;
3753 struct btrfs_ioctl_qgroup_create_args *sa;
3754 struct btrfs_trans_handle *trans;
3755 int ret;
3756 int err;
3757
3758 if (!capable(CAP_SYS_ADMIN))
3759 return -EPERM;
3760
3761 ret = mnt_want_write_file(file);
3762 if (ret)
3763 return ret;
3764
3765 sa = memdup_user(arg, sizeof(*sa));
3766 if (IS_ERR(sa)) {
3767 ret = PTR_ERR(sa);
3768 goto drop_write;
3769 }
3770
3771 if (!sa->qgroupid) {
3772 ret = -EINVAL;
3773 goto out;
3774 }
3775
3776 trans = btrfs_join_transaction(root);
3777 if (IS_ERR(trans)) {
3778 ret = PTR_ERR(trans);
3779 goto out;
3780 }
3781
3782 if (sa->create) {
3783 ret = btrfs_create_qgroup(trans, sa->qgroupid);
3784 } else {
3785 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
3786 }
3787
3788 err = btrfs_end_transaction(trans);
3789 if (err && !ret)
3790 ret = err;
3791
3792out:
3793 kfree(sa);
3794drop_write:
3795 mnt_drop_write_file(file);
3796 return ret;
3797}
3798
3799static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
3800{
3801 struct inode *inode = file_inode(file);
3802 struct btrfs_root *root = BTRFS_I(inode)->root;
3803 struct btrfs_ioctl_qgroup_limit_args *sa;
3804 struct btrfs_trans_handle *trans;
3805 int ret;
3806 int err;
3807 u64 qgroupid;
3808
3809 if (!capable(CAP_SYS_ADMIN))
3810 return -EPERM;
3811
3812 ret = mnt_want_write_file(file);
3813 if (ret)
3814 return ret;
3815
3816 sa = memdup_user(arg, sizeof(*sa));
3817 if (IS_ERR(sa)) {
3818 ret = PTR_ERR(sa);
3819 goto drop_write;
3820 }
3821
3822 trans = btrfs_join_transaction(root);
3823 if (IS_ERR(trans)) {
3824 ret = PTR_ERR(trans);
3825 goto out;
3826 }
3827
3828 qgroupid = sa->qgroupid;
3829 if (!qgroupid) {
3830 /* take the current subvol as qgroup */
3831 qgroupid = root->root_key.objectid;
3832 }
3833
3834 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
3835
3836 err = btrfs_end_transaction(trans);
3837 if (err && !ret)
3838 ret = err;
3839
3840out:
3841 kfree(sa);
3842drop_write:
3843 mnt_drop_write_file(file);
3844 return ret;
3845}
3846
3847static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
3848{
3849 struct inode *inode = file_inode(file);
3850 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3851 struct btrfs_ioctl_quota_rescan_args *qsa;
3852 int ret;
3853
3854 if (!capable(CAP_SYS_ADMIN))
3855 return -EPERM;
3856
3857 ret = mnt_want_write_file(file);
3858 if (ret)
3859 return ret;
3860
3861 qsa = memdup_user(arg, sizeof(*qsa));
3862 if (IS_ERR(qsa)) {
3863 ret = PTR_ERR(qsa);
3864 goto drop_write;
3865 }
3866
3867 if (qsa->flags) {
3868 ret = -EINVAL;
3869 goto out;
3870 }
3871
3872 ret = btrfs_qgroup_rescan(fs_info);
3873
3874out:
3875 kfree(qsa);
3876drop_write:
3877 mnt_drop_write_file(file);
3878 return ret;
3879}
3880
3881static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
3882 void __user *arg)
3883{
3884 struct btrfs_ioctl_quota_rescan_args qsa = {0};
3885
3886 if (!capable(CAP_SYS_ADMIN))
3887 return -EPERM;
3888
3889 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
3890 qsa.flags = 1;
3891 qsa.progress = fs_info->qgroup_rescan_progress.objectid;
3892 }
3893
3894 if (copy_to_user(arg, &qsa, sizeof(qsa)))
3895 return -EFAULT;
3896
3897 return 0;
3898}
3899
3900static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
3901 void __user *arg)
3902{
3903 if (!capable(CAP_SYS_ADMIN))
3904 return -EPERM;
3905
3906 return btrfs_qgroup_wait_for_completion(fs_info, true);
3907}
3908
3909static long _btrfs_ioctl_set_received_subvol(struct file *file,
3910 struct user_namespace *mnt_userns,
3911 struct btrfs_ioctl_received_subvol_args *sa)
3912{
3913 struct inode *inode = file_inode(file);
3914 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3915 struct btrfs_root *root = BTRFS_I(inode)->root;
3916 struct btrfs_root_item *root_item = &root->root_item;
3917 struct btrfs_trans_handle *trans;
3918 struct timespec64 ct = current_time(inode);
3919 int ret = 0;
3920 int received_uuid_changed;
3921
3922 if (!inode_owner_or_capable(mnt_userns, inode))
3923 return -EPERM;
3924
3925 ret = mnt_want_write_file(file);
3926 if (ret < 0)
3927 return ret;
3928
3929 down_write(&fs_info->subvol_sem);
3930
3931 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
3932 ret = -EINVAL;
3933 goto out;
3934 }
3935
3936 if (btrfs_root_readonly(root)) {
3937 ret = -EROFS;
3938 goto out;
3939 }
3940
3941 /*
3942 * 1 - root item
3943 * 2 - uuid items (received uuid + subvol uuid)
3944 */
3945 trans = btrfs_start_transaction(root, 3);
3946 if (IS_ERR(trans)) {
3947 ret = PTR_ERR(trans);
3948 trans = NULL;
3949 goto out;
3950 }
3951
3952 sa->rtransid = trans->transid;
3953 sa->rtime.sec = ct.tv_sec;
3954 sa->rtime.nsec = ct.tv_nsec;
3955
3956 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
3957 BTRFS_UUID_SIZE);
3958 if (received_uuid_changed &&
3959 !btrfs_is_empty_uuid(root_item->received_uuid)) {
3960 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
3961 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
3962 root->root_key.objectid);
3963 if (ret && ret != -ENOENT) {
3964 btrfs_abort_transaction(trans, ret);
3965 btrfs_end_transaction(trans);
3966 goto out;
3967 }
3968 }
3969 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
3970 btrfs_set_root_stransid(root_item, sa->stransid);
3971 btrfs_set_root_rtransid(root_item, sa->rtransid);
3972 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
3973 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
3974 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
3975 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
3976
3977 ret = btrfs_update_root(trans, fs_info->tree_root,
3978 &root->root_key, &root->root_item);
3979 if (ret < 0) {
3980 btrfs_end_transaction(trans);
3981 goto out;
3982 }
3983 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
3984 ret = btrfs_uuid_tree_add(trans, sa->uuid,
3985 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
3986 root->root_key.objectid);
3987 if (ret < 0 && ret != -EEXIST) {
3988 btrfs_abort_transaction(trans, ret);
3989 btrfs_end_transaction(trans);
3990 goto out;
3991 }
3992 }
3993 ret = btrfs_commit_transaction(trans);
3994out:
3995 up_write(&fs_info->subvol_sem);
3996 mnt_drop_write_file(file);
3997 return ret;
3998}
3999
4000#ifdef CONFIG_64BIT
4001static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4002 void __user *arg)
4003{
4004 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4005 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4006 int ret = 0;
4007
4008 args32 = memdup_user(arg, sizeof(*args32));
4009 if (IS_ERR(args32))
4010 return PTR_ERR(args32);
4011
4012 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
4013 if (!args64) {
4014 ret = -ENOMEM;
4015 goto out;
4016 }
4017
4018 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4019 args64->stransid = args32->stransid;
4020 args64->rtransid = args32->rtransid;
4021 args64->stime.sec = args32->stime.sec;
4022 args64->stime.nsec = args32->stime.nsec;
4023 args64->rtime.sec = args32->rtime.sec;
4024 args64->rtime.nsec = args32->rtime.nsec;
4025 args64->flags = args32->flags;
4026
4027 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64);
4028 if (ret)
4029 goto out;
4030
4031 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4032 args32->stransid = args64->stransid;
4033 args32->rtransid = args64->rtransid;
4034 args32->stime.sec = args64->stime.sec;
4035 args32->stime.nsec = args64->stime.nsec;
4036 args32->rtime.sec = args64->rtime.sec;
4037 args32->rtime.nsec = args64->rtime.nsec;
4038 args32->flags = args64->flags;
4039
4040 ret = copy_to_user(arg, args32, sizeof(*args32));
4041 if (ret)
4042 ret = -EFAULT;
4043
4044out:
4045 kfree(args32);
4046 kfree(args64);
4047 return ret;
4048}
4049#endif
4050
4051static long btrfs_ioctl_set_received_subvol(struct file *file,
4052 void __user *arg)
4053{
4054 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4055 int ret = 0;
4056
4057 sa = memdup_user(arg, sizeof(*sa));
4058 if (IS_ERR(sa))
4059 return PTR_ERR(sa);
4060
4061 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa);
4062
4063 if (ret)
4064 goto out;
4065
4066 ret = copy_to_user(arg, sa, sizeof(*sa));
4067 if (ret)
4068 ret = -EFAULT;
4069
4070out:
4071 kfree(sa);
4072 return ret;
4073}
4074
4075static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
4076 void __user *arg)
4077{
4078 size_t len;
4079 int ret;
4080 char label[BTRFS_LABEL_SIZE];
4081
4082 spin_lock(&fs_info->super_lock);
4083 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4084 spin_unlock(&fs_info->super_lock);
4085
4086 len = strnlen(label, BTRFS_LABEL_SIZE);
4087
4088 if (len == BTRFS_LABEL_SIZE) {
4089 btrfs_warn(fs_info,
4090 "label is too long, return the first %zu bytes",
4091 --len);
4092 }
4093
4094 ret = copy_to_user(arg, label, len);
4095
4096 return ret ? -EFAULT : 0;
4097}
4098
4099static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4100{
4101 struct inode *inode = file_inode(file);
4102 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4103 struct btrfs_root *root = BTRFS_I(inode)->root;
4104 struct btrfs_super_block *super_block = fs_info->super_copy;
4105 struct btrfs_trans_handle *trans;
4106 char label[BTRFS_LABEL_SIZE];
4107 int ret;
4108
4109 if (!capable(CAP_SYS_ADMIN))
4110 return -EPERM;
4111
4112 if (copy_from_user(label, arg, sizeof(label)))
4113 return -EFAULT;
4114
4115 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4116 btrfs_err(fs_info,
4117 "unable to set label with more than %d bytes",
4118 BTRFS_LABEL_SIZE - 1);
4119 return -EINVAL;
4120 }
4121
4122 ret = mnt_want_write_file(file);
4123 if (ret)
4124 return ret;
4125
4126 trans = btrfs_start_transaction(root, 0);
4127 if (IS_ERR(trans)) {
4128 ret = PTR_ERR(trans);
4129 goto out_unlock;
4130 }
4131
4132 spin_lock(&fs_info->super_lock);
4133 strcpy(super_block->label, label);
4134 spin_unlock(&fs_info->super_lock);
4135 ret = btrfs_commit_transaction(trans);
4136
4137out_unlock:
4138 mnt_drop_write_file(file);
4139 return ret;
4140}
4141
4142#define INIT_FEATURE_FLAGS(suffix) \
4143 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4144 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4145 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4146
4147int btrfs_ioctl_get_supported_features(void __user *arg)
4148{
4149 static const struct btrfs_ioctl_feature_flags features[3] = {
4150 INIT_FEATURE_FLAGS(SUPP),
4151 INIT_FEATURE_FLAGS(SAFE_SET),
4152 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4153 };
4154
4155 if (copy_to_user(arg, &features, sizeof(features)))
4156 return -EFAULT;
4157
4158 return 0;
4159}
4160
4161static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
4162 void __user *arg)
4163{
4164 struct btrfs_super_block *super_block = fs_info->super_copy;
4165 struct btrfs_ioctl_feature_flags features;
4166
4167 features.compat_flags = btrfs_super_compat_flags(super_block);
4168 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4169 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4170
4171 if (copy_to_user(arg, &features, sizeof(features)))
4172 return -EFAULT;
4173
4174 return 0;
4175}
4176
4177static int check_feature_bits(struct btrfs_fs_info *fs_info,
4178 enum btrfs_feature_set set,
4179 u64 change_mask, u64 flags, u64 supported_flags,
4180 u64 safe_set, u64 safe_clear)
4181{
4182 const char *type = btrfs_feature_set_name(set);
4183 char *names;
4184 u64 disallowed, unsupported;
4185 u64 set_mask = flags & change_mask;
4186 u64 clear_mask = ~flags & change_mask;
4187
4188 unsupported = set_mask & ~supported_flags;
4189 if (unsupported) {
4190 names = btrfs_printable_features(set, unsupported);
4191 if (names) {
4192 btrfs_warn(fs_info,
4193 "this kernel does not support the %s feature bit%s",
4194 names, strchr(names, ',') ? "s" : "");
4195 kfree(names);
4196 } else
4197 btrfs_warn(fs_info,
4198 "this kernel does not support %s bits 0x%llx",
4199 type, unsupported);
4200 return -EOPNOTSUPP;
4201 }
4202
4203 disallowed = set_mask & ~safe_set;
4204 if (disallowed) {
4205 names = btrfs_printable_features(set, disallowed);
4206 if (names) {
4207 btrfs_warn(fs_info,
4208 "can't set the %s feature bit%s while mounted",
4209 names, strchr(names, ',') ? "s" : "");
4210 kfree(names);
4211 } else
4212 btrfs_warn(fs_info,
4213 "can't set %s bits 0x%llx while mounted",
4214 type, disallowed);
4215 return -EPERM;
4216 }
4217
4218 disallowed = clear_mask & ~safe_clear;
4219 if (disallowed) {
4220 names = btrfs_printable_features(set, disallowed);
4221 if (names) {
4222 btrfs_warn(fs_info,
4223 "can't clear the %s feature bit%s while mounted",
4224 names, strchr(names, ',') ? "s" : "");
4225 kfree(names);
4226 } else
4227 btrfs_warn(fs_info,
4228 "can't clear %s bits 0x%llx while mounted",
4229 type, disallowed);
4230 return -EPERM;
4231 }
4232
4233 return 0;
4234}
4235
4236#define check_feature(fs_info, change_mask, flags, mask_base) \
4237check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
4238 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4239 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4240 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4241
4242static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4243{
4244 struct inode *inode = file_inode(file);
4245 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4246 struct btrfs_root *root = BTRFS_I(inode)->root;
4247 struct btrfs_super_block *super_block = fs_info->super_copy;
4248 struct btrfs_ioctl_feature_flags flags[2];
4249 struct btrfs_trans_handle *trans;
4250 u64 newflags;
4251 int ret;
4252
4253 if (!capable(CAP_SYS_ADMIN))
4254 return -EPERM;
4255
4256 if (copy_from_user(flags, arg, sizeof(flags)))
4257 return -EFAULT;
4258
4259 /* Nothing to do */
4260 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4261 !flags[0].incompat_flags)
4262 return 0;
4263
4264 ret = check_feature(fs_info, flags[0].compat_flags,
4265 flags[1].compat_flags, COMPAT);
4266 if (ret)
4267 return ret;
4268
4269 ret = check_feature(fs_info, flags[0].compat_ro_flags,
4270 flags[1].compat_ro_flags, COMPAT_RO);
4271 if (ret)
4272 return ret;
4273
4274 ret = check_feature(fs_info, flags[0].incompat_flags,
4275 flags[1].incompat_flags, INCOMPAT);
4276 if (ret)
4277 return ret;
4278
4279 ret = mnt_want_write_file(file);
4280 if (ret)
4281 return ret;
4282
4283 trans = btrfs_start_transaction(root, 0);
4284 if (IS_ERR(trans)) {
4285 ret = PTR_ERR(trans);
4286 goto out_drop_write;
4287 }
4288
4289 spin_lock(&fs_info->super_lock);
4290 newflags = btrfs_super_compat_flags(super_block);
4291 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4292 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4293 btrfs_set_super_compat_flags(super_block, newflags);
4294
4295 newflags = btrfs_super_compat_ro_flags(super_block);
4296 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4297 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4298 btrfs_set_super_compat_ro_flags(super_block, newflags);
4299
4300 newflags = btrfs_super_incompat_flags(super_block);
4301 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4302 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4303 btrfs_set_super_incompat_flags(super_block, newflags);
4304 spin_unlock(&fs_info->super_lock);
4305
4306 ret = btrfs_commit_transaction(trans);
4307out_drop_write:
4308 mnt_drop_write_file(file);
4309
4310 return ret;
4311}
4312
4313static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat)
4314{
4315 struct btrfs_ioctl_send_args *arg;
4316 int ret;
4317
4318 if (compat) {
4319#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4320 struct btrfs_ioctl_send_args_32 args32;
4321
4322 ret = copy_from_user(&args32, argp, sizeof(args32));
4323 if (ret)
4324 return -EFAULT;
4325 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
4326 if (!arg)
4327 return -ENOMEM;
4328 arg->send_fd = args32.send_fd;
4329 arg->clone_sources_count = args32.clone_sources_count;
4330 arg->clone_sources = compat_ptr(args32.clone_sources);
4331 arg->parent_root = args32.parent_root;
4332 arg->flags = args32.flags;
4333 memcpy(arg->reserved, args32.reserved,
4334 sizeof(args32.reserved));
4335#else
4336 return -ENOTTY;
4337#endif
4338 } else {
4339 arg = memdup_user(argp, sizeof(*arg));
4340 if (IS_ERR(arg))
4341 return PTR_ERR(arg);
4342 }
4343 ret = btrfs_ioctl_send(inode, arg);
4344 kfree(arg);
4345 return ret;
4346}
4347
4348static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp,
4349 bool compat)
4350{
4351 struct btrfs_ioctl_encoded_io_args args = { 0 };
4352 size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args,
4353 flags);
4354 size_t copy_end;
4355 struct iovec iovstack[UIO_FASTIOV];
4356 struct iovec *iov = iovstack;
4357 struct iov_iter iter;
4358 loff_t pos;
4359 struct kiocb kiocb;
4360 ssize_t ret;
4361
4362 if (!capable(CAP_SYS_ADMIN)) {
4363 ret = -EPERM;
4364 goto out_acct;
4365 }
4366
4367 if (compat) {
4368#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4369 struct btrfs_ioctl_encoded_io_args_32 args32;
4370
4371 copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32,
4372 flags);
4373 if (copy_from_user(&args32, argp, copy_end)) {
4374 ret = -EFAULT;
4375 goto out_acct;
4376 }
4377 args.iov = compat_ptr(args32.iov);
4378 args.iovcnt = args32.iovcnt;
4379 args.offset = args32.offset;
4380 args.flags = args32.flags;
4381#else
4382 return -ENOTTY;
4383#endif
4384 } else {
4385 copy_end = copy_end_kernel;
4386 if (copy_from_user(&args, argp, copy_end)) {
4387 ret = -EFAULT;
4388 goto out_acct;
4389 }
4390 }
4391 if (args.flags != 0) {
4392 ret = -EINVAL;
4393 goto out_acct;
4394 }
4395
4396 ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4397 &iov, &iter);
4398 if (ret < 0)
4399 goto out_acct;
4400
4401 if (iov_iter_count(&iter) == 0) {
4402 ret = 0;
4403 goto out_iov;
4404 }
4405 pos = args.offset;
4406 ret = rw_verify_area(READ, file, &pos, args.len);
4407 if (ret < 0)
4408 goto out_iov;
4409
4410 init_sync_kiocb(&kiocb, file);
4411 kiocb.ki_pos = pos;
4412
4413 ret = btrfs_encoded_read(&kiocb, &iter, &args);
4414 if (ret >= 0) {
4415 fsnotify_access(file);
4416 if (copy_to_user(argp + copy_end,
4417 (char *)&args + copy_end_kernel,
4418 sizeof(args) - copy_end_kernel))
4419 ret = -EFAULT;
4420 }
4421
4422out_iov:
4423 kfree(iov);
4424out_acct:
4425 if (ret > 0)
4426 add_rchar(current, ret);
4427 inc_syscr(current);
4428 return ret;
4429}
4430
4431static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat)
4432{
4433 struct btrfs_ioctl_encoded_io_args args;
4434 struct iovec iovstack[UIO_FASTIOV];
4435 struct iovec *iov = iovstack;
4436 struct iov_iter iter;
4437 loff_t pos;
4438 struct kiocb kiocb;
4439 ssize_t ret;
4440
4441 if (!capable(CAP_SYS_ADMIN)) {
4442 ret = -EPERM;
4443 goto out_acct;
4444 }
4445
4446 if (!(file->f_mode & FMODE_WRITE)) {
4447 ret = -EBADF;
4448 goto out_acct;
4449 }
4450
4451 if (compat) {
4452#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4453 struct btrfs_ioctl_encoded_io_args_32 args32;
4454
4455 if (copy_from_user(&args32, argp, sizeof(args32))) {
4456 ret = -EFAULT;
4457 goto out_acct;
4458 }
4459 args.iov = compat_ptr(args32.iov);
4460 args.iovcnt = args32.iovcnt;
4461 args.offset = args32.offset;
4462 args.flags = args32.flags;
4463 args.len = args32.len;
4464 args.unencoded_len = args32.unencoded_len;
4465 args.unencoded_offset = args32.unencoded_offset;
4466 args.compression = args32.compression;
4467 args.encryption = args32.encryption;
4468 memcpy(args.reserved, args32.reserved, sizeof(args.reserved));
4469#else
4470 return -ENOTTY;
4471#endif
4472 } else {
4473 if (copy_from_user(&args, argp, sizeof(args))) {
4474 ret = -EFAULT;
4475 goto out_acct;
4476 }
4477 }
4478
4479 ret = -EINVAL;
4480 if (args.flags != 0)
4481 goto out_acct;
4482 if (memchr_inv(args.reserved, 0, sizeof(args.reserved)))
4483 goto out_acct;
4484 if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE &&
4485 args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE)
4486 goto out_acct;
4487 if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES ||
4488 args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES)
4489 goto out_acct;
4490 if (args.unencoded_offset > args.unencoded_len)
4491 goto out_acct;
4492 if (args.len > args.unencoded_len - args.unencoded_offset)
4493 goto out_acct;
4494
4495 ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4496 &iov, &iter);
4497 if (ret < 0)
4498 goto out_acct;
4499
4500 file_start_write(file);
4501
4502 if (iov_iter_count(&iter) == 0) {
4503 ret = 0;
4504 goto out_end_write;
4505 }
4506 pos = args.offset;
4507 ret = rw_verify_area(WRITE, file, &pos, args.len);
4508 if (ret < 0)
4509 goto out_end_write;
4510
4511 init_sync_kiocb(&kiocb, file);
4512 ret = kiocb_set_rw_flags(&kiocb, 0);
4513 if (ret)
4514 goto out_end_write;
4515 kiocb.ki_pos = pos;
4516
4517 ret = btrfs_do_write_iter(&kiocb, &iter, &args);
4518 if (ret > 0)
4519 fsnotify_modify(file);
4520
4521out_end_write:
4522 file_end_write(file);
4523 kfree(iov);
4524out_acct:
4525 if (ret > 0)
4526 add_wchar(current, ret);
4527 inc_syscw(current);
4528 return ret;
4529}
4530
4531long btrfs_ioctl(struct file *file, unsigned int
4532 cmd, unsigned long arg)
4533{
4534 struct inode *inode = file_inode(file);
4535 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4536 struct btrfs_root *root = BTRFS_I(inode)->root;
4537 void __user *argp = (void __user *)arg;
4538
4539 switch (cmd) {
4540 case FS_IOC_GETVERSION:
4541 return btrfs_ioctl_getversion(inode, argp);
4542 case FS_IOC_GETFSLABEL:
4543 return btrfs_ioctl_get_fslabel(fs_info, argp);
4544 case FS_IOC_SETFSLABEL:
4545 return btrfs_ioctl_set_fslabel(file, argp);
4546 case FITRIM:
4547 return btrfs_ioctl_fitrim(fs_info, argp);
4548 case BTRFS_IOC_SNAP_CREATE:
4549 return btrfs_ioctl_snap_create(file, argp, 0);
4550 case BTRFS_IOC_SNAP_CREATE_V2:
4551 return btrfs_ioctl_snap_create_v2(file, argp, 0);
4552 case BTRFS_IOC_SUBVOL_CREATE:
4553 return btrfs_ioctl_snap_create(file, argp, 1);
4554 case BTRFS_IOC_SUBVOL_CREATE_V2:
4555 return btrfs_ioctl_snap_create_v2(file, argp, 1);
4556 case BTRFS_IOC_SNAP_DESTROY:
4557 return btrfs_ioctl_snap_destroy(file, argp, false);
4558 case BTRFS_IOC_SNAP_DESTROY_V2:
4559 return btrfs_ioctl_snap_destroy(file, argp, true);
4560 case BTRFS_IOC_SUBVOL_GETFLAGS:
4561 return btrfs_ioctl_subvol_getflags(inode, argp);
4562 case BTRFS_IOC_SUBVOL_SETFLAGS:
4563 return btrfs_ioctl_subvol_setflags(file, argp);
4564 case BTRFS_IOC_DEFAULT_SUBVOL:
4565 return btrfs_ioctl_default_subvol(file, argp);
4566 case BTRFS_IOC_DEFRAG:
4567 return btrfs_ioctl_defrag(file, NULL);
4568 case BTRFS_IOC_DEFRAG_RANGE:
4569 return btrfs_ioctl_defrag(file, argp);
4570 case BTRFS_IOC_RESIZE:
4571 return btrfs_ioctl_resize(file, argp);
4572 case BTRFS_IOC_ADD_DEV:
4573 return btrfs_ioctl_add_dev(fs_info, argp);
4574 case BTRFS_IOC_RM_DEV:
4575 return btrfs_ioctl_rm_dev(file, argp);
4576 case BTRFS_IOC_RM_DEV_V2:
4577 return btrfs_ioctl_rm_dev_v2(file, argp);
4578 case BTRFS_IOC_FS_INFO:
4579 return btrfs_ioctl_fs_info(fs_info, argp);
4580 case BTRFS_IOC_DEV_INFO:
4581 return btrfs_ioctl_dev_info(fs_info, argp);
4582 case BTRFS_IOC_TREE_SEARCH:
4583 return btrfs_ioctl_tree_search(inode, argp);
4584 case BTRFS_IOC_TREE_SEARCH_V2:
4585 return btrfs_ioctl_tree_search_v2(inode, argp);
4586 case BTRFS_IOC_INO_LOOKUP:
4587 return btrfs_ioctl_ino_lookup(root, argp);
4588 case BTRFS_IOC_INO_PATHS:
4589 return btrfs_ioctl_ino_to_path(root, argp);
4590 case BTRFS_IOC_LOGICAL_INO:
4591 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
4592 case BTRFS_IOC_LOGICAL_INO_V2:
4593 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
4594 case BTRFS_IOC_SPACE_INFO:
4595 return btrfs_ioctl_space_info(fs_info, argp);
4596 case BTRFS_IOC_SYNC: {
4597 int ret;
4598
4599 ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
4600 if (ret)
4601 return ret;
4602 ret = btrfs_sync_fs(inode->i_sb, 1);
4603 /*
4604 * The transaction thread may want to do more work,
4605 * namely it pokes the cleaner kthread that will start
4606 * processing uncleaned subvols.
4607 */
4608 wake_up_process(fs_info->transaction_kthread);
4609 return ret;
4610 }
4611 case BTRFS_IOC_START_SYNC:
4612 return btrfs_ioctl_start_sync(root, argp);
4613 case BTRFS_IOC_WAIT_SYNC:
4614 return btrfs_ioctl_wait_sync(fs_info, argp);
4615 case BTRFS_IOC_SCRUB:
4616 return btrfs_ioctl_scrub(file, argp);
4617 case BTRFS_IOC_SCRUB_CANCEL:
4618 return btrfs_ioctl_scrub_cancel(fs_info);
4619 case BTRFS_IOC_SCRUB_PROGRESS:
4620 return btrfs_ioctl_scrub_progress(fs_info, argp);
4621 case BTRFS_IOC_BALANCE_V2:
4622 return btrfs_ioctl_balance(file, argp);
4623 case BTRFS_IOC_BALANCE_CTL:
4624 return btrfs_ioctl_balance_ctl(fs_info, arg);
4625 case BTRFS_IOC_BALANCE_PROGRESS:
4626 return btrfs_ioctl_balance_progress(fs_info, argp);
4627 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4628 return btrfs_ioctl_set_received_subvol(file, argp);
4629#ifdef CONFIG_64BIT
4630 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
4631 return btrfs_ioctl_set_received_subvol_32(file, argp);
4632#endif
4633 case BTRFS_IOC_SEND:
4634 return _btrfs_ioctl_send(inode, argp, false);
4635#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4636 case BTRFS_IOC_SEND_32:
4637 return _btrfs_ioctl_send(inode, argp, true);
4638#endif
4639 case BTRFS_IOC_GET_DEV_STATS:
4640 return btrfs_ioctl_get_dev_stats(fs_info, argp);
4641 case BTRFS_IOC_QUOTA_CTL:
4642 return btrfs_ioctl_quota_ctl(file, argp);
4643 case BTRFS_IOC_QGROUP_ASSIGN:
4644 return btrfs_ioctl_qgroup_assign(file, argp);
4645 case BTRFS_IOC_QGROUP_CREATE:
4646 return btrfs_ioctl_qgroup_create(file, argp);
4647 case BTRFS_IOC_QGROUP_LIMIT:
4648 return btrfs_ioctl_qgroup_limit(file, argp);
4649 case BTRFS_IOC_QUOTA_RESCAN:
4650 return btrfs_ioctl_quota_rescan(file, argp);
4651 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4652 return btrfs_ioctl_quota_rescan_status(fs_info, argp);
4653 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4654 return btrfs_ioctl_quota_rescan_wait(fs_info, argp);
4655 case BTRFS_IOC_DEV_REPLACE:
4656 return btrfs_ioctl_dev_replace(fs_info, argp);
4657 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4658 return btrfs_ioctl_get_supported_features(argp);
4659 case BTRFS_IOC_GET_FEATURES:
4660 return btrfs_ioctl_get_features(fs_info, argp);
4661 case BTRFS_IOC_SET_FEATURES:
4662 return btrfs_ioctl_set_features(file, argp);
4663 case BTRFS_IOC_GET_SUBVOL_INFO:
4664 return btrfs_ioctl_get_subvol_info(inode, argp);
4665 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
4666 return btrfs_ioctl_get_subvol_rootref(root, argp);
4667 case BTRFS_IOC_INO_LOOKUP_USER:
4668 return btrfs_ioctl_ino_lookup_user(file, argp);
4669 case FS_IOC_ENABLE_VERITY:
4670 return fsverity_ioctl_enable(file, (const void __user *)argp);
4671 case FS_IOC_MEASURE_VERITY:
4672 return fsverity_ioctl_measure(file, argp);
4673 case BTRFS_IOC_ENCODED_READ:
4674 return btrfs_ioctl_encoded_read(file, argp, false);
4675 case BTRFS_IOC_ENCODED_WRITE:
4676 return btrfs_ioctl_encoded_write(file, argp, false);
4677#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4678 case BTRFS_IOC_ENCODED_READ_32:
4679 return btrfs_ioctl_encoded_read(file, argp, true);
4680 case BTRFS_IOC_ENCODED_WRITE_32:
4681 return btrfs_ioctl_encoded_write(file, argp, true);
4682#endif
4683 }
4684
4685 return -ENOTTY;
4686}
4687
4688#ifdef CONFIG_COMPAT
4689long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
4690{
4691 /*
4692 * These all access 32-bit values anyway so no further
4693 * handling is necessary.
4694 */
4695 switch (cmd) {
4696 case FS_IOC32_GETVERSION:
4697 cmd = FS_IOC_GETVERSION;
4698 break;
4699 }
4700
4701 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
4702}
4703#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
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 <linux/fsverity.h>
31#include <linux/sched/xacct.h>
32#include "ctree.h"
33#include "disk-io.h"
34#include "export.h"
35#include "transaction.h"
36#include "btrfs_inode.h"
37#include "print-tree.h"
38#include "volumes.h"
39#include "locking.h"
40#include "backref.h"
41#include "rcu-string.h"
42#include "send.h"
43#include "dev-replace.h"
44#include "props.h"
45#include "sysfs.h"
46#include "qgroup.h"
47#include "tree-log.h"
48#include "compression.h"
49#include "space-info.h"
50#include "delalloc-space.h"
51#include "block-group.h"
52#include "subpage.h"
53#include "fs.h"
54#include "accessors.h"
55#include "extent-tree.h"
56#include "root-tree.h"
57#include "defrag.h"
58#include "dir-item.h"
59#include "uuid-tree.h"
60#include "ioctl.h"
61#include "file.h"
62#include "scrub.h"
63#include "super.h"
64
65#ifdef CONFIG_64BIT
66/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
67 * structures are incorrect, as the timespec structure from userspace
68 * is 4 bytes too small. We define these alternatives here to teach
69 * the kernel about the 32-bit struct packing.
70 */
71struct btrfs_ioctl_timespec_32 {
72 __u64 sec;
73 __u32 nsec;
74} __attribute__ ((__packed__));
75
76struct btrfs_ioctl_received_subvol_args_32 {
77 char uuid[BTRFS_UUID_SIZE]; /* in */
78 __u64 stransid; /* in */
79 __u64 rtransid; /* out */
80 struct btrfs_ioctl_timespec_32 stime; /* in */
81 struct btrfs_ioctl_timespec_32 rtime; /* out */
82 __u64 flags; /* in */
83 __u64 reserved[16]; /* in */
84} __attribute__ ((__packed__));
85
86#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
87 struct btrfs_ioctl_received_subvol_args_32)
88#endif
89
90#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
91struct btrfs_ioctl_send_args_32 {
92 __s64 send_fd; /* in */
93 __u64 clone_sources_count; /* in */
94 compat_uptr_t clone_sources; /* in */
95 __u64 parent_root; /* in */
96 __u64 flags; /* in */
97 __u32 version; /* in */
98 __u8 reserved[28]; /* in */
99} __attribute__ ((__packed__));
100
101#define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
102 struct btrfs_ioctl_send_args_32)
103
104struct btrfs_ioctl_encoded_io_args_32 {
105 compat_uptr_t iov;
106 compat_ulong_t iovcnt;
107 __s64 offset;
108 __u64 flags;
109 __u64 len;
110 __u64 unencoded_len;
111 __u64 unencoded_offset;
112 __u32 compression;
113 __u32 encryption;
114 __u8 reserved[64];
115};
116
117#define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \
118 struct btrfs_ioctl_encoded_io_args_32)
119#define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \
120 struct btrfs_ioctl_encoded_io_args_32)
121#endif
122
123/* Mask out flags that are inappropriate for the given type of inode. */
124static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
125 unsigned int flags)
126{
127 if (S_ISDIR(inode->i_mode))
128 return flags;
129 else if (S_ISREG(inode->i_mode))
130 return flags & ~FS_DIRSYNC_FL;
131 else
132 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
133}
134
135/*
136 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
137 * ioctl.
138 */
139static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode)
140{
141 unsigned int iflags = 0;
142 u32 flags = binode->flags;
143 u32 ro_flags = binode->ro_flags;
144
145 if (flags & BTRFS_INODE_SYNC)
146 iflags |= FS_SYNC_FL;
147 if (flags & BTRFS_INODE_IMMUTABLE)
148 iflags |= FS_IMMUTABLE_FL;
149 if (flags & BTRFS_INODE_APPEND)
150 iflags |= FS_APPEND_FL;
151 if (flags & BTRFS_INODE_NODUMP)
152 iflags |= FS_NODUMP_FL;
153 if (flags & BTRFS_INODE_NOATIME)
154 iflags |= FS_NOATIME_FL;
155 if (flags & BTRFS_INODE_DIRSYNC)
156 iflags |= FS_DIRSYNC_FL;
157 if (flags & BTRFS_INODE_NODATACOW)
158 iflags |= FS_NOCOW_FL;
159 if (ro_flags & BTRFS_INODE_RO_VERITY)
160 iflags |= FS_VERITY_FL;
161
162 if (flags & BTRFS_INODE_NOCOMPRESS)
163 iflags |= FS_NOCOMP_FL;
164 else if (flags & BTRFS_INODE_COMPRESS)
165 iflags |= FS_COMPR_FL;
166
167 return iflags;
168}
169
170/*
171 * Update inode->i_flags based on the btrfs internal flags.
172 */
173void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
174{
175 struct btrfs_inode *binode = BTRFS_I(inode);
176 unsigned int new_fl = 0;
177
178 if (binode->flags & BTRFS_INODE_SYNC)
179 new_fl |= S_SYNC;
180 if (binode->flags & BTRFS_INODE_IMMUTABLE)
181 new_fl |= S_IMMUTABLE;
182 if (binode->flags & BTRFS_INODE_APPEND)
183 new_fl |= S_APPEND;
184 if (binode->flags & BTRFS_INODE_NOATIME)
185 new_fl |= S_NOATIME;
186 if (binode->flags & BTRFS_INODE_DIRSYNC)
187 new_fl |= S_DIRSYNC;
188 if (binode->ro_flags & BTRFS_INODE_RO_VERITY)
189 new_fl |= S_VERITY;
190
191 set_mask_bits(&inode->i_flags,
192 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC |
193 S_VERITY, new_fl);
194}
195
196/*
197 * Check if @flags are a supported and valid set of FS_*_FL flags and that
198 * the old and new flags are not conflicting
199 */
200static int check_fsflags(unsigned int old_flags, unsigned int flags)
201{
202 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
203 FS_NOATIME_FL | FS_NODUMP_FL | \
204 FS_SYNC_FL | FS_DIRSYNC_FL | \
205 FS_NOCOMP_FL | FS_COMPR_FL |
206 FS_NOCOW_FL))
207 return -EOPNOTSUPP;
208
209 /* COMPR and NOCOMP on new/old are valid */
210 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
211 return -EINVAL;
212
213 if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
214 return -EINVAL;
215
216 /* NOCOW and compression options are mutually exclusive */
217 if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
218 return -EINVAL;
219 if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
220 return -EINVAL;
221
222 return 0;
223}
224
225static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
226 unsigned int flags)
227{
228 if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL))
229 return -EPERM;
230
231 return 0;
232}
233
234/*
235 * Set flags/xflags from the internal inode flags. The remaining items of
236 * fsxattr are zeroed.
237 */
238int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
239{
240 struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
241
242 fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode));
243 return 0;
244}
245
246int btrfs_fileattr_set(struct mnt_idmap *idmap,
247 struct dentry *dentry, struct fileattr *fa)
248{
249 struct inode *inode = d_inode(dentry);
250 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
251 struct btrfs_inode *binode = BTRFS_I(inode);
252 struct btrfs_root *root = binode->root;
253 struct btrfs_trans_handle *trans;
254 unsigned int fsflags, old_fsflags;
255 int ret;
256 const char *comp = NULL;
257 u32 binode_flags;
258
259 if (btrfs_root_readonly(root))
260 return -EROFS;
261
262 if (fileattr_has_fsx(fa))
263 return -EOPNOTSUPP;
264
265 fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
266 old_fsflags = btrfs_inode_flags_to_fsflags(binode);
267 ret = check_fsflags(old_fsflags, fsflags);
268 if (ret)
269 return ret;
270
271 ret = check_fsflags_compatible(fs_info, fsflags);
272 if (ret)
273 return ret;
274
275 binode_flags = binode->flags;
276 if (fsflags & FS_SYNC_FL)
277 binode_flags |= BTRFS_INODE_SYNC;
278 else
279 binode_flags &= ~BTRFS_INODE_SYNC;
280 if (fsflags & FS_IMMUTABLE_FL)
281 binode_flags |= BTRFS_INODE_IMMUTABLE;
282 else
283 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
284 if (fsflags & FS_APPEND_FL)
285 binode_flags |= BTRFS_INODE_APPEND;
286 else
287 binode_flags &= ~BTRFS_INODE_APPEND;
288 if (fsflags & FS_NODUMP_FL)
289 binode_flags |= BTRFS_INODE_NODUMP;
290 else
291 binode_flags &= ~BTRFS_INODE_NODUMP;
292 if (fsflags & FS_NOATIME_FL)
293 binode_flags |= BTRFS_INODE_NOATIME;
294 else
295 binode_flags &= ~BTRFS_INODE_NOATIME;
296
297 /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
298 if (!fa->flags_valid) {
299 /* 1 item for the inode */
300 trans = btrfs_start_transaction(root, 1);
301 if (IS_ERR(trans))
302 return PTR_ERR(trans);
303 goto update_flags;
304 }
305
306 if (fsflags & FS_DIRSYNC_FL)
307 binode_flags |= BTRFS_INODE_DIRSYNC;
308 else
309 binode_flags &= ~BTRFS_INODE_DIRSYNC;
310 if (fsflags & FS_NOCOW_FL) {
311 if (S_ISREG(inode->i_mode)) {
312 /*
313 * It's safe to turn csums off here, no extents exist.
314 * Otherwise we want the flag to reflect the real COW
315 * status of the file and will not set it.
316 */
317 if (inode->i_size == 0)
318 binode_flags |= BTRFS_INODE_NODATACOW |
319 BTRFS_INODE_NODATASUM;
320 } else {
321 binode_flags |= BTRFS_INODE_NODATACOW;
322 }
323 } else {
324 /*
325 * Revert back under same assumptions as above
326 */
327 if (S_ISREG(inode->i_mode)) {
328 if (inode->i_size == 0)
329 binode_flags &= ~(BTRFS_INODE_NODATACOW |
330 BTRFS_INODE_NODATASUM);
331 } else {
332 binode_flags &= ~BTRFS_INODE_NODATACOW;
333 }
334 }
335
336 /*
337 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
338 * flag may be changed automatically if compression code won't make
339 * things smaller.
340 */
341 if (fsflags & FS_NOCOMP_FL) {
342 binode_flags &= ~BTRFS_INODE_COMPRESS;
343 binode_flags |= BTRFS_INODE_NOCOMPRESS;
344 } else if (fsflags & FS_COMPR_FL) {
345
346 if (IS_SWAPFILE(inode))
347 return -ETXTBSY;
348
349 binode_flags |= BTRFS_INODE_COMPRESS;
350 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
351
352 comp = btrfs_compress_type2str(fs_info->compress_type);
353 if (!comp || comp[0] == 0)
354 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
355 } else {
356 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
357 }
358
359 /*
360 * 1 for inode item
361 * 2 for properties
362 */
363 trans = btrfs_start_transaction(root, 3);
364 if (IS_ERR(trans))
365 return PTR_ERR(trans);
366
367 if (comp) {
368 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
369 strlen(comp), 0);
370 if (ret) {
371 btrfs_abort_transaction(trans, ret);
372 goto out_end_trans;
373 }
374 } else {
375 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
376 0, 0);
377 if (ret && ret != -ENODATA) {
378 btrfs_abort_transaction(trans, ret);
379 goto out_end_trans;
380 }
381 }
382
383update_flags:
384 binode->flags = binode_flags;
385 btrfs_sync_inode_flags_to_i_flags(inode);
386 inode_inc_iversion(inode);
387 inode_set_ctime_current(inode);
388 ret = btrfs_update_inode(trans, BTRFS_I(inode));
389
390 out_end_trans:
391 btrfs_end_transaction(trans);
392 return ret;
393}
394
395/*
396 * Start exclusive operation @type, return true on success
397 */
398bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
399 enum btrfs_exclusive_operation type)
400{
401 bool ret = false;
402
403 spin_lock(&fs_info->super_lock);
404 if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) {
405 fs_info->exclusive_operation = type;
406 ret = true;
407 }
408 spin_unlock(&fs_info->super_lock);
409
410 return ret;
411}
412
413/*
414 * Conditionally allow to enter the exclusive operation in case it's compatible
415 * with the running one. This must be paired with btrfs_exclop_start_unlock and
416 * btrfs_exclop_finish.
417 *
418 * Compatibility:
419 * - the same type is already running
420 * - when trying to add a device and balance has been paused
421 * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller
422 * must check the condition first that would allow none -> @type
423 */
424bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
425 enum btrfs_exclusive_operation type)
426{
427 spin_lock(&fs_info->super_lock);
428 if (fs_info->exclusive_operation == type ||
429 (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED &&
430 type == BTRFS_EXCLOP_DEV_ADD))
431 return true;
432
433 spin_unlock(&fs_info->super_lock);
434 return false;
435}
436
437void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info)
438{
439 spin_unlock(&fs_info->super_lock);
440}
441
442void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
443{
444 spin_lock(&fs_info->super_lock);
445 WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
446 spin_unlock(&fs_info->super_lock);
447 sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
448}
449
450void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
451 enum btrfs_exclusive_operation op)
452{
453 switch (op) {
454 case BTRFS_EXCLOP_BALANCE_PAUSED:
455 spin_lock(&fs_info->super_lock);
456 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE ||
457 fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD ||
458 fs_info->exclusive_operation == BTRFS_EXCLOP_NONE ||
459 fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
460 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED;
461 spin_unlock(&fs_info->super_lock);
462 break;
463 case BTRFS_EXCLOP_BALANCE:
464 spin_lock(&fs_info->super_lock);
465 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
466 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE;
467 spin_unlock(&fs_info->super_lock);
468 break;
469 default:
470 btrfs_warn(fs_info,
471 "invalid exclop balance operation %d requested", op);
472 }
473}
474
475static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg)
476{
477 return put_user(inode->i_generation, arg);
478}
479
480static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
481 void __user *arg)
482{
483 struct btrfs_device *device;
484 struct fstrim_range range;
485 u64 minlen = ULLONG_MAX;
486 u64 num_devices = 0;
487 int ret;
488
489 if (!capable(CAP_SYS_ADMIN))
490 return -EPERM;
491
492 /*
493 * btrfs_trim_block_group() depends on space cache, which is not
494 * available in zoned filesystem. So, disallow fitrim on a zoned
495 * filesystem for now.
496 */
497 if (btrfs_is_zoned(fs_info))
498 return -EOPNOTSUPP;
499
500 /*
501 * If the fs is mounted with nologreplay, which requires it to be
502 * mounted in RO mode as well, we can not allow discard on free space
503 * inside block groups, because log trees refer to extents that are not
504 * pinned in a block group's free space cache (pinning the extents is
505 * precisely the first phase of replaying a log tree).
506 */
507 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
508 return -EROFS;
509
510 rcu_read_lock();
511 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
512 dev_list) {
513 if (!device->bdev || !bdev_max_discard_sectors(device->bdev))
514 continue;
515 num_devices++;
516 minlen = min_t(u64, bdev_discard_granularity(device->bdev),
517 minlen);
518 }
519 rcu_read_unlock();
520
521 if (!num_devices)
522 return -EOPNOTSUPP;
523 if (copy_from_user(&range, arg, sizeof(range)))
524 return -EFAULT;
525
526 /*
527 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
528 * block group is in the logical address space, which can be any
529 * sectorsize aligned bytenr in the range [0, U64_MAX].
530 */
531 if (range.len < fs_info->sb->s_blocksize)
532 return -EINVAL;
533
534 range.minlen = max(range.minlen, minlen);
535 ret = btrfs_trim_fs(fs_info, &range);
536 if (ret < 0)
537 return ret;
538
539 if (copy_to_user(arg, &range, sizeof(range)))
540 return -EFAULT;
541
542 return 0;
543}
544
545int __pure btrfs_is_empty_uuid(u8 *uuid)
546{
547 int i;
548
549 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
550 if (uuid[i])
551 return 0;
552 }
553 return 1;
554}
555
556/*
557 * Calculate the number of transaction items to reserve for creating a subvolume
558 * or snapshot, not including the inode, directory entries, or parent directory.
559 */
560static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit)
561{
562 /*
563 * 1 to add root block
564 * 1 to add root item
565 * 1 to add root ref
566 * 1 to add root backref
567 * 1 to add UUID item
568 * 1 to add qgroup info
569 * 1 to add qgroup limit
570 *
571 * Ideally the last two would only be accounted if qgroups are enabled,
572 * but that can change between now and the time we would insert them.
573 */
574 unsigned int num_items = 7;
575
576 if (inherit) {
577 /* 2 to add qgroup relations for each inherited qgroup */
578 num_items += 2 * inherit->num_qgroups;
579 }
580 return num_items;
581}
582
583static noinline int create_subvol(struct mnt_idmap *idmap,
584 struct inode *dir, struct dentry *dentry,
585 struct btrfs_qgroup_inherit *inherit)
586{
587 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
588 struct btrfs_trans_handle *trans;
589 struct btrfs_key key;
590 struct btrfs_root_item *root_item;
591 struct btrfs_inode_item *inode_item;
592 struct extent_buffer *leaf;
593 struct btrfs_root *root = BTRFS_I(dir)->root;
594 struct btrfs_root *new_root;
595 struct btrfs_block_rsv block_rsv;
596 struct timespec64 cur_time = current_time(dir);
597 struct btrfs_new_inode_args new_inode_args = {
598 .dir = dir,
599 .dentry = dentry,
600 .subvol = true,
601 };
602 unsigned int trans_num_items;
603 int ret;
604 dev_t anon_dev;
605 u64 objectid;
606
607 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
608 if (!root_item)
609 return -ENOMEM;
610
611 ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid);
612 if (ret)
613 goto out_root_item;
614
615 /*
616 * Don't create subvolume whose level is not zero. Or qgroup will be
617 * screwed up since it assumes subvolume qgroup's level to be 0.
618 */
619 if (btrfs_qgroup_level(objectid)) {
620 ret = -ENOSPC;
621 goto out_root_item;
622 }
623
624 ret = get_anon_bdev(&anon_dev);
625 if (ret < 0)
626 goto out_root_item;
627
628 new_inode_args.inode = btrfs_new_subvol_inode(idmap, dir);
629 if (!new_inode_args.inode) {
630 ret = -ENOMEM;
631 goto out_anon_dev;
632 }
633 ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items);
634 if (ret)
635 goto out_inode;
636 trans_num_items += create_subvol_num_items(inherit);
637
638 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
639 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
640 trans_num_items, false);
641 if (ret)
642 goto out_new_inode_args;
643
644 trans = btrfs_start_transaction(root, 0);
645 if (IS_ERR(trans)) {
646 ret = PTR_ERR(trans);
647 btrfs_subvolume_release_metadata(root, &block_rsv);
648 goto out_new_inode_args;
649 }
650 trans->block_rsv = &block_rsv;
651 trans->bytes_reserved = block_rsv.size;
652 /* Tree log can't currently deal with an inode which is a new root. */
653 btrfs_set_log_full_commit(trans);
654
655 ret = btrfs_qgroup_inherit(trans, 0, objectid, root->root_key.objectid, inherit);
656 if (ret)
657 goto out;
658
659 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
660 0, BTRFS_NESTING_NORMAL);
661 if (IS_ERR(leaf)) {
662 ret = PTR_ERR(leaf);
663 goto out;
664 }
665
666 btrfs_mark_buffer_dirty(trans, leaf);
667
668 inode_item = &root_item->inode;
669 btrfs_set_stack_inode_generation(inode_item, 1);
670 btrfs_set_stack_inode_size(inode_item, 3);
671 btrfs_set_stack_inode_nlink(inode_item, 1);
672 btrfs_set_stack_inode_nbytes(inode_item,
673 fs_info->nodesize);
674 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
675
676 btrfs_set_root_flags(root_item, 0);
677 btrfs_set_root_limit(root_item, 0);
678 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
679
680 btrfs_set_root_bytenr(root_item, leaf->start);
681 btrfs_set_root_generation(root_item, trans->transid);
682 btrfs_set_root_level(root_item, 0);
683 btrfs_set_root_refs(root_item, 1);
684 btrfs_set_root_used(root_item, leaf->len);
685 btrfs_set_root_last_snapshot(root_item, 0);
686
687 btrfs_set_root_generation_v2(root_item,
688 btrfs_root_generation(root_item));
689 generate_random_guid(root_item->uuid);
690 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
691 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
692 root_item->ctime = root_item->otime;
693 btrfs_set_root_ctransid(root_item, trans->transid);
694 btrfs_set_root_otransid(root_item, trans->transid);
695
696 btrfs_tree_unlock(leaf);
697
698 btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID);
699
700 key.objectid = objectid;
701 key.offset = 0;
702 key.type = BTRFS_ROOT_ITEM_KEY;
703 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
704 root_item);
705 if (ret) {
706 /*
707 * Since we don't abort the transaction in this case, free the
708 * tree block so that we don't leak space and leave the
709 * filesystem in an inconsistent state (an extent item in the
710 * extent tree with a backreference for a root that does not
711 * exists).
712 */
713 btrfs_tree_lock(leaf);
714 btrfs_clear_buffer_dirty(trans, leaf);
715 btrfs_tree_unlock(leaf);
716 btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
717 free_extent_buffer(leaf);
718 goto out;
719 }
720
721 free_extent_buffer(leaf);
722 leaf = NULL;
723
724 new_root = btrfs_get_new_fs_root(fs_info, objectid, &anon_dev);
725 if (IS_ERR(new_root)) {
726 ret = PTR_ERR(new_root);
727 btrfs_abort_transaction(trans, ret);
728 goto out;
729 }
730 /* anon_dev is owned by new_root now. */
731 anon_dev = 0;
732 BTRFS_I(new_inode_args.inode)->root = new_root;
733 /* ... and new_root is owned by new_inode_args.inode now. */
734
735 ret = btrfs_record_root_in_trans(trans, new_root);
736 if (ret) {
737 btrfs_abort_transaction(trans, ret);
738 goto out;
739 }
740
741 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
742 BTRFS_UUID_KEY_SUBVOL, objectid);
743 if (ret) {
744 btrfs_abort_transaction(trans, ret);
745 goto out;
746 }
747
748 ret = btrfs_create_new_inode(trans, &new_inode_args);
749 if (ret) {
750 btrfs_abort_transaction(trans, ret);
751 goto out;
752 }
753
754 d_instantiate_new(dentry, new_inode_args.inode);
755 new_inode_args.inode = NULL;
756
757out:
758 trans->block_rsv = NULL;
759 trans->bytes_reserved = 0;
760 btrfs_subvolume_release_metadata(root, &block_rsv);
761
762 btrfs_end_transaction(trans);
763out_new_inode_args:
764 btrfs_new_inode_args_destroy(&new_inode_args);
765out_inode:
766 iput(new_inode_args.inode);
767out_anon_dev:
768 if (anon_dev)
769 free_anon_bdev(anon_dev);
770out_root_item:
771 kfree(root_item);
772 return ret;
773}
774
775static int create_snapshot(struct btrfs_root *root, struct inode *dir,
776 struct dentry *dentry, bool readonly,
777 struct btrfs_qgroup_inherit *inherit)
778{
779 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
780 struct inode *inode;
781 struct btrfs_pending_snapshot *pending_snapshot;
782 unsigned int trans_num_items;
783 struct btrfs_trans_handle *trans;
784 int ret;
785
786 /* We do not support snapshotting right now. */
787 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
788 btrfs_warn(fs_info,
789 "extent tree v2 doesn't support snapshotting yet");
790 return -EOPNOTSUPP;
791 }
792
793 if (btrfs_root_refs(&root->root_item) == 0)
794 return -ENOENT;
795
796 if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
797 return -EINVAL;
798
799 if (atomic_read(&root->nr_swapfiles)) {
800 btrfs_warn(fs_info,
801 "cannot snapshot subvolume with active swapfile");
802 return -ETXTBSY;
803 }
804
805 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
806 if (!pending_snapshot)
807 return -ENOMEM;
808
809 ret = get_anon_bdev(&pending_snapshot->anon_dev);
810 if (ret < 0)
811 goto free_pending;
812 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
813 GFP_KERNEL);
814 pending_snapshot->path = btrfs_alloc_path();
815 if (!pending_snapshot->root_item || !pending_snapshot->path) {
816 ret = -ENOMEM;
817 goto free_pending;
818 }
819
820 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
821 BTRFS_BLOCK_RSV_TEMP);
822 /*
823 * 1 to add dir item
824 * 1 to add dir index
825 * 1 to update parent inode item
826 */
827 trans_num_items = create_subvol_num_items(inherit) + 3;
828 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
829 &pending_snapshot->block_rsv,
830 trans_num_items, false);
831 if (ret)
832 goto free_pending;
833
834 pending_snapshot->dentry = dentry;
835 pending_snapshot->root = root;
836 pending_snapshot->readonly = readonly;
837 pending_snapshot->dir = dir;
838 pending_snapshot->inherit = inherit;
839
840 trans = btrfs_start_transaction(root, 0);
841 if (IS_ERR(trans)) {
842 ret = PTR_ERR(trans);
843 goto fail;
844 }
845
846 trans->pending_snapshot = pending_snapshot;
847
848 ret = btrfs_commit_transaction(trans);
849 if (ret)
850 goto fail;
851
852 ret = pending_snapshot->error;
853 if (ret)
854 goto fail;
855
856 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
857 if (ret)
858 goto fail;
859
860 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
861 if (IS_ERR(inode)) {
862 ret = PTR_ERR(inode);
863 goto fail;
864 }
865
866 d_instantiate(dentry, inode);
867 ret = 0;
868 pending_snapshot->anon_dev = 0;
869fail:
870 /* Prevent double freeing of anon_dev */
871 if (ret && pending_snapshot->snap)
872 pending_snapshot->snap->anon_dev = 0;
873 btrfs_put_root(pending_snapshot->snap);
874 btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv);
875free_pending:
876 if (pending_snapshot->anon_dev)
877 free_anon_bdev(pending_snapshot->anon_dev);
878 kfree(pending_snapshot->root_item);
879 btrfs_free_path(pending_snapshot->path);
880 kfree(pending_snapshot);
881
882 return ret;
883}
884
885/* copy of may_delete in fs/namei.c()
886 * Check whether we can remove a link victim from directory dir, check
887 * whether the type of victim is right.
888 * 1. We can't do it if dir is read-only (done in permission())
889 * 2. We should have write and exec permissions on dir
890 * 3. We can't remove anything from append-only dir
891 * 4. We can't do anything with immutable dir (done in permission())
892 * 5. If the sticky bit on dir is set we should either
893 * a. be owner of dir, or
894 * b. be owner of victim, or
895 * c. have CAP_FOWNER capability
896 * 6. If the victim is append-only or immutable we can't do anything with
897 * links pointing to it.
898 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
899 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
900 * 9. We can't remove a root or mountpoint.
901 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
902 * nfs_async_unlink().
903 */
904
905static int btrfs_may_delete(struct mnt_idmap *idmap,
906 struct inode *dir, struct dentry *victim, int isdir)
907{
908 int error;
909
910 if (d_really_is_negative(victim))
911 return -ENOENT;
912
913 BUG_ON(d_inode(victim->d_parent) != dir);
914 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
915
916 error = inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC);
917 if (error)
918 return error;
919 if (IS_APPEND(dir))
920 return -EPERM;
921 if (check_sticky(idmap, dir, d_inode(victim)) ||
922 IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
923 IS_SWAPFILE(d_inode(victim)))
924 return -EPERM;
925 if (isdir) {
926 if (!d_is_dir(victim))
927 return -ENOTDIR;
928 if (IS_ROOT(victim))
929 return -EBUSY;
930 } else if (d_is_dir(victim))
931 return -EISDIR;
932 if (IS_DEADDIR(dir))
933 return -ENOENT;
934 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
935 return -EBUSY;
936 return 0;
937}
938
939/* copy of may_create in fs/namei.c() */
940static inline int btrfs_may_create(struct mnt_idmap *idmap,
941 struct inode *dir, struct dentry *child)
942{
943 if (d_really_is_positive(child))
944 return -EEXIST;
945 if (IS_DEADDIR(dir))
946 return -ENOENT;
947 if (!fsuidgid_has_mapping(dir->i_sb, idmap))
948 return -EOVERFLOW;
949 return inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC);
950}
951
952/*
953 * Create a new subvolume below @parent. This is largely modeled after
954 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
955 * inside this filesystem so it's quite a bit simpler.
956 */
957static noinline int btrfs_mksubvol(const struct path *parent,
958 struct mnt_idmap *idmap,
959 const char *name, int namelen,
960 struct btrfs_root *snap_src,
961 bool readonly,
962 struct btrfs_qgroup_inherit *inherit)
963{
964 struct inode *dir = d_inode(parent->dentry);
965 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
966 struct dentry *dentry;
967 struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen);
968 int error;
969
970 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
971 if (error == -EINTR)
972 return error;
973
974 dentry = lookup_one(idmap, name, parent->dentry, namelen);
975 error = PTR_ERR(dentry);
976 if (IS_ERR(dentry))
977 goto out_unlock;
978
979 error = btrfs_may_create(idmap, dir, dentry);
980 if (error)
981 goto out_dput;
982
983 /*
984 * even if this name doesn't exist, we may get hash collisions.
985 * check for them now when we can safely fail
986 */
987 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
988 dir->i_ino, &name_str);
989 if (error)
990 goto out_dput;
991
992 down_read(&fs_info->subvol_sem);
993
994 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
995 goto out_up_read;
996
997 if (snap_src)
998 error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
999 else
1000 error = create_subvol(idmap, dir, dentry, inherit);
1001
1002 if (!error)
1003 fsnotify_mkdir(dir, dentry);
1004out_up_read:
1005 up_read(&fs_info->subvol_sem);
1006out_dput:
1007 dput(dentry);
1008out_unlock:
1009 btrfs_inode_unlock(BTRFS_I(dir), 0);
1010 return error;
1011}
1012
1013static noinline int btrfs_mksnapshot(const struct path *parent,
1014 struct mnt_idmap *idmap,
1015 const char *name, int namelen,
1016 struct btrfs_root *root,
1017 bool readonly,
1018 struct btrfs_qgroup_inherit *inherit)
1019{
1020 int ret;
1021 bool snapshot_force_cow = false;
1022
1023 /*
1024 * Force new buffered writes to reserve space even when NOCOW is
1025 * possible. This is to avoid later writeback (running dealloc) to
1026 * fallback to COW mode and unexpectedly fail with ENOSPC.
1027 */
1028 btrfs_drew_read_lock(&root->snapshot_lock);
1029
1030 ret = btrfs_start_delalloc_snapshot(root, false);
1031 if (ret)
1032 goto out;
1033
1034 /*
1035 * All previous writes have started writeback in NOCOW mode, so now
1036 * we force future writes to fallback to COW mode during snapshot
1037 * creation.
1038 */
1039 atomic_inc(&root->snapshot_force_cow);
1040 snapshot_force_cow = true;
1041
1042 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
1043
1044 ret = btrfs_mksubvol(parent, idmap, name, namelen,
1045 root, readonly, inherit);
1046out:
1047 if (snapshot_force_cow)
1048 atomic_dec(&root->snapshot_force_cow);
1049 btrfs_drew_read_unlock(&root->snapshot_lock);
1050 return ret;
1051}
1052
1053/*
1054 * Try to start exclusive operation @type or cancel it if it's running.
1055 *
1056 * Return:
1057 * 0 - normal mode, newly claimed op started
1058 * >0 - normal mode, something else is running,
1059 * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space
1060 * ECANCELED - cancel mode, successful cancel
1061 * ENOTCONN - cancel mode, operation not running anymore
1062 */
1063static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info,
1064 enum btrfs_exclusive_operation type, bool cancel)
1065{
1066 if (!cancel) {
1067 /* Start normal op */
1068 if (!btrfs_exclop_start(fs_info, type))
1069 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1070 /* Exclusive operation is now claimed */
1071 return 0;
1072 }
1073
1074 /* Cancel running op */
1075 if (btrfs_exclop_start_try_lock(fs_info, type)) {
1076 /*
1077 * This blocks any exclop finish from setting it to NONE, so we
1078 * request cancellation. Either it runs and we will wait for it,
1079 * or it has finished and no waiting will happen.
1080 */
1081 atomic_inc(&fs_info->reloc_cancel_req);
1082 btrfs_exclop_start_unlock(fs_info);
1083
1084 if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags))
1085 wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING,
1086 TASK_INTERRUPTIBLE);
1087
1088 return -ECANCELED;
1089 }
1090
1091 /* Something else is running or none */
1092 return -ENOTCONN;
1093}
1094
1095static noinline int btrfs_ioctl_resize(struct file *file,
1096 void __user *arg)
1097{
1098 BTRFS_DEV_LOOKUP_ARGS(args);
1099 struct inode *inode = file_inode(file);
1100 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1101 u64 new_size;
1102 u64 old_size;
1103 u64 devid = 1;
1104 struct btrfs_root *root = BTRFS_I(inode)->root;
1105 struct btrfs_ioctl_vol_args *vol_args;
1106 struct btrfs_trans_handle *trans;
1107 struct btrfs_device *device = NULL;
1108 char *sizestr;
1109 char *retptr;
1110 char *devstr = NULL;
1111 int ret = 0;
1112 int mod = 0;
1113 bool cancel;
1114
1115 if (!capable(CAP_SYS_ADMIN))
1116 return -EPERM;
1117
1118 ret = mnt_want_write_file(file);
1119 if (ret)
1120 return ret;
1121
1122 /*
1123 * Read the arguments before checking exclusivity to be able to
1124 * distinguish regular resize and cancel
1125 */
1126 vol_args = memdup_user(arg, sizeof(*vol_args));
1127 if (IS_ERR(vol_args)) {
1128 ret = PTR_ERR(vol_args);
1129 goto out_drop;
1130 }
1131 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1132 sizestr = vol_args->name;
1133 cancel = (strcmp("cancel", sizestr) == 0);
1134 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel);
1135 if (ret)
1136 goto out_free;
1137 /* Exclusive operation is now claimed */
1138
1139 devstr = strchr(sizestr, ':');
1140 if (devstr) {
1141 sizestr = devstr + 1;
1142 *devstr = '\0';
1143 devstr = vol_args->name;
1144 ret = kstrtoull(devstr, 10, &devid);
1145 if (ret)
1146 goto out_finish;
1147 if (!devid) {
1148 ret = -EINVAL;
1149 goto out_finish;
1150 }
1151 btrfs_info(fs_info, "resizing devid %llu", devid);
1152 }
1153
1154 args.devid = devid;
1155 device = btrfs_find_device(fs_info->fs_devices, &args);
1156 if (!device) {
1157 btrfs_info(fs_info, "resizer unable to find device %llu",
1158 devid);
1159 ret = -ENODEV;
1160 goto out_finish;
1161 }
1162
1163 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1164 btrfs_info(fs_info,
1165 "resizer unable to apply on readonly device %llu",
1166 devid);
1167 ret = -EPERM;
1168 goto out_finish;
1169 }
1170
1171 if (!strcmp(sizestr, "max"))
1172 new_size = bdev_nr_bytes(device->bdev);
1173 else {
1174 if (sizestr[0] == '-') {
1175 mod = -1;
1176 sizestr++;
1177 } else if (sizestr[0] == '+') {
1178 mod = 1;
1179 sizestr++;
1180 }
1181 new_size = memparse(sizestr, &retptr);
1182 if (*retptr != '\0' || new_size == 0) {
1183 ret = -EINVAL;
1184 goto out_finish;
1185 }
1186 }
1187
1188 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1189 ret = -EPERM;
1190 goto out_finish;
1191 }
1192
1193 old_size = btrfs_device_get_total_bytes(device);
1194
1195 if (mod < 0) {
1196 if (new_size > old_size) {
1197 ret = -EINVAL;
1198 goto out_finish;
1199 }
1200 new_size = old_size - new_size;
1201 } else if (mod > 0) {
1202 if (new_size > ULLONG_MAX - old_size) {
1203 ret = -ERANGE;
1204 goto out_finish;
1205 }
1206 new_size = old_size + new_size;
1207 }
1208
1209 if (new_size < SZ_256M) {
1210 ret = -EINVAL;
1211 goto out_finish;
1212 }
1213 if (new_size > bdev_nr_bytes(device->bdev)) {
1214 ret = -EFBIG;
1215 goto out_finish;
1216 }
1217
1218 new_size = round_down(new_size, fs_info->sectorsize);
1219
1220 if (new_size > old_size) {
1221 trans = btrfs_start_transaction(root, 0);
1222 if (IS_ERR(trans)) {
1223 ret = PTR_ERR(trans);
1224 goto out_finish;
1225 }
1226 ret = btrfs_grow_device(trans, device, new_size);
1227 btrfs_commit_transaction(trans);
1228 } else if (new_size < old_size) {
1229 ret = btrfs_shrink_device(device, new_size);
1230 } /* equal, nothing need to do */
1231
1232 if (ret == 0 && new_size != old_size)
1233 btrfs_info_in_rcu(fs_info,
1234 "resize device %s (devid %llu) from %llu to %llu",
1235 btrfs_dev_name(device), device->devid,
1236 old_size, new_size);
1237out_finish:
1238 btrfs_exclop_finish(fs_info);
1239out_free:
1240 kfree(vol_args);
1241out_drop:
1242 mnt_drop_write_file(file);
1243 return ret;
1244}
1245
1246static noinline int __btrfs_ioctl_snap_create(struct file *file,
1247 struct mnt_idmap *idmap,
1248 const char *name, unsigned long fd, int subvol,
1249 bool readonly,
1250 struct btrfs_qgroup_inherit *inherit)
1251{
1252 int namelen;
1253 int ret = 0;
1254
1255 if (!S_ISDIR(file_inode(file)->i_mode))
1256 return -ENOTDIR;
1257
1258 ret = mnt_want_write_file(file);
1259 if (ret)
1260 goto out;
1261
1262 namelen = strlen(name);
1263 if (strchr(name, '/')) {
1264 ret = -EINVAL;
1265 goto out_drop_write;
1266 }
1267
1268 if (name[0] == '.' &&
1269 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1270 ret = -EEXIST;
1271 goto out_drop_write;
1272 }
1273
1274 if (subvol) {
1275 ret = btrfs_mksubvol(&file->f_path, idmap, name,
1276 namelen, NULL, readonly, inherit);
1277 } else {
1278 struct fd src = fdget(fd);
1279 struct inode *src_inode;
1280 if (!src.file) {
1281 ret = -EINVAL;
1282 goto out_drop_write;
1283 }
1284
1285 src_inode = file_inode(src.file);
1286 if (src_inode->i_sb != file_inode(file)->i_sb) {
1287 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1288 "Snapshot src from another FS");
1289 ret = -EXDEV;
1290 } else if (!inode_owner_or_capable(idmap, src_inode)) {
1291 /*
1292 * Subvolume creation is not restricted, but snapshots
1293 * are limited to own subvolumes only
1294 */
1295 ret = -EPERM;
1296 } else if (btrfs_ino(BTRFS_I(src_inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1297 /*
1298 * Snapshots must be made with the src_inode referring
1299 * to the subvolume inode, otherwise the permission
1300 * checking above is useless because we may have
1301 * permission on a lower directory but not the subvol
1302 * itself.
1303 */
1304 ret = -EINVAL;
1305 } else {
1306 ret = btrfs_mksnapshot(&file->f_path, idmap,
1307 name, namelen,
1308 BTRFS_I(src_inode)->root,
1309 readonly, inherit);
1310 }
1311 fdput(src);
1312 }
1313out_drop_write:
1314 mnt_drop_write_file(file);
1315out:
1316 return ret;
1317}
1318
1319static noinline int btrfs_ioctl_snap_create(struct file *file,
1320 void __user *arg, int subvol)
1321{
1322 struct btrfs_ioctl_vol_args *vol_args;
1323 int ret;
1324
1325 if (!S_ISDIR(file_inode(file)->i_mode))
1326 return -ENOTDIR;
1327
1328 vol_args = memdup_user(arg, sizeof(*vol_args));
1329 if (IS_ERR(vol_args))
1330 return PTR_ERR(vol_args);
1331 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1332
1333 ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file),
1334 vol_args->name, vol_args->fd, subvol,
1335 false, NULL);
1336
1337 kfree(vol_args);
1338 return ret;
1339}
1340
1341static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1342 void __user *arg, int subvol)
1343{
1344 struct btrfs_ioctl_vol_args_v2 *vol_args;
1345 int ret;
1346 bool readonly = false;
1347 struct btrfs_qgroup_inherit *inherit = NULL;
1348
1349 if (!S_ISDIR(file_inode(file)->i_mode))
1350 return -ENOTDIR;
1351
1352 vol_args = memdup_user(arg, sizeof(*vol_args));
1353 if (IS_ERR(vol_args))
1354 return PTR_ERR(vol_args);
1355 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1356
1357 if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
1358 ret = -EOPNOTSUPP;
1359 goto free_args;
1360 }
1361
1362 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1363 readonly = true;
1364 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1365 u64 nums;
1366
1367 if (vol_args->size < sizeof(*inherit) ||
1368 vol_args->size > PAGE_SIZE) {
1369 ret = -EINVAL;
1370 goto free_args;
1371 }
1372 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1373 if (IS_ERR(inherit)) {
1374 ret = PTR_ERR(inherit);
1375 goto free_args;
1376 }
1377
1378 if (inherit->num_qgroups > PAGE_SIZE ||
1379 inherit->num_ref_copies > PAGE_SIZE ||
1380 inherit->num_excl_copies > PAGE_SIZE) {
1381 ret = -EINVAL;
1382 goto free_inherit;
1383 }
1384
1385 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
1386 2 * inherit->num_excl_copies;
1387 if (vol_args->size != struct_size(inherit, qgroups, nums)) {
1388 ret = -EINVAL;
1389 goto free_inherit;
1390 }
1391 }
1392
1393 ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file),
1394 vol_args->name, vol_args->fd, subvol,
1395 readonly, inherit);
1396 if (ret)
1397 goto free_inherit;
1398free_inherit:
1399 kfree(inherit);
1400free_args:
1401 kfree(vol_args);
1402 return ret;
1403}
1404
1405static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode,
1406 void __user *arg)
1407{
1408 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1409 struct btrfs_root *root = BTRFS_I(inode)->root;
1410 int ret = 0;
1411 u64 flags = 0;
1412
1413 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1414 return -EINVAL;
1415
1416 down_read(&fs_info->subvol_sem);
1417 if (btrfs_root_readonly(root))
1418 flags |= BTRFS_SUBVOL_RDONLY;
1419 up_read(&fs_info->subvol_sem);
1420
1421 if (copy_to_user(arg, &flags, sizeof(flags)))
1422 ret = -EFAULT;
1423
1424 return ret;
1425}
1426
1427static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1428 void __user *arg)
1429{
1430 struct inode *inode = file_inode(file);
1431 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1432 struct btrfs_root *root = BTRFS_I(inode)->root;
1433 struct btrfs_trans_handle *trans;
1434 u64 root_flags;
1435 u64 flags;
1436 int ret = 0;
1437
1438 if (!inode_owner_or_capable(file_mnt_idmap(file), inode))
1439 return -EPERM;
1440
1441 ret = mnt_want_write_file(file);
1442 if (ret)
1443 goto out;
1444
1445 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1446 ret = -EINVAL;
1447 goto out_drop_write;
1448 }
1449
1450 if (copy_from_user(&flags, arg, sizeof(flags))) {
1451 ret = -EFAULT;
1452 goto out_drop_write;
1453 }
1454
1455 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1456 ret = -EOPNOTSUPP;
1457 goto out_drop_write;
1458 }
1459
1460 down_write(&fs_info->subvol_sem);
1461
1462 /* nothing to do */
1463 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1464 goto out_drop_sem;
1465
1466 root_flags = btrfs_root_flags(&root->root_item);
1467 if (flags & BTRFS_SUBVOL_RDONLY) {
1468 btrfs_set_root_flags(&root->root_item,
1469 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1470 } else {
1471 /*
1472 * Block RO -> RW transition if this subvolume is involved in
1473 * send
1474 */
1475 spin_lock(&root->root_item_lock);
1476 if (root->send_in_progress == 0) {
1477 btrfs_set_root_flags(&root->root_item,
1478 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1479 spin_unlock(&root->root_item_lock);
1480 } else {
1481 spin_unlock(&root->root_item_lock);
1482 btrfs_warn(fs_info,
1483 "Attempt to set subvolume %llu read-write during send",
1484 root->root_key.objectid);
1485 ret = -EPERM;
1486 goto out_drop_sem;
1487 }
1488 }
1489
1490 trans = btrfs_start_transaction(root, 1);
1491 if (IS_ERR(trans)) {
1492 ret = PTR_ERR(trans);
1493 goto out_reset;
1494 }
1495
1496 ret = btrfs_update_root(trans, fs_info->tree_root,
1497 &root->root_key, &root->root_item);
1498 if (ret < 0) {
1499 btrfs_end_transaction(trans);
1500 goto out_reset;
1501 }
1502
1503 ret = btrfs_commit_transaction(trans);
1504
1505out_reset:
1506 if (ret)
1507 btrfs_set_root_flags(&root->root_item, root_flags);
1508out_drop_sem:
1509 up_write(&fs_info->subvol_sem);
1510out_drop_write:
1511 mnt_drop_write_file(file);
1512out:
1513 return ret;
1514}
1515
1516static noinline int key_in_sk(struct btrfs_key *key,
1517 struct btrfs_ioctl_search_key *sk)
1518{
1519 struct btrfs_key test;
1520 int ret;
1521
1522 test.objectid = sk->min_objectid;
1523 test.type = sk->min_type;
1524 test.offset = sk->min_offset;
1525
1526 ret = btrfs_comp_cpu_keys(key, &test);
1527 if (ret < 0)
1528 return 0;
1529
1530 test.objectid = sk->max_objectid;
1531 test.type = sk->max_type;
1532 test.offset = sk->max_offset;
1533
1534 ret = btrfs_comp_cpu_keys(key, &test);
1535 if (ret > 0)
1536 return 0;
1537 return 1;
1538}
1539
1540static noinline int copy_to_sk(struct btrfs_path *path,
1541 struct btrfs_key *key,
1542 struct btrfs_ioctl_search_key *sk,
1543 u64 *buf_size,
1544 char __user *ubuf,
1545 unsigned long *sk_offset,
1546 int *num_found)
1547{
1548 u64 found_transid;
1549 struct extent_buffer *leaf;
1550 struct btrfs_ioctl_search_header sh;
1551 struct btrfs_key test;
1552 unsigned long item_off;
1553 unsigned long item_len;
1554 int nritems;
1555 int i;
1556 int slot;
1557 int ret = 0;
1558
1559 leaf = path->nodes[0];
1560 slot = path->slots[0];
1561 nritems = btrfs_header_nritems(leaf);
1562
1563 if (btrfs_header_generation(leaf) > sk->max_transid) {
1564 i = nritems;
1565 goto advance_key;
1566 }
1567 found_transid = btrfs_header_generation(leaf);
1568
1569 for (i = slot; i < nritems; i++) {
1570 item_off = btrfs_item_ptr_offset(leaf, i);
1571 item_len = btrfs_item_size(leaf, i);
1572
1573 btrfs_item_key_to_cpu(leaf, key, i);
1574 if (!key_in_sk(key, sk))
1575 continue;
1576
1577 if (sizeof(sh) + item_len > *buf_size) {
1578 if (*num_found) {
1579 ret = 1;
1580 goto out;
1581 }
1582
1583 /*
1584 * return one empty item back for v1, which does not
1585 * handle -EOVERFLOW
1586 */
1587
1588 *buf_size = sizeof(sh) + item_len;
1589 item_len = 0;
1590 ret = -EOVERFLOW;
1591 }
1592
1593 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1594 ret = 1;
1595 goto out;
1596 }
1597
1598 sh.objectid = key->objectid;
1599 sh.offset = key->offset;
1600 sh.type = key->type;
1601 sh.len = item_len;
1602 sh.transid = found_transid;
1603
1604 /*
1605 * Copy search result header. If we fault then loop again so we
1606 * can fault in the pages and -EFAULT there if there's a
1607 * problem. Otherwise we'll fault and then copy the buffer in
1608 * properly this next time through
1609 */
1610 if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
1611 ret = 0;
1612 goto out;
1613 }
1614
1615 *sk_offset += sizeof(sh);
1616
1617 if (item_len) {
1618 char __user *up = ubuf + *sk_offset;
1619 /*
1620 * Copy the item, same behavior as above, but reset the
1621 * * sk_offset so we copy the full thing again.
1622 */
1623 if (read_extent_buffer_to_user_nofault(leaf, up,
1624 item_off, item_len)) {
1625 ret = 0;
1626 *sk_offset -= sizeof(sh);
1627 goto out;
1628 }
1629
1630 *sk_offset += item_len;
1631 }
1632 (*num_found)++;
1633
1634 if (ret) /* -EOVERFLOW from above */
1635 goto out;
1636
1637 if (*num_found >= sk->nr_items) {
1638 ret = 1;
1639 goto out;
1640 }
1641 }
1642advance_key:
1643 ret = 0;
1644 test.objectid = sk->max_objectid;
1645 test.type = sk->max_type;
1646 test.offset = sk->max_offset;
1647 if (btrfs_comp_cpu_keys(key, &test) >= 0)
1648 ret = 1;
1649 else if (key->offset < (u64)-1)
1650 key->offset++;
1651 else if (key->type < (u8)-1) {
1652 key->offset = 0;
1653 key->type++;
1654 } else if (key->objectid < (u64)-1) {
1655 key->offset = 0;
1656 key->type = 0;
1657 key->objectid++;
1658 } else
1659 ret = 1;
1660out:
1661 /*
1662 * 0: all items from this leaf copied, continue with next
1663 * 1: * more items can be copied, but unused buffer is too small
1664 * * all items were found
1665 * Either way, it will stops the loop which iterates to the next
1666 * leaf
1667 * -EOVERFLOW: item was to large for buffer
1668 * -EFAULT: could not copy extent buffer back to userspace
1669 */
1670 return ret;
1671}
1672
1673static noinline int search_ioctl(struct inode *inode,
1674 struct btrfs_ioctl_search_key *sk,
1675 u64 *buf_size,
1676 char __user *ubuf)
1677{
1678 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
1679 struct btrfs_root *root;
1680 struct btrfs_key key;
1681 struct btrfs_path *path;
1682 int ret;
1683 int num_found = 0;
1684 unsigned long sk_offset = 0;
1685
1686 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
1687 *buf_size = sizeof(struct btrfs_ioctl_search_header);
1688 return -EOVERFLOW;
1689 }
1690
1691 path = btrfs_alloc_path();
1692 if (!path)
1693 return -ENOMEM;
1694
1695 if (sk->tree_id == 0) {
1696 /* search the root of the inode that was passed */
1697 root = btrfs_grab_root(BTRFS_I(inode)->root);
1698 } else {
1699 root = btrfs_get_fs_root(info, sk->tree_id, true);
1700 if (IS_ERR(root)) {
1701 btrfs_free_path(path);
1702 return PTR_ERR(root);
1703 }
1704 }
1705
1706 key.objectid = sk->min_objectid;
1707 key.type = sk->min_type;
1708 key.offset = sk->min_offset;
1709
1710 while (1) {
1711 ret = -EFAULT;
1712 /*
1713 * Ensure that the whole user buffer is faulted in at sub-page
1714 * granularity, otherwise the loop may live-lock.
1715 */
1716 if (fault_in_subpage_writeable(ubuf + sk_offset,
1717 *buf_size - sk_offset))
1718 break;
1719
1720 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
1721 if (ret != 0) {
1722 if (ret > 0)
1723 ret = 0;
1724 goto err;
1725 }
1726 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
1727 &sk_offset, &num_found);
1728 btrfs_release_path(path);
1729 if (ret)
1730 break;
1731
1732 }
1733 if (ret > 0)
1734 ret = 0;
1735err:
1736 sk->nr_items = num_found;
1737 btrfs_put_root(root);
1738 btrfs_free_path(path);
1739 return ret;
1740}
1741
1742static noinline int btrfs_ioctl_tree_search(struct inode *inode,
1743 void __user *argp)
1744{
1745 struct btrfs_ioctl_search_args __user *uargs = argp;
1746 struct btrfs_ioctl_search_key sk;
1747 int ret;
1748 u64 buf_size;
1749
1750 if (!capable(CAP_SYS_ADMIN))
1751 return -EPERM;
1752
1753 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
1754 return -EFAULT;
1755
1756 buf_size = sizeof(uargs->buf);
1757
1758 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
1759
1760 /*
1761 * In the origin implementation an overflow is handled by returning a
1762 * search header with a len of zero, so reset ret.
1763 */
1764 if (ret == -EOVERFLOW)
1765 ret = 0;
1766
1767 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
1768 ret = -EFAULT;
1769 return ret;
1770}
1771
1772static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode,
1773 void __user *argp)
1774{
1775 struct btrfs_ioctl_search_args_v2 __user *uarg = argp;
1776 struct btrfs_ioctl_search_args_v2 args;
1777 int ret;
1778 u64 buf_size;
1779 const u64 buf_limit = SZ_16M;
1780
1781 if (!capable(CAP_SYS_ADMIN))
1782 return -EPERM;
1783
1784 /* copy search header and buffer size */
1785 if (copy_from_user(&args, uarg, sizeof(args)))
1786 return -EFAULT;
1787
1788 buf_size = args.buf_size;
1789
1790 /* limit result size to 16MB */
1791 if (buf_size > buf_limit)
1792 buf_size = buf_limit;
1793
1794 ret = search_ioctl(inode, &args.key, &buf_size,
1795 (char __user *)(&uarg->buf[0]));
1796 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
1797 ret = -EFAULT;
1798 else if (ret == -EOVERFLOW &&
1799 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
1800 ret = -EFAULT;
1801
1802 return ret;
1803}
1804
1805/*
1806 * Search INODE_REFs to identify path name of 'dirid' directory
1807 * in a 'tree_id' tree. and sets path name to 'name'.
1808 */
1809static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1810 u64 tree_id, u64 dirid, char *name)
1811{
1812 struct btrfs_root *root;
1813 struct btrfs_key key;
1814 char *ptr;
1815 int ret = -1;
1816 int slot;
1817 int len;
1818 int total_len = 0;
1819 struct btrfs_inode_ref *iref;
1820 struct extent_buffer *l;
1821 struct btrfs_path *path;
1822
1823 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1824 name[0]='\0';
1825 return 0;
1826 }
1827
1828 path = btrfs_alloc_path();
1829 if (!path)
1830 return -ENOMEM;
1831
1832 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
1833
1834 root = btrfs_get_fs_root(info, tree_id, true);
1835 if (IS_ERR(root)) {
1836 ret = PTR_ERR(root);
1837 root = NULL;
1838 goto out;
1839 }
1840
1841 key.objectid = dirid;
1842 key.type = BTRFS_INODE_REF_KEY;
1843 key.offset = (u64)-1;
1844
1845 while (1) {
1846 ret = btrfs_search_backwards(root, &key, path);
1847 if (ret < 0)
1848 goto out;
1849 else if (ret > 0) {
1850 ret = -ENOENT;
1851 goto out;
1852 }
1853
1854 l = path->nodes[0];
1855 slot = path->slots[0];
1856
1857 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1858 len = btrfs_inode_ref_name_len(l, iref);
1859 ptr -= len + 1;
1860 total_len += len + 1;
1861 if (ptr < name) {
1862 ret = -ENAMETOOLONG;
1863 goto out;
1864 }
1865
1866 *(ptr + len) = '/';
1867 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
1868
1869 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1870 break;
1871
1872 btrfs_release_path(path);
1873 key.objectid = key.offset;
1874 key.offset = (u64)-1;
1875 dirid = key.objectid;
1876 }
1877 memmove(name, ptr, total_len);
1878 name[total_len] = '\0';
1879 ret = 0;
1880out:
1881 btrfs_put_root(root);
1882 btrfs_free_path(path);
1883 return ret;
1884}
1885
1886static int btrfs_search_path_in_tree_user(struct mnt_idmap *idmap,
1887 struct inode *inode,
1888 struct btrfs_ioctl_ino_lookup_user_args *args)
1889{
1890 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
1891 struct super_block *sb = inode->i_sb;
1892 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
1893 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
1894 u64 dirid = args->dirid;
1895 unsigned long item_off;
1896 unsigned long item_len;
1897 struct btrfs_inode_ref *iref;
1898 struct btrfs_root_ref *rref;
1899 struct btrfs_root *root = NULL;
1900 struct btrfs_path *path;
1901 struct btrfs_key key, key2;
1902 struct extent_buffer *leaf;
1903 struct inode *temp_inode;
1904 char *ptr;
1905 int slot;
1906 int len;
1907 int total_len = 0;
1908 int ret;
1909
1910 path = btrfs_alloc_path();
1911 if (!path)
1912 return -ENOMEM;
1913
1914 /*
1915 * If the bottom subvolume does not exist directly under upper_limit,
1916 * construct the path in from the bottom up.
1917 */
1918 if (dirid != upper_limit.objectid) {
1919 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
1920
1921 root = btrfs_get_fs_root(fs_info, treeid, true);
1922 if (IS_ERR(root)) {
1923 ret = PTR_ERR(root);
1924 goto out;
1925 }
1926
1927 key.objectid = dirid;
1928 key.type = BTRFS_INODE_REF_KEY;
1929 key.offset = (u64)-1;
1930 while (1) {
1931 ret = btrfs_search_backwards(root, &key, path);
1932 if (ret < 0)
1933 goto out_put;
1934 else if (ret > 0) {
1935 ret = -ENOENT;
1936 goto out_put;
1937 }
1938
1939 leaf = path->nodes[0];
1940 slot = path->slots[0];
1941
1942 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
1943 len = btrfs_inode_ref_name_len(leaf, iref);
1944 ptr -= len + 1;
1945 total_len += len + 1;
1946 if (ptr < args->path) {
1947 ret = -ENAMETOOLONG;
1948 goto out_put;
1949 }
1950
1951 *(ptr + len) = '/';
1952 read_extent_buffer(leaf, ptr,
1953 (unsigned long)(iref + 1), len);
1954
1955 /* Check the read+exec permission of this directory */
1956 ret = btrfs_previous_item(root, path, dirid,
1957 BTRFS_INODE_ITEM_KEY);
1958 if (ret < 0) {
1959 goto out_put;
1960 } else if (ret > 0) {
1961 ret = -ENOENT;
1962 goto out_put;
1963 }
1964
1965 leaf = path->nodes[0];
1966 slot = path->slots[0];
1967 btrfs_item_key_to_cpu(leaf, &key2, slot);
1968 if (key2.objectid != dirid) {
1969 ret = -ENOENT;
1970 goto out_put;
1971 }
1972
1973 /*
1974 * We don't need the path anymore, so release it and
1975 * avoid deadlocks and lockdep warnings in case
1976 * btrfs_iget() needs to lookup the inode from its root
1977 * btree and lock the same leaf.
1978 */
1979 btrfs_release_path(path);
1980 temp_inode = btrfs_iget(sb, key2.objectid, root);
1981 if (IS_ERR(temp_inode)) {
1982 ret = PTR_ERR(temp_inode);
1983 goto out_put;
1984 }
1985 ret = inode_permission(idmap, temp_inode,
1986 MAY_READ | MAY_EXEC);
1987 iput(temp_inode);
1988 if (ret) {
1989 ret = -EACCES;
1990 goto out_put;
1991 }
1992
1993 if (key.offset == upper_limit.objectid)
1994 break;
1995 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
1996 ret = -EACCES;
1997 goto out_put;
1998 }
1999
2000 key.objectid = key.offset;
2001 key.offset = (u64)-1;
2002 dirid = key.objectid;
2003 }
2004
2005 memmove(args->path, ptr, total_len);
2006 args->path[total_len] = '\0';
2007 btrfs_put_root(root);
2008 root = NULL;
2009 btrfs_release_path(path);
2010 }
2011
2012 /* Get the bottom subvolume's name from ROOT_REF */
2013 key.objectid = treeid;
2014 key.type = BTRFS_ROOT_REF_KEY;
2015 key.offset = args->treeid;
2016 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2017 if (ret < 0) {
2018 goto out;
2019 } else if (ret > 0) {
2020 ret = -ENOENT;
2021 goto out;
2022 }
2023
2024 leaf = path->nodes[0];
2025 slot = path->slots[0];
2026 btrfs_item_key_to_cpu(leaf, &key, slot);
2027
2028 item_off = btrfs_item_ptr_offset(leaf, slot);
2029 item_len = btrfs_item_size(leaf, slot);
2030 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2031 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2032 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2033 ret = -EINVAL;
2034 goto out;
2035 }
2036
2037 /* Copy subvolume's name */
2038 item_off += sizeof(struct btrfs_root_ref);
2039 item_len -= sizeof(struct btrfs_root_ref);
2040 read_extent_buffer(leaf, args->name, item_off, item_len);
2041 args->name[item_len] = 0;
2042
2043out_put:
2044 btrfs_put_root(root);
2045out:
2046 btrfs_free_path(path);
2047 return ret;
2048}
2049
2050static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root,
2051 void __user *argp)
2052{
2053 struct btrfs_ioctl_ino_lookup_args *args;
2054 int ret = 0;
2055
2056 args = memdup_user(argp, sizeof(*args));
2057 if (IS_ERR(args))
2058 return PTR_ERR(args);
2059
2060 /*
2061 * Unprivileged query to obtain the containing subvolume root id. The
2062 * path is reset so it's consistent with btrfs_search_path_in_tree.
2063 */
2064 if (args->treeid == 0)
2065 args->treeid = root->root_key.objectid;
2066
2067 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2068 args->name[0] = 0;
2069 goto out;
2070 }
2071
2072 if (!capable(CAP_SYS_ADMIN)) {
2073 ret = -EPERM;
2074 goto out;
2075 }
2076
2077 ret = btrfs_search_path_in_tree(root->fs_info,
2078 args->treeid, args->objectid,
2079 args->name);
2080
2081out:
2082 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2083 ret = -EFAULT;
2084
2085 kfree(args);
2086 return ret;
2087}
2088
2089/*
2090 * Version of ino_lookup ioctl (unprivileged)
2091 *
2092 * The main differences from ino_lookup ioctl are:
2093 *
2094 * 1. Read + Exec permission will be checked using inode_permission() during
2095 * path construction. -EACCES will be returned in case of failure.
2096 * 2. Path construction will be stopped at the inode number which corresponds
2097 * to the fd with which this ioctl is called. If constructed path does not
2098 * exist under fd's inode, -EACCES will be returned.
2099 * 3. The name of bottom subvolume is also searched and filled.
2100 */
2101static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2102{
2103 struct btrfs_ioctl_ino_lookup_user_args *args;
2104 struct inode *inode;
2105 int ret;
2106
2107 args = memdup_user(argp, sizeof(*args));
2108 if (IS_ERR(args))
2109 return PTR_ERR(args);
2110
2111 inode = file_inode(file);
2112
2113 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2114 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2115 /*
2116 * The subvolume does not exist under fd with which this is
2117 * called
2118 */
2119 kfree(args);
2120 return -EACCES;
2121 }
2122
2123 ret = btrfs_search_path_in_tree_user(file_mnt_idmap(file), inode, args);
2124
2125 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2126 ret = -EFAULT;
2127
2128 kfree(args);
2129 return ret;
2130}
2131
2132/* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2133static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp)
2134{
2135 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2136 struct btrfs_fs_info *fs_info;
2137 struct btrfs_root *root;
2138 struct btrfs_path *path;
2139 struct btrfs_key key;
2140 struct btrfs_root_item *root_item;
2141 struct btrfs_root_ref *rref;
2142 struct extent_buffer *leaf;
2143 unsigned long item_off;
2144 unsigned long item_len;
2145 int slot;
2146 int ret = 0;
2147
2148 path = btrfs_alloc_path();
2149 if (!path)
2150 return -ENOMEM;
2151
2152 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2153 if (!subvol_info) {
2154 btrfs_free_path(path);
2155 return -ENOMEM;
2156 }
2157
2158 fs_info = BTRFS_I(inode)->root->fs_info;
2159
2160 /* Get root_item of inode's subvolume */
2161 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2162 root = btrfs_get_fs_root(fs_info, key.objectid, true);
2163 if (IS_ERR(root)) {
2164 ret = PTR_ERR(root);
2165 goto out_free;
2166 }
2167 root_item = &root->root_item;
2168
2169 subvol_info->treeid = key.objectid;
2170
2171 subvol_info->generation = btrfs_root_generation(root_item);
2172 subvol_info->flags = btrfs_root_flags(root_item);
2173
2174 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2175 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2176 BTRFS_UUID_SIZE);
2177 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2178 BTRFS_UUID_SIZE);
2179
2180 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2181 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2182 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2183
2184 subvol_info->otransid = btrfs_root_otransid(root_item);
2185 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2186 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2187
2188 subvol_info->stransid = btrfs_root_stransid(root_item);
2189 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2190 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2191
2192 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2193 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2194 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2195
2196 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2197 /* Search root tree for ROOT_BACKREF of this subvolume */
2198 key.type = BTRFS_ROOT_BACKREF_KEY;
2199 key.offset = 0;
2200 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2201 if (ret < 0) {
2202 goto out;
2203 } else if (path->slots[0] >=
2204 btrfs_header_nritems(path->nodes[0])) {
2205 ret = btrfs_next_leaf(fs_info->tree_root, path);
2206 if (ret < 0) {
2207 goto out;
2208 } else if (ret > 0) {
2209 ret = -EUCLEAN;
2210 goto out;
2211 }
2212 }
2213
2214 leaf = path->nodes[0];
2215 slot = path->slots[0];
2216 btrfs_item_key_to_cpu(leaf, &key, slot);
2217 if (key.objectid == subvol_info->treeid &&
2218 key.type == BTRFS_ROOT_BACKREF_KEY) {
2219 subvol_info->parent_id = key.offset;
2220
2221 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2222 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2223
2224 item_off = btrfs_item_ptr_offset(leaf, slot)
2225 + sizeof(struct btrfs_root_ref);
2226 item_len = btrfs_item_size(leaf, slot)
2227 - sizeof(struct btrfs_root_ref);
2228 read_extent_buffer(leaf, subvol_info->name,
2229 item_off, item_len);
2230 } else {
2231 ret = -ENOENT;
2232 goto out;
2233 }
2234 }
2235
2236 btrfs_free_path(path);
2237 path = NULL;
2238 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2239 ret = -EFAULT;
2240
2241out:
2242 btrfs_put_root(root);
2243out_free:
2244 btrfs_free_path(path);
2245 kfree(subvol_info);
2246 return ret;
2247}
2248
2249/*
2250 * Return ROOT_REF information of the subvolume containing this inode
2251 * except the subvolume name.
2252 */
2253static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root,
2254 void __user *argp)
2255{
2256 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2257 struct btrfs_root_ref *rref;
2258 struct btrfs_path *path;
2259 struct btrfs_key key;
2260 struct extent_buffer *leaf;
2261 u64 objectid;
2262 int slot;
2263 int ret;
2264 u8 found;
2265
2266 path = btrfs_alloc_path();
2267 if (!path)
2268 return -ENOMEM;
2269
2270 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2271 if (IS_ERR(rootrefs)) {
2272 btrfs_free_path(path);
2273 return PTR_ERR(rootrefs);
2274 }
2275
2276 objectid = root->root_key.objectid;
2277 key.objectid = objectid;
2278 key.type = BTRFS_ROOT_REF_KEY;
2279 key.offset = rootrefs->min_treeid;
2280 found = 0;
2281
2282 root = root->fs_info->tree_root;
2283 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2284 if (ret < 0) {
2285 goto out;
2286 } else if (path->slots[0] >=
2287 btrfs_header_nritems(path->nodes[0])) {
2288 ret = btrfs_next_leaf(root, path);
2289 if (ret < 0) {
2290 goto out;
2291 } else if (ret > 0) {
2292 ret = -EUCLEAN;
2293 goto out;
2294 }
2295 }
2296 while (1) {
2297 leaf = path->nodes[0];
2298 slot = path->slots[0];
2299
2300 btrfs_item_key_to_cpu(leaf, &key, slot);
2301 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2302 ret = 0;
2303 goto out;
2304 }
2305
2306 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2307 ret = -EOVERFLOW;
2308 goto out;
2309 }
2310
2311 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2312 rootrefs->rootref[found].treeid = key.offset;
2313 rootrefs->rootref[found].dirid =
2314 btrfs_root_ref_dirid(leaf, rref);
2315 found++;
2316
2317 ret = btrfs_next_item(root, path);
2318 if (ret < 0) {
2319 goto out;
2320 } else if (ret > 0) {
2321 ret = -EUCLEAN;
2322 goto out;
2323 }
2324 }
2325
2326out:
2327 btrfs_free_path(path);
2328
2329 if (!ret || ret == -EOVERFLOW) {
2330 rootrefs->num_items = found;
2331 /* update min_treeid for next search */
2332 if (found)
2333 rootrefs->min_treeid =
2334 rootrefs->rootref[found - 1].treeid + 1;
2335 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2336 ret = -EFAULT;
2337 }
2338
2339 kfree(rootrefs);
2340
2341 return ret;
2342}
2343
2344static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2345 void __user *arg,
2346 bool destroy_v2)
2347{
2348 struct dentry *parent = file->f_path.dentry;
2349 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2350 struct dentry *dentry;
2351 struct inode *dir = d_inode(parent);
2352 struct inode *inode;
2353 struct btrfs_root *root = BTRFS_I(dir)->root;
2354 struct btrfs_root *dest = NULL;
2355 struct btrfs_ioctl_vol_args *vol_args = NULL;
2356 struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
2357 struct mnt_idmap *idmap = file_mnt_idmap(file);
2358 char *subvol_name, *subvol_name_ptr = NULL;
2359 int subvol_namelen;
2360 int err = 0;
2361 bool destroy_parent = false;
2362
2363 /* We don't support snapshots with extent tree v2 yet. */
2364 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2365 btrfs_err(fs_info,
2366 "extent tree v2 doesn't support snapshot deletion yet");
2367 return -EOPNOTSUPP;
2368 }
2369
2370 if (destroy_v2) {
2371 vol_args2 = memdup_user(arg, sizeof(*vol_args2));
2372 if (IS_ERR(vol_args2))
2373 return PTR_ERR(vol_args2);
2374
2375 if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
2376 err = -EOPNOTSUPP;
2377 goto out;
2378 }
2379
2380 /*
2381 * If SPEC_BY_ID is not set, we are looking for the subvolume by
2382 * name, same as v1 currently does.
2383 */
2384 if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
2385 vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0;
2386 subvol_name = vol_args2->name;
2387
2388 err = mnt_want_write_file(file);
2389 if (err)
2390 goto out;
2391 } else {
2392 struct inode *old_dir;
2393
2394 if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
2395 err = -EINVAL;
2396 goto out;
2397 }
2398
2399 err = mnt_want_write_file(file);
2400 if (err)
2401 goto out;
2402
2403 dentry = btrfs_get_dentry(fs_info->sb,
2404 BTRFS_FIRST_FREE_OBJECTID,
2405 vol_args2->subvolid, 0);
2406 if (IS_ERR(dentry)) {
2407 err = PTR_ERR(dentry);
2408 goto out_drop_write;
2409 }
2410
2411 /*
2412 * Change the default parent since the subvolume being
2413 * deleted can be outside of the current mount point.
2414 */
2415 parent = btrfs_get_parent(dentry);
2416
2417 /*
2418 * At this point dentry->d_name can point to '/' if the
2419 * subvolume we want to destroy is outsite of the
2420 * current mount point, so we need to release the
2421 * current dentry and execute the lookup to return a new
2422 * one with ->d_name pointing to the
2423 * <mount point>/subvol_name.
2424 */
2425 dput(dentry);
2426 if (IS_ERR(parent)) {
2427 err = PTR_ERR(parent);
2428 goto out_drop_write;
2429 }
2430 old_dir = dir;
2431 dir = d_inode(parent);
2432
2433 /*
2434 * If v2 was used with SPEC_BY_ID, a new parent was
2435 * allocated since the subvolume can be outside of the
2436 * current mount point. Later on we need to release this
2437 * new parent dentry.
2438 */
2439 destroy_parent = true;
2440
2441 /*
2442 * On idmapped mounts, deletion via subvolid is
2443 * restricted to subvolumes that are immediate
2444 * ancestors of the inode referenced by the file
2445 * descriptor in the ioctl. Otherwise the idmapping
2446 * could potentially be abused to delete subvolumes
2447 * anywhere in the filesystem the user wouldn't be able
2448 * to delete without an idmapped mount.
2449 */
2450 if (old_dir != dir && idmap != &nop_mnt_idmap) {
2451 err = -EOPNOTSUPP;
2452 goto free_parent;
2453 }
2454
2455 subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
2456 fs_info, vol_args2->subvolid);
2457 if (IS_ERR(subvol_name_ptr)) {
2458 err = PTR_ERR(subvol_name_ptr);
2459 goto free_parent;
2460 }
2461 /* subvol_name_ptr is already nul terminated */
2462 subvol_name = (char *)kbasename(subvol_name_ptr);
2463 }
2464 } else {
2465 vol_args = memdup_user(arg, sizeof(*vol_args));
2466 if (IS_ERR(vol_args))
2467 return PTR_ERR(vol_args);
2468
2469 vol_args->name[BTRFS_PATH_NAME_MAX] = 0;
2470 subvol_name = vol_args->name;
2471
2472 err = mnt_want_write_file(file);
2473 if (err)
2474 goto out;
2475 }
2476
2477 subvol_namelen = strlen(subvol_name);
2478
2479 if (strchr(subvol_name, '/') ||
2480 strncmp(subvol_name, "..", subvol_namelen) == 0) {
2481 err = -EINVAL;
2482 goto free_subvol_name;
2483 }
2484
2485 if (!S_ISDIR(dir->i_mode)) {
2486 err = -ENOTDIR;
2487 goto free_subvol_name;
2488 }
2489
2490 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2491 if (err == -EINTR)
2492 goto free_subvol_name;
2493 dentry = lookup_one(idmap, subvol_name, parent, subvol_namelen);
2494 if (IS_ERR(dentry)) {
2495 err = PTR_ERR(dentry);
2496 goto out_unlock_dir;
2497 }
2498
2499 if (d_really_is_negative(dentry)) {
2500 err = -ENOENT;
2501 goto out_dput;
2502 }
2503
2504 inode = d_inode(dentry);
2505 dest = BTRFS_I(inode)->root;
2506 if (!capable(CAP_SYS_ADMIN)) {
2507 /*
2508 * Regular user. Only allow this with a special mount
2509 * option, when the user has write+exec access to the
2510 * subvol root, and when rmdir(2) would have been
2511 * allowed.
2512 *
2513 * Note that this is _not_ check that the subvol is
2514 * empty or doesn't contain data that we wouldn't
2515 * otherwise be able to delete.
2516 *
2517 * Users who want to delete empty subvols should try
2518 * rmdir(2).
2519 */
2520 err = -EPERM;
2521 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2522 goto out_dput;
2523
2524 /*
2525 * Do not allow deletion if the parent dir is the same
2526 * as the dir to be deleted. That means the ioctl
2527 * must be called on the dentry referencing the root
2528 * of the subvol, not a random directory contained
2529 * within it.
2530 */
2531 err = -EINVAL;
2532 if (root == dest)
2533 goto out_dput;
2534
2535 err = inode_permission(idmap, inode, MAY_WRITE | MAY_EXEC);
2536 if (err)
2537 goto out_dput;
2538 }
2539
2540 /* check if subvolume may be deleted by a user */
2541 err = btrfs_may_delete(idmap, dir, dentry, 1);
2542 if (err)
2543 goto out_dput;
2544
2545 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2546 err = -EINVAL;
2547 goto out_dput;
2548 }
2549
2550 btrfs_inode_lock(BTRFS_I(inode), 0);
2551 err = btrfs_delete_subvolume(BTRFS_I(dir), dentry);
2552 btrfs_inode_unlock(BTRFS_I(inode), 0);
2553 if (!err)
2554 d_delete_notify(dir, dentry);
2555
2556out_dput:
2557 dput(dentry);
2558out_unlock_dir:
2559 btrfs_inode_unlock(BTRFS_I(dir), 0);
2560free_subvol_name:
2561 kfree(subvol_name_ptr);
2562free_parent:
2563 if (destroy_parent)
2564 dput(parent);
2565out_drop_write:
2566 mnt_drop_write_file(file);
2567out:
2568 kfree(vol_args2);
2569 kfree(vol_args);
2570 return err;
2571}
2572
2573static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2574{
2575 struct inode *inode = file_inode(file);
2576 struct btrfs_root *root = BTRFS_I(inode)->root;
2577 struct btrfs_ioctl_defrag_range_args range = {0};
2578 int ret;
2579
2580 ret = mnt_want_write_file(file);
2581 if (ret)
2582 return ret;
2583
2584 if (btrfs_root_readonly(root)) {
2585 ret = -EROFS;
2586 goto out;
2587 }
2588
2589 switch (inode->i_mode & S_IFMT) {
2590 case S_IFDIR:
2591 if (!capable(CAP_SYS_ADMIN)) {
2592 ret = -EPERM;
2593 goto out;
2594 }
2595 ret = btrfs_defrag_root(root);
2596 break;
2597 case S_IFREG:
2598 /*
2599 * Note that this does not check the file descriptor for write
2600 * access. This prevents defragmenting executables that are
2601 * running and allows defrag on files open in read-only mode.
2602 */
2603 if (!capable(CAP_SYS_ADMIN) &&
2604 inode_permission(&nop_mnt_idmap, inode, MAY_WRITE)) {
2605 ret = -EPERM;
2606 goto out;
2607 }
2608
2609 if (argp) {
2610 if (copy_from_user(&range, argp, sizeof(range))) {
2611 ret = -EFAULT;
2612 goto out;
2613 }
2614 if (range.flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) {
2615 ret = -EOPNOTSUPP;
2616 goto out;
2617 }
2618 /* compression requires us to start the IO */
2619 if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2620 range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
2621 range.extent_thresh = (u32)-1;
2622 }
2623 } else {
2624 /* the rest are all set to zero by kzalloc */
2625 range.len = (u64)-1;
2626 }
2627 ret = btrfs_defrag_file(file_inode(file), &file->f_ra,
2628 &range, BTRFS_OLDEST_GENERATION, 0);
2629 if (ret > 0)
2630 ret = 0;
2631 break;
2632 default:
2633 ret = -EINVAL;
2634 }
2635out:
2636 mnt_drop_write_file(file);
2637 return ret;
2638}
2639
2640static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
2641{
2642 struct btrfs_ioctl_vol_args *vol_args;
2643 bool restore_op = false;
2644 int ret;
2645
2646 if (!capable(CAP_SYS_ADMIN))
2647 return -EPERM;
2648
2649 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2650 btrfs_err(fs_info, "device add not supported on extent tree v2 yet");
2651 return -EINVAL;
2652 }
2653
2654 if (fs_info->fs_devices->temp_fsid) {
2655 btrfs_err(fs_info,
2656 "device add not supported on cloned temp-fsid mount");
2657 return -EINVAL;
2658 }
2659
2660 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) {
2661 if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD))
2662 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2663
2664 /*
2665 * We can do the device add because we have a paused balanced,
2666 * change the exclusive op type and remember we should bring
2667 * back the paused balance
2668 */
2669 fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD;
2670 btrfs_exclop_start_unlock(fs_info);
2671 restore_op = true;
2672 }
2673
2674 vol_args = memdup_user(arg, sizeof(*vol_args));
2675 if (IS_ERR(vol_args)) {
2676 ret = PTR_ERR(vol_args);
2677 goto out;
2678 }
2679
2680 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2681 ret = btrfs_init_new_device(fs_info, vol_args->name);
2682
2683 if (!ret)
2684 btrfs_info(fs_info, "disk added %s", vol_args->name);
2685
2686 kfree(vol_args);
2687out:
2688 if (restore_op)
2689 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);
2690 else
2691 btrfs_exclop_finish(fs_info);
2692 return ret;
2693}
2694
2695static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
2696{
2697 BTRFS_DEV_LOOKUP_ARGS(args);
2698 struct inode *inode = file_inode(file);
2699 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2700 struct btrfs_ioctl_vol_args_v2 *vol_args;
2701 struct bdev_handle *bdev_handle = NULL;
2702 int ret;
2703 bool cancel = false;
2704
2705 if (!capable(CAP_SYS_ADMIN))
2706 return -EPERM;
2707
2708 vol_args = memdup_user(arg, sizeof(*vol_args));
2709 if (IS_ERR(vol_args))
2710 return PTR_ERR(vol_args);
2711
2712 if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
2713 ret = -EOPNOTSUPP;
2714 goto out;
2715 }
2716
2717 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
2718 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
2719 args.devid = vol_args->devid;
2720 } else if (!strcmp("cancel", vol_args->name)) {
2721 cancel = true;
2722 } else {
2723 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2724 if (ret)
2725 goto out;
2726 }
2727
2728 ret = mnt_want_write_file(file);
2729 if (ret)
2730 goto out;
2731
2732 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2733 cancel);
2734 if (ret)
2735 goto err_drop;
2736
2737 /* Exclusive operation is now claimed */
2738 ret = btrfs_rm_device(fs_info, &args, &bdev_handle);
2739
2740 btrfs_exclop_finish(fs_info);
2741
2742 if (!ret) {
2743 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
2744 btrfs_info(fs_info, "device deleted: id %llu",
2745 vol_args->devid);
2746 else
2747 btrfs_info(fs_info, "device deleted: %s",
2748 vol_args->name);
2749 }
2750err_drop:
2751 mnt_drop_write_file(file);
2752 if (bdev_handle)
2753 bdev_release(bdev_handle);
2754out:
2755 btrfs_put_dev_args_from_path(&args);
2756 kfree(vol_args);
2757 return ret;
2758}
2759
2760static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2761{
2762 BTRFS_DEV_LOOKUP_ARGS(args);
2763 struct inode *inode = file_inode(file);
2764 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2765 struct btrfs_ioctl_vol_args *vol_args;
2766 struct bdev_handle *bdev_handle = NULL;
2767 int ret;
2768 bool cancel = false;
2769
2770 if (!capable(CAP_SYS_ADMIN))
2771 return -EPERM;
2772
2773 vol_args = memdup_user(arg, sizeof(*vol_args));
2774 if (IS_ERR(vol_args))
2775 return PTR_ERR(vol_args);
2776
2777 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2778 if (!strcmp("cancel", vol_args->name)) {
2779 cancel = true;
2780 } else {
2781 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2782 if (ret)
2783 goto out;
2784 }
2785
2786 ret = mnt_want_write_file(file);
2787 if (ret)
2788 goto out;
2789
2790 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2791 cancel);
2792 if (ret == 0) {
2793 ret = btrfs_rm_device(fs_info, &args, &bdev_handle);
2794 if (!ret)
2795 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
2796 btrfs_exclop_finish(fs_info);
2797 }
2798
2799 mnt_drop_write_file(file);
2800 if (bdev_handle)
2801 bdev_release(bdev_handle);
2802out:
2803 btrfs_put_dev_args_from_path(&args);
2804 kfree(vol_args);
2805 return ret;
2806}
2807
2808static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
2809 void __user *arg)
2810{
2811 struct btrfs_ioctl_fs_info_args *fi_args;
2812 struct btrfs_device *device;
2813 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2814 u64 flags_in;
2815 int ret = 0;
2816
2817 fi_args = memdup_user(arg, sizeof(*fi_args));
2818 if (IS_ERR(fi_args))
2819 return PTR_ERR(fi_args);
2820
2821 flags_in = fi_args->flags;
2822 memset(fi_args, 0, sizeof(*fi_args));
2823
2824 rcu_read_lock();
2825 fi_args->num_devices = fs_devices->num_devices;
2826
2827 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
2828 if (device->devid > fi_args->max_id)
2829 fi_args->max_id = device->devid;
2830 }
2831 rcu_read_unlock();
2832
2833 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
2834 fi_args->nodesize = fs_info->nodesize;
2835 fi_args->sectorsize = fs_info->sectorsize;
2836 fi_args->clone_alignment = fs_info->sectorsize;
2837
2838 if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
2839 fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
2840 fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
2841 fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
2842 }
2843
2844 if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
2845 fi_args->generation = btrfs_get_fs_generation(fs_info);
2846 fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
2847 }
2848
2849 if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
2850 memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
2851 sizeof(fi_args->metadata_uuid));
2852 fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
2853 }
2854
2855 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2856 ret = -EFAULT;
2857
2858 kfree(fi_args);
2859 return ret;
2860}
2861
2862static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
2863 void __user *arg)
2864{
2865 BTRFS_DEV_LOOKUP_ARGS(args);
2866 struct btrfs_ioctl_dev_info_args *di_args;
2867 struct btrfs_device *dev;
2868 int ret = 0;
2869
2870 di_args = memdup_user(arg, sizeof(*di_args));
2871 if (IS_ERR(di_args))
2872 return PTR_ERR(di_args);
2873
2874 args.devid = di_args->devid;
2875 if (!btrfs_is_empty_uuid(di_args->uuid))
2876 args.uuid = di_args->uuid;
2877
2878 rcu_read_lock();
2879 dev = btrfs_find_device(fs_info->fs_devices, &args);
2880 if (!dev) {
2881 ret = -ENODEV;
2882 goto out;
2883 }
2884
2885 di_args->devid = dev->devid;
2886 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2887 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
2888 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2889 memcpy(di_args->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
2890 if (dev->name)
2891 strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path));
2892 else
2893 di_args->path[0] = '\0';
2894
2895out:
2896 rcu_read_unlock();
2897 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2898 ret = -EFAULT;
2899
2900 kfree(di_args);
2901 return ret;
2902}
2903
2904static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2905{
2906 struct inode *inode = file_inode(file);
2907 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2908 struct btrfs_root *root = BTRFS_I(inode)->root;
2909 struct btrfs_root *new_root;
2910 struct btrfs_dir_item *di;
2911 struct btrfs_trans_handle *trans;
2912 struct btrfs_path *path = NULL;
2913 struct btrfs_disk_key disk_key;
2914 struct fscrypt_str name = FSTR_INIT("default", 7);
2915 u64 objectid = 0;
2916 u64 dir_id;
2917 int ret;
2918
2919 if (!capable(CAP_SYS_ADMIN))
2920 return -EPERM;
2921
2922 ret = mnt_want_write_file(file);
2923 if (ret)
2924 return ret;
2925
2926 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2927 ret = -EFAULT;
2928 goto out;
2929 }
2930
2931 if (!objectid)
2932 objectid = BTRFS_FS_TREE_OBJECTID;
2933
2934 new_root = btrfs_get_fs_root(fs_info, objectid, true);
2935 if (IS_ERR(new_root)) {
2936 ret = PTR_ERR(new_root);
2937 goto out;
2938 }
2939 if (!is_fstree(new_root->root_key.objectid)) {
2940 ret = -ENOENT;
2941 goto out_free;
2942 }
2943
2944 path = btrfs_alloc_path();
2945 if (!path) {
2946 ret = -ENOMEM;
2947 goto out_free;
2948 }
2949
2950 trans = btrfs_start_transaction(root, 1);
2951 if (IS_ERR(trans)) {
2952 ret = PTR_ERR(trans);
2953 goto out_free;
2954 }
2955
2956 dir_id = btrfs_super_root_dir(fs_info->super_copy);
2957 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
2958 dir_id, &name, 1);
2959 if (IS_ERR_OR_NULL(di)) {
2960 btrfs_release_path(path);
2961 btrfs_end_transaction(trans);
2962 btrfs_err(fs_info,
2963 "Umm, you don't have the default diritem, this isn't going to work");
2964 ret = -ENOENT;
2965 goto out_free;
2966 }
2967
2968 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2969 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2970 btrfs_mark_buffer_dirty(trans, path->nodes[0]);
2971 btrfs_release_path(path);
2972
2973 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
2974 btrfs_end_transaction(trans);
2975out_free:
2976 btrfs_put_root(new_root);
2977 btrfs_free_path(path);
2978out:
2979 mnt_drop_write_file(file);
2980 return ret;
2981}
2982
2983static void get_block_group_info(struct list_head *groups_list,
2984 struct btrfs_ioctl_space_info *space)
2985{
2986 struct btrfs_block_group *block_group;
2987
2988 space->total_bytes = 0;
2989 space->used_bytes = 0;
2990 space->flags = 0;
2991 list_for_each_entry(block_group, groups_list, list) {
2992 space->flags = block_group->flags;
2993 space->total_bytes += block_group->length;
2994 space->used_bytes += block_group->used;
2995 }
2996}
2997
2998static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
2999 void __user *arg)
3000{
3001 struct btrfs_ioctl_space_args space_args = { 0 };
3002 struct btrfs_ioctl_space_info space;
3003 struct btrfs_ioctl_space_info *dest;
3004 struct btrfs_ioctl_space_info *dest_orig;
3005 struct btrfs_ioctl_space_info __user *user_dest;
3006 struct btrfs_space_info *info;
3007 static const u64 types[] = {
3008 BTRFS_BLOCK_GROUP_DATA,
3009 BTRFS_BLOCK_GROUP_SYSTEM,
3010 BTRFS_BLOCK_GROUP_METADATA,
3011 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
3012 };
3013 int num_types = 4;
3014 int alloc_size;
3015 int ret = 0;
3016 u64 slot_count = 0;
3017 int i, c;
3018
3019 if (copy_from_user(&space_args,
3020 (struct btrfs_ioctl_space_args __user *)arg,
3021 sizeof(space_args)))
3022 return -EFAULT;
3023
3024 for (i = 0; i < num_types; i++) {
3025 struct btrfs_space_info *tmp;
3026
3027 info = NULL;
3028 list_for_each_entry(tmp, &fs_info->space_info, list) {
3029 if (tmp->flags == types[i]) {
3030 info = tmp;
3031 break;
3032 }
3033 }
3034
3035 if (!info)
3036 continue;
3037
3038 down_read(&info->groups_sem);
3039 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3040 if (!list_empty(&info->block_groups[c]))
3041 slot_count++;
3042 }
3043 up_read(&info->groups_sem);
3044 }
3045
3046 /*
3047 * Global block reserve, exported as a space_info
3048 */
3049 slot_count++;
3050
3051 /* space_slots == 0 means they are asking for a count */
3052 if (space_args.space_slots == 0) {
3053 space_args.total_spaces = slot_count;
3054 goto out;
3055 }
3056
3057 slot_count = min_t(u64, space_args.space_slots, slot_count);
3058
3059 alloc_size = sizeof(*dest) * slot_count;
3060
3061 /* we generally have at most 6 or so space infos, one for each raid
3062 * level. So, a whole page should be more than enough for everyone
3063 */
3064 if (alloc_size > PAGE_SIZE)
3065 return -ENOMEM;
3066
3067 space_args.total_spaces = 0;
3068 dest = kmalloc(alloc_size, GFP_KERNEL);
3069 if (!dest)
3070 return -ENOMEM;
3071 dest_orig = dest;
3072
3073 /* now we have a buffer to copy into */
3074 for (i = 0; i < num_types; i++) {
3075 struct btrfs_space_info *tmp;
3076
3077 if (!slot_count)
3078 break;
3079
3080 info = NULL;
3081 list_for_each_entry(tmp, &fs_info->space_info, list) {
3082 if (tmp->flags == types[i]) {
3083 info = tmp;
3084 break;
3085 }
3086 }
3087
3088 if (!info)
3089 continue;
3090 down_read(&info->groups_sem);
3091 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3092 if (!list_empty(&info->block_groups[c])) {
3093 get_block_group_info(&info->block_groups[c],
3094 &space);
3095 memcpy(dest, &space, sizeof(space));
3096 dest++;
3097 space_args.total_spaces++;
3098 slot_count--;
3099 }
3100 if (!slot_count)
3101 break;
3102 }
3103 up_read(&info->groups_sem);
3104 }
3105
3106 /*
3107 * Add global block reserve
3108 */
3109 if (slot_count) {
3110 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
3111
3112 spin_lock(&block_rsv->lock);
3113 space.total_bytes = block_rsv->size;
3114 space.used_bytes = block_rsv->size - block_rsv->reserved;
3115 spin_unlock(&block_rsv->lock);
3116 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3117 memcpy(dest, &space, sizeof(space));
3118 space_args.total_spaces++;
3119 }
3120
3121 user_dest = (struct btrfs_ioctl_space_info __user *)
3122 (arg + sizeof(struct btrfs_ioctl_space_args));
3123
3124 if (copy_to_user(user_dest, dest_orig, alloc_size))
3125 ret = -EFAULT;
3126
3127 kfree(dest_orig);
3128out:
3129 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3130 ret = -EFAULT;
3131
3132 return ret;
3133}
3134
3135static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3136 void __user *argp)
3137{
3138 struct btrfs_trans_handle *trans;
3139 u64 transid;
3140
3141 /*
3142 * Start orphan cleanup here for the given root in case it hasn't been
3143 * started already by other means. Errors are handled in the other
3144 * functions during transaction commit.
3145 */
3146 btrfs_orphan_cleanup(root);
3147
3148 trans = btrfs_attach_transaction_barrier(root);
3149 if (IS_ERR(trans)) {
3150 if (PTR_ERR(trans) != -ENOENT)
3151 return PTR_ERR(trans);
3152
3153 /* No running transaction, don't bother */
3154 transid = btrfs_get_last_trans_committed(root->fs_info);
3155 goto out;
3156 }
3157 transid = trans->transid;
3158 btrfs_commit_transaction_async(trans);
3159out:
3160 if (argp)
3161 if (copy_to_user(argp, &transid, sizeof(transid)))
3162 return -EFAULT;
3163 return 0;
3164}
3165
3166static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
3167 void __user *argp)
3168{
3169 /* By default wait for the current transaction. */
3170 u64 transid = 0;
3171
3172 if (argp)
3173 if (copy_from_user(&transid, argp, sizeof(transid)))
3174 return -EFAULT;
3175
3176 return btrfs_wait_for_commit(fs_info, transid);
3177}
3178
3179static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3180{
3181 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
3182 struct btrfs_ioctl_scrub_args *sa;
3183 int ret;
3184
3185 if (!capable(CAP_SYS_ADMIN))
3186 return -EPERM;
3187
3188 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3189 btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet");
3190 return -EINVAL;
3191 }
3192
3193 sa = memdup_user(arg, sizeof(*sa));
3194 if (IS_ERR(sa))
3195 return PTR_ERR(sa);
3196
3197 if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) {
3198 ret = -EOPNOTSUPP;
3199 goto out;
3200 }
3201
3202 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3203 ret = mnt_want_write_file(file);
3204 if (ret)
3205 goto out;
3206 }
3207
3208 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
3209 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3210 0);
3211
3212 /*
3213 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
3214 * error. This is important as it allows user space to know how much
3215 * progress scrub has done. For example, if scrub is canceled we get
3216 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
3217 * space. Later user space can inspect the progress from the structure
3218 * btrfs_ioctl_scrub_args and resume scrub from where it left off
3219 * previously (btrfs-progs does this).
3220 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
3221 * then return -EFAULT to signal the structure was not copied or it may
3222 * be corrupt and unreliable due to a partial copy.
3223 */
3224 if (copy_to_user(arg, sa, sizeof(*sa)))
3225 ret = -EFAULT;
3226
3227 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3228 mnt_drop_write_file(file);
3229out:
3230 kfree(sa);
3231 return ret;
3232}
3233
3234static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
3235{
3236 if (!capable(CAP_SYS_ADMIN))
3237 return -EPERM;
3238
3239 return btrfs_scrub_cancel(fs_info);
3240}
3241
3242static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
3243 void __user *arg)
3244{
3245 struct btrfs_ioctl_scrub_args *sa;
3246 int ret;
3247
3248 if (!capable(CAP_SYS_ADMIN))
3249 return -EPERM;
3250
3251 sa = memdup_user(arg, sizeof(*sa));
3252 if (IS_ERR(sa))
3253 return PTR_ERR(sa);
3254
3255 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
3256
3257 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3258 ret = -EFAULT;
3259
3260 kfree(sa);
3261 return ret;
3262}
3263
3264static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
3265 void __user *arg)
3266{
3267 struct btrfs_ioctl_get_dev_stats *sa;
3268 int ret;
3269
3270 sa = memdup_user(arg, sizeof(*sa));
3271 if (IS_ERR(sa))
3272 return PTR_ERR(sa);
3273
3274 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3275 kfree(sa);
3276 return -EPERM;
3277 }
3278
3279 ret = btrfs_get_dev_stats(fs_info, sa);
3280
3281 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3282 ret = -EFAULT;
3283
3284 kfree(sa);
3285 return ret;
3286}
3287
3288static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
3289 void __user *arg)
3290{
3291 struct btrfs_ioctl_dev_replace_args *p;
3292 int ret;
3293
3294 if (!capable(CAP_SYS_ADMIN))
3295 return -EPERM;
3296
3297 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3298 btrfs_err(fs_info, "device replace not supported on extent tree v2 yet");
3299 return -EINVAL;
3300 }
3301
3302 p = memdup_user(arg, sizeof(*p));
3303 if (IS_ERR(p))
3304 return PTR_ERR(p);
3305
3306 switch (p->cmd) {
3307 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3308 if (sb_rdonly(fs_info->sb)) {
3309 ret = -EROFS;
3310 goto out;
3311 }
3312 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
3313 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3314 } else {
3315 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
3316 btrfs_exclop_finish(fs_info);
3317 }
3318 break;
3319 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3320 btrfs_dev_replace_status(fs_info, p);
3321 ret = 0;
3322 break;
3323 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3324 p->result = btrfs_dev_replace_cancel(fs_info);
3325 ret = 0;
3326 break;
3327 default:
3328 ret = -EINVAL;
3329 break;
3330 }
3331
3332 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3333 ret = -EFAULT;
3334out:
3335 kfree(p);
3336 return ret;
3337}
3338
3339static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3340{
3341 int ret = 0;
3342 int i;
3343 u64 rel_ptr;
3344 int size;
3345 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3346 struct inode_fs_paths *ipath = NULL;
3347 struct btrfs_path *path;
3348
3349 if (!capable(CAP_DAC_READ_SEARCH))
3350 return -EPERM;
3351
3352 path = btrfs_alloc_path();
3353 if (!path) {
3354 ret = -ENOMEM;
3355 goto out;
3356 }
3357
3358 ipa = memdup_user(arg, sizeof(*ipa));
3359 if (IS_ERR(ipa)) {
3360 ret = PTR_ERR(ipa);
3361 ipa = NULL;
3362 goto out;
3363 }
3364
3365 size = min_t(u32, ipa->size, 4096);
3366 ipath = init_ipath(size, root, path);
3367 if (IS_ERR(ipath)) {
3368 ret = PTR_ERR(ipath);
3369 ipath = NULL;
3370 goto out;
3371 }
3372
3373 ret = paths_from_inode(ipa->inum, ipath);
3374 if (ret < 0)
3375 goto out;
3376
3377 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3378 rel_ptr = ipath->fspath->val[i] -
3379 (u64)(unsigned long)ipath->fspath->val;
3380 ipath->fspath->val[i] = rel_ptr;
3381 }
3382
3383 btrfs_free_path(path);
3384 path = NULL;
3385 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
3386 ipath->fspath, size);
3387 if (ret) {
3388 ret = -EFAULT;
3389 goto out;
3390 }
3391
3392out:
3393 btrfs_free_path(path);
3394 free_ipath(ipath);
3395 kfree(ipa);
3396
3397 return ret;
3398}
3399
3400static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
3401 void __user *arg, int version)
3402{
3403 int ret = 0;
3404 int size;
3405 struct btrfs_ioctl_logical_ino_args *loi;
3406 struct btrfs_data_container *inodes = NULL;
3407 struct btrfs_path *path = NULL;
3408 bool ignore_offset;
3409
3410 if (!capable(CAP_SYS_ADMIN))
3411 return -EPERM;
3412
3413 loi = memdup_user(arg, sizeof(*loi));
3414 if (IS_ERR(loi))
3415 return PTR_ERR(loi);
3416
3417 if (version == 1) {
3418 ignore_offset = false;
3419 size = min_t(u32, loi->size, SZ_64K);
3420 } else {
3421 /* All reserved bits must be 0 for now */
3422 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
3423 ret = -EINVAL;
3424 goto out_loi;
3425 }
3426 /* Only accept flags we have defined so far */
3427 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
3428 ret = -EINVAL;
3429 goto out_loi;
3430 }
3431 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
3432 size = min_t(u32, loi->size, SZ_16M);
3433 }
3434
3435 inodes = init_data_container(size);
3436 if (IS_ERR(inodes)) {
3437 ret = PTR_ERR(inodes);
3438 goto out_loi;
3439 }
3440
3441 path = btrfs_alloc_path();
3442 if (!path) {
3443 ret = -ENOMEM;
3444 goto out;
3445 }
3446 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
3447 inodes, ignore_offset);
3448 btrfs_free_path(path);
3449 if (ret == -EINVAL)
3450 ret = -ENOENT;
3451 if (ret < 0)
3452 goto out;
3453
3454 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
3455 size);
3456 if (ret)
3457 ret = -EFAULT;
3458
3459out:
3460 kvfree(inodes);
3461out_loi:
3462 kfree(loi);
3463
3464 return ret;
3465}
3466
3467void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3468 struct btrfs_ioctl_balance_args *bargs)
3469{
3470 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3471
3472 bargs->flags = bctl->flags;
3473
3474 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
3475 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3476 if (atomic_read(&fs_info->balance_pause_req))
3477 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3478 if (atomic_read(&fs_info->balance_cancel_req))
3479 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3480
3481 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3482 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3483 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3484
3485 spin_lock(&fs_info->balance_lock);
3486 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3487 spin_unlock(&fs_info->balance_lock);
3488}
3489
3490/*
3491 * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as
3492 * required.
3493 *
3494 * @fs_info: the filesystem
3495 * @excl_acquired: ptr to boolean value which is set to false in case balance
3496 * is being resumed
3497 *
3498 * Return 0 on success in which case both fs_info::balance is acquired as well
3499 * as exclusive ops are blocked. In case of failure return an error code.
3500 */
3501static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired)
3502{
3503 int ret;
3504
3505 /*
3506 * Exclusive operation is locked. Three possibilities:
3507 * (1) some other op is running
3508 * (2) balance is running
3509 * (3) balance is paused -- special case (think resume)
3510 */
3511 while (1) {
3512 if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
3513 *excl_acquired = true;
3514 mutex_lock(&fs_info->balance_mutex);
3515 return 0;
3516 }
3517
3518 mutex_lock(&fs_info->balance_mutex);
3519 if (fs_info->balance_ctl) {
3520 /* This is either (2) or (3) */
3521 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3522 /* This is (2) */
3523 ret = -EINPROGRESS;
3524 goto out_failure;
3525
3526 } else {
3527 mutex_unlock(&fs_info->balance_mutex);
3528 /*
3529 * Lock released to allow other waiters to
3530 * continue, we'll reexamine the status again.
3531 */
3532 mutex_lock(&fs_info->balance_mutex);
3533
3534 if (fs_info->balance_ctl &&
3535 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3536 /* This is (3) */
3537 *excl_acquired = false;
3538 return 0;
3539 }
3540 }
3541 } else {
3542 /* This is (1) */
3543 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3544 goto out_failure;
3545 }
3546
3547 mutex_unlock(&fs_info->balance_mutex);
3548 }
3549
3550out_failure:
3551 mutex_unlock(&fs_info->balance_mutex);
3552 *excl_acquired = false;
3553 return ret;
3554}
3555
3556static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3557{
3558 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3559 struct btrfs_fs_info *fs_info = root->fs_info;
3560 struct btrfs_ioctl_balance_args *bargs;
3561 struct btrfs_balance_control *bctl;
3562 bool need_unlock = true;
3563 int ret;
3564
3565 if (!capable(CAP_SYS_ADMIN))
3566 return -EPERM;
3567
3568 ret = mnt_want_write_file(file);
3569 if (ret)
3570 return ret;
3571
3572 bargs = memdup_user(arg, sizeof(*bargs));
3573 if (IS_ERR(bargs)) {
3574 ret = PTR_ERR(bargs);
3575 bargs = NULL;
3576 goto out;
3577 }
3578
3579 ret = btrfs_try_lock_balance(fs_info, &need_unlock);
3580 if (ret)
3581 goto out;
3582
3583 lockdep_assert_held(&fs_info->balance_mutex);
3584
3585 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3586 if (!fs_info->balance_ctl) {
3587 ret = -ENOTCONN;
3588 goto out_unlock;
3589 }
3590
3591 bctl = fs_info->balance_ctl;
3592 spin_lock(&fs_info->balance_lock);
3593 bctl->flags |= BTRFS_BALANCE_RESUME;
3594 spin_unlock(&fs_info->balance_lock);
3595 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE);
3596
3597 goto do_balance;
3598 }
3599
3600 if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
3601 ret = -EINVAL;
3602 goto out_unlock;
3603 }
3604
3605 if (fs_info->balance_ctl) {
3606 ret = -EINPROGRESS;
3607 goto out_unlock;
3608 }
3609
3610 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
3611 if (!bctl) {
3612 ret = -ENOMEM;
3613 goto out_unlock;
3614 }
3615
3616 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3617 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3618 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3619
3620 bctl->flags = bargs->flags;
3621do_balance:
3622 /*
3623 * Ownership of bctl and exclusive operation goes to btrfs_balance.
3624 * bctl is freed in reset_balance_state, or, if restriper was paused
3625 * all the way until unmount, in free_fs_info. The flag should be
3626 * cleared after reset_balance_state.
3627 */
3628 need_unlock = false;
3629
3630 ret = btrfs_balance(fs_info, bctl, bargs);
3631 bctl = NULL;
3632
3633 if (ret == 0 || ret == -ECANCELED) {
3634 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3635 ret = -EFAULT;
3636 }
3637
3638 kfree(bctl);
3639out_unlock:
3640 mutex_unlock(&fs_info->balance_mutex);
3641 if (need_unlock)
3642 btrfs_exclop_finish(fs_info);
3643out:
3644 mnt_drop_write_file(file);
3645 kfree(bargs);
3646 return ret;
3647}
3648
3649static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
3650{
3651 if (!capable(CAP_SYS_ADMIN))
3652 return -EPERM;
3653
3654 switch (cmd) {
3655 case BTRFS_BALANCE_CTL_PAUSE:
3656 return btrfs_pause_balance(fs_info);
3657 case BTRFS_BALANCE_CTL_CANCEL:
3658 return btrfs_cancel_balance(fs_info);
3659 }
3660
3661 return -EINVAL;
3662}
3663
3664static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
3665 void __user *arg)
3666{
3667 struct btrfs_ioctl_balance_args *bargs;
3668 int ret = 0;
3669
3670 if (!capable(CAP_SYS_ADMIN))
3671 return -EPERM;
3672
3673 mutex_lock(&fs_info->balance_mutex);
3674 if (!fs_info->balance_ctl) {
3675 ret = -ENOTCONN;
3676 goto out;
3677 }
3678
3679 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
3680 if (!bargs) {
3681 ret = -ENOMEM;
3682 goto out;
3683 }
3684
3685 btrfs_update_ioctl_balance_args(fs_info, bargs);
3686
3687 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3688 ret = -EFAULT;
3689
3690 kfree(bargs);
3691out:
3692 mutex_unlock(&fs_info->balance_mutex);
3693 return ret;
3694}
3695
3696static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
3697{
3698 struct inode *inode = file_inode(file);
3699 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3700 struct btrfs_ioctl_quota_ctl_args *sa;
3701 int ret;
3702
3703 if (!capable(CAP_SYS_ADMIN))
3704 return -EPERM;
3705
3706 ret = mnt_want_write_file(file);
3707 if (ret)
3708 return ret;
3709
3710 sa = memdup_user(arg, sizeof(*sa));
3711 if (IS_ERR(sa)) {
3712 ret = PTR_ERR(sa);
3713 goto drop_write;
3714 }
3715
3716 down_write(&fs_info->subvol_sem);
3717
3718 switch (sa->cmd) {
3719 case BTRFS_QUOTA_CTL_ENABLE:
3720 case BTRFS_QUOTA_CTL_ENABLE_SIMPLE_QUOTA:
3721 ret = btrfs_quota_enable(fs_info, sa);
3722 break;
3723 case BTRFS_QUOTA_CTL_DISABLE:
3724 ret = btrfs_quota_disable(fs_info);
3725 break;
3726 default:
3727 ret = -EINVAL;
3728 break;
3729 }
3730
3731 kfree(sa);
3732 up_write(&fs_info->subvol_sem);
3733drop_write:
3734 mnt_drop_write_file(file);
3735 return ret;
3736}
3737
3738static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
3739{
3740 struct inode *inode = file_inode(file);
3741 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3742 struct btrfs_root *root = BTRFS_I(inode)->root;
3743 struct btrfs_ioctl_qgroup_assign_args *sa;
3744 struct btrfs_trans_handle *trans;
3745 int ret;
3746 int err;
3747
3748 if (!capable(CAP_SYS_ADMIN))
3749 return -EPERM;
3750
3751 ret = mnt_want_write_file(file);
3752 if (ret)
3753 return ret;
3754
3755 sa = memdup_user(arg, sizeof(*sa));
3756 if (IS_ERR(sa)) {
3757 ret = PTR_ERR(sa);
3758 goto drop_write;
3759 }
3760
3761 trans = btrfs_join_transaction(root);
3762 if (IS_ERR(trans)) {
3763 ret = PTR_ERR(trans);
3764 goto out;
3765 }
3766
3767 if (sa->assign) {
3768 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
3769 } else {
3770 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
3771 }
3772
3773 /* update qgroup status and info */
3774 mutex_lock(&fs_info->qgroup_ioctl_lock);
3775 err = btrfs_run_qgroups(trans);
3776 mutex_unlock(&fs_info->qgroup_ioctl_lock);
3777 if (err < 0)
3778 btrfs_handle_fs_error(fs_info, err,
3779 "failed to update qgroup status and info");
3780 err = btrfs_end_transaction(trans);
3781 if (err && !ret)
3782 ret = err;
3783
3784out:
3785 kfree(sa);
3786drop_write:
3787 mnt_drop_write_file(file);
3788 return ret;
3789}
3790
3791static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
3792{
3793 struct inode *inode = file_inode(file);
3794 struct btrfs_root *root = BTRFS_I(inode)->root;
3795 struct btrfs_ioctl_qgroup_create_args *sa;
3796 struct btrfs_trans_handle *trans;
3797 int ret;
3798 int err;
3799
3800 if (!capable(CAP_SYS_ADMIN))
3801 return -EPERM;
3802
3803 ret = mnt_want_write_file(file);
3804 if (ret)
3805 return ret;
3806
3807 sa = memdup_user(arg, sizeof(*sa));
3808 if (IS_ERR(sa)) {
3809 ret = PTR_ERR(sa);
3810 goto drop_write;
3811 }
3812
3813 if (!sa->qgroupid) {
3814 ret = -EINVAL;
3815 goto out;
3816 }
3817
3818 if (sa->create && is_fstree(sa->qgroupid)) {
3819 ret = -EINVAL;
3820 goto out;
3821 }
3822
3823 trans = btrfs_join_transaction(root);
3824 if (IS_ERR(trans)) {
3825 ret = PTR_ERR(trans);
3826 goto out;
3827 }
3828
3829 if (sa->create) {
3830 ret = btrfs_create_qgroup(trans, sa->qgroupid);
3831 } else {
3832 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
3833 }
3834
3835 err = btrfs_end_transaction(trans);
3836 if (err && !ret)
3837 ret = err;
3838
3839out:
3840 kfree(sa);
3841drop_write:
3842 mnt_drop_write_file(file);
3843 return ret;
3844}
3845
3846static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
3847{
3848 struct inode *inode = file_inode(file);
3849 struct btrfs_root *root = BTRFS_I(inode)->root;
3850 struct btrfs_ioctl_qgroup_limit_args *sa;
3851 struct btrfs_trans_handle *trans;
3852 int ret;
3853 int err;
3854 u64 qgroupid;
3855
3856 if (!capable(CAP_SYS_ADMIN))
3857 return -EPERM;
3858
3859 ret = mnt_want_write_file(file);
3860 if (ret)
3861 return ret;
3862
3863 sa = memdup_user(arg, sizeof(*sa));
3864 if (IS_ERR(sa)) {
3865 ret = PTR_ERR(sa);
3866 goto drop_write;
3867 }
3868
3869 trans = btrfs_join_transaction(root);
3870 if (IS_ERR(trans)) {
3871 ret = PTR_ERR(trans);
3872 goto out;
3873 }
3874
3875 qgroupid = sa->qgroupid;
3876 if (!qgroupid) {
3877 /* take the current subvol as qgroup */
3878 qgroupid = root->root_key.objectid;
3879 }
3880
3881 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
3882
3883 err = btrfs_end_transaction(trans);
3884 if (err && !ret)
3885 ret = err;
3886
3887out:
3888 kfree(sa);
3889drop_write:
3890 mnt_drop_write_file(file);
3891 return ret;
3892}
3893
3894static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
3895{
3896 struct inode *inode = file_inode(file);
3897 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3898 struct btrfs_ioctl_quota_rescan_args *qsa;
3899 int ret;
3900
3901 if (!capable(CAP_SYS_ADMIN))
3902 return -EPERM;
3903
3904 ret = mnt_want_write_file(file);
3905 if (ret)
3906 return ret;
3907
3908 qsa = memdup_user(arg, sizeof(*qsa));
3909 if (IS_ERR(qsa)) {
3910 ret = PTR_ERR(qsa);
3911 goto drop_write;
3912 }
3913
3914 if (qsa->flags) {
3915 ret = -EINVAL;
3916 goto out;
3917 }
3918
3919 ret = btrfs_qgroup_rescan(fs_info);
3920
3921out:
3922 kfree(qsa);
3923drop_write:
3924 mnt_drop_write_file(file);
3925 return ret;
3926}
3927
3928static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
3929 void __user *arg)
3930{
3931 struct btrfs_ioctl_quota_rescan_args qsa = {0};
3932
3933 if (!capable(CAP_SYS_ADMIN))
3934 return -EPERM;
3935
3936 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
3937 qsa.flags = 1;
3938 qsa.progress = fs_info->qgroup_rescan_progress.objectid;
3939 }
3940
3941 if (copy_to_user(arg, &qsa, sizeof(qsa)))
3942 return -EFAULT;
3943
3944 return 0;
3945}
3946
3947static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
3948 void __user *arg)
3949{
3950 if (!capable(CAP_SYS_ADMIN))
3951 return -EPERM;
3952
3953 return btrfs_qgroup_wait_for_completion(fs_info, true);
3954}
3955
3956static long _btrfs_ioctl_set_received_subvol(struct file *file,
3957 struct mnt_idmap *idmap,
3958 struct btrfs_ioctl_received_subvol_args *sa)
3959{
3960 struct inode *inode = file_inode(file);
3961 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3962 struct btrfs_root *root = BTRFS_I(inode)->root;
3963 struct btrfs_root_item *root_item = &root->root_item;
3964 struct btrfs_trans_handle *trans;
3965 struct timespec64 ct = current_time(inode);
3966 int ret = 0;
3967 int received_uuid_changed;
3968
3969 if (!inode_owner_or_capable(idmap, inode))
3970 return -EPERM;
3971
3972 ret = mnt_want_write_file(file);
3973 if (ret < 0)
3974 return ret;
3975
3976 down_write(&fs_info->subvol_sem);
3977
3978 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
3979 ret = -EINVAL;
3980 goto out;
3981 }
3982
3983 if (btrfs_root_readonly(root)) {
3984 ret = -EROFS;
3985 goto out;
3986 }
3987
3988 /*
3989 * 1 - root item
3990 * 2 - uuid items (received uuid + subvol uuid)
3991 */
3992 trans = btrfs_start_transaction(root, 3);
3993 if (IS_ERR(trans)) {
3994 ret = PTR_ERR(trans);
3995 trans = NULL;
3996 goto out;
3997 }
3998
3999 sa->rtransid = trans->transid;
4000 sa->rtime.sec = ct.tv_sec;
4001 sa->rtime.nsec = ct.tv_nsec;
4002
4003 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4004 BTRFS_UUID_SIZE);
4005 if (received_uuid_changed &&
4006 !btrfs_is_empty_uuid(root_item->received_uuid)) {
4007 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
4008 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4009 root->root_key.objectid);
4010 if (ret && ret != -ENOENT) {
4011 btrfs_abort_transaction(trans, ret);
4012 btrfs_end_transaction(trans);
4013 goto out;
4014 }
4015 }
4016 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4017 btrfs_set_root_stransid(root_item, sa->stransid);
4018 btrfs_set_root_rtransid(root_item, sa->rtransid);
4019 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4020 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4021 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4022 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4023
4024 ret = btrfs_update_root(trans, fs_info->tree_root,
4025 &root->root_key, &root->root_item);
4026 if (ret < 0) {
4027 btrfs_end_transaction(trans);
4028 goto out;
4029 }
4030 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4031 ret = btrfs_uuid_tree_add(trans, sa->uuid,
4032 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4033 root->root_key.objectid);
4034 if (ret < 0 && ret != -EEXIST) {
4035 btrfs_abort_transaction(trans, ret);
4036 btrfs_end_transaction(trans);
4037 goto out;
4038 }
4039 }
4040 ret = btrfs_commit_transaction(trans);
4041out:
4042 up_write(&fs_info->subvol_sem);
4043 mnt_drop_write_file(file);
4044 return ret;
4045}
4046
4047#ifdef CONFIG_64BIT
4048static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4049 void __user *arg)
4050{
4051 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4052 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4053 int ret = 0;
4054
4055 args32 = memdup_user(arg, sizeof(*args32));
4056 if (IS_ERR(args32))
4057 return PTR_ERR(args32);
4058
4059 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
4060 if (!args64) {
4061 ret = -ENOMEM;
4062 goto out;
4063 }
4064
4065 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4066 args64->stransid = args32->stransid;
4067 args64->rtransid = args32->rtransid;
4068 args64->stime.sec = args32->stime.sec;
4069 args64->stime.nsec = args32->stime.nsec;
4070 args64->rtime.sec = args32->rtime.sec;
4071 args64->rtime.nsec = args32->rtime.nsec;
4072 args64->flags = args32->flags;
4073
4074 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), args64);
4075 if (ret)
4076 goto out;
4077
4078 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4079 args32->stransid = args64->stransid;
4080 args32->rtransid = args64->rtransid;
4081 args32->stime.sec = args64->stime.sec;
4082 args32->stime.nsec = args64->stime.nsec;
4083 args32->rtime.sec = args64->rtime.sec;
4084 args32->rtime.nsec = args64->rtime.nsec;
4085 args32->flags = args64->flags;
4086
4087 ret = copy_to_user(arg, args32, sizeof(*args32));
4088 if (ret)
4089 ret = -EFAULT;
4090
4091out:
4092 kfree(args32);
4093 kfree(args64);
4094 return ret;
4095}
4096#endif
4097
4098static long btrfs_ioctl_set_received_subvol(struct file *file,
4099 void __user *arg)
4100{
4101 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4102 int ret = 0;
4103
4104 sa = memdup_user(arg, sizeof(*sa));
4105 if (IS_ERR(sa))
4106 return PTR_ERR(sa);
4107
4108 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), sa);
4109
4110 if (ret)
4111 goto out;
4112
4113 ret = copy_to_user(arg, sa, sizeof(*sa));
4114 if (ret)
4115 ret = -EFAULT;
4116
4117out:
4118 kfree(sa);
4119 return ret;
4120}
4121
4122static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
4123 void __user *arg)
4124{
4125 size_t len;
4126 int ret;
4127 char label[BTRFS_LABEL_SIZE];
4128
4129 spin_lock(&fs_info->super_lock);
4130 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4131 spin_unlock(&fs_info->super_lock);
4132
4133 len = strnlen(label, BTRFS_LABEL_SIZE);
4134
4135 if (len == BTRFS_LABEL_SIZE) {
4136 btrfs_warn(fs_info,
4137 "label is too long, return the first %zu bytes",
4138 --len);
4139 }
4140
4141 ret = copy_to_user(arg, label, len);
4142
4143 return ret ? -EFAULT : 0;
4144}
4145
4146static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4147{
4148 struct inode *inode = file_inode(file);
4149 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4150 struct btrfs_root *root = BTRFS_I(inode)->root;
4151 struct btrfs_super_block *super_block = fs_info->super_copy;
4152 struct btrfs_trans_handle *trans;
4153 char label[BTRFS_LABEL_SIZE];
4154 int ret;
4155
4156 if (!capable(CAP_SYS_ADMIN))
4157 return -EPERM;
4158
4159 if (copy_from_user(label, arg, sizeof(label)))
4160 return -EFAULT;
4161
4162 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4163 btrfs_err(fs_info,
4164 "unable to set label with more than %d bytes",
4165 BTRFS_LABEL_SIZE - 1);
4166 return -EINVAL;
4167 }
4168
4169 ret = mnt_want_write_file(file);
4170 if (ret)
4171 return ret;
4172
4173 trans = btrfs_start_transaction(root, 0);
4174 if (IS_ERR(trans)) {
4175 ret = PTR_ERR(trans);
4176 goto out_unlock;
4177 }
4178
4179 spin_lock(&fs_info->super_lock);
4180 strcpy(super_block->label, label);
4181 spin_unlock(&fs_info->super_lock);
4182 ret = btrfs_commit_transaction(trans);
4183
4184out_unlock:
4185 mnt_drop_write_file(file);
4186 return ret;
4187}
4188
4189#define INIT_FEATURE_FLAGS(suffix) \
4190 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4191 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4192 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4193
4194int btrfs_ioctl_get_supported_features(void __user *arg)
4195{
4196 static const struct btrfs_ioctl_feature_flags features[3] = {
4197 INIT_FEATURE_FLAGS(SUPP),
4198 INIT_FEATURE_FLAGS(SAFE_SET),
4199 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4200 };
4201
4202 if (copy_to_user(arg, &features, sizeof(features)))
4203 return -EFAULT;
4204
4205 return 0;
4206}
4207
4208static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
4209 void __user *arg)
4210{
4211 struct btrfs_super_block *super_block = fs_info->super_copy;
4212 struct btrfs_ioctl_feature_flags features;
4213
4214 features.compat_flags = btrfs_super_compat_flags(super_block);
4215 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4216 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4217
4218 if (copy_to_user(arg, &features, sizeof(features)))
4219 return -EFAULT;
4220
4221 return 0;
4222}
4223
4224static int check_feature_bits(struct btrfs_fs_info *fs_info,
4225 enum btrfs_feature_set set,
4226 u64 change_mask, u64 flags, u64 supported_flags,
4227 u64 safe_set, u64 safe_clear)
4228{
4229 const char *type = btrfs_feature_set_name(set);
4230 char *names;
4231 u64 disallowed, unsupported;
4232 u64 set_mask = flags & change_mask;
4233 u64 clear_mask = ~flags & change_mask;
4234
4235 unsupported = set_mask & ~supported_flags;
4236 if (unsupported) {
4237 names = btrfs_printable_features(set, unsupported);
4238 if (names) {
4239 btrfs_warn(fs_info,
4240 "this kernel does not support the %s feature bit%s",
4241 names, strchr(names, ',') ? "s" : "");
4242 kfree(names);
4243 } else
4244 btrfs_warn(fs_info,
4245 "this kernel does not support %s bits 0x%llx",
4246 type, unsupported);
4247 return -EOPNOTSUPP;
4248 }
4249
4250 disallowed = set_mask & ~safe_set;
4251 if (disallowed) {
4252 names = btrfs_printable_features(set, disallowed);
4253 if (names) {
4254 btrfs_warn(fs_info,
4255 "can't set the %s feature bit%s while mounted",
4256 names, strchr(names, ',') ? "s" : "");
4257 kfree(names);
4258 } else
4259 btrfs_warn(fs_info,
4260 "can't set %s bits 0x%llx while mounted",
4261 type, disallowed);
4262 return -EPERM;
4263 }
4264
4265 disallowed = clear_mask & ~safe_clear;
4266 if (disallowed) {
4267 names = btrfs_printable_features(set, disallowed);
4268 if (names) {
4269 btrfs_warn(fs_info,
4270 "can't clear the %s feature bit%s while mounted",
4271 names, strchr(names, ',') ? "s" : "");
4272 kfree(names);
4273 } else
4274 btrfs_warn(fs_info,
4275 "can't clear %s bits 0x%llx while mounted",
4276 type, disallowed);
4277 return -EPERM;
4278 }
4279
4280 return 0;
4281}
4282
4283#define check_feature(fs_info, change_mask, flags, mask_base) \
4284check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
4285 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4286 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4287 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4288
4289static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4290{
4291 struct inode *inode = file_inode(file);
4292 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4293 struct btrfs_root *root = BTRFS_I(inode)->root;
4294 struct btrfs_super_block *super_block = fs_info->super_copy;
4295 struct btrfs_ioctl_feature_flags flags[2];
4296 struct btrfs_trans_handle *trans;
4297 u64 newflags;
4298 int ret;
4299
4300 if (!capable(CAP_SYS_ADMIN))
4301 return -EPERM;
4302
4303 if (copy_from_user(flags, arg, sizeof(flags)))
4304 return -EFAULT;
4305
4306 /* Nothing to do */
4307 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4308 !flags[0].incompat_flags)
4309 return 0;
4310
4311 ret = check_feature(fs_info, flags[0].compat_flags,
4312 flags[1].compat_flags, COMPAT);
4313 if (ret)
4314 return ret;
4315
4316 ret = check_feature(fs_info, flags[0].compat_ro_flags,
4317 flags[1].compat_ro_flags, COMPAT_RO);
4318 if (ret)
4319 return ret;
4320
4321 ret = check_feature(fs_info, flags[0].incompat_flags,
4322 flags[1].incompat_flags, INCOMPAT);
4323 if (ret)
4324 return ret;
4325
4326 ret = mnt_want_write_file(file);
4327 if (ret)
4328 return ret;
4329
4330 trans = btrfs_start_transaction(root, 0);
4331 if (IS_ERR(trans)) {
4332 ret = PTR_ERR(trans);
4333 goto out_drop_write;
4334 }
4335
4336 spin_lock(&fs_info->super_lock);
4337 newflags = btrfs_super_compat_flags(super_block);
4338 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4339 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4340 btrfs_set_super_compat_flags(super_block, newflags);
4341
4342 newflags = btrfs_super_compat_ro_flags(super_block);
4343 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4344 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4345 btrfs_set_super_compat_ro_flags(super_block, newflags);
4346
4347 newflags = btrfs_super_incompat_flags(super_block);
4348 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4349 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4350 btrfs_set_super_incompat_flags(super_block, newflags);
4351 spin_unlock(&fs_info->super_lock);
4352
4353 ret = btrfs_commit_transaction(trans);
4354out_drop_write:
4355 mnt_drop_write_file(file);
4356
4357 return ret;
4358}
4359
4360static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat)
4361{
4362 struct btrfs_ioctl_send_args *arg;
4363 int ret;
4364
4365 if (compat) {
4366#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4367 struct btrfs_ioctl_send_args_32 args32 = { 0 };
4368
4369 ret = copy_from_user(&args32, argp, sizeof(args32));
4370 if (ret)
4371 return -EFAULT;
4372 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
4373 if (!arg)
4374 return -ENOMEM;
4375 arg->send_fd = args32.send_fd;
4376 arg->clone_sources_count = args32.clone_sources_count;
4377 arg->clone_sources = compat_ptr(args32.clone_sources);
4378 arg->parent_root = args32.parent_root;
4379 arg->flags = args32.flags;
4380 arg->version = args32.version;
4381 memcpy(arg->reserved, args32.reserved,
4382 sizeof(args32.reserved));
4383#else
4384 return -ENOTTY;
4385#endif
4386 } else {
4387 arg = memdup_user(argp, sizeof(*arg));
4388 if (IS_ERR(arg))
4389 return PTR_ERR(arg);
4390 }
4391 ret = btrfs_ioctl_send(inode, arg);
4392 kfree(arg);
4393 return ret;
4394}
4395
4396static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp,
4397 bool compat)
4398{
4399 struct btrfs_ioctl_encoded_io_args args = { 0 };
4400 size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args,
4401 flags);
4402 size_t copy_end;
4403 struct iovec iovstack[UIO_FASTIOV];
4404 struct iovec *iov = iovstack;
4405 struct iov_iter iter;
4406 loff_t pos;
4407 struct kiocb kiocb;
4408 ssize_t ret;
4409
4410 if (!capable(CAP_SYS_ADMIN)) {
4411 ret = -EPERM;
4412 goto out_acct;
4413 }
4414
4415 if (compat) {
4416#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4417 struct btrfs_ioctl_encoded_io_args_32 args32;
4418
4419 copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32,
4420 flags);
4421 if (copy_from_user(&args32, argp, copy_end)) {
4422 ret = -EFAULT;
4423 goto out_acct;
4424 }
4425 args.iov = compat_ptr(args32.iov);
4426 args.iovcnt = args32.iovcnt;
4427 args.offset = args32.offset;
4428 args.flags = args32.flags;
4429#else
4430 return -ENOTTY;
4431#endif
4432 } else {
4433 copy_end = copy_end_kernel;
4434 if (copy_from_user(&args, argp, copy_end)) {
4435 ret = -EFAULT;
4436 goto out_acct;
4437 }
4438 }
4439 if (args.flags != 0) {
4440 ret = -EINVAL;
4441 goto out_acct;
4442 }
4443
4444 ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4445 &iov, &iter);
4446 if (ret < 0)
4447 goto out_acct;
4448
4449 if (iov_iter_count(&iter) == 0) {
4450 ret = 0;
4451 goto out_iov;
4452 }
4453 pos = args.offset;
4454 ret = rw_verify_area(READ, file, &pos, args.len);
4455 if (ret < 0)
4456 goto out_iov;
4457
4458 init_sync_kiocb(&kiocb, file);
4459 kiocb.ki_pos = pos;
4460
4461 ret = btrfs_encoded_read(&kiocb, &iter, &args);
4462 if (ret >= 0) {
4463 fsnotify_access(file);
4464 if (copy_to_user(argp + copy_end,
4465 (char *)&args + copy_end_kernel,
4466 sizeof(args) - copy_end_kernel))
4467 ret = -EFAULT;
4468 }
4469
4470out_iov:
4471 kfree(iov);
4472out_acct:
4473 if (ret > 0)
4474 add_rchar(current, ret);
4475 inc_syscr(current);
4476 return ret;
4477}
4478
4479static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat)
4480{
4481 struct btrfs_ioctl_encoded_io_args args;
4482 struct iovec iovstack[UIO_FASTIOV];
4483 struct iovec *iov = iovstack;
4484 struct iov_iter iter;
4485 loff_t pos;
4486 struct kiocb kiocb;
4487 ssize_t ret;
4488
4489 if (!capable(CAP_SYS_ADMIN)) {
4490 ret = -EPERM;
4491 goto out_acct;
4492 }
4493
4494 if (!(file->f_mode & FMODE_WRITE)) {
4495 ret = -EBADF;
4496 goto out_acct;
4497 }
4498
4499 if (compat) {
4500#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4501 struct btrfs_ioctl_encoded_io_args_32 args32;
4502
4503 if (copy_from_user(&args32, argp, sizeof(args32))) {
4504 ret = -EFAULT;
4505 goto out_acct;
4506 }
4507 args.iov = compat_ptr(args32.iov);
4508 args.iovcnt = args32.iovcnt;
4509 args.offset = args32.offset;
4510 args.flags = args32.flags;
4511 args.len = args32.len;
4512 args.unencoded_len = args32.unencoded_len;
4513 args.unencoded_offset = args32.unencoded_offset;
4514 args.compression = args32.compression;
4515 args.encryption = args32.encryption;
4516 memcpy(args.reserved, args32.reserved, sizeof(args.reserved));
4517#else
4518 return -ENOTTY;
4519#endif
4520 } else {
4521 if (copy_from_user(&args, argp, sizeof(args))) {
4522 ret = -EFAULT;
4523 goto out_acct;
4524 }
4525 }
4526
4527 ret = -EINVAL;
4528 if (args.flags != 0)
4529 goto out_acct;
4530 if (memchr_inv(args.reserved, 0, sizeof(args.reserved)))
4531 goto out_acct;
4532 if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE &&
4533 args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE)
4534 goto out_acct;
4535 if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES ||
4536 args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES)
4537 goto out_acct;
4538 if (args.unencoded_offset > args.unencoded_len)
4539 goto out_acct;
4540 if (args.len > args.unencoded_len - args.unencoded_offset)
4541 goto out_acct;
4542
4543 ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4544 &iov, &iter);
4545 if (ret < 0)
4546 goto out_acct;
4547
4548 if (iov_iter_count(&iter) == 0) {
4549 ret = 0;
4550 goto out_iov;
4551 }
4552 pos = args.offset;
4553 ret = rw_verify_area(WRITE, file, &pos, args.len);
4554 if (ret < 0)
4555 goto out_iov;
4556
4557 init_sync_kiocb(&kiocb, file);
4558 ret = kiocb_set_rw_flags(&kiocb, 0);
4559 if (ret)
4560 goto out_iov;
4561 kiocb.ki_pos = pos;
4562
4563 file_start_write(file);
4564
4565 ret = btrfs_do_write_iter(&kiocb, &iter, &args);
4566 if (ret > 0)
4567 fsnotify_modify(file);
4568
4569 file_end_write(file);
4570out_iov:
4571 kfree(iov);
4572out_acct:
4573 if (ret > 0)
4574 add_wchar(current, ret);
4575 inc_syscw(current);
4576 return ret;
4577}
4578
4579long btrfs_ioctl(struct file *file, unsigned int
4580 cmd, unsigned long arg)
4581{
4582 struct inode *inode = file_inode(file);
4583 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4584 struct btrfs_root *root = BTRFS_I(inode)->root;
4585 void __user *argp = (void __user *)arg;
4586
4587 switch (cmd) {
4588 case FS_IOC_GETVERSION:
4589 return btrfs_ioctl_getversion(inode, argp);
4590 case FS_IOC_GETFSLABEL:
4591 return btrfs_ioctl_get_fslabel(fs_info, argp);
4592 case FS_IOC_SETFSLABEL:
4593 return btrfs_ioctl_set_fslabel(file, argp);
4594 case FITRIM:
4595 return btrfs_ioctl_fitrim(fs_info, argp);
4596 case BTRFS_IOC_SNAP_CREATE:
4597 return btrfs_ioctl_snap_create(file, argp, 0);
4598 case BTRFS_IOC_SNAP_CREATE_V2:
4599 return btrfs_ioctl_snap_create_v2(file, argp, 0);
4600 case BTRFS_IOC_SUBVOL_CREATE:
4601 return btrfs_ioctl_snap_create(file, argp, 1);
4602 case BTRFS_IOC_SUBVOL_CREATE_V2:
4603 return btrfs_ioctl_snap_create_v2(file, argp, 1);
4604 case BTRFS_IOC_SNAP_DESTROY:
4605 return btrfs_ioctl_snap_destroy(file, argp, false);
4606 case BTRFS_IOC_SNAP_DESTROY_V2:
4607 return btrfs_ioctl_snap_destroy(file, argp, true);
4608 case BTRFS_IOC_SUBVOL_GETFLAGS:
4609 return btrfs_ioctl_subvol_getflags(inode, argp);
4610 case BTRFS_IOC_SUBVOL_SETFLAGS:
4611 return btrfs_ioctl_subvol_setflags(file, argp);
4612 case BTRFS_IOC_DEFAULT_SUBVOL:
4613 return btrfs_ioctl_default_subvol(file, argp);
4614 case BTRFS_IOC_DEFRAG:
4615 return btrfs_ioctl_defrag(file, NULL);
4616 case BTRFS_IOC_DEFRAG_RANGE:
4617 return btrfs_ioctl_defrag(file, argp);
4618 case BTRFS_IOC_RESIZE:
4619 return btrfs_ioctl_resize(file, argp);
4620 case BTRFS_IOC_ADD_DEV:
4621 return btrfs_ioctl_add_dev(fs_info, argp);
4622 case BTRFS_IOC_RM_DEV:
4623 return btrfs_ioctl_rm_dev(file, argp);
4624 case BTRFS_IOC_RM_DEV_V2:
4625 return btrfs_ioctl_rm_dev_v2(file, argp);
4626 case BTRFS_IOC_FS_INFO:
4627 return btrfs_ioctl_fs_info(fs_info, argp);
4628 case BTRFS_IOC_DEV_INFO:
4629 return btrfs_ioctl_dev_info(fs_info, argp);
4630 case BTRFS_IOC_TREE_SEARCH:
4631 return btrfs_ioctl_tree_search(inode, argp);
4632 case BTRFS_IOC_TREE_SEARCH_V2:
4633 return btrfs_ioctl_tree_search_v2(inode, argp);
4634 case BTRFS_IOC_INO_LOOKUP:
4635 return btrfs_ioctl_ino_lookup(root, argp);
4636 case BTRFS_IOC_INO_PATHS:
4637 return btrfs_ioctl_ino_to_path(root, argp);
4638 case BTRFS_IOC_LOGICAL_INO:
4639 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
4640 case BTRFS_IOC_LOGICAL_INO_V2:
4641 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
4642 case BTRFS_IOC_SPACE_INFO:
4643 return btrfs_ioctl_space_info(fs_info, argp);
4644 case BTRFS_IOC_SYNC: {
4645 int ret;
4646
4647 ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
4648 if (ret)
4649 return ret;
4650 ret = btrfs_sync_fs(inode->i_sb, 1);
4651 /*
4652 * The transaction thread may want to do more work,
4653 * namely it pokes the cleaner kthread that will start
4654 * processing uncleaned subvols.
4655 */
4656 wake_up_process(fs_info->transaction_kthread);
4657 return ret;
4658 }
4659 case BTRFS_IOC_START_SYNC:
4660 return btrfs_ioctl_start_sync(root, argp);
4661 case BTRFS_IOC_WAIT_SYNC:
4662 return btrfs_ioctl_wait_sync(fs_info, argp);
4663 case BTRFS_IOC_SCRUB:
4664 return btrfs_ioctl_scrub(file, argp);
4665 case BTRFS_IOC_SCRUB_CANCEL:
4666 return btrfs_ioctl_scrub_cancel(fs_info);
4667 case BTRFS_IOC_SCRUB_PROGRESS:
4668 return btrfs_ioctl_scrub_progress(fs_info, argp);
4669 case BTRFS_IOC_BALANCE_V2:
4670 return btrfs_ioctl_balance(file, argp);
4671 case BTRFS_IOC_BALANCE_CTL:
4672 return btrfs_ioctl_balance_ctl(fs_info, arg);
4673 case BTRFS_IOC_BALANCE_PROGRESS:
4674 return btrfs_ioctl_balance_progress(fs_info, argp);
4675 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4676 return btrfs_ioctl_set_received_subvol(file, argp);
4677#ifdef CONFIG_64BIT
4678 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
4679 return btrfs_ioctl_set_received_subvol_32(file, argp);
4680#endif
4681 case BTRFS_IOC_SEND:
4682 return _btrfs_ioctl_send(inode, argp, false);
4683#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4684 case BTRFS_IOC_SEND_32:
4685 return _btrfs_ioctl_send(inode, argp, true);
4686#endif
4687 case BTRFS_IOC_GET_DEV_STATS:
4688 return btrfs_ioctl_get_dev_stats(fs_info, argp);
4689 case BTRFS_IOC_QUOTA_CTL:
4690 return btrfs_ioctl_quota_ctl(file, argp);
4691 case BTRFS_IOC_QGROUP_ASSIGN:
4692 return btrfs_ioctl_qgroup_assign(file, argp);
4693 case BTRFS_IOC_QGROUP_CREATE:
4694 return btrfs_ioctl_qgroup_create(file, argp);
4695 case BTRFS_IOC_QGROUP_LIMIT:
4696 return btrfs_ioctl_qgroup_limit(file, argp);
4697 case BTRFS_IOC_QUOTA_RESCAN:
4698 return btrfs_ioctl_quota_rescan(file, argp);
4699 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4700 return btrfs_ioctl_quota_rescan_status(fs_info, argp);
4701 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4702 return btrfs_ioctl_quota_rescan_wait(fs_info, argp);
4703 case BTRFS_IOC_DEV_REPLACE:
4704 return btrfs_ioctl_dev_replace(fs_info, argp);
4705 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4706 return btrfs_ioctl_get_supported_features(argp);
4707 case BTRFS_IOC_GET_FEATURES:
4708 return btrfs_ioctl_get_features(fs_info, argp);
4709 case BTRFS_IOC_SET_FEATURES:
4710 return btrfs_ioctl_set_features(file, argp);
4711 case BTRFS_IOC_GET_SUBVOL_INFO:
4712 return btrfs_ioctl_get_subvol_info(inode, argp);
4713 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
4714 return btrfs_ioctl_get_subvol_rootref(root, argp);
4715 case BTRFS_IOC_INO_LOOKUP_USER:
4716 return btrfs_ioctl_ino_lookup_user(file, argp);
4717 case FS_IOC_ENABLE_VERITY:
4718 return fsverity_ioctl_enable(file, (const void __user *)argp);
4719 case FS_IOC_MEASURE_VERITY:
4720 return fsverity_ioctl_measure(file, argp);
4721 case BTRFS_IOC_ENCODED_READ:
4722 return btrfs_ioctl_encoded_read(file, argp, false);
4723 case BTRFS_IOC_ENCODED_WRITE:
4724 return btrfs_ioctl_encoded_write(file, argp, false);
4725#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4726 case BTRFS_IOC_ENCODED_READ_32:
4727 return btrfs_ioctl_encoded_read(file, argp, true);
4728 case BTRFS_IOC_ENCODED_WRITE_32:
4729 return btrfs_ioctl_encoded_write(file, argp, true);
4730#endif
4731 }
4732
4733 return -ENOTTY;
4734}
4735
4736#ifdef CONFIG_COMPAT
4737long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
4738{
4739 /*
4740 * These all access 32-bit values anyway so no further
4741 * handling is necessary.
4742 */
4743 switch (cmd) {
4744 case FS_IOC32_GETVERSION:
4745 cmd = FS_IOC_GETVERSION;
4746 break;
4747 }
4748
4749 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
4750}
4751#endif