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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 <linux/io_uring/cmd.h>
33#include "ctree.h"
34#include "disk-io.h"
35#include "export.h"
36#include "transaction.h"
37#include "btrfs_inode.h"
38#include "volumes.h"
39#include "locking.h"
40#include "backref.h"
41#include "send.h"
42#include "dev-replace.h"
43#include "props.h"
44#include "sysfs.h"
45#include "qgroup.h"
46#include "tree-log.h"
47#include "compression.h"
48#include "space-info.h"
49#include "block-group.h"
50#include "fs.h"
51#include "accessors.h"
52#include "extent-tree.h"
53#include "root-tree.h"
54#include "defrag.h"
55#include "dir-item.h"
56#include "uuid-tree.h"
57#include "ioctl.h"
58#include "file.h"
59#include "scrub.h"
60#include "super.h"
61
62#ifdef CONFIG_64BIT
63/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
64 * structures are incorrect, as the timespec structure from userspace
65 * is 4 bytes too small. We define these alternatives here to teach
66 * the kernel about the 32-bit struct packing.
67 */
68struct btrfs_ioctl_timespec_32 {
69 __u64 sec;
70 __u32 nsec;
71} __attribute__ ((__packed__));
72
73struct btrfs_ioctl_received_subvol_args_32 {
74 char uuid[BTRFS_UUID_SIZE]; /* in */
75 __u64 stransid; /* in */
76 __u64 rtransid; /* out */
77 struct btrfs_ioctl_timespec_32 stime; /* in */
78 struct btrfs_ioctl_timespec_32 rtime; /* out */
79 __u64 flags; /* in */
80 __u64 reserved[16]; /* in */
81} __attribute__ ((__packed__));
82
83#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
84 struct btrfs_ioctl_received_subvol_args_32)
85#endif
86
87#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
88struct btrfs_ioctl_send_args_32 {
89 __s64 send_fd; /* in */
90 __u64 clone_sources_count; /* in */
91 compat_uptr_t clone_sources; /* in */
92 __u64 parent_root; /* in */
93 __u64 flags; /* in */
94 __u32 version; /* in */
95 __u8 reserved[28]; /* in */
96} __attribute__ ((__packed__));
97
98#define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
99 struct btrfs_ioctl_send_args_32)
100
101struct btrfs_ioctl_encoded_io_args_32 {
102 compat_uptr_t iov;
103 compat_ulong_t iovcnt;
104 __s64 offset;
105 __u64 flags;
106 __u64 len;
107 __u64 unencoded_len;
108 __u64 unencoded_offset;
109 __u32 compression;
110 __u32 encryption;
111 __u8 reserved[64];
112};
113
114#define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \
115 struct btrfs_ioctl_encoded_io_args_32)
116#define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \
117 struct btrfs_ioctl_encoded_io_args_32)
118#endif
119
120/* Mask out flags that are inappropriate for the given type of inode. */
121static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
122 unsigned int flags)
123{
124 if (S_ISDIR(inode->i_mode))
125 return flags;
126 else if (S_ISREG(inode->i_mode))
127 return flags & ~FS_DIRSYNC_FL;
128 else
129 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
130}
131
132/*
133 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
134 * ioctl.
135 */
136static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode)
137{
138 unsigned int iflags = 0;
139 u32 flags = binode->flags;
140 u32 ro_flags = binode->ro_flags;
141
142 if (flags & BTRFS_INODE_SYNC)
143 iflags |= FS_SYNC_FL;
144 if (flags & BTRFS_INODE_IMMUTABLE)
145 iflags |= FS_IMMUTABLE_FL;
146 if (flags & BTRFS_INODE_APPEND)
147 iflags |= FS_APPEND_FL;
148 if (flags & BTRFS_INODE_NODUMP)
149 iflags |= FS_NODUMP_FL;
150 if (flags & BTRFS_INODE_NOATIME)
151 iflags |= FS_NOATIME_FL;
152 if (flags & BTRFS_INODE_DIRSYNC)
153 iflags |= FS_DIRSYNC_FL;
154 if (flags & BTRFS_INODE_NODATACOW)
155 iflags |= FS_NOCOW_FL;
156 if (ro_flags & BTRFS_INODE_RO_VERITY)
157 iflags |= FS_VERITY_FL;
158
159 if (flags & BTRFS_INODE_NOCOMPRESS)
160 iflags |= FS_NOCOMP_FL;
161 else if (flags & BTRFS_INODE_COMPRESS)
162 iflags |= FS_COMPR_FL;
163
164 return iflags;
165}
166
167/*
168 * Update inode->i_flags based on the btrfs internal flags.
169 */
170void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
171{
172 struct btrfs_inode *binode = BTRFS_I(inode);
173 unsigned int new_fl = 0;
174
175 if (binode->flags & BTRFS_INODE_SYNC)
176 new_fl |= S_SYNC;
177 if (binode->flags & BTRFS_INODE_IMMUTABLE)
178 new_fl |= S_IMMUTABLE;
179 if (binode->flags & BTRFS_INODE_APPEND)
180 new_fl |= S_APPEND;
181 if (binode->flags & BTRFS_INODE_NOATIME)
182 new_fl |= S_NOATIME;
183 if (binode->flags & BTRFS_INODE_DIRSYNC)
184 new_fl |= S_DIRSYNC;
185 if (binode->ro_flags & BTRFS_INODE_RO_VERITY)
186 new_fl |= S_VERITY;
187
188 set_mask_bits(&inode->i_flags,
189 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC |
190 S_VERITY, new_fl);
191}
192
193/*
194 * Check if @flags are a supported and valid set of FS_*_FL flags and that
195 * the old and new flags are not conflicting
196 */
197static int check_fsflags(unsigned int old_flags, unsigned int flags)
198{
199 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
200 FS_NOATIME_FL | FS_NODUMP_FL | \
201 FS_SYNC_FL | FS_DIRSYNC_FL | \
202 FS_NOCOMP_FL | FS_COMPR_FL |
203 FS_NOCOW_FL))
204 return -EOPNOTSUPP;
205
206 /* COMPR and NOCOMP on new/old are valid */
207 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
208 return -EINVAL;
209
210 if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
211 return -EINVAL;
212
213 /* NOCOW and compression options are mutually exclusive */
214 if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
215 return -EINVAL;
216 if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
217 return -EINVAL;
218
219 return 0;
220}
221
222static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
223 unsigned int flags)
224{
225 if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL))
226 return -EPERM;
227
228 return 0;
229}
230
231int btrfs_check_ioctl_vol_args_path(const struct btrfs_ioctl_vol_args *vol_args)
232{
233 if (memchr(vol_args->name, 0, sizeof(vol_args->name)) == NULL)
234 return -ENAMETOOLONG;
235 return 0;
236}
237
238static int btrfs_check_ioctl_vol_args2_subvol_name(const struct btrfs_ioctl_vol_args_v2 *vol_args2)
239{
240 if (memchr(vol_args2->name, 0, sizeof(vol_args2->name)) == NULL)
241 return -ENAMETOOLONG;
242 return 0;
243}
244
245/*
246 * Set flags/xflags from the internal inode flags. The remaining items of
247 * fsxattr are zeroed.
248 */
249int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
250{
251 struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
252
253 fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode));
254 return 0;
255}
256
257int btrfs_fileattr_set(struct mnt_idmap *idmap,
258 struct dentry *dentry, struct fileattr *fa)
259{
260 struct inode *inode = d_inode(dentry);
261 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
262 struct btrfs_inode *binode = BTRFS_I(inode);
263 struct btrfs_root *root = binode->root;
264 struct btrfs_trans_handle *trans;
265 unsigned int fsflags, old_fsflags;
266 int ret;
267 const char *comp = NULL;
268 u32 binode_flags;
269
270 if (btrfs_root_readonly(root))
271 return -EROFS;
272
273 if (fileattr_has_fsx(fa))
274 return -EOPNOTSUPP;
275
276 fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
277 old_fsflags = btrfs_inode_flags_to_fsflags(binode);
278 ret = check_fsflags(old_fsflags, fsflags);
279 if (ret)
280 return ret;
281
282 ret = check_fsflags_compatible(fs_info, fsflags);
283 if (ret)
284 return ret;
285
286 binode_flags = binode->flags;
287 if (fsflags & FS_SYNC_FL)
288 binode_flags |= BTRFS_INODE_SYNC;
289 else
290 binode_flags &= ~BTRFS_INODE_SYNC;
291 if (fsflags & FS_IMMUTABLE_FL)
292 binode_flags |= BTRFS_INODE_IMMUTABLE;
293 else
294 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
295 if (fsflags & FS_APPEND_FL)
296 binode_flags |= BTRFS_INODE_APPEND;
297 else
298 binode_flags &= ~BTRFS_INODE_APPEND;
299 if (fsflags & FS_NODUMP_FL)
300 binode_flags |= BTRFS_INODE_NODUMP;
301 else
302 binode_flags &= ~BTRFS_INODE_NODUMP;
303 if (fsflags & FS_NOATIME_FL)
304 binode_flags |= BTRFS_INODE_NOATIME;
305 else
306 binode_flags &= ~BTRFS_INODE_NOATIME;
307
308 /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
309 if (!fa->flags_valid) {
310 /* 1 item for the inode */
311 trans = btrfs_start_transaction(root, 1);
312 if (IS_ERR(trans))
313 return PTR_ERR(trans);
314 goto update_flags;
315 }
316
317 if (fsflags & FS_DIRSYNC_FL)
318 binode_flags |= BTRFS_INODE_DIRSYNC;
319 else
320 binode_flags &= ~BTRFS_INODE_DIRSYNC;
321 if (fsflags & FS_NOCOW_FL) {
322 if (S_ISREG(inode->i_mode)) {
323 /*
324 * It's safe to turn csums off here, no extents exist.
325 * Otherwise we want the flag to reflect the real COW
326 * status of the file and will not set it.
327 */
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 } else {
335 /*
336 * Revert back under same assumptions as above
337 */
338 if (S_ISREG(inode->i_mode)) {
339 if (inode->i_size == 0)
340 binode_flags &= ~(BTRFS_INODE_NODATACOW |
341 BTRFS_INODE_NODATASUM);
342 } else {
343 binode_flags &= ~BTRFS_INODE_NODATACOW;
344 }
345 }
346
347 /*
348 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
349 * flag may be changed automatically if compression code won't make
350 * things smaller.
351 */
352 if (fsflags & FS_NOCOMP_FL) {
353 binode_flags &= ~BTRFS_INODE_COMPRESS;
354 binode_flags |= BTRFS_INODE_NOCOMPRESS;
355 } else if (fsflags & FS_COMPR_FL) {
356
357 if (IS_SWAPFILE(inode))
358 return -ETXTBSY;
359
360 binode_flags |= BTRFS_INODE_COMPRESS;
361 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
362
363 comp = btrfs_compress_type2str(fs_info->compress_type);
364 if (!comp || comp[0] == 0)
365 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
366 } else {
367 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
368 }
369
370 /*
371 * 1 for inode item
372 * 2 for properties
373 */
374 trans = btrfs_start_transaction(root, 3);
375 if (IS_ERR(trans))
376 return PTR_ERR(trans);
377
378 if (comp) {
379 ret = btrfs_set_prop(trans, BTRFS_I(inode), "btrfs.compression",
380 comp, strlen(comp), 0);
381 if (ret) {
382 btrfs_abort_transaction(trans, ret);
383 goto out_end_trans;
384 }
385 } else {
386 ret = btrfs_set_prop(trans, BTRFS_I(inode), "btrfs.compression",
387 NULL, 0, 0);
388 if (ret && ret != -ENODATA) {
389 btrfs_abort_transaction(trans, ret);
390 goto out_end_trans;
391 }
392 }
393
394update_flags:
395 binode->flags = binode_flags;
396 btrfs_sync_inode_flags_to_i_flags(inode);
397 inode_inc_iversion(inode);
398 inode_set_ctime_current(inode);
399 ret = btrfs_update_inode(trans, BTRFS_I(inode));
400
401 out_end_trans:
402 btrfs_end_transaction(trans);
403 return ret;
404}
405
406/*
407 * Start exclusive operation @type, return true on success
408 */
409bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
410 enum btrfs_exclusive_operation type)
411{
412 bool ret = false;
413
414 spin_lock(&fs_info->super_lock);
415 if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) {
416 fs_info->exclusive_operation = type;
417 ret = true;
418 }
419 spin_unlock(&fs_info->super_lock);
420
421 return ret;
422}
423
424/*
425 * Conditionally allow to enter the exclusive operation in case it's compatible
426 * with the running one. This must be paired with btrfs_exclop_start_unlock and
427 * btrfs_exclop_finish.
428 *
429 * Compatibility:
430 * - the same type is already running
431 * - when trying to add a device and balance has been paused
432 * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller
433 * must check the condition first that would allow none -> @type
434 */
435bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
436 enum btrfs_exclusive_operation type)
437{
438 spin_lock(&fs_info->super_lock);
439 if (fs_info->exclusive_operation == type ||
440 (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED &&
441 type == BTRFS_EXCLOP_DEV_ADD))
442 return true;
443
444 spin_unlock(&fs_info->super_lock);
445 return false;
446}
447
448void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info)
449{
450 spin_unlock(&fs_info->super_lock);
451}
452
453void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
454{
455 spin_lock(&fs_info->super_lock);
456 WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
457 spin_unlock(&fs_info->super_lock);
458 sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
459}
460
461void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
462 enum btrfs_exclusive_operation op)
463{
464 switch (op) {
465 case BTRFS_EXCLOP_BALANCE_PAUSED:
466 spin_lock(&fs_info->super_lock);
467 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE ||
468 fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD ||
469 fs_info->exclusive_operation == BTRFS_EXCLOP_NONE ||
470 fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
471 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED;
472 spin_unlock(&fs_info->super_lock);
473 break;
474 case BTRFS_EXCLOP_BALANCE:
475 spin_lock(&fs_info->super_lock);
476 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
477 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE;
478 spin_unlock(&fs_info->super_lock);
479 break;
480 default:
481 btrfs_warn(fs_info,
482 "invalid exclop balance operation %d requested", op);
483 }
484}
485
486static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg)
487{
488 return put_user(inode->i_generation, arg);
489}
490
491static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
492 void __user *arg)
493{
494 struct btrfs_device *device;
495 struct fstrim_range range;
496 u64 minlen = ULLONG_MAX;
497 u64 num_devices = 0;
498 int ret;
499
500 if (!capable(CAP_SYS_ADMIN))
501 return -EPERM;
502
503 /*
504 * btrfs_trim_block_group() depends on space cache, which is not
505 * available in zoned filesystem. So, disallow fitrim on a zoned
506 * filesystem for now.
507 */
508 if (btrfs_is_zoned(fs_info))
509 return -EOPNOTSUPP;
510
511 /*
512 * If the fs is mounted with nologreplay, which requires it to be
513 * mounted in RO mode as well, we can not allow discard on free space
514 * inside block groups, because log trees refer to extents that are not
515 * pinned in a block group's free space cache (pinning the extents is
516 * precisely the first phase of replaying a log tree).
517 */
518 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
519 return -EROFS;
520
521 rcu_read_lock();
522 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
523 dev_list) {
524 if (!device->bdev || !bdev_max_discard_sectors(device->bdev))
525 continue;
526 num_devices++;
527 minlen = min_t(u64, bdev_discard_granularity(device->bdev),
528 minlen);
529 }
530 rcu_read_unlock();
531
532 if (!num_devices)
533 return -EOPNOTSUPP;
534 if (copy_from_user(&range, arg, sizeof(range)))
535 return -EFAULT;
536
537 /*
538 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
539 * block group is in the logical address space, which can be any
540 * sectorsize aligned bytenr in the range [0, U64_MAX].
541 */
542 if (range.len < fs_info->sectorsize)
543 return -EINVAL;
544
545 range.minlen = max(range.minlen, minlen);
546 ret = btrfs_trim_fs(fs_info, &range);
547
548 if (copy_to_user(arg, &range, sizeof(range)))
549 return -EFAULT;
550
551 return ret;
552}
553
554int __pure btrfs_is_empty_uuid(const u8 *uuid)
555{
556 int i;
557
558 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
559 if (uuid[i])
560 return 0;
561 }
562 return 1;
563}
564
565/*
566 * Calculate the number of transaction items to reserve for creating a subvolume
567 * or snapshot, not including the inode, directory entries, or parent directory.
568 */
569static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit)
570{
571 /*
572 * 1 to add root block
573 * 1 to add root item
574 * 1 to add root ref
575 * 1 to add root backref
576 * 1 to add UUID item
577 * 1 to add qgroup info
578 * 1 to add qgroup limit
579 *
580 * Ideally the last two would only be accounted if qgroups are enabled,
581 * but that can change between now and the time we would insert them.
582 */
583 unsigned int num_items = 7;
584
585 if (inherit) {
586 /* 2 to add qgroup relations for each inherited qgroup */
587 num_items += 2 * inherit->num_qgroups;
588 }
589 return num_items;
590}
591
592static noinline int create_subvol(struct mnt_idmap *idmap,
593 struct inode *dir, struct dentry *dentry,
594 struct btrfs_qgroup_inherit *inherit)
595{
596 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
597 struct btrfs_trans_handle *trans;
598 struct btrfs_key key;
599 struct btrfs_root_item *root_item;
600 struct btrfs_inode_item *inode_item;
601 struct extent_buffer *leaf;
602 struct btrfs_root *root = BTRFS_I(dir)->root;
603 struct btrfs_root *new_root;
604 struct btrfs_block_rsv block_rsv;
605 struct timespec64 cur_time = current_time(dir);
606 struct btrfs_new_inode_args new_inode_args = {
607 .dir = dir,
608 .dentry = dentry,
609 .subvol = true,
610 };
611 unsigned int trans_num_items;
612 int ret;
613 dev_t anon_dev;
614 u64 objectid;
615 u64 qgroup_reserved = 0;
616
617 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
618 if (!root_item)
619 return -ENOMEM;
620
621 ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid);
622 if (ret)
623 goto out_root_item;
624
625 /*
626 * Don't create subvolume whose level is not zero. Or qgroup will be
627 * screwed up since it assumes subvolume qgroup's level to be 0.
628 */
629 if (btrfs_qgroup_level(objectid)) {
630 ret = -ENOSPC;
631 goto out_root_item;
632 }
633
634 ret = get_anon_bdev(&anon_dev);
635 if (ret < 0)
636 goto out_root_item;
637
638 new_inode_args.inode = btrfs_new_subvol_inode(idmap, dir);
639 if (!new_inode_args.inode) {
640 ret = -ENOMEM;
641 goto out_anon_dev;
642 }
643 ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items);
644 if (ret)
645 goto out_inode;
646 trans_num_items += create_subvol_num_items(inherit);
647
648 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
649 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
650 trans_num_items, false);
651 if (ret)
652 goto out_new_inode_args;
653 qgroup_reserved = block_rsv.qgroup_rsv_reserved;
654
655 trans = btrfs_start_transaction(root, 0);
656 if (IS_ERR(trans)) {
657 ret = PTR_ERR(trans);
658 goto out_release_rsv;
659 }
660 btrfs_qgroup_convert_reserved_meta(root, qgroup_reserved);
661 qgroup_reserved = 0;
662 trans->block_rsv = &block_rsv;
663 trans->bytes_reserved = block_rsv.size;
664
665 ret = btrfs_qgroup_inherit(trans, 0, objectid, btrfs_root_id(root), inherit);
666 if (ret)
667 goto out;
668
669 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
670 0, BTRFS_NESTING_NORMAL);
671 if (IS_ERR(leaf)) {
672 ret = PTR_ERR(leaf);
673 goto out;
674 }
675
676 btrfs_mark_buffer_dirty(trans, leaf);
677
678 inode_item = &root_item->inode;
679 btrfs_set_stack_inode_generation(inode_item, 1);
680 btrfs_set_stack_inode_size(inode_item, 3);
681 btrfs_set_stack_inode_nlink(inode_item, 1);
682 btrfs_set_stack_inode_nbytes(inode_item,
683 fs_info->nodesize);
684 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
685
686 btrfs_set_root_flags(root_item, 0);
687 btrfs_set_root_limit(root_item, 0);
688 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
689
690 btrfs_set_root_bytenr(root_item, leaf->start);
691 btrfs_set_root_generation(root_item, trans->transid);
692 btrfs_set_root_level(root_item, 0);
693 btrfs_set_root_refs(root_item, 1);
694 btrfs_set_root_used(root_item, leaf->len);
695 btrfs_set_root_last_snapshot(root_item, 0);
696
697 btrfs_set_root_generation_v2(root_item,
698 btrfs_root_generation(root_item));
699 generate_random_guid(root_item->uuid);
700 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
701 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
702 root_item->ctime = root_item->otime;
703 btrfs_set_root_ctransid(root_item, trans->transid);
704 btrfs_set_root_otransid(root_item, trans->transid);
705
706 btrfs_tree_unlock(leaf);
707
708 btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID);
709
710 key.objectid = objectid;
711 key.offset = 0;
712 key.type = BTRFS_ROOT_ITEM_KEY;
713 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
714 root_item);
715 if (ret) {
716 int ret2;
717
718 /*
719 * Since we don't abort the transaction in this case, free the
720 * tree block so that we don't leak space and leave the
721 * filesystem in an inconsistent state (an extent item in the
722 * extent tree with a backreference for a root that does not
723 * exists).
724 */
725 btrfs_tree_lock(leaf);
726 btrfs_clear_buffer_dirty(trans, leaf);
727 btrfs_tree_unlock(leaf);
728 ret2 = btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
729 if (ret2 < 0)
730 btrfs_abort_transaction(trans, ret2);
731 free_extent_buffer(leaf);
732 goto out;
733 }
734
735 free_extent_buffer(leaf);
736 leaf = NULL;
737
738 new_root = btrfs_get_new_fs_root(fs_info, objectid, &anon_dev);
739 if (IS_ERR(new_root)) {
740 ret = PTR_ERR(new_root);
741 btrfs_abort_transaction(trans, ret);
742 goto out;
743 }
744 /* anon_dev is owned by new_root now. */
745 anon_dev = 0;
746 BTRFS_I(new_inode_args.inode)->root = new_root;
747 /* ... and new_root is owned by new_inode_args.inode now. */
748
749 ret = btrfs_record_root_in_trans(trans, new_root);
750 if (ret) {
751 btrfs_abort_transaction(trans, ret);
752 goto out;
753 }
754
755 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
756 BTRFS_UUID_KEY_SUBVOL, objectid);
757 if (ret) {
758 btrfs_abort_transaction(trans, ret);
759 goto out;
760 }
761
762 ret = btrfs_create_new_inode(trans, &new_inode_args);
763 if (ret) {
764 btrfs_abort_transaction(trans, ret);
765 goto out;
766 }
767
768 btrfs_record_new_subvolume(trans, BTRFS_I(dir));
769
770 d_instantiate_new(dentry, new_inode_args.inode);
771 new_inode_args.inode = NULL;
772
773out:
774 trans->block_rsv = NULL;
775 trans->bytes_reserved = 0;
776 btrfs_end_transaction(trans);
777out_release_rsv:
778 btrfs_block_rsv_release(fs_info, &block_rsv, (u64)-1, NULL);
779 if (qgroup_reserved)
780 btrfs_qgroup_free_meta_prealloc(root, qgroup_reserved);
781out_new_inode_args:
782 btrfs_new_inode_args_destroy(&new_inode_args);
783out_inode:
784 iput(new_inode_args.inode);
785out_anon_dev:
786 if (anon_dev)
787 free_anon_bdev(anon_dev);
788out_root_item:
789 kfree(root_item);
790 return ret;
791}
792
793static int create_snapshot(struct btrfs_root *root, struct inode *dir,
794 struct dentry *dentry, bool readonly,
795 struct btrfs_qgroup_inherit *inherit)
796{
797 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
798 struct inode *inode;
799 struct btrfs_pending_snapshot *pending_snapshot;
800 unsigned int trans_num_items;
801 struct btrfs_trans_handle *trans;
802 struct btrfs_block_rsv *block_rsv;
803 u64 qgroup_reserved = 0;
804 int ret;
805
806 /* We do not support snapshotting right now. */
807 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
808 btrfs_warn(fs_info,
809 "extent tree v2 doesn't support snapshotting yet");
810 return -EOPNOTSUPP;
811 }
812
813 if (btrfs_root_refs(&root->root_item) == 0)
814 return -ENOENT;
815
816 if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
817 return -EINVAL;
818
819 if (atomic_read(&root->nr_swapfiles)) {
820 btrfs_warn(fs_info,
821 "cannot snapshot subvolume with active swapfile");
822 return -ETXTBSY;
823 }
824
825 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
826 if (!pending_snapshot)
827 return -ENOMEM;
828
829 ret = get_anon_bdev(&pending_snapshot->anon_dev);
830 if (ret < 0)
831 goto free_pending;
832 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
833 GFP_KERNEL);
834 pending_snapshot->path = btrfs_alloc_path();
835 if (!pending_snapshot->root_item || !pending_snapshot->path) {
836 ret = -ENOMEM;
837 goto free_pending;
838 }
839
840 block_rsv = &pending_snapshot->block_rsv;
841 btrfs_init_block_rsv(block_rsv, BTRFS_BLOCK_RSV_TEMP);
842 /*
843 * 1 to add dir item
844 * 1 to add dir index
845 * 1 to update parent inode item
846 */
847 trans_num_items = create_subvol_num_items(inherit) + 3;
848 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, block_rsv,
849 trans_num_items, false);
850 if (ret)
851 goto free_pending;
852 qgroup_reserved = block_rsv->qgroup_rsv_reserved;
853
854 pending_snapshot->dentry = dentry;
855 pending_snapshot->root = root;
856 pending_snapshot->readonly = readonly;
857 pending_snapshot->dir = BTRFS_I(dir);
858 pending_snapshot->inherit = inherit;
859
860 trans = btrfs_start_transaction(root, 0);
861 if (IS_ERR(trans)) {
862 ret = PTR_ERR(trans);
863 goto fail;
864 }
865 ret = btrfs_record_root_in_trans(trans, BTRFS_I(dir)->root);
866 if (ret) {
867 btrfs_end_transaction(trans);
868 goto fail;
869 }
870 btrfs_qgroup_convert_reserved_meta(root, qgroup_reserved);
871 qgroup_reserved = 0;
872
873 trans->pending_snapshot = pending_snapshot;
874
875 ret = btrfs_commit_transaction(trans);
876 if (ret)
877 goto fail;
878
879 ret = pending_snapshot->error;
880 if (ret)
881 goto fail;
882
883 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
884 if (ret)
885 goto fail;
886
887 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
888 if (IS_ERR(inode)) {
889 ret = PTR_ERR(inode);
890 goto fail;
891 }
892
893 d_instantiate(dentry, inode);
894 ret = 0;
895 pending_snapshot->anon_dev = 0;
896fail:
897 /* Prevent double freeing of anon_dev */
898 if (ret && pending_snapshot->snap)
899 pending_snapshot->snap->anon_dev = 0;
900 btrfs_put_root(pending_snapshot->snap);
901 btrfs_block_rsv_release(fs_info, block_rsv, (u64)-1, NULL);
902 if (qgroup_reserved)
903 btrfs_qgroup_free_meta_prealloc(root, qgroup_reserved);
904free_pending:
905 if (pending_snapshot->anon_dev)
906 free_anon_bdev(pending_snapshot->anon_dev);
907 kfree(pending_snapshot->root_item);
908 btrfs_free_path(pending_snapshot->path);
909 kfree(pending_snapshot);
910
911 return ret;
912}
913
914/* copy of may_delete in fs/namei.c()
915 * Check whether we can remove a link victim from directory dir, check
916 * whether the type of victim is right.
917 * 1. We can't do it if dir is read-only (done in permission())
918 * 2. We should have write and exec permissions on dir
919 * 3. We can't remove anything from append-only dir
920 * 4. We can't do anything with immutable dir (done in permission())
921 * 5. If the sticky bit on dir is set we should either
922 * a. be owner of dir, or
923 * b. be owner of victim, or
924 * c. have CAP_FOWNER capability
925 * 6. If the victim is append-only or immutable we can't do anything with
926 * links pointing to it.
927 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
928 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
929 * 9. We can't remove a root or mountpoint.
930 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
931 * nfs_async_unlink().
932 */
933
934static int btrfs_may_delete(struct mnt_idmap *idmap,
935 struct inode *dir, struct dentry *victim, int isdir)
936{
937 int error;
938
939 if (d_really_is_negative(victim))
940 return -ENOENT;
941
942 /* The @victim is not inside @dir. */
943 if (d_inode(victim->d_parent) != dir)
944 return -EINVAL;
945 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
946
947 error = inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC);
948 if (error)
949 return error;
950 if (IS_APPEND(dir))
951 return -EPERM;
952 if (check_sticky(idmap, dir, d_inode(victim)) ||
953 IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
954 IS_SWAPFILE(d_inode(victim)))
955 return -EPERM;
956 if (isdir) {
957 if (!d_is_dir(victim))
958 return -ENOTDIR;
959 if (IS_ROOT(victim))
960 return -EBUSY;
961 } else if (d_is_dir(victim))
962 return -EISDIR;
963 if (IS_DEADDIR(dir))
964 return -ENOENT;
965 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
966 return -EBUSY;
967 return 0;
968}
969
970/* copy of may_create in fs/namei.c() */
971static inline int btrfs_may_create(struct mnt_idmap *idmap,
972 struct inode *dir, struct dentry *child)
973{
974 if (d_really_is_positive(child))
975 return -EEXIST;
976 if (IS_DEADDIR(dir))
977 return -ENOENT;
978 if (!fsuidgid_has_mapping(dir->i_sb, idmap))
979 return -EOVERFLOW;
980 return inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC);
981}
982
983/*
984 * Create a new subvolume below @parent. This is largely modeled after
985 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
986 * inside this filesystem so it's quite a bit simpler.
987 */
988static noinline int btrfs_mksubvol(const struct path *parent,
989 struct mnt_idmap *idmap,
990 const char *name, int namelen,
991 struct btrfs_root *snap_src,
992 bool readonly,
993 struct btrfs_qgroup_inherit *inherit)
994{
995 struct inode *dir = d_inode(parent->dentry);
996 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
997 struct dentry *dentry;
998 struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen);
999 int error;
1000
1001 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
1002 if (error == -EINTR)
1003 return error;
1004
1005 dentry = lookup_one(idmap, name, parent->dentry, namelen);
1006 error = PTR_ERR(dentry);
1007 if (IS_ERR(dentry))
1008 goto out_unlock;
1009
1010 error = btrfs_may_create(idmap, dir, dentry);
1011 if (error)
1012 goto out_dput;
1013
1014 /*
1015 * even if this name doesn't exist, we may get hash collisions.
1016 * check for them now when we can safely fail
1017 */
1018 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
1019 dir->i_ino, &name_str);
1020 if (error)
1021 goto out_dput;
1022
1023 down_read(&fs_info->subvol_sem);
1024
1025 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
1026 goto out_up_read;
1027
1028 if (snap_src)
1029 error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
1030 else
1031 error = create_subvol(idmap, dir, dentry, inherit);
1032
1033 if (!error)
1034 fsnotify_mkdir(dir, dentry);
1035out_up_read:
1036 up_read(&fs_info->subvol_sem);
1037out_dput:
1038 dput(dentry);
1039out_unlock:
1040 btrfs_inode_unlock(BTRFS_I(dir), 0);
1041 return error;
1042}
1043
1044static noinline int btrfs_mksnapshot(const struct path *parent,
1045 struct mnt_idmap *idmap,
1046 const char *name, int namelen,
1047 struct btrfs_root *root,
1048 bool readonly,
1049 struct btrfs_qgroup_inherit *inherit)
1050{
1051 int ret;
1052
1053 /*
1054 * Force new buffered writes to reserve space even when NOCOW is
1055 * possible. This is to avoid later writeback (running dealloc) to
1056 * fallback to COW mode and unexpectedly fail with ENOSPC.
1057 */
1058 btrfs_drew_read_lock(&root->snapshot_lock);
1059
1060 ret = btrfs_start_delalloc_snapshot(root, false);
1061 if (ret)
1062 goto out;
1063
1064 /*
1065 * All previous writes have started writeback in NOCOW mode, so now
1066 * we force future writes to fallback to COW mode during snapshot
1067 * creation.
1068 */
1069 atomic_inc(&root->snapshot_force_cow);
1070
1071 btrfs_wait_ordered_extents(root, U64_MAX, NULL);
1072
1073 ret = btrfs_mksubvol(parent, idmap, name, namelen,
1074 root, readonly, inherit);
1075 atomic_dec(&root->snapshot_force_cow);
1076out:
1077 btrfs_drew_read_unlock(&root->snapshot_lock);
1078 return ret;
1079}
1080
1081/*
1082 * Try to start exclusive operation @type or cancel it if it's running.
1083 *
1084 * Return:
1085 * 0 - normal mode, newly claimed op started
1086 * >0 - normal mode, something else is running,
1087 * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space
1088 * ECANCELED - cancel mode, successful cancel
1089 * ENOTCONN - cancel mode, operation not running anymore
1090 */
1091static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info,
1092 enum btrfs_exclusive_operation type, bool cancel)
1093{
1094 if (!cancel) {
1095 /* Start normal op */
1096 if (!btrfs_exclop_start(fs_info, type))
1097 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1098 /* Exclusive operation is now claimed */
1099 return 0;
1100 }
1101
1102 /* Cancel running op */
1103 if (btrfs_exclop_start_try_lock(fs_info, type)) {
1104 /*
1105 * This blocks any exclop finish from setting it to NONE, so we
1106 * request cancellation. Either it runs and we will wait for it,
1107 * or it has finished and no waiting will happen.
1108 */
1109 atomic_inc(&fs_info->reloc_cancel_req);
1110 btrfs_exclop_start_unlock(fs_info);
1111
1112 if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags))
1113 wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING,
1114 TASK_INTERRUPTIBLE);
1115
1116 return -ECANCELED;
1117 }
1118
1119 /* Something else is running or none */
1120 return -ENOTCONN;
1121}
1122
1123static noinline int btrfs_ioctl_resize(struct file *file,
1124 void __user *arg)
1125{
1126 BTRFS_DEV_LOOKUP_ARGS(args);
1127 struct inode *inode = file_inode(file);
1128 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
1129 u64 new_size;
1130 u64 old_size;
1131 u64 devid = 1;
1132 struct btrfs_root *root = BTRFS_I(inode)->root;
1133 struct btrfs_ioctl_vol_args *vol_args;
1134 struct btrfs_trans_handle *trans;
1135 struct btrfs_device *device = NULL;
1136 char *sizestr;
1137 char *retptr;
1138 char *devstr = NULL;
1139 int ret = 0;
1140 int mod = 0;
1141 bool cancel;
1142
1143 if (!capable(CAP_SYS_ADMIN))
1144 return -EPERM;
1145
1146 ret = mnt_want_write_file(file);
1147 if (ret)
1148 return ret;
1149
1150 /*
1151 * Read the arguments before checking exclusivity to be able to
1152 * distinguish regular resize and cancel
1153 */
1154 vol_args = memdup_user(arg, sizeof(*vol_args));
1155 if (IS_ERR(vol_args)) {
1156 ret = PTR_ERR(vol_args);
1157 goto out_drop;
1158 }
1159 ret = btrfs_check_ioctl_vol_args_path(vol_args);
1160 if (ret < 0)
1161 goto out_free;
1162
1163 sizestr = vol_args->name;
1164 cancel = (strcmp("cancel", sizestr) == 0);
1165 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel);
1166 if (ret)
1167 goto out_free;
1168 /* Exclusive operation is now claimed */
1169
1170 devstr = strchr(sizestr, ':');
1171 if (devstr) {
1172 sizestr = devstr + 1;
1173 *devstr = '\0';
1174 devstr = vol_args->name;
1175 ret = kstrtoull(devstr, 10, &devid);
1176 if (ret)
1177 goto out_finish;
1178 if (!devid) {
1179 ret = -EINVAL;
1180 goto out_finish;
1181 }
1182 btrfs_info(fs_info, "resizing devid %llu", devid);
1183 }
1184
1185 args.devid = devid;
1186 device = btrfs_find_device(fs_info->fs_devices, &args);
1187 if (!device) {
1188 btrfs_info(fs_info, "resizer unable to find device %llu",
1189 devid);
1190 ret = -ENODEV;
1191 goto out_finish;
1192 }
1193
1194 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1195 btrfs_info(fs_info,
1196 "resizer unable to apply on readonly device %llu",
1197 devid);
1198 ret = -EPERM;
1199 goto out_finish;
1200 }
1201
1202 if (!strcmp(sizestr, "max"))
1203 new_size = bdev_nr_bytes(device->bdev);
1204 else {
1205 if (sizestr[0] == '-') {
1206 mod = -1;
1207 sizestr++;
1208 } else if (sizestr[0] == '+') {
1209 mod = 1;
1210 sizestr++;
1211 }
1212 new_size = memparse(sizestr, &retptr);
1213 if (*retptr != '\0' || new_size == 0) {
1214 ret = -EINVAL;
1215 goto out_finish;
1216 }
1217 }
1218
1219 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1220 ret = -EPERM;
1221 goto out_finish;
1222 }
1223
1224 old_size = btrfs_device_get_total_bytes(device);
1225
1226 if (mod < 0) {
1227 if (new_size > old_size) {
1228 ret = -EINVAL;
1229 goto out_finish;
1230 }
1231 new_size = old_size - new_size;
1232 } else if (mod > 0) {
1233 if (new_size > ULLONG_MAX - old_size) {
1234 ret = -ERANGE;
1235 goto out_finish;
1236 }
1237 new_size = old_size + new_size;
1238 }
1239
1240 if (new_size < SZ_256M) {
1241 ret = -EINVAL;
1242 goto out_finish;
1243 }
1244 if (new_size > bdev_nr_bytes(device->bdev)) {
1245 ret = -EFBIG;
1246 goto out_finish;
1247 }
1248
1249 new_size = round_down(new_size, fs_info->sectorsize);
1250
1251 if (new_size > old_size) {
1252 trans = btrfs_start_transaction(root, 0);
1253 if (IS_ERR(trans)) {
1254 ret = PTR_ERR(trans);
1255 goto out_finish;
1256 }
1257 ret = btrfs_grow_device(trans, device, new_size);
1258 btrfs_commit_transaction(trans);
1259 } else if (new_size < old_size) {
1260 ret = btrfs_shrink_device(device, new_size);
1261 } /* equal, nothing need to do */
1262
1263 if (ret == 0 && new_size != old_size)
1264 btrfs_info_in_rcu(fs_info,
1265 "resize device %s (devid %llu) from %llu to %llu",
1266 btrfs_dev_name(device), device->devid,
1267 old_size, new_size);
1268out_finish:
1269 btrfs_exclop_finish(fs_info);
1270out_free:
1271 kfree(vol_args);
1272out_drop:
1273 mnt_drop_write_file(file);
1274 return ret;
1275}
1276
1277static noinline int __btrfs_ioctl_snap_create(struct file *file,
1278 struct mnt_idmap *idmap,
1279 const char *name, unsigned long fd, int subvol,
1280 bool readonly,
1281 struct btrfs_qgroup_inherit *inherit)
1282{
1283 int namelen;
1284 int ret = 0;
1285
1286 if (!S_ISDIR(file_inode(file)->i_mode))
1287 return -ENOTDIR;
1288
1289 ret = mnt_want_write_file(file);
1290 if (ret)
1291 goto out;
1292
1293 namelen = strlen(name);
1294 if (strchr(name, '/')) {
1295 ret = -EINVAL;
1296 goto out_drop_write;
1297 }
1298
1299 if (name[0] == '.' &&
1300 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1301 ret = -EEXIST;
1302 goto out_drop_write;
1303 }
1304
1305 if (subvol) {
1306 ret = btrfs_mksubvol(&file->f_path, idmap, name,
1307 namelen, NULL, readonly, inherit);
1308 } else {
1309 CLASS(fd, src)(fd);
1310 struct inode *src_inode;
1311 if (fd_empty(src)) {
1312 ret = -EINVAL;
1313 goto out_drop_write;
1314 }
1315
1316 src_inode = file_inode(fd_file(src));
1317 if (src_inode->i_sb != file_inode(file)->i_sb) {
1318 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1319 "Snapshot src from another FS");
1320 ret = -EXDEV;
1321 } else if (!inode_owner_or_capable(idmap, src_inode)) {
1322 /*
1323 * Subvolume creation is not restricted, but snapshots
1324 * are limited to own subvolumes only
1325 */
1326 ret = -EPERM;
1327 } else if (btrfs_ino(BTRFS_I(src_inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1328 /*
1329 * Snapshots must be made with the src_inode referring
1330 * to the subvolume inode, otherwise the permission
1331 * checking above is useless because we may have
1332 * permission on a lower directory but not the subvol
1333 * itself.
1334 */
1335 ret = -EINVAL;
1336 } else {
1337 ret = btrfs_mksnapshot(&file->f_path, idmap,
1338 name, namelen,
1339 BTRFS_I(src_inode)->root,
1340 readonly, inherit);
1341 }
1342 }
1343out_drop_write:
1344 mnt_drop_write_file(file);
1345out:
1346 return ret;
1347}
1348
1349static noinline int btrfs_ioctl_snap_create(struct file *file,
1350 void __user *arg, int subvol)
1351{
1352 struct btrfs_ioctl_vol_args *vol_args;
1353 int ret;
1354
1355 if (!S_ISDIR(file_inode(file)->i_mode))
1356 return -ENOTDIR;
1357
1358 vol_args = memdup_user(arg, sizeof(*vol_args));
1359 if (IS_ERR(vol_args))
1360 return PTR_ERR(vol_args);
1361 ret = btrfs_check_ioctl_vol_args_path(vol_args);
1362 if (ret < 0)
1363 goto out;
1364
1365 ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file),
1366 vol_args->name, vol_args->fd, subvol,
1367 false, NULL);
1368
1369out:
1370 kfree(vol_args);
1371 return ret;
1372}
1373
1374static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1375 void __user *arg, int subvol)
1376{
1377 struct btrfs_ioctl_vol_args_v2 *vol_args;
1378 int ret;
1379 bool readonly = false;
1380 struct btrfs_qgroup_inherit *inherit = NULL;
1381
1382 if (!S_ISDIR(file_inode(file)->i_mode))
1383 return -ENOTDIR;
1384
1385 vol_args = memdup_user(arg, sizeof(*vol_args));
1386 if (IS_ERR(vol_args))
1387 return PTR_ERR(vol_args);
1388 ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args);
1389 if (ret < 0)
1390 goto free_args;
1391
1392 if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
1393 ret = -EOPNOTSUPP;
1394 goto free_args;
1395 }
1396
1397 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1398 readonly = true;
1399 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1400 struct btrfs_fs_info *fs_info = inode_to_fs_info(file_inode(file));
1401
1402 if (vol_args->size < sizeof(*inherit) ||
1403 vol_args->size > PAGE_SIZE) {
1404 ret = -EINVAL;
1405 goto free_args;
1406 }
1407 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1408 if (IS_ERR(inherit)) {
1409 ret = PTR_ERR(inherit);
1410 goto free_args;
1411 }
1412
1413 ret = btrfs_qgroup_check_inherit(fs_info, inherit, vol_args->size);
1414 if (ret < 0)
1415 goto free_inherit;
1416 }
1417
1418 ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file),
1419 vol_args->name, vol_args->fd, subvol,
1420 readonly, inherit);
1421 if (ret)
1422 goto free_inherit;
1423free_inherit:
1424 kfree(inherit);
1425free_args:
1426 kfree(vol_args);
1427 return ret;
1428}
1429
1430static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode,
1431 void __user *arg)
1432{
1433 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
1434 struct btrfs_root *root = BTRFS_I(inode)->root;
1435 int ret = 0;
1436 u64 flags = 0;
1437
1438 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1439 return -EINVAL;
1440
1441 down_read(&fs_info->subvol_sem);
1442 if (btrfs_root_readonly(root))
1443 flags |= BTRFS_SUBVOL_RDONLY;
1444 up_read(&fs_info->subvol_sem);
1445
1446 if (copy_to_user(arg, &flags, sizeof(flags)))
1447 ret = -EFAULT;
1448
1449 return ret;
1450}
1451
1452static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1453 void __user *arg)
1454{
1455 struct inode *inode = file_inode(file);
1456 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
1457 struct btrfs_root *root = BTRFS_I(inode)->root;
1458 struct btrfs_trans_handle *trans;
1459 u64 root_flags;
1460 u64 flags;
1461 int ret = 0;
1462
1463 if (!inode_owner_or_capable(file_mnt_idmap(file), inode))
1464 return -EPERM;
1465
1466 ret = mnt_want_write_file(file);
1467 if (ret)
1468 goto out;
1469
1470 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1471 ret = -EINVAL;
1472 goto out_drop_write;
1473 }
1474
1475 if (copy_from_user(&flags, arg, sizeof(flags))) {
1476 ret = -EFAULT;
1477 goto out_drop_write;
1478 }
1479
1480 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1481 ret = -EOPNOTSUPP;
1482 goto out_drop_write;
1483 }
1484
1485 down_write(&fs_info->subvol_sem);
1486
1487 /* nothing to do */
1488 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1489 goto out_drop_sem;
1490
1491 root_flags = btrfs_root_flags(&root->root_item);
1492 if (flags & BTRFS_SUBVOL_RDONLY) {
1493 btrfs_set_root_flags(&root->root_item,
1494 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1495 } else {
1496 /*
1497 * Block RO -> RW transition if this subvolume is involved in
1498 * send
1499 */
1500 spin_lock(&root->root_item_lock);
1501 if (root->send_in_progress == 0) {
1502 btrfs_set_root_flags(&root->root_item,
1503 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1504 spin_unlock(&root->root_item_lock);
1505 } else {
1506 spin_unlock(&root->root_item_lock);
1507 btrfs_warn(fs_info,
1508 "Attempt to set subvolume %llu read-write during send",
1509 btrfs_root_id(root));
1510 ret = -EPERM;
1511 goto out_drop_sem;
1512 }
1513 }
1514
1515 trans = btrfs_start_transaction(root, 1);
1516 if (IS_ERR(trans)) {
1517 ret = PTR_ERR(trans);
1518 goto out_reset;
1519 }
1520
1521 ret = btrfs_update_root(trans, fs_info->tree_root,
1522 &root->root_key, &root->root_item);
1523 if (ret < 0) {
1524 btrfs_end_transaction(trans);
1525 goto out_reset;
1526 }
1527
1528 ret = btrfs_commit_transaction(trans);
1529
1530out_reset:
1531 if (ret)
1532 btrfs_set_root_flags(&root->root_item, root_flags);
1533out_drop_sem:
1534 up_write(&fs_info->subvol_sem);
1535out_drop_write:
1536 mnt_drop_write_file(file);
1537out:
1538 return ret;
1539}
1540
1541static noinline int key_in_sk(struct btrfs_key *key,
1542 struct btrfs_ioctl_search_key *sk)
1543{
1544 struct btrfs_key test;
1545 int ret;
1546
1547 test.objectid = sk->min_objectid;
1548 test.type = sk->min_type;
1549 test.offset = sk->min_offset;
1550
1551 ret = btrfs_comp_cpu_keys(key, &test);
1552 if (ret < 0)
1553 return 0;
1554
1555 test.objectid = sk->max_objectid;
1556 test.type = sk->max_type;
1557 test.offset = sk->max_offset;
1558
1559 ret = btrfs_comp_cpu_keys(key, &test);
1560 if (ret > 0)
1561 return 0;
1562 return 1;
1563}
1564
1565static noinline int copy_to_sk(struct btrfs_path *path,
1566 struct btrfs_key *key,
1567 struct btrfs_ioctl_search_key *sk,
1568 u64 *buf_size,
1569 char __user *ubuf,
1570 unsigned long *sk_offset,
1571 int *num_found)
1572{
1573 u64 found_transid;
1574 struct extent_buffer *leaf;
1575 struct btrfs_ioctl_search_header sh;
1576 struct btrfs_key test;
1577 unsigned long item_off;
1578 unsigned long item_len;
1579 int nritems;
1580 int i;
1581 int slot;
1582 int ret = 0;
1583
1584 leaf = path->nodes[0];
1585 slot = path->slots[0];
1586 nritems = btrfs_header_nritems(leaf);
1587
1588 if (btrfs_header_generation(leaf) > sk->max_transid) {
1589 i = nritems;
1590 goto advance_key;
1591 }
1592 found_transid = btrfs_header_generation(leaf);
1593
1594 for (i = slot; i < nritems; i++) {
1595 item_off = btrfs_item_ptr_offset(leaf, i);
1596 item_len = btrfs_item_size(leaf, i);
1597
1598 btrfs_item_key_to_cpu(leaf, key, i);
1599 if (!key_in_sk(key, sk))
1600 continue;
1601
1602 if (sizeof(sh) + item_len > *buf_size) {
1603 if (*num_found) {
1604 ret = 1;
1605 goto out;
1606 }
1607
1608 /*
1609 * return one empty item back for v1, which does not
1610 * handle -EOVERFLOW
1611 */
1612
1613 *buf_size = sizeof(sh) + item_len;
1614 item_len = 0;
1615 ret = -EOVERFLOW;
1616 }
1617
1618 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1619 ret = 1;
1620 goto out;
1621 }
1622
1623 sh.objectid = key->objectid;
1624 sh.offset = key->offset;
1625 sh.type = key->type;
1626 sh.len = item_len;
1627 sh.transid = found_transid;
1628
1629 /*
1630 * Copy search result header. If we fault then loop again so we
1631 * can fault in the pages and -EFAULT there if there's a
1632 * problem. Otherwise we'll fault and then copy the buffer in
1633 * properly this next time through
1634 */
1635 if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
1636 ret = 0;
1637 goto out;
1638 }
1639
1640 *sk_offset += sizeof(sh);
1641
1642 if (item_len) {
1643 char __user *up = ubuf + *sk_offset;
1644 /*
1645 * Copy the item, same behavior as above, but reset the
1646 * * sk_offset so we copy the full thing again.
1647 */
1648 if (read_extent_buffer_to_user_nofault(leaf, up,
1649 item_off, item_len)) {
1650 ret = 0;
1651 *sk_offset -= sizeof(sh);
1652 goto out;
1653 }
1654
1655 *sk_offset += item_len;
1656 }
1657 (*num_found)++;
1658
1659 if (ret) /* -EOVERFLOW from above */
1660 goto out;
1661
1662 if (*num_found >= sk->nr_items) {
1663 ret = 1;
1664 goto out;
1665 }
1666 }
1667advance_key:
1668 ret = 0;
1669 test.objectid = sk->max_objectid;
1670 test.type = sk->max_type;
1671 test.offset = sk->max_offset;
1672 if (btrfs_comp_cpu_keys(key, &test) >= 0)
1673 ret = 1;
1674 else if (key->offset < (u64)-1)
1675 key->offset++;
1676 else if (key->type < (u8)-1) {
1677 key->offset = 0;
1678 key->type++;
1679 } else if (key->objectid < (u64)-1) {
1680 key->offset = 0;
1681 key->type = 0;
1682 key->objectid++;
1683 } else
1684 ret = 1;
1685out:
1686 /*
1687 * 0: all items from this leaf copied, continue with next
1688 * 1: * more items can be copied, but unused buffer is too small
1689 * * all items were found
1690 * Either way, it will stops the loop which iterates to the next
1691 * leaf
1692 * -EOVERFLOW: item was to large for buffer
1693 * -EFAULT: could not copy extent buffer back to userspace
1694 */
1695 return ret;
1696}
1697
1698static noinline int search_ioctl(struct inode *inode,
1699 struct btrfs_ioctl_search_key *sk,
1700 u64 *buf_size,
1701 char __user *ubuf)
1702{
1703 struct btrfs_fs_info *info = inode_to_fs_info(inode);
1704 struct btrfs_root *root;
1705 struct btrfs_key key;
1706 struct btrfs_path *path;
1707 int ret;
1708 int num_found = 0;
1709 unsigned long sk_offset = 0;
1710
1711 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
1712 *buf_size = sizeof(struct btrfs_ioctl_search_header);
1713 return -EOVERFLOW;
1714 }
1715
1716 path = btrfs_alloc_path();
1717 if (!path)
1718 return -ENOMEM;
1719
1720 if (sk->tree_id == 0) {
1721 /* search the root of the inode that was passed */
1722 root = btrfs_grab_root(BTRFS_I(inode)->root);
1723 } else {
1724 root = btrfs_get_fs_root(info, sk->tree_id, true);
1725 if (IS_ERR(root)) {
1726 btrfs_free_path(path);
1727 return PTR_ERR(root);
1728 }
1729 }
1730
1731 key.objectid = sk->min_objectid;
1732 key.type = sk->min_type;
1733 key.offset = sk->min_offset;
1734
1735 while (1) {
1736 ret = -EFAULT;
1737 /*
1738 * Ensure that the whole user buffer is faulted in at sub-page
1739 * granularity, otherwise the loop may live-lock.
1740 */
1741 if (fault_in_subpage_writeable(ubuf + sk_offset,
1742 *buf_size - sk_offset))
1743 break;
1744
1745 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
1746 if (ret != 0) {
1747 if (ret > 0)
1748 ret = 0;
1749 goto err;
1750 }
1751 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
1752 &sk_offset, &num_found);
1753 btrfs_release_path(path);
1754 if (ret)
1755 break;
1756
1757 }
1758 if (ret > 0)
1759 ret = 0;
1760err:
1761 sk->nr_items = num_found;
1762 btrfs_put_root(root);
1763 btrfs_free_path(path);
1764 return ret;
1765}
1766
1767static noinline int btrfs_ioctl_tree_search(struct inode *inode,
1768 void __user *argp)
1769{
1770 struct btrfs_ioctl_search_args __user *uargs = argp;
1771 struct btrfs_ioctl_search_key sk;
1772 int ret;
1773 u64 buf_size;
1774
1775 if (!capable(CAP_SYS_ADMIN))
1776 return -EPERM;
1777
1778 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
1779 return -EFAULT;
1780
1781 buf_size = sizeof(uargs->buf);
1782
1783 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
1784
1785 /*
1786 * In the origin implementation an overflow is handled by returning a
1787 * search header with a len of zero, so reset ret.
1788 */
1789 if (ret == -EOVERFLOW)
1790 ret = 0;
1791
1792 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
1793 ret = -EFAULT;
1794 return ret;
1795}
1796
1797static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode,
1798 void __user *argp)
1799{
1800 struct btrfs_ioctl_search_args_v2 __user *uarg = argp;
1801 struct btrfs_ioctl_search_args_v2 args;
1802 int ret;
1803 u64 buf_size;
1804 const u64 buf_limit = SZ_16M;
1805
1806 if (!capable(CAP_SYS_ADMIN))
1807 return -EPERM;
1808
1809 /* copy search header and buffer size */
1810 if (copy_from_user(&args, uarg, sizeof(args)))
1811 return -EFAULT;
1812
1813 buf_size = args.buf_size;
1814
1815 /* limit result size to 16MB */
1816 if (buf_size > buf_limit)
1817 buf_size = buf_limit;
1818
1819 ret = search_ioctl(inode, &args.key, &buf_size,
1820 (char __user *)(&uarg->buf[0]));
1821 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
1822 ret = -EFAULT;
1823 else if (ret == -EOVERFLOW &&
1824 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
1825 ret = -EFAULT;
1826
1827 return ret;
1828}
1829
1830/*
1831 * Search INODE_REFs to identify path name of 'dirid' directory
1832 * in a 'tree_id' tree. and sets path name to 'name'.
1833 */
1834static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1835 u64 tree_id, u64 dirid, char *name)
1836{
1837 struct btrfs_root *root;
1838 struct btrfs_key key;
1839 char *ptr;
1840 int ret = -1;
1841 int slot;
1842 int len;
1843 int total_len = 0;
1844 struct btrfs_inode_ref *iref;
1845 struct extent_buffer *l;
1846 struct btrfs_path *path;
1847
1848 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1849 name[0]='\0';
1850 return 0;
1851 }
1852
1853 path = btrfs_alloc_path();
1854 if (!path)
1855 return -ENOMEM;
1856
1857 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
1858
1859 root = btrfs_get_fs_root(info, tree_id, true);
1860 if (IS_ERR(root)) {
1861 ret = PTR_ERR(root);
1862 root = NULL;
1863 goto out;
1864 }
1865
1866 key.objectid = dirid;
1867 key.type = BTRFS_INODE_REF_KEY;
1868 key.offset = (u64)-1;
1869
1870 while (1) {
1871 ret = btrfs_search_backwards(root, &key, path);
1872 if (ret < 0)
1873 goto out;
1874 else if (ret > 0) {
1875 ret = -ENOENT;
1876 goto out;
1877 }
1878
1879 l = path->nodes[0];
1880 slot = path->slots[0];
1881
1882 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1883 len = btrfs_inode_ref_name_len(l, iref);
1884 ptr -= len + 1;
1885 total_len += len + 1;
1886 if (ptr < name) {
1887 ret = -ENAMETOOLONG;
1888 goto out;
1889 }
1890
1891 *(ptr + len) = '/';
1892 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
1893
1894 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1895 break;
1896
1897 btrfs_release_path(path);
1898 key.objectid = key.offset;
1899 key.offset = (u64)-1;
1900 dirid = key.objectid;
1901 }
1902 memmove(name, ptr, total_len);
1903 name[total_len] = '\0';
1904 ret = 0;
1905out:
1906 btrfs_put_root(root);
1907 btrfs_free_path(path);
1908 return ret;
1909}
1910
1911static int btrfs_search_path_in_tree_user(struct mnt_idmap *idmap,
1912 struct inode *inode,
1913 struct btrfs_ioctl_ino_lookup_user_args *args)
1914{
1915 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
1916 u64 upper_limit = btrfs_ino(BTRFS_I(inode));
1917 u64 treeid = btrfs_root_id(BTRFS_I(inode)->root);
1918 u64 dirid = args->dirid;
1919 unsigned long item_off;
1920 unsigned long item_len;
1921 struct btrfs_inode_ref *iref;
1922 struct btrfs_root_ref *rref;
1923 struct btrfs_root *root = NULL;
1924 struct btrfs_path *path;
1925 struct btrfs_key key, key2;
1926 struct extent_buffer *leaf;
1927 struct inode *temp_inode;
1928 char *ptr;
1929 int slot;
1930 int len;
1931 int total_len = 0;
1932 int ret;
1933
1934 path = btrfs_alloc_path();
1935 if (!path)
1936 return -ENOMEM;
1937
1938 /*
1939 * If the bottom subvolume does not exist directly under upper_limit,
1940 * construct the path in from the bottom up.
1941 */
1942 if (dirid != upper_limit) {
1943 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
1944
1945 root = btrfs_get_fs_root(fs_info, treeid, true);
1946 if (IS_ERR(root)) {
1947 ret = PTR_ERR(root);
1948 goto out;
1949 }
1950
1951 key.objectid = dirid;
1952 key.type = BTRFS_INODE_REF_KEY;
1953 key.offset = (u64)-1;
1954 while (1) {
1955 ret = btrfs_search_backwards(root, &key, path);
1956 if (ret < 0)
1957 goto out_put;
1958 else if (ret > 0) {
1959 ret = -ENOENT;
1960 goto out_put;
1961 }
1962
1963 leaf = path->nodes[0];
1964 slot = path->slots[0];
1965
1966 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
1967 len = btrfs_inode_ref_name_len(leaf, iref);
1968 ptr -= len + 1;
1969 total_len += len + 1;
1970 if (ptr < args->path) {
1971 ret = -ENAMETOOLONG;
1972 goto out_put;
1973 }
1974
1975 *(ptr + len) = '/';
1976 read_extent_buffer(leaf, ptr,
1977 (unsigned long)(iref + 1), len);
1978
1979 /* Check the read+exec permission of this directory */
1980 ret = btrfs_previous_item(root, path, dirid,
1981 BTRFS_INODE_ITEM_KEY);
1982 if (ret < 0) {
1983 goto out_put;
1984 } else if (ret > 0) {
1985 ret = -ENOENT;
1986 goto out_put;
1987 }
1988
1989 leaf = path->nodes[0];
1990 slot = path->slots[0];
1991 btrfs_item_key_to_cpu(leaf, &key2, slot);
1992 if (key2.objectid != dirid) {
1993 ret = -ENOENT;
1994 goto out_put;
1995 }
1996
1997 /*
1998 * We don't need the path anymore, so release it and
1999 * avoid deadlocks and lockdep warnings in case
2000 * btrfs_iget() needs to lookup the inode from its root
2001 * btree and lock the same leaf.
2002 */
2003 btrfs_release_path(path);
2004 temp_inode = btrfs_iget(key2.objectid, root);
2005 if (IS_ERR(temp_inode)) {
2006 ret = PTR_ERR(temp_inode);
2007 goto out_put;
2008 }
2009 ret = inode_permission(idmap, temp_inode,
2010 MAY_READ | MAY_EXEC);
2011 iput(temp_inode);
2012 if (ret) {
2013 ret = -EACCES;
2014 goto out_put;
2015 }
2016
2017 if (key.offset == upper_limit)
2018 break;
2019 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2020 ret = -EACCES;
2021 goto out_put;
2022 }
2023
2024 key.objectid = key.offset;
2025 key.offset = (u64)-1;
2026 dirid = key.objectid;
2027 }
2028
2029 memmove(args->path, ptr, total_len);
2030 args->path[total_len] = '\0';
2031 btrfs_put_root(root);
2032 root = NULL;
2033 btrfs_release_path(path);
2034 }
2035
2036 /* Get the bottom subvolume's name from ROOT_REF */
2037 key.objectid = treeid;
2038 key.type = BTRFS_ROOT_REF_KEY;
2039 key.offset = args->treeid;
2040 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2041 if (ret < 0) {
2042 goto out;
2043 } else if (ret > 0) {
2044 ret = -ENOENT;
2045 goto out;
2046 }
2047
2048 leaf = path->nodes[0];
2049 slot = path->slots[0];
2050 btrfs_item_key_to_cpu(leaf, &key, slot);
2051
2052 item_off = btrfs_item_ptr_offset(leaf, slot);
2053 item_len = btrfs_item_size(leaf, slot);
2054 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2055 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2056 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2057 ret = -EINVAL;
2058 goto out;
2059 }
2060
2061 /* Copy subvolume's name */
2062 item_off += sizeof(struct btrfs_root_ref);
2063 item_len -= sizeof(struct btrfs_root_ref);
2064 read_extent_buffer(leaf, args->name, item_off, item_len);
2065 args->name[item_len] = 0;
2066
2067out_put:
2068 btrfs_put_root(root);
2069out:
2070 btrfs_free_path(path);
2071 return ret;
2072}
2073
2074static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root,
2075 void __user *argp)
2076{
2077 struct btrfs_ioctl_ino_lookup_args *args;
2078 int ret = 0;
2079
2080 args = memdup_user(argp, sizeof(*args));
2081 if (IS_ERR(args))
2082 return PTR_ERR(args);
2083
2084 /*
2085 * Unprivileged query to obtain the containing subvolume root id. The
2086 * path is reset so it's consistent with btrfs_search_path_in_tree.
2087 */
2088 if (args->treeid == 0)
2089 args->treeid = btrfs_root_id(root);
2090
2091 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2092 args->name[0] = 0;
2093 goto out;
2094 }
2095
2096 if (!capable(CAP_SYS_ADMIN)) {
2097 ret = -EPERM;
2098 goto out;
2099 }
2100
2101 ret = btrfs_search_path_in_tree(root->fs_info,
2102 args->treeid, args->objectid,
2103 args->name);
2104
2105out:
2106 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2107 ret = -EFAULT;
2108
2109 kfree(args);
2110 return ret;
2111}
2112
2113/*
2114 * Version of ino_lookup ioctl (unprivileged)
2115 *
2116 * The main differences from ino_lookup ioctl are:
2117 *
2118 * 1. Read + Exec permission will be checked using inode_permission() during
2119 * path construction. -EACCES will be returned in case of failure.
2120 * 2. Path construction will be stopped at the inode number which corresponds
2121 * to the fd with which this ioctl is called. If constructed path does not
2122 * exist under fd's inode, -EACCES will be returned.
2123 * 3. The name of bottom subvolume is also searched and filled.
2124 */
2125static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2126{
2127 struct btrfs_ioctl_ino_lookup_user_args *args;
2128 struct inode *inode;
2129 int ret;
2130
2131 args = memdup_user(argp, sizeof(*args));
2132 if (IS_ERR(args))
2133 return PTR_ERR(args);
2134
2135 inode = file_inode(file);
2136
2137 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2138 btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2139 /*
2140 * The subvolume does not exist under fd with which this is
2141 * called
2142 */
2143 kfree(args);
2144 return -EACCES;
2145 }
2146
2147 ret = btrfs_search_path_in_tree_user(file_mnt_idmap(file), inode, args);
2148
2149 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2150 ret = -EFAULT;
2151
2152 kfree(args);
2153 return ret;
2154}
2155
2156/* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2157static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp)
2158{
2159 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2160 struct btrfs_fs_info *fs_info;
2161 struct btrfs_root *root;
2162 struct btrfs_path *path;
2163 struct btrfs_key key;
2164 struct btrfs_root_item *root_item;
2165 struct btrfs_root_ref *rref;
2166 struct extent_buffer *leaf;
2167 unsigned long item_off;
2168 unsigned long item_len;
2169 int slot;
2170 int ret = 0;
2171
2172 path = btrfs_alloc_path();
2173 if (!path)
2174 return -ENOMEM;
2175
2176 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2177 if (!subvol_info) {
2178 btrfs_free_path(path);
2179 return -ENOMEM;
2180 }
2181
2182 fs_info = BTRFS_I(inode)->root->fs_info;
2183
2184 /* Get root_item of inode's subvolume */
2185 key.objectid = btrfs_root_id(BTRFS_I(inode)->root);
2186 root = btrfs_get_fs_root(fs_info, key.objectid, true);
2187 if (IS_ERR(root)) {
2188 ret = PTR_ERR(root);
2189 goto out_free;
2190 }
2191 root_item = &root->root_item;
2192
2193 subvol_info->treeid = key.objectid;
2194
2195 subvol_info->generation = btrfs_root_generation(root_item);
2196 subvol_info->flags = btrfs_root_flags(root_item);
2197
2198 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2199 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2200 BTRFS_UUID_SIZE);
2201 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2202 BTRFS_UUID_SIZE);
2203
2204 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2205 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2206 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2207
2208 subvol_info->otransid = btrfs_root_otransid(root_item);
2209 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2210 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2211
2212 subvol_info->stransid = btrfs_root_stransid(root_item);
2213 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2214 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2215
2216 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2217 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2218 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2219
2220 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2221 /* Search root tree for ROOT_BACKREF of this subvolume */
2222 key.type = BTRFS_ROOT_BACKREF_KEY;
2223 key.offset = 0;
2224 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2225 if (ret < 0) {
2226 goto out;
2227 } else if (path->slots[0] >=
2228 btrfs_header_nritems(path->nodes[0])) {
2229 ret = btrfs_next_leaf(fs_info->tree_root, path);
2230 if (ret < 0) {
2231 goto out;
2232 } else if (ret > 0) {
2233 ret = -EUCLEAN;
2234 goto out;
2235 }
2236 }
2237
2238 leaf = path->nodes[0];
2239 slot = path->slots[0];
2240 btrfs_item_key_to_cpu(leaf, &key, slot);
2241 if (key.objectid == subvol_info->treeid &&
2242 key.type == BTRFS_ROOT_BACKREF_KEY) {
2243 subvol_info->parent_id = key.offset;
2244
2245 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2246 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2247
2248 item_off = btrfs_item_ptr_offset(leaf, slot)
2249 + sizeof(struct btrfs_root_ref);
2250 item_len = btrfs_item_size(leaf, slot)
2251 - sizeof(struct btrfs_root_ref);
2252 read_extent_buffer(leaf, subvol_info->name,
2253 item_off, item_len);
2254 } else {
2255 ret = -ENOENT;
2256 goto out;
2257 }
2258 }
2259
2260 btrfs_free_path(path);
2261 path = NULL;
2262 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2263 ret = -EFAULT;
2264
2265out:
2266 btrfs_put_root(root);
2267out_free:
2268 btrfs_free_path(path);
2269 kfree(subvol_info);
2270 return ret;
2271}
2272
2273/*
2274 * Return ROOT_REF information of the subvolume containing this inode
2275 * except the subvolume name.
2276 */
2277static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root,
2278 void __user *argp)
2279{
2280 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2281 struct btrfs_root_ref *rref;
2282 struct btrfs_path *path;
2283 struct btrfs_key key;
2284 struct extent_buffer *leaf;
2285 u64 objectid;
2286 int slot;
2287 int ret;
2288 u8 found;
2289
2290 path = btrfs_alloc_path();
2291 if (!path)
2292 return -ENOMEM;
2293
2294 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2295 if (IS_ERR(rootrefs)) {
2296 btrfs_free_path(path);
2297 return PTR_ERR(rootrefs);
2298 }
2299
2300 objectid = btrfs_root_id(root);
2301 key.objectid = objectid;
2302 key.type = BTRFS_ROOT_REF_KEY;
2303 key.offset = rootrefs->min_treeid;
2304 found = 0;
2305
2306 root = root->fs_info->tree_root;
2307 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2308 if (ret < 0) {
2309 goto out;
2310 } else if (path->slots[0] >=
2311 btrfs_header_nritems(path->nodes[0])) {
2312 ret = btrfs_next_leaf(root, path);
2313 if (ret < 0) {
2314 goto out;
2315 } else if (ret > 0) {
2316 ret = -EUCLEAN;
2317 goto out;
2318 }
2319 }
2320 while (1) {
2321 leaf = path->nodes[0];
2322 slot = path->slots[0];
2323
2324 btrfs_item_key_to_cpu(leaf, &key, slot);
2325 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2326 ret = 0;
2327 goto out;
2328 }
2329
2330 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2331 ret = -EOVERFLOW;
2332 goto out;
2333 }
2334
2335 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2336 rootrefs->rootref[found].treeid = key.offset;
2337 rootrefs->rootref[found].dirid =
2338 btrfs_root_ref_dirid(leaf, rref);
2339 found++;
2340
2341 ret = btrfs_next_item(root, path);
2342 if (ret < 0) {
2343 goto out;
2344 } else if (ret > 0) {
2345 ret = -EUCLEAN;
2346 goto out;
2347 }
2348 }
2349
2350out:
2351 btrfs_free_path(path);
2352
2353 if (!ret || ret == -EOVERFLOW) {
2354 rootrefs->num_items = found;
2355 /* update min_treeid for next search */
2356 if (found)
2357 rootrefs->min_treeid =
2358 rootrefs->rootref[found - 1].treeid + 1;
2359 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2360 ret = -EFAULT;
2361 }
2362
2363 kfree(rootrefs);
2364
2365 return ret;
2366}
2367
2368static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2369 void __user *arg,
2370 bool destroy_v2)
2371{
2372 struct dentry *parent = file->f_path.dentry;
2373 struct dentry *dentry;
2374 struct inode *dir = d_inode(parent);
2375 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
2376 struct inode *inode;
2377 struct btrfs_root *root = BTRFS_I(dir)->root;
2378 struct btrfs_root *dest = NULL;
2379 struct btrfs_ioctl_vol_args *vol_args = NULL;
2380 struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
2381 struct mnt_idmap *idmap = file_mnt_idmap(file);
2382 char *subvol_name, *subvol_name_ptr = NULL;
2383 int subvol_namelen;
2384 int ret = 0;
2385 bool destroy_parent = false;
2386
2387 /* We don't support snapshots with extent tree v2 yet. */
2388 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2389 btrfs_err(fs_info,
2390 "extent tree v2 doesn't support snapshot deletion yet");
2391 return -EOPNOTSUPP;
2392 }
2393
2394 if (destroy_v2) {
2395 vol_args2 = memdup_user(arg, sizeof(*vol_args2));
2396 if (IS_ERR(vol_args2))
2397 return PTR_ERR(vol_args2);
2398
2399 if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
2400 ret = -EOPNOTSUPP;
2401 goto out;
2402 }
2403
2404 /*
2405 * If SPEC_BY_ID is not set, we are looking for the subvolume by
2406 * name, same as v1 currently does.
2407 */
2408 if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
2409 ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args2);
2410 if (ret < 0)
2411 goto out;
2412 subvol_name = vol_args2->name;
2413
2414 ret = mnt_want_write_file(file);
2415 if (ret)
2416 goto out;
2417 } else {
2418 struct inode *old_dir;
2419
2420 if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
2421 ret = -EINVAL;
2422 goto out;
2423 }
2424
2425 ret = mnt_want_write_file(file);
2426 if (ret)
2427 goto out;
2428
2429 dentry = btrfs_get_dentry(fs_info->sb,
2430 BTRFS_FIRST_FREE_OBJECTID,
2431 vol_args2->subvolid, 0);
2432 if (IS_ERR(dentry)) {
2433 ret = PTR_ERR(dentry);
2434 goto out_drop_write;
2435 }
2436
2437 /*
2438 * Change the default parent since the subvolume being
2439 * deleted can be outside of the current mount point.
2440 */
2441 parent = btrfs_get_parent(dentry);
2442
2443 /*
2444 * At this point dentry->d_name can point to '/' if the
2445 * subvolume we want to destroy is outsite of the
2446 * current mount point, so we need to release the
2447 * current dentry and execute the lookup to return a new
2448 * one with ->d_name pointing to the
2449 * <mount point>/subvol_name.
2450 */
2451 dput(dentry);
2452 if (IS_ERR(parent)) {
2453 ret = PTR_ERR(parent);
2454 goto out_drop_write;
2455 }
2456 old_dir = dir;
2457 dir = d_inode(parent);
2458
2459 /*
2460 * If v2 was used with SPEC_BY_ID, a new parent was
2461 * allocated since the subvolume can be outside of the
2462 * current mount point. Later on we need to release this
2463 * new parent dentry.
2464 */
2465 destroy_parent = true;
2466
2467 /*
2468 * On idmapped mounts, deletion via subvolid is
2469 * restricted to subvolumes that are immediate
2470 * ancestors of the inode referenced by the file
2471 * descriptor in the ioctl. Otherwise the idmapping
2472 * could potentially be abused to delete subvolumes
2473 * anywhere in the filesystem the user wouldn't be able
2474 * to delete without an idmapped mount.
2475 */
2476 if (old_dir != dir && idmap != &nop_mnt_idmap) {
2477 ret = -EOPNOTSUPP;
2478 goto free_parent;
2479 }
2480
2481 subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
2482 fs_info, vol_args2->subvolid);
2483 if (IS_ERR(subvol_name_ptr)) {
2484 ret = PTR_ERR(subvol_name_ptr);
2485 goto free_parent;
2486 }
2487 /* subvol_name_ptr is already nul terminated */
2488 subvol_name = (char *)kbasename(subvol_name_ptr);
2489 }
2490 } else {
2491 vol_args = memdup_user(arg, sizeof(*vol_args));
2492 if (IS_ERR(vol_args))
2493 return PTR_ERR(vol_args);
2494
2495 ret = btrfs_check_ioctl_vol_args_path(vol_args);
2496 if (ret < 0)
2497 goto out;
2498
2499 subvol_name = vol_args->name;
2500
2501 ret = mnt_want_write_file(file);
2502 if (ret)
2503 goto out;
2504 }
2505
2506 subvol_namelen = strlen(subvol_name);
2507
2508 if (strchr(subvol_name, '/') ||
2509 strncmp(subvol_name, "..", subvol_namelen) == 0) {
2510 ret = -EINVAL;
2511 goto free_subvol_name;
2512 }
2513
2514 if (!S_ISDIR(dir->i_mode)) {
2515 ret = -ENOTDIR;
2516 goto free_subvol_name;
2517 }
2518
2519 ret = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2520 if (ret == -EINTR)
2521 goto free_subvol_name;
2522 dentry = lookup_one(idmap, subvol_name, parent, subvol_namelen);
2523 if (IS_ERR(dentry)) {
2524 ret = PTR_ERR(dentry);
2525 goto out_unlock_dir;
2526 }
2527
2528 if (d_really_is_negative(dentry)) {
2529 ret = -ENOENT;
2530 goto out_dput;
2531 }
2532
2533 inode = d_inode(dentry);
2534 dest = BTRFS_I(inode)->root;
2535 if (!capable(CAP_SYS_ADMIN)) {
2536 /*
2537 * Regular user. Only allow this with a special mount
2538 * option, when the user has write+exec access to the
2539 * subvol root, and when rmdir(2) would have been
2540 * allowed.
2541 *
2542 * Note that this is _not_ check that the subvol is
2543 * empty or doesn't contain data that we wouldn't
2544 * otherwise be able to delete.
2545 *
2546 * Users who want to delete empty subvols should try
2547 * rmdir(2).
2548 */
2549 ret = -EPERM;
2550 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2551 goto out_dput;
2552
2553 /*
2554 * Do not allow deletion if the parent dir is the same
2555 * as the dir to be deleted. That means the ioctl
2556 * must be called on the dentry referencing the root
2557 * of the subvol, not a random directory contained
2558 * within it.
2559 */
2560 ret = -EINVAL;
2561 if (root == dest)
2562 goto out_dput;
2563
2564 ret = inode_permission(idmap, inode, MAY_WRITE | MAY_EXEC);
2565 if (ret)
2566 goto out_dput;
2567 }
2568
2569 /* check if subvolume may be deleted by a user */
2570 ret = btrfs_may_delete(idmap, dir, dentry, 1);
2571 if (ret)
2572 goto out_dput;
2573
2574 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2575 ret = -EINVAL;
2576 goto out_dput;
2577 }
2578
2579 btrfs_inode_lock(BTRFS_I(inode), 0);
2580 ret = btrfs_delete_subvolume(BTRFS_I(dir), dentry);
2581 btrfs_inode_unlock(BTRFS_I(inode), 0);
2582 if (!ret)
2583 d_delete_notify(dir, dentry);
2584
2585out_dput:
2586 dput(dentry);
2587out_unlock_dir:
2588 btrfs_inode_unlock(BTRFS_I(dir), 0);
2589free_subvol_name:
2590 kfree(subvol_name_ptr);
2591free_parent:
2592 if (destroy_parent)
2593 dput(parent);
2594out_drop_write:
2595 mnt_drop_write_file(file);
2596out:
2597 kfree(vol_args2);
2598 kfree(vol_args);
2599 return ret;
2600}
2601
2602static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2603{
2604 struct inode *inode = file_inode(file);
2605 struct btrfs_root *root = BTRFS_I(inode)->root;
2606 struct btrfs_ioctl_defrag_range_args range = {0};
2607 int ret;
2608
2609 ret = mnt_want_write_file(file);
2610 if (ret)
2611 return ret;
2612
2613 if (btrfs_root_readonly(root)) {
2614 ret = -EROFS;
2615 goto out;
2616 }
2617
2618 switch (inode->i_mode & S_IFMT) {
2619 case S_IFDIR:
2620 if (!capable(CAP_SYS_ADMIN)) {
2621 ret = -EPERM;
2622 goto out;
2623 }
2624 ret = btrfs_defrag_root(root);
2625 break;
2626 case S_IFREG:
2627 /*
2628 * Note that this does not check the file descriptor for write
2629 * access. This prevents defragmenting executables that are
2630 * running and allows defrag on files open in read-only mode.
2631 */
2632 if (!capable(CAP_SYS_ADMIN) &&
2633 inode_permission(&nop_mnt_idmap, inode, MAY_WRITE)) {
2634 ret = -EPERM;
2635 goto out;
2636 }
2637
2638 if (argp) {
2639 if (copy_from_user(&range, argp, sizeof(range))) {
2640 ret = -EFAULT;
2641 goto out;
2642 }
2643 if (range.flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) {
2644 ret = -EOPNOTSUPP;
2645 goto out;
2646 }
2647 /* compression requires us to start the IO */
2648 if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2649 range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
2650 range.extent_thresh = (u32)-1;
2651 }
2652 } else {
2653 /* the rest are all set to zero by kzalloc */
2654 range.len = (u64)-1;
2655 }
2656 ret = btrfs_defrag_file(file_inode(file), &file->f_ra,
2657 &range, BTRFS_OLDEST_GENERATION, 0);
2658 if (ret > 0)
2659 ret = 0;
2660 break;
2661 default:
2662 ret = -EINVAL;
2663 }
2664out:
2665 mnt_drop_write_file(file);
2666 return ret;
2667}
2668
2669static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
2670{
2671 struct btrfs_ioctl_vol_args *vol_args;
2672 bool restore_op = false;
2673 int ret;
2674
2675 if (!capable(CAP_SYS_ADMIN))
2676 return -EPERM;
2677
2678 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2679 btrfs_err(fs_info, "device add not supported on extent tree v2 yet");
2680 return -EINVAL;
2681 }
2682
2683 if (fs_info->fs_devices->temp_fsid) {
2684 btrfs_err(fs_info,
2685 "device add not supported on cloned temp-fsid mount");
2686 return -EINVAL;
2687 }
2688
2689 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) {
2690 if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD))
2691 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2692
2693 /*
2694 * We can do the device add because we have a paused balanced,
2695 * change the exclusive op type and remember we should bring
2696 * back the paused balance
2697 */
2698 fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD;
2699 btrfs_exclop_start_unlock(fs_info);
2700 restore_op = true;
2701 }
2702
2703 vol_args = memdup_user(arg, sizeof(*vol_args));
2704 if (IS_ERR(vol_args)) {
2705 ret = PTR_ERR(vol_args);
2706 goto out;
2707 }
2708
2709 ret = btrfs_check_ioctl_vol_args_path(vol_args);
2710 if (ret < 0)
2711 goto out_free;
2712
2713 ret = btrfs_init_new_device(fs_info, vol_args->name);
2714
2715 if (!ret)
2716 btrfs_info(fs_info, "disk added %s", vol_args->name);
2717
2718out_free:
2719 kfree(vol_args);
2720out:
2721 if (restore_op)
2722 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);
2723 else
2724 btrfs_exclop_finish(fs_info);
2725 return ret;
2726}
2727
2728static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
2729{
2730 BTRFS_DEV_LOOKUP_ARGS(args);
2731 struct inode *inode = file_inode(file);
2732 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
2733 struct btrfs_ioctl_vol_args_v2 *vol_args;
2734 struct file *bdev_file = NULL;
2735 int ret;
2736 bool cancel = false;
2737
2738 if (!capable(CAP_SYS_ADMIN))
2739 return -EPERM;
2740
2741 vol_args = memdup_user(arg, sizeof(*vol_args));
2742 if (IS_ERR(vol_args))
2743 return PTR_ERR(vol_args);
2744
2745 if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
2746 ret = -EOPNOTSUPP;
2747 goto out;
2748 }
2749
2750 ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args);
2751 if (ret < 0)
2752 goto out;
2753
2754 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
2755 args.devid = vol_args->devid;
2756 } else if (!strcmp("cancel", vol_args->name)) {
2757 cancel = true;
2758 } else {
2759 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2760 if (ret)
2761 goto out;
2762 }
2763
2764 ret = mnt_want_write_file(file);
2765 if (ret)
2766 goto out;
2767
2768 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2769 cancel);
2770 if (ret)
2771 goto err_drop;
2772
2773 /* Exclusive operation is now claimed */
2774 ret = btrfs_rm_device(fs_info, &args, &bdev_file);
2775
2776 btrfs_exclop_finish(fs_info);
2777
2778 if (!ret) {
2779 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
2780 btrfs_info(fs_info, "device deleted: id %llu",
2781 vol_args->devid);
2782 else
2783 btrfs_info(fs_info, "device deleted: %s",
2784 vol_args->name);
2785 }
2786err_drop:
2787 mnt_drop_write_file(file);
2788 if (bdev_file)
2789 fput(bdev_file);
2790out:
2791 btrfs_put_dev_args_from_path(&args);
2792 kfree(vol_args);
2793 return ret;
2794}
2795
2796static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2797{
2798 BTRFS_DEV_LOOKUP_ARGS(args);
2799 struct inode *inode = file_inode(file);
2800 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
2801 struct btrfs_ioctl_vol_args *vol_args;
2802 struct file *bdev_file = NULL;
2803 int ret;
2804 bool cancel = false;
2805
2806 if (!capable(CAP_SYS_ADMIN))
2807 return -EPERM;
2808
2809 vol_args = memdup_user(arg, sizeof(*vol_args));
2810 if (IS_ERR(vol_args))
2811 return PTR_ERR(vol_args);
2812
2813 ret = btrfs_check_ioctl_vol_args_path(vol_args);
2814 if (ret < 0)
2815 goto out_free;
2816
2817 if (!strcmp("cancel", vol_args->name)) {
2818 cancel = true;
2819 } else {
2820 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2821 if (ret)
2822 goto out;
2823 }
2824
2825 ret = mnt_want_write_file(file);
2826 if (ret)
2827 goto out;
2828
2829 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2830 cancel);
2831 if (ret == 0) {
2832 ret = btrfs_rm_device(fs_info, &args, &bdev_file);
2833 if (!ret)
2834 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
2835 btrfs_exclop_finish(fs_info);
2836 }
2837
2838 mnt_drop_write_file(file);
2839 if (bdev_file)
2840 fput(bdev_file);
2841out:
2842 btrfs_put_dev_args_from_path(&args);
2843out_free:
2844 kfree(vol_args);
2845 return ret;
2846}
2847
2848static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
2849 void __user *arg)
2850{
2851 struct btrfs_ioctl_fs_info_args *fi_args;
2852 struct btrfs_device *device;
2853 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2854 u64 flags_in;
2855 int ret = 0;
2856
2857 fi_args = memdup_user(arg, sizeof(*fi_args));
2858 if (IS_ERR(fi_args))
2859 return PTR_ERR(fi_args);
2860
2861 flags_in = fi_args->flags;
2862 memset(fi_args, 0, sizeof(*fi_args));
2863
2864 rcu_read_lock();
2865 fi_args->num_devices = fs_devices->num_devices;
2866
2867 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
2868 if (device->devid > fi_args->max_id)
2869 fi_args->max_id = device->devid;
2870 }
2871 rcu_read_unlock();
2872
2873 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
2874 fi_args->nodesize = fs_info->nodesize;
2875 fi_args->sectorsize = fs_info->sectorsize;
2876 fi_args->clone_alignment = fs_info->sectorsize;
2877
2878 if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
2879 fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
2880 fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
2881 fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
2882 }
2883
2884 if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
2885 fi_args->generation = btrfs_get_fs_generation(fs_info);
2886 fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
2887 }
2888
2889 if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
2890 memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
2891 sizeof(fi_args->metadata_uuid));
2892 fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
2893 }
2894
2895 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2896 ret = -EFAULT;
2897
2898 kfree(fi_args);
2899 return ret;
2900}
2901
2902static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
2903 void __user *arg)
2904{
2905 BTRFS_DEV_LOOKUP_ARGS(args);
2906 struct btrfs_ioctl_dev_info_args *di_args;
2907 struct btrfs_device *dev;
2908 int ret = 0;
2909
2910 di_args = memdup_user(arg, sizeof(*di_args));
2911 if (IS_ERR(di_args))
2912 return PTR_ERR(di_args);
2913
2914 args.devid = di_args->devid;
2915 if (!btrfs_is_empty_uuid(di_args->uuid))
2916 args.uuid = di_args->uuid;
2917
2918 rcu_read_lock();
2919 dev = btrfs_find_device(fs_info->fs_devices, &args);
2920 if (!dev) {
2921 ret = -ENODEV;
2922 goto out;
2923 }
2924
2925 di_args->devid = dev->devid;
2926 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2927 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
2928 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2929 memcpy(di_args->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
2930 if (dev->name)
2931 strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path));
2932 else
2933 di_args->path[0] = '\0';
2934
2935out:
2936 rcu_read_unlock();
2937 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2938 ret = -EFAULT;
2939
2940 kfree(di_args);
2941 return ret;
2942}
2943
2944static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2945{
2946 struct inode *inode = file_inode(file);
2947 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
2948 struct btrfs_root *root = BTRFS_I(inode)->root;
2949 struct btrfs_root *new_root;
2950 struct btrfs_dir_item *di;
2951 struct btrfs_trans_handle *trans;
2952 struct btrfs_path *path = NULL;
2953 struct btrfs_disk_key disk_key;
2954 struct fscrypt_str name = FSTR_INIT("default", 7);
2955 u64 objectid = 0;
2956 u64 dir_id;
2957 int ret;
2958
2959 if (!capable(CAP_SYS_ADMIN))
2960 return -EPERM;
2961
2962 ret = mnt_want_write_file(file);
2963 if (ret)
2964 return ret;
2965
2966 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2967 ret = -EFAULT;
2968 goto out;
2969 }
2970
2971 if (!objectid)
2972 objectid = BTRFS_FS_TREE_OBJECTID;
2973
2974 new_root = btrfs_get_fs_root(fs_info, objectid, true);
2975 if (IS_ERR(new_root)) {
2976 ret = PTR_ERR(new_root);
2977 goto out;
2978 }
2979 if (!is_fstree(btrfs_root_id(new_root))) {
2980 ret = -ENOENT;
2981 goto out_free;
2982 }
2983
2984 path = btrfs_alloc_path();
2985 if (!path) {
2986 ret = -ENOMEM;
2987 goto out_free;
2988 }
2989
2990 trans = btrfs_start_transaction(root, 1);
2991 if (IS_ERR(trans)) {
2992 ret = PTR_ERR(trans);
2993 goto out_free;
2994 }
2995
2996 dir_id = btrfs_super_root_dir(fs_info->super_copy);
2997 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
2998 dir_id, &name, 1);
2999 if (IS_ERR_OR_NULL(di)) {
3000 btrfs_release_path(path);
3001 btrfs_end_transaction(trans);
3002 btrfs_err(fs_info,
3003 "Umm, you don't have the default diritem, this isn't going to work");
3004 ret = -ENOENT;
3005 goto out_free;
3006 }
3007
3008 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3009 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3010 btrfs_mark_buffer_dirty(trans, path->nodes[0]);
3011 btrfs_release_path(path);
3012
3013 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
3014 btrfs_end_transaction(trans);
3015out_free:
3016 btrfs_put_root(new_root);
3017 btrfs_free_path(path);
3018out:
3019 mnt_drop_write_file(file);
3020 return ret;
3021}
3022
3023static void get_block_group_info(struct list_head *groups_list,
3024 struct btrfs_ioctl_space_info *space)
3025{
3026 struct btrfs_block_group *block_group;
3027
3028 space->total_bytes = 0;
3029 space->used_bytes = 0;
3030 space->flags = 0;
3031 list_for_each_entry(block_group, groups_list, list) {
3032 space->flags = block_group->flags;
3033 space->total_bytes += block_group->length;
3034 space->used_bytes += block_group->used;
3035 }
3036}
3037
3038static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
3039 void __user *arg)
3040{
3041 struct btrfs_ioctl_space_args space_args = { 0 };
3042 struct btrfs_ioctl_space_info space;
3043 struct btrfs_ioctl_space_info *dest;
3044 struct btrfs_ioctl_space_info *dest_orig;
3045 struct btrfs_ioctl_space_info __user *user_dest;
3046 struct btrfs_space_info *info;
3047 static const u64 types[] = {
3048 BTRFS_BLOCK_GROUP_DATA,
3049 BTRFS_BLOCK_GROUP_SYSTEM,
3050 BTRFS_BLOCK_GROUP_METADATA,
3051 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
3052 };
3053 int num_types = 4;
3054 int alloc_size;
3055 int ret = 0;
3056 u64 slot_count = 0;
3057 int i, c;
3058
3059 if (copy_from_user(&space_args,
3060 (struct btrfs_ioctl_space_args __user *)arg,
3061 sizeof(space_args)))
3062 return -EFAULT;
3063
3064 for (i = 0; i < num_types; i++) {
3065 struct btrfs_space_info *tmp;
3066
3067 info = NULL;
3068 list_for_each_entry(tmp, &fs_info->space_info, list) {
3069 if (tmp->flags == types[i]) {
3070 info = tmp;
3071 break;
3072 }
3073 }
3074
3075 if (!info)
3076 continue;
3077
3078 down_read(&info->groups_sem);
3079 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3080 if (!list_empty(&info->block_groups[c]))
3081 slot_count++;
3082 }
3083 up_read(&info->groups_sem);
3084 }
3085
3086 /*
3087 * Global block reserve, exported as a space_info
3088 */
3089 slot_count++;
3090
3091 /* space_slots == 0 means they are asking for a count */
3092 if (space_args.space_slots == 0) {
3093 space_args.total_spaces = slot_count;
3094 goto out;
3095 }
3096
3097 slot_count = min_t(u64, space_args.space_slots, slot_count);
3098
3099 alloc_size = sizeof(*dest) * slot_count;
3100
3101 /* we generally have at most 6 or so space infos, one for each raid
3102 * level. So, a whole page should be more than enough for everyone
3103 */
3104 if (alloc_size > PAGE_SIZE)
3105 return -ENOMEM;
3106
3107 space_args.total_spaces = 0;
3108 dest = kmalloc(alloc_size, GFP_KERNEL);
3109 if (!dest)
3110 return -ENOMEM;
3111 dest_orig = dest;
3112
3113 /* now we have a buffer to copy into */
3114 for (i = 0; i < num_types; i++) {
3115 struct btrfs_space_info *tmp;
3116
3117 if (!slot_count)
3118 break;
3119
3120 info = NULL;
3121 list_for_each_entry(tmp, &fs_info->space_info, list) {
3122 if (tmp->flags == types[i]) {
3123 info = tmp;
3124 break;
3125 }
3126 }
3127
3128 if (!info)
3129 continue;
3130 down_read(&info->groups_sem);
3131 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3132 if (!list_empty(&info->block_groups[c])) {
3133 get_block_group_info(&info->block_groups[c],
3134 &space);
3135 memcpy(dest, &space, sizeof(space));
3136 dest++;
3137 space_args.total_spaces++;
3138 slot_count--;
3139 }
3140 if (!slot_count)
3141 break;
3142 }
3143 up_read(&info->groups_sem);
3144 }
3145
3146 /*
3147 * Add global block reserve
3148 */
3149 if (slot_count) {
3150 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
3151
3152 spin_lock(&block_rsv->lock);
3153 space.total_bytes = block_rsv->size;
3154 space.used_bytes = block_rsv->size - block_rsv->reserved;
3155 spin_unlock(&block_rsv->lock);
3156 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3157 memcpy(dest, &space, sizeof(space));
3158 space_args.total_spaces++;
3159 }
3160
3161 user_dest = (struct btrfs_ioctl_space_info __user *)
3162 (arg + sizeof(struct btrfs_ioctl_space_args));
3163
3164 if (copy_to_user(user_dest, dest_orig, alloc_size))
3165 ret = -EFAULT;
3166
3167 kfree(dest_orig);
3168out:
3169 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3170 ret = -EFAULT;
3171
3172 return ret;
3173}
3174
3175static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3176 void __user *argp)
3177{
3178 struct btrfs_trans_handle *trans;
3179 u64 transid;
3180
3181 /*
3182 * Start orphan cleanup here for the given root in case it hasn't been
3183 * started already by other means. Errors are handled in the other
3184 * functions during transaction commit.
3185 */
3186 btrfs_orphan_cleanup(root);
3187
3188 trans = btrfs_attach_transaction_barrier(root);
3189 if (IS_ERR(trans)) {
3190 if (PTR_ERR(trans) != -ENOENT)
3191 return PTR_ERR(trans);
3192
3193 /* No running transaction, don't bother */
3194 transid = btrfs_get_last_trans_committed(root->fs_info);
3195 goto out;
3196 }
3197 transid = trans->transid;
3198 btrfs_commit_transaction_async(trans);
3199out:
3200 if (argp)
3201 if (copy_to_user(argp, &transid, sizeof(transid)))
3202 return -EFAULT;
3203 return 0;
3204}
3205
3206static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
3207 void __user *argp)
3208{
3209 /* By default wait for the current transaction. */
3210 u64 transid = 0;
3211
3212 if (argp)
3213 if (copy_from_user(&transid, argp, sizeof(transid)))
3214 return -EFAULT;
3215
3216 return btrfs_wait_for_commit(fs_info, transid);
3217}
3218
3219static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3220{
3221 struct btrfs_fs_info *fs_info = inode_to_fs_info(file_inode(file));
3222 struct btrfs_ioctl_scrub_args *sa;
3223 int ret;
3224
3225 if (!capable(CAP_SYS_ADMIN))
3226 return -EPERM;
3227
3228 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3229 btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet");
3230 return -EINVAL;
3231 }
3232
3233 sa = memdup_user(arg, sizeof(*sa));
3234 if (IS_ERR(sa))
3235 return PTR_ERR(sa);
3236
3237 if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) {
3238 ret = -EOPNOTSUPP;
3239 goto out;
3240 }
3241
3242 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3243 ret = mnt_want_write_file(file);
3244 if (ret)
3245 goto out;
3246 }
3247
3248 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
3249 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3250 0);
3251
3252 /*
3253 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
3254 * error. This is important as it allows user space to know how much
3255 * progress scrub has done. For example, if scrub is canceled we get
3256 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
3257 * space. Later user space can inspect the progress from the structure
3258 * btrfs_ioctl_scrub_args and resume scrub from where it left off
3259 * previously (btrfs-progs does this).
3260 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
3261 * then return -EFAULT to signal the structure was not copied or it may
3262 * be corrupt and unreliable due to a partial copy.
3263 */
3264 if (copy_to_user(arg, sa, sizeof(*sa)))
3265 ret = -EFAULT;
3266
3267 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3268 mnt_drop_write_file(file);
3269out:
3270 kfree(sa);
3271 return ret;
3272}
3273
3274static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
3275{
3276 if (!capable(CAP_SYS_ADMIN))
3277 return -EPERM;
3278
3279 return btrfs_scrub_cancel(fs_info);
3280}
3281
3282static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
3283 void __user *arg)
3284{
3285 struct btrfs_ioctl_scrub_args *sa;
3286 int ret;
3287
3288 if (!capable(CAP_SYS_ADMIN))
3289 return -EPERM;
3290
3291 sa = memdup_user(arg, sizeof(*sa));
3292 if (IS_ERR(sa))
3293 return PTR_ERR(sa);
3294
3295 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
3296
3297 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3298 ret = -EFAULT;
3299
3300 kfree(sa);
3301 return ret;
3302}
3303
3304static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
3305 void __user *arg)
3306{
3307 struct btrfs_ioctl_get_dev_stats *sa;
3308 int ret;
3309
3310 sa = memdup_user(arg, sizeof(*sa));
3311 if (IS_ERR(sa))
3312 return PTR_ERR(sa);
3313
3314 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3315 kfree(sa);
3316 return -EPERM;
3317 }
3318
3319 ret = btrfs_get_dev_stats(fs_info, sa);
3320
3321 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3322 ret = -EFAULT;
3323
3324 kfree(sa);
3325 return ret;
3326}
3327
3328static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
3329 void __user *arg)
3330{
3331 struct btrfs_ioctl_dev_replace_args *p;
3332 int ret;
3333
3334 if (!capable(CAP_SYS_ADMIN))
3335 return -EPERM;
3336
3337 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3338 btrfs_err(fs_info, "device replace not supported on extent tree v2 yet");
3339 return -EINVAL;
3340 }
3341
3342 p = memdup_user(arg, sizeof(*p));
3343 if (IS_ERR(p))
3344 return PTR_ERR(p);
3345
3346 switch (p->cmd) {
3347 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3348 if (sb_rdonly(fs_info->sb)) {
3349 ret = -EROFS;
3350 goto out;
3351 }
3352 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
3353 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3354 } else {
3355 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
3356 btrfs_exclop_finish(fs_info);
3357 }
3358 break;
3359 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3360 btrfs_dev_replace_status(fs_info, p);
3361 ret = 0;
3362 break;
3363 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3364 p->result = btrfs_dev_replace_cancel(fs_info);
3365 ret = 0;
3366 break;
3367 default:
3368 ret = -EINVAL;
3369 break;
3370 }
3371
3372 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3373 ret = -EFAULT;
3374out:
3375 kfree(p);
3376 return ret;
3377}
3378
3379static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3380{
3381 int ret = 0;
3382 int i;
3383 u64 rel_ptr;
3384 int size;
3385 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3386 struct inode_fs_paths *ipath = NULL;
3387 struct btrfs_path *path;
3388
3389 if (!capable(CAP_DAC_READ_SEARCH))
3390 return -EPERM;
3391
3392 path = btrfs_alloc_path();
3393 if (!path) {
3394 ret = -ENOMEM;
3395 goto out;
3396 }
3397
3398 ipa = memdup_user(arg, sizeof(*ipa));
3399 if (IS_ERR(ipa)) {
3400 ret = PTR_ERR(ipa);
3401 ipa = NULL;
3402 goto out;
3403 }
3404
3405 size = min_t(u32, ipa->size, 4096);
3406 ipath = init_ipath(size, root, path);
3407 if (IS_ERR(ipath)) {
3408 ret = PTR_ERR(ipath);
3409 ipath = NULL;
3410 goto out;
3411 }
3412
3413 ret = paths_from_inode(ipa->inum, ipath);
3414 if (ret < 0)
3415 goto out;
3416
3417 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3418 rel_ptr = ipath->fspath->val[i] -
3419 (u64)(unsigned long)ipath->fspath->val;
3420 ipath->fspath->val[i] = rel_ptr;
3421 }
3422
3423 btrfs_free_path(path);
3424 path = NULL;
3425 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
3426 ipath->fspath, size);
3427 if (ret) {
3428 ret = -EFAULT;
3429 goto out;
3430 }
3431
3432out:
3433 btrfs_free_path(path);
3434 free_ipath(ipath);
3435 kfree(ipa);
3436
3437 return ret;
3438}
3439
3440static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
3441 void __user *arg, int version)
3442{
3443 int ret = 0;
3444 int size;
3445 struct btrfs_ioctl_logical_ino_args *loi;
3446 struct btrfs_data_container *inodes = NULL;
3447 struct btrfs_path *path = NULL;
3448 bool ignore_offset;
3449
3450 if (!capable(CAP_SYS_ADMIN))
3451 return -EPERM;
3452
3453 loi = memdup_user(arg, sizeof(*loi));
3454 if (IS_ERR(loi))
3455 return PTR_ERR(loi);
3456
3457 if (version == 1) {
3458 ignore_offset = false;
3459 size = min_t(u32, loi->size, SZ_64K);
3460 } else {
3461 /* All reserved bits must be 0 for now */
3462 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
3463 ret = -EINVAL;
3464 goto out_loi;
3465 }
3466 /* Only accept flags we have defined so far */
3467 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
3468 ret = -EINVAL;
3469 goto out_loi;
3470 }
3471 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
3472 size = min_t(u32, loi->size, SZ_16M);
3473 }
3474
3475 inodes = init_data_container(size);
3476 if (IS_ERR(inodes)) {
3477 ret = PTR_ERR(inodes);
3478 goto out_loi;
3479 }
3480
3481 path = btrfs_alloc_path();
3482 if (!path) {
3483 ret = -ENOMEM;
3484 goto out;
3485 }
3486 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
3487 inodes, ignore_offset);
3488 btrfs_free_path(path);
3489 if (ret == -EINVAL)
3490 ret = -ENOENT;
3491 if (ret < 0)
3492 goto out;
3493
3494 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
3495 size);
3496 if (ret)
3497 ret = -EFAULT;
3498
3499out:
3500 kvfree(inodes);
3501out_loi:
3502 kfree(loi);
3503
3504 return ret;
3505}
3506
3507void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3508 struct btrfs_ioctl_balance_args *bargs)
3509{
3510 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3511
3512 bargs->flags = bctl->flags;
3513
3514 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
3515 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3516 if (atomic_read(&fs_info->balance_pause_req))
3517 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3518 if (atomic_read(&fs_info->balance_cancel_req))
3519 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3520
3521 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3522 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3523 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3524
3525 spin_lock(&fs_info->balance_lock);
3526 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3527 spin_unlock(&fs_info->balance_lock);
3528}
3529
3530/*
3531 * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as
3532 * required.
3533 *
3534 * @fs_info: the filesystem
3535 * @excl_acquired: ptr to boolean value which is set to false in case balance
3536 * is being resumed
3537 *
3538 * Return 0 on success in which case both fs_info::balance is acquired as well
3539 * as exclusive ops are blocked. In case of failure return an error code.
3540 */
3541static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired)
3542{
3543 int ret;
3544
3545 /*
3546 * Exclusive operation is locked. Three possibilities:
3547 * (1) some other op is running
3548 * (2) balance is running
3549 * (3) balance is paused -- special case (think resume)
3550 */
3551 while (1) {
3552 if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
3553 *excl_acquired = true;
3554 mutex_lock(&fs_info->balance_mutex);
3555 return 0;
3556 }
3557
3558 mutex_lock(&fs_info->balance_mutex);
3559 if (fs_info->balance_ctl) {
3560 /* This is either (2) or (3) */
3561 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3562 /* This is (2) */
3563 ret = -EINPROGRESS;
3564 goto out_failure;
3565
3566 } else {
3567 mutex_unlock(&fs_info->balance_mutex);
3568 /*
3569 * Lock released to allow other waiters to
3570 * continue, we'll reexamine the status again.
3571 */
3572 mutex_lock(&fs_info->balance_mutex);
3573
3574 if (fs_info->balance_ctl &&
3575 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3576 /* This is (3) */
3577 *excl_acquired = false;
3578 return 0;
3579 }
3580 }
3581 } else {
3582 /* This is (1) */
3583 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3584 goto out_failure;
3585 }
3586
3587 mutex_unlock(&fs_info->balance_mutex);
3588 }
3589
3590out_failure:
3591 mutex_unlock(&fs_info->balance_mutex);
3592 *excl_acquired = false;
3593 return ret;
3594}
3595
3596static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3597{
3598 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3599 struct btrfs_fs_info *fs_info = root->fs_info;
3600 struct btrfs_ioctl_balance_args *bargs;
3601 struct btrfs_balance_control *bctl;
3602 bool need_unlock = true;
3603 int ret;
3604
3605 if (!capable(CAP_SYS_ADMIN))
3606 return -EPERM;
3607
3608 ret = mnt_want_write_file(file);
3609 if (ret)
3610 return ret;
3611
3612 bargs = memdup_user(arg, sizeof(*bargs));
3613 if (IS_ERR(bargs)) {
3614 ret = PTR_ERR(bargs);
3615 bargs = NULL;
3616 goto out;
3617 }
3618
3619 ret = btrfs_try_lock_balance(fs_info, &need_unlock);
3620 if (ret)
3621 goto out;
3622
3623 lockdep_assert_held(&fs_info->balance_mutex);
3624
3625 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3626 if (!fs_info->balance_ctl) {
3627 ret = -ENOTCONN;
3628 goto out_unlock;
3629 }
3630
3631 bctl = fs_info->balance_ctl;
3632 spin_lock(&fs_info->balance_lock);
3633 bctl->flags |= BTRFS_BALANCE_RESUME;
3634 spin_unlock(&fs_info->balance_lock);
3635 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE);
3636
3637 goto do_balance;
3638 }
3639
3640 if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
3641 ret = -EINVAL;
3642 goto out_unlock;
3643 }
3644
3645 if (fs_info->balance_ctl) {
3646 ret = -EINPROGRESS;
3647 goto out_unlock;
3648 }
3649
3650 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
3651 if (!bctl) {
3652 ret = -ENOMEM;
3653 goto out_unlock;
3654 }
3655
3656 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3657 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3658 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3659
3660 bctl->flags = bargs->flags;
3661do_balance:
3662 /*
3663 * Ownership of bctl and exclusive operation goes to btrfs_balance.
3664 * bctl is freed in reset_balance_state, or, if restriper was paused
3665 * all the way until unmount, in free_fs_info. The flag should be
3666 * cleared after reset_balance_state.
3667 */
3668 need_unlock = false;
3669
3670 ret = btrfs_balance(fs_info, bctl, bargs);
3671 bctl = NULL;
3672
3673 if (ret == 0 || ret == -ECANCELED) {
3674 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3675 ret = -EFAULT;
3676 }
3677
3678 kfree(bctl);
3679out_unlock:
3680 mutex_unlock(&fs_info->balance_mutex);
3681 if (need_unlock)
3682 btrfs_exclop_finish(fs_info);
3683out:
3684 mnt_drop_write_file(file);
3685 kfree(bargs);
3686 return ret;
3687}
3688
3689static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
3690{
3691 if (!capable(CAP_SYS_ADMIN))
3692 return -EPERM;
3693
3694 switch (cmd) {
3695 case BTRFS_BALANCE_CTL_PAUSE:
3696 return btrfs_pause_balance(fs_info);
3697 case BTRFS_BALANCE_CTL_CANCEL:
3698 return btrfs_cancel_balance(fs_info);
3699 }
3700
3701 return -EINVAL;
3702}
3703
3704static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
3705 void __user *arg)
3706{
3707 struct btrfs_ioctl_balance_args *bargs;
3708 int ret = 0;
3709
3710 if (!capable(CAP_SYS_ADMIN))
3711 return -EPERM;
3712
3713 mutex_lock(&fs_info->balance_mutex);
3714 if (!fs_info->balance_ctl) {
3715 ret = -ENOTCONN;
3716 goto out;
3717 }
3718
3719 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
3720 if (!bargs) {
3721 ret = -ENOMEM;
3722 goto out;
3723 }
3724
3725 btrfs_update_ioctl_balance_args(fs_info, bargs);
3726
3727 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3728 ret = -EFAULT;
3729
3730 kfree(bargs);
3731out:
3732 mutex_unlock(&fs_info->balance_mutex);
3733 return ret;
3734}
3735
3736static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
3737{
3738 struct inode *inode = file_inode(file);
3739 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
3740 struct btrfs_ioctl_quota_ctl_args *sa;
3741 int ret;
3742
3743 if (!capable(CAP_SYS_ADMIN))
3744 return -EPERM;
3745
3746 ret = mnt_want_write_file(file);
3747 if (ret)
3748 return ret;
3749
3750 sa = memdup_user(arg, sizeof(*sa));
3751 if (IS_ERR(sa)) {
3752 ret = PTR_ERR(sa);
3753 goto drop_write;
3754 }
3755
3756 switch (sa->cmd) {
3757 case BTRFS_QUOTA_CTL_ENABLE:
3758 case BTRFS_QUOTA_CTL_ENABLE_SIMPLE_QUOTA:
3759 down_write(&fs_info->subvol_sem);
3760 ret = btrfs_quota_enable(fs_info, sa);
3761 up_write(&fs_info->subvol_sem);
3762 break;
3763 case BTRFS_QUOTA_CTL_DISABLE:
3764 /*
3765 * Lock the cleaner mutex to prevent races with concurrent
3766 * relocation, because relocation may be building backrefs for
3767 * blocks of the quota root while we are deleting the root. This
3768 * is like dropping fs roots of deleted snapshots/subvolumes, we
3769 * need the same protection.
3770 *
3771 * This also prevents races between concurrent tasks trying to
3772 * disable quotas, because we will unlock and relock
3773 * qgroup_ioctl_lock across BTRFS_FS_QUOTA_ENABLED changes.
3774 *
3775 * We take this here because we have the dependency of
3776 *
3777 * inode_lock -> subvol_sem
3778 *
3779 * because of rename. With relocation we can prealloc extents,
3780 * so that makes the dependency chain
3781 *
3782 * cleaner_mutex -> inode_lock -> subvol_sem
3783 *
3784 * so we must take the cleaner_mutex here before we take the
3785 * subvol_sem. The deadlock can't actually happen, but this
3786 * quiets lockdep.
3787 */
3788 mutex_lock(&fs_info->cleaner_mutex);
3789 down_write(&fs_info->subvol_sem);
3790 ret = btrfs_quota_disable(fs_info);
3791 up_write(&fs_info->subvol_sem);
3792 mutex_unlock(&fs_info->cleaner_mutex);
3793 break;
3794 default:
3795 ret = -EINVAL;
3796 break;
3797 }
3798
3799 kfree(sa);
3800drop_write:
3801 mnt_drop_write_file(file);
3802 return ret;
3803}
3804
3805/*
3806 * Quick check for ioctl handlers if quotas are enabled. Proper locking must be
3807 * done before any operations.
3808 */
3809static bool qgroup_enabled(struct btrfs_fs_info *fs_info)
3810{
3811 bool ret = true;
3812
3813 mutex_lock(&fs_info->qgroup_ioctl_lock);
3814 if (!fs_info->quota_root)
3815 ret = false;
3816 mutex_unlock(&fs_info->qgroup_ioctl_lock);
3817
3818 return ret;
3819}
3820
3821static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
3822{
3823 struct inode *inode = file_inode(file);
3824 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
3825 struct btrfs_root *root = BTRFS_I(inode)->root;
3826 struct btrfs_ioctl_qgroup_assign_args *sa;
3827 struct btrfs_qgroup_list *prealloc = NULL;
3828 struct btrfs_trans_handle *trans;
3829 int ret;
3830 int err;
3831
3832 if (!capable(CAP_SYS_ADMIN))
3833 return -EPERM;
3834
3835 if (!qgroup_enabled(root->fs_info))
3836 return -ENOTCONN;
3837
3838 ret = mnt_want_write_file(file);
3839 if (ret)
3840 return ret;
3841
3842 sa = memdup_user(arg, sizeof(*sa));
3843 if (IS_ERR(sa)) {
3844 ret = PTR_ERR(sa);
3845 goto drop_write;
3846 }
3847
3848 if (sa->assign) {
3849 prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
3850 if (!prealloc) {
3851 ret = -ENOMEM;
3852 goto drop_write;
3853 }
3854 }
3855
3856 trans = btrfs_join_transaction(root);
3857 if (IS_ERR(trans)) {
3858 ret = PTR_ERR(trans);
3859 goto out;
3860 }
3861
3862 /*
3863 * Prealloc ownership is moved to the relation handler, there it's used
3864 * or freed on error.
3865 */
3866 if (sa->assign) {
3867 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst, prealloc);
3868 prealloc = NULL;
3869 } else {
3870 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
3871 }
3872
3873 /* update qgroup status and info */
3874 mutex_lock(&fs_info->qgroup_ioctl_lock);
3875 err = btrfs_run_qgroups(trans);
3876 mutex_unlock(&fs_info->qgroup_ioctl_lock);
3877 if (err < 0)
3878 btrfs_warn(fs_info,
3879 "qgroup status update failed after %s relation, marked as inconsistent",
3880 sa->assign ? "adding" : "deleting");
3881 err = btrfs_end_transaction(trans);
3882 if (err && !ret)
3883 ret = err;
3884
3885out:
3886 kfree(prealloc);
3887 kfree(sa);
3888drop_write:
3889 mnt_drop_write_file(file);
3890 return ret;
3891}
3892
3893static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
3894{
3895 struct inode *inode = file_inode(file);
3896 struct btrfs_root *root = BTRFS_I(inode)->root;
3897 struct btrfs_ioctl_qgroup_create_args *sa;
3898 struct btrfs_trans_handle *trans;
3899 int ret;
3900 int err;
3901
3902 if (!capable(CAP_SYS_ADMIN))
3903 return -EPERM;
3904
3905 if (!qgroup_enabled(root->fs_info))
3906 return -ENOTCONN;
3907
3908 ret = mnt_want_write_file(file);
3909 if (ret)
3910 return ret;
3911
3912 sa = memdup_user(arg, sizeof(*sa));
3913 if (IS_ERR(sa)) {
3914 ret = PTR_ERR(sa);
3915 goto drop_write;
3916 }
3917
3918 if (!sa->qgroupid) {
3919 ret = -EINVAL;
3920 goto out;
3921 }
3922
3923 if (sa->create && is_fstree(sa->qgroupid)) {
3924 ret = -EINVAL;
3925 goto out;
3926 }
3927
3928 trans = btrfs_join_transaction(root);
3929 if (IS_ERR(trans)) {
3930 ret = PTR_ERR(trans);
3931 goto out;
3932 }
3933
3934 if (sa->create) {
3935 ret = btrfs_create_qgroup(trans, sa->qgroupid);
3936 } else {
3937 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
3938 }
3939
3940 err = btrfs_end_transaction(trans);
3941 if (err && !ret)
3942 ret = err;
3943
3944out:
3945 kfree(sa);
3946drop_write:
3947 mnt_drop_write_file(file);
3948 return ret;
3949}
3950
3951static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
3952{
3953 struct inode *inode = file_inode(file);
3954 struct btrfs_root *root = BTRFS_I(inode)->root;
3955 struct btrfs_ioctl_qgroup_limit_args *sa;
3956 struct btrfs_trans_handle *trans;
3957 int ret;
3958 int err;
3959 u64 qgroupid;
3960
3961 if (!capable(CAP_SYS_ADMIN))
3962 return -EPERM;
3963
3964 if (!qgroup_enabled(root->fs_info))
3965 return -ENOTCONN;
3966
3967 ret = mnt_want_write_file(file);
3968 if (ret)
3969 return ret;
3970
3971 sa = memdup_user(arg, sizeof(*sa));
3972 if (IS_ERR(sa)) {
3973 ret = PTR_ERR(sa);
3974 goto drop_write;
3975 }
3976
3977 trans = btrfs_join_transaction(root);
3978 if (IS_ERR(trans)) {
3979 ret = PTR_ERR(trans);
3980 goto out;
3981 }
3982
3983 qgroupid = sa->qgroupid;
3984 if (!qgroupid) {
3985 /* take the current subvol as qgroup */
3986 qgroupid = btrfs_root_id(root);
3987 }
3988
3989 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
3990
3991 err = btrfs_end_transaction(trans);
3992 if (err && !ret)
3993 ret = err;
3994
3995out:
3996 kfree(sa);
3997drop_write:
3998 mnt_drop_write_file(file);
3999 return ret;
4000}
4001
4002static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4003{
4004 struct inode *inode = file_inode(file);
4005 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4006 struct btrfs_ioctl_quota_rescan_args *qsa;
4007 int ret;
4008
4009 if (!capable(CAP_SYS_ADMIN))
4010 return -EPERM;
4011
4012 if (!qgroup_enabled(fs_info))
4013 return -ENOTCONN;
4014
4015 ret = mnt_want_write_file(file);
4016 if (ret)
4017 return ret;
4018
4019 qsa = memdup_user(arg, sizeof(*qsa));
4020 if (IS_ERR(qsa)) {
4021 ret = PTR_ERR(qsa);
4022 goto drop_write;
4023 }
4024
4025 if (qsa->flags) {
4026 ret = -EINVAL;
4027 goto out;
4028 }
4029
4030 ret = btrfs_qgroup_rescan(fs_info);
4031
4032out:
4033 kfree(qsa);
4034drop_write:
4035 mnt_drop_write_file(file);
4036 return ret;
4037}
4038
4039static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
4040 void __user *arg)
4041{
4042 struct btrfs_ioctl_quota_rescan_args qsa = {0};
4043
4044 if (!capable(CAP_SYS_ADMIN))
4045 return -EPERM;
4046
4047 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4048 qsa.flags = 1;
4049 qsa.progress = fs_info->qgroup_rescan_progress.objectid;
4050 }
4051
4052 if (copy_to_user(arg, &qsa, sizeof(qsa)))
4053 return -EFAULT;
4054
4055 return 0;
4056}
4057
4058static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info)
4059{
4060 if (!capable(CAP_SYS_ADMIN))
4061 return -EPERM;
4062
4063 return btrfs_qgroup_wait_for_completion(fs_info, true);
4064}
4065
4066static long _btrfs_ioctl_set_received_subvol(struct file *file,
4067 struct mnt_idmap *idmap,
4068 struct btrfs_ioctl_received_subvol_args *sa)
4069{
4070 struct inode *inode = file_inode(file);
4071 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4072 struct btrfs_root *root = BTRFS_I(inode)->root;
4073 struct btrfs_root_item *root_item = &root->root_item;
4074 struct btrfs_trans_handle *trans;
4075 struct timespec64 ct = current_time(inode);
4076 int ret = 0;
4077 int received_uuid_changed;
4078
4079 if (!inode_owner_or_capable(idmap, inode))
4080 return -EPERM;
4081
4082 ret = mnt_want_write_file(file);
4083 if (ret < 0)
4084 return ret;
4085
4086 down_write(&fs_info->subvol_sem);
4087
4088 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
4089 ret = -EINVAL;
4090 goto out;
4091 }
4092
4093 if (btrfs_root_readonly(root)) {
4094 ret = -EROFS;
4095 goto out;
4096 }
4097
4098 /*
4099 * 1 - root item
4100 * 2 - uuid items (received uuid + subvol uuid)
4101 */
4102 trans = btrfs_start_transaction(root, 3);
4103 if (IS_ERR(trans)) {
4104 ret = PTR_ERR(trans);
4105 trans = NULL;
4106 goto out;
4107 }
4108
4109 sa->rtransid = trans->transid;
4110 sa->rtime.sec = ct.tv_sec;
4111 sa->rtime.nsec = ct.tv_nsec;
4112
4113 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4114 BTRFS_UUID_SIZE);
4115 if (received_uuid_changed &&
4116 !btrfs_is_empty_uuid(root_item->received_uuid)) {
4117 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
4118 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4119 btrfs_root_id(root));
4120 if (ret && ret != -ENOENT) {
4121 btrfs_abort_transaction(trans, ret);
4122 btrfs_end_transaction(trans);
4123 goto out;
4124 }
4125 }
4126 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4127 btrfs_set_root_stransid(root_item, sa->stransid);
4128 btrfs_set_root_rtransid(root_item, sa->rtransid);
4129 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4130 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4131 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4132 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4133
4134 ret = btrfs_update_root(trans, fs_info->tree_root,
4135 &root->root_key, &root->root_item);
4136 if (ret < 0) {
4137 btrfs_end_transaction(trans);
4138 goto out;
4139 }
4140 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4141 ret = btrfs_uuid_tree_add(trans, sa->uuid,
4142 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4143 btrfs_root_id(root));
4144 if (ret < 0 && ret != -EEXIST) {
4145 btrfs_abort_transaction(trans, ret);
4146 btrfs_end_transaction(trans);
4147 goto out;
4148 }
4149 }
4150 ret = btrfs_commit_transaction(trans);
4151out:
4152 up_write(&fs_info->subvol_sem);
4153 mnt_drop_write_file(file);
4154 return ret;
4155}
4156
4157#ifdef CONFIG_64BIT
4158static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4159 void __user *arg)
4160{
4161 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4162 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4163 int ret = 0;
4164
4165 args32 = memdup_user(arg, sizeof(*args32));
4166 if (IS_ERR(args32))
4167 return PTR_ERR(args32);
4168
4169 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
4170 if (!args64) {
4171 ret = -ENOMEM;
4172 goto out;
4173 }
4174
4175 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4176 args64->stransid = args32->stransid;
4177 args64->rtransid = args32->rtransid;
4178 args64->stime.sec = args32->stime.sec;
4179 args64->stime.nsec = args32->stime.nsec;
4180 args64->rtime.sec = args32->rtime.sec;
4181 args64->rtime.nsec = args32->rtime.nsec;
4182 args64->flags = args32->flags;
4183
4184 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), args64);
4185 if (ret)
4186 goto out;
4187
4188 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4189 args32->stransid = args64->stransid;
4190 args32->rtransid = args64->rtransid;
4191 args32->stime.sec = args64->stime.sec;
4192 args32->stime.nsec = args64->stime.nsec;
4193 args32->rtime.sec = args64->rtime.sec;
4194 args32->rtime.nsec = args64->rtime.nsec;
4195 args32->flags = args64->flags;
4196
4197 ret = copy_to_user(arg, args32, sizeof(*args32));
4198 if (ret)
4199 ret = -EFAULT;
4200
4201out:
4202 kfree(args32);
4203 kfree(args64);
4204 return ret;
4205}
4206#endif
4207
4208static long btrfs_ioctl_set_received_subvol(struct file *file,
4209 void __user *arg)
4210{
4211 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4212 int ret = 0;
4213
4214 sa = memdup_user(arg, sizeof(*sa));
4215 if (IS_ERR(sa))
4216 return PTR_ERR(sa);
4217
4218 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), sa);
4219
4220 if (ret)
4221 goto out;
4222
4223 ret = copy_to_user(arg, sa, sizeof(*sa));
4224 if (ret)
4225 ret = -EFAULT;
4226
4227out:
4228 kfree(sa);
4229 return ret;
4230}
4231
4232static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
4233 void __user *arg)
4234{
4235 size_t len;
4236 int ret;
4237 char label[BTRFS_LABEL_SIZE];
4238
4239 spin_lock(&fs_info->super_lock);
4240 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4241 spin_unlock(&fs_info->super_lock);
4242
4243 len = strnlen(label, BTRFS_LABEL_SIZE);
4244
4245 if (len == BTRFS_LABEL_SIZE) {
4246 btrfs_warn(fs_info,
4247 "label is too long, return the first %zu bytes",
4248 --len);
4249 }
4250
4251 ret = copy_to_user(arg, label, len);
4252
4253 return ret ? -EFAULT : 0;
4254}
4255
4256static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4257{
4258 struct inode *inode = file_inode(file);
4259 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4260 struct btrfs_root *root = BTRFS_I(inode)->root;
4261 struct btrfs_super_block *super_block = fs_info->super_copy;
4262 struct btrfs_trans_handle *trans;
4263 char label[BTRFS_LABEL_SIZE];
4264 int ret;
4265
4266 if (!capable(CAP_SYS_ADMIN))
4267 return -EPERM;
4268
4269 if (copy_from_user(label, arg, sizeof(label)))
4270 return -EFAULT;
4271
4272 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4273 btrfs_err(fs_info,
4274 "unable to set label with more than %d bytes",
4275 BTRFS_LABEL_SIZE - 1);
4276 return -EINVAL;
4277 }
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_unlock;
4287 }
4288
4289 spin_lock(&fs_info->super_lock);
4290 strcpy(super_block->label, label);
4291 spin_unlock(&fs_info->super_lock);
4292 ret = btrfs_commit_transaction(trans);
4293
4294out_unlock:
4295 mnt_drop_write_file(file);
4296 return ret;
4297}
4298
4299#define INIT_FEATURE_FLAGS(suffix) \
4300 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4301 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4302 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4303
4304int btrfs_ioctl_get_supported_features(void __user *arg)
4305{
4306 static const struct btrfs_ioctl_feature_flags features[3] = {
4307 INIT_FEATURE_FLAGS(SUPP),
4308 INIT_FEATURE_FLAGS(SAFE_SET),
4309 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4310 };
4311
4312 if (copy_to_user(arg, &features, sizeof(features)))
4313 return -EFAULT;
4314
4315 return 0;
4316}
4317
4318static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
4319 void __user *arg)
4320{
4321 struct btrfs_super_block *super_block = fs_info->super_copy;
4322 struct btrfs_ioctl_feature_flags features;
4323
4324 features.compat_flags = btrfs_super_compat_flags(super_block);
4325 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4326 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4327
4328 if (copy_to_user(arg, &features, sizeof(features)))
4329 return -EFAULT;
4330
4331 return 0;
4332}
4333
4334static int check_feature_bits(struct btrfs_fs_info *fs_info,
4335 enum btrfs_feature_set set,
4336 u64 change_mask, u64 flags, u64 supported_flags,
4337 u64 safe_set, u64 safe_clear)
4338{
4339 const char *type = btrfs_feature_set_name(set);
4340 char *names;
4341 u64 disallowed, unsupported;
4342 u64 set_mask = flags & change_mask;
4343 u64 clear_mask = ~flags & change_mask;
4344
4345 unsupported = set_mask & ~supported_flags;
4346 if (unsupported) {
4347 names = btrfs_printable_features(set, unsupported);
4348 if (names) {
4349 btrfs_warn(fs_info,
4350 "this kernel does not support the %s feature bit%s",
4351 names, strchr(names, ',') ? "s" : "");
4352 kfree(names);
4353 } else
4354 btrfs_warn(fs_info,
4355 "this kernel does not support %s bits 0x%llx",
4356 type, unsupported);
4357 return -EOPNOTSUPP;
4358 }
4359
4360 disallowed = set_mask & ~safe_set;
4361 if (disallowed) {
4362 names = btrfs_printable_features(set, disallowed);
4363 if (names) {
4364 btrfs_warn(fs_info,
4365 "can't set the %s feature bit%s while mounted",
4366 names, strchr(names, ',') ? "s" : "");
4367 kfree(names);
4368 } else
4369 btrfs_warn(fs_info,
4370 "can't set %s bits 0x%llx while mounted",
4371 type, disallowed);
4372 return -EPERM;
4373 }
4374
4375 disallowed = clear_mask & ~safe_clear;
4376 if (disallowed) {
4377 names = btrfs_printable_features(set, disallowed);
4378 if (names) {
4379 btrfs_warn(fs_info,
4380 "can't clear the %s feature bit%s while mounted",
4381 names, strchr(names, ',') ? "s" : "");
4382 kfree(names);
4383 } else
4384 btrfs_warn(fs_info,
4385 "can't clear %s bits 0x%llx while mounted",
4386 type, disallowed);
4387 return -EPERM;
4388 }
4389
4390 return 0;
4391}
4392
4393#define check_feature(fs_info, change_mask, flags, mask_base) \
4394check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
4395 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4396 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4397 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4398
4399static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4400{
4401 struct inode *inode = file_inode(file);
4402 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4403 struct btrfs_root *root = BTRFS_I(inode)->root;
4404 struct btrfs_super_block *super_block = fs_info->super_copy;
4405 struct btrfs_ioctl_feature_flags flags[2];
4406 struct btrfs_trans_handle *trans;
4407 u64 newflags;
4408 int ret;
4409
4410 if (!capable(CAP_SYS_ADMIN))
4411 return -EPERM;
4412
4413 if (copy_from_user(flags, arg, sizeof(flags)))
4414 return -EFAULT;
4415
4416 /* Nothing to do */
4417 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4418 !flags[0].incompat_flags)
4419 return 0;
4420
4421 ret = check_feature(fs_info, flags[0].compat_flags,
4422 flags[1].compat_flags, COMPAT);
4423 if (ret)
4424 return ret;
4425
4426 ret = check_feature(fs_info, flags[0].compat_ro_flags,
4427 flags[1].compat_ro_flags, COMPAT_RO);
4428 if (ret)
4429 return ret;
4430
4431 ret = check_feature(fs_info, flags[0].incompat_flags,
4432 flags[1].incompat_flags, INCOMPAT);
4433 if (ret)
4434 return ret;
4435
4436 ret = mnt_want_write_file(file);
4437 if (ret)
4438 return ret;
4439
4440 trans = btrfs_start_transaction(root, 0);
4441 if (IS_ERR(trans)) {
4442 ret = PTR_ERR(trans);
4443 goto out_drop_write;
4444 }
4445
4446 spin_lock(&fs_info->super_lock);
4447 newflags = btrfs_super_compat_flags(super_block);
4448 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4449 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4450 btrfs_set_super_compat_flags(super_block, newflags);
4451
4452 newflags = btrfs_super_compat_ro_flags(super_block);
4453 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4454 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4455 btrfs_set_super_compat_ro_flags(super_block, newflags);
4456
4457 newflags = btrfs_super_incompat_flags(super_block);
4458 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4459 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4460 btrfs_set_super_incompat_flags(super_block, newflags);
4461 spin_unlock(&fs_info->super_lock);
4462
4463 ret = btrfs_commit_transaction(trans);
4464out_drop_write:
4465 mnt_drop_write_file(file);
4466
4467 return ret;
4468}
4469
4470static int _btrfs_ioctl_send(struct btrfs_inode *inode, void __user *argp, bool compat)
4471{
4472 struct btrfs_ioctl_send_args *arg;
4473 int ret;
4474
4475 if (compat) {
4476#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4477 struct btrfs_ioctl_send_args_32 args32 = { 0 };
4478
4479 ret = copy_from_user(&args32, argp, sizeof(args32));
4480 if (ret)
4481 return -EFAULT;
4482 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
4483 if (!arg)
4484 return -ENOMEM;
4485 arg->send_fd = args32.send_fd;
4486 arg->clone_sources_count = args32.clone_sources_count;
4487 arg->clone_sources = compat_ptr(args32.clone_sources);
4488 arg->parent_root = args32.parent_root;
4489 arg->flags = args32.flags;
4490 arg->version = args32.version;
4491 memcpy(arg->reserved, args32.reserved,
4492 sizeof(args32.reserved));
4493#else
4494 return -ENOTTY;
4495#endif
4496 } else {
4497 arg = memdup_user(argp, sizeof(*arg));
4498 if (IS_ERR(arg))
4499 return PTR_ERR(arg);
4500 }
4501 ret = btrfs_ioctl_send(inode, arg);
4502 kfree(arg);
4503 return ret;
4504}
4505
4506static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp,
4507 bool compat)
4508{
4509 struct btrfs_ioctl_encoded_io_args args = { 0 };
4510 size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args,
4511 flags);
4512 size_t copy_end;
4513 struct btrfs_inode *inode = BTRFS_I(file_inode(file));
4514 struct btrfs_fs_info *fs_info = inode->root->fs_info;
4515 struct extent_io_tree *io_tree = &inode->io_tree;
4516 struct iovec iovstack[UIO_FASTIOV];
4517 struct iovec *iov = iovstack;
4518 struct iov_iter iter;
4519 loff_t pos;
4520 struct kiocb kiocb;
4521 ssize_t ret;
4522 u64 disk_bytenr, disk_io_size;
4523 struct extent_state *cached_state = NULL;
4524
4525 if (!capable(CAP_SYS_ADMIN)) {
4526 ret = -EPERM;
4527 goto out_acct;
4528 }
4529
4530 if (compat) {
4531#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4532 struct btrfs_ioctl_encoded_io_args_32 args32;
4533
4534 copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32,
4535 flags);
4536 if (copy_from_user(&args32, argp, copy_end)) {
4537 ret = -EFAULT;
4538 goto out_acct;
4539 }
4540 args.iov = compat_ptr(args32.iov);
4541 args.iovcnt = args32.iovcnt;
4542 args.offset = args32.offset;
4543 args.flags = args32.flags;
4544#else
4545 return -ENOTTY;
4546#endif
4547 } else {
4548 copy_end = copy_end_kernel;
4549 if (copy_from_user(&args, argp, copy_end)) {
4550 ret = -EFAULT;
4551 goto out_acct;
4552 }
4553 }
4554 if (args.flags != 0) {
4555 ret = -EINVAL;
4556 goto out_acct;
4557 }
4558
4559 ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4560 &iov, &iter);
4561 if (ret < 0)
4562 goto out_acct;
4563
4564 if (iov_iter_count(&iter) == 0) {
4565 ret = 0;
4566 goto out_iov;
4567 }
4568 pos = args.offset;
4569 ret = rw_verify_area(READ, file, &pos, args.len);
4570 if (ret < 0)
4571 goto out_iov;
4572
4573 init_sync_kiocb(&kiocb, file);
4574 kiocb.ki_pos = pos;
4575
4576 ret = btrfs_encoded_read(&kiocb, &iter, &args, &cached_state,
4577 &disk_bytenr, &disk_io_size);
4578
4579 if (ret == -EIOCBQUEUED) {
4580 bool unlocked = false;
4581 u64 start, lockend, count;
4582
4583 start = ALIGN_DOWN(kiocb.ki_pos, fs_info->sectorsize);
4584 lockend = start + BTRFS_MAX_UNCOMPRESSED - 1;
4585
4586 if (args.compression)
4587 count = disk_io_size;
4588 else
4589 count = args.len;
4590
4591 ret = btrfs_encoded_read_regular(&kiocb, &iter, start, lockend,
4592 &cached_state, disk_bytenr,
4593 disk_io_size, count,
4594 args.compression, &unlocked);
4595
4596 if (!unlocked) {
4597 unlock_extent(io_tree, start, lockend, &cached_state);
4598 btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
4599 }
4600 }
4601
4602 if (ret >= 0) {
4603 fsnotify_access(file);
4604 if (copy_to_user(argp + copy_end,
4605 (char *)&args + copy_end_kernel,
4606 sizeof(args) - copy_end_kernel))
4607 ret = -EFAULT;
4608 }
4609
4610out_iov:
4611 kfree(iov);
4612out_acct:
4613 if (ret > 0)
4614 add_rchar(current, ret);
4615 inc_syscr(current);
4616 return ret;
4617}
4618
4619static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat)
4620{
4621 struct btrfs_ioctl_encoded_io_args args;
4622 struct iovec iovstack[UIO_FASTIOV];
4623 struct iovec *iov = iovstack;
4624 struct iov_iter iter;
4625 loff_t pos;
4626 struct kiocb kiocb;
4627 ssize_t ret;
4628
4629 if (!capable(CAP_SYS_ADMIN)) {
4630 ret = -EPERM;
4631 goto out_acct;
4632 }
4633
4634 if (!(file->f_mode & FMODE_WRITE)) {
4635 ret = -EBADF;
4636 goto out_acct;
4637 }
4638
4639 if (compat) {
4640#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4641 struct btrfs_ioctl_encoded_io_args_32 args32;
4642
4643 if (copy_from_user(&args32, argp, sizeof(args32))) {
4644 ret = -EFAULT;
4645 goto out_acct;
4646 }
4647 args.iov = compat_ptr(args32.iov);
4648 args.iovcnt = args32.iovcnt;
4649 args.offset = args32.offset;
4650 args.flags = args32.flags;
4651 args.len = args32.len;
4652 args.unencoded_len = args32.unencoded_len;
4653 args.unencoded_offset = args32.unencoded_offset;
4654 args.compression = args32.compression;
4655 args.encryption = args32.encryption;
4656 memcpy(args.reserved, args32.reserved, sizeof(args.reserved));
4657#else
4658 return -ENOTTY;
4659#endif
4660 } else {
4661 if (copy_from_user(&args, argp, sizeof(args))) {
4662 ret = -EFAULT;
4663 goto out_acct;
4664 }
4665 }
4666
4667 ret = -EINVAL;
4668 if (args.flags != 0)
4669 goto out_acct;
4670 if (memchr_inv(args.reserved, 0, sizeof(args.reserved)))
4671 goto out_acct;
4672 if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE &&
4673 args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE)
4674 goto out_acct;
4675 if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES ||
4676 args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES)
4677 goto out_acct;
4678 if (args.unencoded_offset > args.unencoded_len)
4679 goto out_acct;
4680 if (args.len > args.unencoded_len - args.unencoded_offset)
4681 goto out_acct;
4682
4683 ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4684 &iov, &iter);
4685 if (ret < 0)
4686 goto out_acct;
4687
4688 if (iov_iter_count(&iter) == 0) {
4689 ret = 0;
4690 goto out_iov;
4691 }
4692 pos = args.offset;
4693 ret = rw_verify_area(WRITE, file, &pos, args.len);
4694 if (ret < 0)
4695 goto out_iov;
4696
4697 init_sync_kiocb(&kiocb, file);
4698 ret = kiocb_set_rw_flags(&kiocb, 0, WRITE);
4699 if (ret)
4700 goto out_iov;
4701 kiocb.ki_pos = pos;
4702
4703 file_start_write(file);
4704
4705 ret = btrfs_do_write_iter(&kiocb, &iter, &args);
4706 if (ret > 0)
4707 fsnotify_modify(file);
4708
4709 file_end_write(file);
4710out_iov:
4711 kfree(iov);
4712out_acct:
4713 if (ret > 0)
4714 add_wchar(current, ret);
4715 inc_syscw(current);
4716 return ret;
4717}
4718
4719/*
4720 * Context that's attached to an encoded read io_uring command, in cmd->pdu. It
4721 * contains the fields in btrfs_uring_read_extent that are necessary to finish
4722 * off and cleanup the I/O in btrfs_uring_read_finished.
4723 */
4724struct btrfs_uring_priv {
4725 struct io_uring_cmd *cmd;
4726 struct page **pages;
4727 unsigned long nr_pages;
4728 struct kiocb iocb;
4729 struct iovec *iov;
4730 struct iov_iter iter;
4731 struct extent_state *cached_state;
4732 u64 count;
4733 u64 start;
4734 u64 lockend;
4735 int err;
4736 bool compressed;
4737};
4738
4739struct io_btrfs_cmd {
4740 struct btrfs_uring_priv *priv;
4741};
4742
4743static void btrfs_uring_read_finished(struct io_uring_cmd *cmd, unsigned int issue_flags)
4744{
4745 struct io_btrfs_cmd *bc = io_uring_cmd_to_pdu(cmd, struct io_btrfs_cmd);
4746 struct btrfs_uring_priv *priv = bc->priv;
4747 struct btrfs_inode *inode = BTRFS_I(file_inode(priv->iocb.ki_filp));
4748 struct extent_io_tree *io_tree = &inode->io_tree;
4749 unsigned long index;
4750 u64 cur;
4751 size_t page_offset;
4752 ssize_t ret;
4753
4754 /* The inode lock has already been acquired in btrfs_uring_read_extent. */
4755 btrfs_lockdep_inode_acquire(inode, i_rwsem);
4756
4757 if (priv->err) {
4758 ret = priv->err;
4759 goto out;
4760 }
4761
4762 if (priv->compressed) {
4763 index = 0;
4764 page_offset = 0;
4765 } else {
4766 index = (priv->iocb.ki_pos - priv->start) >> PAGE_SHIFT;
4767 page_offset = offset_in_page(priv->iocb.ki_pos - priv->start);
4768 }
4769 cur = 0;
4770 while (cur < priv->count) {
4771 size_t bytes = min_t(size_t, priv->count - cur, PAGE_SIZE - page_offset);
4772
4773 if (copy_page_to_iter(priv->pages[index], page_offset, bytes,
4774 &priv->iter) != bytes) {
4775 ret = -EFAULT;
4776 goto out;
4777 }
4778
4779 index++;
4780 cur += bytes;
4781 page_offset = 0;
4782 }
4783 ret = priv->count;
4784
4785out:
4786 unlock_extent(io_tree, priv->start, priv->lockend, &priv->cached_state);
4787 btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
4788
4789 io_uring_cmd_done(cmd, ret, 0, issue_flags);
4790 add_rchar(current, ret);
4791
4792 for (index = 0; index < priv->nr_pages; index++)
4793 __free_page(priv->pages[index]);
4794
4795 kfree(priv->pages);
4796 kfree(priv->iov);
4797 kfree(priv);
4798}
4799
4800void btrfs_uring_read_extent_endio(void *ctx, int err)
4801{
4802 struct btrfs_uring_priv *priv = ctx;
4803 struct io_btrfs_cmd *bc = io_uring_cmd_to_pdu(priv->cmd, struct io_btrfs_cmd);
4804
4805 priv->err = err;
4806 bc->priv = priv;
4807
4808 io_uring_cmd_complete_in_task(priv->cmd, btrfs_uring_read_finished);
4809}
4810
4811static int btrfs_uring_read_extent(struct kiocb *iocb, struct iov_iter *iter,
4812 u64 start, u64 lockend,
4813 struct extent_state *cached_state,
4814 u64 disk_bytenr, u64 disk_io_size,
4815 size_t count, bool compressed,
4816 struct iovec *iov, struct io_uring_cmd *cmd)
4817{
4818 struct btrfs_inode *inode = BTRFS_I(file_inode(iocb->ki_filp));
4819 struct extent_io_tree *io_tree = &inode->io_tree;
4820 struct page **pages;
4821 struct btrfs_uring_priv *priv = NULL;
4822 unsigned long nr_pages;
4823 int ret;
4824
4825 nr_pages = DIV_ROUND_UP(disk_io_size, PAGE_SIZE);
4826 pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
4827 if (!pages)
4828 return -ENOMEM;
4829 ret = btrfs_alloc_page_array(nr_pages, pages, 0);
4830 if (ret) {
4831 ret = -ENOMEM;
4832 goto out_fail;
4833 }
4834
4835 priv = kmalloc(sizeof(*priv), GFP_NOFS);
4836 if (!priv) {
4837 ret = -ENOMEM;
4838 goto out_fail;
4839 }
4840
4841 priv->iocb = *iocb;
4842 priv->iov = iov;
4843 priv->iter = *iter;
4844 priv->count = count;
4845 priv->cmd = cmd;
4846 priv->cached_state = cached_state;
4847 priv->compressed = compressed;
4848 priv->nr_pages = nr_pages;
4849 priv->pages = pages;
4850 priv->start = start;
4851 priv->lockend = lockend;
4852 priv->err = 0;
4853
4854 ret = btrfs_encoded_read_regular_fill_pages(inode, disk_bytenr,
4855 disk_io_size, pages, priv);
4856 if (ret && ret != -EIOCBQUEUED)
4857 goto out_fail;
4858
4859 /*
4860 * If we return -EIOCBQUEUED, we're deferring the cleanup to
4861 * btrfs_uring_read_finished(), which will handle unlocking the extent
4862 * and inode and freeing the allocations.
4863 */
4864
4865 /*
4866 * We're returning to userspace with the inode lock held, and that's
4867 * okay - it'll get unlocked in a worker thread. Call
4868 * btrfs_lockdep_inode_release() to avoid confusing lockdep.
4869 */
4870 btrfs_lockdep_inode_release(inode, i_rwsem);
4871
4872 return -EIOCBQUEUED;
4873
4874out_fail:
4875 unlock_extent(io_tree, start, lockend, &cached_state);
4876 btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
4877 kfree(priv);
4878 return ret;
4879}
4880
4881struct btrfs_uring_encoded_data {
4882 struct btrfs_ioctl_encoded_io_args args;
4883 struct iovec iovstack[UIO_FASTIOV];
4884 struct iovec *iov;
4885 struct iov_iter iter;
4886};
4887
4888static int btrfs_uring_encoded_read(struct io_uring_cmd *cmd, unsigned int issue_flags)
4889{
4890 size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, flags);
4891 size_t copy_end;
4892 int ret;
4893 u64 disk_bytenr, disk_io_size;
4894 struct file *file;
4895 struct btrfs_inode *inode;
4896 struct btrfs_fs_info *fs_info;
4897 struct extent_io_tree *io_tree;
4898 loff_t pos;
4899 struct kiocb kiocb;
4900 struct extent_state *cached_state = NULL;
4901 u64 start, lockend;
4902 void __user *sqe_addr;
4903 struct btrfs_uring_encoded_data *data = io_uring_cmd_get_async_data(cmd)->op_data;
4904
4905 if (!capable(CAP_SYS_ADMIN)) {
4906 ret = -EPERM;
4907 goto out_acct;
4908 }
4909 file = cmd->file;
4910 inode = BTRFS_I(file->f_inode);
4911 fs_info = inode->root->fs_info;
4912 io_tree = &inode->io_tree;
4913 sqe_addr = u64_to_user_ptr(READ_ONCE(cmd->sqe->addr));
4914
4915 if (issue_flags & IO_URING_F_COMPAT) {
4916#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4917 copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, flags);
4918#else
4919 return -ENOTTY;
4920#endif
4921 } else {
4922 copy_end = copy_end_kernel;
4923 }
4924
4925 if (!data) {
4926 data = kzalloc(sizeof(*data), GFP_NOFS);
4927 if (!data) {
4928 ret = -ENOMEM;
4929 goto out_acct;
4930 }
4931
4932 io_uring_cmd_get_async_data(cmd)->op_data = data;
4933
4934 if (issue_flags & IO_URING_F_COMPAT) {
4935#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4936 struct btrfs_ioctl_encoded_io_args_32 args32;
4937
4938 if (copy_from_user(&args32, sqe_addr, copy_end)) {
4939 ret = -EFAULT;
4940 goto out_acct;
4941 }
4942
4943 data->args.iov = compat_ptr(args32.iov);
4944 data->args.iovcnt = args32.iovcnt;
4945 data->args.offset = args32.offset;
4946 data->args.flags = args32.flags;
4947#endif
4948 } else {
4949 if (copy_from_user(&data->args, sqe_addr, copy_end)) {
4950 ret = -EFAULT;
4951 goto out_acct;
4952 }
4953 }
4954
4955 if (data->args.flags != 0) {
4956 ret = -EINVAL;
4957 goto out_acct;
4958 }
4959
4960 data->iov = data->iovstack;
4961 ret = import_iovec(ITER_DEST, data->args.iov, data->args.iovcnt,
4962 ARRAY_SIZE(data->iovstack), &data->iov,
4963 &data->iter);
4964 if (ret < 0)
4965 goto out_acct;
4966
4967 if (iov_iter_count(&data->iter) == 0) {
4968 ret = 0;
4969 goto out_free;
4970 }
4971 }
4972
4973 pos = data->args.offset;
4974 ret = rw_verify_area(READ, file, &pos, data->args.len);
4975 if (ret < 0)
4976 goto out_free;
4977
4978 init_sync_kiocb(&kiocb, file);
4979 kiocb.ki_pos = pos;
4980
4981 if (issue_flags & IO_URING_F_NONBLOCK)
4982 kiocb.ki_flags |= IOCB_NOWAIT;
4983
4984 start = ALIGN_DOWN(pos, fs_info->sectorsize);
4985 lockend = start + BTRFS_MAX_UNCOMPRESSED - 1;
4986
4987 ret = btrfs_encoded_read(&kiocb, &data->iter, &data->args, &cached_state,
4988 &disk_bytenr, &disk_io_size);
4989 if (ret < 0 && ret != -EIOCBQUEUED)
4990 goto out_free;
4991
4992 file_accessed(file);
4993
4994 if (copy_to_user(sqe_addr + copy_end,
4995 (const char *)&data->args + copy_end_kernel,
4996 sizeof(data->args) - copy_end_kernel)) {
4997 if (ret == -EIOCBQUEUED) {
4998 unlock_extent(io_tree, start, lockend, &cached_state);
4999 btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
5000 }
5001 ret = -EFAULT;
5002 goto out_free;
5003 }
5004
5005 if (ret == -EIOCBQUEUED) {
5006 u64 count = min_t(u64, iov_iter_count(&data->iter), disk_io_size);
5007
5008 /* Match ioctl by not returning past EOF if uncompressed. */
5009 if (!data->args.compression)
5010 count = min_t(u64, count, data->args.len);
5011
5012 ret = btrfs_uring_read_extent(&kiocb, &data->iter, start, lockend,
5013 cached_state, disk_bytenr, disk_io_size,
5014 count, data->args.compression,
5015 data->iov, cmd);
5016
5017 goto out_acct;
5018 }
5019
5020out_free:
5021 kfree(data->iov);
5022
5023out_acct:
5024 if (ret > 0)
5025 add_rchar(current, ret);
5026 inc_syscr(current);
5027
5028 return ret;
5029}
5030
5031int btrfs_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
5032{
5033 switch (cmd->cmd_op) {
5034 case BTRFS_IOC_ENCODED_READ:
5035#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5036 case BTRFS_IOC_ENCODED_READ_32:
5037#endif
5038 return btrfs_uring_encoded_read(cmd, issue_flags);
5039 }
5040
5041 return -EINVAL;
5042}
5043
5044static int btrfs_ioctl_subvol_sync(struct btrfs_fs_info *fs_info, void __user *argp)
5045{
5046 struct btrfs_root *root;
5047 struct btrfs_ioctl_subvol_wait args = { 0 };
5048 signed long sched_ret;
5049 int refs;
5050 u64 root_flags;
5051 bool wait_for_deletion = false;
5052 bool found = false;
5053
5054 if (copy_from_user(&args, argp, sizeof(args)))
5055 return -EFAULT;
5056
5057 switch (args.mode) {
5058 case BTRFS_SUBVOL_SYNC_WAIT_FOR_QUEUED:
5059 /*
5060 * Wait for the first one deleted that waits until all previous
5061 * are cleaned.
5062 */
5063 spin_lock(&fs_info->trans_lock);
5064 if (!list_empty(&fs_info->dead_roots)) {
5065 root = list_last_entry(&fs_info->dead_roots,
5066 struct btrfs_root, root_list);
5067 args.subvolid = btrfs_root_id(root);
5068 found = true;
5069 }
5070 spin_unlock(&fs_info->trans_lock);
5071 if (!found)
5072 return -ENOENT;
5073
5074 fallthrough;
5075 case BTRFS_SUBVOL_SYNC_WAIT_FOR_ONE:
5076 if ((0 < args.subvolid && args.subvolid < BTRFS_FIRST_FREE_OBJECTID) ||
5077 BTRFS_LAST_FREE_OBJECTID < args.subvolid)
5078 return -EINVAL;
5079 break;
5080 case BTRFS_SUBVOL_SYNC_COUNT:
5081 spin_lock(&fs_info->trans_lock);
5082 args.count = list_count_nodes(&fs_info->dead_roots);
5083 spin_unlock(&fs_info->trans_lock);
5084 if (copy_to_user(argp, &args, sizeof(args)))
5085 return -EFAULT;
5086 return 0;
5087 case BTRFS_SUBVOL_SYNC_PEEK_FIRST:
5088 spin_lock(&fs_info->trans_lock);
5089 /* Last in the list was deleted first. */
5090 if (!list_empty(&fs_info->dead_roots)) {
5091 root = list_last_entry(&fs_info->dead_roots,
5092 struct btrfs_root, root_list);
5093 args.subvolid = btrfs_root_id(root);
5094 } else {
5095 args.subvolid = 0;
5096 }
5097 spin_unlock(&fs_info->trans_lock);
5098 if (copy_to_user(argp, &args, sizeof(args)))
5099 return -EFAULT;
5100 return 0;
5101 case BTRFS_SUBVOL_SYNC_PEEK_LAST:
5102 spin_lock(&fs_info->trans_lock);
5103 /* First in the list was deleted last. */
5104 if (!list_empty(&fs_info->dead_roots)) {
5105 root = list_first_entry(&fs_info->dead_roots,
5106 struct btrfs_root, root_list);
5107 args.subvolid = btrfs_root_id(root);
5108 } else {
5109 args.subvolid = 0;
5110 }
5111 spin_unlock(&fs_info->trans_lock);
5112 if (copy_to_user(argp, &args, sizeof(args)))
5113 return -EFAULT;
5114 return 0;
5115 default:
5116 return -EINVAL;
5117 }
5118
5119 /* 32bit limitation: fs_roots_radix key is not wide enough. */
5120 if (sizeof(unsigned long) != sizeof(u64) && args.subvolid > U32_MAX)
5121 return -EOVERFLOW;
5122
5123 while (1) {
5124 /* Wait for the specific one. */
5125 if (down_read_interruptible(&fs_info->subvol_sem) == -EINTR)
5126 return -EINTR;
5127 refs = -1;
5128 spin_lock(&fs_info->fs_roots_radix_lock);
5129 root = radix_tree_lookup(&fs_info->fs_roots_radix,
5130 (unsigned long)args.subvolid);
5131 if (root) {
5132 spin_lock(&root->root_item_lock);
5133 refs = btrfs_root_refs(&root->root_item);
5134 root_flags = btrfs_root_flags(&root->root_item);
5135 spin_unlock(&root->root_item_lock);
5136 }
5137 spin_unlock(&fs_info->fs_roots_radix_lock);
5138 up_read(&fs_info->subvol_sem);
5139
5140 /* Subvolume does not exist. */
5141 if (!root)
5142 return -ENOENT;
5143
5144 /* Subvolume not deleted at all. */
5145 if (refs > 0)
5146 return -EEXIST;
5147 /* We've waited and now the subvolume is gone. */
5148 if (wait_for_deletion && refs == -1) {
5149 /* Return the one we waited for as the last one. */
5150 if (copy_to_user(argp, &args, sizeof(args)))
5151 return -EFAULT;
5152 return 0;
5153 }
5154
5155 /* Subvolume not found on the first try (deleted or never existed). */
5156 if (refs == -1)
5157 return -ENOENT;
5158
5159 wait_for_deletion = true;
5160 ASSERT(root_flags & BTRFS_ROOT_SUBVOL_DEAD);
5161 sched_ret = schedule_timeout_interruptible(HZ);
5162 /* Early wake up or error. */
5163 if (sched_ret != 0)
5164 return -EINTR;
5165 }
5166
5167 return 0;
5168}
5169
5170long btrfs_ioctl(struct file *file, unsigned int
5171 cmd, unsigned long arg)
5172{
5173 struct inode *inode = file_inode(file);
5174 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
5175 struct btrfs_root *root = BTRFS_I(inode)->root;
5176 void __user *argp = (void __user *)arg;
5177
5178 switch (cmd) {
5179 case FS_IOC_GETVERSION:
5180 return btrfs_ioctl_getversion(inode, argp);
5181 case FS_IOC_GETFSLABEL:
5182 return btrfs_ioctl_get_fslabel(fs_info, argp);
5183 case FS_IOC_SETFSLABEL:
5184 return btrfs_ioctl_set_fslabel(file, argp);
5185 case FITRIM:
5186 return btrfs_ioctl_fitrim(fs_info, argp);
5187 case BTRFS_IOC_SNAP_CREATE:
5188 return btrfs_ioctl_snap_create(file, argp, 0);
5189 case BTRFS_IOC_SNAP_CREATE_V2:
5190 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5191 case BTRFS_IOC_SUBVOL_CREATE:
5192 return btrfs_ioctl_snap_create(file, argp, 1);
5193 case BTRFS_IOC_SUBVOL_CREATE_V2:
5194 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5195 case BTRFS_IOC_SNAP_DESTROY:
5196 return btrfs_ioctl_snap_destroy(file, argp, false);
5197 case BTRFS_IOC_SNAP_DESTROY_V2:
5198 return btrfs_ioctl_snap_destroy(file, argp, true);
5199 case BTRFS_IOC_SUBVOL_GETFLAGS:
5200 return btrfs_ioctl_subvol_getflags(inode, argp);
5201 case BTRFS_IOC_SUBVOL_SETFLAGS:
5202 return btrfs_ioctl_subvol_setflags(file, argp);
5203 case BTRFS_IOC_DEFAULT_SUBVOL:
5204 return btrfs_ioctl_default_subvol(file, argp);
5205 case BTRFS_IOC_DEFRAG:
5206 return btrfs_ioctl_defrag(file, NULL);
5207 case BTRFS_IOC_DEFRAG_RANGE:
5208 return btrfs_ioctl_defrag(file, argp);
5209 case BTRFS_IOC_RESIZE:
5210 return btrfs_ioctl_resize(file, argp);
5211 case BTRFS_IOC_ADD_DEV:
5212 return btrfs_ioctl_add_dev(fs_info, argp);
5213 case BTRFS_IOC_RM_DEV:
5214 return btrfs_ioctl_rm_dev(file, argp);
5215 case BTRFS_IOC_RM_DEV_V2:
5216 return btrfs_ioctl_rm_dev_v2(file, argp);
5217 case BTRFS_IOC_FS_INFO:
5218 return btrfs_ioctl_fs_info(fs_info, argp);
5219 case BTRFS_IOC_DEV_INFO:
5220 return btrfs_ioctl_dev_info(fs_info, argp);
5221 case BTRFS_IOC_TREE_SEARCH:
5222 return btrfs_ioctl_tree_search(inode, argp);
5223 case BTRFS_IOC_TREE_SEARCH_V2:
5224 return btrfs_ioctl_tree_search_v2(inode, argp);
5225 case BTRFS_IOC_INO_LOOKUP:
5226 return btrfs_ioctl_ino_lookup(root, argp);
5227 case BTRFS_IOC_INO_PATHS:
5228 return btrfs_ioctl_ino_to_path(root, argp);
5229 case BTRFS_IOC_LOGICAL_INO:
5230 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5231 case BTRFS_IOC_LOGICAL_INO_V2:
5232 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
5233 case BTRFS_IOC_SPACE_INFO:
5234 return btrfs_ioctl_space_info(fs_info, argp);
5235 case BTRFS_IOC_SYNC: {
5236 int ret;
5237
5238 ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
5239 if (ret)
5240 return ret;
5241 ret = btrfs_sync_fs(inode->i_sb, 1);
5242 /*
5243 * There may be work for the cleaner kthread to do (subvolume
5244 * deletion, delayed iputs, defrag inodes, etc), so wake it up.
5245 */
5246 wake_up_process(fs_info->cleaner_kthread);
5247 return ret;
5248 }
5249 case BTRFS_IOC_START_SYNC:
5250 return btrfs_ioctl_start_sync(root, argp);
5251 case BTRFS_IOC_WAIT_SYNC:
5252 return btrfs_ioctl_wait_sync(fs_info, argp);
5253 case BTRFS_IOC_SCRUB:
5254 return btrfs_ioctl_scrub(file, argp);
5255 case BTRFS_IOC_SCRUB_CANCEL:
5256 return btrfs_ioctl_scrub_cancel(fs_info);
5257 case BTRFS_IOC_SCRUB_PROGRESS:
5258 return btrfs_ioctl_scrub_progress(fs_info, argp);
5259 case BTRFS_IOC_BALANCE_V2:
5260 return btrfs_ioctl_balance(file, argp);
5261 case BTRFS_IOC_BALANCE_CTL:
5262 return btrfs_ioctl_balance_ctl(fs_info, arg);
5263 case BTRFS_IOC_BALANCE_PROGRESS:
5264 return btrfs_ioctl_balance_progress(fs_info, argp);
5265 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5266 return btrfs_ioctl_set_received_subvol(file, argp);
5267#ifdef CONFIG_64BIT
5268 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5269 return btrfs_ioctl_set_received_subvol_32(file, argp);
5270#endif
5271 case BTRFS_IOC_SEND:
5272 return _btrfs_ioctl_send(BTRFS_I(inode), argp, false);
5273#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5274 case BTRFS_IOC_SEND_32:
5275 return _btrfs_ioctl_send(BTRFS_I(inode), argp, true);
5276#endif
5277 case BTRFS_IOC_GET_DEV_STATS:
5278 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5279 case BTRFS_IOC_QUOTA_CTL:
5280 return btrfs_ioctl_quota_ctl(file, argp);
5281 case BTRFS_IOC_QGROUP_ASSIGN:
5282 return btrfs_ioctl_qgroup_assign(file, argp);
5283 case BTRFS_IOC_QGROUP_CREATE:
5284 return btrfs_ioctl_qgroup_create(file, argp);
5285 case BTRFS_IOC_QGROUP_LIMIT:
5286 return btrfs_ioctl_qgroup_limit(file, argp);
5287 case BTRFS_IOC_QUOTA_RESCAN:
5288 return btrfs_ioctl_quota_rescan(file, argp);
5289 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5290 return btrfs_ioctl_quota_rescan_status(fs_info, argp);
5291 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5292 return btrfs_ioctl_quota_rescan_wait(fs_info);
5293 case BTRFS_IOC_DEV_REPLACE:
5294 return btrfs_ioctl_dev_replace(fs_info, argp);
5295 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5296 return btrfs_ioctl_get_supported_features(argp);
5297 case BTRFS_IOC_GET_FEATURES:
5298 return btrfs_ioctl_get_features(fs_info, argp);
5299 case BTRFS_IOC_SET_FEATURES:
5300 return btrfs_ioctl_set_features(file, argp);
5301 case BTRFS_IOC_GET_SUBVOL_INFO:
5302 return btrfs_ioctl_get_subvol_info(inode, argp);
5303 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5304 return btrfs_ioctl_get_subvol_rootref(root, argp);
5305 case BTRFS_IOC_INO_LOOKUP_USER:
5306 return btrfs_ioctl_ino_lookup_user(file, argp);
5307 case FS_IOC_ENABLE_VERITY:
5308 return fsverity_ioctl_enable(file, (const void __user *)argp);
5309 case FS_IOC_MEASURE_VERITY:
5310 return fsverity_ioctl_measure(file, argp);
5311 case BTRFS_IOC_ENCODED_READ:
5312 return btrfs_ioctl_encoded_read(file, argp, false);
5313 case BTRFS_IOC_ENCODED_WRITE:
5314 return btrfs_ioctl_encoded_write(file, argp, false);
5315#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5316 case BTRFS_IOC_ENCODED_READ_32:
5317 return btrfs_ioctl_encoded_read(file, argp, true);
5318 case BTRFS_IOC_ENCODED_WRITE_32:
5319 return btrfs_ioctl_encoded_write(file, argp, true);
5320#endif
5321 case BTRFS_IOC_SUBVOL_SYNC_WAIT:
5322 return btrfs_ioctl_subvol_sync(fs_info, argp);
5323 }
5324
5325 return -ENOTTY;
5326}
5327
5328#ifdef CONFIG_COMPAT
5329long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5330{
5331 /*
5332 * These all access 32-bit values anyway so no further
5333 * handling is necessary.
5334 */
5335 switch (cmd) {
5336 case FS_IOC32_GETVERSION:
5337 cmd = FS_IOC_GETVERSION;
5338 break;
5339 }
5340
5341 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
5342}
5343#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 "volumes.h"
38#include "locking.h"
39#include "backref.h"
40#include "send.h"
41#include "dev-replace.h"
42#include "props.h"
43#include "sysfs.h"
44#include "qgroup.h"
45#include "tree-log.h"
46#include "compression.h"
47#include "space-info.h"
48#include "block-group.h"
49#include "fs.h"
50#include "accessors.h"
51#include "extent-tree.h"
52#include "root-tree.h"
53#include "defrag.h"
54#include "dir-item.h"
55#include "uuid-tree.h"
56#include "ioctl.h"
57#include "file.h"
58#include "scrub.h"
59#include "super.h"
60
61#ifdef CONFIG_64BIT
62/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
63 * structures are incorrect, as the timespec structure from userspace
64 * is 4 bytes too small. We define these alternatives here to teach
65 * the kernel about the 32-bit struct packing.
66 */
67struct btrfs_ioctl_timespec_32 {
68 __u64 sec;
69 __u32 nsec;
70} __attribute__ ((__packed__));
71
72struct btrfs_ioctl_received_subvol_args_32 {
73 char uuid[BTRFS_UUID_SIZE]; /* in */
74 __u64 stransid; /* in */
75 __u64 rtransid; /* out */
76 struct btrfs_ioctl_timespec_32 stime; /* in */
77 struct btrfs_ioctl_timespec_32 rtime; /* out */
78 __u64 flags; /* in */
79 __u64 reserved[16]; /* in */
80} __attribute__ ((__packed__));
81
82#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
83 struct btrfs_ioctl_received_subvol_args_32)
84#endif
85
86#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
87struct btrfs_ioctl_send_args_32 {
88 __s64 send_fd; /* in */
89 __u64 clone_sources_count; /* in */
90 compat_uptr_t clone_sources; /* in */
91 __u64 parent_root; /* in */
92 __u64 flags; /* in */
93 __u32 version; /* in */
94 __u8 reserved[28]; /* in */
95} __attribute__ ((__packed__));
96
97#define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
98 struct btrfs_ioctl_send_args_32)
99
100struct btrfs_ioctl_encoded_io_args_32 {
101 compat_uptr_t iov;
102 compat_ulong_t iovcnt;
103 __s64 offset;
104 __u64 flags;
105 __u64 len;
106 __u64 unencoded_len;
107 __u64 unencoded_offset;
108 __u32 compression;
109 __u32 encryption;
110 __u8 reserved[64];
111};
112
113#define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \
114 struct btrfs_ioctl_encoded_io_args_32)
115#define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \
116 struct btrfs_ioctl_encoded_io_args_32)
117#endif
118
119/* Mask out flags that are inappropriate for the given type of inode. */
120static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
121 unsigned int flags)
122{
123 if (S_ISDIR(inode->i_mode))
124 return flags;
125 else if (S_ISREG(inode->i_mode))
126 return flags & ~FS_DIRSYNC_FL;
127 else
128 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
129}
130
131/*
132 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
133 * ioctl.
134 */
135static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode)
136{
137 unsigned int iflags = 0;
138 u32 flags = binode->flags;
139 u32 ro_flags = binode->ro_flags;
140
141 if (flags & BTRFS_INODE_SYNC)
142 iflags |= FS_SYNC_FL;
143 if (flags & BTRFS_INODE_IMMUTABLE)
144 iflags |= FS_IMMUTABLE_FL;
145 if (flags & BTRFS_INODE_APPEND)
146 iflags |= FS_APPEND_FL;
147 if (flags & BTRFS_INODE_NODUMP)
148 iflags |= FS_NODUMP_FL;
149 if (flags & BTRFS_INODE_NOATIME)
150 iflags |= FS_NOATIME_FL;
151 if (flags & BTRFS_INODE_DIRSYNC)
152 iflags |= FS_DIRSYNC_FL;
153 if (flags & BTRFS_INODE_NODATACOW)
154 iflags |= FS_NOCOW_FL;
155 if (ro_flags & BTRFS_INODE_RO_VERITY)
156 iflags |= FS_VERITY_FL;
157
158 if (flags & BTRFS_INODE_NOCOMPRESS)
159 iflags |= FS_NOCOMP_FL;
160 else if (flags & BTRFS_INODE_COMPRESS)
161 iflags |= FS_COMPR_FL;
162
163 return iflags;
164}
165
166/*
167 * Update inode->i_flags based on the btrfs internal flags.
168 */
169void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
170{
171 struct btrfs_inode *binode = BTRFS_I(inode);
172 unsigned int new_fl = 0;
173
174 if (binode->flags & BTRFS_INODE_SYNC)
175 new_fl |= S_SYNC;
176 if (binode->flags & BTRFS_INODE_IMMUTABLE)
177 new_fl |= S_IMMUTABLE;
178 if (binode->flags & BTRFS_INODE_APPEND)
179 new_fl |= S_APPEND;
180 if (binode->flags & BTRFS_INODE_NOATIME)
181 new_fl |= S_NOATIME;
182 if (binode->flags & BTRFS_INODE_DIRSYNC)
183 new_fl |= S_DIRSYNC;
184 if (binode->ro_flags & BTRFS_INODE_RO_VERITY)
185 new_fl |= S_VERITY;
186
187 set_mask_bits(&inode->i_flags,
188 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC |
189 S_VERITY, new_fl);
190}
191
192/*
193 * Check if @flags are a supported and valid set of FS_*_FL flags and that
194 * the old and new flags are not conflicting
195 */
196static int check_fsflags(unsigned int old_flags, unsigned int flags)
197{
198 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
199 FS_NOATIME_FL | FS_NODUMP_FL | \
200 FS_SYNC_FL | FS_DIRSYNC_FL | \
201 FS_NOCOMP_FL | FS_COMPR_FL |
202 FS_NOCOW_FL))
203 return -EOPNOTSUPP;
204
205 /* COMPR and NOCOMP on new/old are valid */
206 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
207 return -EINVAL;
208
209 if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
210 return -EINVAL;
211
212 /* NOCOW and compression options are mutually exclusive */
213 if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
214 return -EINVAL;
215 if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
216 return -EINVAL;
217
218 return 0;
219}
220
221static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
222 unsigned int flags)
223{
224 if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL))
225 return -EPERM;
226
227 return 0;
228}
229
230int btrfs_check_ioctl_vol_args_path(const struct btrfs_ioctl_vol_args *vol_args)
231{
232 if (memchr(vol_args->name, 0, sizeof(vol_args->name)) == NULL)
233 return -ENAMETOOLONG;
234 return 0;
235}
236
237static int btrfs_check_ioctl_vol_args2_subvol_name(const struct btrfs_ioctl_vol_args_v2 *vol_args2)
238{
239 if (memchr(vol_args2->name, 0, sizeof(vol_args2->name)) == NULL)
240 return -ENAMETOOLONG;
241 return 0;
242}
243
244/*
245 * Set flags/xflags from the internal inode flags. The remaining items of
246 * fsxattr are zeroed.
247 */
248int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
249{
250 struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
251
252 fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode));
253 return 0;
254}
255
256int btrfs_fileattr_set(struct mnt_idmap *idmap,
257 struct dentry *dentry, struct fileattr *fa)
258{
259 struct inode *inode = d_inode(dentry);
260 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
261 struct btrfs_inode *binode = BTRFS_I(inode);
262 struct btrfs_root *root = binode->root;
263 struct btrfs_trans_handle *trans;
264 unsigned int fsflags, old_fsflags;
265 int ret;
266 const char *comp = NULL;
267 u32 binode_flags;
268
269 if (btrfs_root_readonly(root))
270 return -EROFS;
271
272 if (fileattr_has_fsx(fa))
273 return -EOPNOTSUPP;
274
275 fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
276 old_fsflags = btrfs_inode_flags_to_fsflags(binode);
277 ret = check_fsflags(old_fsflags, fsflags);
278 if (ret)
279 return ret;
280
281 ret = check_fsflags_compatible(fs_info, fsflags);
282 if (ret)
283 return ret;
284
285 binode_flags = binode->flags;
286 if (fsflags & FS_SYNC_FL)
287 binode_flags |= BTRFS_INODE_SYNC;
288 else
289 binode_flags &= ~BTRFS_INODE_SYNC;
290 if (fsflags & FS_IMMUTABLE_FL)
291 binode_flags |= BTRFS_INODE_IMMUTABLE;
292 else
293 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
294 if (fsflags & FS_APPEND_FL)
295 binode_flags |= BTRFS_INODE_APPEND;
296 else
297 binode_flags &= ~BTRFS_INODE_APPEND;
298 if (fsflags & FS_NODUMP_FL)
299 binode_flags |= BTRFS_INODE_NODUMP;
300 else
301 binode_flags &= ~BTRFS_INODE_NODUMP;
302 if (fsflags & FS_NOATIME_FL)
303 binode_flags |= BTRFS_INODE_NOATIME;
304 else
305 binode_flags &= ~BTRFS_INODE_NOATIME;
306
307 /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
308 if (!fa->flags_valid) {
309 /* 1 item for the inode */
310 trans = btrfs_start_transaction(root, 1);
311 if (IS_ERR(trans))
312 return PTR_ERR(trans);
313 goto update_flags;
314 }
315
316 if (fsflags & FS_DIRSYNC_FL)
317 binode_flags |= BTRFS_INODE_DIRSYNC;
318 else
319 binode_flags &= ~BTRFS_INODE_DIRSYNC;
320 if (fsflags & FS_NOCOW_FL) {
321 if (S_ISREG(inode->i_mode)) {
322 /*
323 * It's safe to turn csums off here, no extents exist.
324 * Otherwise we want the flag to reflect the real COW
325 * status of the file and will not set it.
326 */
327 if (inode->i_size == 0)
328 binode_flags |= BTRFS_INODE_NODATACOW |
329 BTRFS_INODE_NODATASUM;
330 } else {
331 binode_flags |= BTRFS_INODE_NODATACOW;
332 }
333 } else {
334 /*
335 * Revert back under same assumptions as above
336 */
337 if (S_ISREG(inode->i_mode)) {
338 if (inode->i_size == 0)
339 binode_flags &= ~(BTRFS_INODE_NODATACOW |
340 BTRFS_INODE_NODATASUM);
341 } else {
342 binode_flags &= ~BTRFS_INODE_NODATACOW;
343 }
344 }
345
346 /*
347 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
348 * flag may be changed automatically if compression code won't make
349 * things smaller.
350 */
351 if (fsflags & FS_NOCOMP_FL) {
352 binode_flags &= ~BTRFS_INODE_COMPRESS;
353 binode_flags |= BTRFS_INODE_NOCOMPRESS;
354 } else if (fsflags & FS_COMPR_FL) {
355
356 if (IS_SWAPFILE(inode))
357 return -ETXTBSY;
358
359 binode_flags |= BTRFS_INODE_COMPRESS;
360 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
361
362 comp = btrfs_compress_type2str(fs_info->compress_type);
363 if (!comp || comp[0] == 0)
364 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
365 } else {
366 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
367 }
368
369 /*
370 * 1 for inode item
371 * 2 for properties
372 */
373 trans = btrfs_start_transaction(root, 3);
374 if (IS_ERR(trans))
375 return PTR_ERR(trans);
376
377 if (comp) {
378 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
379 strlen(comp), 0);
380 if (ret) {
381 btrfs_abort_transaction(trans, ret);
382 goto out_end_trans;
383 }
384 } else {
385 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
386 0, 0);
387 if (ret && ret != -ENODATA) {
388 btrfs_abort_transaction(trans, ret);
389 goto out_end_trans;
390 }
391 }
392
393update_flags:
394 binode->flags = binode_flags;
395 btrfs_sync_inode_flags_to_i_flags(inode);
396 inode_inc_iversion(inode);
397 inode_set_ctime_current(inode);
398 ret = btrfs_update_inode(trans, BTRFS_I(inode));
399
400 out_end_trans:
401 btrfs_end_transaction(trans);
402 return ret;
403}
404
405/*
406 * Start exclusive operation @type, return true on success
407 */
408bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
409 enum btrfs_exclusive_operation type)
410{
411 bool ret = false;
412
413 spin_lock(&fs_info->super_lock);
414 if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) {
415 fs_info->exclusive_operation = type;
416 ret = true;
417 }
418 spin_unlock(&fs_info->super_lock);
419
420 return ret;
421}
422
423/*
424 * Conditionally allow to enter the exclusive operation in case it's compatible
425 * with the running one. This must be paired with btrfs_exclop_start_unlock and
426 * btrfs_exclop_finish.
427 *
428 * Compatibility:
429 * - the same type is already running
430 * - when trying to add a device and balance has been paused
431 * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller
432 * must check the condition first that would allow none -> @type
433 */
434bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
435 enum btrfs_exclusive_operation type)
436{
437 spin_lock(&fs_info->super_lock);
438 if (fs_info->exclusive_operation == type ||
439 (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED &&
440 type == BTRFS_EXCLOP_DEV_ADD))
441 return true;
442
443 spin_unlock(&fs_info->super_lock);
444 return false;
445}
446
447void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info)
448{
449 spin_unlock(&fs_info->super_lock);
450}
451
452void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
453{
454 spin_lock(&fs_info->super_lock);
455 WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
456 spin_unlock(&fs_info->super_lock);
457 sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
458}
459
460void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
461 enum btrfs_exclusive_operation op)
462{
463 switch (op) {
464 case BTRFS_EXCLOP_BALANCE_PAUSED:
465 spin_lock(&fs_info->super_lock);
466 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE ||
467 fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD ||
468 fs_info->exclusive_operation == BTRFS_EXCLOP_NONE ||
469 fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
470 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED;
471 spin_unlock(&fs_info->super_lock);
472 break;
473 case BTRFS_EXCLOP_BALANCE:
474 spin_lock(&fs_info->super_lock);
475 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
476 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE;
477 spin_unlock(&fs_info->super_lock);
478 break;
479 default:
480 btrfs_warn(fs_info,
481 "invalid exclop balance operation %d requested", op);
482 }
483}
484
485static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg)
486{
487 return put_user(inode->i_generation, arg);
488}
489
490static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
491 void __user *arg)
492{
493 struct btrfs_device *device;
494 struct fstrim_range range;
495 u64 minlen = ULLONG_MAX;
496 u64 num_devices = 0;
497 int ret;
498
499 if (!capable(CAP_SYS_ADMIN))
500 return -EPERM;
501
502 /*
503 * btrfs_trim_block_group() depends on space cache, which is not
504 * available in zoned filesystem. So, disallow fitrim on a zoned
505 * filesystem for now.
506 */
507 if (btrfs_is_zoned(fs_info))
508 return -EOPNOTSUPP;
509
510 /*
511 * If the fs is mounted with nologreplay, which requires it to be
512 * mounted in RO mode as well, we can not allow discard on free space
513 * inside block groups, because log trees refer to extents that are not
514 * pinned in a block group's free space cache (pinning the extents is
515 * precisely the first phase of replaying a log tree).
516 */
517 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
518 return -EROFS;
519
520 rcu_read_lock();
521 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
522 dev_list) {
523 if (!device->bdev || !bdev_max_discard_sectors(device->bdev))
524 continue;
525 num_devices++;
526 minlen = min_t(u64, bdev_discard_granularity(device->bdev),
527 minlen);
528 }
529 rcu_read_unlock();
530
531 if (!num_devices)
532 return -EOPNOTSUPP;
533 if (copy_from_user(&range, arg, sizeof(range)))
534 return -EFAULT;
535
536 /*
537 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
538 * block group is in the logical address space, which can be any
539 * sectorsize aligned bytenr in the range [0, U64_MAX].
540 */
541 if (range.len < fs_info->sectorsize)
542 return -EINVAL;
543
544 range.minlen = max(range.minlen, minlen);
545 ret = btrfs_trim_fs(fs_info, &range);
546 if (ret < 0)
547 return ret;
548
549 if (copy_to_user(arg, &range, sizeof(range)))
550 return -EFAULT;
551
552 return 0;
553}
554
555int __pure btrfs_is_empty_uuid(u8 *uuid)
556{
557 int i;
558
559 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
560 if (uuid[i])
561 return 0;
562 }
563 return 1;
564}
565
566/*
567 * Calculate the number of transaction items to reserve for creating a subvolume
568 * or snapshot, not including the inode, directory entries, or parent directory.
569 */
570static unsigned int create_subvol_num_items(struct btrfs_qgroup_inherit *inherit)
571{
572 /*
573 * 1 to add root block
574 * 1 to add root item
575 * 1 to add root ref
576 * 1 to add root backref
577 * 1 to add UUID item
578 * 1 to add qgroup info
579 * 1 to add qgroup limit
580 *
581 * Ideally the last two would only be accounted if qgroups are enabled,
582 * but that can change between now and the time we would insert them.
583 */
584 unsigned int num_items = 7;
585
586 if (inherit) {
587 /* 2 to add qgroup relations for each inherited qgroup */
588 num_items += 2 * inherit->num_qgroups;
589 }
590 return num_items;
591}
592
593static noinline int create_subvol(struct mnt_idmap *idmap,
594 struct inode *dir, struct dentry *dentry,
595 struct btrfs_qgroup_inherit *inherit)
596{
597 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
598 struct btrfs_trans_handle *trans;
599 struct btrfs_key key;
600 struct btrfs_root_item *root_item;
601 struct btrfs_inode_item *inode_item;
602 struct extent_buffer *leaf;
603 struct btrfs_root *root = BTRFS_I(dir)->root;
604 struct btrfs_root *new_root;
605 struct btrfs_block_rsv block_rsv;
606 struct timespec64 cur_time = current_time(dir);
607 struct btrfs_new_inode_args new_inode_args = {
608 .dir = dir,
609 .dentry = dentry,
610 .subvol = true,
611 };
612 unsigned int trans_num_items;
613 int ret;
614 dev_t anon_dev;
615 u64 objectid;
616 u64 qgroup_reserved = 0;
617
618 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
619 if (!root_item)
620 return -ENOMEM;
621
622 ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid);
623 if (ret)
624 goto out_root_item;
625
626 /*
627 * Don't create subvolume whose level is not zero. Or qgroup will be
628 * screwed up since it assumes subvolume qgroup's level to be 0.
629 */
630 if (btrfs_qgroup_level(objectid)) {
631 ret = -ENOSPC;
632 goto out_root_item;
633 }
634
635 ret = get_anon_bdev(&anon_dev);
636 if (ret < 0)
637 goto out_root_item;
638
639 new_inode_args.inode = btrfs_new_subvol_inode(idmap, dir);
640 if (!new_inode_args.inode) {
641 ret = -ENOMEM;
642 goto out_anon_dev;
643 }
644 ret = btrfs_new_inode_prepare(&new_inode_args, &trans_num_items);
645 if (ret)
646 goto out_inode;
647 trans_num_items += create_subvol_num_items(inherit);
648
649 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
650 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
651 trans_num_items, false);
652 if (ret)
653 goto out_new_inode_args;
654 qgroup_reserved = block_rsv.qgroup_rsv_reserved;
655
656 trans = btrfs_start_transaction(root, 0);
657 if (IS_ERR(trans)) {
658 ret = PTR_ERR(trans);
659 goto out_release_rsv;
660 }
661 ret = btrfs_record_root_in_trans(trans, BTRFS_I(dir)->root);
662 if (ret)
663 goto out;
664 btrfs_qgroup_convert_reserved_meta(root, qgroup_reserved);
665 qgroup_reserved = 0;
666 trans->block_rsv = &block_rsv;
667 trans->bytes_reserved = block_rsv.size;
668 /* Tree log can't currently deal with an inode which is a new root. */
669 btrfs_set_log_full_commit(trans);
670
671 ret = btrfs_qgroup_inherit(trans, 0, objectid, root->root_key.objectid, inherit);
672 if (ret)
673 goto out;
674
675 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
676 0, BTRFS_NESTING_NORMAL);
677 if (IS_ERR(leaf)) {
678 ret = PTR_ERR(leaf);
679 goto out;
680 }
681
682 btrfs_mark_buffer_dirty(trans, leaf);
683
684 inode_item = &root_item->inode;
685 btrfs_set_stack_inode_generation(inode_item, 1);
686 btrfs_set_stack_inode_size(inode_item, 3);
687 btrfs_set_stack_inode_nlink(inode_item, 1);
688 btrfs_set_stack_inode_nbytes(inode_item,
689 fs_info->nodesize);
690 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
691
692 btrfs_set_root_flags(root_item, 0);
693 btrfs_set_root_limit(root_item, 0);
694 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
695
696 btrfs_set_root_bytenr(root_item, leaf->start);
697 btrfs_set_root_generation(root_item, trans->transid);
698 btrfs_set_root_level(root_item, 0);
699 btrfs_set_root_refs(root_item, 1);
700 btrfs_set_root_used(root_item, leaf->len);
701 btrfs_set_root_last_snapshot(root_item, 0);
702
703 btrfs_set_root_generation_v2(root_item,
704 btrfs_root_generation(root_item));
705 generate_random_guid(root_item->uuid);
706 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
707 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
708 root_item->ctime = root_item->otime;
709 btrfs_set_root_ctransid(root_item, trans->transid);
710 btrfs_set_root_otransid(root_item, trans->transid);
711
712 btrfs_tree_unlock(leaf);
713
714 btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID);
715
716 key.objectid = objectid;
717 key.offset = 0;
718 key.type = BTRFS_ROOT_ITEM_KEY;
719 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
720 root_item);
721 if (ret) {
722 /*
723 * Since we don't abort the transaction in this case, free the
724 * tree block so that we don't leak space and leave the
725 * filesystem in an inconsistent state (an extent item in the
726 * extent tree with a backreference for a root that does not
727 * exists).
728 */
729 btrfs_tree_lock(leaf);
730 btrfs_clear_buffer_dirty(trans, leaf);
731 btrfs_tree_unlock(leaf);
732 btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
733 free_extent_buffer(leaf);
734 goto out;
735 }
736
737 free_extent_buffer(leaf);
738 leaf = NULL;
739
740 new_root = btrfs_get_new_fs_root(fs_info, objectid, &anon_dev);
741 if (IS_ERR(new_root)) {
742 ret = PTR_ERR(new_root);
743 btrfs_abort_transaction(trans, ret);
744 goto out;
745 }
746 /* anon_dev is owned by new_root now. */
747 anon_dev = 0;
748 BTRFS_I(new_inode_args.inode)->root = new_root;
749 /* ... and new_root is owned by new_inode_args.inode now. */
750
751 ret = btrfs_record_root_in_trans(trans, new_root);
752 if (ret) {
753 btrfs_abort_transaction(trans, ret);
754 goto out;
755 }
756
757 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
758 BTRFS_UUID_KEY_SUBVOL, objectid);
759 if (ret) {
760 btrfs_abort_transaction(trans, ret);
761 goto out;
762 }
763
764 ret = btrfs_create_new_inode(trans, &new_inode_args);
765 if (ret) {
766 btrfs_abort_transaction(trans, ret);
767 goto out;
768 }
769
770 d_instantiate_new(dentry, new_inode_args.inode);
771 new_inode_args.inode = NULL;
772
773out:
774 trans->block_rsv = NULL;
775 trans->bytes_reserved = 0;
776 btrfs_end_transaction(trans);
777out_release_rsv:
778 btrfs_block_rsv_release(fs_info, &block_rsv, (u64)-1, NULL);
779 if (qgroup_reserved)
780 btrfs_qgroup_free_meta_prealloc(root, qgroup_reserved);
781out_new_inode_args:
782 btrfs_new_inode_args_destroy(&new_inode_args);
783out_inode:
784 iput(new_inode_args.inode);
785out_anon_dev:
786 if (anon_dev)
787 free_anon_bdev(anon_dev);
788out_root_item:
789 kfree(root_item);
790 return ret;
791}
792
793static int create_snapshot(struct btrfs_root *root, struct inode *dir,
794 struct dentry *dentry, bool readonly,
795 struct btrfs_qgroup_inherit *inherit)
796{
797 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
798 struct inode *inode;
799 struct btrfs_pending_snapshot *pending_snapshot;
800 unsigned int trans_num_items;
801 struct btrfs_trans_handle *trans;
802 struct btrfs_block_rsv *block_rsv;
803 u64 qgroup_reserved = 0;
804 int ret;
805
806 /* We do not support snapshotting right now. */
807 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
808 btrfs_warn(fs_info,
809 "extent tree v2 doesn't support snapshotting yet");
810 return -EOPNOTSUPP;
811 }
812
813 if (btrfs_root_refs(&root->root_item) == 0)
814 return -ENOENT;
815
816 if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
817 return -EINVAL;
818
819 if (atomic_read(&root->nr_swapfiles)) {
820 btrfs_warn(fs_info,
821 "cannot snapshot subvolume with active swapfile");
822 return -ETXTBSY;
823 }
824
825 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
826 if (!pending_snapshot)
827 return -ENOMEM;
828
829 ret = get_anon_bdev(&pending_snapshot->anon_dev);
830 if (ret < 0)
831 goto free_pending;
832 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
833 GFP_KERNEL);
834 pending_snapshot->path = btrfs_alloc_path();
835 if (!pending_snapshot->root_item || !pending_snapshot->path) {
836 ret = -ENOMEM;
837 goto free_pending;
838 }
839
840 block_rsv = &pending_snapshot->block_rsv;
841 btrfs_init_block_rsv(block_rsv, BTRFS_BLOCK_RSV_TEMP);
842 /*
843 * 1 to add dir item
844 * 1 to add dir index
845 * 1 to update parent inode item
846 */
847 trans_num_items = create_subvol_num_items(inherit) + 3;
848 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, block_rsv,
849 trans_num_items, false);
850 if (ret)
851 goto free_pending;
852 qgroup_reserved = block_rsv->qgroup_rsv_reserved;
853
854 pending_snapshot->dentry = dentry;
855 pending_snapshot->root = root;
856 pending_snapshot->readonly = readonly;
857 pending_snapshot->dir = dir;
858 pending_snapshot->inherit = inherit;
859
860 trans = btrfs_start_transaction(root, 0);
861 if (IS_ERR(trans)) {
862 ret = PTR_ERR(trans);
863 goto fail;
864 }
865 ret = btrfs_record_root_in_trans(trans, BTRFS_I(dir)->root);
866 if (ret) {
867 btrfs_end_transaction(trans);
868 goto fail;
869 }
870 btrfs_qgroup_convert_reserved_meta(root, qgroup_reserved);
871 qgroup_reserved = 0;
872
873 trans->pending_snapshot = pending_snapshot;
874
875 ret = btrfs_commit_transaction(trans);
876 if (ret)
877 goto fail;
878
879 ret = pending_snapshot->error;
880 if (ret)
881 goto fail;
882
883 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
884 if (ret)
885 goto fail;
886
887 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
888 if (IS_ERR(inode)) {
889 ret = PTR_ERR(inode);
890 goto fail;
891 }
892
893 d_instantiate(dentry, inode);
894 ret = 0;
895 pending_snapshot->anon_dev = 0;
896fail:
897 /* Prevent double freeing of anon_dev */
898 if (ret && pending_snapshot->snap)
899 pending_snapshot->snap->anon_dev = 0;
900 btrfs_put_root(pending_snapshot->snap);
901 btrfs_block_rsv_release(fs_info, block_rsv, (u64)-1, NULL);
902 if (qgroup_reserved)
903 btrfs_qgroup_free_meta_prealloc(root, qgroup_reserved);
904free_pending:
905 if (pending_snapshot->anon_dev)
906 free_anon_bdev(pending_snapshot->anon_dev);
907 kfree(pending_snapshot->root_item);
908 btrfs_free_path(pending_snapshot->path);
909 kfree(pending_snapshot);
910
911 return ret;
912}
913
914/* copy of may_delete in fs/namei.c()
915 * Check whether we can remove a link victim from directory dir, check
916 * whether the type of victim is right.
917 * 1. We can't do it if dir is read-only (done in permission())
918 * 2. We should have write and exec permissions on dir
919 * 3. We can't remove anything from append-only dir
920 * 4. We can't do anything with immutable dir (done in permission())
921 * 5. If the sticky bit on dir is set we should either
922 * a. be owner of dir, or
923 * b. be owner of victim, or
924 * c. have CAP_FOWNER capability
925 * 6. If the victim is append-only or immutable we can't do anything with
926 * links pointing to it.
927 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
928 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
929 * 9. We can't remove a root or mountpoint.
930 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
931 * nfs_async_unlink().
932 */
933
934static int btrfs_may_delete(struct mnt_idmap *idmap,
935 struct inode *dir, struct dentry *victim, int isdir)
936{
937 int error;
938
939 if (d_really_is_negative(victim))
940 return -ENOENT;
941
942 /* The @victim is not inside @dir. */
943 if (d_inode(victim->d_parent) != dir)
944 return -EINVAL;
945 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
946
947 error = inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC);
948 if (error)
949 return error;
950 if (IS_APPEND(dir))
951 return -EPERM;
952 if (check_sticky(idmap, dir, d_inode(victim)) ||
953 IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
954 IS_SWAPFILE(d_inode(victim)))
955 return -EPERM;
956 if (isdir) {
957 if (!d_is_dir(victim))
958 return -ENOTDIR;
959 if (IS_ROOT(victim))
960 return -EBUSY;
961 } else if (d_is_dir(victim))
962 return -EISDIR;
963 if (IS_DEADDIR(dir))
964 return -ENOENT;
965 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
966 return -EBUSY;
967 return 0;
968}
969
970/* copy of may_create in fs/namei.c() */
971static inline int btrfs_may_create(struct mnt_idmap *idmap,
972 struct inode *dir, struct dentry *child)
973{
974 if (d_really_is_positive(child))
975 return -EEXIST;
976 if (IS_DEADDIR(dir))
977 return -ENOENT;
978 if (!fsuidgid_has_mapping(dir->i_sb, idmap))
979 return -EOVERFLOW;
980 return inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC);
981}
982
983/*
984 * Create a new subvolume below @parent. This is largely modeled after
985 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
986 * inside this filesystem so it's quite a bit simpler.
987 */
988static noinline int btrfs_mksubvol(const struct path *parent,
989 struct mnt_idmap *idmap,
990 const char *name, int namelen,
991 struct btrfs_root *snap_src,
992 bool readonly,
993 struct btrfs_qgroup_inherit *inherit)
994{
995 struct inode *dir = d_inode(parent->dentry);
996 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
997 struct dentry *dentry;
998 struct fscrypt_str name_str = FSTR_INIT((char *)name, namelen);
999 int error;
1000
1001 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
1002 if (error == -EINTR)
1003 return error;
1004
1005 dentry = lookup_one(idmap, name, parent->dentry, namelen);
1006 error = PTR_ERR(dentry);
1007 if (IS_ERR(dentry))
1008 goto out_unlock;
1009
1010 error = btrfs_may_create(idmap, dir, dentry);
1011 if (error)
1012 goto out_dput;
1013
1014 /*
1015 * even if this name doesn't exist, we may get hash collisions.
1016 * check for them now when we can safely fail
1017 */
1018 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
1019 dir->i_ino, &name_str);
1020 if (error)
1021 goto out_dput;
1022
1023 down_read(&fs_info->subvol_sem);
1024
1025 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
1026 goto out_up_read;
1027
1028 if (snap_src)
1029 error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
1030 else
1031 error = create_subvol(idmap, dir, dentry, inherit);
1032
1033 if (!error)
1034 fsnotify_mkdir(dir, dentry);
1035out_up_read:
1036 up_read(&fs_info->subvol_sem);
1037out_dput:
1038 dput(dentry);
1039out_unlock:
1040 btrfs_inode_unlock(BTRFS_I(dir), 0);
1041 return error;
1042}
1043
1044static noinline int btrfs_mksnapshot(const struct path *parent,
1045 struct mnt_idmap *idmap,
1046 const char *name, int namelen,
1047 struct btrfs_root *root,
1048 bool readonly,
1049 struct btrfs_qgroup_inherit *inherit)
1050{
1051 int ret;
1052 bool snapshot_force_cow = false;
1053
1054 /*
1055 * Force new buffered writes to reserve space even when NOCOW is
1056 * possible. This is to avoid later writeback (running dealloc) to
1057 * fallback to COW mode and unexpectedly fail with ENOSPC.
1058 */
1059 btrfs_drew_read_lock(&root->snapshot_lock);
1060
1061 ret = btrfs_start_delalloc_snapshot(root, false);
1062 if (ret)
1063 goto out;
1064
1065 /*
1066 * All previous writes have started writeback in NOCOW mode, so now
1067 * we force future writes to fallback to COW mode during snapshot
1068 * creation.
1069 */
1070 atomic_inc(&root->snapshot_force_cow);
1071 snapshot_force_cow = true;
1072
1073 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
1074
1075 ret = btrfs_mksubvol(parent, idmap, name, namelen,
1076 root, readonly, inherit);
1077out:
1078 if (snapshot_force_cow)
1079 atomic_dec(&root->snapshot_force_cow);
1080 btrfs_drew_read_unlock(&root->snapshot_lock);
1081 return ret;
1082}
1083
1084/*
1085 * Try to start exclusive operation @type or cancel it if it's running.
1086 *
1087 * Return:
1088 * 0 - normal mode, newly claimed op started
1089 * >0 - normal mode, something else is running,
1090 * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space
1091 * ECANCELED - cancel mode, successful cancel
1092 * ENOTCONN - cancel mode, operation not running anymore
1093 */
1094static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info,
1095 enum btrfs_exclusive_operation type, bool cancel)
1096{
1097 if (!cancel) {
1098 /* Start normal op */
1099 if (!btrfs_exclop_start(fs_info, type))
1100 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1101 /* Exclusive operation is now claimed */
1102 return 0;
1103 }
1104
1105 /* Cancel running op */
1106 if (btrfs_exclop_start_try_lock(fs_info, type)) {
1107 /*
1108 * This blocks any exclop finish from setting it to NONE, so we
1109 * request cancellation. Either it runs and we will wait for it,
1110 * or it has finished and no waiting will happen.
1111 */
1112 atomic_inc(&fs_info->reloc_cancel_req);
1113 btrfs_exclop_start_unlock(fs_info);
1114
1115 if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags))
1116 wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING,
1117 TASK_INTERRUPTIBLE);
1118
1119 return -ECANCELED;
1120 }
1121
1122 /* Something else is running or none */
1123 return -ENOTCONN;
1124}
1125
1126static noinline int btrfs_ioctl_resize(struct file *file,
1127 void __user *arg)
1128{
1129 BTRFS_DEV_LOOKUP_ARGS(args);
1130 struct inode *inode = file_inode(file);
1131 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
1132 u64 new_size;
1133 u64 old_size;
1134 u64 devid = 1;
1135 struct btrfs_root *root = BTRFS_I(inode)->root;
1136 struct btrfs_ioctl_vol_args *vol_args;
1137 struct btrfs_trans_handle *trans;
1138 struct btrfs_device *device = NULL;
1139 char *sizestr;
1140 char *retptr;
1141 char *devstr = NULL;
1142 int ret = 0;
1143 int mod = 0;
1144 bool cancel;
1145
1146 if (!capable(CAP_SYS_ADMIN))
1147 return -EPERM;
1148
1149 ret = mnt_want_write_file(file);
1150 if (ret)
1151 return ret;
1152
1153 /*
1154 * Read the arguments before checking exclusivity to be able to
1155 * distinguish regular resize and cancel
1156 */
1157 vol_args = memdup_user(arg, sizeof(*vol_args));
1158 if (IS_ERR(vol_args)) {
1159 ret = PTR_ERR(vol_args);
1160 goto out_drop;
1161 }
1162 ret = btrfs_check_ioctl_vol_args_path(vol_args);
1163 if (ret < 0)
1164 goto out_free;
1165
1166 sizestr = vol_args->name;
1167 cancel = (strcmp("cancel", sizestr) == 0);
1168 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel);
1169 if (ret)
1170 goto out_free;
1171 /* Exclusive operation is now claimed */
1172
1173 devstr = strchr(sizestr, ':');
1174 if (devstr) {
1175 sizestr = devstr + 1;
1176 *devstr = '\0';
1177 devstr = vol_args->name;
1178 ret = kstrtoull(devstr, 10, &devid);
1179 if (ret)
1180 goto out_finish;
1181 if (!devid) {
1182 ret = -EINVAL;
1183 goto out_finish;
1184 }
1185 btrfs_info(fs_info, "resizing devid %llu", devid);
1186 }
1187
1188 args.devid = devid;
1189 device = btrfs_find_device(fs_info->fs_devices, &args);
1190 if (!device) {
1191 btrfs_info(fs_info, "resizer unable to find device %llu",
1192 devid);
1193 ret = -ENODEV;
1194 goto out_finish;
1195 }
1196
1197 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1198 btrfs_info(fs_info,
1199 "resizer unable to apply on readonly device %llu",
1200 devid);
1201 ret = -EPERM;
1202 goto out_finish;
1203 }
1204
1205 if (!strcmp(sizestr, "max"))
1206 new_size = bdev_nr_bytes(device->bdev);
1207 else {
1208 if (sizestr[0] == '-') {
1209 mod = -1;
1210 sizestr++;
1211 } else if (sizestr[0] == '+') {
1212 mod = 1;
1213 sizestr++;
1214 }
1215 new_size = memparse(sizestr, &retptr);
1216 if (*retptr != '\0' || new_size == 0) {
1217 ret = -EINVAL;
1218 goto out_finish;
1219 }
1220 }
1221
1222 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1223 ret = -EPERM;
1224 goto out_finish;
1225 }
1226
1227 old_size = btrfs_device_get_total_bytes(device);
1228
1229 if (mod < 0) {
1230 if (new_size > old_size) {
1231 ret = -EINVAL;
1232 goto out_finish;
1233 }
1234 new_size = old_size - new_size;
1235 } else if (mod > 0) {
1236 if (new_size > ULLONG_MAX - old_size) {
1237 ret = -ERANGE;
1238 goto out_finish;
1239 }
1240 new_size = old_size + new_size;
1241 }
1242
1243 if (new_size < SZ_256M) {
1244 ret = -EINVAL;
1245 goto out_finish;
1246 }
1247 if (new_size > bdev_nr_bytes(device->bdev)) {
1248 ret = -EFBIG;
1249 goto out_finish;
1250 }
1251
1252 new_size = round_down(new_size, fs_info->sectorsize);
1253
1254 if (new_size > old_size) {
1255 trans = btrfs_start_transaction(root, 0);
1256 if (IS_ERR(trans)) {
1257 ret = PTR_ERR(trans);
1258 goto out_finish;
1259 }
1260 ret = btrfs_grow_device(trans, device, new_size);
1261 btrfs_commit_transaction(trans);
1262 } else if (new_size < old_size) {
1263 ret = btrfs_shrink_device(device, new_size);
1264 } /* equal, nothing need to do */
1265
1266 if (ret == 0 && new_size != old_size)
1267 btrfs_info_in_rcu(fs_info,
1268 "resize device %s (devid %llu) from %llu to %llu",
1269 btrfs_dev_name(device), device->devid,
1270 old_size, new_size);
1271out_finish:
1272 btrfs_exclop_finish(fs_info);
1273out_free:
1274 kfree(vol_args);
1275out_drop:
1276 mnt_drop_write_file(file);
1277 return ret;
1278}
1279
1280static noinline int __btrfs_ioctl_snap_create(struct file *file,
1281 struct mnt_idmap *idmap,
1282 const char *name, unsigned long fd, int subvol,
1283 bool readonly,
1284 struct btrfs_qgroup_inherit *inherit)
1285{
1286 int namelen;
1287 int ret = 0;
1288
1289 if (!S_ISDIR(file_inode(file)->i_mode))
1290 return -ENOTDIR;
1291
1292 ret = mnt_want_write_file(file);
1293 if (ret)
1294 goto out;
1295
1296 namelen = strlen(name);
1297 if (strchr(name, '/')) {
1298 ret = -EINVAL;
1299 goto out_drop_write;
1300 }
1301
1302 if (name[0] == '.' &&
1303 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1304 ret = -EEXIST;
1305 goto out_drop_write;
1306 }
1307
1308 if (subvol) {
1309 ret = btrfs_mksubvol(&file->f_path, idmap, name,
1310 namelen, NULL, readonly, inherit);
1311 } else {
1312 struct fd src = fdget(fd);
1313 struct inode *src_inode;
1314 if (!src.file) {
1315 ret = -EINVAL;
1316 goto out_drop_write;
1317 }
1318
1319 src_inode = file_inode(src.file);
1320 if (src_inode->i_sb != file_inode(file)->i_sb) {
1321 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1322 "Snapshot src from another FS");
1323 ret = -EXDEV;
1324 } else if (!inode_owner_or_capable(idmap, src_inode)) {
1325 /*
1326 * Subvolume creation is not restricted, but snapshots
1327 * are limited to own subvolumes only
1328 */
1329 ret = -EPERM;
1330 } else if (btrfs_ino(BTRFS_I(src_inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1331 /*
1332 * Snapshots must be made with the src_inode referring
1333 * to the subvolume inode, otherwise the permission
1334 * checking above is useless because we may have
1335 * permission on a lower directory but not the subvol
1336 * itself.
1337 */
1338 ret = -EINVAL;
1339 } else {
1340 ret = btrfs_mksnapshot(&file->f_path, idmap,
1341 name, namelen,
1342 BTRFS_I(src_inode)->root,
1343 readonly, inherit);
1344 }
1345 fdput(src);
1346 }
1347out_drop_write:
1348 mnt_drop_write_file(file);
1349out:
1350 return ret;
1351}
1352
1353static noinline int btrfs_ioctl_snap_create(struct file *file,
1354 void __user *arg, int subvol)
1355{
1356 struct btrfs_ioctl_vol_args *vol_args;
1357 int ret;
1358
1359 if (!S_ISDIR(file_inode(file)->i_mode))
1360 return -ENOTDIR;
1361
1362 vol_args = memdup_user(arg, sizeof(*vol_args));
1363 if (IS_ERR(vol_args))
1364 return PTR_ERR(vol_args);
1365 ret = btrfs_check_ioctl_vol_args_path(vol_args);
1366 if (ret < 0)
1367 goto out;
1368
1369 ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file),
1370 vol_args->name, vol_args->fd, subvol,
1371 false, NULL);
1372
1373out:
1374 kfree(vol_args);
1375 return ret;
1376}
1377
1378static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1379 void __user *arg, int subvol)
1380{
1381 struct btrfs_ioctl_vol_args_v2 *vol_args;
1382 int ret;
1383 bool readonly = false;
1384 struct btrfs_qgroup_inherit *inherit = NULL;
1385
1386 if (!S_ISDIR(file_inode(file)->i_mode))
1387 return -ENOTDIR;
1388
1389 vol_args = memdup_user(arg, sizeof(*vol_args));
1390 if (IS_ERR(vol_args))
1391 return PTR_ERR(vol_args);
1392 ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args);
1393 if (ret < 0)
1394 goto free_args;
1395
1396 if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
1397 ret = -EOPNOTSUPP;
1398 goto free_args;
1399 }
1400
1401 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1402 readonly = true;
1403 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1404 struct btrfs_fs_info *fs_info = inode_to_fs_info(file_inode(file));
1405
1406 if (vol_args->size < sizeof(*inherit) ||
1407 vol_args->size > PAGE_SIZE) {
1408 ret = -EINVAL;
1409 goto free_args;
1410 }
1411 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1412 if (IS_ERR(inherit)) {
1413 ret = PTR_ERR(inherit);
1414 goto free_args;
1415 }
1416
1417 ret = btrfs_qgroup_check_inherit(fs_info, inherit, vol_args->size);
1418 if (ret < 0)
1419 goto free_inherit;
1420 }
1421
1422 ret = __btrfs_ioctl_snap_create(file, file_mnt_idmap(file),
1423 vol_args->name, vol_args->fd, subvol,
1424 readonly, inherit);
1425 if (ret)
1426 goto free_inherit;
1427free_inherit:
1428 kfree(inherit);
1429free_args:
1430 kfree(vol_args);
1431 return ret;
1432}
1433
1434static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode,
1435 void __user *arg)
1436{
1437 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
1438 struct btrfs_root *root = BTRFS_I(inode)->root;
1439 int ret = 0;
1440 u64 flags = 0;
1441
1442 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1443 return -EINVAL;
1444
1445 down_read(&fs_info->subvol_sem);
1446 if (btrfs_root_readonly(root))
1447 flags |= BTRFS_SUBVOL_RDONLY;
1448 up_read(&fs_info->subvol_sem);
1449
1450 if (copy_to_user(arg, &flags, sizeof(flags)))
1451 ret = -EFAULT;
1452
1453 return ret;
1454}
1455
1456static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1457 void __user *arg)
1458{
1459 struct inode *inode = file_inode(file);
1460 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
1461 struct btrfs_root *root = BTRFS_I(inode)->root;
1462 struct btrfs_trans_handle *trans;
1463 u64 root_flags;
1464 u64 flags;
1465 int ret = 0;
1466
1467 if (!inode_owner_or_capable(file_mnt_idmap(file), inode))
1468 return -EPERM;
1469
1470 ret = mnt_want_write_file(file);
1471 if (ret)
1472 goto out;
1473
1474 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1475 ret = -EINVAL;
1476 goto out_drop_write;
1477 }
1478
1479 if (copy_from_user(&flags, arg, sizeof(flags))) {
1480 ret = -EFAULT;
1481 goto out_drop_write;
1482 }
1483
1484 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1485 ret = -EOPNOTSUPP;
1486 goto out_drop_write;
1487 }
1488
1489 down_write(&fs_info->subvol_sem);
1490
1491 /* nothing to do */
1492 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1493 goto out_drop_sem;
1494
1495 root_flags = btrfs_root_flags(&root->root_item);
1496 if (flags & BTRFS_SUBVOL_RDONLY) {
1497 btrfs_set_root_flags(&root->root_item,
1498 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1499 } else {
1500 /*
1501 * Block RO -> RW transition if this subvolume is involved in
1502 * send
1503 */
1504 spin_lock(&root->root_item_lock);
1505 if (root->send_in_progress == 0) {
1506 btrfs_set_root_flags(&root->root_item,
1507 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1508 spin_unlock(&root->root_item_lock);
1509 } else {
1510 spin_unlock(&root->root_item_lock);
1511 btrfs_warn(fs_info,
1512 "Attempt to set subvolume %llu read-write during send",
1513 root->root_key.objectid);
1514 ret = -EPERM;
1515 goto out_drop_sem;
1516 }
1517 }
1518
1519 trans = btrfs_start_transaction(root, 1);
1520 if (IS_ERR(trans)) {
1521 ret = PTR_ERR(trans);
1522 goto out_reset;
1523 }
1524
1525 ret = btrfs_update_root(trans, fs_info->tree_root,
1526 &root->root_key, &root->root_item);
1527 if (ret < 0) {
1528 btrfs_end_transaction(trans);
1529 goto out_reset;
1530 }
1531
1532 ret = btrfs_commit_transaction(trans);
1533
1534out_reset:
1535 if (ret)
1536 btrfs_set_root_flags(&root->root_item, root_flags);
1537out_drop_sem:
1538 up_write(&fs_info->subvol_sem);
1539out_drop_write:
1540 mnt_drop_write_file(file);
1541out:
1542 return ret;
1543}
1544
1545static noinline int key_in_sk(struct btrfs_key *key,
1546 struct btrfs_ioctl_search_key *sk)
1547{
1548 struct btrfs_key test;
1549 int ret;
1550
1551 test.objectid = sk->min_objectid;
1552 test.type = sk->min_type;
1553 test.offset = sk->min_offset;
1554
1555 ret = btrfs_comp_cpu_keys(key, &test);
1556 if (ret < 0)
1557 return 0;
1558
1559 test.objectid = sk->max_objectid;
1560 test.type = sk->max_type;
1561 test.offset = sk->max_offset;
1562
1563 ret = btrfs_comp_cpu_keys(key, &test);
1564 if (ret > 0)
1565 return 0;
1566 return 1;
1567}
1568
1569static noinline int copy_to_sk(struct btrfs_path *path,
1570 struct btrfs_key *key,
1571 struct btrfs_ioctl_search_key *sk,
1572 u64 *buf_size,
1573 char __user *ubuf,
1574 unsigned long *sk_offset,
1575 int *num_found)
1576{
1577 u64 found_transid;
1578 struct extent_buffer *leaf;
1579 struct btrfs_ioctl_search_header sh;
1580 struct btrfs_key test;
1581 unsigned long item_off;
1582 unsigned long item_len;
1583 int nritems;
1584 int i;
1585 int slot;
1586 int ret = 0;
1587
1588 leaf = path->nodes[0];
1589 slot = path->slots[0];
1590 nritems = btrfs_header_nritems(leaf);
1591
1592 if (btrfs_header_generation(leaf) > sk->max_transid) {
1593 i = nritems;
1594 goto advance_key;
1595 }
1596 found_transid = btrfs_header_generation(leaf);
1597
1598 for (i = slot; i < nritems; i++) {
1599 item_off = btrfs_item_ptr_offset(leaf, i);
1600 item_len = btrfs_item_size(leaf, i);
1601
1602 btrfs_item_key_to_cpu(leaf, key, i);
1603 if (!key_in_sk(key, sk))
1604 continue;
1605
1606 if (sizeof(sh) + item_len > *buf_size) {
1607 if (*num_found) {
1608 ret = 1;
1609 goto out;
1610 }
1611
1612 /*
1613 * return one empty item back for v1, which does not
1614 * handle -EOVERFLOW
1615 */
1616
1617 *buf_size = sizeof(sh) + item_len;
1618 item_len = 0;
1619 ret = -EOVERFLOW;
1620 }
1621
1622 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1623 ret = 1;
1624 goto out;
1625 }
1626
1627 sh.objectid = key->objectid;
1628 sh.offset = key->offset;
1629 sh.type = key->type;
1630 sh.len = item_len;
1631 sh.transid = found_transid;
1632
1633 /*
1634 * Copy search result header. If we fault then loop again so we
1635 * can fault in the pages and -EFAULT there if there's a
1636 * problem. Otherwise we'll fault and then copy the buffer in
1637 * properly this next time through
1638 */
1639 if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
1640 ret = 0;
1641 goto out;
1642 }
1643
1644 *sk_offset += sizeof(sh);
1645
1646 if (item_len) {
1647 char __user *up = ubuf + *sk_offset;
1648 /*
1649 * Copy the item, same behavior as above, but reset the
1650 * * sk_offset so we copy the full thing again.
1651 */
1652 if (read_extent_buffer_to_user_nofault(leaf, up,
1653 item_off, item_len)) {
1654 ret = 0;
1655 *sk_offset -= sizeof(sh);
1656 goto out;
1657 }
1658
1659 *sk_offset += item_len;
1660 }
1661 (*num_found)++;
1662
1663 if (ret) /* -EOVERFLOW from above */
1664 goto out;
1665
1666 if (*num_found >= sk->nr_items) {
1667 ret = 1;
1668 goto out;
1669 }
1670 }
1671advance_key:
1672 ret = 0;
1673 test.objectid = sk->max_objectid;
1674 test.type = sk->max_type;
1675 test.offset = sk->max_offset;
1676 if (btrfs_comp_cpu_keys(key, &test) >= 0)
1677 ret = 1;
1678 else if (key->offset < (u64)-1)
1679 key->offset++;
1680 else if (key->type < (u8)-1) {
1681 key->offset = 0;
1682 key->type++;
1683 } else if (key->objectid < (u64)-1) {
1684 key->offset = 0;
1685 key->type = 0;
1686 key->objectid++;
1687 } else
1688 ret = 1;
1689out:
1690 /*
1691 * 0: all items from this leaf copied, continue with next
1692 * 1: * more items can be copied, but unused buffer is too small
1693 * * all items were found
1694 * Either way, it will stops the loop which iterates to the next
1695 * leaf
1696 * -EOVERFLOW: item was to large for buffer
1697 * -EFAULT: could not copy extent buffer back to userspace
1698 */
1699 return ret;
1700}
1701
1702static noinline int search_ioctl(struct inode *inode,
1703 struct btrfs_ioctl_search_key *sk,
1704 u64 *buf_size,
1705 char __user *ubuf)
1706{
1707 struct btrfs_fs_info *info = inode_to_fs_info(inode);
1708 struct btrfs_root *root;
1709 struct btrfs_key key;
1710 struct btrfs_path *path;
1711 int ret;
1712 int num_found = 0;
1713 unsigned long sk_offset = 0;
1714
1715 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
1716 *buf_size = sizeof(struct btrfs_ioctl_search_header);
1717 return -EOVERFLOW;
1718 }
1719
1720 path = btrfs_alloc_path();
1721 if (!path)
1722 return -ENOMEM;
1723
1724 if (sk->tree_id == 0) {
1725 /* search the root of the inode that was passed */
1726 root = btrfs_grab_root(BTRFS_I(inode)->root);
1727 } else {
1728 root = btrfs_get_fs_root(info, sk->tree_id, true);
1729 if (IS_ERR(root)) {
1730 btrfs_free_path(path);
1731 return PTR_ERR(root);
1732 }
1733 }
1734
1735 key.objectid = sk->min_objectid;
1736 key.type = sk->min_type;
1737 key.offset = sk->min_offset;
1738
1739 while (1) {
1740 ret = -EFAULT;
1741 /*
1742 * Ensure that the whole user buffer is faulted in at sub-page
1743 * granularity, otherwise the loop may live-lock.
1744 */
1745 if (fault_in_subpage_writeable(ubuf + sk_offset,
1746 *buf_size - sk_offset))
1747 break;
1748
1749 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
1750 if (ret != 0) {
1751 if (ret > 0)
1752 ret = 0;
1753 goto err;
1754 }
1755 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
1756 &sk_offset, &num_found);
1757 btrfs_release_path(path);
1758 if (ret)
1759 break;
1760
1761 }
1762 if (ret > 0)
1763 ret = 0;
1764err:
1765 sk->nr_items = num_found;
1766 btrfs_put_root(root);
1767 btrfs_free_path(path);
1768 return ret;
1769}
1770
1771static noinline int btrfs_ioctl_tree_search(struct inode *inode,
1772 void __user *argp)
1773{
1774 struct btrfs_ioctl_search_args __user *uargs = argp;
1775 struct btrfs_ioctl_search_key sk;
1776 int ret;
1777 u64 buf_size;
1778
1779 if (!capable(CAP_SYS_ADMIN))
1780 return -EPERM;
1781
1782 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
1783 return -EFAULT;
1784
1785 buf_size = sizeof(uargs->buf);
1786
1787 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
1788
1789 /*
1790 * In the origin implementation an overflow is handled by returning a
1791 * search header with a len of zero, so reset ret.
1792 */
1793 if (ret == -EOVERFLOW)
1794 ret = 0;
1795
1796 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
1797 ret = -EFAULT;
1798 return ret;
1799}
1800
1801static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode,
1802 void __user *argp)
1803{
1804 struct btrfs_ioctl_search_args_v2 __user *uarg = argp;
1805 struct btrfs_ioctl_search_args_v2 args;
1806 int ret;
1807 u64 buf_size;
1808 const u64 buf_limit = SZ_16M;
1809
1810 if (!capable(CAP_SYS_ADMIN))
1811 return -EPERM;
1812
1813 /* copy search header and buffer size */
1814 if (copy_from_user(&args, uarg, sizeof(args)))
1815 return -EFAULT;
1816
1817 buf_size = args.buf_size;
1818
1819 /* limit result size to 16MB */
1820 if (buf_size > buf_limit)
1821 buf_size = buf_limit;
1822
1823 ret = search_ioctl(inode, &args.key, &buf_size,
1824 (char __user *)(&uarg->buf[0]));
1825 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
1826 ret = -EFAULT;
1827 else if (ret == -EOVERFLOW &&
1828 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
1829 ret = -EFAULT;
1830
1831 return ret;
1832}
1833
1834/*
1835 * Search INODE_REFs to identify path name of 'dirid' directory
1836 * in a 'tree_id' tree. and sets path name to 'name'.
1837 */
1838static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1839 u64 tree_id, u64 dirid, char *name)
1840{
1841 struct btrfs_root *root;
1842 struct btrfs_key key;
1843 char *ptr;
1844 int ret = -1;
1845 int slot;
1846 int len;
1847 int total_len = 0;
1848 struct btrfs_inode_ref *iref;
1849 struct extent_buffer *l;
1850 struct btrfs_path *path;
1851
1852 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1853 name[0]='\0';
1854 return 0;
1855 }
1856
1857 path = btrfs_alloc_path();
1858 if (!path)
1859 return -ENOMEM;
1860
1861 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
1862
1863 root = btrfs_get_fs_root(info, tree_id, true);
1864 if (IS_ERR(root)) {
1865 ret = PTR_ERR(root);
1866 root = NULL;
1867 goto out;
1868 }
1869
1870 key.objectid = dirid;
1871 key.type = BTRFS_INODE_REF_KEY;
1872 key.offset = (u64)-1;
1873
1874 while (1) {
1875 ret = btrfs_search_backwards(root, &key, path);
1876 if (ret < 0)
1877 goto out;
1878 else if (ret > 0) {
1879 ret = -ENOENT;
1880 goto out;
1881 }
1882
1883 l = path->nodes[0];
1884 slot = path->slots[0];
1885
1886 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1887 len = btrfs_inode_ref_name_len(l, iref);
1888 ptr -= len + 1;
1889 total_len += len + 1;
1890 if (ptr < name) {
1891 ret = -ENAMETOOLONG;
1892 goto out;
1893 }
1894
1895 *(ptr + len) = '/';
1896 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
1897
1898 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1899 break;
1900
1901 btrfs_release_path(path);
1902 key.objectid = key.offset;
1903 key.offset = (u64)-1;
1904 dirid = key.objectid;
1905 }
1906 memmove(name, ptr, total_len);
1907 name[total_len] = '\0';
1908 ret = 0;
1909out:
1910 btrfs_put_root(root);
1911 btrfs_free_path(path);
1912 return ret;
1913}
1914
1915static int btrfs_search_path_in_tree_user(struct mnt_idmap *idmap,
1916 struct inode *inode,
1917 struct btrfs_ioctl_ino_lookup_user_args *args)
1918{
1919 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
1920 struct super_block *sb = inode->i_sb;
1921 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
1922 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
1923 u64 dirid = args->dirid;
1924 unsigned long item_off;
1925 unsigned long item_len;
1926 struct btrfs_inode_ref *iref;
1927 struct btrfs_root_ref *rref;
1928 struct btrfs_root *root = NULL;
1929 struct btrfs_path *path;
1930 struct btrfs_key key, key2;
1931 struct extent_buffer *leaf;
1932 struct inode *temp_inode;
1933 char *ptr;
1934 int slot;
1935 int len;
1936 int total_len = 0;
1937 int ret;
1938
1939 path = btrfs_alloc_path();
1940 if (!path)
1941 return -ENOMEM;
1942
1943 /*
1944 * If the bottom subvolume does not exist directly under upper_limit,
1945 * construct the path in from the bottom up.
1946 */
1947 if (dirid != upper_limit.objectid) {
1948 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
1949
1950 root = btrfs_get_fs_root(fs_info, treeid, true);
1951 if (IS_ERR(root)) {
1952 ret = PTR_ERR(root);
1953 goto out;
1954 }
1955
1956 key.objectid = dirid;
1957 key.type = BTRFS_INODE_REF_KEY;
1958 key.offset = (u64)-1;
1959 while (1) {
1960 ret = btrfs_search_backwards(root, &key, path);
1961 if (ret < 0)
1962 goto out_put;
1963 else if (ret > 0) {
1964 ret = -ENOENT;
1965 goto out_put;
1966 }
1967
1968 leaf = path->nodes[0];
1969 slot = path->slots[0];
1970
1971 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
1972 len = btrfs_inode_ref_name_len(leaf, iref);
1973 ptr -= len + 1;
1974 total_len += len + 1;
1975 if (ptr < args->path) {
1976 ret = -ENAMETOOLONG;
1977 goto out_put;
1978 }
1979
1980 *(ptr + len) = '/';
1981 read_extent_buffer(leaf, ptr,
1982 (unsigned long)(iref + 1), len);
1983
1984 /* Check the read+exec permission of this directory */
1985 ret = btrfs_previous_item(root, path, dirid,
1986 BTRFS_INODE_ITEM_KEY);
1987 if (ret < 0) {
1988 goto out_put;
1989 } else if (ret > 0) {
1990 ret = -ENOENT;
1991 goto out_put;
1992 }
1993
1994 leaf = path->nodes[0];
1995 slot = path->slots[0];
1996 btrfs_item_key_to_cpu(leaf, &key2, slot);
1997 if (key2.objectid != dirid) {
1998 ret = -ENOENT;
1999 goto out_put;
2000 }
2001
2002 /*
2003 * We don't need the path anymore, so release it and
2004 * avoid deadlocks and lockdep warnings in case
2005 * btrfs_iget() needs to lookup the inode from its root
2006 * btree and lock the same leaf.
2007 */
2008 btrfs_release_path(path);
2009 temp_inode = btrfs_iget(sb, key2.objectid, root);
2010 if (IS_ERR(temp_inode)) {
2011 ret = PTR_ERR(temp_inode);
2012 goto out_put;
2013 }
2014 ret = inode_permission(idmap, temp_inode,
2015 MAY_READ | MAY_EXEC);
2016 iput(temp_inode);
2017 if (ret) {
2018 ret = -EACCES;
2019 goto out_put;
2020 }
2021
2022 if (key.offset == upper_limit.objectid)
2023 break;
2024 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2025 ret = -EACCES;
2026 goto out_put;
2027 }
2028
2029 key.objectid = key.offset;
2030 key.offset = (u64)-1;
2031 dirid = key.objectid;
2032 }
2033
2034 memmove(args->path, ptr, total_len);
2035 args->path[total_len] = '\0';
2036 btrfs_put_root(root);
2037 root = NULL;
2038 btrfs_release_path(path);
2039 }
2040
2041 /* Get the bottom subvolume's name from ROOT_REF */
2042 key.objectid = treeid;
2043 key.type = BTRFS_ROOT_REF_KEY;
2044 key.offset = args->treeid;
2045 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2046 if (ret < 0) {
2047 goto out;
2048 } else if (ret > 0) {
2049 ret = -ENOENT;
2050 goto out;
2051 }
2052
2053 leaf = path->nodes[0];
2054 slot = path->slots[0];
2055 btrfs_item_key_to_cpu(leaf, &key, slot);
2056
2057 item_off = btrfs_item_ptr_offset(leaf, slot);
2058 item_len = btrfs_item_size(leaf, slot);
2059 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2060 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2061 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2062 ret = -EINVAL;
2063 goto out;
2064 }
2065
2066 /* Copy subvolume's name */
2067 item_off += sizeof(struct btrfs_root_ref);
2068 item_len -= sizeof(struct btrfs_root_ref);
2069 read_extent_buffer(leaf, args->name, item_off, item_len);
2070 args->name[item_len] = 0;
2071
2072out_put:
2073 btrfs_put_root(root);
2074out:
2075 btrfs_free_path(path);
2076 return ret;
2077}
2078
2079static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root,
2080 void __user *argp)
2081{
2082 struct btrfs_ioctl_ino_lookup_args *args;
2083 int ret = 0;
2084
2085 args = memdup_user(argp, sizeof(*args));
2086 if (IS_ERR(args))
2087 return PTR_ERR(args);
2088
2089 /*
2090 * Unprivileged query to obtain the containing subvolume root id. The
2091 * path is reset so it's consistent with btrfs_search_path_in_tree.
2092 */
2093 if (args->treeid == 0)
2094 args->treeid = root->root_key.objectid;
2095
2096 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2097 args->name[0] = 0;
2098 goto out;
2099 }
2100
2101 if (!capable(CAP_SYS_ADMIN)) {
2102 ret = -EPERM;
2103 goto out;
2104 }
2105
2106 ret = btrfs_search_path_in_tree(root->fs_info,
2107 args->treeid, args->objectid,
2108 args->name);
2109
2110out:
2111 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2112 ret = -EFAULT;
2113
2114 kfree(args);
2115 return ret;
2116}
2117
2118/*
2119 * Version of ino_lookup ioctl (unprivileged)
2120 *
2121 * The main differences from ino_lookup ioctl are:
2122 *
2123 * 1. Read + Exec permission will be checked using inode_permission() during
2124 * path construction. -EACCES will be returned in case of failure.
2125 * 2. Path construction will be stopped at the inode number which corresponds
2126 * to the fd with which this ioctl is called. If constructed path does not
2127 * exist under fd's inode, -EACCES will be returned.
2128 * 3. The name of bottom subvolume is also searched and filled.
2129 */
2130static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2131{
2132 struct btrfs_ioctl_ino_lookup_user_args *args;
2133 struct inode *inode;
2134 int ret;
2135
2136 args = memdup_user(argp, sizeof(*args));
2137 if (IS_ERR(args))
2138 return PTR_ERR(args);
2139
2140 inode = file_inode(file);
2141
2142 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2143 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2144 /*
2145 * The subvolume does not exist under fd with which this is
2146 * called
2147 */
2148 kfree(args);
2149 return -EACCES;
2150 }
2151
2152 ret = btrfs_search_path_in_tree_user(file_mnt_idmap(file), inode, args);
2153
2154 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2155 ret = -EFAULT;
2156
2157 kfree(args);
2158 return ret;
2159}
2160
2161/* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2162static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp)
2163{
2164 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2165 struct btrfs_fs_info *fs_info;
2166 struct btrfs_root *root;
2167 struct btrfs_path *path;
2168 struct btrfs_key key;
2169 struct btrfs_root_item *root_item;
2170 struct btrfs_root_ref *rref;
2171 struct extent_buffer *leaf;
2172 unsigned long item_off;
2173 unsigned long item_len;
2174 int slot;
2175 int ret = 0;
2176
2177 path = btrfs_alloc_path();
2178 if (!path)
2179 return -ENOMEM;
2180
2181 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2182 if (!subvol_info) {
2183 btrfs_free_path(path);
2184 return -ENOMEM;
2185 }
2186
2187 fs_info = BTRFS_I(inode)->root->fs_info;
2188
2189 /* Get root_item of inode's subvolume */
2190 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2191 root = btrfs_get_fs_root(fs_info, key.objectid, true);
2192 if (IS_ERR(root)) {
2193 ret = PTR_ERR(root);
2194 goto out_free;
2195 }
2196 root_item = &root->root_item;
2197
2198 subvol_info->treeid = key.objectid;
2199
2200 subvol_info->generation = btrfs_root_generation(root_item);
2201 subvol_info->flags = btrfs_root_flags(root_item);
2202
2203 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2204 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2205 BTRFS_UUID_SIZE);
2206 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2207 BTRFS_UUID_SIZE);
2208
2209 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2210 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2211 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2212
2213 subvol_info->otransid = btrfs_root_otransid(root_item);
2214 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2215 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2216
2217 subvol_info->stransid = btrfs_root_stransid(root_item);
2218 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2219 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2220
2221 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2222 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2223 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2224
2225 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2226 /* Search root tree for ROOT_BACKREF of this subvolume */
2227 key.type = BTRFS_ROOT_BACKREF_KEY;
2228 key.offset = 0;
2229 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2230 if (ret < 0) {
2231 goto out;
2232 } else if (path->slots[0] >=
2233 btrfs_header_nritems(path->nodes[0])) {
2234 ret = btrfs_next_leaf(fs_info->tree_root, path);
2235 if (ret < 0) {
2236 goto out;
2237 } else if (ret > 0) {
2238 ret = -EUCLEAN;
2239 goto out;
2240 }
2241 }
2242
2243 leaf = path->nodes[0];
2244 slot = path->slots[0];
2245 btrfs_item_key_to_cpu(leaf, &key, slot);
2246 if (key.objectid == subvol_info->treeid &&
2247 key.type == BTRFS_ROOT_BACKREF_KEY) {
2248 subvol_info->parent_id = key.offset;
2249
2250 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2251 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2252
2253 item_off = btrfs_item_ptr_offset(leaf, slot)
2254 + sizeof(struct btrfs_root_ref);
2255 item_len = btrfs_item_size(leaf, slot)
2256 - sizeof(struct btrfs_root_ref);
2257 read_extent_buffer(leaf, subvol_info->name,
2258 item_off, item_len);
2259 } else {
2260 ret = -ENOENT;
2261 goto out;
2262 }
2263 }
2264
2265 btrfs_free_path(path);
2266 path = NULL;
2267 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2268 ret = -EFAULT;
2269
2270out:
2271 btrfs_put_root(root);
2272out_free:
2273 btrfs_free_path(path);
2274 kfree(subvol_info);
2275 return ret;
2276}
2277
2278/*
2279 * Return ROOT_REF information of the subvolume containing this inode
2280 * except the subvolume name.
2281 */
2282static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root,
2283 void __user *argp)
2284{
2285 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2286 struct btrfs_root_ref *rref;
2287 struct btrfs_path *path;
2288 struct btrfs_key key;
2289 struct extent_buffer *leaf;
2290 u64 objectid;
2291 int slot;
2292 int ret;
2293 u8 found;
2294
2295 path = btrfs_alloc_path();
2296 if (!path)
2297 return -ENOMEM;
2298
2299 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2300 if (IS_ERR(rootrefs)) {
2301 btrfs_free_path(path);
2302 return PTR_ERR(rootrefs);
2303 }
2304
2305 objectid = root->root_key.objectid;
2306 key.objectid = objectid;
2307 key.type = BTRFS_ROOT_REF_KEY;
2308 key.offset = rootrefs->min_treeid;
2309 found = 0;
2310
2311 root = root->fs_info->tree_root;
2312 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2313 if (ret < 0) {
2314 goto out;
2315 } else if (path->slots[0] >=
2316 btrfs_header_nritems(path->nodes[0])) {
2317 ret = btrfs_next_leaf(root, path);
2318 if (ret < 0) {
2319 goto out;
2320 } else if (ret > 0) {
2321 ret = -EUCLEAN;
2322 goto out;
2323 }
2324 }
2325 while (1) {
2326 leaf = path->nodes[0];
2327 slot = path->slots[0];
2328
2329 btrfs_item_key_to_cpu(leaf, &key, slot);
2330 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2331 ret = 0;
2332 goto out;
2333 }
2334
2335 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2336 ret = -EOVERFLOW;
2337 goto out;
2338 }
2339
2340 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2341 rootrefs->rootref[found].treeid = key.offset;
2342 rootrefs->rootref[found].dirid =
2343 btrfs_root_ref_dirid(leaf, rref);
2344 found++;
2345
2346 ret = btrfs_next_item(root, path);
2347 if (ret < 0) {
2348 goto out;
2349 } else if (ret > 0) {
2350 ret = -EUCLEAN;
2351 goto out;
2352 }
2353 }
2354
2355out:
2356 btrfs_free_path(path);
2357
2358 if (!ret || ret == -EOVERFLOW) {
2359 rootrefs->num_items = found;
2360 /* update min_treeid for next search */
2361 if (found)
2362 rootrefs->min_treeid =
2363 rootrefs->rootref[found - 1].treeid + 1;
2364 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2365 ret = -EFAULT;
2366 }
2367
2368 kfree(rootrefs);
2369
2370 return ret;
2371}
2372
2373static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2374 void __user *arg,
2375 bool destroy_v2)
2376{
2377 struct dentry *parent = file->f_path.dentry;
2378 struct dentry *dentry;
2379 struct inode *dir = d_inode(parent);
2380 struct btrfs_fs_info *fs_info = inode_to_fs_info(dir);
2381 struct inode *inode;
2382 struct btrfs_root *root = BTRFS_I(dir)->root;
2383 struct btrfs_root *dest = NULL;
2384 struct btrfs_ioctl_vol_args *vol_args = NULL;
2385 struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
2386 struct mnt_idmap *idmap = file_mnt_idmap(file);
2387 char *subvol_name, *subvol_name_ptr = NULL;
2388 int subvol_namelen;
2389 int err = 0;
2390 bool destroy_parent = false;
2391
2392 /* We don't support snapshots with extent tree v2 yet. */
2393 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2394 btrfs_err(fs_info,
2395 "extent tree v2 doesn't support snapshot deletion yet");
2396 return -EOPNOTSUPP;
2397 }
2398
2399 if (destroy_v2) {
2400 vol_args2 = memdup_user(arg, sizeof(*vol_args2));
2401 if (IS_ERR(vol_args2))
2402 return PTR_ERR(vol_args2);
2403
2404 if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
2405 err = -EOPNOTSUPP;
2406 goto out;
2407 }
2408
2409 /*
2410 * If SPEC_BY_ID is not set, we are looking for the subvolume by
2411 * name, same as v1 currently does.
2412 */
2413 if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
2414 err = btrfs_check_ioctl_vol_args2_subvol_name(vol_args2);
2415 if (err < 0)
2416 goto out;
2417 subvol_name = vol_args2->name;
2418
2419 err = mnt_want_write_file(file);
2420 if (err)
2421 goto out;
2422 } else {
2423 struct inode *old_dir;
2424
2425 if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
2426 err = -EINVAL;
2427 goto out;
2428 }
2429
2430 err = mnt_want_write_file(file);
2431 if (err)
2432 goto out;
2433
2434 dentry = btrfs_get_dentry(fs_info->sb,
2435 BTRFS_FIRST_FREE_OBJECTID,
2436 vol_args2->subvolid, 0);
2437 if (IS_ERR(dentry)) {
2438 err = PTR_ERR(dentry);
2439 goto out_drop_write;
2440 }
2441
2442 /*
2443 * Change the default parent since the subvolume being
2444 * deleted can be outside of the current mount point.
2445 */
2446 parent = btrfs_get_parent(dentry);
2447
2448 /*
2449 * At this point dentry->d_name can point to '/' if the
2450 * subvolume we want to destroy is outsite of the
2451 * current mount point, so we need to release the
2452 * current dentry and execute the lookup to return a new
2453 * one with ->d_name pointing to the
2454 * <mount point>/subvol_name.
2455 */
2456 dput(dentry);
2457 if (IS_ERR(parent)) {
2458 err = PTR_ERR(parent);
2459 goto out_drop_write;
2460 }
2461 old_dir = dir;
2462 dir = d_inode(parent);
2463
2464 /*
2465 * If v2 was used with SPEC_BY_ID, a new parent was
2466 * allocated since the subvolume can be outside of the
2467 * current mount point. Later on we need to release this
2468 * new parent dentry.
2469 */
2470 destroy_parent = true;
2471
2472 /*
2473 * On idmapped mounts, deletion via subvolid is
2474 * restricted to subvolumes that are immediate
2475 * ancestors of the inode referenced by the file
2476 * descriptor in the ioctl. Otherwise the idmapping
2477 * could potentially be abused to delete subvolumes
2478 * anywhere in the filesystem the user wouldn't be able
2479 * to delete without an idmapped mount.
2480 */
2481 if (old_dir != dir && idmap != &nop_mnt_idmap) {
2482 err = -EOPNOTSUPP;
2483 goto free_parent;
2484 }
2485
2486 subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
2487 fs_info, vol_args2->subvolid);
2488 if (IS_ERR(subvol_name_ptr)) {
2489 err = PTR_ERR(subvol_name_ptr);
2490 goto free_parent;
2491 }
2492 /* subvol_name_ptr is already nul terminated */
2493 subvol_name = (char *)kbasename(subvol_name_ptr);
2494 }
2495 } else {
2496 vol_args = memdup_user(arg, sizeof(*vol_args));
2497 if (IS_ERR(vol_args))
2498 return PTR_ERR(vol_args);
2499
2500 err = btrfs_check_ioctl_vol_args_path(vol_args);
2501 if (err < 0)
2502 goto out;
2503
2504 subvol_name = vol_args->name;
2505
2506 err = mnt_want_write_file(file);
2507 if (err)
2508 goto out;
2509 }
2510
2511 subvol_namelen = strlen(subvol_name);
2512
2513 if (strchr(subvol_name, '/') ||
2514 strncmp(subvol_name, "..", subvol_namelen) == 0) {
2515 err = -EINVAL;
2516 goto free_subvol_name;
2517 }
2518
2519 if (!S_ISDIR(dir->i_mode)) {
2520 err = -ENOTDIR;
2521 goto free_subvol_name;
2522 }
2523
2524 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2525 if (err == -EINTR)
2526 goto free_subvol_name;
2527 dentry = lookup_one(idmap, subvol_name, parent, subvol_namelen);
2528 if (IS_ERR(dentry)) {
2529 err = PTR_ERR(dentry);
2530 goto out_unlock_dir;
2531 }
2532
2533 if (d_really_is_negative(dentry)) {
2534 err = -ENOENT;
2535 goto out_dput;
2536 }
2537
2538 inode = d_inode(dentry);
2539 dest = BTRFS_I(inode)->root;
2540 if (!capable(CAP_SYS_ADMIN)) {
2541 /*
2542 * Regular user. Only allow this with a special mount
2543 * option, when the user has write+exec access to the
2544 * subvol root, and when rmdir(2) would have been
2545 * allowed.
2546 *
2547 * Note that this is _not_ check that the subvol is
2548 * empty or doesn't contain data that we wouldn't
2549 * otherwise be able to delete.
2550 *
2551 * Users who want to delete empty subvols should try
2552 * rmdir(2).
2553 */
2554 err = -EPERM;
2555 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2556 goto out_dput;
2557
2558 /*
2559 * Do not allow deletion if the parent dir is the same
2560 * as the dir to be deleted. That means the ioctl
2561 * must be called on the dentry referencing the root
2562 * of the subvol, not a random directory contained
2563 * within it.
2564 */
2565 err = -EINVAL;
2566 if (root == dest)
2567 goto out_dput;
2568
2569 err = inode_permission(idmap, inode, MAY_WRITE | MAY_EXEC);
2570 if (err)
2571 goto out_dput;
2572 }
2573
2574 /* check if subvolume may be deleted by a user */
2575 err = btrfs_may_delete(idmap, dir, dentry, 1);
2576 if (err)
2577 goto out_dput;
2578
2579 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2580 err = -EINVAL;
2581 goto out_dput;
2582 }
2583
2584 btrfs_inode_lock(BTRFS_I(inode), 0);
2585 err = btrfs_delete_subvolume(BTRFS_I(dir), dentry);
2586 btrfs_inode_unlock(BTRFS_I(inode), 0);
2587 if (!err)
2588 d_delete_notify(dir, dentry);
2589
2590out_dput:
2591 dput(dentry);
2592out_unlock_dir:
2593 btrfs_inode_unlock(BTRFS_I(dir), 0);
2594free_subvol_name:
2595 kfree(subvol_name_ptr);
2596free_parent:
2597 if (destroy_parent)
2598 dput(parent);
2599out_drop_write:
2600 mnt_drop_write_file(file);
2601out:
2602 kfree(vol_args2);
2603 kfree(vol_args);
2604 return err;
2605}
2606
2607static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2608{
2609 struct inode *inode = file_inode(file);
2610 struct btrfs_root *root = BTRFS_I(inode)->root;
2611 struct btrfs_ioctl_defrag_range_args range = {0};
2612 int ret;
2613
2614 ret = mnt_want_write_file(file);
2615 if (ret)
2616 return ret;
2617
2618 if (btrfs_root_readonly(root)) {
2619 ret = -EROFS;
2620 goto out;
2621 }
2622
2623 switch (inode->i_mode & S_IFMT) {
2624 case S_IFDIR:
2625 if (!capable(CAP_SYS_ADMIN)) {
2626 ret = -EPERM;
2627 goto out;
2628 }
2629 ret = btrfs_defrag_root(root);
2630 break;
2631 case S_IFREG:
2632 /*
2633 * Note that this does not check the file descriptor for write
2634 * access. This prevents defragmenting executables that are
2635 * running and allows defrag on files open in read-only mode.
2636 */
2637 if (!capable(CAP_SYS_ADMIN) &&
2638 inode_permission(&nop_mnt_idmap, inode, MAY_WRITE)) {
2639 ret = -EPERM;
2640 goto out;
2641 }
2642
2643 if (argp) {
2644 if (copy_from_user(&range, argp, sizeof(range))) {
2645 ret = -EFAULT;
2646 goto out;
2647 }
2648 if (range.flags & ~BTRFS_DEFRAG_RANGE_FLAGS_SUPP) {
2649 ret = -EOPNOTSUPP;
2650 goto out;
2651 }
2652 /* compression requires us to start the IO */
2653 if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2654 range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
2655 range.extent_thresh = (u32)-1;
2656 }
2657 } else {
2658 /* the rest are all set to zero by kzalloc */
2659 range.len = (u64)-1;
2660 }
2661 ret = btrfs_defrag_file(file_inode(file), &file->f_ra,
2662 &range, BTRFS_OLDEST_GENERATION, 0);
2663 if (ret > 0)
2664 ret = 0;
2665 break;
2666 default:
2667 ret = -EINVAL;
2668 }
2669out:
2670 mnt_drop_write_file(file);
2671 return ret;
2672}
2673
2674static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
2675{
2676 struct btrfs_ioctl_vol_args *vol_args;
2677 bool restore_op = false;
2678 int ret;
2679
2680 if (!capable(CAP_SYS_ADMIN))
2681 return -EPERM;
2682
2683 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2684 btrfs_err(fs_info, "device add not supported on extent tree v2 yet");
2685 return -EINVAL;
2686 }
2687
2688 if (fs_info->fs_devices->temp_fsid) {
2689 btrfs_err(fs_info,
2690 "device add not supported on cloned temp-fsid mount");
2691 return -EINVAL;
2692 }
2693
2694 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) {
2695 if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD))
2696 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2697
2698 /*
2699 * We can do the device add because we have a paused balanced,
2700 * change the exclusive op type and remember we should bring
2701 * back the paused balance
2702 */
2703 fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD;
2704 btrfs_exclop_start_unlock(fs_info);
2705 restore_op = true;
2706 }
2707
2708 vol_args = memdup_user(arg, sizeof(*vol_args));
2709 if (IS_ERR(vol_args)) {
2710 ret = PTR_ERR(vol_args);
2711 goto out;
2712 }
2713
2714 ret = btrfs_check_ioctl_vol_args_path(vol_args);
2715 if (ret < 0)
2716 goto out_free;
2717
2718 ret = btrfs_init_new_device(fs_info, vol_args->name);
2719
2720 if (!ret)
2721 btrfs_info(fs_info, "disk added %s", vol_args->name);
2722
2723out_free:
2724 kfree(vol_args);
2725out:
2726 if (restore_op)
2727 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);
2728 else
2729 btrfs_exclop_finish(fs_info);
2730 return ret;
2731}
2732
2733static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
2734{
2735 BTRFS_DEV_LOOKUP_ARGS(args);
2736 struct inode *inode = file_inode(file);
2737 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
2738 struct btrfs_ioctl_vol_args_v2 *vol_args;
2739 struct file *bdev_file = NULL;
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 if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
2751 ret = -EOPNOTSUPP;
2752 goto out;
2753 }
2754
2755 ret = btrfs_check_ioctl_vol_args2_subvol_name(vol_args);
2756 if (ret < 0)
2757 goto out;
2758
2759 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
2760 args.devid = vol_args->devid;
2761 } else if (!strcmp("cancel", vol_args->name)) {
2762 cancel = true;
2763 } else {
2764 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2765 if (ret)
2766 goto out;
2767 }
2768
2769 ret = mnt_want_write_file(file);
2770 if (ret)
2771 goto out;
2772
2773 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2774 cancel);
2775 if (ret)
2776 goto err_drop;
2777
2778 /* Exclusive operation is now claimed */
2779 ret = btrfs_rm_device(fs_info, &args, &bdev_file);
2780
2781 btrfs_exclop_finish(fs_info);
2782
2783 if (!ret) {
2784 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
2785 btrfs_info(fs_info, "device deleted: id %llu",
2786 vol_args->devid);
2787 else
2788 btrfs_info(fs_info, "device deleted: %s",
2789 vol_args->name);
2790 }
2791err_drop:
2792 mnt_drop_write_file(file);
2793 if (bdev_file)
2794 fput(bdev_file);
2795out:
2796 btrfs_put_dev_args_from_path(&args);
2797 kfree(vol_args);
2798 return ret;
2799}
2800
2801static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2802{
2803 BTRFS_DEV_LOOKUP_ARGS(args);
2804 struct inode *inode = file_inode(file);
2805 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
2806 struct btrfs_ioctl_vol_args *vol_args;
2807 struct file *bdev_file = NULL;
2808 int ret;
2809 bool cancel = false;
2810
2811 if (!capable(CAP_SYS_ADMIN))
2812 return -EPERM;
2813
2814 vol_args = memdup_user(arg, sizeof(*vol_args));
2815 if (IS_ERR(vol_args))
2816 return PTR_ERR(vol_args);
2817
2818 ret = btrfs_check_ioctl_vol_args_path(vol_args);
2819 if (ret < 0)
2820 goto out_free;
2821
2822 if (!strcmp("cancel", vol_args->name)) {
2823 cancel = true;
2824 } else {
2825 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
2826 if (ret)
2827 goto out;
2828 }
2829
2830 ret = mnt_want_write_file(file);
2831 if (ret)
2832 goto out;
2833
2834 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
2835 cancel);
2836 if (ret == 0) {
2837 ret = btrfs_rm_device(fs_info, &args, &bdev_file);
2838 if (!ret)
2839 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
2840 btrfs_exclop_finish(fs_info);
2841 }
2842
2843 mnt_drop_write_file(file);
2844 if (bdev_file)
2845 fput(bdev_file);
2846out:
2847 btrfs_put_dev_args_from_path(&args);
2848out_free:
2849 kfree(vol_args);
2850 return ret;
2851}
2852
2853static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
2854 void __user *arg)
2855{
2856 struct btrfs_ioctl_fs_info_args *fi_args;
2857 struct btrfs_device *device;
2858 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2859 u64 flags_in;
2860 int ret = 0;
2861
2862 fi_args = memdup_user(arg, sizeof(*fi_args));
2863 if (IS_ERR(fi_args))
2864 return PTR_ERR(fi_args);
2865
2866 flags_in = fi_args->flags;
2867 memset(fi_args, 0, sizeof(*fi_args));
2868
2869 rcu_read_lock();
2870 fi_args->num_devices = fs_devices->num_devices;
2871
2872 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
2873 if (device->devid > fi_args->max_id)
2874 fi_args->max_id = device->devid;
2875 }
2876 rcu_read_unlock();
2877
2878 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
2879 fi_args->nodesize = fs_info->nodesize;
2880 fi_args->sectorsize = fs_info->sectorsize;
2881 fi_args->clone_alignment = fs_info->sectorsize;
2882
2883 if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
2884 fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
2885 fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
2886 fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
2887 }
2888
2889 if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
2890 fi_args->generation = btrfs_get_fs_generation(fs_info);
2891 fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
2892 }
2893
2894 if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
2895 memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
2896 sizeof(fi_args->metadata_uuid));
2897 fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
2898 }
2899
2900 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2901 ret = -EFAULT;
2902
2903 kfree(fi_args);
2904 return ret;
2905}
2906
2907static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
2908 void __user *arg)
2909{
2910 BTRFS_DEV_LOOKUP_ARGS(args);
2911 struct btrfs_ioctl_dev_info_args *di_args;
2912 struct btrfs_device *dev;
2913 int ret = 0;
2914
2915 di_args = memdup_user(arg, sizeof(*di_args));
2916 if (IS_ERR(di_args))
2917 return PTR_ERR(di_args);
2918
2919 args.devid = di_args->devid;
2920 if (!btrfs_is_empty_uuid(di_args->uuid))
2921 args.uuid = di_args->uuid;
2922
2923 rcu_read_lock();
2924 dev = btrfs_find_device(fs_info->fs_devices, &args);
2925 if (!dev) {
2926 ret = -ENODEV;
2927 goto out;
2928 }
2929
2930 di_args->devid = dev->devid;
2931 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2932 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
2933 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2934 memcpy(di_args->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
2935 if (dev->name)
2936 strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path));
2937 else
2938 di_args->path[0] = '\0';
2939
2940out:
2941 rcu_read_unlock();
2942 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2943 ret = -EFAULT;
2944
2945 kfree(di_args);
2946 return ret;
2947}
2948
2949static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2950{
2951 struct inode *inode = file_inode(file);
2952 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
2953 struct btrfs_root *root = BTRFS_I(inode)->root;
2954 struct btrfs_root *new_root;
2955 struct btrfs_dir_item *di;
2956 struct btrfs_trans_handle *trans;
2957 struct btrfs_path *path = NULL;
2958 struct btrfs_disk_key disk_key;
2959 struct fscrypt_str name = FSTR_INIT("default", 7);
2960 u64 objectid = 0;
2961 u64 dir_id;
2962 int ret;
2963
2964 if (!capable(CAP_SYS_ADMIN))
2965 return -EPERM;
2966
2967 ret = mnt_want_write_file(file);
2968 if (ret)
2969 return ret;
2970
2971 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2972 ret = -EFAULT;
2973 goto out;
2974 }
2975
2976 if (!objectid)
2977 objectid = BTRFS_FS_TREE_OBJECTID;
2978
2979 new_root = btrfs_get_fs_root(fs_info, objectid, true);
2980 if (IS_ERR(new_root)) {
2981 ret = PTR_ERR(new_root);
2982 goto out;
2983 }
2984 if (!is_fstree(new_root->root_key.objectid)) {
2985 ret = -ENOENT;
2986 goto out_free;
2987 }
2988
2989 path = btrfs_alloc_path();
2990 if (!path) {
2991 ret = -ENOMEM;
2992 goto out_free;
2993 }
2994
2995 trans = btrfs_start_transaction(root, 1);
2996 if (IS_ERR(trans)) {
2997 ret = PTR_ERR(trans);
2998 goto out_free;
2999 }
3000
3001 dir_id = btrfs_super_root_dir(fs_info->super_copy);
3002 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
3003 dir_id, &name, 1);
3004 if (IS_ERR_OR_NULL(di)) {
3005 btrfs_release_path(path);
3006 btrfs_end_transaction(trans);
3007 btrfs_err(fs_info,
3008 "Umm, you don't have the default diritem, this isn't going to work");
3009 ret = -ENOENT;
3010 goto out_free;
3011 }
3012
3013 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3014 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3015 btrfs_mark_buffer_dirty(trans, path->nodes[0]);
3016 btrfs_release_path(path);
3017
3018 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
3019 btrfs_end_transaction(trans);
3020out_free:
3021 btrfs_put_root(new_root);
3022 btrfs_free_path(path);
3023out:
3024 mnt_drop_write_file(file);
3025 return ret;
3026}
3027
3028static void get_block_group_info(struct list_head *groups_list,
3029 struct btrfs_ioctl_space_info *space)
3030{
3031 struct btrfs_block_group *block_group;
3032
3033 space->total_bytes = 0;
3034 space->used_bytes = 0;
3035 space->flags = 0;
3036 list_for_each_entry(block_group, groups_list, list) {
3037 space->flags = block_group->flags;
3038 space->total_bytes += block_group->length;
3039 space->used_bytes += block_group->used;
3040 }
3041}
3042
3043static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
3044 void __user *arg)
3045{
3046 struct btrfs_ioctl_space_args space_args = { 0 };
3047 struct btrfs_ioctl_space_info space;
3048 struct btrfs_ioctl_space_info *dest;
3049 struct btrfs_ioctl_space_info *dest_orig;
3050 struct btrfs_ioctl_space_info __user *user_dest;
3051 struct btrfs_space_info *info;
3052 static const u64 types[] = {
3053 BTRFS_BLOCK_GROUP_DATA,
3054 BTRFS_BLOCK_GROUP_SYSTEM,
3055 BTRFS_BLOCK_GROUP_METADATA,
3056 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
3057 };
3058 int num_types = 4;
3059 int alloc_size;
3060 int ret = 0;
3061 u64 slot_count = 0;
3062 int i, c;
3063
3064 if (copy_from_user(&space_args,
3065 (struct btrfs_ioctl_space_args __user *)arg,
3066 sizeof(space_args)))
3067 return -EFAULT;
3068
3069 for (i = 0; i < num_types; i++) {
3070 struct btrfs_space_info *tmp;
3071
3072 info = NULL;
3073 list_for_each_entry(tmp, &fs_info->space_info, list) {
3074 if (tmp->flags == types[i]) {
3075 info = tmp;
3076 break;
3077 }
3078 }
3079
3080 if (!info)
3081 continue;
3082
3083 down_read(&info->groups_sem);
3084 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3085 if (!list_empty(&info->block_groups[c]))
3086 slot_count++;
3087 }
3088 up_read(&info->groups_sem);
3089 }
3090
3091 /*
3092 * Global block reserve, exported as a space_info
3093 */
3094 slot_count++;
3095
3096 /* space_slots == 0 means they are asking for a count */
3097 if (space_args.space_slots == 0) {
3098 space_args.total_spaces = slot_count;
3099 goto out;
3100 }
3101
3102 slot_count = min_t(u64, space_args.space_slots, slot_count);
3103
3104 alloc_size = sizeof(*dest) * slot_count;
3105
3106 /* we generally have at most 6 or so space infos, one for each raid
3107 * level. So, a whole page should be more than enough for everyone
3108 */
3109 if (alloc_size > PAGE_SIZE)
3110 return -ENOMEM;
3111
3112 space_args.total_spaces = 0;
3113 dest = kmalloc(alloc_size, GFP_KERNEL);
3114 if (!dest)
3115 return -ENOMEM;
3116 dest_orig = dest;
3117
3118 /* now we have a buffer to copy into */
3119 for (i = 0; i < num_types; i++) {
3120 struct btrfs_space_info *tmp;
3121
3122 if (!slot_count)
3123 break;
3124
3125 info = NULL;
3126 list_for_each_entry(tmp, &fs_info->space_info, list) {
3127 if (tmp->flags == types[i]) {
3128 info = tmp;
3129 break;
3130 }
3131 }
3132
3133 if (!info)
3134 continue;
3135 down_read(&info->groups_sem);
3136 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3137 if (!list_empty(&info->block_groups[c])) {
3138 get_block_group_info(&info->block_groups[c],
3139 &space);
3140 memcpy(dest, &space, sizeof(space));
3141 dest++;
3142 space_args.total_spaces++;
3143 slot_count--;
3144 }
3145 if (!slot_count)
3146 break;
3147 }
3148 up_read(&info->groups_sem);
3149 }
3150
3151 /*
3152 * Add global block reserve
3153 */
3154 if (slot_count) {
3155 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
3156
3157 spin_lock(&block_rsv->lock);
3158 space.total_bytes = block_rsv->size;
3159 space.used_bytes = block_rsv->size - block_rsv->reserved;
3160 spin_unlock(&block_rsv->lock);
3161 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3162 memcpy(dest, &space, sizeof(space));
3163 space_args.total_spaces++;
3164 }
3165
3166 user_dest = (struct btrfs_ioctl_space_info __user *)
3167 (arg + sizeof(struct btrfs_ioctl_space_args));
3168
3169 if (copy_to_user(user_dest, dest_orig, alloc_size))
3170 ret = -EFAULT;
3171
3172 kfree(dest_orig);
3173out:
3174 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3175 ret = -EFAULT;
3176
3177 return ret;
3178}
3179
3180static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3181 void __user *argp)
3182{
3183 struct btrfs_trans_handle *trans;
3184 u64 transid;
3185
3186 /*
3187 * Start orphan cleanup here for the given root in case it hasn't been
3188 * started already by other means. Errors are handled in the other
3189 * functions during transaction commit.
3190 */
3191 btrfs_orphan_cleanup(root);
3192
3193 trans = btrfs_attach_transaction_barrier(root);
3194 if (IS_ERR(trans)) {
3195 if (PTR_ERR(trans) != -ENOENT)
3196 return PTR_ERR(trans);
3197
3198 /* No running transaction, don't bother */
3199 transid = btrfs_get_last_trans_committed(root->fs_info);
3200 goto out;
3201 }
3202 transid = trans->transid;
3203 btrfs_commit_transaction_async(trans);
3204out:
3205 if (argp)
3206 if (copy_to_user(argp, &transid, sizeof(transid)))
3207 return -EFAULT;
3208 return 0;
3209}
3210
3211static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
3212 void __user *argp)
3213{
3214 /* By default wait for the current transaction. */
3215 u64 transid = 0;
3216
3217 if (argp)
3218 if (copy_from_user(&transid, argp, sizeof(transid)))
3219 return -EFAULT;
3220
3221 return btrfs_wait_for_commit(fs_info, transid);
3222}
3223
3224static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3225{
3226 struct btrfs_fs_info *fs_info = inode_to_fs_info(file_inode(file));
3227 struct btrfs_ioctl_scrub_args *sa;
3228 int ret;
3229
3230 if (!capable(CAP_SYS_ADMIN))
3231 return -EPERM;
3232
3233 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3234 btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet");
3235 return -EINVAL;
3236 }
3237
3238 sa = memdup_user(arg, sizeof(*sa));
3239 if (IS_ERR(sa))
3240 return PTR_ERR(sa);
3241
3242 if (sa->flags & ~BTRFS_SCRUB_SUPPORTED_FLAGS) {
3243 ret = -EOPNOTSUPP;
3244 goto out;
3245 }
3246
3247 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3248 ret = mnt_want_write_file(file);
3249 if (ret)
3250 goto out;
3251 }
3252
3253 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
3254 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3255 0);
3256
3257 /*
3258 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
3259 * error. This is important as it allows user space to know how much
3260 * progress scrub has done. For example, if scrub is canceled we get
3261 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
3262 * space. Later user space can inspect the progress from the structure
3263 * btrfs_ioctl_scrub_args and resume scrub from where it left off
3264 * previously (btrfs-progs does this).
3265 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
3266 * then return -EFAULT to signal the structure was not copied or it may
3267 * be corrupt and unreliable due to a partial copy.
3268 */
3269 if (copy_to_user(arg, sa, sizeof(*sa)))
3270 ret = -EFAULT;
3271
3272 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3273 mnt_drop_write_file(file);
3274out:
3275 kfree(sa);
3276 return ret;
3277}
3278
3279static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
3280{
3281 if (!capable(CAP_SYS_ADMIN))
3282 return -EPERM;
3283
3284 return btrfs_scrub_cancel(fs_info);
3285}
3286
3287static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
3288 void __user *arg)
3289{
3290 struct btrfs_ioctl_scrub_args *sa;
3291 int ret;
3292
3293 if (!capable(CAP_SYS_ADMIN))
3294 return -EPERM;
3295
3296 sa = memdup_user(arg, sizeof(*sa));
3297 if (IS_ERR(sa))
3298 return PTR_ERR(sa);
3299
3300 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
3301
3302 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3303 ret = -EFAULT;
3304
3305 kfree(sa);
3306 return ret;
3307}
3308
3309static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
3310 void __user *arg)
3311{
3312 struct btrfs_ioctl_get_dev_stats *sa;
3313 int ret;
3314
3315 sa = memdup_user(arg, sizeof(*sa));
3316 if (IS_ERR(sa))
3317 return PTR_ERR(sa);
3318
3319 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3320 kfree(sa);
3321 return -EPERM;
3322 }
3323
3324 ret = btrfs_get_dev_stats(fs_info, sa);
3325
3326 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3327 ret = -EFAULT;
3328
3329 kfree(sa);
3330 return ret;
3331}
3332
3333static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
3334 void __user *arg)
3335{
3336 struct btrfs_ioctl_dev_replace_args *p;
3337 int ret;
3338
3339 if (!capable(CAP_SYS_ADMIN))
3340 return -EPERM;
3341
3342 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3343 btrfs_err(fs_info, "device replace not supported on extent tree v2 yet");
3344 return -EINVAL;
3345 }
3346
3347 p = memdup_user(arg, sizeof(*p));
3348 if (IS_ERR(p))
3349 return PTR_ERR(p);
3350
3351 switch (p->cmd) {
3352 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3353 if (sb_rdonly(fs_info->sb)) {
3354 ret = -EROFS;
3355 goto out;
3356 }
3357 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
3358 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3359 } else {
3360 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
3361 btrfs_exclop_finish(fs_info);
3362 }
3363 break;
3364 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3365 btrfs_dev_replace_status(fs_info, p);
3366 ret = 0;
3367 break;
3368 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3369 p->result = btrfs_dev_replace_cancel(fs_info);
3370 ret = 0;
3371 break;
3372 default:
3373 ret = -EINVAL;
3374 break;
3375 }
3376
3377 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3378 ret = -EFAULT;
3379out:
3380 kfree(p);
3381 return ret;
3382}
3383
3384static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3385{
3386 int ret = 0;
3387 int i;
3388 u64 rel_ptr;
3389 int size;
3390 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3391 struct inode_fs_paths *ipath = NULL;
3392 struct btrfs_path *path;
3393
3394 if (!capable(CAP_DAC_READ_SEARCH))
3395 return -EPERM;
3396
3397 path = btrfs_alloc_path();
3398 if (!path) {
3399 ret = -ENOMEM;
3400 goto out;
3401 }
3402
3403 ipa = memdup_user(arg, sizeof(*ipa));
3404 if (IS_ERR(ipa)) {
3405 ret = PTR_ERR(ipa);
3406 ipa = NULL;
3407 goto out;
3408 }
3409
3410 size = min_t(u32, ipa->size, 4096);
3411 ipath = init_ipath(size, root, path);
3412 if (IS_ERR(ipath)) {
3413 ret = PTR_ERR(ipath);
3414 ipath = NULL;
3415 goto out;
3416 }
3417
3418 ret = paths_from_inode(ipa->inum, ipath);
3419 if (ret < 0)
3420 goto out;
3421
3422 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3423 rel_ptr = ipath->fspath->val[i] -
3424 (u64)(unsigned long)ipath->fspath->val;
3425 ipath->fspath->val[i] = rel_ptr;
3426 }
3427
3428 btrfs_free_path(path);
3429 path = NULL;
3430 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
3431 ipath->fspath, size);
3432 if (ret) {
3433 ret = -EFAULT;
3434 goto out;
3435 }
3436
3437out:
3438 btrfs_free_path(path);
3439 free_ipath(ipath);
3440 kfree(ipa);
3441
3442 return ret;
3443}
3444
3445static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
3446 void __user *arg, int version)
3447{
3448 int ret = 0;
3449 int size;
3450 struct btrfs_ioctl_logical_ino_args *loi;
3451 struct btrfs_data_container *inodes = NULL;
3452 struct btrfs_path *path = NULL;
3453 bool ignore_offset;
3454
3455 if (!capable(CAP_SYS_ADMIN))
3456 return -EPERM;
3457
3458 loi = memdup_user(arg, sizeof(*loi));
3459 if (IS_ERR(loi))
3460 return PTR_ERR(loi);
3461
3462 if (version == 1) {
3463 ignore_offset = false;
3464 size = min_t(u32, loi->size, SZ_64K);
3465 } else {
3466 /* All reserved bits must be 0 for now */
3467 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
3468 ret = -EINVAL;
3469 goto out_loi;
3470 }
3471 /* Only accept flags we have defined so far */
3472 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
3473 ret = -EINVAL;
3474 goto out_loi;
3475 }
3476 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
3477 size = min_t(u32, loi->size, SZ_16M);
3478 }
3479
3480 inodes = init_data_container(size);
3481 if (IS_ERR(inodes)) {
3482 ret = PTR_ERR(inodes);
3483 goto out_loi;
3484 }
3485
3486 path = btrfs_alloc_path();
3487 if (!path) {
3488 ret = -ENOMEM;
3489 goto out;
3490 }
3491 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
3492 inodes, ignore_offset);
3493 btrfs_free_path(path);
3494 if (ret == -EINVAL)
3495 ret = -ENOENT;
3496 if (ret < 0)
3497 goto out;
3498
3499 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
3500 size);
3501 if (ret)
3502 ret = -EFAULT;
3503
3504out:
3505 kvfree(inodes);
3506out_loi:
3507 kfree(loi);
3508
3509 return ret;
3510}
3511
3512void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3513 struct btrfs_ioctl_balance_args *bargs)
3514{
3515 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3516
3517 bargs->flags = bctl->flags;
3518
3519 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
3520 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3521 if (atomic_read(&fs_info->balance_pause_req))
3522 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3523 if (atomic_read(&fs_info->balance_cancel_req))
3524 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3525
3526 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3527 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3528 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3529
3530 spin_lock(&fs_info->balance_lock);
3531 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3532 spin_unlock(&fs_info->balance_lock);
3533}
3534
3535/*
3536 * Try to acquire fs_info::balance_mutex as well as set BTRFS_EXLCOP_BALANCE as
3537 * required.
3538 *
3539 * @fs_info: the filesystem
3540 * @excl_acquired: ptr to boolean value which is set to false in case balance
3541 * is being resumed
3542 *
3543 * Return 0 on success in which case both fs_info::balance is acquired as well
3544 * as exclusive ops are blocked. In case of failure return an error code.
3545 */
3546static int btrfs_try_lock_balance(struct btrfs_fs_info *fs_info, bool *excl_acquired)
3547{
3548 int ret;
3549
3550 /*
3551 * Exclusive operation is locked. Three possibilities:
3552 * (1) some other op is running
3553 * (2) balance is running
3554 * (3) balance is paused -- special case (think resume)
3555 */
3556 while (1) {
3557 if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
3558 *excl_acquired = true;
3559 mutex_lock(&fs_info->balance_mutex);
3560 return 0;
3561 }
3562
3563 mutex_lock(&fs_info->balance_mutex);
3564 if (fs_info->balance_ctl) {
3565 /* This is either (2) or (3) */
3566 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3567 /* This is (2) */
3568 ret = -EINPROGRESS;
3569 goto out_failure;
3570
3571 } else {
3572 mutex_unlock(&fs_info->balance_mutex);
3573 /*
3574 * Lock released to allow other waiters to
3575 * continue, we'll reexamine the status again.
3576 */
3577 mutex_lock(&fs_info->balance_mutex);
3578
3579 if (fs_info->balance_ctl &&
3580 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
3581 /* This is (3) */
3582 *excl_acquired = false;
3583 return 0;
3584 }
3585 }
3586 } else {
3587 /* This is (1) */
3588 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3589 goto out_failure;
3590 }
3591
3592 mutex_unlock(&fs_info->balance_mutex);
3593 }
3594
3595out_failure:
3596 mutex_unlock(&fs_info->balance_mutex);
3597 *excl_acquired = false;
3598 return ret;
3599}
3600
3601static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3602{
3603 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3604 struct btrfs_fs_info *fs_info = root->fs_info;
3605 struct btrfs_ioctl_balance_args *bargs;
3606 struct btrfs_balance_control *bctl;
3607 bool need_unlock = true;
3608 int ret;
3609
3610 if (!capable(CAP_SYS_ADMIN))
3611 return -EPERM;
3612
3613 ret = mnt_want_write_file(file);
3614 if (ret)
3615 return ret;
3616
3617 bargs = memdup_user(arg, sizeof(*bargs));
3618 if (IS_ERR(bargs)) {
3619 ret = PTR_ERR(bargs);
3620 bargs = NULL;
3621 goto out;
3622 }
3623
3624 ret = btrfs_try_lock_balance(fs_info, &need_unlock);
3625 if (ret)
3626 goto out;
3627
3628 lockdep_assert_held(&fs_info->balance_mutex);
3629
3630 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3631 if (!fs_info->balance_ctl) {
3632 ret = -ENOTCONN;
3633 goto out_unlock;
3634 }
3635
3636 bctl = fs_info->balance_ctl;
3637 spin_lock(&fs_info->balance_lock);
3638 bctl->flags |= BTRFS_BALANCE_RESUME;
3639 spin_unlock(&fs_info->balance_lock);
3640 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE);
3641
3642 goto do_balance;
3643 }
3644
3645 if (bargs->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
3646 ret = -EINVAL;
3647 goto out_unlock;
3648 }
3649
3650 if (fs_info->balance_ctl) {
3651 ret = -EINPROGRESS;
3652 goto out_unlock;
3653 }
3654
3655 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
3656 if (!bctl) {
3657 ret = -ENOMEM;
3658 goto out_unlock;
3659 }
3660
3661 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3662 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3663 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3664
3665 bctl->flags = bargs->flags;
3666do_balance:
3667 /*
3668 * Ownership of bctl and exclusive operation goes to btrfs_balance.
3669 * bctl is freed in reset_balance_state, or, if restriper was paused
3670 * all the way until unmount, in free_fs_info. The flag should be
3671 * cleared after reset_balance_state.
3672 */
3673 need_unlock = false;
3674
3675 ret = btrfs_balance(fs_info, bctl, bargs);
3676 bctl = NULL;
3677
3678 if (ret == 0 || ret == -ECANCELED) {
3679 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3680 ret = -EFAULT;
3681 }
3682
3683 kfree(bctl);
3684out_unlock:
3685 mutex_unlock(&fs_info->balance_mutex);
3686 if (need_unlock)
3687 btrfs_exclop_finish(fs_info);
3688out:
3689 mnt_drop_write_file(file);
3690 kfree(bargs);
3691 return ret;
3692}
3693
3694static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
3695{
3696 if (!capable(CAP_SYS_ADMIN))
3697 return -EPERM;
3698
3699 switch (cmd) {
3700 case BTRFS_BALANCE_CTL_PAUSE:
3701 return btrfs_pause_balance(fs_info);
3702 case BTRFS_BALANCE_CTL_CANCEL:
3703 return btrfs_cancel_balance(fs_info);
3704 }
3705
3706 return -EINVAL;
3707}
3708
3709static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
3710 void __user *arg)
3711{
3712 struct btrfs_ioctl_balance_args *bargs;
3713 int ret = 0;
3714
3715 if (!capable(CAP_SYS_ADMIN))
3716 return -EPERM;
3717
3718 mutex_lock(&fs_info->balance_mutex);
3719 if (!fs_info->balance_ctl) {
3720 ret = -ENOTCONN;
3721 goto out;
3722 }
3723
3724 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
3725 if (!bargs) {
3726 ret = -ENOMEM;
3727 goto out;
3728 }
3729
3730 btrfs_update_ioctl_balance_args(fs_info, bargs);
3731
3732 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3733 ret = -EFAULT;
3734
3735 kfree(bargs);
3736out:
3737 mutex_unlock(&fs_info->balance_mutex);
3738 return ret;
3739}
3740
3741static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
3742{
3743 struct inode *inode = file_inode(file);
3744 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
3745 struct btrfs_ioctl_quota_ctl_args *sa;
3746 int ret;
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 switch (sa->cmd) {
3762 case BTRFS_QUOTA_CTL_ENABLE:
3763 case BTRFS_QUOTA_CTL_ENABLE_SIMPLE_QUOTA:
3764 down_write(&fs_info->subvol_sem);
3765 ret = btrfs_quota_enable(fs_info, sa);
3766 up_write(&fs_info->subvol_sem);
3767 break;
3768 case BTRFS_QUOTA_CTL_DISABLE:
3769 /*
3770 * Lock the cleaner mutex to prevent races with concurrent
3771 * relocation, because relocation may be building backrefs for
3772 * blocks of the quota root while we are deleting the root. This
3773 * is like dropping fs roots of deleted snapshots/subvolumes, we
3774 * need the same protection.
3775 *
3776 * This also prevents races between concurrent tasks trying to
3777 * disable quotas, because we will unlock and relock
3778 * qgroup_ioctl_lock across BTRFS_FS_QUOTA_ENABLED changes.
3779 *
3780 * We take this here because we have the dependency of
3781 *
3782 * inode_lock -> subvol_sem
3783 *
3784 * because of rename. With relocation we can prealloc extents,
3785 * so that makes the dependency chain
3786 *
3787 * cleaner_mutex -> inode_lock -> subvol_sem
3788 *
3789 * so we must take the cleaner_mutex here before we take the
3790 * subvol_sem. The deadlock can't actually happen, but this
3791 * quiets lockdep.
3792 */
3793 mutex_lock(&fs_info->cleaner_mutex);
3794 down_write(&fs_info->subvol_sem);
3795 ret = btrfs_quota_disable(fs_info);
3796 up_write(&fs_info->subvol_sem);
3797 mutex_unlock(&fs_info->cleaner_mutex);
3798 break;
3799 default:
3800 ret = -EINVAL;
3801 break;
3802 }
3803
3804 kfree(sa);
3805drop_write:
3806 mnt_drop_write_file(file);
3807 return ret;
3808}
3809
3810static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
3811{
3812 struct inode *inode = file_inode(file);
3813 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
3814 struct btrfs_root *root = BTRFS_I(inode)->root;
3815 struct btrfs_ioctl_qgroup_assign_args *sa;
3816 struct btrfs_trans_handle *trans;
3817 int ret;
3818 int err;
3819
3820 if (!capable(CAP_SYS_ADMIN))
3821 return -EPERM;
3822
3823 ret = mnt_want_write_file(file);
3824 if (ret)
3825 return ret;
3826
3827 sa = memdup_user(arg, sizeof(*sa));
3828 if (IS_ERR(sa)) {
3829 ret = PTR_ERR(sa);
3830 goto drop_write;
3831 }
3832
3833 trans = btrfs_join_transaction(root);
3834 if (IS_ERR(trans)) {
3835 ret = PTR_ERR(trans);
3836 goto out;
3837 }
3838
3839 if (sa->assign) {
3840 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
3841 } else {
3842 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
3843 }
3844
3845 /* update qgroup status and info */
3846 mutex_lock(&fs_info->qgroup_ioctl_lock);
3847 err = btrfs_run_qgroups(trans);
3848 mutex_unlock(&fs_info->qgroup_ioctl_lock);
3849 if (err < 0)
3850 btrfs_handle_fs_error(fs_info, err,
3851 "failed to update qgroup status and info");
3852 err = btrfs_end_transaction(trans);
3853 if (err && !ret)
3854 ret = err;
3855
3856out:
3857 kfree(sa);
3858drop_write:
3859 mnt_drop_write_file(file);
3860 return ret;
3861}
3862
3863static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
3864{
3865 struct inode *inode = file_inode(file);
3866 struct btrfs_root *root = BTRFS_I(inode)->root;
3867 struct btrfs_ioctl_qgroup_create_args *sa;
3868 struct btrfs_trans_handle *trans;
3869 int ret;
3870 int err;
3871
3872 if (!capable(CAP_SYS_ADMIN))
3873 return -EPERM;
3874
3875 ret = mnt_want_write_file(file);
3876 if (ret)
3877 return ret;
3878
3879 sa = memdup_user(arg, sizeof(*sa));
3880 if (IS_ERR(sa)) {
3881 ret = PTR_ERR(sa);
3882 goto drop_write;
3883 }
3884
3885 if (!sa->qgroupid) {
3886 ret = -EINVAL;
3887 goto out;
3888 }
3889
3890 if (sa->create && is_fstree(sa->qgroupid)) {
3891 ret = -EINVAL;
3892 goto out;
3893 }
3894
3895 trans = btrfs_join_transaction(root);
3896 if (IS_ERR(trans)) {
3897 ret = PTR_ERR(trans);
3898 goto out;
3899 }
3900
3901 if (sa->create) {
3902 ret = btrfs_create_qgroup(trans, sa->qgroupid);
3903 } else {
3904 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
3905 }
3906
3907 err = btrfs_end_transaction(trans);
3908 if (err && !ret)
3909 ret = err;
3910
3911out:
3912 kfree(sa);
3913drop_write:
3914 mnt_drop_write_file(file);
3915 return ret;
3916}
3917
3918static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
3919{
3920 struct inode *inode = file_inode(file);
3921 struct btrfs_root *root = BTRFS_I(inode)->root;
3922 struct btrfs_ioctl_qgroup_limit_args *sa;
3923 struct btrfs_trans_handle *trans;
3924 int ret;
3925 int err;
3926 u64 qgroupid;
3927
3928 if (!capable(CAP_SYS_ADMIN))
3929 return -EPERM;
3930
3931 ret = mnt_want_write_file(file);
3932 if (ret)
3933 return ret;
3934
3935 sa = memdup_user(arg, sizeof(*sa));
3936 if (IS_ERR(sa)) {
3937 ret = PTR_ERR(sa);
3938 goto drop_write;
3939 }
3940
3941 trans = btrfs_join_transaction(root);
3942 if (IS_ERR(trans)) {
3943 ret = PTR_ERR(trans);
3944 goto out;
3945 }
3946
3947 qgroupid = sa->qgroupid;
3948 if (!qgroupid) {
3949 /* take the current subvol as qgroup */
3950 qgroupid = root->root_key.objectid;
3951 }
3952
3953 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
3954
3955 err = btrfs_end_transaction(trans);
3956 if (err && !ret)
3957 ret = err;
3958
3959out:
3960 kfree(sa);
3961drop_write:
3962 mnt_drop_write_file(file);
3963 return ret;
3964}
3965
3966static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
3967{
3968 struct inode *inode = file_inode(file);
3969 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
3970 struct btrfs_ioctl_quota_rescan_args *qsa;
3971 int ret;
3972
3973 if (!capable(CAP_SYS_ADMIN))
3974 return -EPERM;
3975
3976 ret = mnt_want_write_file(file);
3977 if (ret)
3978 return ret;
3979
3980 qsa = memdup_user(arg, sizeof(*qsa));
3981 if (IS_ERR(qsa)) {
3982 ret = PTR_ERR(qsa);
3983 goto drop_write;
3984 }
3985
3986 if (qsa->flags) {
3987 ret = -EINVAL;
3988 goto out;
3989 }
3990
3991 ret = btrfs_qgroup_rescan(fs_info);
3992
3993out:
3994 kfree(qsa);
3995drop_write:
3996 mnt_drop_write_file(file);
3997 return ret;
3998}
3999
4000static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
4001 void __user *arg)
4002{
4003 struct btrfs_ioctl_quota_rescan_args qsa = {0};
4004
4005 if (!capable(CAP_SYS_ADMIN))
4006 return -EPERM;
4007
4008 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4009 qsa.flags = 1;
4010 qsa.progress = fs_info->qgroup_rescan_progress.objectid;
4011 }
4012
4013 if (copy_to_user(arg, &qsa, sizeof(qsa)))
4014 return -EFAULT;
4015
4016 return 0;
4017}
4018
4019static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
4020 void __user *arg)
4021{
4022 if (!capable(CAP_SYS_ADMIN))
4023 return -EPERM;
4024
4025 return btrfs_qgroup_wait_for_completion(fs_info, true);
4026}
4027
4028static long _btrfs_ioctl_set_received_subvol(struct file *file,
4029 struct mnt_idmap *idmap,
4030 struct btrfs_ioctl_received_subvol_args *sa)
4031{
4032 struct inode *inode = file_inode(file);
4033 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4034 struct btrfs_root *root = BTRFS_I(inode)->root;
4035 struct btrfs_root_item *root_item = &root->root_item;
4036 struct btrfs_trans_handle *trans;
4037 struct timespec64 ct = current_time(inode);
4038 int ret = 0;
4039 int received_uuid_changed;
4040
4041 if (!inode_owner_or_capable(idmap, inode))
4042 return -EPERM;
4043
4044 ret = mnt_want_write_file(file);
4045 if (ret < 0)
4046 return ret;
4047
4048 down_write(&fs_info->subvol_sem);
4049
4050 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
4051 ret = -EINVAL;
4052 goto out;
4053 }
4054
4055 if (btrfs_root_readonly(root)) {
4056 ret = -EROFS;
4057 goto out;
4058 }
4059
4060 /*
4061 * 1 - root item
4062 * 2 - uuid items (received uuid + subvol uuid)
4063 */
4064 trans = btrfs_start_transaction(root, 3);
4065 if (IS_ERR(trans)) {
4066 ret = PTR_ERR(trans);
4067 trans = NULL;
4068 goto out;
4069 }
4070
4071 sa->rtransid = trans->transid;
4072 sa->rtime.sec = ct.tv_sec;
4073 sa->rtime.nsec = ct.tv_nsec;
4074
4075 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4076 BTRFS_UUID_SIZE);
4077 if (received_uuid_changed &&
4078 !btrfs_is_empty_uuid(root_item->received_uuid)) {
4079 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
4080 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4081 root->root_key.objectid);
4082 if (ret && ret != -ENOENT) {
4083 btrfs_abort_transaction(trans, ret);
4084 btrfs_end_transaction(trans);
4085 goto out;
4086 }
4087 }
4088 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4089 btrfs_set_root_stransid(root_item, sa->stransid);
4090 btrfs_set_root_rtransid(root_item, sa->rtransid);
4091 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4092 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4093 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4094 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4095
4096 ret = btrfs_update_root(trans, fs_info->tree_root,
4097 &root->root_key, &root->root_item);
4098 if (ret < 0) {
4099 btrfs_end_transaction(trans);
4100 goto out;
4101 }
4102 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4103 ret = btrfs_uuid_tree_add(trans, sa->uuid,
4104 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4105 root->root_key.objectid);
4106 if (ret < 0 && ret != -EEXIST) {
4107 btrfs_abort_transaction(trans, ret);
4108 btrfs_end_transaction(trans);
4109 goto out;
4110 }
4111 }
4112 ret = btrfs_commit_transaction(trans);
4113out:
4114 up_write(&fs_info->subvol_sem);
4115 mnt_drop_write_file(file);
4116 return ret;
4117}
4118
4119#ifdef CONFIG_64BIT
4120static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4121 void __user *arg)
4122{
4123 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4124 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4125 int ret = 0;
4126
4127 args32 = memdup_user(arg, sizeof(*args32));
4128 if (IS_ERR(args32))
4129 return PTR_ERR(args32);
4130
4131 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
4132 if (!args64) {
4133 ret = -ENOMEM;
4134 goto out;
4135 }
4136
4137 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4138 args64->stransid = args32->stransid;
4139 args64->rtransid = args32->rtransid;
4140 args64->stime.sec = args32->stime.sec;
4141 args64->stime.nsec = args32->stime.nsec;
4142 args64->rtime.sec = args32->rtime.sec;
4143 args64->rtime.nsec = args32->rtime.nsec;
4144 args64->flags = args32->flags;
4145
4146 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), args64);
4147 if (ret)
4148 goto out;
4149
4150 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4151 args32->stransid = args64->stransid;
4152 args32->rtransid = args64->rtransid;
4153 args32->stime.sec = args64->stime.sec;
4154 args32->stime.nsec = args64->stime.nsec;
4155 args32->rtime.sec = args64->rtime.sec;
4156 args32->rtime.nsec = args64->rtime.nsec;
4157 args32->flags = args64->flags;
4158
4159 ret = copy_to_user(arg, args32, sizeof(*args32));
4160 if (ret)
4161 ret = -EFAULT;
4162
4163out:
4164 kfree(args32);
4165 kfree(args64);
4166 return ret;
4167}
4168#endif
4169
4170static long btrfs_ioctl_set_received_subvol(struct file *file,
4171 void __user *arg)
4172{
4173 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4174 int ret = 0;
4175
4176 sa = memdup_user(arg, sizeof(*sa));
4177 if (IS_ERR(sa))
4178 return PTR_ERR(sa);
4179
4180 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_idmap(file), sa);
4181
4182 if (ret)
4183 goto out;
4184
4185 ret = copy_to_user(arg, sa, sizeof(*sa));
4186 if (ret)
4187 ret = -EFAULT;
4188
4189out:
4190 kfree(sa);
4191 return ret;
4192}
4193
4194static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
4195 void __user *arg)
4196{
4197 size_t len;
4198 int ret;
4199 char label[BTRFS_LABEL_SIZE];
4200
4201 spin_lock(&fs_info->super_lock);
4202 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4203 spin_unlock(&fs_info->super_lock);
4204
4205 len = strnlen(label, BTRFS_LABEL_SIZE);
4206
4207 if (len == BTRFS_LABEL_SIZE) {
4208 btrfs_warn(fs_info,
4209 "label is too long, return the first %zu bytes",
4210 --len);
4211 }
4212
4213 ret = copy_to_user(arg, label, len);
4214
4215 return ret ? -EFAULT : 0;
4216}
4217
4218static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4219{
4220 struct inode *inode = file_inode(file);
4221 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4222 struct btrfs_root *root = BTRFS_I(inode)->root;
4223 struct btrfs_super_block *super_block = fs_info->super_copy;
4224 struct btrfs_trans_handle *trans;
4225 char label[BTRFS_LABEL_SIZE];
4226 int ret;
4227
4228 if (!capable(CAP_SYS_ADMIN))
4229 return -EPERM;
4230
4231 if (copy_from_user(label, arg, sizeof(label)))
4232 return -EFAULT;
4233
4234 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4235 btrfs_err(fs_info,
4236 "unable to set label with more than %d bytes",
4237 BTRFS_LABEL_SIZE - 1);
4238 return -EINVAL;
4239 }
4240
4241 ret = mnt_want_write_file(file);
4242 if (ret)
4243 return ret;
4244
4245 trans = btrfs_start_transaction(root, 0);
4246 if (IS_ERR(trans)) {
4247 ret = PTR_ERR(trans);
4248 goto out_unlock;
4249 }
4250
4251 spin_lock(&fs_info->super_lock);
4252 strcpy(super_block->label, label);
4253 spin_unlock(&fs_info->super_lock);
4254 ret = btrfs_commit_transaction(trans);
4255
4256out_unlock:
4257 mnt_drop_write_file(file);
4258 return ret;
4259}
4260
4261#define INIT_FEATURE_FLAGS(suffix) \
4262 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4263 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4264 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4265
4266int btrfs_ioctl_get_supported_features(void __user *arg)
4267{
4268 static const struct btrfs_ioctl_feature_flags features[3] = {
4269 INIT_FEATURE_FLAGS(SUPP),
4270 INIT_FEATURE_FLAGS(SAFE_SET),
4271 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4272 };
4273
4274 if (copy_to_user(arg, &features, sizeof(features)))
4275 return -EFAULT;
4276
4277 return 0;
4278}
4279
4280static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
4281 void __user *arg)
4282{
4283 struct btrfs_super_block *super_block = fs_info->super_copy;
4284 struct btrfs_ioctl_feature_flags features;
4285
4286 features.compat_flags = btrfs_super_compat_flags(super_block);
4287 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4288 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4289
4290 if (copy_to_user(arg, &features, sizeof(features)))
4291 return -EFAULT;
4292
4293 return 0;
4294}
4295
4296static int check_feature_bits(struct btrfs_fs_info *fs_info,
4297 enum btrfs_feature_set set,
4298 u64 change_mask, u64 flags, u64 supported_flags,
4299 u64 safe_set, u64 safe_clear)
4300{
4301 const char *type = btrfs_feature_set_name(set);
4302 char *names;
4303 u64 disallowed, unsupported;
4304 u64 set_mask = flags & change_mask;
4305 u64 clear_mask = ~flags & change_mask;
4306
4307 unsupported = set_mask & ~supported_flags;
4308 if (unsupported) {
4309 names = btrfs_printable_features(set, unsupported);
4310 if (names) {
4311 btrfs_warn(fs_info,
4312 "this kernel does not support the %s feature bit%s",
4313 names, strchr(names, ',') ? "s" : "");
4314 kfree(names);
4315 } else
4316 btrfs_warn(fs_info,
4317 "this kernel does not support %s bits 0x%llx",
4318 type, unsupported);
4319 return -EOPNOTSUPP;
4320 }
4321
4322 disallowed = set_mask & ~safe_set;
4323 if (disallowed) {
4324 names = btrfs_printable_features(set, disallowed);
4325 if (names) {
4326 btrfs_warn(fs_info,
4327 "can't set the %s feature bit%s while mounted",
4328 names, strchr(names, ',') ? "s" : "");
4329 kfree(names);
4330 } else
4331 btrfs_warn(fs_info,
4332 "can't set %s bits 0x%llx while mounted",
4333 type, disallowed);
4334 return -EPERM;
4335 }
4336
4337 disallowed = clear_mask & ~safe_clear;
4338 if (disallowed) {
4339 names = btrfs_printable_features(set, disallowed);
4340 if (names) {
4341 btrfs_warn(fs_info,
4342 "can't clear the %s feature bit%s while mounted",
4343 names, strchr(names, ',') ? "s" : "");
4344 kfree(names);
4345 } else
4346 btrfs_warn(fs_info,
4347 "can't clear %s bits 0x%llx while mounted",
4348 type, disallowed);
4349 return -EPERM;
4350 }
4351
4352 return 0;
4353}
4354
4355#define check_feature(fs_info, change_mask, flags, mask_base) \
4356check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
4357 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4358 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4359 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4360
4361static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4362{
4363 struct inode *inode = file_inode(file);
4364 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4365 struct btrfs_root *root = BTRFS_I(inode)->root;
4366 struct btrfs_super_block *super_block = fs_info->super_copy;
4367 struct btrfs_ioctl_feature_flags flags[2];
4368 struct btrfs_trans_handle *trans;
4369 u64 newflags;
4370 int ret;
4371
4372 if (!capable(CAP_SYS_ADMIN))
4373 return -EPERM;
4374
4375 if (copy_from_user(flags, arg, sizeof(flags)))
4376 return -EFAULT;
4377
4378 /* Nothing to do */
4379 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4380 !flags[0].incompat_flags)
4381 return 0;
4382
4383 ret = check_feature(fs_info, flags[0].compat_flags,
4384 flags[1].compat_flags, COMPAT);
4385 if (ret)
4386 return ret;
4387
4388 ret = check_feature(fs_info, flags[0].compat_ro_flags,
4389 flags[1].compat_ro_flags, COMPAT_RO);
4390 if (ret)
4391 return ret;
4392
4393 ret = check_feature(fs_info, flags[0].incompat_flags,
4394 flags[1].incompat_flags, INCOMPAT);
4395 if (ret)
4396 return ret;
4397
4398 ret = mnt_want_write_file(file);
4399 if (ret)
4400 return ret;
4401
4402 trans = btrfs_start_transaction(root, 0);
4403 if (IS_ERR(trans)) {
4404 ret = PTR_ERR(trans);
4405 goto out_drop_write;
4406 }
4407
4408 spin_lock(&fs_info->super_lock);
4409 newflags = btrfs_super_compat_flags(super_block);
4410 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4411 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4412 btrfs_set_super_compat_flags(super_block, newflags);
4413
4414 newflags = btrfs_super_compat_ro_flags(super_block);
4415 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4416 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4417 btrfs_set_super_compat_ro_flags(super_block, newflags);
4418
4419 newflags = btrfs_super_incompat_flags(super_block);
4420 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4421 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4422 btrfs_set_super_incompat_flags(super_block, newflags);
4423 spin_unlock(&fs_info->super_lock);
4424
4425 ret = btrfs_commit_transaction(trans);
4426out_drop_write:
4427 mnt_drop_write_file(file);
4428
4429 return ret;
4430}
4431
4432static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat)
4433{
4434 struct btrfs_ioctl_send_args *arg;
4435 int ret;
4436
4437 if (compat) {
4438#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4439 struct btrfs_ioctl_send_args_32 args32 = { 0 };
4440
4441 ret = copy_from_user(&args32, argp, sizeof(args32));
4442 if (ret)
4443 return -EFAULT;
4444 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
4445 if (!arg)
4446 return -ENOMEM;
4447 arg->send_fd = args32.send_fd;
4448 arg->clone_sources_count = args32.clone_sources_count;
4449 arg->clone_sources = compat_ptr(args32.clone_sources);
4450 arg->parent_root = args32.parent_root;
4451 arg->flags = args32.flags;
4452 arg->version = args32.version;
4453 memcpy(arg->reserved, args32.reserved,
4454 sizeof(args32.reserved));
4455#else
4456 return -ENOTTY;
4457#endif
4458 } else {
4459 arg = memdup_user(argp, sizeof(*arg));
4460 if (IS_ERR(arg))
4461 return PTR_ERR(arg);
4462 }
4463 ret = btrfs_ioctl_send(inode, arg);
4464 kfree(arg);
4465 return ret;
4466}
4467
4468static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp,
4469 bool compat)
4470{
4471 struct btrfs_ioctl_encoded_io_args args = { 0 };
4472 size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args,
4473 flags);
4474 size_t copy_end;
4475 struct iovec iovstack[UIO_FASTIOV];
4476 struct iovec *iov = iovstack;
4477 struct iov_iter iter;
4478 loff_t pos;
4479 struct kiocb kiocb;
4480 ssize_t ret;
4481
4482 if (!capable(CAP_SYS_ADMIN)) {
4483 ret = -EPERM;
4484 goto out_acct;
4485 }
4486
4487 if (compat) {
4488#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4489 struct btrfs_ioctl_encoded_io_args_32 args32;
4490
4491 copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32,
4492 flags);
4493 if (copy_from_user(&args32, argp, copy_end)) {
4494 ret = -EFAULT;
4495 goto out_acct;
4496 }
4497 args.iov = compat_ptr(args32.iov);
4498 args.iovcnt = args32.iovcnt;
4499 args.offset = args32.offset;
4500 args.flags = args32.flags;
4501#else
4502 return -ENOTTY;
4503#endif
4504 } else {
4505 copy_end = copy_end_kernel;
4506 if (copy_from_user(&args, argp, copy_end)) {
4507 ret = -EFAULT;
4508 goto out_acct;
4509 }
4510 }
4511 if (args.flags != 0) {
4512 ret = -EINVAL;
4513 goto out_acct;
4514 }
4515
4516 ret = import_iovec(ITER_DEST, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4517 &iov, &iter);
4518 if (ret < 0)
4519 goto out_acct;
4520
4521 if (iov_iter_count(&iter) == 0) {
4522 ret = 0;
4523 goto out_iov;
4524 }
4525 pos = args.offset;
4526 ret = rw_verify_area(READ, file, &pos, args.len);
4527 if (ret < 0)
4528 goto out_iov;
4529
4530 init_sync_kiocb(&kiocb, file);
4531 kiocb.ki_pos = pos;
4532
4533 ret = btrfs_encoded_read(&kiocb, &iter, &args);
4534 if (ret >= 0) {
4535 fsnotify_access(file);
4536 if (copy_to_user(argp + copy_end,
4537 (char *)&args + copy_end_kernel,
4538 sizeof(args) - copy_end_kernel))
4539 ret = -EFAULT;
4540 }
4541
4542out_iov:
4543 kfree(iov);
4544out_acct:
4545 if (ret > 0)
4546 add_rchar(current, ret);
4547 inc_syscr(current);
4548 return ret;
4549}
4550
4551static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat)
4552{
4553 struct btrfs_ioctl_encoded_io_args args;
4554 struct iovec iovstack[UIO_FASTIOV];
4555 struct iovec *iov = iovstack;
4556 struct iov_iter iter;
4557 loff_t pos;
4558 struct kiocb kiocb;
4559 ssize_t ret;
4560
4561 if (!capable(CAP_SYS_ADMIN)) {
4562 ret = -EPERM;
4563 goto out_acct;
4564 }
4565
4566 if (!(file->f_mode & FMODE_WRITE)) {
4567 ret = -EBADF;
4568 goto out_acct;
4569 }
4570
4571 if (compat) {
4572#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4573 struct btrfs_ioctl_encoded_io_args_32 args32;
4574
4575 if (copy_from_user(&args32, argp, sizeof(args32))) {
4576 ret = -EFAULT;
4577 goto out_acct;
4578 }
4579 args.iov = compat_ptr(args32.iov);
4580 args.iovcnt = args32.iovcnt;
4581 args.offset = args32.offset;
4582 args.flags = args32.flags;
4583 args.len = args32.len;
4584 args.unencoded_len = args32.unencoded_len;
4585 args.unencoded_offset = args32.unencoded_offset;
4586 args.compression = args32.compression;
4587 args.encryption = args32.encryption;
4588 memcpy(args.reserved, args32.reserved, sizeof(args.reserved));
4589#else
4590 return -ENOTTY;
4591#endif
4592 } else {
4593 if (copy_from_user(&args, argp, sizeof(args))) {
4594 ret = -EFAULT;
4595 goto out_acct;
4596 }
4597 }
4598
4599 ret = -EINVAL;
4600 if (args.flags != 0)
4601 goto out_acct;
4602 if (memchr_inv(args.reserved, 0, sizeof(args.reserved)))
4603 goto out_acct;
4604 if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE &&
4605 args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE)
4606 goto out_acct;
4607 if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES ||
4608 args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES)
4609 goto out_acct;
4610 if (args.unencoded_offset > args.unencoded_len)
4611 goto out_acct;
4612 if (args.len > args.unencoded_len - args.unencoded_offset)
4613 goto out_acct;
4614
4615 ret = import_iovec(ITER_SOURCE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
4616 &iov, &iter);
4617 if (ret < 0)
4618 goto out_acct;
4619
4620 if (iov_iter_count(&iter) == 0) {
4621 ret = 0;
4622 goto out_iov;
4623 }
4624 pos = args.offset;
4625 ret = rw_verify_area(WRITE, file, &pos, args.len);
4626 if (ret < 0)
4627 goto out_iov;
4628
4629 init_sync_kiocb(&kiocb, file);
4630 ret = kiocb_set_rw_flags(&kiocb, 0);
4631 if (ret)
4632 goto out_iov;
4633 kiocb.ki_pos = pos;
4634
4635 file_start_write(file);
4636
4637 ret = btrfs_do_write_iter(&kiocb, &iter, &args);
4638 if (ret > 0)
4639 fsnotify_modify(file);
4640
4641 file_end_write(file);
4642out_iov:
4643 kfree(iov);
4644out_acct:
4645 if (ret > 0)
4646 add_wchar(current, ret);
4647 inc_syscw(current);
4648 return ret;
4649}
4650
4651long btrfs_ioctl(struct file *file, unsigned int
4652 cmd, unsigned long arg)
4653{
4654 struct inode *inode = file_inode(file);
4655 struct btrfs_fs_info *fs_info = inode_to_fs_info(inode);
4656 struct btrfs_root *root = BTRFS_I(inode)->root;
4657 void __user *argp = (void __user *)arg;
4658
4659 switch (cmd) {
4660 case FS_IOC_GETVERSION:
4661 return btrfs_ioctl_getversion(inode, argp);
4662 case FS_IOC_GETFSLABEL:
4663 return btrfs_ioctl_get_fslabel(fs_info, argp);
4664 case FS_IOC_SETFSLABEL:
4665 return btrfs_ioctl_set_fslabel(file, argp);
4666 case FITRIM:
4667 return btrfs_ioctl_fitrim(fs_info, argp);
4668 case BTRFS_IOC_SNAP_CREATE:
4669 return btrfs_ioctl_snap_create(file, argp, 0);
4670 case BTRFS_IOC_SNAP_CREATE_V2:
4671 return btrfs_ioctl_snap_create_v2(file, argp, 0);
4672 case BTRFS_IOC_SUBVOL_CREATE:
4673 return btrfs_ioctl_snap_create(file, argp, 1);
4674 case BTRFS_IOC_SUBVOL_CREATE_V2:
4675 return btrfs_ioctl_snap_create_v2(file, argp, 1);
4676 case BTRFS_IOC_SNAP_DESTROY:
4677 return btrfs_ioctl_snap_destroy(file, argp, false);
4678 case BTRFS_IOC_SNAP_DESTROY_V2:
4679 return btrfs_ioctl_snap_destroy(file, argp, true);
4680 case BTRFS_IOC_SUBVOL_GETFLAGS:
4681 return btrfs_ioctl_subvol_getflags(inode, argp);
4682 case BTRFS_IOC_SUBVOL_SETFLAGS:
4683 return btrfs_ioctl_subvol_setflags(file, argp);
4684 case BTRFS_IOC_DEFAULT_SUBVOL:
4685 return btrfs_ioctl_default_subvol(file, argp);
4686 case BTRFS_IOC_DEFRAG:
4687 return btrfs_ioctl_defrag(file, NULL);
4688 case BTRFS_IOC_DEFRAG_RANGE:
4689 return btrfs_ioctl_defrag(file, argp);
4690 case BTRFS_IOC_RESIZE:
4691 return btrfs_ioctl_resize(file, argp);
4692 case BTRFS_IOC_ADD_DEV:
4693 return btrfs_ioctl_add_dev(fs_info, argp);
4694 case BTRFS_IOC_RM_DEV:
4695 return btrfs_ioctl_rm_dev(file, argp);
4696 case BTRFS_IOC_RM_DEV_V2:
4697 return btrfs_ioctl_rm_dev_v2(file, argp);
4698 case BTRFS_IOC_FS_INFO:
4699 return btrfs_ioctl_fs_info(fs_info, argp);
4700 case BTRFS_IOC_DEV_INFO:
4701 return btrfs_ioctl_dev_info(fs_info, argp);
4702 case BTRFS_IOC_TREE_SEARCH:
4703 return btrfs_ioctl_tree_search(inode, argp);
4704 case BTRFS_IOC_TREE_SEARCH_V2:
4705 return btrfs_ioctl_tree_search_v2(inode, argp);
4706 case BTRFS_IOC_INO_LOOKUP:
4707 return btrfs_ioctl_ino_lookup(root, argp);
4708 case BTRFS_IOC_INO_PATHS:
4709 return btrfs_ioctl_ino_to_path(root, argp);
4710 case BTRFS_IOC_LOGICAL_INO:
4711 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
4712 case BTRFS_IOC_LOGICAL_INO_V2:
4713 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
4714 case BTRFS_IOC_SPACE_INFO:
4715 return btrfs_ioctl_space_info(fs_info, argp);
4716 case BTRFS_IOC_SYNC: {
4717 int ret;
4718
4719 ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
4720 if (ret)
4721 return ret;
4722 ret = btrfs_sync_fs(inode->i_sb, 1);
4723 /*
4724 * The transaction thread may want to do more work,
4725 * namely it pokes the cleaner kthread that will start
4726 * processing uncleaned subvols.
4727 */
4728 wake_up_process(fs_info->transaction_kthread);
4729 return ret;
4730 }
4731 case BTRFS_IOC_START_SYNC:
4732 return btrfs_ioctl_start_sync(root, argp);
4733 case BTRFS_IOC_WAIT_SYNC:
4734 return btrfs_ioctl_wait_sync(fs_info, argp);
4735 case BTRFS_IOC_SCRUB:
4736 return btrfs_ioctl_scrub(file, argp);
4737 case BTRFS_IOC_SCRUB_CANCEL:
4738 return btrfs_ioctl_scrub_cancel(fs_info);
4739 case BTRFS_IOC_SCRUB_PROGRESS:
4740 return btrfs_ioctl_scrub_progress(fs_info, argp);
4741 case BTRFS_IOC_BALANCE_V2:
4742 return btrfs_ioctl_balance(file, argp);
4743 case BTRFS_IOC_BALANCE_CTL:
4744 return btrfs_ioctl_balance_ctl(fs_info, arg);
4745 case BTRFS_IOC_BALANCE_PROGRESS:
4746 return btrfs_ioctl_balance_progress(fs_info, argp);
4747 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4748 return btrfs_ioctl_set_received_subvol(file, argp);
4749#ifdef CONFIG_64BIT
4750 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
4751 return btrfs_ioctl_set_received_subvol_32(file, argp);
4752#endif
4753 case BTRFS_IOC_SEND:
4754 return _btrfs_ioctl_send(inode, argp, false);
4755#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4756 case BTRFS_IOC_SEND_32:
4757 return _btrfs_ioctl_send(inode, argp, true);
4758#endif
4759 case BTRFS_IOC_GET_DEV_STATS:
4760 return btrfs_ioctl_get_dev_stats(fs_info, argp);
4761 case BTRFS_IOC_QUOTA_CTL:
4762 return btrfs_ioctl_quota_ctl(file, argp);
4763 case BTRFS_IOC_QGROUP_ASSIGN:
4764 return btrfs_ioctl_qgroup_assign(file, argp);
4765 case BTRFS_IOC_QGROUP_CREATE:
4766 return btrfs_ioctl_qgroup_create(file, argp);
4767 case BTRFS_IOC_QGROUP_LIMIT:
4768 return btrfs_ioctl_qgroup_limit(file, argp);
4769 case BTRFS_IOC_QUOTA_RESCAN:
4770 return btrfs_ioctl_quota_rescan(file, argp);
4771 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4772 return btrfs_ioctl_quota_rescan_status(fs_info, argp);
4773 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4774 return btrfs_ioctl_quota_rescan_wait(fs_info, argp);
4775 case BTRFS_IOC_DEV_REPLACE:
4776 return btrfs_ioctl_dev_replace(fs_info, argp);
4777 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4778 return btrfs_ioctl_get_supported_features(argp);
4779 case BTRFS_IOC_GET_FEATURES:
4780 return btrfs_ioctl_get_features(fs_info, argp);
4781 case BTRFS_IOC_SET_FEATURES:
4782 return btrfs_ioctl_set_features(file, argp);
4783 case BTRFS_IOC_GET_SUBVOL_INFO:
4784 return btrfs_ioctl_get_subvol_info(inode, argp);
4785 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
4786 return btrfs_ioctl_get_subvol_rootref(root, argp);
4787 case BTRFS_IOC_INO_LOOKUP_USER:
4788 return btrfs_ioctl_ino_lookup_user(file, argp);
4789 case FS_IOC_ENABLE_VERITY:
4790 return fsverity_ioctl_enable(file, (const void __user *)argp);
4791 case FS_IOC_MEASURE_VERITY:
4792 return fsverity_ioctl_measure(file, argp);
4793 case BTRFS_IOC_ENCODED_READ:
4794 return btrfs_ioctl_encoded_read(file, argp, false);
4795 case BTRFS_IOC_ENCODED_WRITE:
4796 return btrfs_ioctl_encoded_write(file, argp, false);
4797#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4798 case BTRFS_IOC_ENCODED_READ_32:
4799 return btrfs_ioctl_encoded_read(file, argp, true);
4800 case BTRFS_IOC_ENCODED_WRITE_32:
4801 return btrfs_ioctl_encoded_write(file, argp, true);
4802#endif
4803 }
4804
4805 return -ENOTTY;
4806}
4807
4808#ifdef CONFIG_COMPAT
4809long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
4810{
4811 /*
4812 * These all access 32-bit values anyway so no further
4813 * handling is necessary.
4814 */
4815 switch (cmd) {
4816 case FS_IOC32_GETVERSION:
4817 cmd = FS_IOC_GETVERSION;
4818 break;
4819 }
4820
4821 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
4822}
4823#endif