1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/kernel.h>
8 #include <linux/file.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>
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>
35 #include "transaction.h"
36 #include "btrfs_inode.h"
37 #include "print-tree.h"
41 #include "rcu-string.h"
43 #include "dev-replace.h"
48 #include "compression.h"
49 #include "space-info.h"
50 #include "delalloc-space.h"
51 #include "block-group.h"
55 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
56 * structures are incorrect, as the timespec structure from userspace
57 * is 4 bytes too small. We define these alternatives here to teach
58 * the kernel about the 32-bit struct packing.
60 struct btrfs_ioctl_timespec_32 {
63 } __attribute__ ((__packed__));
65 struct btrfs_ioctl_received_subvol_args_32 {
66 char uuid[BTRFS_UUID_SIZE]; /* in */
67 __u64 stransid; /* in */
68 __u64 rtransid; /* out */
69 struct btrfs_ioctl_timespec_32 stime; /* in */
70 struct btrfs_ioctl_timespec_32 rtime; /* out */
72 __u64 reserved[16]; /* in */
73 } __attribute__ ((__packed__));
75 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
76 struct btrfs_ioctl_received_subvol_args_32)
79 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
80 struct btrfs_ioctl_send_args_32 {
81 __s64 send_fd; /* in */
82 __u64 clone_sources_count; /* in */
83 compat_uptr_t clone_sources; /* in */
84 __u64 parent_root; /* in */
86 __u32 version; /* in */
87 __u8 reserved[28]; /* in */
88 } __attribute__ ((__packed__));
90 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
91 struct btrfs_ioctl_send_args_32)
93 struct btrfs_ioctl_encoded_io_args_32 {
95 compat_ulong_t iovcnt;
100 __u64 unencoded_offset;
106 #define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \
107 struct btrfs_ioctl_encoded_io_args_32)
108 #define BTRFS_IOC_ENCODED_WRITE_32 _IOW(BTRFS_IOCTL_MAGIC, 64, \
109 struct btrfs_ioctl_encoded_io_args_32)
112 /* Mask out flags that are inappropriate for the given type of inode. */
113 static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
116 if (S_ISDIR(inode->i_mode))
118 else if (S_ISREG(inode->i_mode))
119 return flags & ~FS_DIRSYNC_FL;
121 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
125 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
128 static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode)
130 unsigned int iflags = 0;
131 u32 flags = binode->flags;
132 u32 ro_flags = binode->ro_flags;
134 if (flags & BTRFS_INODE_SYNC)
135 iflags |= FS_SYNC_FL;
136 if (flags & BTRFS_INODE_IMMUTABLE)
137 iflags |= FS_IMMUTABLE_FL;
138 if (flags & BTRFS_INODE_APPEND)
139 iflags |= FS_APPEND_FL;
140 if (flags & BTRFS_INODE_NODUMP)
141 iflags |= FS_NODUMP_FL;
142 if (flags & BTRFS_INODE_NOATIME)
143 iflags |= FS_NOATIME_FL;
144 if (flags & BTRFS_INODE_DIRSYNC)
145 iflags |= FS_DIRSYNC_FL;
146 if (flags & BTRFS_INODE_NODATACOW)
147 iflags |= FS_NOCOW_FL;
148 if (ro_flags & BTRFS_INODE_RO_VERITY)
149 iflags |= FS_VERITY_FL;
151 if (flags & BTRFS_INODE_NOCOMPRESS)
152 iflags |= FS_NOCOMP_FL;
153 else if (flags & BTRFS_INODE_COMPRESS)
154 iflags |= FS_COMPR_FL;
160 * Update inode->i_flags based on the btrfs internal flags.
162 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
164 struct btrfs_inode *binode = BTRFS_I(inode);
165 unsigned int new_fl = 0;
167 if (binode->flags & BTRFS_INODE_SYNC)
169 if (binode->flags & BTRFS_INODE_IMMUTABLE)
170 new_fl |= S_IMMUTABLE;
171 if (binode->flags & BTRFS_INODE_APPEND)
173 if (binode->flags & BTRFS_INODE_NOATIME)
175 if (binode->flags & BTRFS_INODE_DIRSYNC)
177 if (binode->ro_flags & BTRFS_INODE_RO_VERITY)
180 set_mask_bits(&inode->i_flags,
181 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC |
186 * Check if @flags are a supported and valid set of FS_*_FL flags and that
187 * the old and new flags are not conflicting
189 static int check_fsflags(unsigned int old_flags, unsigned int flags)
191 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
192 FS_NOATIME_FL | FS_NODUMP_FL | \
193 FS_SYNC_FL | FS_DIRSYNC_FL | \
194 FS_NOCOMP_FL | FS_COMPR_FL |
198 /* COMPR and NOCOMP on new/old are valid */
199 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
202 if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
205 /* NOCOW and compression options are mutually exclusive */
206 if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
208 if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
214 static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
217 if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL))
224 * Set flags/xflags from the internal inode flags. The remaining items of
225 * fsxattr are zeroed.
227 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
229 struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
231 fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode));
235 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
236 struct dentry *dentry, struct fileattr *fa)
238 struct inode *inode = d_inode(dentry);
239 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
240 struct btrfs_inode *binode = BTRFS_I(inode);
241 struct btrfs_root *root = binode->root;
242 struct btrfs_trans_handle *trans;
243 unsigned int fsflags, old_fsflags;
245 const char *comp = NULL;
248 if (btrfs_root_readonly(root))
251 if (fileattr_has_fsx(fa))
254 fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
255 old_fsflags = btrfs_inode_flags_to_fsflags(binode);
256 ret = check_fsflags(old_fsflags, fsflags);
260 ret = check_fsflags_compatible(fs_info, fsflags);
264 binode_flags = binode->flags;
265 if (fsflags & FS_SYNC_FL)
266 binode_flags |= BTRFS_INODE_SYNC;
268 binode_flags &= ~BTRFS_INODE_SYNC;
269 if (fsflags & FS_IMMUTABLE_FL)
270 binode_flags |= BTRFS_INODE_IMMUTABLE;
272 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
273 if (fsflags & FS_APPEND_FL)
274 binode_flags |= BTRFS_INODE_APPEND;
276 binode_flags &= ~BTRFS_INODE_APPEND;
277 if (fsflags & FS_NODUMP_FL)
278 binode_flags |= BTRFS_INODE_NODUMP;
280 binode_flags &= ~BTRFS_INODE_NODUMP;
281 if (fsflags & FS_NOATIME_FL)
282 binode_flags |= BTRFS_INODE_NOATIME;
284 binode_flags &= ~BTRFS_INODE_NOATIME;
286 /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
287 if (!fa->flags_valid) {
288 /* 1 item for the inode */
289 trans = btrfs_start_transaction(root, 1);
291 return PTR_ERR(trans);
295 if (fsflags & FS_DIRSYNC_FL)
296 binode_flags |= BTRFS_INODE_DIRSYNC;
298 binode_flags &= ~BTRFS_INODE_DIRSYNC;
299 if (fsflags & FS_NOCOW_FL) {
300 if (S_ISREG(inode->i_mode)) {
302 * It's safe to turn csums off here, no extents exist.
303 * Otherwise we want the flag to reflect the real COW
304 * status of the file and will not set it.
306 if (inode->i_size == 0)
307 binode_flags |= BTRFS_INODE_NODATACOW |
308 BTRFS_INODE_NODATASUM;
310 binode_flags |= BTRFS_INODE_NODATACOW;
314 * Revert back under same assumptions as above
316 if (S_ISREG(inode->i_mode)) {
317 if (inode->i_size == 0)
318 binode_flags &= ~(BTRFS_INODE_NODATACOW |
319 BTRFS_INODE_NODATASUM);
321 binode_flags &= ~BTRFS_INODE_NODATACOW;
326 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
327 * flag may be changed automatically if compression code won't make
330 if (fsflags & FS_NOCOMP_FL) {
331 binode_flags &= ~BTRFS_INODE_COMPRESS;
332 binode_flags |= BTRFS_INODE_NOCOMPRESS;
333 } else if (fsflags & FS_COMPR_FL) {
335 if (IS_SWAPFILE(inode))
338 binode_flags |= BTRFS_INODE_COMPRESS;
339 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
341 comp = btrfs_compress_type2str(fs_info->compress_type);
342 if (!comp || comp[0] == 0)
343 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
345 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
352 trans = btrfs_start_transaction(root, 3);
354 return PTR_ERR(trans);
357 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
360 btrfs_abort_transaction(trans, ret);
364 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
366 if (ret && ret != -ENODATA) {
367 btrfs_abort_transaction(trans, ret);
373 binode->flags = binode_flags;
374 btrfs_sync_inode_flags_to_i_flags(inode);
375 inode_inc_iversion(inode);
376 inode->i_ctime = current_time(inode);
377 ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
380 btrfs_end_transaction(trans);
385 * Start exclusive operation @type, return true on success
387 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
388 enum btrfs_exclusive_operation type)
392 spin_lock(&fs_info->super_lock);
393 if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) {
394 fs_info->exclusive_operation = type;
397 spin_unlock(&fs_info->super_lock);
403 * Conditionally allow to enter the exclusive operation in case it's compatible
404 * with the running one. This must be paired with btrfs_exclop_start_unlock and
405 * btrfs_exclop_finish.
408 * - the same type is already running
409 * - when trying to add a device and balance has been paused
410 * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller
411 * must check the condition first that would allow none -> @type
413 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
414 enum btrfs_exclusive_operation type)
416 spin_lock(&fs_info->super_lock);
417 if (fs_info->exclusive_operation == type ||
418 (fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED &&
419 type == BTRFS_EXCLOP_DEV_ADD))
422 spin_unlock(&fs_info->super_lock);
426 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info)
428 spin_unlock(&fs_info->super_lock);
431 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
433 spin_lock(&fs_info->super_lock);
434 WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
435 spin_unlock(&fs_info->super_lock);
436 sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
439 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
440 enum btrfs_exclusive_operation op)
443 case BTRFS_EXCLOP_BALANCE_PAUSED:
444 spin_lock(&fs_info->super_lock);
445 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE ||
446 fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD);
447 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED;
448 spin_unlock(&fs_info->super_lock);
450 case BTRFS_EXCLOP_BALANCE:
451 spin_lock(&fs_info->super_lock);
452 ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
453 fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE;
454 spin_unlock(&fs_info->super_lock);
458 "invalid exclop balance operation %d requested", op);
462 static int btrfs_ioctl_getversion(struct inode *inode, int __user *arg)
464 return put_user(inode->i_generation, arg);
467 static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
470 struct btrfs_device *device;
471 struct request_queue *q;
472 struct fstrim_range range;
473 u64 minlen = ULLONG_MAX;
477 if (!capable(CAP_SYS_ADMIN))
481 * btrfs_trim_block_group() depends on space cache, which is not
482 * available in zoned filesystem. So, disallow fitrim on a zoned
483 * filesystem for now.
485 if (btrfs_is_zoned(fs_info))
489 * If the fs is mounted with nologreplay, which requires it to be
490 * mounted in RO mode as well, we can not allow discard on free space
491 * inside block groups, because log trees refer to extents that are not
492 * pinned in a block group's free space cache (pinning the extents is
493 * precisely the first phase of replaying a log tree).
495 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
499 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
503 q = bdev_get_queue(device->bdev);
504 if (blk_queue_discard(q)) {
506 minlen = min_t(u64, q->limits.discard_granularity,
514 if (copy_from_user(&range, arg, sizeof(range)))
518 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
519 * block group is in the logical address space, which can be any
520 * sectorsize aligned bytenr in the range [0, U64_MAX].
522 if (range.len < fs_info->sb->s_blocksize)
525 range.minlen = max(range.minlen, minlen);
526 ret = btrfs_trim_fs(fs_info, &range);
530 if (copy_to_user(arg, &range, sizeof(range)))
536 int __pure btrfs_is_empty_uuid(u8 *uuid)
540 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
547 static noinline int create_subvol(struct user_namespace *mnt_userns,
548 struct inode *dir, struct dentry *dentry,
549 const char *name, int namelen,
550 struct btrfs_qgroup_inherit *inherit)
552 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
553 struct btrfs_trans_handle *trans;
554 struct btrfs_key key;
555 struct btrfs_root_item *root_item;
556 struct btrfs_inode_item *inode_item;
557 struct extent_buffer *leaf;
558 struct btrfs_root *root = BTRFS_I(dir)->root;
559 struct btrfs_root *new_root;
560 struct btrfs_block_rsv block_rsv;
561 struct timespec64 cur_time = current_time(dir);
568 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
572 ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid);
576 ret = get_anon_bdev(&anon_dev);
581 * Don't create subvolume whose level is not zero. Or qgroup will be
582 * screwed up since it assumes subvolume qgroup's level to be 0.
584 if (btrfs_qgroup_level(objectid)) {
589 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
591 * The same as the snapshot creation, please see the comment
592 * of create_snapshot().
594 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
598 trans = btrfs_start_transaction(root, 0);
600 ret = PTR_ERR(trans);
601 btrfs_subvolume_release_metadata(root, &block_rsv);
604 trans->block_rsv = &block_rsv;
605 trans->bytes_reserved = block_rsv.size;
607 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
611 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
612 BTRFS_NESTING_NORMAL);
618 btrfs_mark_buffer_dirty(leaf);
620 inode_item = &root_item->inode;
621 btrfs_set_stack_inode_generation(inode_item, 1);
622 btrfs_set_stack_inode_size(inode_item, 3);
623 btrfs_set_stack_inode_nlink(inode_item, 1);
624 btrfs_set_stack_inode_nbytes(inode_item,
626 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
628 btrfs_set_root_flags(root_item, 0);
629 btrfs_set_root_limit(root_item, 0);
630 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
632 btrfs_set_root_bytenr(root_item, leaf->start);
633 btrfs_set_root_generation(root_item, trans->transid);
634 btrfs_set_root_level(root_item, 0);
635 btrfs_set_root_refs(root_item, 1);
636 btrfs_set_root_used(root_item, leaf->len);
637 btrfs_set_root_last_snapshot(root_item, 0);
639 btrfs_set_root_generation_v2(root_item,
640 btrfs_root_generation(root_item));
641 generate_random_guid(root_item->uuid);
642 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
643 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
644 root_item->ctime = root_item->otime;
645 btrfs_set_root_ctransid(root_item, trans->transid);
646 btrfs_set_root_otransid(root_item, trans->transid);
648 btrfs_tree_unlock(leaf);
650 btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID);
652 key.objectid = objectid;
654 key.type = BTRFS_ROOT_ITEM_KEY;
655 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
659 * Since we don't abort the transaction in this case, free the
660 * tree block so that we don't leak space and leave the
661 * filesystem in an inconsistent state (an extent item in the
662 * extent tree with a backreference for a root that does not
665 btrfs_tree_lock(leaf);
666 btrfs_clean_tree_block(leaf);
667 btrfs_tree_unlock(leaf);
668 btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
669 free_extent_buffer(leaf);
673 free_extent_buffer(leaf);
676 key.offset = (u64)-1;
677 new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev);
678 if (IS_ERR(new_root)) {
679 free_anon_bdev(anon_dev);
680 ret = PTR_ERR(new_root);
681 btrfs_abort_transaction(trans, ret);
684 /* Freeing will be done in btrfs_put_root() of new_root */
687 ret = btrfs_record_root_in_trans(trans, new_root);
689 btrfs_put_root(new_root);
690 btrfs_abort_transaction(trans, ret);
694 ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns);
695 btrfs_put_root(new_root);
697 /* We potentially lose an unused inode item here */
698 btrfs_abort_transaction(trans, ret);
703 * insert the directory item
705 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
707 btrfs_abort_transaction(trans, ret);
711 ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
712 BTRFS_FT_DIR, index);
714 btrfs_abort_transaction(trans, ret);
718 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
719 ret = btrfs_update_inode(trans, root, BTRFS_I(dir));
721 btrfs_abort_transaction(trans, ret);
725 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
726 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
728 btrfs_abort_transaction(trans, ret);
732 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
733 BTRFS_UUID_KEY_SUBVOL, objectid);
735 btrfs_abort_transaction(trans, ret);
739 trans->block_rsv = NULL;
740 trans->bytes_reserved = 0;
741 btrfs_subvolume_release_metadata(root, &block_rsv);
744 btrfs_end_transaction(trans);
746 ret = btrfs_commit_transaction(trans);
749 inode = btrfs_lookup_dentry(dir, dentry);
751 return PTR_ERR(inode);
752 d_instantiate(dentry, inode);
758 free_anon_bdev(anon_dev);
763 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
764 struct dentry *dentry, bool readonly,
765 struct btrfs_qgroup_inherit *inherit)
767 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
769 struct btrfs_pending_snapshot *pending_snapshot;
770 struct btrfs_trans_handle *trans;
773 /* We do not support snapshotting right now. */
774 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
776 "extent tree v2 doesn't support snapshotting yet");
780 if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
783 if (atomic_read(&root->nr_swapfiles)) {
785 "cannot snapshot subvolume with active swapfile");
789 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
790 if (!pending_snapshot)
793 ret = get_anon_bdev(&pending_snapshot->anon_dev);
796 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
798 pending_snapshot->path = btrfs_alloc_path();
799 if (!pending_snapshot->root_item || !pending_snapshot->path) {
804 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
805 BTRFS_BLOCK_RSV_TEMP);
807 * 1 - parent dir inode
810 * 2 - root ref/backref
811 * 1 - root of snapshot
814 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
815 &pending_snapshot->block_rsv, 8,
820 pending_snapshot->dentry = dentry;
821 pending_snapshot->root = root;
822 pending_snapshot->readonly = readonly;
823 pending_snapshot->dir = dir;
824 pending_snapshot->inherit = inherit;
826 trans = btrfs_start_transaction(root, 0);
828 ret = PTR_ERR(trans);
832 trans->pending_snapshot = pending_snapshot;
834 ret = btrfs_commit_transaction(trans);
838 ret = pending_snapshot->error;
842 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
846 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
848 ret = PTR_ERR(inode);
852 d_instantiate(dentry, inode);
854 pending_snapshot->anon_dev = 0;
856 /* Prevent double freeing of anon_dev */
857 if (ret && pending_snapshot->snap)
858 pending_snapshot->snap->anon_dev = 0;
859 btrfs_put_root(pending_snapshot->snap);
860 btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv);
862 if (pending_snapshot->anon_dev)
863 free_anon_bdev(pending_snapshot->anon_dev);
864 kfree(pending_snapshot->root_item);
865 btrfs_free_path(pending_snapshot->path);
866 kfree(pending_snapshot);
871 /* copy of may_delete in fs/namei.c()
872 * Check whether we can remove a link victim from directory dir, check
873 * whether the type of victim is right.
874 * 1. We can't do it if dir is read-only (done in permission())
875 * 2. We should have write and exec permissions on dir
876 * 3. We can't remove anything from append-only dir
877 * 4. We can't do anything with immutable dir (done in permission())
878 * 5. If the sticky bit on dir is set we should either
879 * a. be owner of dir, or
880 * b. be owner of victim, or
881 * c. have CAP_FOWNER capability
882 * 6. If the victim is append-only or immutable we can't do anything with
883 * links pointing to it.
884 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
885 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
886 * 9. We can't remove a root or mountpoint.
887 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
888 * nfs_async_unlink().
891 static int btrfs_may_delete(struct user_namespace *mnt_userns,
892 struct inode *dir, struct dentry *victim, int isdir)
896 if (d_really_is_negative(victim))
899 BUG_ON(d_inode(victim->d_parent) != dir);
900 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
902 error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
907 if (check_sticky(mnt_userns, dir, d_inode(victim)) ||
908 IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
909 IS_SWAPFILE(d_inode(victim)))
912 if (!d_is_dir(victim))
916 } else if (d_is_dir(victim))
920 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
925 /* copy of may_create in fs/namei.c() */
926 static inline int btrfs_may_create(struct user_namespace *mnt_userns,
927 struct inode *dir, struct dentry *child)
929 if (d_really_is_positive(child))
933 if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns))
935 return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
939 * Create a new subvolume below @parent. This is largely modeled after
940 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
941 * inside this filesystem so it's quite a bit simpler.
943 static noinline int btrfs_mksubvol(const struct path *parent,
944 struct user_namespace *mnt_userns,
945 const char *name, int namelen,
946 struct btrfs_root *snap_src,
948 struct btrfs_qgroup_inherit *inherit)
950 struct inode *dir = d_inode(parent->dentry);
951 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
952 struct dentry *dentry;
955 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
959 dentry = lookup_one(mnt_userns, name, parent->dentry, namelen);
960 error = PTR_ERR(dentry);
964 error = btrfs_may_create(mnt_userns, dir, dentry);
969 * even if this name doesn't exist, we may get hash collisions.
970 * check for them now when we can safely fail
972 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
978 down_read(&fs_info->subvol_sem);
980 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
984 error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
986 error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit);
989 fsnotify_mkdir(dir, dentry);
991 up_read(&fs_info->subvol_sem);
995 btrfs_inode_unlock(dir, 0);
999 static noinline int btrfs_mksnapshot(const struct path *parent,
1000 struct user_namespace *mnt_userns,
1001 const char *name, int namelen,
1002 struct btrfs_root *root,
1004 struct btrfs_qgroup_inherit *inherit)
1007 bool snapshot_force_cow = false;
1010 * Force new buffered writes to reserve space even when NOCOW is
1011 * possible. This is to avoid later writeback (running dealloc) to
1012 * fallback to COW mode and unexpectedly fail with ENOSPC.
1014 btrfs_drew_read_lock(&root->snapshot_lock);
1016 ret = btrfs_start_delalloc_snapshot(root, false);
1021 * All previous writes have started writeback in NOCOW mode, so now
1022 * we force future writes to fallback to COW mode during snapshot
1025 atomic_inc(&root->snapshot_force_cow);
1026 snapshot_force_cow = true;
1028 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
1030 ret = btrfs_mksubvol(parent, mnt_userns, name, namelen,
1031 root, readonly, inherit);
1033 if (snapshot_force_cow)
1034 atomic_dec(&root->snapshot_force_cow);
1035 btrfs_drew_read_unlock(&root->snapshot_lock);
1040 * Defrag specific helper to get an extent map.
1042 * Differences between this and btrfs_get_extent() are:
1044 * - No extent_map will be added to inode->extent_tree
1045 * To reduce memory usage in the long run.
1047 * - Extra optimization to skip file extents older than @newer_than
1048 * By using btrfs_search_forward() we can skip entire file ranges that
1049 * have extents created in past transactions, because btrfs_search_forward()
1050 * will not visit leaves and nodes with a generation smaller than given
1051 * minimal generation threshold (@newer_than).
1053 * Return valid em if we find a file extent matching the requirement.
1054 * Return NULL if we can not find a file extent matching the requirement.
1056 * Return ERR_PTR() for error.
1058 static struct extent_map *defrag_get_extent(struct btrfs_inode *inode,
1059 u64 start, u64 newer_than)
1061 struct btrfs_root *root = inode->root;
1062 struct btrfs_file_extent_item *fi;
1063 struct btrfs_path path = { 0 };
1064 struct extent_map *em;
1065 struct btrfs_key key;
1066 u64 ino = btrfs_ino(inode);
1069 em = alloc_extent_map();
1076 key.type = BTRFS_EXTENT_DATA_KEY;
1080 ret = btrfs_search_forward(root, &key, &path, newer_than);
1083 /* Can't find anything newer */
1087 ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1091 if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) {
1093 * If btrfs_search_slot() makes path to point beyond nritems,
1094 * we should not have an empty leaf, as this inode must at
1095 * least have its INODE_ITEM.
1097 ASSERT(btrfs_header_nritems(path.nodes[0]));
1098 path.slots[0] = btrfs_header_nritems(path.nodes[0]) - 1;
1100 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
1101 /* Perfect match, no need to go one slot back */
1102 if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY &&
1103 key.offset == start)
1106 /* We didn't find a perfect match, needs to go one slot back */
1107 if (path.slots[0] > 0) {
1108 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
1109 if (key.objectid == ino && key.type == BTRFS_EXTENT_DATA_KEY)
1114 /* Iterate through the path to find a file extent covering @start */
1118 if (path.slots[0] >= btrfs_header_nritems(path.nodes[0]))
1121 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
1124 * We may go one slot back to INODE_REF/XATTR item, then
1125 * need to go forward until we reach an EXTENT_DATA.
1126 * But we should still has the correct ino as key.objectid.
1128 if (WARN_ON(key.objectid < ino) || key.type < BTRFS_EXTENT_DATA_KEY)
1131 /* It's beyond our target range, definitely not extent found */
1132 if (key.objectid > ino || key.type > BTRFS_EXTENT_DATA_KEY)
1136 * | |<- File extent ->|
1139 * This means there is a hole between start and key.offset.
1141 if (key.offset > start) {
1143 em->orig_start = start;
1144 em->block_start = EXTENT_MAP_HOLE;
1145 em->len = key.offset - start;
1149 fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
1150 struct btrfs_file_extent_item);
1151 extent_end = btrfs_file_extent_end(&path);
1154 * |<- file extent ->| |
1157 * We haven't reached start, search next slot.
1159 if (extent_end <= start)
1162 /* Now this extent covers @start, convert it to em */
1163 btrfs_extent_item_to_extent_map(inode, &path, fi, false, em);
1166 ret = btrfs_next_item(root, &path);
1172 btrfs_release_path(&path);
1176 btrfs_release_path(&path);
1177 free_extent_map(em);
1181 btrfs_release_path(&path);
1182 free_extent_map(em);
1183 return ERR_PTR(ret);
1186 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start,
1187 u64 newer_than, bool locked)
1189 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1190 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1191 struct extent_map *em;
1192 const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize;
1195 * hopefully we have this extent in the tree already, try without
1196 * the full extent lock
1198 read_lock(&em_tree->lock);
1199 em = lookup_extent_mapping(em_tree, start, sectorsize);
1200 read_unlock(&em_tree->lock);
1203 * We can get a merged extent, in that case, we need to re-search
1204 * tree to get the original em for defrag.
1206 * If @newer_than is 0 or em::generation < newer_than, we can trust
1207 * this em, as either we don't care about the generation, or the
1208 * merged extent map will be rejected anyway.
1210 if (em && test_bit(EXTENT_FLAG_MERGED, &em->flags) &&
1211 newer_than && em->generation >= newer_than) {
1212 free_extent_map(em);
1217 struct extent_state *cached = NULL;
1218 u64 end = start + sectorsize - 1;
1220 /* get the big lock and read metadata off disk */
1222 lock_extent_bits(io_tree, start, end, &cached);
1223 em = defrag_get_extent(BTRFS_I(inode), start, newer_than);
1225 unlock_extent_cached(io_tree, start, end, &cached);
1234 static u32 get_extent_max_capacity(const struct extent_map *em)
1236 if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
1237 return BTRFS_MAX_COMPRESSED;
1238 return BTRFS_MAX_EXTENT_SIZE;
1241 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em,
1244 struct extent_map *next;
1247 /* this is the last extent */
1248 if (em->start + em->len >= i_size_read(inode))
1252 * We want to check if the next extent can be merged with the current
1253 * one, which can be an extent created in a past generation, so we pass
1254 * a minimum generation of 0 to defrag_lookup_extent().
1256 next = defrag_lookup_extent(inode, em->start + em->len, 0, locked);
1257 /* No more em or hole */
1258 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1260 if (test_bit(EXTENT_FLAG_PREALLOC, &next->flags))
1263 * If the next extent is at its max capacity, defragging current extent
1264 * makes no sense, as the total number of extents won't change.
1266 if (next->len >= get_extent_max_capacity(em))
1270 free_extent_map(next);
1275 * Prepare one page to be defragged.
1279 * - Returned page is locked and has been set up properly.
1280 * - No ordered extent exists in the page.
1281 * - The page is uptodate.
1283 * NOTE: Caller should also wait for page writeback after the cluster is
1284 * prepared, here we don't do writeback wait for each page.
1286 static struct page *defrag_prepare_one_page(struct btrfs_inode *inode,
1289 struct address_space *mapping = inode->vfs_inode.i_mapping;
1290 gfp_t mask = btrfs_alloc_write_mask(mapping);
1291 u64 page_start = (u64)index << PAGE_SHIFT;
1292 u64 page_end = page_start + PAGE_SIZE - 1;
1293 struct extent_state *cached_state = NULL;
1298 page = find_or_create_page(mapping, index, mask);
1300 return ERR_PTR(-ENOMEM);
1303 * Since we can defragment files opened read-only, we can encounter
1304 * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We
1305 * can't do I/O using huge pages yet, so return an error for now.
1306 * Filesystem transparent huge pages are typically only used for
1307 * executables that explicitly enable them, so this isn't very
1310 if (PageCompound(page)) {
1313 return ERR_PTR(-ETXTBSY);
1316 ret = set_page_extent_mapped(page);
1320 return ERR_PTR(ret);
1323 /* Wait for any existing ordered extent in the range */
1325 struct btrfs_ordered_extent *ordered;
1327 lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state);
1328 ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE);
1329 unlock_extent_cached(&inode->io_tree, page_start, page_end,
1335 btrfs_start_ordered_extent(ordered, 1);
1336 btrfs_put_ordered_extent(ordered);
1339 * We unlocked the page above, so we need check if it was
1342 if (page->mapping != mapping || !PagePrivate(page)) {
1350 * Now the page range has no ordered extent any more. Read the page to
1353 if (!PageUptodate(page)) {
1354 btrfs_readpage(NULL, page);
1356 if (page->mapping != mapping || !PagePrivate(page)) {
1361 if (!PageUptodate(page)) {
1364 return ERR_PTR(-EIO);
1370 struct defrag_target_range {
1371 struct list_head list;
1377 * Collect all valid target extents.
1379 * @start: file offset to lookup
1380 * @len: length to lookup
1381 * @extent_thresh: file extent size threshold, any extent size >= this value
1383 * @newer_than: only defrag extents newer than this value
1384 * @do_compress: whether the defrag is doing compression
1385 * if true, @extent_thresh will be ignored and all regular
1386 * file extents meeting @newer_than will be targets.
1387 * @locked: if the range has already held extent lock
1388 * @target_list: list of targets file extents
1390 static int defrag_collect_targets(struct btrfs_inode *inode,
1391 u64 start, u64 len, u32 extent_thresh,
1392 u64 newer_than, bool do_compress,
1393 bool locked, struct list_head *target_list,
1394 u64 *last_scanned_ret)
1396 bool last_is_target = false;
1400 while (cur < start + len) {
1401 struct extent_map *em;
1402 struct defrag_target_range *new;
1403 bool next_mergeable = true;
1406 last_is_target = false;
1407 em = defrag_lookup_extent(&inode->vfs_inode, cur,
1408 newer_than, locked);
1412 /* Skip hole/inline/preallocated extents */
1413 if (em->block_start >= EXTENT_MAP_LAST_BYTE ||
1414 test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
1417 /* Skip older extent */
1418 if (em->generation < newer_than)
1421 /* This em is under writeback, no need to defrag */
1422 if (em->generation == (u64)-1)
1426 * Our start offset might be in the middle of an existing extent
1427 * map, so take that into account.
1429 range_len = em->len - (cur - em->start);
1431 * If this range of the extent map is already flagged for delalloc,
1434 * 1) We could deadlock later, when trying to reserve space for
1435 * delalloc, because in case we can't immediately reserve space
1436 * the flusher can start delalloc and wait for the respective
1437 * ordered extents to complete. The deadlock would happen
1438 * because we do the space reservation while holding the range
1439 * locked, and starting writeback, or finishing an ordered
1440 * extent, requires locking the range;
1442 * 2) If there's delalloc there, it means there's dirty pages for
1443 * which writeback has not started yet (we clean the delalloc
1444 * flag when starting writeback and after creating an ordered
1445 * extent). If we mark pages in an adjacent range for defrag,
1446 * then we will have a larger contiguous range for delalloc,
1447 * very likely resulting in a larger extent after writeback is
1448 * triggered (except in a case of free space fragmentation).
1450 if (test_range_bit(&inode->io_tree, cur, cur + range_len - 1,
1451 EXTENT_DELALLOC, 0, NULL))
1455 * For do_compress case, we want to compress all valid file
1456 * extents, thus no @extent_thresh or mergeable check.
1461 /* Skip too large extent */
1462 if (range_len >= extent_thresh)
1466 * Skip extents already at its max capacity, this is mostly for
1467 * compressed extents, which max cap is only 128K.
1469 if (em->len >= get_extent_max_capacity(em))
1472 next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em,
1474 if (!next_mergeable) {
1475 struct defrag_target_range *last;
1477 /* Empty target list, no way to merge with last entry */
1478 if (list_empty(target_list))
1480 last = list_entry(target_list->prev,
1481 struct defrag_target_range, list);
1482 /* Not mergeable with last entry */
1483 if (last->start + last->len != cur)
1486 /* Mergeable, fall through to add it to @target_list. */
1490 last_is_target = true;
1491 range_len = min(extent_map_end(em), start + len) - cur;
1493 * This one is a good target, check if it can be merged into
1494 * last range of the target list.
1496 if (!list_empty(target_list)) {
1497 struct defrag_target_range *last;
1499 last = list_entry(target_list->prev,
1500 struct defrag_target_range, list);
1501 ASSERT(last->start + last->len <= cur);
1502 if (last->start + last->len == cur) {
1503 /* Mergeable, enlarge the last entry */
1504 last->len += range_len;
1507 /* Fall through to allocate a new entry */
1510 /* Allocate new defrag_target_range */
1511 new = kmalloc(sizeof(*new), GFP_NOFS);
1513 free_extent_map(em);
1518 new->len = range_len;
1519 list_add_tail(&new->list, target_list);
1522 cur = extent_map_end(em);
1523 free_extent_map(em);
1526 struct defrag_target_range *entry;
1527 struct defrag_target_range *tmp;
1529 list_for_each_entry_safe(entry, tmp, target_list, list) {
1530 list_del_init(&entry->list);
1534 if (!ret && last_scanned_ret) {
1536 * If the last extent is not a target, the caller can skip to
1537 * the end of that extent.
1538 * Otherwise, we can only go the end of the specified range.
1540 if (!last_is_target)
1541 *last_scanned_ret = max(cur, *last_scanned_ret);
1543 *last_scanned_ret = max(start + len, *last_scanned_ret);
1548 #define CLUSTER_SIZE (SZ_256K)
1549 static_assert(IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE));
1552 * Defrag one contiguous target range.
1554 * @inode: target inode
1555 * @target: target range to defrag
1556 * @pages: locked pages covering the defrag range
1557 * @nr_pages: number of locked pages
1559 * Caller should ensure:
1561 * - Pages are prepared
1562 * Pages should be locked, no ordered extent in the pages range,
1565 * - Extent bits are locked
1567 static int defrag_one_locked_target(struct btrfs_inode *inode,
1568 struct defrag_target_range *target,
1569 struct page **pages, int nr_pages,
1570 struct extent_state **cached_state)
1572 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1573 struct extent_changeset *data_reserved = NULL;
1574 const u64 start = target->start;
1575 const u64 len = target->len;
1576 unsigned long last_index = (start + len - 1) >> PAGE_SHIFT;
1577 unsigned long start_index = start >> PAGE_SHIFT;
1578 unsigned long first_index = page_index(pages[0]);
1582 ASSERT(last_index - first_index + 1 <= nr_pages);
1584 ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len);
1587 clear_extent_bit(&inode->io_tree, start, start + len - 1,
1588 EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
1589 EXTENT_DEFRAG, 0, 0, cached_state);
1590 set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state);
1592 /* Update the page status */
1593 for (i = start_index - first_index; i <= last_index - first_index; i++) {
1594 ClearPageChecked(pages[i]);
1595 btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len);
1597 btrfs_delalloc_release_extents(inode, len);
1598 extent_changeset_free(data_reserved);
1603 static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len,
1604 u32 extent_thresh, u64 newer_than, bool do_compress,
1605 u64 *last_scanned_ret)
1607 struct extent_state *cached_state = NULL;
1608 struct defrag_target_range *entry;
1609 struct defrag_target_range *tmp;
1610 LIST_HEAD(target_list);
1611 struct page **pages;
1612 const u32 sectorsize = inode->root->fs_info->sectorsize;
1613 u64 last_index = (start + len - 1) >> PAGE_SHIFT;
1614 u64 start_index = start >> PAGE_SHIFT;
1615 unsigned int nr_pages = last_index - start_index + 1;
1619 ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE);
1620 ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize));
1622 pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
1626 /* Prepare all pages */
1627 for (i = 0; i < nr_pages; i++) {
1628 pages[i] = defrag_prepare_one_page(inode, start_index + i);
1629 if (IS_ERR(pages[i])) {
1630 ret = PTR_ERR(pages[i]);
1635 for (i = 0; i < nr_pages; i++)
1636 wait_on_page_writeback(pages[i]);
1638 /* Lock the pages range */
1639 lock_extent_bits(&inode->io_tree, start_index << PAGE_SHIFT,
1640 (last_index << PAGE_SHIFT) + PAGE_SIZE - 1,
1643 * Now we have a consistent view about the extent map, re-check
1644 * which range really needs to be defragged.
1646 * And this time we have extent locked already, pass @locked = true
1647 * so that we won't relock the extent range and cause deadlock.
1649 ret = defrag_collect_targets(inode, start, len, extent_thresh,
1650 newer_than, do_compress, true,
1651 &target_list, last_scanned_ret);
1655 list_for_each_entry(entry, &target_list, list) {
1656 ret = defrag_one_locked_target(inode, entry, pages, nr_pages,
1662 list_for_each_entry_safe(entry, tmp, &target_list, list) {
1663 list_del_init(&entry->list);
1667 unlock_extent_cached(&inode->io_tree, start_index << PAGE_SHIFT,
1668 (last_index << PAGE_SHIFT) + PAGE_SIZE - 1,
1671 for (i = 0; i < nr_pages; i++) {
1673 unlock_page(pages[i]);
1681 static int defrag_one_cluster(struct btrfs_inode *inode,
1682 struct file_ra_state *ra,
1683 u64 start, u32 len, u32 extent_thresh,
1684 u64 newer_than, bool do_compress,
1685 unsigned long *sectors_defragged,
1686 unsigned long max_sectors,
1687 u64 *last_scanned_ret)
1689 const u32 sectorsize = inode->root->fs_info->sectorsize;
1690 struct defrag_target_range *entry;
1691 struct defrag_target_range *tmp;
1692 LIST_HEAD(target_list);
1695 ret = defrag_collect_targets(inode, start, len, extent_thresh,
1696 newer_than, do_compress, false,
1697 &target_list, NULL);
1701 list_for_each_entry(entry, &target_list, list) {
1702 u32 range_len = entry->len;
1704 /* Reached or beyond the limit */
1705 if (max_sectors && *sectors_defragged >= max_sectors) {
1711 range_len = min_t(u32, range_len,
1712 (max_sectors - *sectors_defragged) * sectorsize);
1715 * If defrag_one_range() has updated last_scanned_ret,
1716 * our range may already be invalid (e.g. hole punched).
1717 * Skip if our range is before last_scanned_ret, as there is
1718 * no need to defrag the range anymore.
1720 if (entry->start + range_len <= *last_scanned_ret)
1724 page_cache_sync_readahead(inode->vfs_inode.i_mapping,
1725 ra, NULL, entry->start >> PAGE_SHIFT,
1726 ((entry->start + range_len - 1) >> PAGE_SHIFT) -
1727 (entry->start >> PAGE_SHIFT) + 1);
1729 * Here we may not defrag any range if holes are punched before
1730 * we locked the pages.
1731 * But that's fine, it only affects the @sectors_defragged
1734 ret = defrag_one_range(inode, entry->start, range_len,
1735 extent_thresh, newer_than, do_compress,
1739 *sectors_defragged += range_len >>
1740 inode->root->fs_info->sectorsize_bits;
1743 list_for_each_entry_safe(entry, tmp, &target_list, list) {
1744 list_del_init(&entry->list);
1748 *last_scanned_ret = max(*last_scanned_ret, start + len);
1753 * Entry point to file defragmentation.
1755 * @inode: inode to be defragged
1756 * @ra: readahead state (can be NUL)
1757 * @range: defrag options including range and flags
1758 * @newer_than: minimum transid to defrag
1759 * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode
1760 * will be defragged.
1762 * Return <0 for error.
1763 * Return >=0 for the number of sectors defragged, and range->start will be updated
1764 * to indicate the file offset where next defrag should be started at.
1765 * (Mostly for autodefrag, which sets @max_to_defrag thus we may exit early without
1766 * defragging all the range).
1768 int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
1769 struct btrfs_ioctl_defrag_range_args *range,
1770 u64 newer_than, unsigned long max_to_defrag)
1772 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1773 unsigned long sectors_defragged = 0;
1774 u64 isize = i_size_read(inode);
1777 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
1778 bool ra_allocated = false;
1779 int compress_type = BTRFS_COMPRESS_ZLIB;
1781 u32 extent_thresh = range->extent_thresh;
1782 pgoff_t start_index;
1787 if (range->start >= isize)
1791 if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES)
1793 if (range->compress_type)
1794 compress_type = range->compress_type;
1797 if (extent_thresh == 0)
1798 extent_thresh = SZ_256K;
1800 if (range->start + range->len > range->start) {
1801 /* Got a specific range */
1802 last_byte = min(isize, range->start + range->len);
1804 /* Defrag until file end */
1808 /* Align the range */
1809 cur = round_down(range->start, fs_info->sectorsize);
1810 last_byte = round_up(last_byte, fs_info->sectorsize) - 1;
1813 * If we were not given a ra, allocate a readahead context. As
1814 * readahead is just an optimization, defrag will work without it so
1815 * we don't error out.
1818 ra_allocated = true;
1819 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1821 file_ra_state_init(ra, inode->i_mapping);
1825 * Make writeback start from the beginning of the range, so that the
1826 * defrag range can be written sequentially.
1828 start_index = cur >> PAGE_SHIFT;
1829 if (start_index < inode->i_mapping->writeback_index)
1830 inode->i_mapping->writeback_index = start_index;
1832 while (cur < last_byte) {
1833 const unsigned long prev_sectors_defragged = sectors_defragged;
1834 u64 last_scanned = cur;
1837 if (btrfs_defrag_cancelled(fs_info)) {
1842 /* We want the cluster end at page boundary when possible */
1843 cluster_end = (((cur >> PAGE_SHIFT) +
1844 (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1;
1845 cluster_end = min(cluster_end, last_byte);
1847 btrfs_inode_lock(inode, 0);
1848 if (IS_SWAPFILE(inode)) {
1850 btrfs_inode_unlock(inode, 0);
1853 if (!(inode->i_sb->s_flags & SB_ACTIVE)) {
1854 btrfs_inode_unlock(inode, 0);
1858 BTRFS_I(inode)->defrag_compress = compress_type;
1859 ret = defrag_one_cluster(BTRFS_I(inode), ra, cur,
1860 cluster_end + 1 - cur, extent_thresh,
1861 newer_than, do_compress, §ors_defragged,
1862 max_to_defrag, &last_scanned);
1864 if (sectors_defragged > prev_sectors_defragged)
1865 balance_dirty_pages_ratelimited(inode->i_mapping);
1867 btrfs_inode_unlock(inode, 0);
1870 cur = max(cluster_end + 1, last_scanned);
1881 * Update range.start for autodefrag, this will indicate where to start
1885 if (sectors_defragged) {
1887 * We have defragged some sectors, for compression case they
1888 * need to be written back immediately.
1890 if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) {
1891 filemap_flush(inode->i_mapping);
1892 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1893 &BTRFS_I(inode)->runtime_flags))
1894 filemap_flush(inode->i_mapping);
1896 if (range->compress_type == BTRFS_COMPRESS_LZO)
1897 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1898 else if (range->compress_type == BTRFS_COMPRESS_ZSTD)
1899 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1900 ret = sectors_defragged;
1903 btrfs_inode_lock(inode, 0);
1904 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
1905 btrfs_inode_unlock(inode, 0);
1911 * Try to start exclusive operation @type or cancel it if it's running.
1914 * 0 - normal mode, newly claimed op started
1915 * >0 - normal mode, something else is running,
1916 * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space
1917 * ECANCELED - cancel mode, successful cancel
1918 * ENOTCONN - cancel mode, operation not running anymore
1920 static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info,
1921 enum btrfs_exclusive_operation type, bool cancel)
1924 /* Start normal op */
1925 if (!btrfs_exclop_start(fs_info, type))
1926 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1927 /* Exclusive operation is now claimed */
1931 /* Cancel running op */
1932 if (btrfs_exclop_start_try_lock(fs_info, type)) {
1934 * This blocks any exclop finish from setting it to NONE, so we
1935 * request cancellation. Either it runs and we will wait for it,
1936 * or it has finished and no waiting will happen.
1938 atomic_inc(&fs_info->reloc_cancel_req);
1939 btrfs_exclop_start_unlock(fs_info);
1941 if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags))
1942 wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING,
1943 TASK_INTERRUPTIBLE);
1948 /* Something else is running or none */
1952 static noinline int btrfs_ioctl_resize(struct file *file,
1955 BTRFS_DEV_LOOKUP_ARGS(args);
1956 struct inode *inode = file_inode(file);
1957 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1961 struct btrfs_root *root = BTRFS_I(inode)->root;
1962 struct btrfs_ioctl_vol_args *vol_args;
1963 struct btrfs_trans_handle *trans;
1964 struct btrfs_device *device = NULL;
1967 char *devstr = NULL;
1972 if (!capable(CAP_SYS_ADMIN))
1975 ret = mnt_want_write_file(file);
1980 * Read the arguments before checking exclusivity to be able to
1981 * distinguish regular resize and cancel
1983 vol_args = memdup_user(arg, sizeof(*vol_args));
1984 if (IS_ERR(vol_args)) {
1985 ret = PTR_ERR(vol_args);
1988 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1989 sizestr = vol_args->name;
1990 cancel = (strcmp("cancel", sizestr) == 0);
1991 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel);
1994 /* Exclusive operation is now claimed */
1996 devstr = strchr(sizestr, ':');
1998 sizestr = devstr + 1;
2000 devstr = vol_args->name;
2001 ret = kstrtoull(devstr, 10, &devid);
2008 btrfs_info(fs_info, "resizing devid %llu", devid);
2012 device = btrfs_find_device(fs_info->fs_devices, &args);
2014 btrfs_info(fs_info, "resizer unable to find device %llu",
2020 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
2022 "resizer unable to apply on readonly device %llu",
2028 if (!strcmp(sizestr, "max"))
2029 new_size = bdev_nr_bytes(device->bdev);
2031 if (sizestr[0] == '-') {
2034 } else if (sizestr[0] == '+') {
2038 new_size = memparse(sizestr, &retptr);
2039 if (*retptr != '\0' || new_size == 0) {
2045 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
2050 old_size = btrfs_device_get_total_bytes(device);
2053 if (new_size > old_size) {
2057 new_size = old_size - new_size;
2058 } else if (mod > 0) {
2059 if (new_size > ULLONG_MAX - old_size) {
2063 new_size = old_size + new_size;
2066 if (new_size < SZ_256M) {
2070 if (new_size > bdev_nr_bytes(device->bdev)) {
2075 new_size = round_down(new_size, fs_info->sectorsize);
2077 if (new_size > old_size) {
2078 trans = btrfs_start_transaction(root, 0);
2079 if (IS_ERR(trans)) {
2080 ret = PTR_ERR(trans);
2083 ret = btrfs_grow_device(trans, device, new_size);
2084 btrfs_commit_transaction(trans);
2085 } else if (new_size < old_size) {
2086 ret = btrfs_shrink_device(device, new_size);
2087 } /* equal, nothing need to do */
2089 if (ret == 0 && new_size != old_size)
2090 btrfs_info_in_rcu(fs_info,
2091 "resize device %s (devid %llu) from %llu to %llu",
2092 rcu_str_deref(device->name), device->devid,
2093 old_size, new_size);
2095 btrfs_exclop_finish(fs_info);
2099 mnt_drop_write_file(file);
2103 static noinline int __btrfs_ioctl_snap_create(struct file *file,
2104 struct user_namespace *mnt_userns,
2105 const char *name, unsigned long fd, int subvol,
2107 struct btrfs_qgroup_inherit *inherit)
2112 if (!S_ISDIR(file_inode(file)->i_mode))
2115 ret = mnt_want_write_file(file);
2119 namelen = strlen(name);
2120 if (strchr(name, '/')) {
2122 goto out_drop_write;
2125 if (name[0] == '.' &&
2126 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
2128 goto out_drop_write;
2132 ret = btrfs_mksubvol(&file->f_path, mnt_userns, name,
2133 namelen, NULL, readonly, inherit);
2135 struct fd src = fdget(fd);
2136 struct inode *src_inode;
2139 goto out_drop_write;
2142 src_inode = file_inode(src.file);
2143 if (src_inode->i_sb != file_inode(file)->i_sb) {
2144 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
2145 "Snapshot src from another FS");
2147 } else if (!inode_owner_or_capable(mnt_userns, src_inode)) {
2149 * Subvolume creation is not restricted, but snapshots
2150 * are limited to own subvolumes only
2154 ret = btrfs_mksnapshot(&file->f_path, mnt_userns,
2156 BTRFS_I(src_inode)->root,
2162 mnt_drop_write_file(file);
2167 static noinline int btrfs_ioctl_snap_create(struct file *file,
2168 void __user *arg, int subvol)
2170 struct btrfs_ioctl_vol_args *vol_args;
2173 if (!S_ISDIR(file_inode(file)->i_mode))
2176 vol_args = memdup_user(arg, sizeof(*vol_args));
2177 if (IS_ERR(vol_args))
2178 return PTR_ERR(vol_args);
2179 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2181 ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file),
2182 vol_args->name, vol_args->fd, subvol,
2189 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
2190 void __user *arg, int subvol)
2192 struct btrfs_ioctl_vol_args_v2 *vol_args;
2194 bool readonly = false;
2195 struct btrfs_qgroup_inherit *inherit = NULL;
2197 if (!S_ISDIR(file_inode(file)->i_mode))
2200 vol_args = memdup_user(arg, sizeof(*vol_args));
2201 if (IS_ERR(vol_args))
2202 return PTR_ERR(vol_args);
2203 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
2205 if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
2210 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
2212 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
2215 if (vol_args->size < sizeof(*inherit) ||
2216 vol_args->size > PAGE_SIZE) {
2220 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
2221 if (IS_ERR(inherit)) {
2222 ret = PTR_ERR(inherit);
2226 if (inherit->num_qgroups > PAGE_SIZE ||
2227 inherit->num_ref_copies > PAGE_SIZE ||
2228 inherit->num_excl_copies > PAGE_SIZE) {
2233 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
2234 2 * inherit->num_excl_copies;
2235 if (vol_args->size != struct_size(inherit, qgroups, nums)) {
2241 ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file),
2242 vol_args->name, vol_args->fd, subvol,
2253 static noinline int btrfs_ioctl_subvol_getflags(struct inode *inode,
2256 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2257 struct btrfs_root *root = BTRFS_I(inode)->root;
2261 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
2264 down_read(&fs_info->subvol_sem);
2265 if (btrfs_root_readonly(root))
2266 flags |= BTRFS_SUBVOL_RDONLY;
2267 up_read(&fs_info->subvol_sem);
2269 if (copy_to_user(arg, &flags, sizeof(flags)))
2275 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
2278 struct inode *inode = file_inode(file);
2279 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2280 struct btrfs_root *root = BTRFS_I(inode)->root;
2281 struct btrfs_trans_handle *trans;
2286 if (!inode_owner_or_capable(file_mnt_user_ns(file), inode))
2289 ret = mnt_want_write_file(file);
2293 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2295 goto out_drop_write;
2298 if (copy_from_user(&flags, arg, sizeof(flags))) {
2300 goto out_drop_write;
2303 if (flags & ~BTRFS_SUBVOL_RDONLY) {
2305 goto out_drop_write;
2308 down_write(&fs_info->subvol_sem);
2311 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
2314 root_flags = btrfs_root_flags(&root->root_item);
2315 if (flags & BTRFS_SUBVOL_RDONLY) {
2316 btrfs_set_root_flags(&root->root_item,
2317 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2320 * Block RO -> RW transition if this subvolume is involved in
2323 spin_lock(&root->root_item_lock);
2324 if (root->send_in_progress == 0) {
2325 btrfs_set_root_flags(&root->root_item,
2326 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2327 spin_unlock(&root->root_item_lock);
2329 spin_unlock(&root->root_item_lock);
2331 "Attempt to set subvolume %llu read-write during send",
2332 root->root_key.objectid);
2338 trans = btrfs_start_transaction(root, 1);
2339 if (IS_ERR(trans)) {
2340 ret = PTR_ERR(trans);
2344 ret = btrfs_update_root(trans, fs_info->tree_root,
2345 &root->root_key, &root->root_item);
2347 btrfs_end_transaction(trans);
2351 ret = btrfs_commit_transaction(trans);
2355 btrfs_set_root_flags(&root->root_item, root_flags);
2357 up_write(&fs_info->subvol_sem);
2359 mnt_drop_write_file(file);
2364 static noinline int key_in_sk(struct btrfs_key *key,
2365 struct btrfs_ioctl_search_key *sk)
2367 struct btrfs_key test;
2370 test.objectid = sk->min_objectid;
2371 test.type = sk->min_type;
2372 test.offset = sk->min_offset;
2374 ret = btrfs_comp_cpu_keys(key, &test);
2378 test.objectid = sk->max_objectid;
2379 test.type = sk->max_type;
2380 test.offset = sk->max_offset;
2382 ret = btrfs_comp_cpu_keys(key, &test);
2388 static noinline int copy_to_sk(struct btrfs_path *path,
2389 struct btrfs_key *key,
2390 struct btrfs_ioctl_search_key *sk,
2393 unsigned long *sk_offset,
2397 struct extent_buffer *leaf;
2398 struct btrfs_ioctl_search_header sh;
2399 struct btrfs_key test;
2400 unsigned long item_off;
2401 unsigned long item_len;
2407 leaf = path->nodes[0];
2408 slot = path->slots[0];
2409 nritems = btrfs_header_nritems(leaf);
2411 if (btrfs_header_generation(leaf) > sk->max_transid) {
2415 found_transid = btrfs_header_generation(leaf);
2417 for (i = slot; i < nritems; i++) {
2418 item_off = btrfs_item_ptr_offset(leaf, i);
2419 item_len = btrfs_item_size(leaf, i);
2421 btrfs_item_key_to_cpu(leaf, key, i);
2422 if (!key_in_sk(key, sk))
2425 if (sizeof(sh) + item_len > *buf_size) {
2432 * return one empty item back for v1, which does not
2436 *buf_size = sizeof(sh) + item_len;
2441 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2446 sh.objectid = key->objectid;
2447 sh.offset = key->offset;
2448 sh.type = key->type;
2450 sh.transid = found_transid;
2453 * Copy search result header. If we fault then loop again so we
2454 * can fault in the pages and -EFAULT there if there's a
2455 * problem. Otherwise we'll fault and then copy the buffer in
2456 * properly this next time through
2458 if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
2463 *sk_offset += sizeof(sh);
2466 char __user *up = ubuf + *sk_offset;
2468 * Copy the item, same behavior as above, but reset the
2469 * * sk_offset so we copy the full thing again.
2471 if (read_extent_buffer_to_user_nofault(leaf, up,
2472 item_off, item_len)) {
2474 *sk_offset -= sizeof(sh);
2478 *sk_offset += item_len;
2482 if (ret) /* -EOVERFLOW from above */
2485 if (*num_found >= sk->nr_items) {
2492 test.objectid = sk->max_objectid;
2493 test.type = sk->max_type;
2494 test.offset = sk->max_offset;
2495 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2497 else if (key->offset < (u64)-1)
2499 else if (key->type < (u8)-1) {
2502 } else if (key->objectid < (u64)-1) {
2510 * 0: all items from this leaf copied, continue with next
2511 * 1: * more items can be copied, but unused buffer is too small
2512 * * all items were found
2513 * Either way, it will stops the loop which iterates to the next
2515 * -EOVERFLOW: item was to large for buffer
2516 * -EFAULT: could not copy extent buffer back to userspace
2521 static noinline int search_ioctl(struct inode *inode,
2522 struct btrfs_ioctl_search_key *sk,
2526 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
2527 struct btrfs_root *root;
2528 struct btrfs_key key;
2529 struct btrfs_path *path;
2532 unsigned long sk_offset = 0;
2534 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2535 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2539 path = btrfs_alloc_path();
2543 if (sk->tree_id == 0) {
2544 /* search the root of the inode that was passed */
2545 root = btrfs_grab_root(BTRFS_I(inode)->root);
2547 root = btrfs_get_fs_root(info, sk->tree_id, true);
2549 btrfs_free_path(path);
2550 return PTR_ERR(root);
2554 key.objectid = sk->min_objectid;
2555 key.type = sk->min_type;
2556 key.offset = sk->min_offset;
2560 if (fault_in_writeable(ubuf + sk_offset, *buf_size - sk_offset))
2563 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2569 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
2570 &sk_offset, &num_found);
2571 btrfs_release_path(path);
2579 sk->nr_items = num_found;
2580 btrfs_put_root(root);
2581 btrfs_free_path(path);
2585 static noinline int btrfs_ioctl_tree_search(struct inode *inode,
2588 struct btrfs_ioctl_search_args __user *uargs;
2589 struct btrfs_ioctl_search_key sk;
2593 if (!capable(CAP_SYS_ADMIN))
2596 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2598 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2601 buf_size = sizeof(uargs->buf);
2603 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2606 * In the origin implementation an overflow is handled by returning a
2607 * search header with a len of zero, so reset ret.
2609 if (ret == -EOVERFLOW)
2612 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2617 static noinline int btrfs_ioctl_tree_search_v2(struct inode *inode,
2620 struct btrfs_ioctl_search_args_v2 __user *uarg;
2621 struct btrfs_ioctl_search_args_v2 args;
2624 const size_t buf_limit = SZ_16M;
2626 if (!capable(CAP_SYS_ADMIN))
2629 /* copy search header and buffer size */
2630 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2631 if (copy_from_user(&args, uarg, sizeof(args)))
2634 buf_size = args.buf_size;
2636 /* limit result size to 16MB */
2637 if (buf_size > buf_limit)
2638 buf_size = buf_limit;
2640 ret = search_ioctl(inode, &args.key, &buf_size,
2641 (char __user *)(&uarg->buf[0]));
2642 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2644 else if (ret == -EOVERFLOW &&
2645 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2652 * Search INODE_REFs to identify path name of 'dirid' directory
2653 * in a 'tree_id' tree. and sets path name to 'name'.
2655 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2656 u64 tree_id, u64 dirid, char *name)
2658 struct btrfs_root *root;
2659 struct btrfs_key key;
2665 struct btrfs_inode_ref *iref;
2666 struct extent_buffer *l;
2667 struct btrfs_path *path;
2669 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2674 path = btrfs_alloc_path();
2678 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
2680 root = btrfs_get_fs_root(info, tree_id, true);
2682 ret = PTR_ERR(root);
2687 key.objectid = dirid;
2688 key.type = BTRFS_INODE_REF_KEY;
2689 key.offset = (u64)-1;
2692 ret = btrfs_search_backwards(root, &key, path);
2701 slot = path->slots[0];
2703 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2704 len = btrfs_inode_ref_name_len(l, iref);
2706 total_len += len + 1;
2708 ret = -ENAMETOOLONG;
2713 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2715 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2718 btrfs_release_path(path);
2719 key.objectid = key.offset;
2720 key.offset = (u64)-1;
2721 dirid = key.objectid;
2723 memmove(name, ptr, total_len);
2724 name[total_len] = '\0';
2727 btrfs_put_root(root);
2728 btrfs_free_path(path);
2732 static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns,
2733 struct inode *inode,
2734 struct btrfs_ioctl_ino_lookup_user_args *args)
2736 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2737 struct super_block *sb = inode->i_sb;
2738 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2739 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2740 u64 dirid = args->dirid;
2741 unsigned long item_off;
2742 unsigned long item_len;
2743 struct btrfs_inode_ref *iref;
2744 struct btrfs_root_ref *rref;
2745 struct btrfs_root *root = NULL;
2746 struct btrfs_path *path;
2747 struct btrfs_key key, key2;
2748 struct extent_buffer *leaf;
2749 struct inode *temp_inode;
2756 path = btrfs_alloc_path();
2761 * If the bottom subvolume does not exist directly under upper_limit,
2762 * construct the path in from the bottom up.
2764 if (dirid != upper_limit.objectid) {
2765 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2767 root = btrfs_get_fs_root(fs_info, treeid, true);
2769 ret = PTR_ERR(root);
2773 key.objectid = dirid;
2774 key.type = BTRFS_INODE_REF_KEY;
2775 key.offset = (u64)-1;
2777 ret = btrfs_search_backwards(root, &key, path);
2785 leaf = path->nodes[0];
2786 slot = path->slots[0];
2788 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2789 len = btrfs_inode_ref_name_len(leaf, iref);
2791 total_len += len + 1;
2792 if (ptr < args->path) {
2793 ret = -ENAMETOOLONG;
2798 read_extent_buffer(leaf, ptr,
2799 (unsigned long)(iref + 1), len);
2801 /* Check the read+exec permission of this directory */
2802 ret = btrfs_previous_item(root, path, dirid,
2803 BTRFS_INODE_ITEM_KEY);
2806 } else if (ret > 0) {
2811 leaf = path->nodes[0];
2812 slot = path->slots[0];
2813 btrfs_item_key_to_cpu(leaf, &key2, slot);
2814 if (key2.objectid != dirid) {
2819 temp_inode = btrfs_iget(sb, key2.objectid, root);
2820 if (IS_ERR(temp_inode)) {
2821 ret = PTR_ERR(temp_inode);
2824 ret = inode_permission(mnt_userns, temp_inode,
2825 MAY_READ | MAY_EXEC);
2832 if (key.offset == upper_limit.objectid)
2834 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2839 btrfs_release_path(path);
2840 key.objectid = key.offset;
2841 key.offset = (u64)-1;
2842 dirid = key.objectid;
2845 memmove(args->path, ptr, total_len);
2846 args->path[total_len] = '\0';
2847 btrfs_put_root(root);
2849 btrfs_release_path(path);
2852 /* Get the bottom subvolume's name from ROOT_REF */
2853 key.objectid = treeid;
2854 key.type = BTRFS_ROOT_REF_KEY;
2855 key.offset = args->treeid;
2856 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2859 } else if (ret > 0) {
2864 leaf = path->nodes[0];
2865 slot = path->slots[0];
2866 btrfs_item_key_to_cpu(leaf, &key, slot);
2868 item_off = btrfs_item_ptr_offset(leaf, slot);
2869 item_len = btrfs_item_size(leaf, slot);
2870 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2871 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2872 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2877 /* Copy subvolume's name */
2878 item_off += sizeof(struct btrfs_root_ref);
2879 item_len -= sizeof(struct btrfs_root_ref);
2880 read_extent_buffer(leaf, args->name, item_off, item_len);
2881 args->name[item_len] = 0;
2884 btrfs_put_root(root);
2886 btrfs_free_path(path);
2890 static noinline int btrfs_ioctl_ino_lookup(struct btrfs_root *root,
2893 struct btrfs_ioctl_ino_lookup_args *args;
2896 args = memdup_user(argp, sizeof(*args));
2898 return PTR_ERR(args);
2901 * Unprivileged query to obtain the containing subvolume root id. The
2902 * path is reset so it's consistent with btrfs_search_path_in_tree.
2904 if (args->treeid == 0)
2905 args->treeid = root->root_key.objectid;
2907 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2912 if (!capable(CAP_SYS_ADMIN)) {
2917 ret = btrfs_search_path_in_tree(root->fs_info,
2918 args->treeid, args->objectid,
2922 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2930 * Version of ino_lookup ioctl (unprivileged)
2932 * The main differences from ino_lookup ioctl are:
2934 * 1. Read + Exec permission will be checked using inode_permission() during
2935 * path construction. -EACCES will be returned in case of failure.
2936 * 2. Path construction will be stopped at the inode number which corresponds
2937 * to the fd with which this ioctl is called. If constructed path does not
2938 * exist under fd's inode, -EACCES will be returned.
2939 * 3. The name of bottom subvolume is also searched and filled.
2941 static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2943 struct btrfs_ioctl_ino_lookup_user_args *args;
2944 struct inode *inode;
2947 args = memdup_user(argp, sizeof(*args));
2949 return PTR_ERR(args);
2951 inode = file_inode(file);
2953 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2954 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2956 * The subvolume does not exist under fd with which this is
2963 ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args);
2965 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2972 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2973 static int btrfs_ioctl_get_subvol_info(struct inode *inode, void __user *argp)
2975 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2976 struct btrfs_fs_info *fs_info;
2977 struct btrfs_root *root;
2978 struct btrfs_path *path;
2979 struct btrfs_key key;
2980 struct btrfs_root_item *root_item;
2981 struct btrfs_root_ref *rref;
2982 struct extent_buffer *leaf;
2983 unsigned long item_off;
2984 unsigned long item_len;
2988 path = btrfs_alloc_path();
2992 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2994 btrfs_free_path(path);
2998 fs_info = BTRFS_I(inode)->root->fs_info;
3000 /* Get root_item of inode's subvolume */
3001 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
3002 root = btrfs_get_fs_root(fs_info, key.objectid, true);
3004 ret = PTR_ERR(root);
3007 root_item = &root->root_item;
3009 subvol_info->treeid = key.objectid;
3011 subvol_info->generation = btrfs_root_generation(root_item);
3012 subvol_info->flags = btrfs_root_flags(root_item);
3014 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
3015 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
3017 memcpy(subvol_info->received_uuid, root_item->received_uuid,
3020 subvol_info->ctransid = btrfs_root_ctransid(root_item);
3021 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
3022 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
3024 subvol_info->otransid = btrfs_root_otransid(root_item);
3025 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
3026 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
3028 subvol_info->stransid = btrfs_root_stransid(root_item);
3029 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
3030 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
3032 subvol_info->rtransid = btrfs_root_rtransid(root_item);
3033 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
3034 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
3036 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
3037 /* Search root tree for ROOT_BACKREF of this subvolume */
3038 key.type = BTRFS_ROOT_BACKREF_KEY;
3040 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
3043 } else if (path->slots[0] >=
3044 btrfs_header_nritems(path->nodes[0])) {
3045 ret = btrfs_next_leaf(fs_info->tree_root, path);
3048 } else if (ret > 0) {
3054 leaf = path->nodes[0];
3055 slot = path->slots[0];
3056 btrfs_item_key_to_cpu(leaf, &key, slot);
3057 if (key.objectid == subvol_info->treeid &&
3058 key.type == BTRFS_ROOT_BACKREF_KEY) {
3059 subvol_info->parent_id = key.offset;
3061 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
3062 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
3064 item_off = btrfs_item_ptr_offset(leaf, slot)
3065 + sizeof(struct btrfs_root_ref);
3066 item_len = btrfs_item_size(leaf, slot)
3067 - sizeof(struct btrfs_root_ref);
3068 read_extent_buffer(leaf, subvol_info->name,
3069 item_off, item_len);
3076 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
3080 btrfs_put_root(root);
3082 btrfs_free_path(path);
3088 * Return ROOT_REF information of the subvolume containing this inode
3089 * except the subvolume name.
3091 static int btrfs_ioctl_get_subvol_rootref(struct btrfs_root *root,
3094 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
3095 struct btrfs_root_ref *rref;
3096 struct btrfs_path *path;
3097 struct btrfs_key key;
3098 struct extent_buffer *leaf;
3104 path = btrfs_alloc_path();
3108 rootrefs = memdup_user(argp, sizeof(*rootrefs));
3109 if (IS_ERR(rootrefs)) {
3110 btrfs_free_path(path);
3111 return PTR_ERR(rootrefs);
3114 objectid = root->root_key.objectid;
3115 key.objectid = objectid;
3116 key.type = BTRFS_ROOT_REF_KEY;
3117 key.offset = rootrefs->min_treeid;
3120 root = root->fs_info->tree_root;
3121 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3124 } else if (path->slots[0] >=
3125 btrfs_header_nritems(path->nodes[0])) {
3126 ret = btrfs_next_leaf(root, path);
3129 } else if (ret > 0) {
3135 leaf = path->nodes[0];
3136 slot = path->slots[0];
3138 btrfs_item_key_to_cpu(leaf, &key, slot);
3139 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
3144 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
3149 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
3150 rootrefs->rootref[found].treeid = key.offset;
3151 rootrefs->rootref[found].dirid =
3152 btrfs_root_ref_dirid(leaf, rref);
3155 ret = btrfs_next_item(root, path);
3158 } else if (ret > 0) {
3165 if (!ret || ret == -EOVERFLOW) {
3166 rootrefs->num_items = found;
3167 /* update min_treeid for next search */
3169 rootrefs->min_treeid =
3170 rootrefs->rootref[found - 1].treeid + 1;
3171 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
3176 btrfs_free_path(path);
3181 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
3185 struct dentry *parent = file->f_path.dentry;
3186 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
3187 struct dentry *dentry;
3188 struct inode *dir = d_inode(parent);
3189 struct inode *inode;
3190 struct btrfs_root *root = BTRFS_I(dir)->root;
3191 struct btrfs_root *dest = NULL;
3192 struct btrfs_ioctl_vol_args *vol_args = NULL;
3193 struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
3194 struct user_namespace *mnt_userns = file_mnt_user_ns(file);
3195 char *subvol_name, *subvol_name_ptr = NULL;
3198 bool destroy_parent = false;
3200 /* We don't support snapshots with extent tree v2 yet. */
3201 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3203 "extent tree v2 doesn't support snapshot deletion yet");
3208 vol_args2 = memdup_user(arg, sizeof(*vol_args2));
3209 if (IS_ERR(vol_args2))
3210 return PTR_ERR(vol_args2);
3212 if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
3218 * If SPEC_BY_ID is not set, we are looking for the subvolume by
3219 * name, same as v1 currently does.
3221 if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
3222 vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0;
3223 subvol_name = vol_args2->name;
3225 err = mnt_want_write_file(file);
3229 struct inode *old_dir;
3231 if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
3236 err = mnt_want_write_file(file);
3240 dentry = btrfs_get_dentry(fs_info->sb,
3241 BTRFS_FIRST_FREE_OBJECTID,
3242 vol_args2->subvolid, 0, 0);
3243 if (IS_ERR(dentry)) {
3244 err = PTR_ERR(dentry);
3245 goto out_drop_write;
3249 * Change the default parent since the subvolume being
3250 * deleted can be outside of the current mount point.
3252 parent = btrfs_get_parent(dentry);
3255 * At this point dentry->d_name can point to '/' if the
3256 * subvolume we want to destroy is outsite of the
3257 * current mount point, so we need to release the
3258 * current dentry and execute the lookup to return a new
3259 * one with ->d_name pointing to the
3260 * <mount point>/subvol_name.
3263 if (IS_ERR(parent)) {
3264 err = PTR_ERR(parent);
3265 goto out_drop_write;
3268 dir = d_inode(parent);
3271 * If v2 was used with SPEC_BY_ID, a new parent was
3272 * allocated since the subvolume can be outside of the
3273 * current mount point. Later on we need to release this
3274 * new parent dentry.
3276 destroy_parent = true;
3279 * On idmapped mounts, deletion via subvolid is
3280 * restricted to subvolumes that are immediate
3281 * ancestors of the inode referenced by the file
3282 * descriptor in the ioctl. Otherwise the idmapping
3283 * could potentially be abused to delete subvolumes
3284 * anywhere in the filesystem the user wouldn't be able
3285 * to delete without an idmapped mount.
3287 if (old_dir != dir && mnt_userns != &init_user_ns) {
3292 subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
3293 fs_info, vol_args2->subvolid);
3294 if (IS_ERR(subvol_name_ptr)) {
3295 err = PTR_ERR(subvol_name_ptr);
3298 /* subvol_name_ptr is already nul terminated */
3299 subvol_name = (char *)kbasename(subvol_name_ptr);
3302 vol_args = memdup_user(arg, sizeof(*vol_args));
3303 if (IS_ERR(vol_args))
3304 return PTR_ERR(vol_args);
3306 vol_args->name[BTRFS_PATH_NAME_MAX] = 0;
3307 subvol_name = vol_args->name;
3309 err = mnt_want_write_file(file);
3314 subvol_namelen = strlen(subvol_name);
3316 if (strchr(subvol_name, '/') ||
3317 strncmp(subvol_name, "..", subvol_namelen) == 0) {
3319 goto free_subvol_name;
3322 if (!S_ISDIR(dir->i_mode)) {
3324 goto free_subvol_name;
3327 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
3329 goto free_subvol_name;
3330 dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen);
3331 if (IS_ERR(dentry)) {
3332 err = PTR_ERR(dentry);
3333 goto out_unlock_dir;
3336 if (d_really_is_negative(dentry)) {
3341 inode = d_inode(dentry);
3342 dest = BTRFS_I(inode)->root;
3343 if (!capable(CAP_SYS_ADMIN)) {
3345 * Regular user. Only allow this with a special mount
3346 * option, when the user has write+exec access to the
3347 * subvol root, and when rmdir(2) would have been
3350 * Note that this is _not_ check that the subvol is
3351 * empty or doesn't contain data that we wouldn't
3352 * otherwise be able to delete.
3354 * Users who want to delete empty subvols should try
3358 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
3362 * Do not allow deletion if the parent dir is the same
3363 * as the dir to be deleted. That means the ioctl
3364 * must be called on the dentry referencing the root
3365 * of the subvol, not a random directory contained
3372 err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC);
3377 /* check if subvolume may be deleted by a user */
3378 err = btrfs_may_delete(mnt_userns, dir, dentry, 1);
3382 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
3387 btrfs_inode_lock(inode, 0);
3388 err = btrfs_delete_subvolume(dir, dentry);
3389 btrfs_inode_unlock(inode, 0);
3391 d_delete_notify(dir, dentry);
3396 btrfs_inode_unlock(dir, 0);
3398 kfree(subvol_name_ptr);
3403 mnt_drop_write_file(file);
3410 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
3412 struct inode *inode = file_inode(file);
3413 struct btrfs_root *root = BTRFS_I(inode)->root;
3414 struct btrfs_ioctl_defrag_range_args range = {0};
3417 ret = mnt_want_write_file(file);
3421 if (btrfs_root_readonly(root)) {
3426 switch (inode->i_mode & S_IFMT) {
3428 if (!capable(CAP_SYS_ADMIN)) {
3432 ret = btrfs_defrag_root(root);
3436 * Note that this does not check the file descriptor for write
3437 * access. This prevents defragmenting executables that are
3438 * running and allows defrag on files open in read-only mode.
3440 if (!capable(CAP_SYS_ADMIN) &&
3441 inode_permission(&init_user_ns, inode, MAY_WRITE)) {
3447 if (copy_from_user(&range, argp, sizeof(range))) {
3451 /* compression requires us to start the IO */
3452 if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
3453 range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
3454 range.extent_thresh = (u32)-1;
3457 /* the rest are all set to zero by kzalloc */
3458 range.len = (u64)-1;
3460 ret = btrfs_defrag_file(file_inode(file), &file->f_ra,
3461 &range, BTRFS_OLDEST_GENERATION, 0);
3469 mnt_drop_write_file(file);
3473 static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
3475 struct btrfs_ioctl_vol_args *vol_args;
3476 bool restore_op = false;
3479 if (!capable(CAP_SYS_ADMIN))
3482 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3483 btrfs_err(fs_info, "device add not supported on extent tree v2 yet");
3487 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD)) {
3488 if (!btrfs_exclop_start_try_lock(fs_info, BTRFS_EXCLOP_DEV_ADD))
3489 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3492 * We can do the device add because we have a paused balanced,
3493 * change the exclusive op type and remember we should bring
3494 * back the paused balance
3496 fs_info->exclusive_operation = BTRFS_EXCLOP_DEV_ADD;
3497 btrfs_exclop_start_unlock(fs_info);
3501 vol_args = memdup_user(arg, sizeof(*vol_args));
3502 if (IS_ERR(vol_args)) {
3503 ret = PTR_ERR(vol_args);
3507 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3508 ret = btrfs_init_new_device(fs_info, vol_args->name);
3511 btrfs_info(fs_info, "disk added %s", vol_args->name);
3516 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);
3518 btrfs_exclop_finish(fs_info);
3522 static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
3524 BTRFS_DEV_LOOKUP_ARGS(args);
3525 struct inode *inode = file_inode(file);
3526 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3527 struct btrfs_ioctl_vol_args_v2 *vol_args;
3528 struct block_device *bdev = NULL;
3531 bool cancel = false;
3533 if (!capable(CAP_SYS_ADMIN))
3536 vol_args = memdup_user(arg, sizeof(*vol_args));
3537 if (IS_ERR(vol_args))
3538 return PTR_ERR(vol_args);
3540 if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
3545 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
3546 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
3547 args.devid = vol_args->devid;
3548 } else if (!strcmp("cancel", vol_args->name)) {
3551 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
3556 ret = mnt_want_write_file(file);
3560 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
3565 /* Exclusive operation is now claimed */
3566 ret = btrfs_rm_device(fs_info, &args, &bdev, &mode);
3568 btrfs_exclop_finish(fs_info);
3571 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3572 btrfs_info(fs_info, "device deleted: id %llu",
3575 btrfs_info(fs_info, "device deleted: %s",
3579 mnt_drop_write_file(file);
3581 blkdev_put(bdev, mode);
3583 btrfs_put_dev_args_from_path(&args);
3588 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
3590 BTRFS_DEV_LOOKUP_ARGS(args);
3591 struct inode *inode = file_inode(file);
3592 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3593 struct btrfs_ioctl_vol_args *vol_args;
3594 struct block_device *bdev = NULL;
3597 bool cancel = false;
3599 if (!capable(CAP_SYS_ADMIN))
3602 vol_args = memdup_user(arg, sizeof(*vol_args));
3603 if (IS_ERR(vol_args))
3604 return PTR_ERR(vol_args);
3606 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3607 if (!strcmp("cancel", vol_args->name)) {
3610 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
3615 ret = mnt_want_write_file(file);
3619 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
3622 ret = btrfs_rm_device(fs_info, &args, &bdev, &mode);
3624 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
3625 btrfs_exclop_finish(fs_info);
3628 mnt_drop_write_file(file);
3630 blkdev_put(bdev, mode);
3632 btrfs_put_dev_args_from_path(&args);
3637 static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3640 struct btrfs_ioctl_fs_info_args *fi_args;
3641 struct btrfs_device *device;
3642 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
3646 fi_args = memdup_user(arg, sizeof(*fi_args));
3647 if (IS_ERR(fi_args))
3648 return PTR_ERR(fi_args);
3650 flags_in = fi_args->flags;
3651 memset(fi_args, 0, sizeof(*fi_args));
3654 fi_args->num_devices = fs_devices->num_devices;
3656 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
3657 if (device->devid > fi_args->max_id)
3658 fi_args->max_id = device->devid;
3662 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
3663 fi_args->nodesize = fs_info->nodesize;
3664 fi_args->sectorsize = fs_info->sectorsize;
3665 fi_args->clone_alignment = fs_info->sectorsize;
3667 if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
3668 fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
3669 fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
3670 fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
3673 if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
3674 fi_args->generation = fs_info->generation;
3675 fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
3678 if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
3679 memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
3680 sizeof(fi_args->metadata_uuid));
3681 fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
3684 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3691 static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3694 BTRFS_DEV_LOOKUP_ARGS(args);
3695 struct btrfs_ioctl_dev_info_args *di_args;
3696 struct btrfs_device *dev;
3699 di_args = memdup_user(arg, sizeof(*di_args));
3700 if (IS_ERR(di_args))
3701 return PTR_ERR(di_args);
3703 args.devid = di_args->devid;
3704 if (!btrfs_is_empty_uuid(di_args->uuid))
3705 args.uuid = di_args->uuid;
3708 dev = btrfs_find_device(fs_info->fs_devices, &args);
3714 di_args->devid = dev->devid;
3715 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3716 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
3717 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
3719 strncpy(di_args->path, rcu_str_deref(dev->name),
3720 sizeof(di_args->path) - 1);
3721 di_args->path[sizeof(di_args->path) - 1] = 0;
3723 di_args->path[0] = '\0';
3728 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3735 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3737 struct inode *inode = file_inode(file);
3738 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3739 struct btrfs_root *root = BTRFS_I(inode)->root;
3740 struct btrfs_root *new_root;
3741 struct btrfs_dir_item *di;
3742 struct btrfs_trans_handle *trans;
3743 struct btrfs_path *path = NULL;
3744 struct btrfs_disk_key disk_key;
3749 if (!capable(CAP_SYS_ADMIN))
3752 ret = mnt_want_write_file(file);
3756 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3762 objectid = BTRFS_FS_TREE_OBJECTID;
3764 new_root = btrfs_get_fs_root(fs_info, objectid, true);
3765 if (IS_ERR(new_root)) {
3766 ret = PTR_ERR(new_root);
3769 if (!is_fstree(new_root->root_key.objectid)) {
3774 path = btrfs_alloc_path();
3780 trans = btrfs_start_transaction(root, 1);
3781 if (IS_ERR(trans)) {
3782 ret = PTR_ERR(trans);
3786 dir_id = btrfs_super_root_dir(fs_info->super_copy);
3787 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
3788 dir_id, "default", 7, 1);
3789 if (IS_ERR_OR_NULL(di)) {
3790 btrfs_release_path(path);
3791 btrfs_end_transaction(trans);
3793 "Umm, you don't have the default diritem, this isn't going to work");
3798 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3799 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3800 btrfs_mark_buffer_dirty(path->nodes[0]);
3801 btrfs_release_path(path);
3803 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
3804 btrfs_end_transaction(trans);
3806 btrfs_put_root(new_root);
3807 btrfs_free_path(path);
3809 mnt_drop_write_file(file);
3813 static void get_block_group_info(struct list_head *groups_list,
3814 struct btrfs_ioctl_space_info *space)
3816 struct btrfs_block_group *block_group;
3818 space->total_bytes = 0;
3819 space->used_bytes = 0;
3821 list_for_each_entry(block_group, groups_list, list) {
3822 space->flags = block_group->flags;
3823 space->total_bytes += block_group->length;
3824 space->used_bytes += block_group->used;
3828 static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
3831 struct btrfs_ioctl_space_args space_args;
3832 struct btrfs_ioctl_space_info space;
3833 struct btrfs_ioctl_space_info *dest;
3834 struct btrfs_ioctl_space_info *dest_orig;
3835 struct btrfs_ioctl_space_info __user *user_dest;
3836 struct btrfs_space_info *info;
3837 static const u64 types[] = {
3838 BTRFS_BLOCK_GROUP_DATA,
3839 BTRFS_BLOCK_GROUP_SYSTEM,
3840 BTRFS_BLOCK_GROUP_METADATA,
3841 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
3849 if (copy_from_user(&space_args,
3850 (struct btrfs_ioctl_space_args __user *)arg,
3851 sizeof(space_args)))
3854 for (i = 0; i < num_types; i++) {
3855 struct btrfs_space_info *tmp;
3858 list_for_each_entry(tmp, &fs_info->space_info, list) {
3859 if (tmp->flags == types[i]) {
3868 down_read(&info->groups_sem);
3869 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3870 if (!list_empty(&info->block_groups[c]))
3873 up_read(&info->groups_sem);
3877 * Global block reserve, exported as a space_info
3881 /* space_slots == 0 means they are asking for a count */
3882 if (space_args.space_slots == 0) {
3883 space_args.total_spaces = slot_count;
3887 slot_count = min_t(u64, space_args.space_slots, slot_count);
3889 alloc_size = sizeof(*dest) * slot_count;
3891 /* we generally have at most 6 or so space infos, one for each raid
3892 * level. So, a whole page should be more than enough for everyone
3894 if (alloc_size > PAGE_SIZE)
3897 space_args.total_spaces = 0;
3898 dest = kmalloc(alloc_size, GFP_KERNEL);
3903 /* now we have a buffer to copy into */
3904 for (i = 0; i < num_types; i++) {
3905 struct btrfs_space_info *tmp;
3911 list_for_each_entry(tmp, &fs_info->space_info, list) {
3912 if (tmp->flags == types[i]) {
3920 down_read(&info->groups_sem);
3921 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3922 if (!list_empty(&info->block_groups[c])) {
3923 get_block_group_info(&info->block_groups[c],
3925 memcpy(dest, &space, sizeof(space));
3927 space_args.total_spaces++;
3933 up_read(&info->groups_sem);
3937 * Add global block reserve
3940 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
3942 spin_lock(&block_rsv->lock);
3943 space.total_bytes = block_rsv->size;
3944 space.used_bytes = block_rsv->size - block_rsv->reserved;
3945 spin_unlock(&block_rsv->lock);
3946 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3947 memcpy(dest, &space, sizeof(space));
3948 space_args.total_spaces++;
3951 user_dest = (struct btrfs_ioctl_space_info __user *)
3952 (arg + sizeof(struct btrfs_ioctl_space_args));
3954 if (copy_to_user(user_dest, dest_orig, alloc_size))
3959 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3965 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3968 struct btrfs_trans_handle *trans;
3971 trans = btrfs_attach_transaction_barrier(root);
3972 if (IS_ERR(trans)) {
3973 if (PTR_ERR(trans) != -ENOENT)
3974 return PTR_ERR(trans);
3976 /* No running transaction, don't bother */
3977 transid = root->fs_info->last_trans_committed;
3980 transid = trans->transid;
3981 btrfs_commit_transaction_async(trans);
3984 if (copy_to_user(argp, &transid, sizeof(transid)))
3989 static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
3995 if (copy_from_user(&transid, argp, sizeof(transid)))
3998 transid = 0; /* current trans */
4000 return btrfs_wait_for_commit(fs_info, transid);
4003 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4005 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
4006 struct btrfs_ioctl_scrub_args *sa;
4009 if (!capable(CAP_SYS_ADMIN))
4012 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
4013 btrfs_err(fs_info, "scrub is not supported on extent tree v2 yet");
4017 sa = memdup_user(arg, sizeof(*sa));
4021 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4022 ret = mnt_want_write_file(file);
4027 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
4028 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4032 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
4033 * error. This is important as it allows user space to know how much
4034 * progress scrub has done. For example, if scrub is canceled we get
4035 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
4036 * space. Later user space can inspect the progress from the structure
4037 * btrfs_ioctl_scrub_args and resume scrub from where it left off
4038 * previously (btrfs-progs does this).
4039 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
4040 * then return -EFAULT to signal the structure was not copied or it may
4041 * be corrupt and unreliable due to a partial copy.
4043 if (copy_to_user(arg, sa, sizeof(*sa)))
4046 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4047 mnt_drop_write_file(file);
4053 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
4055 if (!capable(CAP_SYS_ADMIN))
4058 return btrfs_scrub_cancel(fs_info);
4061 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
4064 struct btrfs_ioctl_scrub_args *sa;
4067 if (!capable(CAP_SYS_ADMIN))
4070 sa = memdup_user(arg, sizeof(*sa));
4074 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
4076 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
4083 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
4086 struct btrfs_ioctl_get_dev_stats *sa;
4089 sa = memdup_user(arg, sizeof(*sa));
4093 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4098 ret = btrfs_get_dev_stats(fs_info, sa);
4100 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
4107 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
4110 struct btrfs_ioctl_dev_replace_args *p;
4113 if (!capable(CAP_SYS_ADMIN))
4116 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
4117 btrfs_err(fs_info, "device replace not supported on extent tree v2 yet");
4121 p = memdup_user(arg, sizeof(*p));
4126 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4127 if (sb_rdonly(fs_info->sb)) {
4131 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
4132 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4134 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
4135 btrfs_exclop_finish(fs_info);
4138 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4139 btrfs_dev_replace_status(fs_info, p);
4142 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4143 p->result = btrfs_dev_replace_cancel(fs_info);
4151 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
4158 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4164 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4165 struct inode_fs_paths *ipath = NULL;
4166 struct btrfs_path *path;
4168 if (!capable(CAP_DAC_READ_SEARCH))
4171 path = btrfs_alloc_path();
4177 ipa = memdup_user(arg, sizeof(*ipa));
4184 size = min_t(u32, ipa->size, 4096);
4185 ipath = init_ipath(size, root, path);
4186 if (IS_ERR(ipath)) {
4187 ret = PTR_ERR(ipath);
4192 ret = paths_from_inode(ipa->inum, ipath);
4196 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4197 rel_ptr = ipath->fspath->val[i] -
4198 (u64)(unsigned long)ipath->fspath->val;
4199 ipath->fspath->val[i] = rel_ptr;
4202 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
4203 ipath->fspath, size);
4210 btrfs_free_path(path);
4217 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4219 struct btrfs_data_container *inodes = ctx;
4220 const size_t c = 3 * sizeof(u64);
4222 if (inodes->bytes_left >= c) {
4223 inodes->bytes_left -= c;
4224 inodes->val[inodes->elem_cnt] = inum;
4225 inodes->val[inodes->elem_cnt + 1] = offset;
4226 inodes->val[inodes->elem_cnt + 2] = root;
4227 inodes->elem_cnt += 3;
4229 inodes->bytes_missing += c - inodes->bytes_left;
4230 inodes->bytes_left = 0;
4231 inodes->elem_missed += 3;
4237 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
4238 void __user *arg, int version)
4242 struct btrfs_ioctl_logical_ino_args *loi;
4243 struct btrfs_data_container *inodes = NULL;
4244 struct btrfs_path *path = NULL;
4247 if (!capable(CAP_SYS_ADMIN))
4250 loi = memdup_user(arg, sizeof(*loi));
4252 return PTR_ERR(loi);
4255 ignore_offset = false;
4256 size = min_t(u32, loi->size, SZ_64K);
4258 /* All reserved bits must be 0 for now */
4259 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
4263 /* Only accept flags we have defined so far */
4264 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
4268 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
4269 size = min_t(u32, loi->size, SZ_16M);
4272 path = btrfs_alloc_path();
4278 inodes = init_data_container(size);
4279 if (IS_ERR(inodes)) {
4280 ret = PTR_ERR(inodes);
4285 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
4286 build_ino_list, inodes, ignore_offset);
4292 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
4298 btrfs_free_path(path);
4306 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
4307 struct btrfs_ioctl_balance_args *bargs)
4309 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4311 bargs->flags = bctl->flags;
4313 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
4314 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4315 if (atomic_read(&fs_info->balance_pause_req))
4316 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4317 if (atomic_read(&fs_info->balance_cancel_req))
4318 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4320 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4321 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4322 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4324 spin_lock(&fs_info->balance_lock);
4325 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4326 spin_unlock(&fs_info->balance_lock);
4329 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4331 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4332 struct btrfs_fs_info *fs_info = root->fs_info;
4333 struct btrfs_ioctl_balance_args *bargs;
4334 struct btrfs_balance_control *bctl;
4335 bool need_unlock; /* for mut. excl. ops lock */
4340 "IOC_BALANCE ioctl (v1) is deprecated and will be removed in kernel 5.18");
4342 if (!capable(CAP_SYS_ADMIN))
4345 ret = mnt_want_write_file(file);
4350 if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
4351 mutex_lock(&fs_info->balance_mutex);
4357 * mut. excl. ops lock is locked. Three possibilities:
4358 * (1) some other op is running
4359 * (2) balance is running
4360 * (3) balance is paused -- special case (think resume)
4362 mutex_lock(&fs_info->balance_mutex);
4363 if (fs_info->balance_ctl) {
4364 /* this is either (2) or (3) */
4365 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4366 mutex_unlock(&fs_info->balance_mutex);
4368 * Lock released to allow other waiters to continue,
4369 * we'll reexamine the status again.
4371 mutex_lock(&fs_info->balance_mutex);
4373 if (fs_info->balance_ctl &&
4374 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4376 need_unlock = false;
4380 mutex_unlock(&fs_info->balance_mutex);
4384 mutex_unlock(&fs_info->balance_mutex);
4390 mutex_unlock(&fs_info->balance_mutex);
4391 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4398 bargs = memdup_user(arg, sizeof(*bargs));
4399 if (IS_ERR(bargs)) {
4400 ret = PTR_ERR(bargs);
4404 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4405 if (!fs_info->balance_ctl) {
4410 bctl = fs_info->balance_ctl;
4411 spin_lock(&fs_info->balance_lock);
4412 bctl->flags |= BTRFS_BALANCE_RESUME;
4413 spin_unlock(&fs_info->balance_lock);
4414 btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE);
4422 if (fs_info->balance_ctl) {
4427 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4434 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4435 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4436 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4438 bctl->flags = bargs->flags;
4440 /* balance everything - no filters */
4441 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4444 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4451 * Ownership of bctl and exclusive operation goes to btrfs_balance.
4452 * bctl is freed in reset_balance_state, or, if restriper was paused
4453 * all the way until unmount, in free_fs_info. The flag should be
4454 * cleared after reset_balance_state.
4456 need_unlock = false;
4458 ret = btrfs_balance(fs_info, bctl, bargs);
4461 if ((ret == 0 || ret == -ECANCELED) && arg) {
4462 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4471 mutex_unlock(&fs_info->balance_mutex);
4473 btrfs_exclop_finish(fs_info);
4475 mnt_drop_write_file(file);
4479 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
4481 if (!capable(CAP_SYS_ADMIN))
4485 case BTRFS_BALANCE_CTL_PAUSE:
4486 return btrfs_pause_balance(fs_info);
4487 case BTRFS_BALANCE_CTL_CANCEL:
4488 return btrfs_cancel_balance(fs_info);
4494 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
4497 struct btrfs_ioctl_balance_args *bargs;
4500 if (!capable(CAP_SYS_ADMIN))
4503 mutex_lock(&fs_info->balance_mutex);
4504 if (!fs_info->balance_ctl) {
4509 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4515 btrfs_update_ioctl_balance_args(fs_info, bargs);
4517 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4522 mutex_unlock(&fs_info->balance_mutex);
4526 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4528 struct inode *inode = file_inode(file);
4529 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4530 struct btrfs_ioctl_quota_ctl_args *sa;
4533 if (!capable(CAP_SYS_ADMIN))
4536 ret = mnt_want_write_file(file);
4540 sa = memdup_user(arg, sizeof(*sa));
4546 down_write(&fs_info->subvol_sem);
4549 case BTRFS_QUOTA_CTL_ENABLE:
4550 ret = btrfs_quota_enable(fs_info);
4552 case BTRFS_QUOTA_CTL_DISABLE:
4553 ret = btrfs_quota_disable(fs_info);
4561 up_write(&fs_info->subvol_sem);
4563 mnt_drop_write_file(file);
4567 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4569 struct inode *inode = file_inode(file);
4570 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4571 struct btrfs_root *root = BTRFS_I(inode)->root;
4572 struct btrfs_ioctl_qgroup_assign_args *sa;
4573 struct btrfs_trans_handle *trans;
4577 if (!capable(CAP_SYS_ADMIN))
4580 ret = mnt_want_write_file(file);
4584 sa = memdup_user(arg, sizeof(*sa));
4590 trans = btrfs_join_transaction(root);
4591 if (IS_ERR(trans)) {
4592 ret = PTR_ERR(trans);
4597 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
4599 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
4602 /* update qgroup status and info */
4603 err = btrfs_run_qgroups(trans);
4605 btrfs_handle_fs_error(fs_info, err,
4606 "failed to update qgroup status and info");
4607 err = btrfs_end_transaction(trans);
4614 mnt_drop_write_file(file);
4618 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4620 struct inode *inode = file_inode(file);
4621 struct btrfs_root *root = BTRFS_I(inode)->root;
4622 struct btrfs_ioctl_qgroup_create_args *sa;
4623 struct btrfs_trans_handle *trans;
4627 if (!capable(CAP_SYS_ADMIN))
4630 ret = mnt_want_write_file(file);
4634 sa = memdup_user(arg, sizeof(*sa));
4640 if (!sa->qgroupid) {
4645 trans = btrfs_join_transaction(root);
4646 if (IS_ERR(trans)) {
4647 ret = PTR_ERR(trans);
4652 ret = btrfs_create_qgroup(trans, sa->qgroupid);
4654 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
4657 err = btrfs_end_transaction(trans);
4664 mnt_drop_write_file(file);
4668 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4670 struct inode *inode = file_inode(file);
4671 struct btrfs_root *root = BTRFS_I(inode)->root;
4672 struct btrfs_ioctl_qgroup_limit_args *sa;
4673 struct btrfs_trans_handle *trans;
4678 if (!capable(CAP_SYS_ADMIN))
4681 ret = mnt_want_write_file(file);
4685 sa = memdup_user(arg, sizeof(*sa));
4691 trans = btrfs_join_transaction(root);
4692 if (IS_ERR(trans)) {
4693 ret = PTR_ERR(trans);
4697 qgroupid = sa->qgroupid;
4699 /* take the current subvol as qgroup */
4700 qgroupid = root->root_key.objectid;
4703 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
4705 err = btrfs_end_transaction(trans);
4712 mnt_drop_write_file(file);
4716 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4718 struct inode *inode = file_inode(file);
4719 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4720 struct btrfs_ioctl_quota_rescan_args *qsa;
4723 if (!capable(CAP_SYS_ADMIN))
4726 ret = mnt_want_write_file(file);
4730 qsa = memdup_user(arg, sizeof(*qsa));
4741 ret = btrfs_qgroup_rescan(fs_info);
4746 mnt_drop_write_file(file);
4750 static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
4753 struct btrfs_ioctl_quota_rescan_args qsa = {0};
4755 if (!capable(CAP_SYS_ADMIN))
4758 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4760 qsa.progress = fs_info->qgroup_rescan_progress.objectid;
4763 if (copy_to_user(arg, &qsa, sizeof(qsa)))
4769 static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
4772 if (!capable(CAP_SYS_ADMIN))
4775 return btrfs_qgroup_wait_for_completion(fs_info, true);
4778 static long _btrfs_ioctl_set_received_subvol(struct file *file,
4779 struct user_namespace *mnt_userns,
4780 struct btrfs_ioctl_received_subvol_args *sa)
4782 struct inode *inode = file_inode(file);
4783 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4784 struct btrfs_root *root = BTRFS_I(inode)->root;
4785 struct btrfs_root_item *root_item = &root->root_item;
4786 struct btrfs_trans_handle *trans;
4787 struct timespec64 ct = current_time(inode);
4789 int received_uuid_changed;
4791 if (!inode_owner_or_capable(mnt_userns, inode))
4794 ret = mnt_want_write_file(file);
4798 down_write(&fs_info->subvol_sem);
4800 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
4805 if (btrfs_root_readonly(root)) {
4812 * 2 - uuid items (received uuid + subvol uuid)
4814 trans = btrfs_start_transaction(root, 3);
4815 if (IS_ERR(trans)) {
4816 ret = PTR_ERR(trans);
4821 sa->rtransid = trans->transid;
4822 sa->rtime.sec = ct.tv_sec;
4823 sa->rtime.nsec = ct.tv_nsec;
4825 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4827 if (received_uuid_changed &&
4828 !btrfs_is_empty_uuid(root_item->received_uuid)) {
4829 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
4830 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4831 root->root_key.objectid);
4832 if (ret && ret != -ENOENT) {
4833 btrfs_abort_transaction(trans, ret);
4834 btrfs_end_transaction(trans);
4838 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4839 btrfs_set_root_stransid(root_item, sa->stransid);
4840 btrfs_set_root_rtransid(root_item, sa->rtransid);
4841 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4842 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4843 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4844 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4846 ret = btrfs_update_root(trans, fs_info->tree_root,
4847 &root->root_key, &root->root_item);
4849 btrfs_end_transaction(trans);
4852 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4853 ret = btrfs_uuid_tree_add(trans, sa->uuid,
4854 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4855 root->root_key.objectid);
4856 if (ret < 0 && ret != -EEXIST) {
4857 btrfs_abort_transaction(trans, ret);
4858 btrfs_end_transaction(trans);
4862 ret = btrfs_commit_transaction(trans);
4864 up_write(&fs_info->subvol_sem);
4865 mnt_drop_write_file(file);
4870 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4873 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4874 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4877 args32 = memdup_user(arg, sizeof(*args32));
4879 return PTR_ERR(args32);
4881 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
4887 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4888 args64->stransid = args32->stransid;
4889 args64->rtransid = args32->rtransid;
4890 args64->stime.sec = args32->stime.sec;
4891 args64->stime.nsec = args32->stime.nsec;
4892 args64->rtime.sec = args32->rtime.sec;
4893 args64->rtime.nsec = args32->rtime.nsec;
4894 args64->flags = args32->flags;
4896 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64);
4900 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4901 args32->stransid = args64->stransid;
4902 args32->rtransid = args64->rtransid;
4903 args32->stime.sec = args64->stime.sec;
4904 args32->stime.nsec = args64->stime.nsec;
4905 args32->rtime.sec = args64->rtime.sec;
4906 args32->rtime.nsec = args64->rtime.nsec;
4907 args32->flags = args64->flags;
4909 ret = copy_to_user(arg, args32, sizeof(*args32));
4920 static long btrfs_ioctl_set_received_subvol(struct file *file,
4923 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4926 sa = memdup_user(arg, sizeof(*sa));
4930 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa);
4935 ret = copy_to_user(arg, sa, sizeof(*sa));
4944 static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
4949 char label[BTRFS_LABEL_SIZE];
4951 spin_lock(&fs_info->super_lock);
4952 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4953 spin_unlock(&fs_info->super_lock);
4955 len = strnlen(label, BTRFS_LABEL_SIZE);
4957 if (len == BTRFS_LABEL_SIZE) {
4959 "label is too long, return the first %zu bytes",
4963 ret = copy_to_user(arg, label, len);
4965 return ret ? -EFAULT : 0;
4968 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4970 struct inode *inode = file_inode(file);
4971 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4972 struct btrfs_root *root = BTRFS_I(inode)->root;
4973 struct btrfs_super_block *super_block = fs_info->super_copy;
4974 struct btrfs_trans_handle *trans;
4975 char label[BTRFS_LABEL_SIZE];
4978 if (!capable(CAP_SYS_ADMIN))
4981 if (copy_from_user(label, arg, sizeof(label)))
4984 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4986 "unable to set label with more than %d bytes",
4987 BTRFS_LABEL_SIZE - 1);
4991 ret = mnt_want_write_file(file);
4995 trans = btrfs_start_transaction(root, 0);
4996 if (IS_ERR(trans)) {
4997 ret = PTR_ERR(trans);
5001 spin_lock(&fs_info->super_lock);
5002 strcpy(super_block->label, label);
5003 spin_unlock(&fs_info->super_lock);
5004 ret = btrfs_commit_transaction(trans);
5007 mnt_drop_write_file(file);
5011 #define INIT_FEATURE_FLAGS(suffix) \
5012 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5013 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5014 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5016 int btrfs_ioctl_get_supported_features(void __user *arg)
5018 static const struct btrfs_ioctl_feature_flags features[3] = {
5019 INIT_FEATURE_FLAGS(SUPP),
5020 INIT_FEATURE_FLAGS(SAFE_SET),
5021 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5024 if (copy_to_user(arg, &features, sizeof(features)))
5030 static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
5033 struct btrfs_super_block *super_block = fs_info->super_copy;
5034 struct btrfs_ioctl_feature_flags features;
5036 features.compat_flags = btrfs_super_compat_flags(super_block);
5037 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5038 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5040 if (copy_to_user(arg, &features, sizeof(features)))
5046 static int check_feature_bits(struct btrfs_fs_info *fs_info,
5047 enum btrfs_feature_set set,
5048 u64 change_mask, u64 flags, u64 supported_flags,
5049 u64 safe_set, u64 safe_clear)
5051 const char *type = btrfs_feature_set_name(set);
5053 u64 disallowed, unsupported;
5054 u64 set_mask = flags & change_mask;
5055 u64 clear_mask = ~flags & change_mask;
5057 unsupported = set_mask & ~supported_flags;
5059 names = btrfs_printable_features(set, unsupported);
5062 "this kernel does not support the %s feature bit%s",
5063 names, strchr(names, ',') ? "s" : "");
5067 "this kernel does not support %s bits 0x%llx",
5072 disallowed = set_mask & ~safe_set;
5074 names = btrfs_printable_features(set, disallowed);
5077 "can't set the %s feature bit%s while mounted",
5078 names, strchr(names, ',') ? "s" : "");
5082 "can't set %s bits 0x%llx while mounted",
5087 disallowed = clear_mask & ~safe_clear;
5089 names = btrfs_printable_features(set, disallowed);
5092 "can't clear the %s feature bit%s while mounted",
5093 names, strchr(names, ',') ? "s" : "");
5097 "can't clear %s bits 0x%llx while mounted",
5105 #define check_feature(fs_info, change_mask, flags, mask_base) \
5106 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
5107 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5108 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5109 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5111 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5113 struct inode *inode = file_inode(file);
5114 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5115 struct btrfs_root *root = BTRFS_I(inode)->root;
5116 struct btrfs_super_block *super_block = fs_info->super_copy;
5117 struct btrfs_ioctl_feature_flags flags[2];
5118 struct btrfs_trans_handle *trans;
5122 if (!capable(CAP_SYS_ADMIN))
5125 if (copy_from_user(flags, arg, sizeof(flags)))
5129 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5130 !flags[0].incompat_flags)
5133 ret = check_feature(fs_info, flags[0].compat_flags,
5134 flags[1].compat_flags, COMPAT);
5138 ret = check_feature(fs_info, flags[0].compat_ro_flags,
5139 flags[1].compat_ro_flags, COMPAT_RO);
5143 ret = check_feature(fs_info, flags[0].incompat_flags,
5144 flags[1].incompat_flags, INCOMPAT);
5148 ret = mnt_want_write_file(file);
5152 trans = btrfs_start_transaction(root, 0);
5153 if (IS_ERR(trans)) {
5154 ret = PTR_ERR(trans);
5155 goto out_drop_write;
5158 spin_lock(&fs_info->super_lock);
5159 newflags = btrfs_super_compat_flags(super_block);
5160 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5161 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5162 btrfs_set_super_compat_flags(super_block, newflags);
5164 newflags = btrfs_super_compat_ro_flags(super_block);
5165 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5166 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5167 btrfs_set_super_compat_ro_flags(super_block, newflags);
5169 newflags = btrfs_super_incompat_flags(super_block);
5170 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5171 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5172 btrfs_set_super_incompat_flags(super_block, newflags);
5173 spin_unlock(&fs_info->super_lock);
5175 ret = btrfs_commit_transaction(trans);
5177 mnt_drop_write_file(file);
5182 static int _btrfs_ioctl_send(struct inode *inode, void __user *argp, bool compat)
5184 struct btrfs_ioctl_send_args *arg;
5188 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5189 struct btrfs_ioctl_send_args_32 args32;
5191 ret = copy_from_user(&args32, argp, sizeof(args32));
5194 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
5197 arg->send_fd = args32.send_fd;
5198 arg->clone_sources_count = args32.clone_sources_count;
5199 arg->clone_sources = compat_ptr(args32.clone_sources);
5200 arg->parent_root = args32.parent_root;
5201 arg->flags = args32.flags;
5202 memcpy(arg->reserved, args32.reserved,
5203 sizeof(args32.reserved));
5208 arg = memdup_user(argp, sizeof(*arg));
5210 return PTR_ERR(arg);
5212 ret = btrfs_ioctl_send(inode, arg);
5217 static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp,
5220 struct btrfs_ioctl_encoded_io_args args = { 0 };
5221 size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args,
5224 struct iovec iovstack[UIO_FASTIOV];
5225 struct iovec *iov = iovstack;
5226 struct iov_iter iter;
5231 if (!capable(CAP_SYS_ADMIN)) {
5237 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5238 struct btrfs_ioctl_encoded_io_args_32 args32;
5240 copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32,
5242 if (copy_from_user(&args32, argp, copy_end)) {
5246 args.iov = compat_ptr(args32.iov);
5247 args.iovcnt = args32.iovcnt;
5248 args.offset = args32.offset;
5249 args.flags = args32.flags;
5254 copy_end = copy_end_kernel;
5255 if (copy_from_user(&args, argp, copy_end)) {
5260 if (args.flags != 0) {
5265 ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
5270 if (iov_iter_count(&iter) == 0) {
5275 ret = rw_verify_area(READ, file, &pos, args.len);
5279 init_sync_kiocb(&kiocb, file);
5282 ret = btrfs_encoded_read(&kiocb, &iter, &args);
5284 fsnotify_access(file);
5285 if (copy_to_user(argp + copy_end,
5286 (char *)&args + copy_end_kernel,
5287 sizeof(args) - copy_end_kernel))
5295 add_rchar(current, ret);
5300 static int btrfs_ioctl_encoded_write(struct file *file, void __user *argp, bool compat)
5302 struct btrfs_ioctl_encoded_io_args args;
5303 struct iovec iovstack[UIO_FASTIOV];
5304 struct iovec *iov = iovstack;
5305 struct iov_iter iter;
5310 if (!capable(CAP_SYS_ADMIN)) {
5315 if (!(file->f_mode & FMODE_WRITE)) {
5321 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5322 struct btrfs_ioctl_encoded_io_args_32 args32;
5324 if (copy_from_user(&args32, argp, sizeof(args32))) {
5328 args.iov = compat_ptr(args32.iov);
5329 args.iovcnt = args32.iovcnt;
5330 args.offset = args32.offset;
5331 args.flags = args32.flags;
5332 args.len = args32.len;
5333 args.unencoded_len = args32.unencoded_len;
5334 args.unencoded_offset = args32.unencoded_offset;
5335 args.compression = args32.compression;
5336 args.encryption = args32.encryption;
5337 memcpy(args.reserved, args32.reserved, sizeof(args.reserved));
5342 if (copy_from_user(&args, argp, sizeof(args))) {
5349 if (args.flags != 0)
5351 if (memchr_inv(args.reserved, 0, sizeof(args.reserved)))
5353 if (args.compression == BTRFS_ENCODED_IO_COMPRESSION_NONE &&
5354 args.encryption == BTRFS_ENCODED_IO_ENCRYPTION_NONE)
5356 if (args.compression >= BTRFS_ENCODED_IO_COMPRESSION_TYPES ||
5357 args.encryption >= BTRFS_ENCODED_IO_ENCRYPTION_TYPES)
5359 if (args.unencoded_offset > args.unencoded_len)
5361 if (args.len > args.unencoded_len - args.unencoded_offset)
5364 ret = import_iovec(WRITE, args.iov, args.iovcnt, ARRAY_SIZE(iovstack),
5369 file_start_write(file);
5371 if (iov_iter_count(&iter) == 0) {
5376 ret = rw_verify_area(WRITE, file, &pos, args.len);
5380 init_sync_kiocb(&kiocb, file);
5381 ret = kiocb_set_rw_flags(&kiocb, 0);
5386 ret = btrfs_do_write_iter(&kiocb, &iter, &args);
5388 fsnotify_modify(file);
5391 file_end_write(file);
5395 add_wchar(current, ret);
5400 long btrfs_ioctl(struct file *file, unsigned int
5401 cmd, unsigned long arg)
5403 struct inode *inode = file_inode(file);
5404 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5405 struct btrfs_root *root = BTRFS_I(inode)->root;
5406 void __user *argp = (void __user *)arg;
5409 case FS_IOC_GETVERSION:
5410 return btrfs_ioctl_getversion(inode, argp);
5411 case FS_IOC_GETFSLABEL:
5412 return btrfs_ioctl_get_fslabel(fs_info, argp);
5413 case FS_IOC_SETFSLABEL:
5414 return btrfs_ioctl_set_fslabel(file, argp);
5416 return btrfs_ioctl_fitrim(fs_info, argp);
5417 case BTRFS_IOC_SNAP_CREATE:
5418 return btrfs_ioctl_snap_create(file, argp, 0);
5419 case BTRFS_IOC_SNAP_CREATE_V2:
5420 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5421 case BTRFS_IOC_SUBVOL_CREATE:
5422 return btrfs_ioctl_snap_create(file, argp, 1);
5423 case BTRFS_IOC_SUBVOL_CREATE_V2:
5424 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5425 case BTRFS_IOC_SNAP_DESTROY:
5426 return btrfs_ioctl_snap_destroy(file, argp, false);
5427 case BTRFS_IOC_SNAP_DESTROY_V2:
5428 return btrfs_ioctl_snap_destroy(file, argp, true);
5429 case BTRFS_IOC_SUBVOL_GETFLAGS:
5430 return btrfs_ioctl_subvol_getflags(inode, argp);
5431 case BTRFS_IOC_SUBVOL_SETFLAGS:
5432 return btrfs_ioctl_subvol_setflags(file, argp);
5433 case BTRFS_IOC_DEFAULT_SUBVOL:
5434 return btrfs_ioctl_default_subvol(file, argp);
5435 case BTRFS_IOC_DEFRAG:
5436 return btrfs_ioctl_defrag(file, NULL);
5437 case BTRFS_IOC_DEFRAG_RANGE:
5438 return btrfs_ioctl_defrag(file, argp);
5439 case BTRFS_IOC_RESIZE:
5440 return btrfs_ioctl_resize(file, argp);
5441 case BTRFS_IOC_ADD_DEV:
5442 return btrfs_ioctl_add_dev(fs_info, argp);
5443 case BTRFS_IOC_RM_DEV:
5444 return btrfs_ioctl_rm_dev(file, argp);
5445 case BTRFS_IOC_RM_DEV_V2:
5446 return btrfs_ioctl_rm_dev_v2(file, argp);
5447 case BTRFS_IOC_FS_INFO:
5448 return btrfs_ioctl_fs_info(fs_info, argp);
5449 case BTRFS_IOC_DEV_INFO:
5450 return btrfs_ioctl_dev_info(fs_info, argp);
5451 case BTRFS_IOC_BALANCE:
5452 return btrfs_ioctl_balance(file, NULL);
5453 case BTRFS_IOC_TREE_SEARCH:
5454 return btrfs_ioctl_tree_search(inode, argp);
5455 case BTRFS_IOC_TREE_SEARCH_V2:
5456 return btrfs_ioctl_tree_search_v2(inode, argp);
5457 case BTRFS_IOC_INO_LOOKUP:
5458 return btrfs_ioctl_ino_lookup(root, argp);
5459 case BTRFS_IOC_INO_PATHS:
5460 return btrfs_ioctl_ino_to_path(root, argp);
5461 case BTRFS_IOC_LOGICAL_INO:
5462 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5463 case BTRFS_IOC_LOGICAL_INO_V2:
5464 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
5465 case BTRFS_IOC_SPACE_INFO:
5466 return btrfs_ioctl_space_info(fs_info, argp);
5467 case BTRFS_IOC_SYNC: {
5470 ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
5473 ret = btrfs_sync_fs(inode->i_sb, 1);
5475 * The transaction thread may want to do more work,
5476 * namely it pokes the cleaner kthread that will start
5477 * processing uncleaned subvols.
5479 wake_up_process(fs_info->transaction_kthread);
5482 case BTRFS_IOC_START_SYNC:
5483 return btrfs_ioctl_start_sync(root, argp);
5484 case BTRFS_IOC_WAIT_SYNC:
5485 return btrfs_ioctl_wait_sync(fs_info, argp);
5486 case BTRFS_IOC_SCRUB:
5487 return btrfs_ioctl_scrub(file, argp);
5488 case BTRFS_IOC_SCRUB_CANCEL:
5489 return btrfs_ioctl_scrub_cancel(fs_info);
5490 case BTRFS_IOC_SCRUB_PROGRESS:
5491 return btrfs_ioctl_scrub_progress(fs_info, argp);
5492 case BTRFS_IOC_BALANCE_V2:
5493 return btrfs_ioctl_balance(file, argp);
5494 case BTRFS_IOC_BALANCE_CTL:
5495 return btrfs_ioctl_balance_ctl(fs_info, arg);
5496 case BTRFS_IOC_BALANCE_PROGRESS:
5497 return btrfs_ioctl_balance_progress(fs_info, argp);
5498 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5499 return btrfs_ioctl_set_received_subvol(file, argp);
5501 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5502 return btrfs_ioctl_set_received_subvol_32(file, argp);
5504 case BTRFS_IOC_SEND:
5505 return _btrfs_ioctl_send(inode, argp, false);
5506 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5507 case BTRFS_IOC_SEND_32:
5508 return _btrfs_ioctl_send(inode, argp, true);
5510 case BTRFS_IOC_GET_DEV_STATS:
5511 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5512 case BTRFS_IOC_QUOTA_CTL:
5513 return btrfs_ioctl_quota_ctl(file, argp);
5514 case BTRFS_IOC_QGROUP_ASSIGN:
5515 return btrfs_ioctl_qgroup_assign(file, argp);
5516 case BTRFS_IOC_QGROUP_CREATE:
5517 return btrfs_ioctl_qgroup_create(file, argp);
5518 case BTRFS_IOC_QGROUP_LIMIT:
5519 return btrfs_ioctl_qgroup_limit(file, argp);
5520 case BTRFS_IOC_QUOTA_RESCAN:
5521 return btrfs_ioctl_quota_rescan(file, argp);
5522 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5523 return btrfs_ioctl_quota_rescan_status(fs_info, argp);
5524 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5525 return btrfs_ioctl_quota_rescan_wait(fs_info, argp);
5526 case BTRFS_IOC_DEV_REPLACE:
5527 return btrfs_ioctl_dev_replace(fs_info, argp);
5528 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5529 return btrfs_ioctl_get_supported_features(argp);
5530 case BTRFS_IOC_GET_FEATURES:
5531 return btrfs_ioctl_get_features(fs_info, argp);
5532 case BTRFS_IOC_SET_FEATURES:
5533 return btrfs_ioctl_set_features(file, argp);
5534 case BTRFS_IOC_GET_SUBVOL_INFO:
5535 return btrfs_ioctl_get_subvol_info(inode, argp);
5536 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5537 return btrfs_ioctl_get_subvol_rootref(root, argp);
5538 case BTRFS_IOC_INO_LOOKUP_USER:
5539 return btrfs_ioctl_ino_lookup_user(file, argp);
5540 case FS_IOC_ENABLE_VERITY:
5541 return fsverity_ioctl_enable(file, (const void __user *)argp);
5542 case FS_IOC_MEASURE_VERITY:
5543 return fsverity_ioctl_measure(file, argp);
5544 case BTRFS_IOC_ENCODED_READ:
5545 return btrfs_ioctl_encoded_read(file, argp, false);
5546 case BTRFS_IOC_ENCODED_WRITE:
5547 return btrfs_ioctl_encoded_write(file, argp, false);
5548 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5549 case BTRFS_IOC_ENCODED_READ_32:
5550 return btrfs_ioctl_encoded_read(file, argp, true);
5551 case BTRFS_IOC_ENCODED_WRITE_32:
5552 return btrfs_ioctl_encoded_write(file, argp, true);
5559 #ifdef CONFIG_COMPAT
5560 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5563 * These all access 32-bit values anyway so no further
5564 * handling is necessary.
5567 case FS_IOC32_GETVERSION:
5568 cmd = FS_IOC_GETVERSION;
5572 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));