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>
34 #include "transaction.h"
35 #include "btrfs_inode.h"
36 #include "print-tree.h"
40 #include "rcu-string.h"
42 #include "dev-replace.h"
47 #include "compression.h"
48 #include "space-info.h"
49 #include "delalloc-space.h"
50 #include "block-group.h"
54 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
55 * structures are incorrect, as the timespec structure from userspace
56 * is 4 bytes too small. We define these alternatives here to teach
57 * the kernel about the 32-bit struct packing.
59 struct btrfs_ioctl_timespec_32 {
62 } __attribute__ ((__packed__));
64 struct btrfs_ioctl_received_subvol_args_32 {
65 char uuid[BTRFS_UUID_SIZE]; /* in */
66 __u64 stransid; /* in */
67 __u64 rtransid; /* out */
68 struct btrfs_ioctl_timespec_32 stime; /* in */
69 struct btrfs_ioctl_timespec_32 rtime; /* out */
71 __u64 reserved[16]; /* in */
72 } __attribute__ ((__packed__));
74 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
75 struct btrfs_ioctl_received_subvol_args_32)
78 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
79 struct btrfs_ioctl_send_args_32 {
80 __s64 send_fd; /* in */
81 __u64 clone_sources_count; /* in */
82 compat_uptr_t clone_sources; /* in */
83 __u64 parent_root; /* in */
85 __u32 version; /* in */
86 __u8 reserved[28]; /* in */
87 } __attribute__ ((__packed__));
89 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
90 struct btrfs_ioctl_send_args_32)
93 /* Mask out flags that are inappropriate for the given type of inode. */
94 static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
97 if (S_ISDIR(inode->i_mode))
99 else if (S_ISREG(inode->i_mode))
100 return flags & ~FS_DIRSYNC_FL;
102 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
106 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
109 static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode)
111 unsigned int iflags = 0;
112 u32 flags = binode->flags;
113 u32 ro_flags = binode->ro_flags;
115 if (flags & BTRFS_INODE_SYNC)
116 iflags |= FS_SYNC_FL;
117 if (flags & BTRFS_INODE_IMMUTABLE)
118 iflags |= FS_IMMUTABLE_FL;
119 if (flags & BTRFS_INODE_APPEND)
120 iflags |= FS_APPEND_FL;
121 if (flags & BTRFS_INODE_NODUMP)
122 iflags |= FS_NODUMP_FL;
123 if (flags & BTRFS_INODE_NOATIME)
124 iflags |= FS_NOATIME_FL;
125 if (flags & BTRFS_INODE_DIRSYNC)
126 iflags |= FS_DIRSYNC_FL;
127 if (flags & BTRFS_INODE_NODATACOW)
128 iflags |= FS_NOCOW_FL;
129 if (ro_flags & BTRFS_INODE_RO_VERITY)
130 iflags |= FS_VERITY_FL;
132 if (flags & BTRFS_INODE_NOCOMPRESS)
133 iflags |= FS_NOCOMP_FL;
134 else if (flags & BTRFS_INODE_COMPRESS)
135 iflags |= FS_COMPR_FL;
141 * Update inode->i_flags based on the btrfs internal flags.
143 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
145 struct btrfs_inode *binode = BTRFS_I(inode);
146 unsigned int new_fl = 0;
148 if (binode->flags & BTRFS_INODE_SYNC)
150 if (binode->flags & BTRFS_INODE_IMMUTABLE)
151 new_fl |= S_IMMUTABLE;
152 if (binode->flags & BTRFS_INODE_APPEND)
154 if (binode->flags & BTRFS_INODE_NOATIME)
156 if (binode->flags & BTRFS_INODE_DIRSYNC)
158 if (binode->ro_flags & BTRFS_INODE_RO_VERITY)
161 set_mask_bits(&inode->i_flags,
162 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC |
167 * Check if @flags are a supported and valid set of FS_*_FL flags and that
168 * the old and new flags are not conflicting
170 static int check_fsflags(unsigned int old_flags, unsigned int flags)
172 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
173 FS_NOATIME_FL | FS_NODUMP_FL | \
174 FS_SYNC_FL | FS_DIRSYNC_FL | \
175 FS_NOCOMP_FL | FS_COMPR_FL |
179 /* COMPR and NOCOMP on new/old are valid */
180 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
183 if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
186 /* NOCOW and compression options are mutually exclusive */
187 if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
189 if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
195 static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
198 if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL))
205 * Set flags/xflags from the internal inode flags. The remaining items of
206 * fsxattr are zeroed.
208 int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
210 struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
212 fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode));
216 int btrfs_fileattr_set(struct user_namespace *mnt_userns,
217 struct dentry *dentry, struct fileattr *fa)
219 struct inode *inode = d_inode(dentry);
220 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
221 struct btrfs_inode *binode = BTRFS_I(inode);
222 struct btrfs_root *root = binode->root;
223 struct btrfs_trans_handle *trans;
224 unsigned int fsflags, old_fsflags;
226 const char *comp = NULL;
229 if (btrfs_root_readonly(root))
232 if (fileattr_has_fsx(fa))
235 fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
236 old_fsflags = btrfs_inode_flags_to_fsflags(binode);
237 ret = check_fsflags(old_fsflags, fsflags);
241 ret = check_fsflags_compatible(fs_info, fsflags);
245 binode_flags = binode->flags;
246 if (fsflags & FS_SYNC_FL)
247 binode_flags |= BTRFS_INODE_SYNC;
249 binode_flags &= ~BTRFS_INODE_SYNC;
250 if (fsflags & FS_IMMUTABLE_FL)
251 binode_flags |= BTRFS_INODE_IMMUTABLE;
253 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
254 if (fsflags & FS_APPEND_FL)
255 binode_flags |= BTRFS_INODE_APPEND;
257 binode_flags &= ~BTRFS_INODE_APPEND;
258 if (fsflags & FS_NODUMP_FL)
259 binode_flags |= BTRFS_INODE_NODUMP;
261 binode_flags &= ~BTRFS_INODE_NODUMP;
262 if (fsflags & FS_NOATIME_FL)
263 binode_flags |= BTRFS_INODE_NOATIME;
265 binode_flags &= ~BTRFS_INODE_NOATIME;
267 /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
268 if (!fa->flags_valid) {
269 /* 1 item for the inode */
270 trans = btrfs_start_transaction(root, 1);
272 return PTR_ERR(trans);
276 if (fsflags & FS_DIRSYNC_FL)
277 binode_flags |= BTRFS_INODE_DIRSYNC;
279 binode_flags &= ~BTRFS_INODE_DIRSYNC;
280 if (fsflags & FS_NOCOW_FL) {
281 if (S_ISREG(inode->i_mode)) {
283 * It's safe to turn csums off here, no extents exist.
284 * Otherwise we want the flag to reflect the real COW
285 * status of the file and will not set it.
287 if (inode->i_size == 0)
288 binode_flags |= BTRFS_INODE_NODATACOW |
289 BTRFS_INODE_NODATASUM;
291 binode_flags |= BTRFS_INODE_NODATACOW;
295 * Revert back under same assumptions as above
297 if (S_ISREG(inode->i_mode)) {
298 if (inode->i_size == 0)
299 binode_flags &= ~(BTRFS_INODE_NODATACOW |
300 BTRFS_INODE_NODATASUM);
302 binode_flags &= ~BTRFS_INODE_NODATACOW;
307 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
308 * flag may be changed automatically if compression code won't make
311 if (fsflags & FS_NOCOMP_FL) {
312 binode_flags &= ~BTRFS_INODE_COMPRESS;
313 binode_flags |= BTRFS_INODE_NOCOMPRESS;
314 } else if (fsflags & FS_COMPR_FL) {
316 if (IS_SWAPFILE(inode))
319 binode_flags |= BTRFS_INODE_COMPRESS;
320 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
322 comp = btrfs_compress_type2str(fs_info->compress_type);
323 if (!comp || comp[0] == 0)
324 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
326 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
333 trans = btrfs_start_transaction(root, 3);
335 return PTR_ERR(trans);
338 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
341 btrfs_abort_transaction(trans, ret);
345 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
347 if (ret && ret != -ENODATA) {
348 btrfs_abort_transaction(trans, ret);
354 binode->flags = binode_flags;
355 btrfs_sync_inode_flags_to_i_flags(inode);
356 inode_inc_iversion(inode);
357 inode->i_ctime = current_time(inode);
358 ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
361 btrfs_end_transaction(trans);
366 * Start exclusive operation @type, return true on success
368 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
369 enum btrfs_exclusive_operation type)
373 spin_lock(&fs_info->super_lock);
374 if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) {
375 fs_info->exclusive_operation = type;
378 spin_unlock(&fs_info->super_lock);
384 * Conditionally allow to enter the exclusive operation in case it's compatible
385 * with the running one. This must be paired with btrfs_exclop_start_unlock and
386 * btrfs_exclop_finish.
389 * - the same type is already running
390 * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller
391 * must check the condition first that would allow none -> @type
393 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
394 enum btrfs_exclusive_operation type)
396 spin_lock(&fs_info->super_lock);
397 if (fs_info->exclusive_operation == type)
400 spin_unlock(&fs_info->super_lock);
404 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info)
406 spin_unlock(&fs_info->super_lock);
409 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
411 spin_lock(&fs_info->super_lock);
412 WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
413 spin_unlock(&fs_info->super_lock);
414 sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
417 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
419 struct inode *inode = file_inode(file);
421 return put_user(inode->i_generation, arg);
424 static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
427 struct btrfs_device *device;
428 struct request_queue *q;
429 struct fstrim_range range;
430 u64 minlen = ULLONG_MAX;
434 if (!capable(CAP_SYS_ADMIN))
438 * btrfs_trim_block_group() depends on space cache, which is not
439 * available in zoned filesystem. So, disallow fitrim on a zoned
440 * filesystem for now.
442 if (btrfs_is_zoned(fs_info))
446 * If the fs is mounted with nologreplay, which requires it to be
447 * mounted in RO mode as well, we can not allow discard on free space
448 * inside block groups, because log trees refer to extents that are not
449 * pinned in a block group's free space cache (pinning the extents is
450 * precisely the first phase of replaying a log tree).
452 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
456 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
460 q = bdev_get_queue(device->bdev);
461 if (blk_queue_discard(q)) {
463 minlen = min_t(u64, q->limits.discard_granularity,
471 if (copy_from_user(&range, arg, sizeof(range)))
475 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
476 * block group is in the logical address space, which can be any
477 * sectorsize aligned bytenr in the range [0, U64_MAX].
479 if (range.len < fs_info->sb->s_blocksize)
482 range.minlen = max(range.minlen, minlen);
483 ret = btrfs_trim_fs(fs_info, &range);
487 if (copy_to_user(arg, &range, sizeof(range)))
493 int __pure btrfs_is_empty_uuid(u8 *uuid)
497 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
504 static noinline int create_subvol(struct user_namespace *mnt_userns,
505 struct inode *dir, struct dentry *dentry,
506 const char *name, int namelen,
507 struct btrfs_qgroup_inherit *inherit)
509 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
510 struct btrfs_trans_handle *trans;
511 struct btrfs_key key;
512 struct btrfs_root_item *root_item;
513 struct btrfs_inode_item *inode_item;
514 struct extent_buffer *leaf;
515 struct btrfs_root *root = BTRFS_I(dir)->root;
516 struct btrfs_root *new_root;
517 struct btrfs_block_rsv block_rsv;
518 struct timespec64 cur_time = current_time(dir);
526 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
530 ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid);
534 ret = get_anon_bdev(&anon_dev);
539 * Don't create subvolume whose level is not zero. Or qgroup will be
540 * screwed up since it assumes subvolume qgroup's level to be 0.
542 if (btrfs_qgroup_level(objectid)) {
547 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
549 * The same as the snapshot creation, please see the comment
550 * of create_snapshot().
552 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
556 trans = btrfs_start_transaction(root, 0);
558 ret = PTR_ERR(trans);
559 btrfs_subvolume_release_metadata(root, &block_rsv);
562 trans->block_rsv = &block_rsv;
563 trans->bytes_reserved = block_rsv.size;
565 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
569 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
570 BTRFS_NESTING_NORMAL);
576 btrfs_mark_buffer_dirty(leaf);
578 inode_item = &root_item->inode;
579 btrfs_set_stack_inode_generation(inode_item, 1);
580 btrfs_set_stack_inode_size(inode_item, 3);
581 btrfs_set_stack_inode_nlink(inode_item, 1);
582 btrfs_set_stack_inode_nbytes(inode_item,
584 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
586 btrfs_set_root_flags(root_item, 0);
587 btrfs_set_root_limit(root_item, 0);
588 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
590 btrfs_set_root_bytenr(root_item, leaf->start);
591 btrfs_set_root_generation(root_item, trans->transid);
592 btrfs_set_root_level(root_item, 0);
593 btrfs_set_root_refs(root_item, 1);
594 btrfs_set_root_used(root_item, leaf->len);
595 btrfs_set_root_last_snapshot(root_item, 0);
597 btrfs_set_root_generation_v2(root_item,
598 btrfs_root_generation(root_item));
599 generate_random_guid(root_item->uuid);
600 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
601 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
602 root_item->ctime = root_item->otime;
603 btrfs_set_root_ctransid(root_item, trans->transid);
604 btrfs_set_root_otransid(root_item, trans->transid);
606 btrfs_tree_unlock(leaf);
608 btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID);
610 key.objectid = objectid;
612 key.type = BTRFS_ROOT_ITEM_KEY;
613 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
617 * Since we don't abort the transaction in this case, free the
618 * tree block so that we don't leak space and leave the
619 * filesystem in an inconsistent state (an extent item in the
620 * extent tree with a backreference for a root that does not
623 btrfs_tree_lock(leaf);
624 btrfs_clean_tree_block(leaf);
625 btrfs_tree_unlock(leaf);
626 btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
627 free_extent_buffer(leaf);
631 free_extent_buffer(leaf);
634 key.offset = (u64)-1;
635 new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev);
636 if (IS_ERR(new_root)) {
637 free_anon_bdev(anon_dev);
638 ret = PTR_ERR(new_root);
639 btrfs_abort_transaction(trans, ret);
642 /* Freeing will be done in btrfs_put_root() of new_root */
645 ret = btrfs_record_root_in_trans(trans, new_root);
647 btrfs_put_root(new_root);
648 btrfs_abort_transaction(trans, ret);
652 ret = btrfs_create_subvol_root(trans, new_root, root, mnt_userns);
653 btrfs_put_root(new_root);
655 /* We potentially lose an unused inode item here */
656 btrfs_abort_transaction(trans, ret);
661 * insert the directory item
663 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
665 btrfs_abort_transaction(trans, ret);
669 ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
670 BTRFS_FT_DIR, index);
672 btrfs_abort_transaction(trans, ret);
676 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
677 ret = btrfs_update_inode(trans, root, BTRFS_I(dir));
679 btrfs_abort_transaction(trans, ret);
683 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
684 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
686 btrfs_abort_transaction(trans, ret);
690 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
691 BTRFS_UUID_KEY_SUBVOL, objectid);
693 btrfs_abort_transaction(trans, ret);
697 trans->block_rsv = NULL;
698 trans->bytes_reserved = 0;
699 btrfs_subvolume_release_metadata(root, &block_rsv);
701 err = btrfs_commit_transaction(trans);
706 inode = btrfs_lookup_dentry(dir, dentry);
708 return PTR_ERR(inode);
709 d_instantiate(dentry, inode);
715 free_anon_bdev(anon_dev);
720 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
721 struct dentry *dentry, bool readonly,
722 struct btrfs_qgroup_inherit *inherit)
724 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
726 struct btrfs_pending_snapshot *pending_snapshot;
727 struct btrfs_trans_handle *trans;
730 if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
733 if (atomic_read(&root->nr_swapfiles)) {
735 "cannot snapshot subvolume with active swapfile");
739 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
740 if (!pending_snapshot)
743 ret = get_anon_bdev(&pending_snapshot->anon_dev);
746 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
748 pending_snapshot->path = btrfs_alloc_path();
749 if (!pending_snapshot->root_item || !pending_snapshot->path) {
754 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
755 BTRFS_BLOCK_RSV_TEMP);
757 * 1 - parent dir inode
760 * 2 - root ref/backref
761 * 1 - root of snapshot
764 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
765 &pending_snapshot->block_rsv, 8,
770 pending_snapshot->dentry = dentry;
771 pending_snapshot->root = root;
772 pending_snapshot->readonly = readonly;
773 pending_snapshot->dir = dir;
774 pending_snapshot->inherit = inherit;
776 trans = btrfs_start_transaction(root, 0);
778 ret = PTR_ERR(trans);
782 spin_lock(&fs_info->trans_lock);
783 list_add(&pending_snapshot->list,
784 &trans->transaction->pending_snapshots);
785 spin_unlock(&fs_info->trans_lock);
787 ret = btrfs_commit_transaction(trans);
791 ret = pending_snapshot->error;
795 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
799 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
801 ret = PTR_ERR(inode);
805 d_instantiate(dentry, inode);
807 pending_snapshot->anon_dev = 0;
809 /* Prevent double freeing of anon_dev */
810 if (ret && pending_snapshot->snap)
811 pending_snapshot->snap->anon_dev = 0;
812 btrfs_put_root(pending_snapshot->snap);
813 btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv);
815 if (pending_snapshot->anon_dev)
816 free_anon_bdev(pending_snapshot->anon_dev);
817 kfree(pending_snapshot->root_item);
818 btrfs_free_path(pending_snapshot->path);
819 kfree(pending_snapshot);
824 /* copy of may_delete in fs/namei.c()
825 * Check whether we can remove a link victim from directory dir, check
826 * whether the type of victim is right.
827 * 1. We can't do it if dir is read-only (done in permission())
828 * 2. We should have write and exec permissions on dir
829 * 3. We can't remove anything from append-only dir
830 * 4. We can't do anything with immutable dir (done in permission())
831 * 5. If the sticky bit on dir is set we should either
832 * a. be owner of dir, or
833 * b. be owner of victim, or
834 * c. have CAP_FOWNER capability
835 * 6. If the victim is append-only or immutable we can't do anything with
836 * links pointing to it.
837 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
838 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
839 * 9. We can't remove a root or mountpoint.
840 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
841 * nfs_async_unlink().
844 static int btrfs_may_delete(struct user_namespace *mnt_userns,
845 struct inode *dir, struct dentry *victim, int isdir)
849 if (d_really_is_negative(victim))
852 BUG_ON(d_inode(victim->d_parent) != dir);
853 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
855 error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
860 if (check_sticky(mnt_userns, dir, d_inode(victim)) ||
861 IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
862 IS_SWAPFILE(d_inode(victim)))
865 if (!d_is_dir(victim))
869 } else if (d_is_dir(victim))
873 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
878 /* copy of may_create in fs/namei.c() */
879 static inline int btrfs_may_create(struct user_namespace *mnt_userns,
880 struct inode *dir, struct dentry *child)
882 if (d_really_is_positive(child))
886 if (!fsuidgid_has_mapping(dir->i_sb, mnt_userns))
888 return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
892 * Create a new subvolume below @parent. This is largely modeled after
893 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
894 * inside this filesystem so it's quite a bit simpler.
896 static noinline int btrfs_mksubvol(const struct path *parent,
897 struct user_namespace *mnt_userns,
898 const char *name, int namelen,
899 struct btrfs_root *snap_src,
901 struct btrfs_qgroup_inherit *inherit)
903 struct inode *dir = d_inode(parent->dentry);
904 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
905 struct dentry *dentry;
908 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
912 dentry = lookup_one(mnt_userns, name, parent->dentry, namelen);
913 error = PTR_ERR(dentry);
917 error = btrfs_may_create(mnt_userns, dir, dentry);
922 * even if this name doesn't exist, we may get hash collisions.
923 * check for them now when we can safely fail
925 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
931 down_read(&fs_info->subvol_sem);
933 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
937 error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
939 error = create_subvol(mnt_userns, dir, dentry, name, namelen, inherit);
942 fsnotify_mkdir(dir, dentry);
944 up_read(&fs_info->subvol_sem);
948 btrfs_inode_unlock(dir, 0);
952 static noinline int btrfs_mksnapshot(const struct path *parent,
953 struct user_namespace *mnt_userns,
954 const char *name, int namelen,
955 struct btrfs_root *root,
957 struct btrfs_qgroup_inherit *inherit)
960 bool snapshot_force_cow = false;
963 * Force new buffered writes to reserve space even when NOCOW is
964 * possible. This is to avoid later writeback (running dealloc) to
965 * fallback to COW mode and unexpectedly fail with ENOSPC.
967 btrfs_drew_read_lock(&root->snapshot_lock);
969 ret = btrfs_start_delalloc_snapshot(root, false);
974 * All previous writes have started writeback in NOCOW mode, so now
975 * we force future writes to fallback to COW mode during snapshot
978 atomic_inc(&root->snapshot_force_cow);
979 snapshot_force_cow = true;
981 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
983 ret = btrfs_mksubvol(parent, mnt_userns, name, namelen,
984 root, readonly, inherit);
986 if (snapshot_force_cow)
987 atomic_dec(&root->snapshot_force_cow);
988 btrfs_drew_read_unlock(&root->snapshot_lock);
992 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start,
995 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
996 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
997 struct extent_map *em;
998 const u32 sectorsize = BTRFS_I(inode)->root->fs_info->sectorsize;
1001 * hopefully we have this extent in the tree already, try without
1002 * the full extent lock
1004 read_lock(&em_tree->lock);
1005 em = lookup_extent_mapping(em_tree, start, sectorsize);
1006 read_unlock(&em_tree->lock);
1009 struct extent_state *cached = NULL;
1010 u64 end = start + sectorsize - 1;
1012 /* get the big lock and read metadata off disk */
1014 lock_extent_bits(io_tree, start, end, &cached);
1015 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, sectorsize);
1017 unlock_extent_cached(io_tree, start, end, &cached);
1026 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em,
1029 struct extent_map *next;
1032 /* this is the last extent */
1033 if (em->start + em->len >= i_size_read(inode))
1036 next = defrag_lookup_extent(inode, em->start + em->len, locked);
1037 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1039 else if ((em->block_start + em->block_len == next->block_start) &&
1040 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1043 free_extent_map(next);
1048 * Prepare one page to be defragged.
1052 * - Returned page is locked and has been set up properly.
1053 * - No ordered extent exists in the page.
1054 * - The page is uptodate.
1056 * NOTE: Caller should also wait for page writeback after the cluster is
1057 * prepared, here we don't do writeback wait for each page.
1059 static struct page *defrag_prepare_one_page(struct btrfs_inode *inode,
1062 struct address_space *mapping = inode->vfs_inode.i_mapping;
1063 gfp_t mask = btrfs_alloc_write_mask(mapping);
1064 u64 page_start = (u64)index << PAGE_SHIFT;
1065 u64 page_end = page_start + PAGE_SIZE - 1;
1066 struct extent_state *cached_state = NULL;
1071 page = find_or_create_page(mapping, index, mask);
1073 return ERR_PTR(-ENOMEM);
1076 * Since we can defragment files opened read-only, we can encounter
1077 * transparent huge pages here (see CONFIG_READ_ONLY_THP_FOR_FS). We
1078 * can't do I/O using huge pages yet, so return an error for now.
1079 * Filesystem transparent huge pages are typically only used for
1080 * executables that explicitly enable them, so this isn't very
1083 if (PageCompound(page)) {
1086 return ERR_PTR(-ETXTBSY);
1089 ret = set_page_extent_mapped(page);
1093 return ERR_PTR(ret);
1096 /* Wait for any existing ordered extent in the range */
1098 struct btrfs_ordered_extent *ordered;
1100 lock_extent_bits(&inode->io_tree, page_start, page_end, &cached_state);
1101 ordered = btrfs_lookup_ordered_range(inode, page_start, PAGE_SIZE);
1102 unlock_extent_cached(&inode->io_tree, page_start, page_end,
1108 btrfs_start_ordered_extent(ordered, 1);
1109 btrfs_put_ordered_extent(ordered);
1112 * We unlocked the page above, so we need check if it was
1115 if (page->mapping != mapping || !PagePrivate(page)) {
1123 * Now the page range has no ordered extent any more. Read the page to
1126 if (!PageUptodate(page)) {
1127 btrfs_readpage(NULL, page);
1129 if (page->mapping != mapping || !PagePrivate(page)) {
1134 if (!PageUptodate(page)) {
1137 return ERR_PTR(-EIO);
1143 struct defrag_target_range {
1144 struct list_head list;
1150 * Collect all valid target extents.
1152 * @start: file offset to lookup
1153 * @len: length to lookup
1154 * @extent_thresh: file extent size threshold, any extent size >= this value
1156 * @newer_than: only defrag extents newer than this value
1157 * @do_compress: whether the defrag is doing compression
1158 * if true, @extent_thresh will be ignored and all regular
1159 * file extents meeting @newer_than will be targets.
1160 * @locked: if the range has already held extent lock
1161 * @target_list: list of targets file extents
1163 static int defrag_collect_targets(struct btrfs_inode *inode,
1164 u64 start, u64 len, u32 extent_thresh,
1165 u64 newer_than, bool do_compress,
1166 bool locked, struct list_head *target_list)
1171 while (cur < start + len) {
1172 struct extent_map *em;
1173 struct defrag_target_range *new;
1174 bool next_mergeable = true;
1177 em = defrag_lookup_extent(&inode->vfs_inode, cur, locked);
1181 /* Skip hole/inline/preallocated extents */
1182 if (em->block_start >= EXTENT_MAP_LAST_BYTE ||
1183 test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
1186 /* Skip older extent */
1187 if (em->generation < newer_than)
1191 * For do_compress case, we want to compress all valid file
1192 * extents, thus no @extent_thresh or mergeable check.
1197 /* Skip too large extent */
1198 if (em->len >= extent_thresh)
1201 next_mergeable = defrag_check_next_extent(&inode->vfs_inode, em,
1203 if (!next_mergeable) {
1204 struct defrag_target_range *last;
1206 /* Empty target list, no way to merge with last entry */
1207 if (list_empty(target_list))
1209 last = list_entry(target_list->prev,
1210 struct defrag_target_range, list);
1211 /* Not mergeable with last entry */
1212 if (last->start + last->len != cur)
1215 /* Mergeable, fall through to add it to @target_list. */
1219 range_len = min(extent_map_end(em), start + len) - cur;
1221 * This one is a good target, check if it can be merged into
1222 * last range of the target list.
1224 if (!list_empty(target_list)) {
1225 struct defrag_target_range *last;
1227 last = list_entry(target_list->prev,
1228 struct defrag_target_range, list);
1229 ASSERT(last->start + last->len <= cur);
1230 if (last->start + last->len == cur) {
1231 /* Mergeable, enlarge the last entry */
1232 last->len += range_len;
1235 /* Fall through to allocate a new entry */
1238 /* Allocate new defrag_target_range */
1239 new = kmalloc(sizeof(*new), GFP_NOFS);
1241 free_extent_map(em);
1246 new->len = range_len;
1247 list_add_tail(&new->list, target_list);
1250 cur = extent_map_end(em);
1251 free_extent_map(em);
1254 struct defrag_target_range *entry;
1255 struct defrag_target_range *tmp;
1257 list_for_each_entry_safe(entry, tmp, target_list, list) {
1258 list_del_init(&entry->list);
1265 #define CLUSTER_SIZE (SZ_256K)
1268 * Defrag one contiguous target range.
1270 * @inode: target inode
1271 * @target: target range to defrag
1272 * @pages: locked pages covering the defrag range
1273 * @nr_pages: number of locked pages
1275 * Caller should ensure:
1277 * - Pages are prepared
1278 * Pages should be locked, no ordered extent in the pages range,
1281 * - Extent bits are locked
1283 static int defrag_one_locked_target(struct btrfs_inode *inode,
1284 struct defrag_target_range *target,
1285 struct page **pages, int nr_pages,
1286 struct extent_state **cached_state)
1288 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1289 struct extent_changeset *data_reserved = NULL;
1290 const u64 start = target->start;
1291 const u64 len = target->len;
1292 unsigned long last_index = (start + len - 1) >> PAGE_SHIFT;
1293 unsigned long start_index = start >> PAGE_SHIFT;
1294 unsigned long first_index = page_index(pages[0]);
1298 ASSERT(last_index - first_index + 1 <= nr_pages);
1300 ret = btrfs_delalloc_reserve_space(inode, &data_reserved, start, len);
1303 clear_extent_bit(&inode->io_tree, start, start + len - 1,
1304 EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
1305 EXTENT_DEFRAG, 0, 0, cached_state);
1306 set_extent_defrag(&inode->io_tree, start, start + len - 1, cached_state);
1308 /* Update the page status */
1309 for (i = start_index - first_index; i <= last_index - first_index; i++) {
1310 ClearPageChecked(pages[i]);
1311 btrfs_page_clamp_set_dirty(fs_info, pages[i], start, len);
1313 btrfs_delalloc_release_extents(inode, len);
1314 extent_changeset_free(data_reserved);
1319 static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len,
1320 u32 extent_thresh, u64 newer_than, bool do_compress)
1322 struct extent_state *cached_state = NULL;
1323 struct defrag_target_range *entry;
1324 struct defrag_target_range *tmp;
1325 LIST_HEAD(target_list);
1326 struct page **pages;
1327 const u32 sectorsize = inode->root->fs_info->sectorsize;
1328 u64 last_index = (start + len - 1) >> PAGE_SHIFT;
1329 u64 start_index = start >> PAGE_SHIFT;
1330 unsigned int nr_pages = last_index - start_index + 1;
1334 ASSERT(nr_pages <= CLUSTER_SIZE / PAGE_SIZE);
1335 ASSERT(IS_ALIGNED(start, sectorsize) && IS_ALIGNED(len, sectorsize));
1337 pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
1341 /* Prepare all pages */
1342 for (i = 0; i < nr_pages; i++) {
1343 pages[i] = defrag_prepare_one_page(inode, start_index + i);
1344 if (IS_ERR(pages[i])) {
1345 ret = PTR_ERR(pages[i]);
1350 for (i = 0; i < nr_pages; i++)
1351 wait_on_page_writeback(pages[i]);
1353 /* Lock the pages range */
1354 lock_extent_bits(&inode->io_tree, start_index << PAGE_SHIFT,
1355 (last_index << PAGE_SHIFT) + PAGE_SIZE - 1,
1358 * Now we have a consistent view about the extent map, re-check
1359 * which range really needs to be defragged.
1361 * And this time we have extent locked already, pass @locked = true
1362 * so that we won't relock the extent range and cause deadlock.
1364 ret = defrag_collect_targets(inode, start, len, extent_thresh,
1365 newer_than, do_compress, true,
1370 list_for_each_entry(entry, &target_list, list) {
1371 ret = defrag_one_locked_target(inode, entry, pages, nr_pages,
1377 list_for_each_entry_safe(entry, tmp, &target_list, list) {
1378 list_del_init(&entry->list);
1382 unlock_extent_cached(&inode->io_tree, start_index << PAGE_SHIFT,
1383 (last_index << PAGE_SHIFT) + PAGE_SIZE - 1,
1386 for (i = 0; i < nr_pages; i++) {
1388 unlock_page(pages[i]);
1396 static int defrag_one_cluster(struct btrfs_inode *inode,
1397 struct file_ra_state *ra,
1398 u64 start, u32 len, u32 extent_thresh,
1399 u64 newer_than, bool do_compress,
1400 unsigned long *sectors_defragged,
1401 unsigned long max_sectors)
1403 const u32 sectorsize = inode->root->fs_info->sectorsize;
1404 struct defrag_target_range *entry;
1405 struct defrag_target_range *tmp;
1406 LIST_HEAD(target_list);
1409 BUILD_BUG_ON(!IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE));
1410 ret = defrag_collect_targets(inode, start, len, extent_thresh,
1411 newer_than, do_compress, false,
1416 list_for_each_entry(entry, &target_list, list) {
1417 u32 range_len = entry->len;
1419 /* Reached the limit */
1420 if (max_sectors && max_sectors == *sectors_defragged)
1424 range_len = min_t(u32, range_len,
1425 (max_sectors - *sectors_defragged) * sectorsize);
1428 page_cache_sync_readahead(inode->vfs_inode.i_mapping,
1429 ra, NULL, entry->start >> PAGE_SHIFT,
1430 ((entry->start + range_len - 1) >> PAGE_SHIFT) -
1431 (entry->start >> PAGE_SHIFT) + 1);
1433 * Here we may not defrag any range if holes are punched before
1434 * we locked the pages.
1435 * But that's fine, it only affects the @sectors_defragged
1438 ret = defrag_one_range(inode, entry->start, range_len,
1439 extent_thresh, newer_than, do_compress);
1442 *sectors_defragged += range_len;
1445 list_for_each_entry_safe(entry, tmp, &target_list, list) {
1446 list_del_init(&entry->list);
1453 * Entry point to file defragmentation.
1455 * @inode: inode to be defragged
1456 * @ra: readahead state (can be NUL)
1457 * @range: defrag options including range and flags
1458 * @newer_than: minimum transid to defrag
1459 * @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode
1460 * will be defragged.
1462 int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
1463 struct btrfs_ioctl_defrag_range_args *range,
1464 u64 newer_than, unsigned long max_to_defrag)
1466 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1467 unsigned long sectors_defragged = 0;
1468 u64 isize = i_size_read(inode);
1471 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
1472 bool ra_allocated = false;
1473 int compress_type = BTRFS_COMPRESS_ZLIB;
1475 u32 extent_thresh = range->extent_thresh;
1480 if (range->start >= isize)
1484 if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES)
1486 if (range->compress_type)
1487 compress_type = range->compress_type;
1490 if (extent_thresh == 0)
1491 extent_thresh = SZ_256K;
1493 if (range->start + range->len > range->start) {
1494 /* Got a specific range */
1495 last_byte = min(isize, range->start + range->len) - 1;
1497 /* Defrag until file end */
1498 last_byte = isize - 1;
1502 * If we were not given a ra, allocate a readahead context. As
1503 * readahead is just an optimization, defrag will work without it so
1504 * we don't error out.
1507 ra_allocated = true;
1508 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1510 file_ra_state_init(ra, inode->i_mapping);
1513 /* Align the range */
1514 cur = round_down(range->start, fs_info->sectorsize);
1515 last_byte = round_up(last_byte, fs_info->sectorsize) - 1;
1517 while (cur < last_byte) {
1520 /* The cluster size 256K should always be page aligned */
1521 BUILD_BUG_ON(!IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE));
1523 /* We want the cluster end at page boundary when possible */
1524 cluster_end = (((cur >> PAGE_SHIFT) +
1525 (SZ_256K >> PAGE_SHIFT)) << PAGE_SHIFT) - 1;
1526 cluster_end = min(cluster_end, last_byte);
1528 btrfs_inode_lock(inode, 0);
1529 if (IS_SWAPFILE(inode)) {
1531 btrfs_inode_unlock(inode, 0);
1534 if (!(inode->i_sb->s_flags & SB_ACTIVE)) {
1535 btrfs_inode_unlock(inode, 0);
1539 BTRFS_I(inode)->defrag_compress = compress_type;
1540 ret = defrag_one_cluster(BTRFS_I(inode), ra, cur,
1541 cluster_end + 1 - cur, extent_thresh,
1542 newer_than, do_compress,
1543 §ors_defragged, max_to_defrag);
1544 btrfs_inode_unlock(inode, 0);
1547 cur = cluster_end + 1;
1552 if (sectors_defragged) {
1554 * We have defragged some sectors, for compression case they
1555 * need to be written back immediately.
1557 if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) {
1558 filemap_flush(inode->i_mapping);
1559 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1560 &BTRFS_I(inode)->runtime_flags))
1561 filemap_flush(inode->i_mapping);
1563 if (range->compress_type == BTRFS_COMPRESS_LZO)
1564 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1565 else if (range->compress_type == BTRFS_COMPRESS_ZSTD)
1566 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1567 ret = sectors_defragged;
1570 btrfs_inode_lock(inode, 0);
1571 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
1572 btrfs_inode_unlock(inode, 0);
1578 * Try to start exclusive operation @type or cancel it if it's running.
1581 * 0 - normal mode, newly claimed op started
1582 * >0 - normal mode, something else is running,
1583 * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space
1584 * ECANCELED - cancel mode, successful cancel
1585 * ENOTCONN - cancel mode, operation not running anymore
1587 static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info,
1588 enum btrfs_exclusive_operation type, bool cancel)
1591 /* Start normal op */
1592 if (!btrfs_exclop_start(fs_info, type))
1593 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1594 /* Exclusive operation is now claimed */
1598 /* Cancel running op */
1599 if (btrfs_exclop_start_try_lock(fs_info, type)) {
1601 * This blocks any exclop finish from setting it to NONE, so we
1602 * request cancellation. Either it runs and we will wait for it,
1603 * or it has finished and no waiting will happen.
1605 atomic_inc(&fs_info->reloc_cancel_req);
1606 btrfs_exclop_start_unlock(fs_info);
1608 if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags))
1609 wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING,
1610 TASK_INTERRUPTIBLE);
1615 /* Something else is running or none */
1619 static noinline int btrfs_ioctl_resize(struct file *file,
1622 BTRFS_DEV_LOOKUP_ARGS(args);
1623 struct inode *inode = file_inode(file);
1624 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1628 struct btrfs_root *root = BTRFS_I(inode)->root;
1629 struct btrfs_ioctl_vol_args *vol_args;
1630 struct btrfs_trans_handle *trans;
1631 struct btrfs_device *device = NULL;
1634 char *devstr = NULL;
1639 if (!capable(CAP_SYS_ADMIN))
1642 ret = mnt_want_write_file(file);
1647 * Read the arguments before checking exclusivity to be able to
1648 * distinguish regular resize and cancel
1650 vol_args = memdup_user(arg, sizeof(*vol_args));
1651 if (IS_ERR(vol_args)) {
1652 ret = PTR_ERR(vol_args);
1655 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1656 sizestr = vol_args->name;
1657 cancel = (strcmp("cancel", sizestr) == 0);
1658 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel);
1661 /* Exclusive operation is now claimed */
1663 devstr = strchr(sizestr, ':');
1665 sizestr = devstr + 1;
1667 devstr = vol_args->name;
1668 ret = kstrtoull(devstr, 10, &devid);
1675 btrfs_info(fs_info, "resizing devid %llu", devid);
1679 device = btrfs_find_device(fs_info->fs_devices, &args);
1681 btrfs_info(fs_info, "resizer unable to find device %llu",
1687 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1689 "resizer unable to apply on readonly device %llu",
1695 if (!strcmp(sizestr, "max"))
1696 new_size = bdev_nr_bytes(device->bdev);
1698 if (sizestr[0] == '-') {
1701 } else if (sizestr[0] == '+') {
1705 new_size = memparse(sizestr, &retptr);
1706 if (*retptr != '\0' || new_size == 0) {
1712 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1717 old_size = btrfs_device_get_total_bytes(device);
1720 if (new_size > old_size) {
1724 new_size = old_size - new_size;
1725 } else if (mod > 0) {
1726 if (new_size > ULLONG_MAX - old_size) {
1730 new_size = old_size + new_size;
1733 if (new_size < SZ_256M) {
1737 if (new_size > bdev_nr_bytes(device->bdev)) {
1742 new_size = round_down(new_size, fs_info->sectorsize);
1744 if (new_size > old_size) {
1745 trans = btrfs_start_transaction(root, 0);
1746 if (IS_ERR(trans)) {
1747 ret = PTR_ERR(trans);
1750 ret = btrfs_grow_device(trans, device, new_size);
1751 btrfs_commit_transaction(trans);
1752 } else if (new_size < old_size) {
1753 ret = btrfs_shrink_device(device, new_size);
1754 } /* equal, nothing need to do */
1756 if (ret == 0 && new_size != old_size)
1757 btrfs_info_in_rcu(fs_info,
1758 "resize device %s (devid %llu) from %llu to %llu",
1759 rcu_str_deref(device->name), device->devid,
1760 old_size, new_size);
1762 btrfs_exclop_finish(fs_info);
1766 mnt_drop_write_file(file);
1770 static noinline int __btrfs_ioctl_snap_create(struct file *file,
1771 struct user_namespace *mnt_userns,
1772 const char *name, unsigned long fd, int subvol,
1774 struct btrfs_qgroup_inherit *inherit)
1779 if (!S_ISDIR(file_inode(file)->i_mode))
1782 ret = mnt_want_write_file(file);
1786 namelen = strlen(name);
1787 if (strchr(name, '/')) {
1789 goto out_drop_write;
1792 if (name[0] == '.' &&
1793 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1795 goto out_drop_write;
1799 ret = btrfs_mksubvol(&file->f_path, mnt_userns, name,
1800 namelen, NULL, readonly, inherit);
1802 struct fd src = fdget(fd);
1803 struct inode *src_inode;
1806 goto out_drop_write;
1809 src_inode = file_inode(src.file);
1810 if (src_inode->i_sb != file_inode(file)->i_sb) {
1811 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1812 "Snapshot src from another FS");
1814 } else if (!inode_owner_or_capable(mnt_userns, src_inode)) {
1816 * Subvolume creation is not restricted, but snapshots
1817 * are limited to own subvolumes only
1821 ret = btrfs_mksnapshot(&file->f_path, mnt_userns,
1823 BTRFS_I(src_inode)->root,
1829 mnt_drop_write_file(file);
1834 static noinline int btrfs_ioctl_snap_create(struct file *file,
1835 void __user *arg, int subvol)
1837 struct btrfs_ioctl_vol_args *vol_args;
1840 if (!S_ISDIR(file_inode(file)->i_mode))
1843 vol_args = memdup_user(arg, sizeof(*vol_args));
1844 if (IS_ERR(vol_args))
1845 return PTR_ERR(vol_args);
1846 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1848 ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file),
1849 vol_args->name, vol_args->fd, subvol,
1856 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1857 void __user *arg, int subvol)
1859 struct btrfs_ioctl_vol_args_v2 *vol_args;
1861 bool readonly = false;
1862 struct btrfs_qgroup_inherit *inherit = NULL;
1864 if (!S_ISDIR(file_inode(file)->i_mode))
1867 vol_args = memdup_user(arg, sizeof(*vol_args));
1868 if (IS_ERR(vol_args))
1869 return PTR_ERR(vol_args);
1870 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1872 if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
1877 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1879 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1882 if (vol_args->size < sizeof(*inherit) ||
1883 vol_args->size > PAGE_SIZE) {
1887 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1888 if (IS_ERR(inherit)) {
1889 ret = PTR_ERR(inherit);
1893 if (inherit->num_qgroups > PAGE_SIZE ||
1894 inherit->num_ref_copies > PAGE_SIZE ||
1895 inherit->num_excl_copies > PAGE_SIZE) {
1900 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
1901 2 * inherit->num_excl_copies;
1902 if (vol_args->size != struct_size(inherit, qgroups, nums)) {
1908 ret = __btrfs_ioctl_snap_create(file, file_mnt_user_ns(file),
1909 vol_args->name, vol_args->fd, subvol,
1920 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1923 struct inode *inode = file_inode(file);
1924 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1925 struct btrfs_root *root = BTRFS_I(inode)->root;
1929 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1932 down_read(&fs_info->subvol_sem);
1933 if (btrfs_root_readonly(root))
1934 flags |= BTRFS_SUBVOL_RDONLY;
1935 up_read(&fs_info->subvol_sem);
1937 if (copy_to_user(arg, &flags, sizeof(flags)))
1943 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1946 struct inode *inode = file_inode(file);
1947 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1948 struct btrfs_root *root = BTRFS_I(inode)->root;
1949 struct btrfs_trans_handle *trans;
1954 if (!inode_owner_or_capable(file_mnt_user_ns(file), inode))
1957 ret = mnt_want_write_file(file);
1961 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1963 goto out_drop_write;
1966 if (copy_from_user(&flags, arg, sizeof(flags))) {
1968 goto out_drop_write;
1971 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1973 goto out_drop_write;
1976 down_write(&fs_info->subvol_sem);
1979 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1982 root_flags = btrfs_root_flags(&root->root_item);
1983 if (flags & BTRFS_SUBVOL_RDONLY) {
1984 btrfs_set_root_flags(&root->root_item,
1985 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1988 * Block RO -> RW transition if this subvolume is involved in
1991 spin_lock(&root->root_item_lock);
1992 if (root->send_in_progress == 0) {
1993 btrfs_set_root_flags(&root->root_item,
1994 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1995 spin_unlock(&root->root_item_lock);
1997 spin_unlock(&root->root_item_lock);
1999 "Attempt to set subvolume %llu read-write during send",
2000 root->root_key.objectid);
2006 trans = btrfs_start_transaction(root, 1);
2007 if (IS_ERR(trans)) {
2008 ret = PTR_ERR(trans);
2012 ret = btrfs_update_root(trans, fs_info->tree_root,
2013 &root->root_key, &root->root_item);
2015 btrfs_end_transaction(trans);
2019 ret = btrfs_commit_transaction(trans);
2023 btrfs_set_root_flags(&root->root_item, root_flags);
2025 up_write(&fs_info->subvol_sem);
2027 mnt_drop_write_file(file);
2032 static noinline int key_in_sk(struct btrfs_key *key,
2033 struct btrfs_ioctl_search_key *sk)
2035 struct btrfs_key test;
2038 test.objectid = sk->min_objectid;
2039 test.type = sk->min_type;
2040 test.offset = sk->min_offset;
2042 ret = btrfs_comp_cpu_keys(key, &test);
2046 test.objectid = sk->max_objectid;
2047 test.type = sk->max_type;
2048 test.offset = sk->max_offset;
2050 ret = btrfs_comp_cpu_keys(key, &test);
2056 static noinline int copy_to_sk(struct btrfs_path *path,
2057 struct btrfs_key *key,
2058 struct btrfs_ioctl_search_key *sk,
2061 unsigned long *sk_offset,
2065 struct extent_buffer *leaf;
2066 struct btrfs_ioctl_search_header sh;
2067 struct btrfs_key test;
2068 unsigned long item_off;
2069 unsigned long item_len;
2075 leaf = path->nodes[0];
2076 slot = path->slots[0];
2077 nritems = btrfs_header_nritems(leaf);
2079 if (btrfs_header_generation(leaf) > sk->max_transid) {
2083 found_transid = btrfs_header_generation(leaf);
2085 for (i = slot; i < nritems; i++) {
2086 item_off = btrfs_item_ptr_offset(leaf, i);
2087 item_len = btrfs_item_size(leaf, i);
2089 btrfs_item_key_to_cpu(leaf, key, i);
2090 if (!key_in_sk(key, sk))
2093 if (sizeof(sh) + item_len > *buf_size) {
2100 * return one empty item back for v1, which does not
2104 *buf_size = sizeof(sh) + item_len;
2109 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2114 sh.objectid = key->objectid;
2115 sh.offset = key->offset;
2116 sh.type = key->type;
2118 sh.transid = found_transid;
2121 * Copy search result header. If we fault then loop again so we
2122 * can fault in the pages and -EFAULT there if there's a
2123 * problem. Otherwise we'll fault and then copy the buffer in
2124 * properly this next time through
2126 if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
2131 *sk_offset += sizeof(sh);
2134 char __user *up = ubuf + *sk_offset;
2136 * Copy the item, same behavior as above, but reset the
2137 * * sk_offset so we copy the full thing again.
2139 if (read_extent_buffer_to_user_nofault(leaf, up,
2140 item_off, item_len)) {
2142 *sk_offset -= sizeof(sh);
2146 *sk_offset += item_len;
2150 if (ret) /* -EOVERFLOW from above */
2153 if (*num_found >= sk->nr_items) {
2160 test.objectid = sk->max_objectid;
2161 test.type = sk->max_type;
2162 test.offset = sk->max_offset;
2163 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2165 else if (key->offset < (u64)-1)
2167 else if (key->type < (u8)-1) {
2170 } else if (key->objectid < (u64)-1) {
2178 * 0: all items from this leaf copied, continue with next
2179 * 1: * more items can be copied, but unused buffer is too small
2180 * * all items were found
2181 * Either way, it will stops the loop which iterates to the next
2183 * -EOVERFLOW: item was to large for buffer
2184 * -EFAULT: could not copy extent buffer back to userspace
2189 static noinline int search_ioctl(struct inode *inode,
2190 struct btrfs_ioctl_search_key *sk,
2194 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
2195 struct btrfs_root *root;
2196 struct btrfs_key key;
2197 struct btrfs_path *path;
2200 unsigned long sk_offset = 0;
2202 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2203 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2207 path = btrfs_alloc_path();
2211 if (sk->tree_id == 0) {
2212 /* search the root of the inode that was passed */
2213 root = btrfs_grab_root(BTRFS_I(inode)->root);
2215 root = btrfs_get_fs_root(info, sk->tree_id, true);
2217 btrfs_free_path(path);
2218 return PTR_ERR(root);
2222 key.objectid = sk->min_objectid;
2223 key.type = sk->min_type;
2224 key.offset = sk->min_offset;
2228 if (fault_in_writeable(ubuf + sk_offset, *buf_size - sk_offset))
2231 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2237 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
2238 &sk_offset, &num_found);
2239 btrfs_release_path(path);
2247 sk->nr_items = num_found;
2248 btrfs_put_root(root);
2249 btrfs_free_path(path);
2253 static noinline int btrfs_ioctl_tree_search(struct file *file,
2256 struct btrfs_ioctl_search_args __user *uargs;
2257 struct btrfs_ioctl_search_key sk;
2258 struct inode *inode;
2262 if (!capable(CAP_SYS_ADMIN))
2265 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2267 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2270 buf_size = sizeof(uargs->buf);
2272 inode = file_inode(file);
2273 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2276 * In the origin implementation an overflow is handled by returning a
2277 * search header with a len of zero, so reset ret.
2279 if (ret == -EOVERFLOW)
2282 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2287 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2290 struct btrfs_ioctl_search_args_v2 __user *uarg;
2291 struct btrfs_ioctl_search_args_v2 args;
2292 struct inode *inode;
2295 const size_t buf_limit = SZ_16M;
2297 if (!capable(CAP_SYS_ADMIN))
2300 /* copy search header and buffer size */
2301 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2302 if (copy_from_user(&args, uarg, sizeof(args)))
2305 buf_size = args.buf_size;
2307 /* limit result size to 16MB */
2308 if (buf_size > buf_limit)
2309 buf_size = buf_limit;
2311 inode = file_inode(file);
2312 ret = search_ioctl(inode, &args.key, &buf_size,
2313 (char __user *)(&uarg->buf[0]));
2314 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2316 else if (ret == -EOVERFLOW &&
2317 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2324 * Search INODE_REFs to identify path name of 'dirid' directory
2325 * in a 'tree_id' tree. and sets path name to 'name'.
2327 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2328 u64 tree_id, u64 dirid, char *name)
2330 struct btrfs_root *root;
2331 struct btrfs_key key;
2337 struct btrfs_inode_ref *iref;
2338 struct extent_buffer *l;
2339 struct btrfs_path *path;
2341 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2346 path = btrfs_alloc_path();
2350 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
2352 root = btrfs_get_fs_root(info, tree_id, true);
2354 ret = PTR_ERR(root);
2359 key.objectid = dirid;
2360 key.type = BTRFS_INODE_REF_KEY;
2361 key.offset = (u64)-1;
2364 ret = btrfs_search_backwards(root, &key, path);
2373 slot = path->slots[0];
2375 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2376 len = btrfs_inode_ref_name_len(l, iref);
2378 total_len += len + 1;
2380 ret = -ENAMETOOLONG;
2385 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2387 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2390 btrfs_release_path(path);
2391 key.objectid = key.offset;
2392 key.offset = (u64)-1;
2393 dirid = key.objectid;
2395 memmove(name, ptr, total_len);
2396 name[total_len] = '\0';
2399 btrfs_put_root(root);
2400 btrfs_free_path(path);
2404 static int btrfs_search_path_in_tree_user(struct user_namespace *mnt_userns,
2405 struct inode *inode,
2406 struct btrfs_ioctl_ino_lookup_user_args *args)
2408 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2409 struct super_block *sb = inode->i_sb;
2410 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2411 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2412 u64 dirid = args->dirid;
2413 unsigned long item_off;
2414 unsigned long item_len;
2415 struct btrfs_inode_ref *iref;
2416 struct btrfs_root_ref *rref;
2417 struct btrfs_root *root = NULL;
2418 struct btrfs_path *path;
2419 struct btrfs_key key, key2;
2420 struct extent_buffer *leaf;
2421 struct inode *temp_inode;
2428 path = btrfs_alloc_path();
2433 * If the bottom subvolume does not exist directly under upper_limit,
2434 * construct the path in from the bottom up.
2436 if (dirid != upper_limit.objectid) {
2437 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2439 root = btrfs_get_fs_root(fs_info, treeid, true);
2441 ret = PTR_ERR(root);
2445 key.objectid = dirid;
2446 key.type = BTRFS_INODE_REF_KEY;
2447 key.offset = (u64)-1;
2449 ret = btrfs_search_backwards(root, &key, path);
2457 leaf = path->nodes[0];
2458 slot = path->slots[0];
2460 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2461 len = btrfs_inode_ref_name_len(leaf, iref);
2463 total_len += len + 1;
2464 if (ptr < args->path) {
2465 ret = -ENAMETOOLONG;
2470 read_extent_buffer(leaf, ptr,
2471 (unsigned long)(iref + 1), len);
2473 /* Check the read+exec permission of this directory */
2474 ret = btrfs_previous_item(root, path, dirid,
2475 BTRFS_INODE_ITEM_KEY);
2478 } else if (ret > 0) {
2483 leaf = path->nodes[0];
2484 slot = path->slots[0];
2485 btrfs_item_key_to_cpu(leaf, &key2, slot);
2486 if (key2.objectid != dirid) {
2491 temp_inode = btrfs_iget(sb, key2.objectid, root);
2492 if (IS_ERR(temp_inode)) {
2493 ret = PTR_ERR(temp_inode);
2496 ret = inode_permission(mnt_userns, temp_inode,
2497 MAY_READ | MAY_EXEC);
2504 if (key.offset == upper_limit.objectid)
2506 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2511 btrfs_release_path(path);
2512 key.objectid = key.offset;
2513 key.offset = (u64)-1;
2514 dirid = key.objectid;
2517 memmove(args->path, ptr, total_len);
2518 args->path[total_len] = '\0';
2519 btrfs_put_root(root);
2521 btrfs_release_path(path);
2524 /* Get the bottom subvolume's name from ROOT_REF */
2525 key.objectid = treeid;
2526 key.type = BTRFS_ROOT_REF_KEY;
2527 key.offset = args->treeid;
2528 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2531 } else if (ret > 0) {
2536 leaf = path->nodes[0];
2537 slot = path->slots[0];
2538 btrfs_item_key_to_cpu(leaf, &key, slot);
2540 item_off = btrfs_item_ptr_offset(leaf, slot);
2541 item_len = btrfs_item_size(leaf, slot);
2542 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2543 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2544 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2549 /* Copy subvolume's name */
2550 item_off += sizeof(struct btrfs_root_ref);
2551 item_len -= sizeof(struct btrfs_root_ref);
2552 read_extent_buffer(leaf, args->name, item_off, item_len);
2553 args->name[item_len] = 0;
2556 btrfs_put_root(root);
2558 btrfs_free_path(path);
2562 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2565 struct btrfs_ioctl_ino_lookup_args *args;
2566 struct inode *inode;
2569 args = memdup_user(argp, sizeof(*args));
2571 return PTR_ERR(args);
2573 inode = file_inode(file);
2576 * Unprivileged query to obtain the containing subvolume root id. The
2577 * path is reset so it's consistent with btrfs_search_path_in_tree.
2579 if (args->treeid == 0)
2580 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2582 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2587 if (!capable(CAP_SYS_ADMIN)) {
2592 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2593 args->treeid, args->objectid,
2597 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2605 * Version of ino_lookup ioctl (unprivileged)
2607 * The main differences from ino_lookup ioctl are:
2609 * 1. Read + Exec permission will be checked using inode_permission() during
2610 * path construction. -EACCES will be returned in case of failure.
2611 * 2. Path construction will be stopped at the inode number which corresponds
2612 * to the fd with which this ioctl is called. If constructed path does not
2613 * exist under fd's inode, -EACCES will be returned.
2614 * 3. The name of bottom subvolume is also searched and filled.
2616 static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2618 struct btrfs_ioctl_ino_lookup_user_args *args;
2619 struct inode *inode;
2622 args = memdup_user(argp, sizeof(*args));
2624 return PTR_ERR(args);
2626 inode = file_inode(file);
2628 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2629 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2631 * The subvolume does not exist under fd with which this is
2638 ret = btrfs_search_path_in_tree_user(file_mnt_user_ns(file), inode, args);
2640 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2647 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2648 static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2650 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2651 struct btrfs_fs_info *fs_info;
2652 struct btrfs_root *root;
2653 struct btrfs_path *path;
2654 struct btrfs_key key;
2655 struct btrfs_root_item *root_item;
2656 struct btrfs_root_ref *rref;
2657 struct extent_buffer *leaf;
2658 unsigned long item_off;
2659 unsigned long item_len;
2660 struct inode *inode;
2664 path = btrfs_alloc_path();
2668 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2670 btrfs_free_path(path);
2674 inode = file_inode(file);
2675 fs_info = BTRFS_I(inode)->root->fs_info;
2677 /* Get root_item of inode's subvolume */
2678 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2679 root = btrfs_get_fs_root(fs_info, key.objectid, true);
2681 ret = PTR_ERR(root);
2684 root_item = &root->root_item;
2686 subvol_info->treeid = key.objectid;
2688 subvol_info->generation = btrfs_root_generation(root_item);
2689 subvol_info->flags = btrfs_root_flags(root_item);
2691 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2692 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2694 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2697 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2698 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2699 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2701 subvol_info->otransid = btrfs_root_otransid(root_item);
2702 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2703 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2705 subvol_info->stransid = btrfs_root_stransid(root_item);
2706 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2707 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2709 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2710 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2711 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2713 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2714 /* Search root tree for ROOT_BACKREF of this subvolume */
2715 key.type = BTRFS_ROOT_BACKREF_KEY;
2717 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2720 } else if (path->slots[0] >=
2721 btrfs_header_nritems(path->nodes[0])) {
2722 ret = btrfs_next_leaf(fs_info->tree_root, path);
2725 } else if (ret > 0) {
2731 leaf = path->nodes[0];
2732 slot = path->slots[0];
2733 btrfs_item_key_to_cpu(leaf, &key, slot);
2734 if (key.objectid == subvol_info->treeid &&
2735 key.type == BTRFS_ROOT_BACKREF_KEY) {
2736 subvol_info->parent_id = key.offset;
2738 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2739 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2741 item_off = btrfs_item_ptr_offset(leaf, slot)
2742 + sizeof(struct btrfs_root_ref);
2743 item_len = btrfs_item_size(leaf, slot)
2744 - sizeof(struct btrfs_root_ref);
2745 read_extent_buffer(leaf, subvol_info->name,
2746 item_off, item_len);
2753 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2757 btrfs_put_root(root);
2759 btrfs_free_path(path);
2765 * Return ROOT_REF information of the subvolume containing this inode
2766 * except the subvolume name.
2768 static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2770 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2771 struct btrfs_root_ref *rref;
2772 struct btrfs_root *root;
2773 struct btrfs_path *path;
2774 struct btrfs_key key;
2775 struct extent_buffer *leaf;
2776 struct inode *inode;
2782 path = btrfs_alloc_path();
2786 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2787 if (IS_ERR(rootrefs)) {
2788 btrfs_free_path(path);
2789 return PTR_ERR(rootrefs);
2792 inode = file_inode(file);
2793 root = BTRFS_I(inode)->root->fs_info->tree_root;
2794 objectid = BTRFS_I(inode)->root->root_key.objectid;
2796 key.objectid = objectid;
2797 key.type = BTRFS_ROOT_REF_KEY;
2798 key.offset = rootrefs->min_treeid;
2801 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2804 } else if (path->slots[0] >=
2805 btrfs_header_nritems(path->nodes[0])) {
2806 ret = btrfs_next_leaf(root, path);
2809 } else if (ret > 0) {
2815 leaf = path->nodes[0];
2816 slot = path->slots[0];
2818 btrfs_item_key_to_cpu(leaf, &key, slot);
2819 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2824 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2829 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2830 rootrefs->rootref[found].treeid = key.offset;
2831 rootrefs->rootref[found].dirid =
2832 btrfs_root_ref_dirid(leaf, rref);
2835 ret = btrfs_next_item(root, path);
2838 } else if (ret > 0) {
2845 if (!ret || ret == -EOVERFLOW) {
2846 rootrefs->num_items = found;
2847 /* update min_treeid for next search */
2849 rootrefs->min_treeid =
2850 rootrefs->rootref[found - 1].treeid + 1;
2851 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2856 btrfs_free_path(path);
2861 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2865 struct dentry *parent = file->f_path.dentry;
2866 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2867 struct dentry *dentry;
2868 struct inode *dir = d_inode(parent);
2869 struct inode *inode;
2870 struct btrfs_root *root = BTRFS_I(dir)->root;
2871 struct btrfs_root *dest = NULL;
2872 struct btrfs_ioctl_vol_args *vol_args = NULL;
2873 struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
2874 struct user_namespace *mnt_userns = file_mnt_user_ns(file);
2875 char *subvol_name, *subvol_name_ptr = NULL;
2878 bool destroy_parent = false;
2881 vol_args2 = memdup_user(arg, sizeof(*vol_args2));
2882 if (IS_ERR(vol_args2))
2883 return PTR_ERR(vol_args2);
2885 if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
2891 * If SPEC_BY_ID is not set, we are looking for the subvolume by
2892 * name, same as v1 currently does.
2894 if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
2895 vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0;
2896 subvol_name = vol_args2->name;
2898 err = mnt_want_write_file(file);
2902 struct inode *old_dir;
2904 if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
2909 err = mnt_want_write_file(file);
2913 dentry = btrfs_get_dentry(fs_info->sb,
2914 BTRFS_FIRST_FREE_OBJECTID,
2915 vol_args2->subvolid, 0, 0);
2916 if (IS_ERR(dentry)) {
2917 err = PTR_ERR(dentry);
2918 goto out_drop_write;
2922 * Change the default parent since the subvolume being
2923 * deleted can be outside of the current mount point.
2925 parent = btrfs_get_parent(dentry);
2928 * At this point dentry->d_name can point to '/' if the
2929 * subvolume we want to destroy is outsite of the
2930 * current mount point, so we need to release the
2931 * current dentry and execute the lookup to return a new
2932 * one with ->d_name pointing to the
2933 * <mount point>/subvol_name.
2936 if (IS_ERR(parent)) {
2937 err = PTR_ERR(parent);
2938 goto out_drop_write;
2941 dir = d_inode(parent);
2944 * If v2 was used with SPEC_BY_ID, a new parent was
2945 * allocated since the subvolume can be outside of the
2946 * current mount point. Later on we need to release this
2947 * new parent dentry.
2949 destroy_parent = true;
2952 * On idmapped mounts, deletion via subvolid is
2953 * restricted to subvolumes that are immediate
2954 * ancestors of the inode referenced by the file
2955 * descriptor in the ioctl. Otherwise the idmapping
2956 * could potentially be abused to delete subvolumes
2957 * anywhere in the filesystem the user wouldn't be able
2958 * to delete without an idmapped mount.
2960 if (old_dir != dir && mnt_userns != &init_user_ns) {
2965 subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
2966 fs_info, vol_args2->subvolid);
2967 if (IS_ERR(subvol_name_ptr)) {
2968 err = PTR_ERR(subvol_name_ptr);
2971 /* subvol_name_ptr is already nul terminated */
2972 subvol_name = (char *)kbasename(subvol_name_ptr);
2975 vol_args = memdup_user(arg, sizeof(*vol_args));
2976 if (IS_ERR(vol_args))
2977 return PTR_ERR(vol_args);
2979 vol_args->name[BTRFS_PATH_NAME_MAX] = 0;
2980 subvol_name = vol_args->name;
2982 err = mnt_want_write_file(file);
2987 subvol_namelen = strlen(subvol_name);
2989 if (strchr(subvol_name, '/') ||
2990 strncmp(subvol_name, "..", subvol_namelen) == 0) {
2992 goto free_subvol_name;
2995 if (!S_ISDIR(dir->i_mode)) {
2997 goto free_subvol_name;
3000 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
3002 goto free_subvol_name;
3003 dentry = lookup_one(mnt_userns, subvol_name, parent, subvol_namelen);
3004 if (IS_ERR(dentry)) {
3005 err = PTR_ERR(dentry);
3006 goto out_unlock_dir;
3009 if (d_really_is_negative(dentry)) {
3014 inode = d_inode(dentry);
3015 dest = BTRFS_I(inode)->root;
3016 if (!capable(CAP_SYS_ADMIN)) {
3018 * Regular user. Only allow this with a special mount
3019 * option, when the user has write+exec access to the
3020 * subvol root, and when rmdir(2) would have been
3023 * Note that this is _not_ check that the subvol is
3024 * empty or doesn't contain data that we wouldn't
3025 * otherwise be able to delete.
3027 * Users who want to delete empty subvols should try
3031 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
3035 * Do not allow deletion if the parent dir is the same
3036 * as the dir to be deleted. That means the ioctl
3037 * must be called on the dentry referencing the root
3038 * of the subvol, not a random directory contained
3045 err = inode_permission(mnt_userns, inode, MAY_WRITE | MAY_EXEC);
3050 /* check if subvolume may be deleted by a user */
3051 err = btrfs_may_delete(mnt_userns, dir, dentry, 1);
3055 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
3060 btrfs_inode_lock(inode, 0);
3061 err = btrfs_delete_subvolume(dir, dentry);
3062 btrfs_inode_unlock(inode, 0);
3064 fsnotify_rmdir(dir, dentry);
3071 btrfs_inode_unlock(dir, 0);
3073 kfree(subvol_name_ptr);
3078 mnt_drop_write_file(file);
3085 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
3087 struct inode *inode = file_inode(file);
3088 struct btrfs_root *root = BTRFS_I(inode)->root;
3089 struct btrfs_ioctl_defrag_range_args range = {0};
3092 ret = mnt_want_write_file(file);
3096 if (btrfs_root_readonly(root)) {
3101 switch (inode->i_mode & S_IFMT) {
3103 if (!capable(CAP_SYS_ADMIN)) {
3107 ret = btrfs_defrag_root(root);
3111 * Note that this does not check the file descriptor for write
3112 * access. This prevents defragmenting executables that are
3113 * running and allows defrag on files open in read-only mode.
3115 if (!capable(CAP_SYS_ADMIN) &&
3116 inode_permission(&init_user_ns, inode, MAY_WRITE)) {
3122 if (copy_from_user(&range, argp, sizeof(range))) {
3126 /* compression requires us to start the IO */
3127 if ((range.flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
3128 range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
3129 range.extent_thresh = (u32)-1;
3132 /* the rest are all set to zero by kzalloc */
3133 range.len = (u64)-1;
3135 ret = btrfs_defrag_file(file_inode(file), &file->f_ra,
3136 &range, BTRFS_OLDEST_GENERATION, 0);
3144 mnt_drop_write_file(file);
3148 static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
3150 struct btrfs_ioctl_vol_args *vol_args;
3153 if (!capable(CAP_SYS_ADMIN))
3156 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD))
3157 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3159 vol_args = memdup_user(arg, sizeof(*vol_args));
3160 if (IS_ERR(vol_args)) {
3161 ret = PTR_ERR(vol_args);
3165 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3166 ret = btrfs_init_new_device(fs_info, vol_args->name);
3169 btrfs_info(fs_info, "disk added %s", vol_args->name);
3173 btrfs_exclop_finish(fs_info);
3177 static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
3179 BTRFS_DEV_LOOKUP_ARGS(args);
3180 struct inode *inode = file_inode(file);
3181 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3182 struct btrfs_ioctl_vol_args_v2 *vol_args;
3183 struct block_device *bdev = NULL;
3186 bool cancel = false;
3188 if (!capable(CAP_SYS_ADMIN))
3191 vol_args = memdup_user(arg, sizeof(*vol_args));
3192 if (IS_ERR(vol_args))
3193 return PTR_ERR(vol_args);
3195 if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
3200 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
3201 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
3202 args.devid = vol_args->devid;
3203 } else if (!strcmp("cancel", vol_args->name)) {
3206 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
3211 ret = mnt_want_write_file(file);
3215 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
3220 /* Exclusive operation is now claimed */
3221 ret = btrfs_rm_device(fs_info, &args, &bdev, &mode);
3223 btrfs_exclop_finish(fs_info);
3226 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3227 btrfs_info(fs_info, "device deleted: id %llu",
3230 btrfs_info(fs_info, "device deleted: %s",
3234 mnt_drop_write_file(file);
3236 blkdev_put(bdev, mode);
3238 btrfs_put_dev_args_from_path(&args);
3243 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
3245 BTRFS_DEV_LOOKUP_ARGS(args);
3246 struct inode *inode = file_inode(file);
3247 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3248 struct btrfs_ioctl_vol_args *vol_args;
3249 struct block_device *bdev = NULL;
3254 if (!capable(CAP_SYS_ADMIN))
3257 vol_args = memdup_user(arg, sizeof(*vol_args));
3258 if (IS_ERR(vol_args))
3259 return PTR_ERR(vol_args);
3261 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3262 if (!strcmp("cancel", vol_args->name)) {
3265 ret = btrfs_get_dev_args_from_path(fs_info, &args, vol_args->name);
3270 ret = mnt_want_write_file(file);
3274 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
3277 ret = btrfs_rm_device(fs_info, &args, &bdev, &mode);
3279 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
3280 btrfs_exclop_finish(fs_info);
3283 mnt_drop_write_file(file);
3285 blkdev_put(bdev, mode);
3287 btrfs_put_dev_args_from_path(&args);
3292 static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3295 struct btrfs_ioctl_fs_info_args *fi_args;
3296 struct btrfs_device *device;
3297 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
3301 fi_args = memdup_user(arg, sizeof(*fi_args));
3302 if (IS_ERR(fi_args))
3303 return PTR_ERR(fi_args);
3305 flags_in = fi_args->flags;
3306 memset(fi_args, 0, sizeof(*fi_args));
3309 fi_args->num_devices = fs_devices->num_devices;
3311 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
3312 if (device->devid > fi_args->max_id)
3313 fi_args->max_id = device->devid;
3317 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
3318 fi_args->nodesize = fs_info->nodesize;
3319 fi_args->sectorsize = fs_info->sectorsize;
3320 fi_args->clone_alignment = fs_info->sectorsize;
3322 if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
3323 fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
3324 fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
3325 fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
3328 if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
3329 fi_args->generation = fs_info->generation;
3330 fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
3333 if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
3334 memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
3335 sizeof(fi_args->metadata_uuid));
3336 fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
3339 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3346 static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3349 BTRFS_DEV_LOOKUP_ARGS(args);
3350 struct btrfs_ioctl_dev_info_args *di_args;
3351 struct btrfs_device *dev;
3354 di_args = memdup_user(arg, sizeof(*di_args));
3355 if (IS_ERR(di_args))
3356 return PTR_ERR(di_args);
3358 args.devid = di_args->devid;
3359 if (!btrfs_is_empty_uuid(di_args->uuid))
3360 args.uuid = di_args->uuid;
3363 dev = btrfs_find_device(fs_info->fs_devices, &args);
3369 di_args->devid = dev->devid;
3370 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3371 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
3372 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
3374 strncpy(di_args->path, rcu_str_deref(dev->name),
3375 sizeof(di_args->path) - 1);
3376 di_args->path[sizeof(di_args->path) - 1] = 0;
3378 di_args->path[0] = '\0';
3383 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3390 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3392 struct inode *inode = file_inode(file);
3393 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3394 struct btrfs_root *root = BTRFS_I(inode)->root;
3395 struct btrfs_root *new_root;
3396 struct btrfs_dir_item *di;
3397 struct btrfs_trans_handle *trans;
3398 struct btrfs_path *path = NULL;
3399 struct btrfs_disk_key disk_key;
3404 if (!capable(CAP_SYS_ADMIN))
3407 ret = mnt_want_write_file(file);
3411 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3417 objectid = BTRFS_FS_TREE_OBJECTID;
3419 new_root = btrfs_get_fs_root(fs_info, objectid, true);
3420 if (IS_ERR(new_root)) {
3421 ret = PTR_ERR(new_root);
3424 if (!is_fstree(new_root->root_key.objectid)) {
3429 path = btrfs_alloc_path();
3435 trans = btrfs_start_transaction(root, 1);
3436 if (IS_ERR(trans)) {
3437 ret = PTR_ERR(trans);
3441 dir_id = btrfs_super_root_dir(fs_info->super_copy);
3442 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
3443 dir_id, "default", 7, 1);
3444 if (IS_ERR_OR_NULL(di)) {
3445 btrfs_release_path(path);
3446 btrfs_end_transaction(trans);
3448 "Umm, you don't have the default diritem, this isn't going to work");
3453 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3454 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3455 btrfs_mark_buffer_dirty(path->nodes[0]);
3456 btrfs_release_path(path);
3458 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
3459 btrfs_end_transaction(trans);
3461 btrfs_put_root(new_root);
3462 btrfs_free_path(path);
3464 mnt_drop_write_file(file);
3468 static void get_block_group_info(struct list_head *groups_list,
3469 struct btrfs_ioctl_space_info *space)
3471 struct btrfs_block_group *block_group;
3473 space->total_bytes = 0;
3474 space->used_bytes = 0;
3476 list_for_each_entry(block_group, groups_list, list) {
3477 space->flags = block_group->flags;
3478 space->total_bytes += block_group->length;
3479 space->used_bytes += block_group->used;
3483 static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
3486 struct btrfs_ioctl_space_args space_args;
3487 struct btrfs_ioctl_space_info space;
3488 struct btrfs_ioctl_space_info *dest;
3489 struct btrfs_ioctl_space_info *dest_orig;
3490 struct btrfs_ioctl_space_info __user *user_dest;
3491 struct btrfs_space_info *info;
3492 static const u64 types[] = {
3493 BTRFS_BLOCK_GROUP_DATA,
3494 BTRFS_BLOCK_GROUP_SYSTEM,
3495 BTRFS_BLOCK_GROUP_METADATA,
3496 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
3504 if (copy_from_user(&space_args,
3505 (struct btrfs_ioctl_space_args __user *)arg,
3506 sizeof(space_args)))
3509 for (i = 0; i < num_types; i++) {
3510 struct btrfs_space_info *tmp;
3513 list_for_each_entry(tmp, &fs_info->space_info, list) {
3514 if (tmp->flags == types[i]) {
3523 down_read(&info->groups_sem);
3524 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3525 if (!list_empty(&info->block_groups[c]))
3528 up_read(&info->groups_sem);
3532 * Global block reserve, exported as a space_info
3536 /* space_slots == 0 means they are asking for a count */
3537 if (space_args.space_slots == 0) {
3538 space_args.total_spaces = slot_count;
3542 slot_count = min_t(u64, space_args.space_slots, slot_count);
3544 alloc_size = sizeof(*dest) * slot_count;
3546 /* we generally have at most 6 or so space infos, one for each raid
3547 * level. So, a whole page should be more than enough for everyone
3549 if (alloc_size > PAGE_SIZE)
3552 space_args.total_spaces = 0;
3553 dest = kmalloc(alloc_size, GFP_KERNEL);
3558 /* now we have a buffer to copy into */
3559 for (i = 0; i < num_types; i++) {
3560 struct btrfs_space_info *tmp;
3566 list_for_each_entry(tmp, &fs_info->space_info, list) {
3567 if (tmp->flags == types[i]) {
3575 down_read(&info->groups_sem);
3576 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3577 if (!list_empty(&info->block_groups[c])) {
3578 get_block_group_info(&info->block_groups[c],
3580 memcpy(dest, &space, sizeof(space));
3582 space_args.total_spaces++;
3588 up_read(&info->groups_sem);
3592 * Add global block reserve
3595 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
3597 spin_lock(&block_rsv->lock);
3598 space.total_bytes = block_rsv->size;
3599 space.used_bytes = block_rsv->size - block_rsv->reserved;
3600 spin_unlock(&block_rsv->lock);
3601 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3602 memcpy(dest, &space, sizeof(space));
3603 space_args.total_spaces++;
3606 user_dest = (struct btrfs_ioctl_space_info __user *)
3607 (arg + sizeof(struct btrfs_ioctl_space_args));
3609 if (copy_to_user(user_dest, dest_orig, alloc_size))
3614 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3620 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3623 struct btrfs_trans_handle *trans;
3626 trans = btrfs_attach_transaction_barrier(root);
3627 if (IS_ERR(trans)) {
3628 if (PTR_ERR(trans) != -ENOENT)
3629 return PTR_ERR(trans);
3631 /* No running transaction, don't bother */
3632 transid = root->fs_info->last_trans_committed;
3635 transid = trans->transid;
3636 btrfs_commit_transaction_async(trans);
3639 if (copy_to_user(argp, &transid, sizeof(transid)))
3644 static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
3650 if (copy_from_user(&transid, argp, sizeof(transid)))
3653 transid = 0; /* current trans */
3655 return btrfs_wait_for_commit(fs_info, transid);
3658 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3660 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
3661 struct btrfs_ioctl_scrub_args *sa;
3664 if (!capable(CAP_SYS_ADMIN))
3667 sa = memdup_user(arg, sizeof(*sa));
3671 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3672 ret = mnt_want_write_file(file);
3677 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
3678 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3682 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
3683 * error. This is important as it allows user space to know how much
3684 * progress scrub has done. For example, if scrub is canceled we get
3685 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
3686 * space. Later user space can inspect the progress from the structure
3687 * btrfs_ioctl_scrub_args and resume scrub from where it left off
3688 * previously (btrfs-progs does this).
3689 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
3690 * then return -EFAULT to signal the structure was not copied or it may
3691 * be corrupt and unreliable due to a partial copy.
3693 if (copy_to_user(arg, sa, sizeof(*sa)))
3696 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3697 mnt_drop_write_file(file);
3703 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
3705 if (!capable(CAP_SYS_ADMIN))
3708 return btrfs_scrub_cancel(fs_info);
3711 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
3714 struct btrfs_ioctl_scrub_args *sa;
3717 if (!capable(CAP_SYS_ADMIN))
3720 sa = memdup_user(arg, sizeof(*sa));
3724 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
3726 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3733 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
3736 struct btrfs_ioctl_get_dev_stats *sa;
3739 sa = memdup_user(arg, sizeof(*sa));
3743 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3748 ret = btrfs_get_dev_stats(fs_info, sa);
3750 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3757 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
3760 struct btrfs_ioctl_dev_replace_args *p;
3763 if (!capable(CAP_SYS_ADMIN))
3766 p = memdup_user(arg, sizeof(*p));
3771 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3772 if (sb_rdonly(fs_info->sb)) {
3776 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
3777 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3779 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
3780 btrfs_exclop_finish(fs_info);
3783 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3784 btrfs_dev_replace_status(fs_info, p);
3787 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3788 p->result = btrfs_dev_replace_cancel(fs_info);
3796 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3803 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3809 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3810 struct inode_fs_paths *ipath = NULL;
3811 struct btrfs_path *path;
3813 if (!capable(CAP_DAC_READ_SEARCH))
3816 path = btrfs_alloc_path();
3822 ipa = memdup_user(arg, sizeof(*ipa));
3829 size = min_t(u32, ipa->size, 4096);
3830 ipath = init_ipath(size, root, path);
3831 if (IS_ERR(ipath)) {
3832 ret = PTR_ERR(ipath);
3837 ret = paths_from_inode(ipa->inum, ipath);
3841 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3842 rel_ptr = ipath->fspath->val[i] -
3843 (u64)(unsigned long)ipath->fspath->val;
3844 ipath->fspath->val[i] = rel_ptr;
3847 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
3848 ipath->fspath, size);
3855 btrfs_free_path(path);
3862 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3864 struct btrfs_data_container *inodes = ctx;
3865 const size_t c = 3 * sizeof(u64);
3867 if (inodes->bytes_left >= c) {
3868 inodes->bytes_left -= c;
3869 inodes->val[inodes->elem_cnt] = inum;
3870 inodes->val[inodes->elem_cnt + 1] = offset;
3871 inodes->val[inodes->elem_cnt + 2] = root;
3872 inodes->elem_cnt += 3;
3874 inodes->bytes_missing += c - inodes->bytes_left;
3875 inodes->bytes_left = 0;
3876 inodes->elem_missed += 3;
3882 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
3883 void __user *arg, int version)
3887 struct btrfs_ioctl_logical_ino_args *loi;
3888 struct btrfs_data_container *inodes = NULL;
3889 struct btrfs_path *path = NULL;
3892 if (!capable(CAP_SYS_ADMIN))
3895 loi = memdup_user(arg, sizeof(*loi));
3897 return PTR_ERR(loi);
3900 ignore_offset = false;
3901 size = min_t(u32, loi->size, SZ_64K);
3903 /* All reserved bits must be 0 for now */
3904 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
3908 /* Only accept flags we have defined so far */
3909 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
3913 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
3914 size = min_t(u32, loi->size, SZ_16M);
3917 path = btrfs_alloc_path();
3923 inodes = init_data_container(size);
3924 if (IS_ERR(inodes)) {
3925 ret = PTR_ERR(inodes);
3930 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
3931 build_ino_list, inodes, ignore_offset);
3937 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
3943 btrfs_free_path(path);
3951 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3952 struct btrfs_ioctl_balance_args *bargs)
3954 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3956 bargs->flags = bctl->flags;
3958 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
3959 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3960 if (atomic_read(&fs_info->balance_pause_req))
3961 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3962 if (atomic_read(&fs_info->balance_cancel_req))
3963 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3965 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3966 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3967 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3969 spin_lock(&fs_info->balance_lock);
3970 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3971 spin_unlock(&fs_info->balance_lock);
3974 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3976 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3977 struct btrfs_fs_info *fs_info = root->fs_info;
3978 struct btrfs_ioctl_balance_args *bargs;
3979 struct btrfs_balance_control *bctl;
3980 bool need_unlock; /* for mut. excl. ops lock */
3985 "IOC_BALANCE ioctl (v1) is deprecated and will be removed in kernel 5.18");
3987 if (!capable(CAP_SYS_ADMIN))
3990 ret = mnt_want_write_file(file);
3995 if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
3996 mutex_lock(&fs_info->balance_mutex);
4002 * mut. excl. ops lock is locked. Three possibilities:
4003 * (1) some other op is running
4004 * (2) balance is running
4005 * (3) balance is paused -- special case (think resume)
4007 mutex_lock(&fs_info->balance_mutex);
4008 if (fs_info->balance_ctl) {
4009 /* this is either (2) or (3) */
4010 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4011 mutex_unlock(&fs_info->balance_mutex);
4013 * Lock released to allow other waiters to continue,
4014 * we'll reexamine the status again.
4016 mutex_lock(&fs_info->balance_mutex);
4018 if (fs_info->balance_ctl &&
4019 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4021 need_unlock = false;
4025 mutex_unlock(&fs_info->balance_mutex);
4029 mutex_unlock(&fs_info->balance_mutex);
4035 mutex_unlock(&fs_info->balance_mutex);
4036 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4043 bargs = memdup_user(arg, sizeof(*bargs));
4044 if (IS_ERR(bargs)) {
4045 ret = PTR_ERR(bargs);
4049 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4050 if (!fs_info->balance_ctl) {
4055 bctl = fs_info->balance_ctl;
4056 spin_lock(&fs_info->balance_lock);
4057 bctl->flags |= BTRFS_BALANCE_RESUME;
4058 spin_unlock(&fs_info->balance_lock);
4066 if (fs_info->balance_ctl) {
4071 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4078 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4079 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4080 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4082 bctl->flags = bargs->flags;
4084 /* balance everything - no filters */
4085 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4088 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4095 * Ownership of bctl and exclusive operation goes to btrfs_balance.
4096 * bctl is freed in reset_balance_state, or, if restriper was paused
4097 * all the way until unmount, in free_fs_info. The flag should be
4098 * cleared after reset_balance_state.
4100 need_unlock = false;
4102 ret = btrfs_balance(fs_info, bctl, bargs);
4105 if ((ret == 0 || ret == -ECANCELED) && arg) {
4106 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4115 mutex_unlock(&fs_info->balance_mutex);
4117 btrfs_exclop_finish(fs_info);
4119 mnt_drop_write_file(file);
4123 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
4125 if (!capable(CAP_SYS_ADMIN))
4129 case BTRFS_BALANCE_CTL_PAUSE:
4130 return btrfs_pause_balance(fs_info);
4131 case BTRFS_BALANCE_CTL_CANCEL:
4132 return btrfs_cancel_balance(fs_info);
4138 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
4141 struct btrfs_ioctl_balance_args *bargs;
4144 if (!capable(CAP_SYS_ADMIN))
4147 mutex_lock(&fs_info->balance_mutex);
4148 if (!fs_info->balance_ctl) {
4153 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4159 btrfs_update_ioctl_balance_args(fs_info, bargs);
4161 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4166 mutex_unlock(&fs_info->balance_mutex);
4170 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4172 struct inode *inode = file_inode(file);
4173 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4174 struct btrfs_ioctl_quota_ctl_args *sa;
4177 if (!capable(CAP_SYS_ADMIN))
4180 ret = mnt_want_write_file(file);
4184 sa = memdup_user(arg, sizeof(*sa));
4190 down_write(&fs_info->subvol_sem);
4193 case BTRFS_QUOTA_CTL_ENABLE:
4194 ret = btrfs_quota_enable(fs_info);
4196 case BTRFS_QUOTA_CTL_DISABLE:
4197 ret = btrfs_quota_disable(fs_info);
4205 up_write(&fs_info->subvol_sem);
4207 mnt_drop_write_file(file);
4211 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4213 struct inode *inode = file_inode(file);
4214 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4215 struct btrfs_root *root = BTRFS_I(inode)->root;
4216 struct btrfs_ioctl_qgroup_assign_args *sa;
4217 struct btrfs_trans_handle *trans;
4221 if (!capable(CAP_SYS_ADMIN))
4224 ret = mnt_want_write_file(file);
4228 sa = memdup_user(arg, sizeof(*sa));
4234 trans = btrfs_join_transaction(root);
4235 if (IS_ERR(trans)) {
4236 ret = PTR_ERR(trans);
4241 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
4243 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
4246 /* update qgroup status and info */
4247 err = btrfs_run_qgroups(trans);
4249 btrfs_handle_fs_error(fs_info, err,
4250 "failed to update qgroup status and info");
4251 err = btrfs_end_transaction(trans);
4258 mnt_drop_write_file(file);
4262 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4264 struct inode *inode = file_inode(file);
4265 struct btrfs_root *root = BTRFS_I(inode)->root;
4266 struct btrfs_ioctl_qgroup_create_args *sa;
4267 struct btrfs_trans_handle *trans;
4271 if (!capable(CAP_SYS_ADMIN))
4274 ret = mnt_want_write_file(file);
4278 sa = memdup_user(arg, sizeof(*sa));
4284 if (!sa->qgroupid) {
4289 trans = btrfs_join_transaction(root);
4290 if (IS_ERR(trans)) {
4291 ret = PTR_ERR(trans);
4296 ret = btrfs_create_qgroup(trans, sa->qgroupid);
4298 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
4301 err = btrfs_end_transaction(trans);
4308 mnt_drop_write_file(file);
4312 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4314 struct inode *inode = file_inode(file);
4315 struct btrfs_root *root = BTRFS_I(inode)->root;
4316 struct btrfs_ioctl_qgroup_limit_args *sa;
4317 struct btrfs_trans_handle *trans;
4322 if (!capable(CAP_SYS_ADMIN))
4325 ret = mnt_want_write_file(file);
4329 sa = memdup_user(arg, sizeof(*sa));
4335 trans = btrfs_join_transaction(root);
4336 if (IS_ERR(trans)) {
4337 ret = PTR_ERR(trans);
4341 qgroupid = sa->qgroupid;
4343 /* take the current subvol as qgroup */
4344 qgroupid = root->root_key.objectid;
4347 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
4349 err = btrfs_end_transaction(trans);
4356 mnt_drop_write_file(file);
4360 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4362 struct inode *inode = file_inode(file);
4363 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4364 struct btrfs_ioctl_quota_rescan_args *qsa;
4367 if (!capable(CAP_SYS_ADMIN))
4370 ret = mnt_want_write_file(file);
4374 qsa = memdup_user(arg, sizeof(*qsa));
4385 ret = btrfs_qgroup_rescan(fs_info);
4390 mnt_drop_write_file(file);
4394 static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
4397 struct btrfs_ioctl_quota_rescan_args qsa = {0};
4399 if (!capable(CAP_SYS_ADMIN))
4402 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4404 qsa.progress = fs_info->qgroup_rescan_progress.objectid;
4407 if (copy_to_user(arg, &qsa, sizeof(qsa)))
4413 static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
4416 if (!capable(CAP_SYS_ADMIN))
4419 return btrfs_qgroup_wait_for_completion(fs_info, true);
4422 static long _btrfs_ioctl_set_received_subvol(struct file *file,
4423 struct user_namespace *mnt_userns,
4424 struct btrfs_ioctl_received_subvol_args *sa)
4426 struct inode *inode = file_inode(file);
4427 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4428 struct btrfs_root *root = BTRFS_I(inode)->root;
4429 struct btrfs_root_item *root_item = &root->root_item;
4430 struct btrfs_trans_handle *trans;
4431 struct timespec64 ct = current_time(inode);
4433 int received_uuid_changed;
4435 if (!inode_owner_or_capable(mnt_userns, inode))
4438 ret = mnt_want_write_file(file);
4442 down_write(&fs_info->subvol_sem);
4444 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
4449 if (btrfs_root_readonly(root)) {
4456 * 2 - uuid items (received uuid + subvol uuid)
4458 trans = btrfs_start_transaction(root, 3);
4459 if (IS_ERR(trans)) {
4460 ret = PTR_ERR(trans);
4465 sa->rtransid = trans->transid;
4466 sa->rtime.sec = ct.tv_sec;
4467 sa->rtime.nsec = ct.tv_nsec;
4469 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4471 if (received_uuid_changed &&
4472 !btrfs_is_empty_uuid(root_item->received_uuid)) {
4473 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
4474 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4475 root->root_key.objectid);
4476 if (ret && ret != -ENOENT) {
4477 btrfs_abort_transaction(trans, ret);
4478 btrfs_end_transaction(trans);
4482 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4483 btrfs_set_root_stransid(root_item, sa->stransid);
4484 btrfs_set_root_rtransid(root_item, sa->rtransid);
4485 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4486 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4487 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4488 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4490 ret = btrfs_update_root(trans, fs_info->tree_root,
4491 &root->root_key, &root->root_item);
4493 btrfs_end_transaction(trans);
4496 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4497 ret = btrfs_uuid_tree_add(trans, sa->uuid,
4498 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4499 root->root_key.objectid);
4500 if (ret < 0 && ret != -EEXIST) {
4501 btrfs_abort_transaction(trans, ret);
4502 btrfs_end_transaction(trans);
4506 ret = btrfs_commit_transaction(trans);
4508 up_write(&fs_info->subvol_sem);
4509 mnt_drop_write_file(file);
4514 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4517 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4518 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4521 args32 = memdup_user(arg, sizeof(*args32));
4523 return PTR_ERR(args32);
4525 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
4531 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4532 args64->stransid = args32->stransid;
4533 args64->rtransid = args32->rtransid;
4534 args64->stime.sec = args32->stime.sec;
4535 args64->stime.nsec = args32->stime.nsec;
4536 args64->rtime.sec = args32->rtime.sec;
4537 args64->rtime.nsec = args32->rtime.nsec;
4538 args64->flags = args32->flags;
4540 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), args64);
4544 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4545 args32->stransid = args64->stransid;
4546 args32->rtransid = args64->rtransid;
4547 args32->stime.sec = args64->stime.sec;
4548 args32->stime.nsec = args64->stime.nsec;
4549 args32->rtime.sec = args64->rtime.sec;
4550 args32->rtime.nsec = args64->rtime.nsec;
4551 args32->flags = args64->flags;
4553 ret = copy_to_user(arg, args32, sizeof(*args32));
4564 static long btrfs_ioctl_set_received_subvol(struct file *file,
4567 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4570 sa = memdup_user(arg, sizeof(*sa));
4574 ret = _btrfs_ioctl_set_received_subvol(file, file_mnt_user_ns(file), sa);
4579 ret = copy_to_user(arg, sa, sizeof(*sa));
4588 static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
4593 char label[BTRFS_LABEL_SIZE];
4595 spin_lock(&fs_info->super_lock);
4596 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4597 spin_unlock(&fs_info->super_lock);
4599 len = strnlen(label, BTRFS_LABEL_SIZE);
4601 if (len == BTRFS_LABEL_SIZE) {
4603 "label is too long, return the first %zu bytes",
4607 ret = copy_to_user(arg, label, len);
4609 return ret ? -EFAULT : 0;
4612 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4614 struct inode *inode = file_inode(file);
4615 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4616 struct btrfs_root *root = BTRFS_I(inode)->root;
4617 struct btrfs_super_block *super_block = fs_info->super_copy;
4618 struct btrfs_trans_handle *trans;
4619 char label[BTRFS_LABEL_SIZE];
4622 if (!capable(CAP_SYS_ADMIN))
4625 if (copy_from_user(label, arg, sizeof(label)))
4628 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4630 "unable to set label with more than %d bytes",
4631 BTRFS_LABEL_SIZE - 1);
4635 ret = mnt_want_write_file(file);
4639 trans = btrfs_start_transaction(root, 0);
4640 if (IS_ERR(trans)) {
4641 ret = PTR_ERR(trans);
4645 spin_lock(&fs_info->super_lock);
4646 strcpy(super_block->label, label);
4647 spin_unlock(&fs_info->super_lock);
4648 ret = btrfs_commit_transaction(trans);
4651 mnt_drop_write_file(file);
4655 #define INIT_FEATURE_FLAGS(suffix) \
4656 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4657 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4658 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4660 int btrfs_ioctl_get_supported_features(void __user *arg)
4662 static const struct btrfs_ioctl_feature_flags features[3] = {
4663 INIT_FEATURE_FLAGS(SUPP),
4664 INIT_FEATURE_FLAGS(SAFE_SET),
4665 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4668 if (copy_to_user(arg, &features, sizeof(features)))
4674 static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
4677 struct btrfs_super_block *super_block = fs_info->super_copy;
4678 struct btrfs_ioctl_feature_flags features;
4680 features.compat_flags = btrfs_super_compat_flags(super_block);
4681 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4682 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4684 if (copy_to_user(arg, &features, sizeof(features)))
4690 static int check_feature_bits(struct btrfs_fs_info *fs_info,
4691 enum btrfs_feature_set set,
4692 u64 change_mask, u64 flags, u64 supported_flags,
4693 u64 safe_set, u64 safe_clear)
4695 const char *type = btrfs_feature_set_name(set);
4697 u64 disallowed, unsupported;
4698 u64 set_mask = flags & change_mask;
4699 u64 clear_mask = ~flags & change_mask;
4701 unsupported = set_mask & ~supported_flags;
4703 names = btrfs_printable_features(set, unsupported);
4706 "this kernel does not support the %s feature bit%s",
4707 names, strchr(names, ',') ? "s" : "");
4711 "this kernel does not support %s bits 0x%llx",
4716 disallowed = set_mask & ~safe_set;
4718 names = btrfs_printable_features(set, disallowed);
4721 "can't set the %s feature bit%s while mounted",
4722 names, strchr(names, ',') ? "s" : "");
4726 "can't set %s bits 0x%llx while mounted",
4731 disallowed = clear_mask & ~safe_clear;
4733 names = btrfs_printable_features(set, disallowed);
4736 "can't clear the %s feature bit%s while mounted",
4737 names, strchr(names, ',') ? "s" : "");
4741 "can't clear %s bits 0x%llx while mounted",
4749 #define check_feature(fs_info, change_mask, flags, mask_base) \
4750 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
4751 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4752 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4753 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4755 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4757 struct inode *inode = file_inode(file);
4758 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4759 struct btrfs_root *root = BTRFS_I(inode)->root;
4760 struct btrfs_super_block *super_block = fs_info->super_copy;
4761 struct btrfs_ioctl_feature_flags flags[2];
4762 struct btrfs_trans_handle *trans;
4766 if (!capable(CAP_SYS_ADMIN))
4769 if (copy_from_user(flags, arg, sizeof(flags)))
4773 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4774 !flags[0].incompat_flags)
4777 ret = check_feature(fs_info, flags[0].compat_flags,
4778 flags[1].compat_flags, COMPAT);
4782 ret = check_feature(fs_info, flags[0].compat_ro_flags,
4783 flags[1].compat_ro_flags, COMPAT_RO);
4787 ret = check_feature(fs_info, flags[0].incompat_flags,
4788 flags[1].incompat_flags, INCOMPAT);
4792 ret = mnt_want_write_file(file);
4796 trans = btrfs_start_transaction(root, 0);
4797 if (IS_ERR(trans)) {
4798 ret = PTR_ERR(trans);
4799 goto out_drop_write;
4802 spin_lock(&fs_info->super_lock);
4803 newflags = btrfs_super_compat_flags(super_block);
4804 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4805 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4806 btrfs_set_super_compat_flags(super_block, newflags);
4808 newflags = btrfs_super_compat_ro_flags(super_block);
4809 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4810 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4811 btrfs_set_super_compat_ro_flags(super_block, newflags);
4813 newflags = btrfs_super_incompat_flags(super_block);
4814 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4815 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4816 btrfs_set_super_incompat_flags(super_block, newflags);
4817 spin_unlock(&fs_info->super_lock);
4819 ret = btrfs_commit_transaction(trans);
4821 mnt_drop_write_file(file);
4826 static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
4828 struct btrfs_ioctl_send_args *arg;
4832 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4833 struct btrfs_ioctl_send_args_32 args32;
4835 ret = copy_from_user(&args32, argp, sizeof(args32));
4838 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
4841 arg->send_fd = args32.send_fd;
4842 arg->clone_sources_count = args32.clone_sources_count;
4843 arg->clone_sources = compat_ptr(args32.clone_sources);
4844 arg->parent_root = args32.parent_root;
4845 arg->flags = args32.flags;
4846 memcpy(arg->reserved, args32.reserved,
4847 sizeof(args32.reserved));
4852 arg = memdup_user(argp, sizeof(*arg));
4854 return PTR_ERR(arg);
4856 ret = btrfs_ioctl_send(file, arg);
4861 long btrfs_ioctl(struct file *file, unsigned int
4862 cmd, unsigned long arg)
4864 struct inode *inode = file_inode(file);
4865 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4866 struct btrfs_root *root = BTRFS_I(inode)->root;
4867 void __user *argp = (void __user *)arg;
4870 case FS_IOC_GETVERSION:
4871 return btrfs_ioctl_getversion(file, argp);
4872 case FS_IOC_GETFSLABEL:
4873 return btrfs_ioctl_get_fslabel(fs_info, argp);
4874 case FS_IOC_SETFSLABEL:
4875 return btrfs_ioctl_set_fslabel(file, argp);
4877 return btrfs_ioctl_fitrim(fs_info, argp);
4878 case BTRFS_IOC_SNAP_CREATE:
4879 return btrfs_ioctl_snap_create(file, argp, 0);
4880 case BTRFS_IOC_SNAP_CREATE_V2:
4881 return btrfs_ioctl_snap_create_v2(file, argp, 0);
4882 case BTRFS_IOC_SUBVOL_CREATE:
4883 return btrfs_ioctl_snap_create(file, argp, 1);
4884 case BTRFS_IOC_SUBVOL_CREATE_V2:
4885 return btrfs_ioctl_snap_create_v2(file, argp, 1);
4886 case BTRFS_IOC_SNAP_DESTROY:
4887 return btrfs_ioctl_snap_destroy(file, argp, false);
4888 case BTRFS_IOC_SNAP_DESTROY_V2:
4889 return btrfs_ioctl_snap_destroy(file, argp, true);
4890 case BTRFS_IOC_SUBVOL_GETFLAGS:
4891 return btrfs_ioctl_subvol_getflags(file, argp);
4892 case BTRFS_IOC_SUBVOL_SETFLAGS:
4893 return btrfs_ioctl_subvol_setflags(file, argp);
4894 case BTRFS_IOC_DEFAULT_SUBVOL:
4895 return btrfs_ioctl_default_subvol(file, argp);
4896 case BTRFS_IOC_DEFRAG:
4897 return btrfs_ioctl_defrag(file, NULL);
4898 case BTRFS_IOC_DEFRAG_RANGE:
4899 return btrfs_ioctl_defrag(file, argp);
4900 case BTRFS_IOC_RESIZE:
4901 return btrfs_ioctl_resize(file, argp);
4902 case BTRFS_IOC_ADD_DEV:
4903 return btrfs_ioctl_add_dev(fs_info, argp);
4904 case BTRFS_IOC_RM_DEV:
4905 return btrfs_ioctl_rm_dev(file, argp);
4906 case BTRFS_IOC_RM_DEV_V2:
4907 return btrfs_ioctl_rm_dev_v2(file, argp);
4908 case BTRFS_IOC_FS_INFO:
4909 return btrfs_ioctl_fs_info(fs_info, argp);
4910 case BTRFS_IOC_DEV_INFO:
4911 return btrfs_ioctl_dev_info(fs_info, argp);
4912 case BTRFS_IOC_BALANCE:
4913 return btrfs_ioctl_balance(file, NULL);
4914 case BTRFS_IOC_TREE_SEARCH:
4915 return btrfs_ioctl_tree_search(file, argp);
4916 case BTRFS_IOC_TREE_SEARCH_V2:
4917 return btrfs_ioctl_tree_search_v2(file, argp);
4918 case BTRFS_IOC_INO_LOOKUP:
4919 return btrfs_ioctl_ino_lookup(file, argp);
4920 case BTRFS_IOC_INO_PATHS:
4921 return btrfs_ioctl_ino_to_path(root, argp);
4922 case BTRFS_IOC_LOGICAL_INO:
4923 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
4924 case BTRFS_IOC_LOGICAL_INO_V2:
4925 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
4926 case BTRFS_IOC_SPACE_INFO:
4927 return btrfs_ioctl_space_info(fs_info, argp);
4928 case BTRFS_IOC_SYNC: {
4931 ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
4934 ret = btrfs_sync_fs(inode->i_sb, 1);
4936 * The transaction thread may want to do more work,
4937 * namely it pokes the cleaner kthread that will start
4938 * processing uncleaned subvols.
4940 wake_up_process(fs_info->transaction_kthread);
4943 case BTRFS_IOC_START_SYNC:
4944 return btrfs_ioctl_start_sync(root, argp);
4945 case BTRFS_IOC_WAIT_SYNC:
4946 return btrfs_ioctl_wait_sync(fs_info, argp);
4947 case BTRFS_IOC_SCRUB:
4948 return btrfs_ioctl_scrub(file, argp);
4949 case BTRFS_IOC_SCRUB_CANCEL:
4950 return btrfs_ioctl_scrub_cancel(fs_info);
4951 case BTRFS_IOC_SCRUB_PROGRESS:
4952 return btrfs_ioctl_scrub_progress(fs_info, argp);
4953 case BTRFS_IOC_BALANCE_V2:
4954 return btrfs_ioctl_balance(file, argp);
4955 case BTRFS_IOC_BALANCE_CTL:
4956 return btrfs_ioctl_balance_ctl(fs_info, arg);
4957 case BTRFS_IOC_BALANCE_PROGRESS:
4958 return btrfs_ioctl_balance_progress(fs_info, argp);
4959 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4960 return btrfs_ioctl_set_received_subvol(file, argp);
4962 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
4963 return btrfs_ioctl_set_received_subvol_32(file, argp);
4965 case BTRFS_IOC_SEND:
4966 return _btrfs_ioctl_send(file, argp, false);
4967 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4968 case BTRFS_IOC_SEND_32:
4969 return _btrfs_ioctl_send(file, argp, true);
4971 case BTRFS_IOC_GET_DEV_STATS:
4972 return btrfs_ioctl_get_dev_stats(fs_info, argp);
4973 case BTRFS_IOC_QUOTA_CTL:
4974 return btrfs_ioctl_quota_ctl(file, argp);
4975 case BTRFS_IOC_QGROUP_ASSIGN:
4976 return btrfs_ioctl_qgroup_assign(file, argp);
4977 case BTRFS_IOC_QGROUP_CREATE:
4978 return btrfs_ioctl_qgroup_create(file, argp);
4979 case BTRFS_IOC_QGROUP_LIMIT:
4980 return btrfs_ioctl_qgroup_limit(file, argp);
4981 case BTRFS_IOC_QUOTA_RESCAN:
4982 return btrfs_ioctl_quota_rescan(file, argp);
4983 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4984 return btrfs_ioctl_quota_rescan_status(fs_info, argp);
4985 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4986 return btrfs_ioctl_quota_rescan_wait(fs_info, argp);
4987 case BTRFS_IOC_DEV_REPLACE:
4988 return btrfs_ioctl_dev_replace(fs_info, argp);
4989 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4990 return btrfs_ioctl_get_supported_features(argp);
4991 case BTRFS_IOC_GET_FEATURES:
4992 return btrfs_ioctl_get_features(fs_info, argp);
4993 case BTRFS_IOC_SET_FEATURES:
4994 return btrfs_ioctl_set_features(file, argp);
4995 case BTRFS_IOC_GET_SUBVOL_INFO:
4996 return btrfs_ioctl_get_subvol_info(file, argp);
4997 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
4998 return btrfs_ioctl_get_subvol_rootref(file, argp);
4999 case BTRFS_IOC_INO_LOOKUP_USER:
5000 return btrfs_ioctl_ino_lookup_user(file, argp);
5001 case FS_IOC_ENABLE_VERITY:
5002 return fsverity_ioctl_enable(file, (const void __user *)argp);
5003 case FS_IOC_MEASURE_VERITY:
5004 return fsverity_ioctl_measure(file, argp);
5010 #ifdef CONFIG_COMPAT
5011 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5014 * These all access 32-bit values anyway so no further
5015 * handling is necessary.
5018 case FS_IOC32_GETVERSION:
5019 cmd = FS_IOC_GETVERSION;
5023 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));