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>
31 #include "transaction.h"
32 #include "btrfs_inode.h"
33 #include "print-tree.h"
36 #include "inode-map.h"
38 #include "rcu-string.h"
40 #include "dev-replace.h"
45 #include "compression.h"
48 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
49 * structures are incorrect, as the timespec structure from userspace
50 * is 4 bytes too small. We define these alternatives here to teach
51 * the kernel about the 32-bit struct packing.
53 struct btrfs_ioctl_timespec_32 {
56 } __attribute__ ((__packed__));
58 struct btrfs_ioctl_received_subvol_args_32 {
59 char uuid[BTRFS_UUID_SIZE]; /* in */
60 __u64 stransid; /* in */
61 __u64 rtransid; /* out */
62 struct btrfs_ioctl_timespec_32 stime; /* in */
63 struct btrfs_ioctl_timespec_32 rtime; /* out */
65 __u64 reserved[16]; /* in */
66 } __attribute__ ((__packed__));
68 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
69 struct btrfs_ioctl_received_subvol_args_32)
72 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
73 struct btrfs_ioctl_send_args_32 {
74 __s64 send_fd; /* in */
75 __u64 clone_sources_count; /* in */
76 compat_uptr_t clone_sources; /* in */
77 __u64 parent_root; /* in */
79 __u64 reserved[4]; /* in */
80 } __attribute__ ((__packed__));
82 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
83 struct btrfs_ioctl_send_args_32)
86 static int btrfs_clone(struct inode *src, struct inode *inode,
87 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
90 /* Mask out flags that are inappropriate for the given type of inode. */
91 static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
94 if (S_ISDIR(inode->i_mode))
96 else if (S_ISREG(inode->i_mode))
97 return flags & ~FS_DIRSYNC_FL;
99 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
103 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
106 static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
108 unsigned int iflags = 0;
110 if (flags & BTRFS_INODE_SYNC)
111 iflags |= FS_SYNC_FL;
112 if (flags & BTRFS_INODE_IMMUTABLE)
113 iflags |= FS_IMMUTABLE_FL;
114 if (flags & BTRFS_INODE_APPEND)
115 iflags |= FS_APPEND_FL;
116 if (flags & BTRFS_INODE_NODUMP)
117 iflags |= FS_NODUMP_FL;
118 if (flags & BTRFS_INODE_NOATIME)
119 iflags |= FS_NOATIME_FL;
120 if (flags & BTRFS_INODE_DIRSYNC)
121 iflags |= FS_DIRSYNC_FL;
122 if (flags & BTRFS_INODE_NODATACOW)
123 iflags |= FS_NOCOW_FL;
125 if (flags & BTRFS_INODE_NOCOMPRESS)
126 iflags |= FS_NOCOMP_FL;
127 else if (flags & BTRFS_INODE_COMPRESS)
128 iflags |= FS_COMPR_FL;
134 * Update inode->i_flags based on the btrfs internal flags.
136 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
138 struct btrfs_inode *binode = BTRFS_I(inode);
139 unsigned int new_fl = 0;
141 if (binode->flags & BTRFS_INODE_SYNC)
143 if (binode->flags & BTRFS_INODE_IMMUTABLE)
144 new_fl |= S_IMMUTABLE;
145 if (binode->flags & BTRFS_INODE_APPEND)
147 if (binode->flags & BTRFS_INODE_NOATIME)
149 if (binode->flags & BTRFS_INODE_DIRSYNC)
152 set_mask_bits(&inode->i_flags,
153 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
157 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
159 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
160 unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
162 if (copy_to_user(arg, &flags, sizeof(flags)))
167 /* Check if @flags are a supported and valid set of FS_*_FL flags */
168 static int check_fsflags(unsigned int flags)
170 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
171 FS_NOATIME_FL | FS_NODUMP_FL | \
172 FS_SYNC_FL | FS_DIRSYNC_FL | \
173 FS_NOCOMP_FL | FS_COMPR_FL |
177 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
183 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
185 struct inode *inode = file_inode(file);
186 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
187 struct btrfs_inode *binode = BTRFS_I(inode);
188 struct btrfs_root *root = binode->root;
189 struct btrfs_trans_handle *trans;
190 unsigned int fsflags, old_fsflags;
193 unsigned int old_i_flags;
196 if (!inode_owner_or_capable(inode))
199 if (btrfs_root_readonly(root))
202 if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
205 ret = check_fsflags(fsflags);
209 ret = mnt_want_write_file(file);
215 old_flags = binode->flags;
216 old_i_flags = inode->i_flags;
217 mode = inode->i_mode;
219 fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
220 old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
221 if ((fsflags ^ old_fsflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
222 if (!capable(CAP_LINUX_IMMUTABLE)) {
228 if (fsflags & FS_SYNC_FL)
229 binode->flags |= BTRFS_INODE_SYNC;
231 binode->flags &= ~BTRFS_INODE_SYNC;
232 if (fsflags & FS_IMMUTABLE_FL)
233 binode->flags |= BTRFS_INODE_IMMUTABLE;
235 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
236 if (fsflags & FS_APPEND_FL)
237 binode->flags |= BTRFS_INODE_APPEND;
239 binode->flags &= ~BTRFS_INODE_APPEND;
240 if (fsflags & FS_NODUMP_FL)
241 binode->flags |= BTRFS_INODE_NODUMP;
243 binode->flags &= ~BTRFS_INODE_NODUMP;
244 if (fsflags & FS_NOATIME_FL)
245 binode->flags |= BTRFS_INODE_NOATIME;
247 binode->flags &= ~BTRFS_INODE_NOATIME;
248 if (fsflags & FS_DIRSYNC_FL)
249 binode->flags |= BTRFS_INODE_DIRSYNC;
251 binode->flags &= ~BTRFS_INODE_DIRSYNC;
252 if (fsflags & FS_NOCOW_FL) {
255 * It's safe to turn csums off here, no extents exist.
256 * Otherwise we want the flag to reflect the real COW
257 * status of the file and will not set it.
259 if (inode->i_size == 0)
260 binode->flags |= BTRFS_INODE_NODATACOW
261 | BTRFS_INODE_NODATASUM;
263 binode->flags |= BTRFS_INODE_NODATACOW;
267 * Revert back under same assumptions as above
270 if (inode->i_size == 0)
271 binode->flags &= ~(BTRFS_INODE_NODATACOW
272 | BTRFS_INODE_NODATASUM);
274 binode->flags &= ~BTRFS_INODE_NODATACOW;
279 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
280 * flag may be changed automatically if compression code won't make
283 if (fsflags & FS_NOCOMP_FL) {
284 binode->flags &= ~BTRFS_INODE_COMPRESS;
285 binode->flags |= BTRFS_INODE_NOCOMPRESS;
287 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
288 if (ret && ret != -ENODATA)
290 } else if (fsflags & FS_COMPR_FL) {
293 binode->flags |= BTRFS_INODE_COMPRESS;
294 binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
296 comp = btrfs_compress_type2str(fs_info->compress_type);
297 if (!comp || comp[0] == 0)
298 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
300 ret = btrfs_set_prop(inode, "btrfs.compression",
301 comp, strlen(comp), 0);
306 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
307 if (ret && ret != -ENODATA)
309 binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
312 trans = btrfs_start_transaction(root, 1);
314 ret = PTR_ERR(trans);
318 btrfs_sync_inode_flags_to_i_flags(inode);
319 inode_inc_iversion(inode);
320 inode->i_ctime = current_time(inode);
321 ret = btrfs_update_inode(trans, root, inode);
323 btrfs_end_transaction(trans);
326 binode->flags = old_flags;
327 inode->i_flags = old_i_flags;
332 mnt_drop_write_file(file);
337 * Translate btrfs internal inode flags to xflags as expected by the
338 * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
341 static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
343 unsigned int xflags = 0;
345 if (flags & BTRFS_INODE_APPEND)
346 xflags |= FS_XFLAG_APPEND;
347 if (flags & BTRFS_INODE_IMMUTABLE)
348 xflags |= FS_XFLAG_IMMUTABLE;
349 if (flags & BTRFS_INODE_NOATIME)
350 xflags |= FS_XFLAG_NOATIME;
351 if (flags & BTRFS_INODE_NODUMP)
352 xflags |= FS_XFLAG_NODUMP;
353 if (flags & BTRFS_INODE_SYNC)
354 xflags |= FS_XFLAG_SYNC;
359 /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
360 static int check_xflags(unsigned int flags)
362 if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
363 FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
369 * Set the xflags from the internal inode flags. The remaining items of fsxattr
372 static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
374 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
377 memset(&fa, 0, sizeof(fa));
378 fa.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
380 if (copy_to_user(arg, &fa, sizeof(fa)))
386 static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
388 struct inode *inode = file_inode(file);
389 struct btrfs_inode *binode = BTRFS_I(inode);
390 struct btrfs_root *root = binode->root;
391 struct btrfs_trans_handle *trans;
394 unsigned old_i_flags;
397 if (!inode_owner_or_capable(inode))
400 if (btrfs_root_readonly(root))
403 memset(&fa, 0, sizeof(fa));
404 if (copy_from_user(&fa, arg, sizeof(fa)))
407 ret = check_xflags(fa.fsx_xflags);
411 if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
414 ret = mnt_want_write_file(file);
420 old_flags = binode->flags;
421 old_i_flags = inode->i_flags;
423 /* We need the capabilities to change append-only or immutable inode */
424 if (((old_flags & (BTRFS_INODE_APPEND | BTRFS_INODE_IMMUTABLE)) ||
425 (fa.fsx_xflags & (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE))) &&
426 !capable(CAP_LINUX_IMMUTABLE)) {
431 if (fa.fsx_xflags & FS_XFLAG_SYNC)
432 binode->flags |= BTRFS_INODE_SYNC;
434 binode->flags &= ~BTRFS_INODE_SYNC;
435 if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
436 binode->flags |= BTRFS_INODE_IMMUTABLE;
438 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
439 if (fa.fsx_xflags & FS_XFLAG_APPEND)
440 binode->flags |= BTRFS_INODE_APPEND;
442 binode->flags &= ~BTRFS_INODE_APPEND;
443 if (fa.fsx_xflags & FS_XFLAG_NODUMP)
444 binode->flags |= BTRFS_INODE_NODUMP;
446 binode->flags &= ~BTRFS_INODE_NODUMP;
447 if (fa.fsx_xflags & FS_XFLAG_NOATIME)
448 binode->flags |= BTRFS_INODE_NOATIME;
450 binode->flags &= ~BTRFS_INODE_NOATIME;
452 /* 1 item for the inode */
453 trans = btrfs_start_transaction(root, 1);
455 ret = PTR_ERR(trans);
459 btrfs_sync_inode_flags_to_i_flags(inode);
460 inode_inc_iversion(inode);
461 inode->i_ctime = current_time(inode);
462 ret = btrfs_update_inode(trans, root, inode);
464 btrfs_end_transaction(trans);
468 binode->flags = old_flags;
469 inode->i_flags = old_i_flags;
473 mnt_drop_write_file(file);
478 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
480 struct inode *inode = file_inode(file);
482 return put_user(inode->i_generation, arg);
485 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
487 struct inode *inode = file_inode(file);
488 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
489 struct btrfs_device *device;
490 struct request_queue *q;
491 struct fstrim_range range;
492 u64 minlen = ULLONG_MAX;
494 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
497 if (!capable(CAP_SYS_ADMIN))
501 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
505 q = bdev_get_queue(device->bdev);
506 if (blk_queue_discard(q)) {
508 minlen = min_t(u64, q->limits.discard_granularity,
516 if (copy_from_user(&range, arg, sizeof(range)))
518 if (range.start > total_bytes ||
519 range.len < fs_info->sb->s_blocksize)
522 range.len = min(range.len, total_bytes - range.start);
523 range.minlen = max(range.minlen, minlen);
524 ret = btrfs_trim_fs(fs_info, &range);
528 if (copy_to_user(arg, &range, sizeof(range)))
534 int btrfs_is_empty_uuid(u8 *uuid)
538 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
545 static noinline int create_subvol(struct inode *dir,
546 struct dentry *dentry,
547 const char *name, int namelen,
549 struct btrfs_qgroup_inherit *inherit)
551 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
552 struct btrfs_trans_handle *trans;
553 struct btrfs_key key;
554 struct btrfs_root_item *root_item;
555 struct btrfs_inode_item *inode_item;
556 struct extent_buffer *leaf;
557 struct btrfs_root *root = BTRFS_I(dir)->root;
558 struct btrfs_root *new_root;
559 struct btrfs_block_rsv block_rsv;
560 struct timespec64 cur_time = current_time(dir);
565 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
569 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
573 ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid);
578 * Don't create subvolume whose level is not zero. Or qgroup will be
579 * screwed up since it assumes subvolume qgroup's level to be 0.
581 if (btrfs_qgroup_level(objectid)) {
586 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
588 * The same as the snapshot creation, please see the comment
589 * of create_snapshot().
591 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
595 trans = btrfs_start_transaction(root, 0);
597 ret = PTR_ERR(trans);
598 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
601 trans->block_rsv = &block_rsv;
602 trans->bytes_reserved = block_rsv.size;
604 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
608 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
614 btrfs_mark_buffer_dirty(leaf);
616 inode_item = &root_item->inode;
617 btrfs_set_stack_inode_generation(inode_item, 1);
618 btrfs_set_stack_inode_size(inode_item, 3);
619 btrfs_set_stack_inode_nlink(inode_item, 1);
620 btrfs_set_stack_inode_nbytes(inode_item,
622 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
624 btrfs_set_root_flags(root_item, 0);
625 btrfs_set_root_limit(root_item, 0);
626 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
628 btrfs_set_root_bytenr(root_item, leaf->start);
629 btrfs_set_root_generation(root_item, trans->transid);
630 btrfs_set_root_level(root_item, 0);
631 btrfs_set_root_refs(root_item, 1);
632 btrfs_set_root_used(root_item, leaf->len);
633 btrfs_set_root_last_snapshot(root_item, 0);
635 btrfs_set_root_generation_v2(root_item,
636 btrfs_root_generation(root_item));
637 uuid_le_gen(&new_uuid);
638 memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
639 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
640 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
641 root_item->ctime = root_item->otime;
642 btrfs_set_root_ctransid(root_item, trans->transid);
643 btrfs_set_root_otransid(root_item, trans->transid);
645 btrfs_tree_unlock(leaf);
646 free_extent_buffer(leaf);
649 btrfs_set_root_dirid(root_item, new_dirid);
651 key.objectid = objectid;
653 key.type = BTRFS_ROOT_ITEM_KEY;
654 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
659 key.offset = (u64)-1;
660 new_root = btrfs_read_fs_root_no_name(fs_info, &key);
661 if (IS_ERR(new_root)) {
662 ret = PTR_ERR(new_root);
663 btrfs_abort_transaction(trans, ret);
667 btrfs_record_root_in_trans(trans, new_root);
669 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
671 /* We potentially lose an unused inode item here */
672 btrfs_abort_transaction(trans, ret);
676 mutex_lock(&new_root->objectid_mutex);
677 new_root->highest_objectid = new_dirid;
678 mutex_unlock(&new_root->objectid_mutex);
681 * insert the directory item
683 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
685 btrfs_abort_transaction(trans, ret);
689 ret = btrfs_insert_dir_item(trans, root,
690 name, namelen, BTRFS_I(dir), &key,
691 BTRFS_FT_DIR, index);
693 btrfs_abort_transaction(trans, ret);
697 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
698 ret = btrfs_update_inode(trans, root, dir);
701 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
702 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
705 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
706 BTRFS_UUID_KEY_SUBVOL, objectid);
708 btrfs_abort_transaction(trans, ret);
712 trans->block_rsv = NULL;
713 trans->bytes_reserved = 0;
714 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
717 *async_transid = trans->transid;
718 err = btrfs_commit_transaction_async(trans, 1);
720 err = btrfs_commit_transaction(trans);
722 err = btrfs_commit_transaction(trans);
728 inode = btrfs_lookup_dentry(dir, dentry);
730 return PTR_ERR(inode);
731 d_instantiate(dentry, inode);
740 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
741 struct dentry *dentry,
742 u64 *async_transid, bool readonly,
743 struct btrfs_qgroup_inherit *inherit)
745 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
747 struct btrfs_pending_snapshot *pending_snapshot;
748 struct btrfs_trans_handle *trans;
751 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
754 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
755 if (!pending_snapshot)
758 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
760 pending_snapshot->path = btrfs_alloc_path();
761 if (!pending_snapshot->root_item || !pending_snapshot->path) {
766 atomic_inc(&root->will_be_snapshotted);
767 smp_mb__after_atomic();
768 /* wait for no snapshot writes */
769 wait_event(root->subv_writers->wait,
770 percpu_counter_sum(&root->subv_writers->counter) == 0);
772 ret = btrfs_start_delalloc_inodes(root);
776 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
778 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
779 BTRFS_BLOCK_RSV_TEMP);
781 * 1 - parent dir inode
784 * 2 - root ref/backref
785 * 1 - root of snapshot
788 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
789 &pending_snapshot->block_rsv, 8,
794 pending_snapshot->dentry = dentry;
795 pending_snapshot->root = root;
796 pending_snapshot->readonly = readonly;
797 pending_snapshot->dir = dir;
798 pending_snapshot->inherit = inherit;
800 trans = btrfs_start_transaction(root, 0);
802 ret = PTR_ERR(trans);
806 spin_lock(&fs_info->trans_lock);
807 list_add(&pending_snapshot->list,
808 &trans->transaction->pending_snapshots);
809 spin_unlock(&fs_info->trans_lock);
811 *async_transid = trans->transid;
812 ret = btrfs_commit_transaction_async(trans, 1);
814 ret = btrfs_commit_transaction(trans);
816 ret = btrfs_commit_transaction(trans);
821 ret = pending_snapshot->error;
825 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
829 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
831 ret = PTR_ERR(inode);
835 d_instantiate(dentry, inode);
838 btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
840 if (atomic_dec_and_test(&root->will_be_snapshotted))
841 wake_up_var(&root->will_be_snapshotted);
843 kfree(pending_snapshot->root_item);
844 btrfs_free_path(pending_snapshot->path);
845 kfree(pending_snapshot);
850 /* copy of may_delete in fs/namei.c()
851 * Check whether we can remove a link victim from directory dir, check
852 * whether the type of victim is right.
853 * 1. We can't do it if dir is read-only (done in permission())
854 * 2. We should have write and exec permissions on dir
855 * 3. We can't remove anything from append-only dir
856 * 4. We can't do anything with immutable dir (done in permission())
857 * 5. If the sticky bit on dir is set we should either
858 * a. be owner of dir, or
859 * b. be owner of victim, or
860 * c. have CAP_FOWNER capability
861 * 6. If the victim is append-only or immutable we can't do anything with
862 * links pointing to it.
863 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
864 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
865 * 9. We can't remove a root or mountpoint.
866 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
867 * nfs_async_unlink().
870 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
874 if (d_really_is_negative(victim))
877 BUG_ON(d_inode(victim->d_parent) != dir);
878 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
880 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
885 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
886 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
889 if (!d_is_dir(victim))
893 } else if (d_is_dir(victim))
897 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
902 /* copy of may_create in fs/namei.c() */
903 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
905 if (d_really_is_positive(child))
909 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
913 * Create a new subvolume below @parent. This is largely modeled after
914 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
915 * inside this filesystem so it's quite a bit simpler.
917 static noinline int btrfs_mksubvol(const struct path *parent,
918 const char *name, int namelen,
919 struct btrfs_root *snap_src,
920 u64 *async_transid, bool readonly,
921 struct btrfs_qgroup_inherit *inherit)
923 struct inode *dir = d_inode(parent->dentry);
924 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
925 struct dentry *dentry;
928 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
932 dentry = lookup_one_len(name, parent->dentry, namelen);
933 error = PTR_ERR(dentry);
937 error = btrfs_may_create(dir, dentry);
942 * even if this name doesn't exist, we may get hash collisions.
943 * check for them now when we can safely fail
945 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
951 down_read(&fs_info->subvol_sem);
953 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
957 error = create_snapshot(snap_src, dir, dentry,
958 async_transid, readonly, inherit);
960 error = create_subvol(dir, dentry, name, namelen,
961 async_transid, inherit);
964 fsnotify_mkdir(dir, dentry);
966 up_read(&fs_info->subvol_sem);
975 * When we're defragging a range, we don't want to kick it off again
976 * if it is really just waiting for delalloc to send it down.
977 * If we find a nice big extent or delalloc range for the bytes in the
978 * file you want to defrag, we return 0 to let you know to skip this
981 static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
983 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
984 struct extent_map *em = NULL;
985 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
988 read_lock(&em_tree->lock);
989 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
990 read_unlock(&em_tree->lock);
993 end = extent_map_end(em);
995 if (end - offset > thresh)
998 /* if we already have a nice delalloc here, just stop */
1000 end = count_range_bits(io_tree, &offset, offset + thresh,
1001 thresh, EXTENT_DELALLOC, 1);
1008 * helper function to walk through a file and find extents
1009 * newer than a specific transid, and smaller than thresh.
1011 * This is used by the defragging code to find new and small
1014 static int find_new_extents(struct btrfs_root *root,
1015 struct inode *inode, u64 newer_than,
1016 u64 *off, u32 thresh)
1018 struct btrfs_path *path;
1019 struct btrfs_key min_key;
1020 struct extent_buffer *leaf;
1021 struct btrfs_file_extent_item *extent;
1024 u64 ino = btrfs_ino(BTRFS_I(inode));
1026 path = btrfs_alloc_path();
1030 min_key.objectid = ino;
1031 min_key.type = BTRFS_EXTENT_DATA_KEY;
1032 min_key.offset = *off;
1035 ret = btrfs_search_forward(root, &min_key, path, newer_than);
1039 if (min_key.objectid != ino)
1041 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
1044 leaf = path->nodes[0];
1045 extent = btrfs_item_ptr(leaf, path->slots[0],
1046 struct btrfs_file_extent_item);
1048 type = btrfs_file_extent_type(leaf, extent);
1049 if (type == BTRFS_FILE_EXTENT_REG &&
1050 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
1051 check_defrag_in_cache(inode, min_key.offset, thresh)) {
1052 *off = min_key.offset;
1053 btrfs_free_path(path);
1058 if (path->slots[0] < btrfs_header_nritems(leaf)) {
1059 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
1063 if (min_key.offset == (u64)-1)
1067 btrfs_release_path(path);
1070 btrfs_free_path(path);
1074 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
1076 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1077 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1078 struct extent_map *em;
1079 u64 len = PAGE_SIZE;
1082 * hopefully we have this extent in the tree already, try without
1083 * the full extent lock
1085 read_lock(&em_tree->lock);
1086 em = lookup_extent_mapping(em_tree, start, len);
1087 read_unlock(&em_tree->lock);
1090 struct extent_state *cached = NULL;
1091 u64 end = start + len - 1;
1093 /* get the big lock and read metadata off disk */
1094 lock_extent_bits(io_tree, start, end, &cached);
1095 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
1096 unlock_extent_cached(io_tree, start, end, &cached);
1105 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1107 struct extent_map *next;
1110 /* this is the last extent */
1111 if (em->start + em->len >= i_size_read(inode))
1114 next = defrag_lookup_extent(inode, em->start + em->len);
1115 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1117 else if ((em->block_start + em->block_len == next->block_start) &&
1118 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1121 free_extent_map(next);
1125 static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1126 u64 *last_len, u64 *skip, u64 *defrag_end,
1129 struct extent_map *em;
1131 bool next_mergeable = true;
1132 bool prev_mergeable = true;
1135 * make sure that once we start defragging an extent, we keep on
1138 if (start < *defrag_end)
1143 em = defrag_lookup_extent(inode, start);
1147 /* this will cover holes, and inline extents */
1148 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1154 prev_mergeable = false;
1156 next_mergeable = defrag_check_next_extent(inode, em);
1158 * we hit a real extent, if it is big or the next extent is not a
1159 * real extent, don't bother defragging it
1161 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1162 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1166 * last_len ends up being a counter of how many bytes we've defragged.
1167 * every time we choose not to defrag an extent, we reset *last_len
1168 * so that the next tiny extent will force a defrag.
1170 * The end result of this is that tiny extents before a single big
1171 * extent will force at least part of that big extent to be defragged.
1174 *defrag_end = extent_map_end(em);
1177 *skip = extent_map_end(em);
1181 free_extent_map(em);
1186 * it doesn't do much good to defrag one or two pages
1187 * at a time. This pulls in a nice chunk of pages
1188 * to COW and defrag.
1190 * It also makes sure the delalloc code has enough
1191 * dirty data to avoid making new small extents as part
1194 * It's a good idea to start RA on this range
1195 * before calling this.
1197 static int cluster_pages_for_defrag(struct inode *inode,
1198 struct page **pages,
1199 unsigned long start_index,
1200 unsigned long num_pages)
1202 unsigned long file_end;
1203 u64 isize = i_size_read(inode);
1210 struct btrfs_ordered_extent *ordered;
1211 struct extent_state *cached_state = NULL;
1212 struct extent_io_tree *tree;
1213 struct extent_changeset *data_reserved = NULL;
1214 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1216 file_end = (isize - 1) >> PAGE_SHIFT;
1217 if (!isize || start_index > file_end)
1220 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1222 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
1223 start_index << PAGE_SHIFT,
1224 page_cnt << PAGE_SHIFT);
1228 tree = &BTRFS_I(inode)->io_tree;
1230 /* step one, lock all the pages */
1231 for (i = 0; i < page_cnt; i++) {
1234 page = find_or_create_page(inode->i_mapping,
1235 start_index + i, mask);
1239 page_start = page_offset(page);
1240 page_end = page_start + PAGE_SIZE - 1;
1242 lock_extent_bits(tree, page_start, page_end,
1244 ordered = btrfs_lookup_ordered_extent(inode,
1246 unlock_extent_cached(tree, page_start, page_end,
1252 btrfs_start_ordered_extent(inode, ordered, 1);
1253 btrfs_put_ordered_extent(ordered);
1256 * we unlocked the page above, so we need check if
1257 * it was released or not.
1259 if (page->mapping != inode->i_mapping) {
1266 if (!PageUptodate(page)) {
1267 btrfs_readpage(NULL, page);
1269 if (!PageUptodate(page)) {
1277 if (page->mapping != inode->i_mapping) {
1289 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1293 * so now we have a nice long stream of locked
1294 * and up to date pages, lets wait on them
1296 for (i = 0; i < i_done; i++)
1297 wait_on_page_writeback(pages[i]);
1299 page_start = page_offset(pages[0]);
1300 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
1302 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1303 page_start, page_end - 1, &cached_state);
1304 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1305 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1306 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1309 if (i_done != page_cnt) {
1310 spin_lock(&BTRFS_I(inode)->lock);
1311 BTRFS_I(inode)->outstanding_extents++;
1312 spin_unlock(&BTRFS_I(inode)->lock);
1313 btrfs_delalloc_release_space(inode, data_reserved,
1314 start_index << PAGE_SHIFT,
1315 (page_cnt - i_done) << PAGE_SHIFT, true);
1319 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1322 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1323 page_start, page_end - 1, &cached_state);
1325 for (i = 0; i < i_done; i++) {
1326 clear_page_dirty_for_io(pages[i]);
1327 ClearPageChecked(pages[i]);
1328 set_page_extent_mapped(pages[i]);
1329 set_page_dirty(pages[i]);
1330 unlock_page(pages[i]);
1333 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1335 extent_changeset_free(data_reserved);
1338 for (i = 0; i < i_done; i++) {
1339 unlock_page(pages[i]);
1342 btrfs_delalloc_release_space(inode, data_reserved,
1343 start_index << PAGE_SHIFT,
1344 page_cnt << PAGE_SHIFT, true);
1345 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1347 extent_changeset_free(data_reserved);
1352 int btrfs_defrag_file(struct inode *inode, struct file *file,
1353 struct btrfs_ioctl_defrag_range_args *range,
1354 u64 newer_than, unsigned long max_to_defrag)
1356 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1357 struct btrfs_root *root = BTRFS_I(inode)->root;
1358 struct file_ra_state *ra = NULL;
1359 unsigned long last_index;
1360 u64 isize = i_size_read(inode);
1364 u64 newer_off = range->start;
1366 unsigned long ra_index = 0;
1368 int defrag_count = 0;
1369 int compress_type = BTRFS_COMPRESS_ZLIB;
1370 u32 extent_thresh = range->extent_thresh;
1371 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
1372 unsigned long cluster = max_cluster;
1373 u64 new_align = ~((u64)SZ_128K - 1);
1374 struct page **pages = NULL;
1375 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
1380 if (range->start >= isize)
1384 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1386 if (range->compress_type)
1387 compress_type = range->compress_type;
1390 if (extent_thresh == 0)
1391 extent_thresh = SZ_256K;
1394 * If we were not given a file, allocate a readahead context. As
1395 * readahead is just an optimization, defrag will work without it so
1396 * we don't error out.
1399 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1401 file_ra_state_init(ra, inode->i_mapping);
1406 pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
1412 /* find the last page to defrag */
1413 if (range->start + range->len > range->start) {
1414 last_index = min_t(u64, isize - 1,
1415 range->start + range->len - 1) >> PAGE_SHIFT;
1417 last_index = (isize - 1) >> PAGE_SHIFT;
1421 ret = find_new_extents(root, inode, newer_than,
1422 &newer_off, SZ_64K);
1424 range->start = newer_off;
1426 * we always align our defrag to help keep
1427 * the extents in the file evenly spaced
1429 i = (newer_off & new_align) >> PAGE_SHIFT;
1433 i = range->start >> PAGE_SHIFT;
1436 max_to_defrag = last_index - i + 1;
1439 * make writeback starts from i, so the defrag range can be
1440 * written sequentially.
1442 if (i < inode->i_mapping->writeback_index)
1443 inode->i_mapping->writeback_index = i;
1445 while (i <= last_index && defrag_count < max_to_defrag &&
1446 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
1448 * make sure we stop running if someone unmounts
1451 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1454 if (btrfs_defrag_cancelled(fs_info)) {
1455 btrfs_debug(fs_info, "defrag_file cancelled");
1460 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
1461 extent_thresh, &last_len, &skip,
1462 &defrag_end, do_compress)){
1465 * the should_defrag function tells us how much to skip
1466 * bump our counter by the suggested amount
1468 next = DIV_ROUND_UP(skip, PAGE_SIZE);
1469 i = max(i + 1, next);
1474 cluster = (PAGE_ALIGN(defrag_end) >>
1476 cluster = min(cluster, max_cluster);
1478 cluster = max_cluster;
1481 if (i + cluster > ra_index) {
1482 ra_index = max(i, ra_index);
1484 page_cache_sync_readahead(inode->i_mapping, ra,
1485 file, ra_index, cluster);
1486 ra_index += cluster;
1491 BTRFS_I(inode)->defrag_compress = compress_type;
1492 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1494 inode_unlock(inode);
1498 defrag_count += ret;
1499 balance_dirty_pages_ratelimited(inode->i_mapping);
1500 inode_unlock(inode);
1503 if (newer_off == (u64)-1)
1509 newer_off = max(newer_off + 1,
1510 (u64)i << PAGE_SHIFT);
1512 ret = find_new_extents(root, inode, newer_than,
1513 &newer_off, SZ_64K);
1515 range->start = newer_off;
1516 i = (newer_off & new_align) >> PAGE_SHIFT;
1523 last_len += ret << PAGE_SHIFT;
1531 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1532 filemap_flush(inode->i_mapping);
1533 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1534 &BTRFS_I(inode)->runtime_flags))
1535 filemap_flush(inode->i_mapping);
1538 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1539 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1540 } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
1541 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1549 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
1550 inode_unlock(inode);
1558 static noinline int btrfs_ioctl_resize(struct file *file,
1561 struct inode *inode = file_inode(file);
1562 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1566 struct btrfs_root *root = BTRFS_I(inode)->root;
1567 struct btrfs_ioctl_vol_args *vol_args;
1568 struct btrfs_trans_handle *trans;
1569 struct btrfs_device *device = NULL;
1572 char *devstr = NULL;
1576 if (!capable(CAP_SYS_ADMIN))
1579 ret = mnt_want_write_file(file);
1583 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
1584 mnt_drop_write_file(file);
1585 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1588 vol_args = memdup_user(arg, sizeof(*vol_args));
1589 if (IS_ERR(vol_args)) {
1590 ret = PTR_ERR(vol_args);
1594 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1596 sizestr = vol_args->name;
1597 devstr = strchr(sizestr, ':');
1599 sizestr = devstr + 1;
1601 devstr = vol_args->name;
1602 ret = kstrtoull(devstr, 10, &devid);
1609 btrfs_info(fs_info, "resizing devid %llu", devid);
1612 device = btrfs_find_device(fs_info, devid, NULL, NULL);
1614 btrfs_info(fs_info, "resizer unable to find device %llu",
1620 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1622 "resizer unable to apply on readonly device %llu",
1628 if (!strcmp(sizestr, "max"))
1629 new_size = device->bdev->bd_inode->i_size;
1631 if (sizestr[0] == '-') {
1634 } else if (sizestr[0] == '+') {
1638 new_size = memparse(sizestr, &retptr);
1639 if (*retptr != '\0' || new_size == 0) {
1645 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1650 old_size = btrfs_device_get_total_bytes(device);
1653 if (new_size > old_size) {
1657 new_size = old_size - new_size;
1658 } else if (mod > 0) {
1659 if (new_size > ULLONG_MAX - old_size) {
1663 new_size = old_size + new_size;
1666 if (new_size < SZ_256M) {
1670 if (new_size > device->bdev->bd_inode->i_size) {
1675 new_size = round_down(new_size, fs_info->sectorsize);
1677 btrfs_info_in_rcu(fs_info, "new size for %s is %llu",
1678 rcu_str_deref(device->name), new_size);
1680 if (new_size > old_size) {
1681 trans = btrfs_start_transaction(root, 0);
1682 if (IS_ERR(trans)) {
1683 ret = PTR_ERR(trans);
1686 ret = btrfs_grow_device(trans, device, new_size);
1687 btrfs_commit_transaction(trans);
1688 } else if (new_size < old_size) {
1689 ret = btrfs_shrink_device(device, new_size);
1690 } /* equal, nothing need to do */
1695 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
1696 mnt_drop_write_file(file);
1700 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1701 const char *name, unsigned long fd, int subvol,
1702 u64 *transid, bool readonly,
1703 struct btrfs_qgroup_inherit *inherit)
1708 if (!S_ISDIR(file_inode(file)->i_mode))
1711 ret = mnt_want_write_file(file);
1715 namelen = strlen(name);
1716 if (strchr(name, '/')) {
1718 goto out_drop_write;
1721 if (name[0] == '.' &&
1722 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1724 goto out_drop_write;
1728 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1729 NULL, transid, readonly, inherit);
1731 struct fd src = fdget(fd);
1732 struct inode *src_inode;
1735 goto out_drop_write;
1738 src_inode = file_inode(src.file);
1739 if (src_inode->i_sb != file_inode(file)->i_sb) {
1740 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1741 "Snapshot src from another FS");
1743 } else if (!inode_owner_or_capable(src_inode)) {
1745 * Subvolume creation is not restricted, but snapshots
1746 * are limited to own subvolumes only
1750 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1751 BTRFS_I(src_inode)->root,
1752 transid, readonly, inherit);
1757 mnt_drop_write_file(file);
1762 static noinline int btrfs_ioctl_snap_create(struct file *file,
1763 void __user *arg, int subvol)
1765 struct btrfs_ioctl_vol_args *vol_args;
1768 if (!S_ISDIR(file_inode(file)->i_mode))
1771 vol_args = memdup_user(arg, sizeof(*vol_args));
1772 if (IS_ERR(vol_args))
1773 return PTR_ERR(vol_args);
1774 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1776 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1777 vol_args->fd, subvol,
1784 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1785 void __user *arg, int subvol)
1787 struct btrfs_ioctl_vol_args_v2 *vol_args;
1791 bool readonly = false;
1792 struct btrfs_qgroup_inherit *inherit = NULL;
1794 if (!S_ISDIR(file_inode(file)->i_mode))
1797 vol_args = memdup_user(arg, sizeof(*vol_args));
1798 if (IS_ERR(vol_args))
1799 return PTR_ERR(vol_args);
1800 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1802 if (vol_args->flags &
1803 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1804 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1809 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1811 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1813 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1814 if (vol_args->size > PAGE_SIZE) {
1818 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1819 if (IS_ERR(inherit)) {
1820 ret = PTR_ERR(inherit);
1825 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1826 vol_args->fd, subvol, ptr,
1831 if (ptr && copy_to_user(arg +
1832 offsetof(struct btrfs_ioctl_vol_args_v2,
1844 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1847 struct inode *inode = file_inode(file);
1848 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1849 struct btrfs_root *root = BTRFS_I(inode)->root;
1853 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1856 down_read(&fs_info->subvol_sem);
1857 if (btrfs_root_readonly(root))
1858 flags |= BTRFS_SUBVOL_RDONLY;
1859 up_read(&fs_info->subvol_sem);
1861 if (copy_to_user(arg, &flags, sizeof(flags)))
1867 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1870 struct inode *inode = file_inode(file);
1871 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1872 struct btrfs_root *root = BTRFS_I(inode)->root;
1873 struct btrfs_trans_handle *trans;
1878 if (!inode_owner_or_capable(inode))
1881 ret = mnt_want_write_file(file);
1885 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1887 goto out_drop_write;
1890 if (copy_from_user(&flags, arg, sizeof(flags))) {
1892 goto out_drop_write;
1895 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1897 goto out_drop_write;
1900 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1902 goto out_drop_write;
1905 down_write(&fs_info->subvol_sem);
1908 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1911 root_flags = btrfs_root_flags(&root->root_item);
1912 if (flags & BTRFS_SUBVOL_RDONLY) {
1913 btrfs_set_root_flags(&root->root_item,
1914 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1917 * Block RO -> RW transition if this subvolume is involved in
1920 spin_lock(&root->root_item_lock);
1921 if (root->send_in_progress == 0) {
1922 btrfs_set_root_flags(&root->root_item,
1923 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1924 spin_unlock(&root->root_item_lock);
1926 spin_unlock(&root->root_item_lock);
1928 "Attempt to set subvolume %llu read-write during send",
1929 root->root_key.objectid);
1935 trans = btrfs_start_transaction(root, 1);
1936 if (IS_ERR(trans)) {
1937 ret = PTR_ERR(trans);
1941 ret = btrfs_update_root(trans, fs_info->tree_root,
1942 &root->root_key, &root->root_item);
1944 btrfs_end_transaction(trans);
1948 ret = btrfs_commit_transaction(trans);
1952 btrfs_set_root_flags(&root->root_item, root_flags);
1954 up_write(&fs_info->subvol_sem);
1956 mnt_drop_write_file(file);
1961 static noinline int key_in_sk(struct btrfs_key *key,
1962 struct btrfs_ioctl_search_key *sk)
1964 struct btrfs_key test;
1967 test.objectid = sk->min_objectid;
1968 test.type = sk->min_type;
1969 test.offset = sk->min_offset;
1971 ret = btrfs_comp_cpu_keys(key, &test);
1975 test.objectid = sk->max_objectid;
1976 test.type = sk->max_type;
1977 test.offset = sk->max_offset;
1979 ret = btrfs_comp_cpu_keys(key, &test);
1985 static noinline int copy_to_sk(struct btrfs_path *path,
1986 struct btrfs_key *key,
1987 struct btrfs_ioctl_search_key *sk,
1990 unsigned long *sk_offset,
1994 struct extent_buffer *leaf;
1995 struct btrfs_ioctl_search_header sh;
1996 struct btrfs_key test;
1997 unsigned long item_off;
1998 unsigned long item_len;
2004 leaf = path->nodes[0];
2005 slot = path->slots[0];
2006 nritems = btrfs_header_nritems(leaf);
2008 if (btrfs_header_generation(leaf) > sk->max_transid) {
2012 found_transid = btrfs_header_generation(leaf);
2014 for (i = slot; i < nritems; i++) {
2015 item_off = btrfs_item_ptr_offset(leaf, i);
2016 item_len = btrfs_item_size_nr(leaf, i);
2018 btrfs_item_key_to_cpu(leaf, key, i);
2019 if (!key_in_sk(key, sk))
2022 if (sizeof(sh) + item_len > *buf_size) {
2029 * return one empty item back for v1, which does not
2033 *buf_size = sizeof(sh) + item_len;
2038 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2043 sh.objectid = key->objectid;
2044 sh.offset = key->offset;
2045 sh.type = key->type;
2047 sh.transid = found_transid;
2049 /* copy search result header */
2050 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2055 *sk_offset += sizeof(sh);
2058 char __user *up = ubuf + *sk_offset;
2060 if (read_extent_buffer_to_user(leaf, up,
2061 item_off, item_len)) {
2066 *sk_offset += item_len;
2070 if (ret) /* -EOVERFLOW from above */
2073 if (*num_found >= sk->nr_items) {
2080 test.objectid = sk->max_objectid;
2081 test.type = sk->max_type;
2082 test.offset = sk->max_offset;
2083 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2085 else if (key->offset < (u64)-1)
2087 else if (key->type < (u8)-1) {
2090 } else if (key->objectid < (u64)-1) {
2098 * 0: all items from this leaf copied, continue with next
2099 * 1: * more items can be copied, but unused buffer is too small
2100 * * all items were found
2101 * Either way, it will stops the loop which iterates to the next
2103 * -EOVERFLOW: item was to large for buffer
2104 * -EFAULT: could not copy extent buffer back to userspace
2109 static noinline int search_ioctl(struct inode *inode,
2110 struct btrfs_ioctl_search_key *sk,
2114 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
2115 struct btrfs_root *root;
2116 struct btrfs_key key;
2117 struct btrfs_path *path;
2120 unsigned long sk_offset = 0;
2122 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2123 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2127 path = btrfs_alloc_path();
2131 if (sk->tree_id == 0) {
2132 /* search the root of the inode that was passed */
2133 root = BTRFS_I(inode)->root;
2135 key.objectid = sk->tree_id;
2136 key.type = BTRFS_ROOT_ITEM_KEY;
2137 key.offset = (u64)-1;
2138 root = btrfs_read_fs_root_no_name(info, &key);
2140 btrfs_free_path(path);
2141 return PTR_ERR(root);
2145 key.objectid = sk->min_objectid;
2146 key.type = sk->min_type;
2147 key.offset = sk->min_offset;
2150 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2156 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
2157 &sk_offset, &num_found);
2158 btrfs_release_path(path);
2166 sk->nr_items = num_found;
2167 btrfs_free_path(path);
2171 static noinline int btrfs_ioctl_tree_search(struct file *file,
2174 struct btrfs_ioctl_search_args __user *uargs;
2175 struct btrfs_ioctl_search_key sk;
2176 struct inode *inode;
2180 if (!capable(CAP_SYS_ADMIN))
2183 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2185 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2188 buf_size = sizeof(uargs->buf);
2190 inode = file_inode(file);
2191 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2194 * In the origin implementation an overflow is handled by returning a
2195 * search header with a len of zero, so reset ret.
2197 if (ret == -EOVERFLOW)
2200 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2205 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2208 struct btrfs_ioctl_search_args_v2 __user *uarg;
2209 struct btrfs_ioctl_search_args_v2 args;
2210 struct inode *inode;
2213 const size_t buf_limit = SZ_16M;
2215 if (!capable(CAP_SYS_ADMIN))
2218 /* copy search header and buffer size */
2219 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2220 if (copy_from_user(&args, uarg, sizeof(args)))
2223 buf_size = args.buf_size;
2225 /* limit result size to 16MB */
2226 if (buf_size > buf_limit)
2227 buf_size = buf_limit;
2229 inode = file_inode(file);
2230 ret = search_ioctl(inode, &args.key, &buf_size,
2231 (char __user *)(&uarg->buf[0]));
2232 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2234 else if (ret == -EOVERFLOW &&
2235 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2242 * Search INODE_REFs to identify path name of 'dirid' directory
2243 * in a 'tree_id' tree. and sets path name to 'name'.
2245 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2246 u64 tree_id, u64 dirid, char *name)
2248 struct btrfs_root *root;
2249 struct btrfs_key key;
2255 struct btrfs_inode_ref *iref;
2256 struct extent_buffer *l;
2257 struct btrfs_path *path;
2259 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2264 path = btrfs_alloc_path();
2268 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
2270 key.objectid = tree_id;
2271 key.type = BTRFS_ROOT_ITEM_KEY;
2272 key.offset = (u64)-1;
2273 root = btrfs_read_fs_root_no_name(info, &key);
2275 ret = PTR_ERR(root);
2279 key.objectid = dirid;
2280 key.type = BTRFS_INODE_REF_KEY;
2281 key.offset = (u64)-1;
2284 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2288 ret = btrfs_previous_item(root, path, dirid,
2289 BTRFS_INODE_REF_KEY);
2299 slot = path->slots[0];
2300 btrfs_item_key_to_cpu(l, &key, slot);
2302 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2303 len = btrfs_inode_ref_name_len(l, iref);
2305 total_len += len + 1;
2307 ret = -ENAMETOOLONG;
2312 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2314 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2317 btrfs_release_path(path);
2318 key.objectid = key.offset;
2319 key.offset = (u64)-1;
2320 dirid = key.objectid;
2322 memmove(name, ptr, total_len);
2323 name[total_len] = '\0';
2326 btrfs_free_path(path);
2330 static int btrfs_search_path_in_tree_user(struct inode *inode,
2331 struct btrfs_ioctl_ino_lookup_user_args *args)
2333 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2334 struct super_block *sb = inode->i_sb;
2335 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2336 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2337 u64 dirid = args->dirid;
2338 unsigned long item_off;
2339 unsigned long item_len;
2340 struct btrfs_inode_ref *iref;
2341 struct btrfs_root_ref *rref;
2342 struct btrfs_root *root;
2343 struct btrfs_path *path;
2344 struct btrfs_key key, key2;
2345 struct extent_buffer *leaf;
2346 struct inode *temp_inode;
2353 path = btrfs_alloc_path();
2358 * If the bottom subvolume does not exist directly under upper_limit,
2359 * construct the path in from the bottom up.
2361 if (dirid != upper_limit.objectid) {
2362 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2364 key.objectid = treeid;
2365 key.type = BTRFS_ROOT_ITEM_KEY;
2366 key.offset = (u64)-1;
2367 root = btrfs_read_fs_root_no_name(fs_info, &key);
2369 ret = PTR_ERR(root);
2373 key.objectid = dirid;
2374 key.type = BTRFS_INODE_REF_KEY;
2375 key.offset = (u64)-1;
2377 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2380 } else if (ret > 0) {
2381 ret = btrfs_previous_item(root, path, dirid,
2382 BTRFS_INODE_REF_KEY);
2385 } else if (ret > 0) {
2391 leaf = path->nodes[0];
2392 slot = path->slots[0];
2393 btrfs_item_key_to_cpu(leaf, &key, slot);
2395 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2396 len = btrfs_inode_ref_name_len(leaf, iref);
2398 total_len += len + 1;
2399 if (ptr < args->path) {
2400 ret = -ENAMETOOLONG;
2405 read_extent_buffer(leaf, ptr,
2406 (unsigned long)(iref + 1), len);
2408 /* Check the read+exec permission of this directory */
2409 ret = btrfs_previous_item(root, path, dirid,
2410 BTRFS_INODE_ITEM_KEY);
2413 } else if (ret > 0) {
2418 leaf = path->nodes[0];
2419 slot = path->slots[0];
2420 btrfs_item_key_to_cpu(leaf, &key2, slot);
2421 if (key2.objectid != dirid) {
2426 temp_inode = btrfs_iget(sb, &key2, root, NULL);
2427 if (IS_ERR(temp_inode)) {
2428 ret = PTR_ERR(temp_inode);
2431 ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
2438 if (key.offset == upper_limit.objectid)
2440 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2445 btrfs_release_path(path);
2446 key.objectid = key.offset;
2447 key.offset = (u64)-1;
2448 dirid = key.objectid;
2451 memmove(args->path, ptr, total_len);
2452 args->path[total_len] = '\0';
2453 btrfs_release_path(path);
2456 /* Get the bottom subvolume's name from ROOT_REF */
2457 root = fs_info->tree_root;
2458 key.objectid = treeid;
2459 key.type = BTRFS_ROOT_REF_KEY;
2460 key.offset = args->treeid;
2461 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2464 } else if (ret > 0) {
2469 leaf = path->nodes[0];
2470 slot = path->slots[0];
2471 btrfs_item_key_to_cpu(leaf, &key, slot);
2473 item_off = btrfs_item_ptr_offset(leaf, slot);
2474 item_len = btrfs_item_size_nr(leaf, slot);
2475 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2476 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2477 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2482 /* Copy subvolume's name */
2483 item_off += sizeof(struct btrfs_root_ref);
2484 item_len -= sizeof(struct btrfs_root_ref);
2485 read_extent_buffer(leaf, args->name, item_off, item_len);
2486 args->name[item_len] = 0;
2489 btrfs_free_path(path);
2493 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2496 struct btrfs_ioctl_ino_lookup_args *args;
2497 struct inode *inode;
2500 args = memdup_user(argp, sizeof(*args));
2502 return PTR_ERR(args);
2504 inode = file_inode(file);
2507 * Unprivileged query to obtain the containing subvolume root id. The
2508 * path is reset so it's consistent with btrfs_search_path_in_tree.
2510 if (args->treeid == 0)
2511 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2513 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2518 if (!capable(CAP_SYS_ADMIN)) {
2523 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2524 args->treeid, args->objectid,
2528 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2536 * Version of ino_lookup ioctl (unprivileged)
2538 * The main differences from ino_lookup ioctl are:
2540 * 1. Read + Exec permission will be checked using inode_permission() during
2541 * path construction. -EACCES will be returned in case of failure.
2542 * 2. Path construction will be stopped at the inode number which corresponds
2543 * to the fd with which this ioctl is called. If constructed path does not
2544 * exist under fd's inode, -EACCES will be returned.
2545 * 3. The name of bottom subvolume is also searched and filled.
2547 static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2549 struct btrfs_ioctl_ino_lookup_user_args *args;
2550 struct inode *inode;
2553 args = memdup_user(argp, sizeof(*args));
2555 return PTR_ERR(args);
2557 inode = file_inode(file);
2559 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2560 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2562 * The subvolume does not exist under fd with which this is
2569 ret = btrfs_search_path_in_tree_user(inode, args);
2571 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2578 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2579 static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2581 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2582 struct btrfs_fs_info *fs_info;
2583 struct btrfs_root *root;
2584 struct btrfs_path *path;
2585 struct btrfs_key key;
2586 struct btrfs_root_item *root_item;
2587 struct btrfs_root_ref *rref;
2588 struct extent_buffer *leaf;
2589 unsigned long item_off;
2590 unsigned long item_len;
2591 struct inode *inode;
2595 path = btrfs_alloc_path();
2599 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2601 btrfs_free_path(path);
2605 inode = file_inode(file);
2606 fs_info = BTRFS_I(inode)->root->fs_info;
2608 /* Get root_item of inode's subvolume */
2609 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2610 key.type = BTRFS_ROOT_ITEM_KEY;
2611 key.offset = (u64)-1;
2612 root = btrfs_read_fs_root_no_name(fs_info, &key);
2614 ret = PTR_ERR(root);
2617 root_item = &root->root_item;
2619 subvol_info->treeid = key.objectid;
2621 subvol_info->generation = btrfs_root_generation(root_item);
2622 subvol_info->flags = btrfs_root_flags(root_item);
2624 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2625 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2627 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2630 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2631 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2632 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2634 subvol_info->otransid = btrfs_root_otransid(root_item);
2635 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2636 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2638 subvol_info->stransid = btrfs_root_stransid(root_item);
2639 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2640 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2642 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2643 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2644 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2646 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2647 /* Search root tree for ROOT_BACKREF of this subvolume */
2648 root = fs_info->tree_root;
2650 key.type = BTRFS_ROOT_BACKREF_KEY;
2652 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2655 } else if (path->slots[0] >=
2656 btrfs_header_nritems(path->nodes[0])) {
2657 ret = btrfs_next_leaf(root, path);
2660 } else if (ret > 0) {
2666 leaf = path->nodes[0];
2667 slot = path->slots[0];
2668 btrfs_item_key_to_cpu(leaf, &key, slot);
2669 if (key.objectid == subvol_info->treeid &&
2670 key.type == BTRFS_ROOT_BACKREF_KEY) {
2671 subvol_info->parent_id = key.offset;
2673 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2674 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2676 item_off = btrfs_item_ptr_offset(leaf, slot)
2677 + sizeof(struct btrfs_root_ref);
2678 item_len = btrfs_item_size_nr(leaf, slot)
2679 - sizeof(struct btrfs_root_ref);
2680 read_extent_buffer(leaf, subvol_info->name,
2681 item_off, item_len);
2688 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2692 btrfs_free_path(path);
2693 kzfree(subvol_info);
2698 * Return ROOT_REF information of the subvolume containing this inode
2699 * except the subvolume name.
2701 static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2703 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2704 struct btrfs_root_ref *rref;
2705 struct btrfs_root *root;
2706 struct btrfs_path *path;
2707 struct btrfs_key key;
2708 struct extent_buffer *leaf;
2709 struct inode *inode;
2715 path = btrfs_alloc_path();
2719 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2720 if (IS_ERR(rootrefs)) {
2721 btrfs_free_path(path);
2722 return PTR_ERR(rootrefs);
2725 inode = file_inode(file);
2726 root = BTRFS_I(inode)->root->fs_info->tree_root;
2727 objectid = BTRFS_I(inode)->root->root_key.objectid;
2729 key.objectid = objectid;
2730 key.type = BTRFS_ROOT_REF_KEY;
2731 key.offset = rootrefs->min_treeid;
2734 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2737 } else if (path->slots[0] >=
2738 btrfs_header_nritems(path->nodes[0])) {
2739 ret = btrfs_next_leaf(root, path);
2742 } else if (ret > 0) {
2748 leaf = path->nodes[0];
2749 slot = path->slots[0];
2751 btrfs_item_key_to_cpu(leaf, &key, slot);
2752 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2757 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2762 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2763 rootrefs->rootref[found].treeid = key.offset;
2764 rootrefs->rootref[found].dirid =
2765 btrfs_root_ref_dirid(leaf, rref);
2768 ret = btrfs_next_item(root, path);
2771 } else if (ret > 0) {
2778 if (!ret || ret == -EOVERFLOW) {
2779 rootrefs->num_items = found;
2780 /* update min_treeid for next search */
2782 rootrefs->min_treeid =
2783 rootrefs->rootref[found - 1].treeid + 1;
2784 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2789 btrfs_free_path(path);
2794 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2797 struct dentry *parent = file->f_path.dentry;
2798 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2799 struct dentry *dentry;
2800 struct inode *dir = d_inode(parent);
2801 struct inode *inode;
2802 struct btrfs_root *root = BTRFS_I(dir)->root;
2803 struct btrfs_root *dest = NULL;
2804 struct btrfs_ioctl_vol_args *vol_args;
2808 if (!S_ISDIR(dir->i_mode))
2811 vol_args = memdup_user(arg, sizeof(*vol_args));
2812 if (IS_ERR(vol_args))
2813 return PTR_ERR(vol_args);
2815 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2816 namelen = strlen(vol_args->name);
2817 if (strchr(vol_args->name, '/') ||
2818 strncmp(vol_args->name, "..", namelen) == 0) {
2823 err = mnt_want_write_file(file);
2828 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2830 goto out_drop_write;
2831 dentry = lookup_one_len(vol_args->name, parent, namelen);
2832 if (IS_ERR(dentry)) {
2833 err = PTR_ERR(dentry);
2834 goto out_unlock_dir;
2837 if (d_really_is_negative(dentry)) {
2842 inode = d_inode(dentry);
2843 dest = BTRFS_I(inode)->root;
2844 if (!capable(CAP_SYS_ADMIN)) {
2846 * Regular user. Only allow this with a special mount
2847 * option, when the user has write+exec access to the
2848 * subvol root, and when rmdir(2) would have been
2851 * Note that this is _not_ check that the subvol is
2852 * empty or doesn't contain data that we wouldn't
2853 * otherwise be able to delete.
2855 * Users who want to delete empty subvols should try
2859 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2863 * Do not allow deletion if the parent dir is the same
2864 * as the dir to be deleted. That means the ioctl
2865 * must be called on the dentry referencing the root
2866 * of the subvol, not a random directory contained
2873 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2878 /* check if subvolume may be deleted by a user */
2879 err = btrfs_may_delete(dir, dentry, 1);
2883 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2889 err = btrfs_delete_subvolume(dir, dentry);
2890 inode_unlock(inode);
2899 mnt_drop_write_file(file);
2905 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2907 struct inode *inode = file_inode(file);
2908 struct btrfs_root *root = BTRFS_I(inode)->root;
2909 struct btrfs_ioctl_defrag_range_args *range;
2912 ret = mnt_want_write_file(file);
2916 if (btrfs_root_readonly(root)) {
2921 switch (inode->i_mode & S_IFMT) {
2923 if (!capable(CAP_SYS_ADMIN)) {
2927 ret = btrfs_defrag_root(root);
2931 * Note that this does not check the file descriptor for write
2932 * access. This prevents defragmenting executables that are
2933 * running and allows defrag on files open in read-only mode.
2935 if (!capable(CAP_SYS_ADMIN) &&
2936 inode_permission(inode, MAY_WRITE)) {
2941 range = kzalloc(sizeof(*range), GFP_KERNEL);
2948 if (copy_from_user(range, argp,
2954 /* compression requires us to start the IO */
2955 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2956 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2957 range->extent_thresh = (u32)-1;
2960 /* the rest are all set to zero by kzalloc */
2961 range->len = (u64)-1;
2963 ret = btrfs_defrag_file(file_inode(file), file,
2964 range, BTRFS_OLDEST_GENERATION, 0);
2973 mnt_drop_write_file(file);
2977 static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
2979 struct btrfs_ioctl_vol_args *vol_args;
2982 if (!capable(CAP_SYS_ADMIN))
2985 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags))
2986 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2988 vol_args = memdup_user(arg, sizeof(*vol_args));
2989 if (IS_ERR(vol_args)) {
2990 ret = PTR_ERR(vol_args);
2994 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2995 ret = btrfs_init_new_device(fs_info, vol_args->name);
2998 btrfs_info(fs_info, "disk added %s", vol_args->name);
3002 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3006 static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
3008 struct inode *inode = file_inode(file);
3009 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3010 struct btrfs_ioctl_vol_args_v2 *vol_args;
3013 if (!capable(CAP_SYS_ADMIN))
3016 ret = mnt_want_write_file(file);
3020 vol_args = memdup_user(arg, sizeof(*vol_args));
3021 if (IS_ERR(vol_args)) {
3022 ret = PTR_ERR(vol_args);
3026 /* Check for compatibility reject unknown flags */
3027 if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) {
3032 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3033 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3037 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
3038 ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
3040 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
3041 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3043 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3046 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3047 btrfs_info(fs_info, "device deleted: id %llu",
3050 btrfs_info(fs_info, "device deleted: %s",
3056 mnt_drop_write_file(file);
3060 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
3062 struct inode *inode = file_inode(file);
3063 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3064 struct btrfs_ioctl_vol_args *vol_args;
3067 if (!capable(CAP_SYS_ADMIN))
3070 ret = mnt_want_write_file(file);
3074 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3075 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3076 goto out_drop_write;
3079 vol_args = memdup_user(arg, sizeof(*vol_args));
3080 if (IS_ERR(vol_args)) {
3081 ret = PTR_ERR(vol_args);
3085 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3086 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3089 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
3092 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3094 mnt_drop_write_file(file);
3099 static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3102 struct btrfs_ioctl_fs_info_args *fi_args;
3103 struct btrfs_device *device;
3104 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
3107 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
3112 fi_args->num_devices = fs_devices->num_devices;
3114 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
3115 if (device->devid > fi_args->max_id)
3116 fi_args->max_id = device->devid;
3120 memcpy(&fi_args->fsid, fs_info->fsid, sizeof(fi_args->fsid));
3121 fi_args->nodesize = fs_info->nodesize;
3122 fi_args->sectorsize = fs_info->sectorsize;
3123 fi_args->clone_alignment = fs_info->sectorsize;
3125 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3132 static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3135 struct btrfs_ioctl_dev_info_args *di_args;
3136 struct btrfs_device *dev;
3138 char *s_uuid = NULL;
3140 di_args = memdup_user(arg, sizeof(*di_args));
3141 if (IS_ERR(di_args))
3142 return PTR_ERR(di_args);
3144 if (!btrfs_is_empty_uuid(di_args->uuid))
3145 s_uuid = di_args->uuid;
3148 dev = btrfs_find_device(fs_info, di_args->devid, s_uuid, NULL);
3155 di_args->devid = dev->devid;
3156 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3157 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
3158 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
3160 strncpy(di_args->path, rcu_str_deref(dev->name),
3161 sizeof(di_args->path) - 1);
3162 di_args->path[sizeof(di_args->path) - 1] = 0;
3164 di_args->path[0] = '\0';
3169 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3176 static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
3180 page = grab_cache_page(inode->i_mapping, index);
3182 return ERR_PTR(-ENOMEM);
3184 if (!PageUptodate(page)) {
3187 ret = btrfs_readpage(NULL, page);
3189 return ERR_PTR(ret);
3191 if (!PageUptodate(page)) {
3194 return ERR_PTR(-EIO);
3196 if (page->mapping != inode->i_mapping) {
3199 return ERR_PTR(-EAGAIN);
3206 static int gather_extent_pages(struct inode *inode, struct page **pages,
3207 int num_pages, u64 off)
3210 pgoff_t index = off >> PAGE_SHIFT;
3212 for (i = 0; i < num_pages; i++) {
3214 pages[i] = extent_same_get_page(inode, index + i);
3215 if (IS_ERR(pages[i])) {
3216 int err = PTR_ERR(pages[i]);
3227 static int lock_extent_range(struct inode *inode, u64 off, u64 len,
3228 bool retry_range_locking)
3231 * Do any pending delalloc/csum calculations on inode, one way or
3232 * another, and lock file content.
3233 * The locking order is:
3236 * 2) range in the inode's io tree
3239 struct btrfs_ordered_extent *ordered;
3240 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
3241 ordered = btrfs_lookup_first_ordered_extent(inode,
3244 ordered->file_offset + ordered->len <= off ||
3245 ordered->file_offset >= off + len) &&
3246 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
3247 off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
3249 btrfs_put_ordered_extent(ordered);
3252 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
3254 btrfs_put_ordered_extent(ordered);
3255 if (!retry_range_locking)
3257 btrfs_wait_ordered_range(inode, off, len);
3262 static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
3264 inode_unlock(inode1);
3265 inode_unlock(inode2);
3268 static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
3270 if (inode1 < inode2)
3271 swap(inode1, inode2);
3273 inode_lock_nested(inode1, I_MUTEX_PARENT);
3274 inode_lock_nested(inode2, I_MUTEX_CHILD);
3277 static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
3278 struct inode *inode2, u64 loff2, u64 len)
3280 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3281 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3284 static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
3285 struct inode *inode2, u64 loff2, u64 len,
3286 bool retry_range_locking)
3290 if (inode1 < inode2) {
3291 swap(inode1, inode2);
3294 ret = lock_extent_range(inode1, loff1, len, retry_range_locking);
3297 ret = lock_extent_range(inode2, loff2, len, retry_range_locking);
3299 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,
3306 struct page **src_pages;
3307 struct page **dst_pages;
3310 static void btrfs_cmp_data_free(struct cmp_pages *cmp)
3315 for (i = 0; i < cmp->num_pages; i++) {
3316 pg = cmp->src_pages[i];
3320 cmp->src_pages[i] = NULL;
3322 pg = cmp->dst_pages[i];
3326 cmp->dst_pages[i] = NULL;
3331 static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
3332 struct inode *dst, u64 dst_loff,
3333 u64 len, struct cmp_pages *cmp)
3336 int num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT;
3338 cmp->num_pages = num_pages;
3340 ret = gather_extent_pages(src, cmp->src_pages, num_pages, loff);
3344 ret = gather_extent_pages(dst, cmp->dst_pages, num_pages, dst_loff);
3348 btrfs_cmp_data_free(cmp);
3352 static int btrfs_cmp_data(u64 len, struct cmp_pages *cmp)
3356 struct page *src_page, *dst_page;
3357 unsigned int cmp_len = PAGE_SIZE;
3358 void *addr, *dst_addr;
3362 if (len < PAGE_SIZE)
3365 BUG_ON(i >= cmp->num_pages);
3367 src_page = cmp->src_pages[i];
3368 dst_page = cmp->dst_pages[i];
3369 ASSERT(PageLocked(src_page));
3370 ASSERT(PageLocked(dst_page));
3372 addr = kmap_atomic(src_page);
3373 dst_addr = kmap_atomic(dst_page);
3375 flush_dcache_page(src_page);
3376 flush_dcache_page(dst_page);
3378 if (memcmp(addr, dst_addr, cmp_len))
3381 kunmap_atomic(addr);
3382 kunmap_atomic(dst_addr);
3394 static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
3398 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
3400 if (off + olen > inode->i_size || off + olen < off)
3403 /* if we extend to eof, continue to block boundary */
3404 if (off + len == inode->i_size)
3405 *plen = len = ALIGN(inode->i_size, bs) - off;
3407 /* Check that we are block aligned - btrfs_clone() requires this */
3408 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
3414 static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
3415 struct inode *dst, u64 dst_loff,
3416 struct cmp_pages *cmp)
3420 bool same_inode = (src == dst);
3421 u64 same_lock_start = 0;
3422 u64 same_lock_len = 0;
3424 ret = extent_same_check_offsets(src, loff, &len, olen);
3428 ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
3434 * Single inode case wants the same checks, except we
3435 * don't want our length pushed out past i_size as
3436 * comparing that data range makes no sense.
3438 * extent_same_check_offsets() will do this for an
3439 * unaligned length at i_size, so catch it here and
3440 * reject the request.
3442 * This effectively means we require aligned extents
3443 * for the single-inode case, whereas the other cases
3444 * allow an unaligned length so long as it ends at
3450 /* Check for overlapping ranges */
3451 if (dst_loff + len > loff && dst_loff < loff + len)
3454 same_lock_start = min_t(u64, loff, dst_loff);
3455 same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
3459 ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, cmp);
3464 ret = lock_extent_range(src, same_lock_start, same_lock_len,
3467 ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,
3470 * If one of the inodes has dirty pages in the respective range or
3471 * ordered extents, we need to flush dellaloc and wait for all ordered
3472 * extents in the range. We must unlock the pages and the ranges in the
3473 * io trees to avoid deadlocks when flushing delalloc (requires locking
3474 * pages) and when waiting for ordered extents to complete (they require
3477 if (ret == -EAGAIN) {
3479 * Ranges in the io trees already unlocked. Now unlock all
3480 * pages before waiting for all IO to complete.
3482 btrfs_cmp_data_free(cmp);
3484 btrfs_wait_ordered_range(src, same_lock_start,
3487 btrfs_wait_ordered_range(src, loff, len);
3488 btrfs_wait_ordered_range(dst, dst_loff, len);
3494 /* ranges in the io trees already unlocked */
3495 btrfs_cmp_data_free(cmp);
3499 /* pass original length for comparison so we stay within i_size */
3500 ret = btrfs_cmp_data(olen, cmp);
3502 ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
3505 unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start,
3506 same_lock_start + same_lock_len - 1);
3508 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3510 btrfs_cmp_data_free(cmp);
3515 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3517 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3518 struct inode *dst, u64 dst_loff)
3521 struct cmp_pages cmp;
3522 int num_pages = PAGE_ALIGN(BTRFS_MAX_DEDUPE_LEN) >> PAGE_SHIFT;
3523 bool same_inode = (src == dst);
3524 u64 i, tail_len, chunk_count;
3532 btrfs_double_inode_lock(src, dst);
3534 /* don't make the dst file partly checksummed */
3535 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3536 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
3541 tail_len = olen % BTRFS_MAX_DEDUPE_LEN;
3542 chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN);
3543 if (chunk_count == 0)
3544 num_pages = PAGE_ALIGN(tail_len) >> PAGE_SHIFT;
3547 * If deduping ranges in the same inode, locking rules make it
3548 * mandatory to always lock pages in ascending order to avoid deadlocks
3549 * with concurrent tasks (such as starting writeback/delalloc).
3551 if (same_inode && dst_loff < loff)
3552 swap(loff, dst_loff);
3555 * We must gather up all the pages before we initiate our extent
3556 * locking. We use an array for the page pointers. Size of the array is
3557 * bounded by len, which is in turn bounded by BTRFS_MAX_DEDUPE_LEN.
3559 cmp.src_pages = kvmalloc_array(num_pages, sizeof(struct page *),
3560 GFP_KERNEL | __GFP_ZERO);
3561 cmp.dst_pages = kvmalloc_array(num_pages, sizeof(struct page *),
3562 GFP_KERNEL | __GFP_ZERO);
3563 if (!cmp.src_pages || !cmp.dst_pages) {
3568 for (i = 0; i < chunk_count; i++) {
3569 ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
3570 dst, dst_loff, &cmp);
3574 loff += BTRFS_MAX_DEDUPE_LEN;
3575 dst_loff += BTRFS_MAX_DEDUPE_LEN;
3579 ret = btrfs_extent_same_range(src, loff, tail_len, dst,
3583 kvfree(cmp.src_pages);
3584 kvfree(cmp.dst_pages);
3590 btrfs_double_inode_unlock(src, dst);
3595 int btrfs_dedupe_file_range(struct file *src_file, loff_t src_loff,
3596 struct file *dst_file, loff_t dst_loff,
3599 struct inode *src = file_inode(src_file);
3600 struct inode *dst = file_inode(dst_file);
3601 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3603 if (WARN_ON_ONCE(bs < PAGE_SIZE)) {
3605 * Btrfs does not support blocksize < page_size. As a
3606 * result, btrfs_cmp_data() won't correctly handle
3607 * this situation without an update.
3612 return btrfs_extent_same(src, src_loff, olen, dst, dst_loff);
3615 static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3616 struct inode *inode,
3622 struct btrfs_root *root = BTRFS_I(inode)->root;
3625 inode_inc_iversion(inode);
3626 if (!no_time_update)
3627 inode->i_mtime = inode->i_ctime = current_time(inode);
3629 * We round up to the block size at eof when determining which
3630 * extents to clone above, but shouldn't round up the file size.
3632 if (endoff > destoff + olen)
3633 endoff = destoff + olen;
3634 if (endoff > inode->i_size)
3635 btrfs_i_size_write(BTRFS_I(inode), endoff);
3637 ret = btrfs_update_inode(trans, root, inode);
3639 btrfs_abort_transaction(trans, ret);
3640 btrfs_end_transaction(trans);
3643 ret = btrfs_end_transaction(trans);
3648 static void clone_update_extent_map(struct btrfs_inode *inode,
3649 const struct btrfs_trans_handle *trans,
3650 const struct btrfs_path *path,
3651 const u64 hole_offset,
3654 struct extent_map_tree *em_tree = &inode->extent_tree;
3655 struct extent_map *em;
3658 em = alloc_extent_map();
3660 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
3665 struct btrfs_file_extent_item *fi;
3667 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3668 struct btrfs_file_extent_item);
3669 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3670 em->generation = -1;
3671 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3672 BTRFS_FILE_EXTENT_INLINE)
3673 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3674 &inode->runtime_flags);
3676 em->start = hole_offset;
3678 em->ram_bytes = em->len;
3679 em->orig_start = hole_offset;
3680 em->block_start = EXTENT_MAP_HOLE;
3682 em->orig_block_len = 0;
3683 em->compress_type = BTRFS_COMPRESS_NONE;
3684 em->generation = trans->transid;
3688 write_lock(&em_tree->lock);
3689 ret = add_extent_mapping(em_tree, em, 1);
3690 write_unlock(&em_tree->lock);
3691 if (ret != -EEXIST) {
3692 free_extent_map(em);
3695 btrfs_drop_extent_cache(inode, em->start,
3696 em->start + em->len - 1, 0);
3700 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
3704 * Make sure we do not end up inserting an inline extent into a file that has
3705 * already other (non-inline) extents. If a file has an inline extent it can
3706 * not have any other extents and the (single) inline extent must start at the
3707 * file offset 0. Failing to respect these rules will lead to file corruption,
3708 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3710 * We can have extents that have been already written to disk or we can have
3711 * dirty ranges still in delalloc, in which case the extent maps and items are
3712 * created only when we run delalloc, and the delalloc ranges might fall outside
3713 * the range we are currently locking in the inode's io tree. So we check the
3714 * inode's i_size because of that (i_size updates are done while holding the
3715 * i_mutex, which we are holding here).
3716 * We also check to see if the inode has a size not greater than "datal" but has
3717 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3718 * protected against such concurrent fallocate calls by the i_mutex).
3720 * If the file has no extents but a size greater than datal, do not allow the
3721 * copy because we would need turn the inline extent into a non-inline one (even
3722 * with NO_HOLES enabled). If we find our destination inode only has one inline
3723 * extent, just overwrite it with the source inline extent if its size is less
3724 * than the source extent's size, or we could copy the source inline extent's
3725 * data into the destination inode's inline extent if the later is greater then
3728 static int clone_copy_inline_extent(struct inode *dst,
3729 struct btrfs_trans_handle *trans,
3730 struct btrfs_path *path,
3731 struct btrfs_key *new_key,
3732 const u64 drop_start,
3738 struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb);
3739 struct btrfs_root *root = BTRFS_I(dst)->root;
3740 const u64 aligned_end = ALIGN(new_key->offset + datal,
3741 fs_info->sectorsize);
3743 struct btrfs_key key;
3745 if (new_key->offset > 0)
3748 key.objectid = btrfs_ino(BTRFS_I(dst));
3749 key.type = BTRFS_EXTENT_DATA_KEY;
3751 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3754 } else if (ret > 0) {
3755 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3756 ret = btrfs_next_leaf(root, path);
3760 goto copy_inline_extent;
3762 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3763 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3764 key.type == BTRFS_EXTENT_DATA_KEY) {
3765 ASSERT(key.offset > 0);
3768 } else if (i_size_read(dst) <= datal) {
3769 struct btrfs_file_extent_item *ei;
3773 * If the file size is <= datal, make sure there are no other
3774 * extents following (can happen do to an fallocate call with
3775 * the flag FALLOC_FL_KEEP_SIZE).
3777 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3778 struct btrfs_file_extent_item);
3780 * If it's an inline extent, it can not have other extents
3783 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3784 BTRFS_FILE_EXTENT_INLINE)
3785 goto copy_inline_extent;
3787 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3788 if (ext_len > aligned_end)
3791 ret = btrfs_next_item(root, path);
3794 } else if (ret == 0) {
3795 btrfs_item_key_to_cpu(path->nodes[0], &key,
3797 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3798 key.type == BTRFS_EXTENT_DATA_KEY)
3805 * We have no extent items, or we have an extent at offset 0 which may
3806 * or may not be inlined. All these cases are dealt the same way.
3808 if (i_size_read(dst) > datal) {
3810 * If the destination inode has an inline extent...
3811 * This would require copying the data from the source inline
3812 * extent into the beginning of the destination's inline extent.
3813 * But this is really complex, both extents can be compressed
3814 * or just one of them, which would require decompressing and
3815 * re-compressing data (which could increase the new compressed
3816 * size, not allowing the compressed data to fit anymore in an
3818 * So just don't support this case for now (it should be rare,
3819 * we are not really saving space when cloning inline extents).
3824 btrfs_release_path(path);
3825 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3828 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3833 const u32 start = btrfs_file_extent_calc_inline_size(0);
3835 memmove(inline_data + start, inline_data + start + skip, datal);
3838 write_extent_buffer(path->nodes[0], inline_data,
3839 btrfs_item_ptr_offset(path->nodes[0],
3842 inode_add_bytes(dst, datal);
3848 * btrfs_clone() - clone a range from inode file to another
3850 * @src: Inode to clone from
3851 * @inode: Inode to clone to
3852 * @off: Offset within source to start clone from
3853 * @olen: Original length, passed by user, of range to clone
3854 * @olen_aligned: Block-aligned value of olen
3855 * @destoff: Offset within @inode to start clone
3856 * @no_time_update: Whether to update mtime/ctime on the target inode
3858 static int btrfs_clone(struct inode *src, struct inode *inode,
3859 const u64 off, const u64 olen, const u64 olen_aligned,
3860 const u64 destoff, int no_time_update)
3862 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3863 struct btrfs_root *root = BTRFS_I(inode)->root;
3864 struct btrfs_path *path = NULL;
3865 struct extent_buffer *leaf;
3866 struct btrfs_trans_handle *trans;
3868 struct btrfs_key key;
3872 const u64 len = olen_aligned;
3873 u64 last_dest_end = destoff;
3876 buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
3880 path = btrfs_alloc_path();
3886 path->reada = READA_FORWARD;
3888 key.objectid = btrfs_ino(BTRFS_I(src));
3889 key.type = BTRFS_EXTENT_DATA_KEY;
3893 u64 next_key_min_offset = key.offset + 1;
3896 * note the key will change type as we walk through the
3899 path->leave_spinning = 1;
3900 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3905 * First search, if no extent item that starts at offset off was
3906 * found but the previous item is an extent item, it's possible
3907 * it might overlap our target range, therefore process it.
3909 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3910 btrfs_item_key_to_cpu(path->nodes[0], &key,
3911 path->slots[0] - 1);
3912 if (key.type == BTRFS_EXTENT_DATA_KEY)
3916 nritems = btrfs_header_nritems(path->nodes[0]);
3918 if (path->slots[0] >= nritems) {
3919 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3924 nritems = btrfs_header_nritems(path->nodes[0]);
3926 leaf = path->nodes[0];
3927 slot = path->slots[0];
3929 btrfs_item_key_to_cpu(leaf, &key, slot);
3930 if (key.type > BTRFS_EXTENT_DATA_KEY ||
3931 key.objectid != btrfs_ino(BTRFS_I(src)))
3934 if (key.type == BTRFS_EXTENT_DATA_KEY) {
3935 struct btrfs_file_extent_item *extent;
3938 struct btrfs_key new_key;
3939 u64 disko = 0, diskl = 0;
3940 u64 datao = 0, datal = 0;
3944 extent = btrfs_item_ptr(leaf, slot,
3945 struct btrfs_file_extent_item);
3946 comp = btrfs_file_extent_compression(leaf, extent);
3947 type = btrfs_file_extent_type(leaf, extent);
3948 if (type == BTRFS_FILE_EXTENT_REG ||
3949 type == BTRFS_FILE_EXTENT_PREALLOC) {
3950 disko = btrfs_file_extent_disk_bytenr(leaf,
3952 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3954 datao = btrfs_file_extent_offset(leaf, extent);
3955 datal = btrfs_file_extent_num_bytes(leaf,
3957 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3958 /* take upper bound, may be compressed */
3959 datal = btrfs_file_extent_ram_bytes(leaf,
3964 * The first search might have left us at an extent
3965 * item that ends before our target range's start, can
3966 * happen if we have holes and NO_HOLES feature enabled.
3968 if (key.offset + datal <= off) {
3971 } else if (key.offset >= off + len) {
3974 next_key_min_offset = key.offset + datal;
3975 size = btrfs_item_size_nr(leaf, slot);
3976 read_extent_buffer(leaf, buf,
3977 btrfs_item_ptr_offset(leaf, slot),
3980 btrfs_release_path(path);
3981 path->leave_spinning = 0;
3983 memcpy(&new_key, &key, sizeof(new_key));
3984 new_key.objectid = btrfs_ino(BTRFS_I(inode));
3985 if (off <= key.offset)
3986 new_key.offset = key.offset + destoff - off;
3988 new_key.offset = destoff;
3991 * Deal with a hole that doesn't have an extent item
3992 * that represents it (NO_HOLES feature enabled).
3993 * This hole is either in the middle of the cloning
3994 * range or at the beginning (fully overlaps it or
3995 * partially overlaps it).
3997 if (new_key.offset != last_dest_end)
3998 drop_start = last_dest_end;
4000 drop_start = new_key.offset;
4003 * 1 - adjusting old extent (we may have to split it)
4004 * 1 - add new extent
4007 trans = btrfs_start_transaction(root, 3);
4008 if (IS_ERR(trans)) {
4009 ret = PTR_ERR(trans);
4013 if (type == BTRFS_FILE_EXTENT_REG ||
4014 type == BTRFS_FILE_EXTENT_PREALLOC) {
4016 * a | --- range to clone ---| b
4017 * | ------------- extent ------------- |
4020 /* subtract range b */
4021 if (key.offset + datal > off + len)
4022 datal = off + len - key.offset;
4024 /* subtract range a */
4025 if (off > key.offset) {
4026 datao += off - key.offset;
4027 datal -= off - key.offset;
4030 ret = btrfs_drop_extents(trans, root, inode,
4032 new_key.offset + datal,
4035 if (ret != -EOPNOTSUPP)
4036 btrfs_abort_transaction(trans,
4038 btrfs_end_transaction(trans);
4042 ret = btrfs_insert_empty_item(trans, root, path,
4045 btrfs_abort_transaction(trans, ret);
4046 btrfs_end_transaction(trans);
4050 leaf = path->nodes[0];
4051 slot = path->slots[0];
4052 write_extent_buffer(leaf, buf,
4053 btrfs_item_ptr_offset(leaf, slot),
4056 extent = btrfs_item_ptr(leaf, slot,
4057 struct btrfs_file_extent_item);
4059 /* disko == 0 means it's a hole */
4063 btrfs_set_file_extent_offset(leaf, extent,
4065 btrfs_set_file_extent_num_bytes(leaf, extent,
4069 inode_add_bytes(inode, datal);
4070 ret = btrfs_inc_extent_ref(trans,
4073 root->root_key.objectid,
4074 btrfs_ino(BTRFS_I(inode)),
4075 new_key.offset - datao);
4077 btrfs_abort_transaction(trans,
4079 btrfs_end_transaction(trans);
4084 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
4088 if (off > key.offset) {
4089 skip = off - key.offset;
4090 new_key.offset += skip;
4093 if (key.offset + datal > off + len)
4094 trim = key.offset + datal - (off + len);
4096 if (comp && (skip || trim)) {
4098 btrfs_end_transaction(trans);
4101 size -= skip + trim;
4102 datal -= skip + trim;
4104 ret = clone_copy_inline_extent(inode,
4111 if (ret != -EOPNOTSUPP)
4112 btrfs_abort_transaction(trans,
4114 btrfs_end_transaction(trans);
4117 leaf = path->nodes[0];
4118 slot = path->slots[0];
4121 /* If we have an implicit hole (NO_HOLES feature). */
4122 if (drop_start < new_key.offset)
4123 clone_update_extent_map(BTRFS_I(inode), trans,
4125 new_key.offset - drop_start);
4127 clone_update_extent_map(BTRFS_I(inode), trans,
4130 btrfs_mark_buffer_dirty(leaf);
4131 btrfs_release_path(path);
4133 last_dest_end = ALIGN(new_key.offset + datal,
4134 fs_info->sectorsize);
4135 ret = clone_finish_inode_update(trans, inode,
4141 if (new_key.offset + datal >= destoff + len)
4144 btrfs_release_path(path);
4145 key.offset = next_key_min_offset;
4147 if (fatal_signal_pending(current)) {
4154 if (last_dest_end < destoff + len) {
4156 * We have an implicit hole (NO_HOLES feature is enabled) that
4157 * fully or partially overlaps our cloning range at its end.
4159 btrfs_release_path(path);
4162 * 1 - remove extent(s)
4165 trans = btrfs_start_transaction(root, 2);
4166 if (IS_ERR(trans)) {
4167 ret = PTR_ERR(trans);
4170 ret = btrfs_drop_extents(trans, root, inode,
4171 last_dest_end, destoff + len, 1);
4173 if (ret != -EOPNOTSUPP)
4174 btrfs_abort_transaction(trans, ret);
4175 btrfs_end_transaction(trans);
4178 clone_update_extent_map(BTRFS_I(inode), trans, NULL,
4180 destoff + len - last_dest_end);
4181 ret = clone_finish_inode_update(trans, inode, destoff + len,
4182 destoff, olen, no_time_update);
4186 btrfs_free_path(path);
4191 static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
4192 u64 off, u64 olen, u64 destoff)
4194 struct inode *inode = file_inode(file);
4195 struct inode *src = file_inode(file_src);
4196 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4197 struct btrfs_root *root = BTRFS_I(inode)->root;
4200 u64 bs = fs_info->sb->s_blocksize;
4201 int same_inode = src == inode;
4205 * - split compressed inline extents. annoying: we need to
4206 * decompress into destination's address_space (the file offset
4207 * may change, so source mapping won't do), then recompress (or
4208 * otherwise reinsert) a subrange.
4210 * - split destination inode's inline extents. The inline extents can
4211 * be either compressed or non-compressed.
4214 if (btrfs_root_readonly(root))
4217 if (file_src->f_path.mnt != file->f_path.mnt ||
4218 src->i_sb != inode->i_sb)
4221 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
4225 btrfs_double_inode_lock(src, inode);
4230 /* don't make the dst file partly checksummed */
4231 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
4232 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
4237 /* determine range to clone */
4239 if (off + len > src->i_size || off + len < off)
4242 olen = len = src->i_size - off;
4243 /* if we extend to eof, continue to block boundary */
4244 if (off + len == src->i_size)
4245 len = ALIGN(src->i_size, bs) - off;
4252 /* verify the end result is block aligned */
4253 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
4254 !IS_ALIGNED(destoff, bs))
4257 /* verify if ranges are overlapped within the same file */
4259 if (destoff + len > off && destoff < off + len)
4263 if (destoff > inode->i_size) {
4264 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
4270 * Lock the target range too. Right after we replace the file extent
4271 * items in the fs tree (which now point to the cloned data), we might
4272 * have a worker replace them with extent items relative to a write
4273 * operation that was issued before this clone operation (i.e. confront
4274 * with inode.c:btrfs_finish_ordered_io).
4277 u64 lock_start = min_t(u64, off, destoff);
4278 u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
4280 ret = lock_extent_range(src, lock_start, lock_len, true);
4282 ret = btrfs_double_extent_lock(src, off, inode, destoff, len,
4287 /* ranges in the io trees already unlocked */
4291 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
4294 u64 lock_start = min_t(u64, off, destoff);
4295 u64 lock_end = max_t(u64, off, destoff) + len - 1;
4297 unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
4299 btrfs_double_extent_unlock(src, off, inode, destoff, len);
4302 * Truncate page cache pages so that future reads will see the cloned
4303 * data immediately and not the previous data.
4305 truncate_inode_pages_range(&inode->i_data,
4306 round_down(destoff, PAGE_SIZE),
4307 round_up(destoff + len, PAGE_SIZE) - 1);
4310 btrfs_double_inode_unlock(src, inode);
4316 int btrfs_clone_file_range(struct file *src_file, loff_t off,
4317 struct file *dst_file, loff_t destoff, u64 len)
4319 return btrfs_clone_files(dst_file, src_file, off, len, destoff);
4322 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
4324 struct inode *inode = file_inode(file);
4325 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4326 struct btrfs_root *root = BTRFS_I(inode)->root;
4327 struct btrfs_root *new_root;
4328 struct btrfs_dir_item *di;
4329 struct btrfs_trans_handle *trans;
4330 struct btrfs_path *path;
4331 struct btrfs_key location;
4332 struct btrfs_disk_key disk_key;
4337 if (!capable(CAP_SYS_ADMIN))
4340 ret = mnt_want_write_file(file);
4344 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
4350 objectid = BTRFS_FS_TREE_OBJECTID;
4352 location.objectid = objectid;
4353 location.type = BTRFS_ROOT_ITEM_KEY;
4354 location.offset = (u64)-1;
4356 new_root = btrfs_read_fs_root_no_name(fs_info, &location);
4357 if (IS_ERR(new_root)) {
4358 ret = PTR_ERR(new_root);
4361 if (!is_fstree(new_root->objectid)) {
4366 path = btrfs_alloc_path();
4371 path->leave_spinning = 1;
4373 trans = btrfs_start_transaction(root, 1);
4374 if (IS_ERR(trans)) {
4375 btrfs_free_path(path);
4376 ret = PTR_ERR(trans);
4380 dir_id = btrfs_super_root_dir(fs_info->super_copy);
4381 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
4382 dir_id, "default", 7, 1);
4383 if (IS_ERR_OR_NULL(di)) {
4384 btrfs_free_path(path);
4385 btrfs_end_transaction(trans);
4387 "Umm, you don't have the default diritem, this isn't going to work");
4392 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4393 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4394 btrfs_mark_buffer_dirty(path->nodes[0]);
4395 btrfs_free_path(path);
4397 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
4398 btrfs_end_transaction(trans);
4400 mnt_drop_write_file(file);
4404 static void get_block_group_info(struct list_head *groups_list,
4405 struct btrfs_ioctl_space_info *space)
4407 struct btrfs_block_group_cache *block_group;
4409 space->total_bytes = 0;
4410 space->used_bytes = 0;
4412 list_for_each_entry(block_group, groups_list, list) {
4413 space->flags = block_group->flags;
4414 space->total_bytes += block_group->key.offset;
4415 space->used_bytes +=
4416 btrfs_block_group_used(&block_group->item);
4420 static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
4423 struct btrfs_ioctl_space_args space_args;
4424 struct btrfs_ioctl_space_info space;
4425 struct btrfs_ioctl_space_info *dest;
4426 struct btrfs_ioctl_space_info *dest_orig;
4427 struct btrfs_ioctl_space_info __user *user_dest;
4428 struct btrfs_space_info *info;
4429 static const u64 types[] = {
4430 BTRFS_BLOCK_GROUP_DATA,
4431 BTRFS_BLOCK_GROUP_SYSTEM,
4432 BTRFS_BLOCK_GROUP_METADATA,
4433 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
4441 if (copy_from_user(&space_args,
4442 (struct btrfs_ioctl_space_args __user *)arg,
4443 sizeof(space_args)))
4446 for (i = 0; i < num_types; i++) {
4447 struct btrfs_space_info *tmp;
4451 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4453 if (tmp->flags == types[i]) {
4463 down_read(&info->groups_sem);
4464 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4465 if (!list_empty(&info->block_groups[c]))
4468 up_read(&info->groups_sem);
4472 * Global block reserve, exported as a space_info
4476 /* space_slots == 0 means they are asking for a count */
4477 if (space_args.space_slots == 0) {
4478 space_args.total_spaces = slot_count;
4482 slot_count = min_t(u64, space_args.space_slots, slot_count);
4484 alloc_size = sizeof(*dest) * slot_count;
4486 /* we generally have at most 6 or so space infos, one for each raid
4487 * level. So, a whole page should be more than enough for everyone
4489 if (alloc_size > PAGE_SIZE)
4492 space_args.total_spaces = 0;
4493 dest = kmalloc(alloc_size, GFP_KERNEL);
4498 /* now we have a buffer to copy into */
4499 for (i = 0; i < num_types; i++) {
4500 struct btrfs_space_info *tmp;
4507 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4509 if (tmp->flags == types[i]) {
4518 down_read(&info->groups_sem);
4519 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4520 if (!list_empty(&info->block_groups[c])) {
4521 get_block_group_info(&info->block_groups[c],
4523 memcpy(dest, &space, sizeof(space));
4525 space_args.total_spaces++;
4531 up_read(&info->groups_sem);
4535 * Add global block reserve
4538 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
4540 spin_lock(&block_rsv->lock);
4541 space.total_bytes = block_rsv->size;
4542 space.used_bytes = block_rsv->size - block_rsv->reserved;
4543 spin_unlock(&block_rsv->lock);
4544 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4545 memcpy(dest, &space, sizeof(space));
4546 space_args.total_spaces++;
4549 user_dest = (struct btrfs_ioctl_space_info __user *)
4550 (arg + sizeof(struct btrfs_ioctl_space_args));
4552 if (copy_to_user(user_dest, dest_orig, alloc_size))
4557 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
4563 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4566 struct btrfs_trans_handle *trans;
4570 trans = btrfs_attach_transaction_barrier(root);
4571 if (IS_ERR(trans)) {
4572 if (PTR_ERR(trans) != -ENOENT)
4573 return PTR_ERR(trans);
4575 /* No running transaction, don't bother */
4576 transid = root->fs_info->last_trans_committed;
4579 transid = trans->transid;
4580 ret = btrfs_commit_transaction_async(trans, 0);
4582 btrfs_end_transaction(trans);
4587 if (copy_to_user(argp, &transid, sizeof(transid)))
4592 static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
4598 if (copy_from_user(&transid, argp, sizeof(transid)))
4601 transid = 0; /* current trans */
4603 return btrfs_wait_for_commit(fs_info, transid);
4606 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4608 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
4609 struct btrfs_ioctl_scrub_args *sa;
4612 if (!capable(CAP_SYS_ADMIN))
4615 sa = memdup_user(arg, sizeof(*sa));
4619 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4620 ret = mnt_want_write_file(file);
4625 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
4626 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4629 if (copy_to_user(arg, sa, sizeof(*sa)))
4632 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4633 mnt_drop_write_file(file);
4639 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
4641 if (!capable(CAP_SYS_ADMIN))
4644 return btrfs_scrub_cancel(fs_info);
4647 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
4650 struct btrfs_ioctl_scrub_args *sa;
4653 if (!capable(CAP_SYS_ADMIN))
4656 sa = memdup_user(arg, sizeof(*sa));
4660 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
4662 if (copy_to_user(arg, sa, sizeof(*sa)))
4669 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
4672 struct btrfs_ioctl_get_dev_stats *sa;
4675 sa = memdup_user(arg, sizeof(*sa));
4679 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4684 ret = btrfs_get_dev_stats(fs_info, sa);
4686 if (copy_to_user(arg, sa, sizeof(*sa)))
4693 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
4696 struct btrfs_ioctl_dev_replace_args *p;
4699 if (!capable(CAP_SYS_ADMIN))
4702 p = memdup_user(arg, sizeof(*p));
4707 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4708 if (sb_rdonly(fs_info->sb)) {
4712 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4713 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4715 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
4716 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
4719 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4720 btrfs_dev_replace_status(fs_info, p);
4723 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4724 p->result = btrfs_dev_replace_cancel(fs_info);
4732 if (copy_to_user(arg, p, sizeof(*p)))
4739 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4745 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4746 struct inode_fs_paths *ipath = NULL;
4747 struct btrfs_path *path;
4749 if (!capable(CAP_DAC_READ_SEARCH))
4752 path = btrfs_alloc_path();
4758 ipa = memdup_user(arg, sizeof(*ipa));
4765 size = min_t(u32, ipa->size, 4096);
4766 ipath = init_ipath(size, root, path);
4767 if (IS_ERR(ipath)) {
4768 ret = PTR_ERR(ipath);
4773 ret = paths_from_inode(ipa->inum, ipath);
4777 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4778 rel_ptr = ipath->fspath->val[i] -
4779 (u64)(unsigned long)ipath->fspath->val;
4780 ipath->fspath->val[i] = rel_ptr;
4783 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
4784 ipath->fspath, size);
4791 btrfs_free_path(path);
4798 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4800 struct btrfs_data_container *inodes = ctx;
4801 const size_t c = 3 * sizeof(u64);
4803 if (inodes->bytes_left >= c) {
4804 inodes->bytes_left -= c;
4805 inodes->val[inodes->elem_cnt] = inum;
4806 inodes->val[inodes->elem_cnt + 1] = offset;
4807 inodes->val[inodes->elem_cnt + 2] = root;
4808 inodes->elem_cnt += 3;
4810 inodes->bytes_missing += c - inodes->bytes_left;
4811 inodes->bytes_left = 0;
4812 inodes->elem_missed += 3;
4818 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
4819 void __user *arg, int version)
4823 struct btrfs_ioctl_logical_ino_args *loi;
4824 struct btrfs_data_container *inodes = NULL;
4825 struct btrfs_path *path = NULL;
4828 if (!capable(CAP_SYS_ADMIN))
4831 loi = memdup_user(arg, sizeof(*loi));
4833 return PTR_ERR(loi);
4836 ignore_offset = false;
4837 size = min_t(u32, loi->size, SZ_64K);
4839 /* All reserved bits must be 0 for now */
4840 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
4844 /* Only accept flags we have defined so far */
4845 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
4849 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
4850 size = min_t(u32, loi->size, SZ_16M);
4853 path = btrfs_alloc_path();
4859 inodes = init_data_container(size);
4860 if (IS_ERR(inodes)) {
4861 ret = PTR_ERR(inodes);
4866 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
4867 build_ino_list, inodes, ignore_offset);
4873 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
4879 btrfs_free_path(path);
4887 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
4888 struct btrfs_ioctl_balance_args *bargs)
4890 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4892 bargs->flags = bctl->flags;
4894 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
4895 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4896 if (atomic_read(&fs_info->balance_pause_req))
4897 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4898 if (atomic_read(&fs_info->balance_cancel_req))
4899 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4901 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4902 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4903 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4905 spin_lock(&fs_info->balance_lock);
4906 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4907 spin_unlock(&fs_info->balance_lock);
4910 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4912 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4913 struct btrfs_fs_info *fs_info = root->fs_info;
4914 struct btrfs_ioctl_balance_args *bargs;
4915 struct btrfs_balance_control *bctl;
4916 bool need_unlock; /* for mut. excl. ops lock */
4919 if (!capable(CAP_SYS_ADMIN))
4922 ret = mnt_want_write_file(file);
4927 if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4928 mutex_lock(&fs_info->balance_mutex);
4934 * mut. excl. ops lock is locked. Three possibilities:
4935 * (1) some other op is running
4936 * (2) balance is running
4937 * (3) balance is paused -- special case (think resume)
4939 mutex_lock(&fs_info->balance_mutex);
4940 if (fs_info->balance_ctl) {
4941 /* this is either (2) or (3) */
4942 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4943 mutex_unlock(&fs_info->balance_mutex);
4945 * Lock released to allow other waiters to continue,
4946 * we'll reexamine the status again.
4948 mutex_lock(&fs_info->balance_mutex);
4950 if (fs_info->balance_ctl &&
4951 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4953 need_unlock = false;
4957 mutex_unlock(&fs_info->balance_mutex);
4961 mutex_unlock(&fs_info->balance_mutex);
4967 mutex_unlock(&fs_info->balance_mutex);
4968 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4973 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags));
4976 bargs = memdup_user(arg, sizeof(*bargs));
4977 if (IS_ERR(bargs)) {
4978 ret = PTR_ERR(bargs);
4982 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4983 if (!fs_info->balance_ctl) {
4988 bctl = fs_info->balance_ctl;
4989 spin_lock(&fs_info->balance_lock);
4990 bctl->flags |= BTRFS_BALANCE_RESUME;
4991 spin_unlock(&fs_info->balance_lock);
4999 if (fs_info->balance_ctl) {
5004 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
5011 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
5012 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
5013 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
5015 bctl->flags = bargs->flags;
5017 /* balance everything - no filters */
5018 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
5021 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
5028 * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
5029 * btrfs_balance. bctl is freed in reset_balance_state, or, if
5030 * restriper was paused all the way until unmount, in free_fs_info.
5031 * The flag should be cleared after reset_balance_state.
5033 need_unlock = false;
5035 ret = btrfs_balance(fs_info, bctl, bargs);
5039 if (copy_to_user(arg, bargs, sizeof(*bargs)))
5048 mutex_unlock(&fs_info->balance_mutex);
5050 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
5052 mnt_drop_write_file(file);
5056 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
5058 if (!capable(CAP_SYS_ADMIN))
5062 case BTRFS_BALANCE_CTL_PAUSE:
5063 return btrfs_pause_balance(fs_info);
5064 case BTRFS_BALANCE_CTL_CANCEL:
5065 return btrfs_cancel_balance(fs_info);
5071 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
5074 struct btrfs_ioctl_balance_args *bargs;
5077 if (!capable(CAP_SYS_ADMIN))
5080 mutex_lock(&fs_info->balance_mutex);
5081 if (!fs_info->balance_ctl) {
5086 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
5092 btrfs_update_ioctl_balance_args(fs_info, bargs);
5094 if (copy_to_user(arg, bargs, sizeof(*bargs)))
5099 mutex_unlock(&fs_info->balance_mutex);
5103 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5105 struct inode *inode = file_inode(file);
5106 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5107 struct btrfs_ioctl_quota_ctl_args *sa;
5110 if (!capable(CAP_SYS_ADMIN))
5113 ret = mnt_want_write_file(file);
5117 sa = memdup_user(arg, sizeof(*sa));
5123 down_write(&fs_info->subvol_sem);
5126 case BTRFS_QUOTA_CTL_ENABLE:
5127 ret = btrfs_quota_enable(fs_info);
5129 case BTRFS_QUOTA_CTL_DISABLE:
5130 ret = btrfs_quota_disable(fs_info);
5138 up_write(&fs_info->subvol_sem);
5140 mnt_drop_write_file(file);
5144 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5146 struct inode *inode = file_inode(file);
5147 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5148 struct btrfs_root *root = BTRFS_I(inode)->root;
5149 struct btrfs_ioctl_qgroup_assign_args *sa;
5150 struct btrfs_trans_handle *trans;
5154 if (!capable(CAP_SYS_ADMIN))
5157 ret = mnt_want_write_file(file);
5161 sa = memdup_user(arg, sizeof(*sa));
5167 trans = btrfs_join_transaction(root);
5168 if (IS_ERR(trans)) {
5169 ret = PTR_ERR(trans);
5174 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
5176 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
5179 /* update qgroup status and info */
5180 err = btrfs_run_qgroups(trans);
5182 btrfs_handle_fs_error(fs_info, err,
5183 "failed to update qgroup status and info");
5184 err = btrfs_end_transaction(trans);
5191 mnt_drop_write_file(file);
5195 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5197 struct inode *inode = file_inode(file);
5198 struct btrfs_root *root = BTRFS_I(inode)->root;
5199 struct btrfs_ioctl_qgroup_create_args *sa;
5200 struct btrfs_trans_handle *trans;
5204 if (!capable(CAP_SYS_ADMIN))
5207 ret = mnt_want_write_file(file);
5211 sa = memdup_user(arg, sizeof(*sa));
5217 if (!sa->qgroupid) {
5222 trans = btrfs_join_transaction(root);
5223 if (IS_ERR(trans)) {
5224 ret = PTR_ERR(trans);
5229 ret = btrfs_create_qgroup(trans, sa->qgroupid);
5231 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
5234 err = btrfs_end_transaction(trans);
5241 mnt_drop_write_file(file);
5245 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5247 struct inode *inode = file_inode(file);
5248 struct btrfs_root *root = BTRFS_I(inode)->root;
5249 struct btrfs_ioctl_qgroup_limit_args *sa;
5250 struct btrfs_trans_handle *trans;
5255 if (!capable(CAP_SYS_ADMIN))
5258 ret = mnt_want_write_file(file);
5262 sa = memdup_user(arg, sizeof(*sa));
5268 trans = btrfs_join_transaction(root);
5269 if (IS_ERR(trans)) {
5270 ret = PTR_ERR(trans);
5274 qgroupid = sa->qgroupid;
5276 /* take the current subvol as qgroup */
5277 qgroupid = root->root_key.objectid;
5280 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
5282 err = btrfs_end_transaction(trans);
5289 mnt_drop_write_file(file);
5293 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
5295 struct inode *inode = file_inode(file);
5296 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5297 struct btrfs_ioctl_quota_rescan_args *qsa;
5300 if (!capable(CAP_SYS_ADMIN))
5303 ret = mnt_want_write_file(file);
5307 qsa = memdup_user(arg, sizeof(*qsa));
5318 ret = btrfs_qgroup_rescan(fs_info);
5323 mnt_drop_write_file(file);
5327 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
5329 struct inode *inode = file_inode(file);
5330 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5331 struct btrfs_ioctl_quota_rescan_args *qsa;
5334 if (!capable(CAP_SYS_ADMIN))
5337 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
5341 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
5343 qsa->progress = fs_info->qgroup_rescan_progress.objectid;
5346 if (copy_to_user(arg, qsa, sizeof(*qsa)))
5353 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
5355 struct inode *inode = file_inode(file);
5356 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5358 if (!capable(CAP_SYS_ADMIN))
5361 return btrfs_qgroup_wait_for_completion(fs_info, true);
5364 static long _btrfs_ioctl_set_received_subvol(struct file *file,
5365 struct btrfs_ioctl_received_subvol_args *sa)
5367 struct inode *inode = file_inode(file);
5368 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5369 struct btrfs_root *root = BTRFS_I(inode)->root;
5370 struct btrfs_root_item *root_item = &root->root_item;
5371 struct btrfs_trans_handle *trans;
5372 struct timespec64 ct = current_time(inode);
5374 int received_uuid_changed;
5376 if (!inode_owner_or_capable(inode))
5379 ret = mnt_want_write_file(file);
5383 down_write(&fs_info->subvol_sem);
5385 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
5390 if (btrfs_root_readonly(root)) {
5397 * 2 - uuid items (received uuid + subvol uuid)
5399 trans = btrfs_start_transaction(root, 3);
5400 if (IS_ERR(trans)) {
5401 ret = PTR_ERR(trans);
5406 sa->rtransid = trans->transid;
5407 sa->rtime.sec = ct.tv_sec;
5408 sa->rtime.nsec = ct.tv_nsec;
5410 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5412 if (received_uuid_changed &&
5413 !btrfs_is_empty_uuid(root_item->received_uuid)) {
5414 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
5415 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5416 root->root_key.objectid);
5417 if (ret && ret != -ENOENT) {
5418 btrfs_abort_transaction(trans, ret);
5419 btrfs_end_transaction(trans);
5423 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5424 btrfs_set_root_stransid(root_item, sa->stransid);
5425 btrfs_set_root_rtransid(root_item, sa->rtransid);
5426 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5427 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5428 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5429 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
5431 ret = btrfs_update_root(trans, fs_info->tree_root,
5432 &root->root_key, &root->root_item);
5434 btrfs_end_transaction(trans);
5437 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
5438 ret = btrfs_uuid_tree_add(trans, sa->uuid,
5439 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5440 root->root_key.objectid);
5441 if (ret < 0 && ret != -EEXIST) {
5442 btrfs_abort_transaction(trans, ret);
5443 btrfs_end_transaction(trans);
5447 ret = btrfs_commit_transaction(trans);
5449 up_write(&fs_info->subvol_sem);
5450 mnt_drop_write_file(file);
5455 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5458 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5459 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5462 args32 = memdup_user(arg, sizeof(*args32));
5464 return PTR_ERR(args32);
5466 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5472 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5473 args64->stransid = args32->stransid;
5474 args64->rtransid = args32->rtransid;
5475 args64->stime.sec = args32->stime.sec;
5476 args64->stime.nsec = args32->stime.nsec;
5477 args64->rtime.sec = args32->rtime.sec;
5478 args64->rtime.nsec = args32->rtime.nsec;
5479 args64->flags = args32->flags;
5481 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5485 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5486 args32->stransid = args64->stransid;
5487 args32->rtransid = args64->rtransid;
5488 args32->stime.sec = args64->stime.sec;
5489 args32->stime.nsec = args64->stime.nsec;
5490 args32->rtime.sec = args64->rtime.sec;
5491 args32->rtime.nsec = args64->rtime.nsec;
5492 args32->flags = args64->flags;
5494 ret = copy_to_user(arg, args32, sizeof(*args32));
5505 static long btrfs_ioctl_set_received_subvol(struct file *file,
5508 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5511 sa = memdup_user(arg, sizeof(*sa));
5515 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5520 ret = copy_to_user(arg, sa, sizeof(*sa));
5529 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5531 struct inode *inode = file_inode(file);
5532 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5535 char label[BTRFS_LABEL_SIZE];
5537 spin_lock(&fs_info->super_lock);
5538 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5539 spin_unlock(&fs_info->super_lock);
5541 len = strnlen(label, BTRFS_LABEL_SIZE);
5543 if (len == BTRFS_LABEL_SIZE) {
5545 "label is too long, return the first %zu bytes",
5549 ret = copy_to_user(arg, label, len);
5551 return ret ? -EFAULT : 0;
5554 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5556 struct inode *inode = file_inode(file);
5557 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5558 struct btrfs_root *root = BTRFS_I(inode)->root;
5559 struct btrfs_super_block *super_block = fs_info->super_copy;
5560 struct btrfs_trans_handle *trans;
5561 char label[BTRFS_LABEL_SIZE];
5564 if (!capable(CAP_SYS_ADMIN))
5567 if (copy_from_user(label, arg, sizeof(label)))
5570 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5572 "unable to set label with more than %d bytes",
5573 BTRFS_LABEL_SIZE - 1);
5577 ret = mnt_want_write_file(file);
5581 trans = btrfs_start_transaction(root, 0);
5582 if (IS_ERR(trans)) {
5583 ret = PTR_ERR(trans);
5587 spin_lock(&fs_info->super_lock);
5588 strcpy(super_block->label, label);
5589 spin_unlock(&fs_info->super_lock);
5590 ret = btrfs_commit_transaction(trans);
5593 mnt_drop_write_file(file);
5597 #define INIT_FEATURE_FLAGS(suffix) \
5598 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5599 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5600 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5602 int btrfs_ioctl_get_supported_features(void __user *arg)
5604 static const struct btrfs_ioctl_feature_flags features[3] = {
5605 INIT_FEATURE_FLAGS(SUPP),
5606 INIT_FEATURE_FLAGS(SAFE_SET),
5607 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5610 if (copy_to_user(arg, &features, sizeof(features)))
5616 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5618 struct inode *inode = file_inode(file);
5619 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5620 struct btrfs_super_block *super_block = fs_info->super_copy;
5621 struct btrfs_ioctl_feature_flags features;
5623 features.compat_flags = btrfs_super_compat_flags(super_block);
5624 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5625 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5627 if (copy_to_user(arg, &features, sizeof(features)))
5633 static int check_feature_bits(struct btrfs_fs_info *fs_info,
5634 enum btrfs_feature_set set,
5635 u64 change_mask, u64 flags, u64 supported_flags,
5636 u64 safe_set, u64 safe_clear)
5638 const char *type = btrfs_feature_set_names[set];
5640 u64 disallowed, unsupported;
5641 u64 set_mask = flags & change_mask;
5642 u64 clear_mask = ~flags & change_mask;
5644 unsupported = set_mask & ~supported_flags;
5646 names = btrfs_printable_features(set, unsupported);
5649 "this kernel does not support the %s feature bit%s",
5650 names, strchr(names, ',') ? "s" : "");
5654 "this kernel does not support %s bits 0x%llx",
5659 disallowed = set_mask & ~safe_set;
5661 names = btrfs_printable_features(set, disallowed);
5664 "can't set the %s feature bit%s while mounted",
5665 names, strchr(names, ',') ? "s" : "");
5669 "can't set %s bits 0x%llx while mounted",
5674 disallowed = clear_mask & ~safe_clear;
5676 names = btrfs_printable_features(set, disallowed);
5679 "can't clear the %s feature bit%s while mounted",
5680 names, strchr(names, ',') ? "s" : "");
5684 "can't clear %s bits 0x%llx while mounted",
5692 #define check_feature(fs_info, change_mask, flags, mask_base) \
5693 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
5694 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5695 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5696 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5698 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5700 struct inode *inode = file_inode(file);
5701 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5702 struct btrfs_root *root = BTRFS_I(inode)->root;
5703 struct btrfs_super_block *super_block = fs_info->super_copy;
5704 struct btrfs_ioctl_feature_flags flags[2];
5705 struct btrfs_trans_handle *trans;
5709 if (!capable(CAP_SYS_ADMIN))
5712 if (copy_from_user(flags, arg, sizeof(flags)))
5716 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5717 !flags[0].incompat_flags)
5720 ret = check_feature(fs_info, flags[0].compat_flags,
5721 flags[1].compat_flags, COMPAT);
5725 ret = check_feature(fs_info, flags[0].compat_ro_flags,
5726 flags[1].compat_ro_flags, COMPAT_RO);
5730 ret = check_feature(fs_info, flags[0].incompat_flags,
5731 flags[1].incompat_flags, INCOMPAT);
5735 ret = mnt_want_write_file(file);
5739 trans = btrfs_start_transaction(root, 0);
5740 if (IS_ERR(trans)) {
5741 ret = PTR_ERR(trans);
5742 goto out_drop_write;
5745 spin_lock(&fs_info->super_lock);
5746 newflags = btrfs_super_compat_flags(super_block);
5747 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5748 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5749 btrfs_set_super_compat_flags(super_block, newflags);
5751 newflags = btrfs_super_compat_ro_flags(super_block);
5752 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5753 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5754 btrfs_set_super_compat_ro_flags(super_block, newflags);
5756 newflags = btrfs_super_incompat_flags(super_block);
5757 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5758 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5759 btrfs_set_super_incompat_flags(super_block, newflags);
5760 spin_unlock(&fs_info->super_lock);
5762 ret = btrfs_commit_transaction(trans);
5764 mnt_drop_write_file(file);
5769 static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
5771 struct btrfs_ioctl_send_args *arg;
5775 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5776 struct btrfs_ioctl_send_args_32 args32;
5778 ret = copy_from_user(&args32, argp, sizeof(args32));
5781 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
5784 arg->send_fd = args32.send_fd;
5785 arg->clone_sources_count = args32.clone_sources_count;
5786 arg->clone_sources = compat_ptr(args32.clone_sources);
5787 arg->parent_root = args32.parent_root;
5788 arg->flags = args32.flags;
5789 memcpy(arg->reserved, args32.reserved,
5790 sizeof(args32.reserved));
5795 arg = memdup_user(argp, sizeof(*arg));
5797 return PTR_ERR(arg);
5799 ret = btrfs_ioctl_send(file, arg);
5804 long btrfs_ioctl(struct file *file, unsigned int
5805 cmd, unsigned long arg)
5807 struct inode *inode = file_inode(file);
5808 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5809 struct btrfs_root *root = BTRFS_I(inode)->root;
5810 void __user *argp = (void __user *)arg;
5813 case FS_IOC_GETFLAGS:
5814 return btrfs_ioctl_getflags(file, argp);
5815 case FS_IOC_SETFLAGS:
5816 return btrfs_ioctl_setflags(file, argp);
5817 case FS_IOC_GETVERSION:
5818 return btrfs_ioctl_getversion(file, argp);
5820 return btrfs_ioctl_fitrim(file, argp);
5821 case BTRFS_IOC_SNAP_CREATE:
5822 return btrfs_ioctl_snap_create(file, argp, 0);
5823 case BTRFS_IOC_SNAP_CREATE_V2:
5824 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5825 case BTRFS_IOC_SUBVOL_CREATE:
5826 return btrfs_ioctl_snap_create(file, argp, 1);
5827 case BTRFS_IOC_SUBVOL_CREATE_V2:
5828 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5829 case BTRFS_IOC_SNAP_DESTROY:
5830 return btrfs_ioctl_snap_destroy(file, argp);
5831 case BTRFS_IOC_SUBVOL_GETFLAGS:
5832 return btrfs_ioctl_subvol_getflags(file, argp);
5833 case BTRFS_IOC_SUBVOL_SETFLAGS:
5834 return btrfs_ioctl_subvol_setflags(file, argp);
5835 case BTRFS_IOC_DEFAULT_SUBVOL:
5836 return btrfs_ioctl_default_subvol(file, argp);
5837 case BTRFS_IOC_DEFRAG:
5838 return btrfs_ioctl_defrag(file, NULL);
5839 case BTRFS_IOC_DEFRAG_RANGE:
5840 return btrfs_ioctl_defrag(file, argp);
5841 case BTRFS_IOC_RESIZE:
5842 return btrfs_ioctl_resize(file, argp);
5843 case BTRFS_IOC_ADD_DEV:
5844 return btrfs_ioctl_add_dev(fs_info, argp);
5845 case BTRFS_IOC_RM_DEV:
5846 return btrfs_ioctl_rm_dev(file, argp);
5847 case BTRFS_IOC_RM_DEV_V2:
5848 return btrfs_ioctl_rm_dev_v2(file, argp);
5849 case BTRFS_IOC_FS_INFO:
5850 return btrfs_ioctl_fs_info(fs_info, argp);
5851 case BTRFS_IOC_DEV_INFO:
5852 return btrfs_ioctl_dev_info(fs_info, argp);
5853 case BTRFS_IOC_BALANCE:
5854 return btrfs_ioctl_balance(file, NULL);
5855 case BTRFS_IOC_TREE_SEARCH:
5856 return btrfs_ioctl_tree_search(file, argp);
5857 case BTRFS_IOC_TREE_SEARCH_V2:
5858 return btrfs_ioctl_tree_search_v2(file, argp);
5859 case BTRFS_IOC_INO_LOOKUP:
5860 return btrfs_ioctl_ino_lookup(file, argp);
5861 case BTRFS_IOC_INO_PATHS:
5862 return btrfs_ioctl_ino_to_path(root, argp);
5863 case BTRFS_IOC_LOGICAL_INO:
5864 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5865 case BTRFS_IOC_LOGICAL_INO_V2:
5866 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
5867 case BTRFS_IOC_SPACE_INFO:
5868 return btrfs_ioctl_space_info(fs_info, argp);
5869 case BTRFS_IOC_SYNC: {
5872 ret = btrfs_start_delalloc_roots(fs_info, -1);
5875 ret = btrfs_sync_fs(inode->i_sb, 1);
5877 * The transaction thread may want to do more work,
5878 * namely it pokes the cleaner kthread that will start
5879 * processing uncleaned subvols.
5881 wake_up_process(fs_info->transaction_kthread);
5884 case BTRFS_IOC_START_SYNC:
5885 return btrfs_ioctl_start_sync(root, argp);
5886 case BTRFS_IOC_WAIT_SYNC:
5887 return btrfs_ioctl_wait_sync(fs_info, argp);
5888 case BTRFS_IOC_SCRUB:
5889 return btrfs_ioctl_scrub(file, argp);
5890 case BTRFS_IOC_SCRUB_CANCEL:
5891 return btrfs_ioctl_scrub_cancel(fs_info);
5892 case BTRFS_IOC_SCRUB_PROGRESS:
5893 return btrfs_ioctl_scrub_progress(fs_info, argp);
5894 case BTRFS_IOC_BALANCE_V2:
5895 return btrfs_ioctl_balance(file, argp);
5896 case BTRFS_IOC_BALANCE_CTL:
5897 return btrfs_ioctl_balance_ctl(fs_info, arg);
5898 case BTRFS_IOC_BALANCE_PROGRESS:
5899 return btrfs_ioctl_balance_progress(fs_info, argp);
5900 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5901 return btrfs_ioctl_set_received_subvol(file, argp);
5903 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5904 return btrfs_ioctl_set_received_subvol_32(file, argp);
5906 case BTRFS_IOC_SEND:
5907 return _btrfs_ioctl_send(file, argp, false);
5908 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5909 case BTRFS_IOC_SEND_32:
5910 return _btrfs_ioctl_send(file, argp, true);
5912 case BTRFS_IOC_GET_DEV_STATS:
5913 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5914 case BTRFS_IOC_QUOTA_CTL:
5915 return btrfs_ioctl_quota_ctl(file, argp);
5916 case BTRFS_IOC_QGROUP_ASSIGN:
5917 return btrfs_ioctl_qgroup_assign(file, argp);
5918 case BTRFS_IOC_QGROUP_CREATE:
5919 return btrfs_ioctl_qgroup_create(file, argp);
5920 case BTRFS_IOC_QGROUP_LIMIT:
5921 return btrfs_ioctl_qgroup_limit(file, argp);
5922 case BTRFS_IOC_QUOTA_RESCAN:
5923 return btrfs_ioctl_quota_rescan(file, argp);
5924 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5925 return btrfs_ioctl_quota_rescan_status(file, argp);
5926 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5927 return btrfs_ioctl_quota_rescan_wait(file, argp);
5928 case BTRFS_IOC_DEV_REPLACE:
5929 return btrfs_ioctl_dev_replace(fs_info, argp);
5930 case BTRFS_IOC_GET_FSLABEL:
5931 return btrfs_ioctl_get_fslabel(file, argp);
5932 case BTRFS_IOC_SET_FSLABEL:
5933 return btrfs_ioctl_set_fslabel(file, argp);
5934 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5935 return btrfs_ioctl_get_supported_features(argp);
5936 case BTRFS_IOC_GET_FEATURES:
5937 return btrfs_ioctl_get_features(file, argp);
5938 case BTRFS_IOC_SET_FEATURES:
5939 return btrfs_ioctl_set_features(file, argp);
5940 case FS_IOC_FSGETXATTR:
5941 return btrfs_ioctl_fsgetxattr(file, argp);
5942 case FS_IOC_FSSETXATTR:
5943 return btrfs_ioctl_fssetxattr(file, argp);
5944 case BTRFS_IOC_GET_SUBVOL_INFO:
5945 return btrfs_ioctl_get_subvol_info(file, argp);
5946 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5947 return btrfs_ioctl_get_subvol_rootref(file, argp);
5948 case BTRFS_IOC_INO_LOOKUP_USER:
5949 return btrfs_ioctl_ino_lookup_user(file, argp);
5955 #ifdef CONFIG_COMPAT
5956 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5959 * These all access 32-bit values anyway so no further
5960 * handling is necessary.
5963 case FS_IOC32_GETFLAGS:
5964 cmd = FS_IOC_GETFLAGS;
5966 case FS_IOC32_SETFLAGS:
5967 cmd = FS_IOC_SETFLAGS;
5969 case FS_IOC32_GETVERSION:
5970 cmd = FS_IOC_GETVERSION;
5974 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));