1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/kernel.h>
8 #include <linux/buffer_head.h>
9 #include <linux/file.h>
11 #include <linux/fsnotify.h>
12 #include <linux/pagemap.h>
13 #include <linux/highmem.h>
14 #include <linux/time.h>
15 #include <linux/init.h>
16 #include <linux/string.h>
17 #include <linux/backing-dev.h>
18 #include <linux/mount.h>
19 #include <linux/mpage.h>
20 #include <linux/namei.h>
21 #include <linux/swap.h>
22 #include <linux/writeback.h>
23 #include <linux/compat.h>
24 #include <linux/bit_spinlock.h>
25 #include <linux/security.h>
26 #include <linux/xattr.h>
28 #include <linux/slab.h>
29 #include <linux/blkdev.h>
30 #include <linux/uuid.h>
31 #include <linux/btrfs.h>
32 #include <linux/uaccess.h>
33 #include <linux/iversion.h>
36 #include "transaction.h"
37 #include "btrfs_inode.h"
38 #include "print-tree.h"
41 #include "inode-map.h"
43 #include "rcu-string.h"
45 #include "dev-replace.h"
50 #include "compression.h"
53 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
54 * structures are incorrect, as the timespec structure from userspace
55 * is 4 bytes too small. We define these alternatives here to teach
56 * the kernel about the 32-bit struct packing.
58 struct btrfs_ioctl_timespec_32 {
61 } __attribute__ ((__packed__));
63 struct btrfs_ioctl_received_subvol_args_32 {
64 char uuid[BTRFS_UUID_SIZE]; /* in */
65 __u64 stransid; /* in */
66 __u64 rtransid; /* out */
67 struct btrfs_ioctl_timespec_32 stime; /* in */
68 struct btrfs_ioctl_timespec_32 rtime; /* out */
70 __u64 reserved[16]; /* in */
71 } __attribute__ ((__packed__));
73 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
74 struct btrfs_ioctl_received_subvol_args_32)
77 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
78 struct btrfs_ioctl_send_args_32 {
79 __s64 send_fd; /* in */
80 __u64 clone_sources_count; /* in */
81 compat_uptr_t clone_sources; /* in */
82 __u64 parent_root; /* in */
84 __u64 reserved[4]; /* in */
85 } __attribute__ ((__packed__));
87 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
88 struct btrfs_ioctl_send_args_32)
91 static int btrfs_clone(struct inode *src, struct inode *inode,
92 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
95 /* Mask out flags that are inappropriate for the given type of inode. */
96 static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
99 if (S_ISDIR(inode->i_mode))
101 else if (S_ISREG(inode->i_mode))
102 return flags & ~FS_DIRSYNC_FL;
104 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
108 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
111 static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
113 unsigned int iflags = 0;
115 if (flags & BTRFS_INODE_SYNC)
116 iflags |= FS_SYNC_FL;
117 if (flags & BTRFS_INODE_IMMUTABLE)
118 iflags |= FS_IMMUTABLE_FL;
119 if (flags & BTRFS_INODE_APPEND)
120 iflags |= FS_APPEND_FL;
121 if (flags & BTRFS_INODE_NODUMP)
122 iflags |= FS_NODUMP_FL;
123 if (flags & BTRFS_INODE_NOATIME)
124 iflags |= FS_NOATIME_FL;
125 if (flags & BTRFS_INODE_DIRSYNC)
126 iflags |= FS_DIRSYNC_FL;
127 if (flags & BTRFS_INODE_NODATACOW)
128 iflags |= FS_NOCOW_FL;
130 if (flags & BTRFS_INODE_NOCOMPRESS)
131 iflags |= FS_NOCOMP_FL;
132 else if (flags & BTRFS_INODE_COMPRESS)
133 iflags |= FS_COMPR_FL;
139 * Update inode->i_flags based on the btrfs internal flags.
141 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
143 struct btrfs_inode *binode = BTRFS_I(inode);
144 unsigned int new_fl = 0;
146 if (binode->flags & BTRFS_INODE_SYNC)
148 if (binode->flags & BTRFS_INODE_IMMUTABLE)
149 new_fl |= S_IMMUTABLE;
150 if (binode->flags & BTRFS_INODE_APPEND)
152 if (binode->flags & BTRFS_INODE_NOATIME)
154 if (binode->flags & BTRFS_INODE_DIRSYNC)
157 set_mask_bits(&inode->i_flags,
158 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
162 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
164 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
165 unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
167 if (copy_to_user(arg, &flags, sizeof(flags)))
172 /* Check if @flags are a supported and valid set of FS_*_FL flags */
173 static int check_fsflags(unsigned int flags)
175 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
176 FS_NOATIME_FL | FS_NODUMP_FL | \
177 FS_SYNC_FL | FS_DIRSYNC_FL | \
178 FS_NOCOMP_FL | FS_COMPR_FL |
182 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
188 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
190 struct inode *inode = file_inode(file);
191 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
192 struct btrfs_inode *binode = BTRFS_I(inode);
193 struct btrfs_root *root = binode->root;
194 struct btrfs_trans_handle *trans;
195 unsigned int fsflags, old_fsflags;
198 unsigned int old_i_flags;
201 if (!inode_owner_or_capable(inode))
204 if (btrfs_root_readonly(root))
207 if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
210 ret = check_fsflags(fsflags);
214 ret = mnt_want_write_file(file);
220 old_flags = binode->flags;
221 old_i_flags = inode->i_flags;
222 mode = inode->i_mode;
224 fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
225 old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
226 if ((fsflags ^ old_fsflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
227 if (!capable(CAP_LINUX_IMMUTABLE)) {
233 if (fsflags & FS_SYNC_FL)
234 binode->flags |= BTRFS_INODE_SYNC;
236 binode->flags &= ~BTRFS_INODE_SYNC;
237 if (fsflags & FS_IMMUTABLE_FL)
238 binode->flags |= BTRFS_INODE_IMMUTABLE;
240 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
241 if (fsflags & FS_APPEND_FL)
242 binode->flags |= BTRFS_INODE_APPEND;
244 binode->flags &= ~BTRFS_INODE_APPEND;
245 if (fsflags & FS_NODUMP_FL)
246 binode->flags |= BTRFS_INODE_NODUMP;
248 binode->flags &= ~BTRFS_INODE_NODUMP;
249 if (fsflags & FS_NOATIME_FL)
250 binode->flags |= BTRFS_INODE_NOATIME;
252 binode->flags &= ~BTRFS_INODE_NOATIME;
253 if (fsflags & FS_DIRSYNC_FL)
254 binode->flags |= BTRFS_INODE_DIRSYNC;
256 binode->flags &= ~BTRFS_INODE_DIRSYNC;
257 if (fsflags & FS_NOCOW_FL) {
260 * It's safe to turn csums off here, no extents exist.
261 * Otherwise we want the flag to reflect the real COW
262 * status of the file and will not set it.
264 if (inode->i_size == 0)
265 binode->flags |= BTRFS_INODE_NODATACOW
266 | BTRFS_INODE_NODATASUM;
268 binode->flags |= BTRFS_INODE_NODATACOW;
272 * Revert back under same assumptions as above
275 if (inode->i_size == 0)
276 binode->flags &= ~(BTRFS_INODE_NODATACOW
277 | BTRFS_INODE_NODATASUM);
279 binode->flags &= ~BTRFS_INODE_NODATACOW;
284 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
285 * flag may be changed automatically if compression code won't make
288 if (fsflags & FS_NOCOMP_FL) {
289 binode->flags &= ~BTRFS_INODE_COMPRESS;
290 binode->flags |= BTRFS_INODE_NOCOMPRESS;
292 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
293 if (ret && ret != -ENODATA)
295 } else if (fsflags & FS_COMPR_FL) {
298 binode->flags |= BTRFS_INODE_COMPRESS;
299 binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
301 comp = btrfs_compress_type2str(fs_info->compress_type);
302 if (!comp || comp[0] == 0)
303 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
305 ret = btrfs_set_prop(inode, "btrfs.compression",
306 comp, strlen(comp), 0);
311 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
312 if (ret && ret != -ENODATA)
314 binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
317 trans = btrfs_start_transaction(root, 1);
319 ret = PTR_ERR(trans);
323 btrfs_sync_inode_flags_to_i_flags(inode);
324 inode_inc_iversion(inode);
325 inode->i_ctime = current_time(inode);
326 ret = btrfs_update_inode(trans, root, inode);
328 btrfs_end_transaction(trans);
331 binode->flags = old_flags;
332 inode->i_flags = old_i_flags;
337 mnt_drop_write_file(file);
342 * Translate btrfs internal inode flags to xflags as expected by the
343 * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
346 static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
348 unsigned int xflags = 0;
350 if (flags & BTRFS_INODE_APPEND)
351 xflags |= FS_XFLAG_APPEND;
352 if (flags & BTRFS_INODE_IMMUTABLE)
353 xflags |= FS_XFLAG_IMMUTABLE;
354 if (flags & BTRFS_INODE_NOATIME)
355 xflags |= FS_XFLAG_NOATIME;
356 if (flags & BTRFS_INODE_NODUMP)
357 xflags |= FS_XFLAG_NODUMP;
358 if (flags & BTRFS_INODE_SYNC)
359 xflags |= FS_XFLAG_SYNC;
364 /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
365 static int check_xflags(unsigned int flags)
367 if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
368 FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
374 * Set the xflags from the internal inode flags. The remaining items of fsxattr
377 static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
379 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
382 memset(&fa, 0, sizeof(fa));
383 fa.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
385 if (copy_to_user(arg, &fa, sizeof(fa)))
391 static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
393 struct inode *inode = file_inode(file);
394 struct btrfs_inode *binode = BTRFS_I(inode);
395 struct btrfs_root *root = binode->root;
396 struct btrfs_trans_handle *trans;
399 unsigned old_i_flags;
402 if (!inode_owner_or_capable(inode))
405 if (btrfs_root_readonly(root))
408 memset(&fa, 0, sizeof(fa));
409 if (copy_from_user(&fa, arg, sizeof(fa)))
412 ret = check_xflags(fa.fsx_xflags);
416 if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
419 ret = mnt_want_write_file(file);
425 old_flags = binode->flags;
426 old_i_flags = inode->i_flags;
428 /* We need the capabilities to change append-only or immutable inode */
429 if (((old_flags & (BTRFS_INODE_APPEND | BTRFS_INODE_IMMUTABLE)) ||
430 (fa.fsx_xflags & (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE))) &&
431 !capable(CAP_LINUX_IMMUTABLE)) {
436 if (fa.fsx_xflags & FS_XFLAG_SYNC)
437 binode->flags |= BTRFS_INODE_SYNC;
439 binode->flags &= ~BTRFS_INODE_SYNC;
440 if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
441 binode->flags |= BTRFS_INODE_IMMUTABLE;
443 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
444 if (fa.fsx_xflags & FS_XFLAG_APPEND)
445 binode->flags |= BTRFS_INODE_APPEND;
447 binode->flags &= ~BTRFS_INODE_APPEND;
448 if (fa.fsx_xflags & FS_XFLAG_NODUMP)
449 binode->flags |= BTRFS_INODE_NODUMP;
451 binode->flags &= ~BTRFS_INODE_NODUMP;
452 if (fa.fsx_xflags & FS_XFLAG_NOATIME)
453 binode->flags |= BTRFS_INODE_NOATIME;
455 binode->flags &= ~BTRFS_INODE_NOATIME;
457 /* 1 item for the inode */
458 trans = btrfs_start_transaction(root, 1);
460 ret = PTR_ERR(trans);
464 btrfs_sync_inode_flags_to_i_flags(inode);
465 inode_inc_iversion(inode);
466 inode->i_ctime = current_time(inode);
467 ret = btrfs_update_inode(trans, root, inode);
469 btrfs_end_transaction(trans);
473 binode->flags = old_flags;
474 inode->i_flags = old_i_flags;
478 mnt_drop_write_file(file);
483 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
485 struct inode *inode = file_inode(file);
487 return put_user(inode->i_generation, arg);
490 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
492 struct inode *inode = file_inode(file);
493 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
494 struct btrfs_device *device;
495 struct request_queue *q;
496 struct fstrim_range range;
497 u64 minlen = ULLONG_MAX;
499 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
502 if (!capable(CAP_SYS_ADMIN))
506 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
510 q = bdev_get_queue(device->bdev);
511 if (blk_queue_discard(q)) {
513 minlen = min_t(u64, q->limits.discard_granularity,
521 if (copy_from_user(&range, arg, sizeof(range)))
523 if (range.start > total_bytes ||
524 range.len < fs_info->sb->s_blocksize)
527 range.len = min(range.len, total_bytes - range.start);
528 range.minlen = max(range.minlen, minlen);
529 ret = btrfs_trim_fs(fs_info, &range);
533 if (copy_to_user(arg, &range, sizeof(range)))
539 int btrfs_is_empty_uuid(u8 *uuid)
543 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
550 static noinline int create_subvol(struct inode *dir,
551 struct dentry *dentry,
552 const char *name, int namelen,
554 struct btrfs_qgroup_inherit *inherit)
556 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
557 struct btrfs_trans_handle *trans;
558 struct btrfs_key key;
559 struct btrfs_root_item *root_item;
560 struct btrfs_inode_item *inode_item;
561 struct extent_buffer *leaf;
562 struct btrfs_root *root = BTRFS_I(dir)->root;
563 struct btrfs_root *new_root;
564 struct btrfs_block_rsv block_rsv;
565 struct timespec cur_time = current_time(dir);
570 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
574 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
578 ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid);
583 * Don't create subvolume whose level is not zero. Or qgroup will be
584 * screwed up since it assumes subvolume qgroup's level to be 0.
586 if (btrfs_qgroup_level(objectid)) {
591 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
593 * The same as the snapshot creation, please see the comment
594 * of create_snapshot().
596 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
600 trans = btrfs_start_transaction(root, 0);
602 ret = PTR_ERR(trans);
603 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
606 trans->block_rsv = &block_rsv;
607 trans->bytes_reserved = block_rsv.size;
609 ret = btrfs_qgroup_inherit(trans, fs_info, 0, objectid, inherit);
613 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
619 memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
620 btrfs_set_header_bytenr(leaf, leaf->start);
621 btrfs_set_header_generation(leaf, trans->transid);
622 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
623 btrfs_set_header_owner(leaf, objectid);
625 write_extent_buffer_fsid(leaf, fs_info->fsid);
626 write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid);
627 btrfs_mark_buffer_dirty(leaf);
629 inode_item = &root_item->inode;
630 btrfs_set_stack_inode_generation(inode_item, 1);
631 btrfs_set_stack_inode_size(inode_item, 3);
632 btrfs_set_stack_inode_nlink(inode_item, 1);
633 btrfs_set_stack_inode_nbytes(inode_item,
635 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
637 btrfs_set_root_flags(root_item, 0);
638 btrfs_set_root_limit(root_item, 0);
639 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
641 btrfs_set_root_bytenr(root_item, leaf->start);
642 btrfs_set_root_generation(root_item, trans->transid);
643 btrfs_set_root_level(root_item, 0);
644 btrfs_set_root_refs(root_item, 1);
645 btrfs_set_root_used(root_item, leaf->len);
646 btrfs_set_root_last_snapshot(root_item, 0);
648 btrfs_set_root_generation_v2(root_item,
649 btrfs_root_generation(root_item));
650 uuid_le_gen(&new_uuid);
651 memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
652 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
653 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
654 root_item->ctime = root_item->otime;
655 btrfs_set_root_ctransid(root_item, trans->transid);
656 btrfs_set_root_otransid(root_item, trans->transid);
658 btrfs_tree_unlock(leaf);
659 free_extent_buffer(leaf);
662 btrfs_set_root_dirid(root_item, new_dirid);
664 key.objectid = objectid;
666 key.type = BTRFS_ROOT_ITEM_KEY;
667 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
672 key.offset = (u64)-1;
673 new_root = btrfs_read_fs_root_no_name(fs_info, &key);
674 if (IS_ERR(new_root)) {
675 ret = PTR_ERR(new_root);
676 btrfs_abort_transaction(trans, ret);
680 btrfs_record_root_in_trans(trans, new_root);
682 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
684 /* We potentially lose an unused inode item here */
685 btrfs_abort_transaction(trans, ret);
689 mutex_lock(&new_root->objectid_mutex);
690 new_root->highest_objectid = new_dirid;
691 mutex_unlock(&new_root->objectid_mutex);
694 * insert the directory item
696 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
698 btrfs_abort_transaction(trans, ret);
702 ret = btrfs_insert_dir_item(trans, root,
703 name, namelen, BTRFS_I(dir), &key,
704 BTRFS_FT_DIR, index);
706 btrfs_abort_transaction(trans, ret);
710 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
711 ret = btrfs_update_inode(trans, root, dir);
714 ret = btrfs_add_root_ref(trans, fs_info,
715 objectid, root->root_key.objectid,
716 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
719 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
720 BTRFS_UUID_KEY_SUBVOL, objectid);
722 btrfs_abort_transaction(trans, ret);
726 trans->block_rsv = NULL;
727 trans->bytes_reserved = 0;
728 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
731 *async_transid = trans->transid;
732 err = btrfs_commit_transaction_async(trans, 1);
734 err = btrfs_commit_transaction(trans);
736 err = btrfs_commit_transaction(trans);
742 inode = btrfs_lookup_dentry(dir, dentry);
744 return PTR_ERR(inode);
745 d_instantiate(dentry, inode);
754 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
755 struct dentry *dentry,
756 u64 *async_transid, bool readonly,
757 struct btrfs_qgroup_inherit *inherit)
759 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
761 struct btrfs_pending_snapshot *pending_snapshot;
762 struct btrfs_trans_handle *trans;
765 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
768 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
769 if (!pending_snapshot)
772 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
774 pending_snapshot->path = btrfs_alloc_path();
775 if (!pending_snapshot->root_item || !pending_snapshot->path) {
780 atomic_inc(&root->will_be_snapshotted);
781 smp_mb__after_atomic();
782 /* wait for no snapshot writes */
783 wait_event(root->subv_writers->wait,
784 percpu_counter_sum(&root->subv_writers->counter) == 0);
786 ret = btrfs_start_delalloc_inodes(root);
790 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
792 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
793 BTRFS_BLOCK_RSV_TEMP);
795 * 1 - parent dir inode
798 * 2 - root ref/backref
799 * 1 - root of snapshot
802 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
803 &pending_snapshot->block_rsv, 8,
808 pending_snapshot->dentry = dentry;
809 pending_snapshot->root = root;
810 pending_snapshot->readonly = readonly;
811 pending_snapshot->dir = dir;
812 pending_snapshot->inherit = inherit;
814 trans = btrfs_start_transaction(root, 0);
816 ret = PTR_ERR(trans);
820 spin_lock(&fs_info->trans_lock);
821 list_add(&pending_snapshot->list,
822 &trans->transaction->pending_snapshots);
823 spin_unlock(&fs_info->trans_lock);
825 *async_transid = trans->transid;
826 ret = btrfs_commit_transaction_async(trans, 1);
828 ret = btrfs_commit_transaction(trans);
830 ret = btrfs_commit_transaction(trans);
835 ret = pending_snapshot->error;
839 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
843 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
845 ret = PTR_ERR(inode);
849 d_instantiate(dentry, inode);
852 btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
854 if (atomic_dec_and_test(&root->will_be_snapshotted))
855 wake_up_var(&root->will_be_snapshotted);
857 kfree(pending_snapshot->root_item);
858 btrfs_free_path(pending_snapshot->path);
859 kfree(pending_snapshot);
864 /* copy of may_delete in fs/namei.c()
865 * Check whether we can remove a link victim from directory dir, check
866 * whether the type of victim is right.
867 * 1. We can't do it if dir is read-only (done in permission())
868 * 2. We should have write and exec permissions on dir
869 * 3. We can't remove anything from append-only dir
870 * 4. We can't do anything with immutable dir (done in permission())
871 * 5. If the sticky bit on dir is set we should either
872 * a. be owner of dir, or
873 * b. be owner of victim, or
874 * c. have CAP_FOWNER capability
875 * 6. If the victim is append-only or immutable we can't do anything with
876 * links pointing to it.
877 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
878 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
879 * 9. We can't remove a root or mountpoint.
880 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
881 * nfs_async_unlink().
884 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
888 if (d_really_is_negative(victim))
891 BUG_ON(d_inode(victim->d_parent) != dir);
892 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
894 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
899 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
900 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
903 if (!d_is_dir(victim))
907 } else if (d_is_dir(victim))
911 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
916 /* copy of may_create in fs/namei.c() */
917 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
919 if (d_really_is_positive(child))
923 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
927 * Create a new subvolume below @parent. This is largely modeled after
928 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
929 * inside this filesystem so it's quite a bit simpler.
931 static noinline int btrfs_mksubvol(const struct path *parent,
932 const char *name, int namelen,
933 struct btrfs_root *snap_src,
934 u64 *async_transid, bool readonly,
935 struct btrfs_qgroup_inherit *inherit)
937 struct inode *dir = d_inode(parent->dentry);
938 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
939 struct dentry *dentry;
942 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
946 dentry = lookup_one_len(name, parent->dentry, namelen);
947 error = PTR_ERR(dentry);
951 error = btrfs_may_create(dir, dentry);
956 * even if this name doesn't exist, we may get hash collisions.
957 * check for them now when we can safely fail
959 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
965 down_read(&fs_info->subvol_sem);
967 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
971 error = create_snapshot(snap_src, dir, dentry,
972 async_transid, readonly, inherit);
974 error = create_subvol(dir, dentry, name, namelen,
975 async_transid, inherit);
978 fsnotify_mkdir(dir, dentry);
980 up_read(&fs_info->subvol_sem);
989 * When we're defragging a range, we don't want to kick it off again
990 * if it is really just waiting for delalloc to send it down.
991 * If we find a nice big extent or delalloc range for the bytes in the
992 * file you want to defrag, we return 0 to let you know to skip this
995 static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
997 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
998 struct extent_map *em = NULL;
999 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1002 read_lock(&em_tree->lock);
1003 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
1004 read_unlock(&em_tree->lock);
1007 end = extent_map_end(em);
1008 free_extent_map(em);
1009 if (end - offset > thresh)
1012 /* if we already have a nice delalloc here, just stop */
1014 end = count_range_bits(io_tree, &offset, offset + thresh,
1015 thresh, EXTENT_DELALLOC, 1);
1022 * helper function to walk through a file and find extents
1023 * newer than a specific transid, and smaller than thresh.
1025 * This is used by the defragging code to find new and small
1028 static int find_new_extents(struct btrfs_root *root,
1029 struct inode *inode, u64 newer_than,
1030 u64 *off, u32 thresh)
1032 struct btrfs_path *path;
1033 struct btrfs_key min_key;
1034 struct extent_buffer *leaf;
1035 struct btrfs_file_extent_item *extent;
1038 u64 ino = btrfs_ino(BTRFS_I(inode));
1040 path = btrfs_alloc_path();
1044 min_key.objectid = ino;
1045 min_key.type = BTRFS_EXTENT_DATA_KEY;
1046 min_key.offset = *off;
1049 ret = btrfs_search_forward(root, &min_key, path, newer_than);
1053 if (min_key.objectid != ino)
1055 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
1058 leaf = path->nodes[0];
1059 extent = btrfs_item_ptr(leaf, path->slots[0],
1060 struct btrfs_file_extent_item);
1062 type = btrfs_file_extent_type(leaf, extent);
1063 if (type == BTRFS_FILE_EXTENT_REG &&
1064 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
1065 check_defrag_in_cache(inode, min_key.offset, thresh)) {
1066 *off = min_key.offset;
1067 btrfs_free_path(path);
1072 if (path->slots[0] < btrfs_header_nritems(leaf)) {
1073 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
1077 if (min_key.offset == (u64)-1)
1081 btrfs_release_path(path);
1084 btrfs_free_path(path);
1088 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
1090 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1091 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1092 struct extent_map *em;
1093 u64 len = PAGE_SIZE;
1096 * hopefully we have this extent in the tree already, try without
1097 * the full extent lock
1099 read_lock(&em_tree->lock);
1100 em = lookup_extent_mapping(em_tree, start, len);
1101 read_unlock(&em_tree->lock);
1104 struct extent_state *cached = NULL;
1105 u64 end = start + len - 1;
1107 /* get the big lock and read metadata off disk */
1108 lock_extent_bits(io_tree, start, end, &cached);
1109 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
1110 unlock_extent_cached(io_tree, start, end, &cached);
1119 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1121 struct extent_map *next;
1124 /* this is the last extent */
1125 if (em->start + em->len >= i_size_read(inode))
1128 next = defrag_lookup_extent(inode, em->start + em->len);
1129 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1131 else if ((em->block_start + em->block_len == next->block_start) &&
1132 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1135 free_extent_map(next);
1139 static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1140 u64 *last_len, u64 *skip, u64 *defrag_end,
1143 struct extent_map *em;
1145 bool next_mergeable = true;
1146 bool prev_mergeable = true;
1149 * make sure that once we start defragging an extent, we keep on
1152 if (start < *defrag_end)
1157 em = defrag_lookup_extent(inode, start);
1161 /* this will cover holes, and inline extents */
1162 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1168 prev_mergeable = false;
1170 next_mergeable = defrag_check_next_extent(inode, em);
1172 * we hit a real extent, if it is big or the next extent is not a
1173 * real extent, don't bother defragging it
1175 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1176 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1180 * last_len ends up being a counter of how many bytes we've defragged.
1181 * every time we choose not to defrag an extent, we reset *last_len
1182 * so that the next tiny extent will force a defrag.
1184 * The end result of this is that tiny extents before a single big
1185 * extent will force at least part of that big extent to be defragged.
1188 *defrag_end = extent_map_end(em);
1191 *skip = extent_map_end(em);
1195 free_extent_map(em);
1200 * it doesn't do much good to defrag one or two pages
1201 * at a time. This pulls in a nice chunk of pages
1202 * to COW and defrag.
1204 * It also makes sure the delalloc code has enough
1205 * dirty data to avoid making new small extents as part
1208 * It's a good idea to start RA on this range
1209 * before calling this.
1211 static int cluster_pages_for_defrag(struct inode *inode,
1212 struct page **pages,
1213 unsigned long start_index,
1214 unsigned long num_pages)
1216 unsigned long file_end;
1217 u64 isize = i_size_read(inode);
1224 struct btrfs_ordered_extent *ordered;
1225 struct extent_state *cached_state = NULL;
1226 struct extent_io_tree *tree;
1227 struct extent_changeset *data_reserved = NULL;
1228 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1230 file_end = (isize - 1) >> PAGE_SHIFT;
1231 if (!isize || start_index > file_end)
1234 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1236 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
1237 start_index << PAGE_SHIFT,
1238 page_cnt << PAGE_SHIFT);
1242 tree = &BTRFS_I(inode)->io_tree;
1244 /* step one, lock all the pages */
1245 for (i = 0; i < page_cnt; i++) {
1248 page = find_or_create_page(inode->i_mapping,
1249 start_index + i, mask);
1253 page_start = page_offset(page);
1254 page_end = page_start + PAGE_SIZE - 1;
1256 lock_extent_bits(tree, page_start, page_end,
1258 ordered = btrfs_lookup_ordered_extent(inode,
1260 unlock_extent_cached(tree, page_start, page_end,
1266 btrfs_start_ordered_extent(inode, ordered, 1);
1267 btrfs_put_ordered_extent(ordered);
1270 * we unlocked the page above, so we need check if
1271 * it was released or not.
1273 if (page->mapping != inode->i_mapping) {
1280 if (!PageUptodate(page)) {
1281 btrfs_readpage(NULL, page);
1283 if (!PageUptodate(page)) {
1291 if (page->mapping != inode->i_mapping) {
1303 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1307 * so now we have a nice long stream of locked
1308 * and up to date pages, lets wait on them
1310 for (i = 0; i < i_done; i++)
1311 wait_on_page_writeback(pages[i]);
1313 page_start = page_offset(pages[0]);
1314 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
1316 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1317 page_start, page_end - 1, &cached_state);
1318 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1319 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1320 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1323 if (i_done != page_cnt) {
1324 spin_lock(&BTRFS_I(inode)->lock);
1325 BTRFS_I(inode)->outstanding_extents++;
1326 spin_unlock(&BTRFS_I(inode)->lock);
1327 btrfs_delalloc_release_space(inode, data_reserved,
1328 start_index << PAGE_SHIFT,
1329 (page_cnt - i_done) << PAGE_SHIFT, true);
1333 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1336 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1337 page_start, page_end - 1, &cached_state);
1339 for (i = 0; i < i_done; i++) {
1340 clear_page_dirty_for_io(pages[i]);
1341 ClearPageChecked(pages[i]);
1342 set_page_extent_mapped(pages[i]);
1343 set_page_dirty(pages[i]);
1344 unlock_page(pages[i]);
1347 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1349 extent_changeset_free(data_reserved);
1352 for (i = 0; i < i_done; i++) {
1353 unlock_page(pages[i]);
1356 btrfs_delalloc_release_space(inode, data_reserved,
1357 start_index << PAGE_SHIFT,
1358 page_cnt << PAGE_SHIFT, true);
1359 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1361 extent_changeset_free(data_reserved);
1366 int btrfs_defrag_file(struct inode *inode, struct file *file,
1367 struct btrfs_ioctl_defrag_range_args *range,
1368 u64 newer_than, unsigned long max_to_defrag)
1370 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1371 struct btrfs_root *root = BTRFS_I(inode)->root;
1372 struct file_ra_state *ra = NULL;
1373 unsigned long last_index;
1374 u64 isize = i_size_read(inode);
1378 u64 newer_off = range->start;
1380 unsigned long ra_index = 0;
1382 int defrag_count = 0;
1383 int compress_type = BTRFS_COMPRESS_ZLIB;
1384 u32 extent_thresh = range->extent_thresh;
1385 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
1386 unsigned long cluster = max_cluster;
1387 u64 new_align = ~((u64)SZ_128K - 1);
1388 struct page **pages = NULL;
1389 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
1394 if (range->start >= isize)
1398 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1400 if (range->compress_type)
1401 compress_type = range->compress_type;
1404 if (extent_thresh == 0)
1405 extent_thresh = SZ_256K;
1408 * If we were not given a file, allocate a readahead context. As
1409 * readahead is just an optimization, defrag will work without it so
1410 * we don't error out.
1413 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1415 file_ra_state_init(ra, inode->i_mapping);
1420 pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
1426 /* find the last page to defrag */
1427 if (range->start + range->len > range->start) {
1428 last_index = min_t(u64, isize - 1,
1429 range->start + range->len - 1) >> PAGE_SHIFT;
1431 last_index = (isize - 1) >> PAGE_SHIFT;
1435 ret = find_new_extents(root, inode, newer_than,
1436 &newer_off, SZ_64K);
1438 range->start = newer_off;
1440 * we always align our defrag to help keep
1441 * the extents in the file evenly spaced
1443 i = (newer_off & new_align) >> PAGE_SHIFT;
1447 i = range->start >> PAGE_SHIFT;
1450 max_to_defrag = last_index - i + 1;
1453 * make writeback starts from i, so the defrag range can be
1454 * written sequentially.
1456 if (i < inode->i_mapping->writeback_index)
1457 inode->i_mapping->writeback_index = i;
1459 while (i <= last_index && defrag_count < max_to_defrag &&
1460 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
1462 * make sure we stop running if someone unmounts
1465 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1468 if (btrfs_defrag_cancelled(fs_info)) {
1469 btrfs_debug(fs_info, "defrag_file cancelled");
1474 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
1475 extent_thresh, &last_len, &skip,
1476 &defrag_end, do_compress)){
1479 * the should_defrag function tells us how much to skip
1480 * bump our counter by the suggested amount
1482 next = DIV_ROUND_UP(skip, PAGE_SIZE);
1483 i = max(i + 1, next);
1488 cluster = (PAGE_ALIGN(defrag_end) >>
1490 cluster = min(cluster, max_cluster);
1492 cluster = max_cluster;
1495 if (i + cluster > ra_index) {
1496 ra_index = max(i, ra_index);
1498 page_cache_sync_readahead(inode->i_mapping, ra,
1499 file, ra_index, cluster);
1500 ra_index += cluster;
1505 BTRFS_I(inode)->defrag_compress = compress_type;
1506 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1508 inode_unlock(inode);
1512 defrag_count += ret;
1513 balance_dirty_pages_ratelimited(inode->i_mapping);
1514 inode_unlock(inode);
1517 if (newer_off == (u64)-1)
1523 newer_off = max(newer_off + 1,
1524 (u64)i << PAGE_SHIFT);
1526 ret = find_new_extents(root, inode, newer_than,
1527 &newer_off, SZ_64K);
1529 range->start = newer_off;
1530 i = (newer_off & new_align) >> PAGE_SHIFT;
1537 last_len += ret << PAGE_SHIFT;
1545 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1546 filemap_flush(inode->i_mapping);
1547 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1548 &BTRFS_I(inode)->runtime_flags))
1549 filemap_flush(inode->i_mapping);
1552 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1553 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1554 } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
1555 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1563 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
1564 inode_unlock(inode);
1572 static noinline int btrfs_ioctl_resize(struct file *file,
1575 struct inode *inode = file_inode(file);
1576 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1580 struct btrfs_root *root = BTRFS_I(inode)->root;
1581 struct btrfs_ioctl_vol_args *vol_args;
1582 struct btrfs_trans_handle *trans;
1583 struct btrfs_device *device = NULL;
1586 char *devstr = NULL;
1590 if (!capable(CAP_SYS_ADMIN))
1593 ret = mnt_want_write_file(file);
1597 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
1598 mnt_drop_write_file(file);
1599 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1602 vol_args = memdup_user(arg, sizeof(*vol_args));
1603 if (IS_ERR(vol_args)) {
1604 ret = PTR_ERR(vol_args);
1608 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1610 sizestr = vol_args->name;
1611 devstr = strchr(sizestr, ':');
1613 sizestr = devstr + 1;
1615 devstr = vol_args->name;
1616 ret = kstrtoull(devstr, 10, &devid);
1623 btrfs_info(fs_info, "resizing devid %llu", devid);
1626 device = btrfs_find_device(fs_info, devid, NULL, NULL);
1628 btrfs_info(fs_info, "resizer unable to find device %llu",
1634 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1636 "resizer unable to apply on readonly device %llu",
1642 if (!strcmp(sizestr, "max"))
1643 new_size = device->bdev->bd_inode->i_size;
1645 if (sizestr[0] == '-') {
1648 } else if (sizestr[0] == '+') {
1652 new_size = memparse(sizestr, &retptr);
1653 if (*retptr != '\0' || new_size == 0) {
1659 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1664 old_size = btrfs_device_get_total_bytes(device);
1667 if (new_size > old_size) {
1671 new_size = old_size - new_size;
1672 } else if (mod > 0) {
1673 if (new_size > ULLONG_MAX - old_size) {
1677 new_size = old_size + new_size;
1680 if (new_size < SZ_256M) {
1684 if (new_size > device->bdev->bd_inode->i_size) {
1689 new_size = round_down(new_size, fs_info->sectorsize);
1691 btrfs_info_in_rcu(fs_info, "new size for %s is %llu",
1692 rcu_str_deref(device->name), new_size);
1694 if (new_size > old_size) {
1695 trans = btrfs_start_transaction(root, 0);
1696 if (IS_ERR(trans)) {
1697 ret = PTR_ERR(trans);
1700 ret = btrfs_grow_device(trans, device, new_size);
1701 btrfs_commit_transaction(trans);
1702 } else if (new_size < old_size) {
1703 ret = btrfs_shrink_device(device, new_size);
1704 } /* equal, nothing need to do */
1709 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
1710 mnt_drop_write_file(file);
1714 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1715 const char *name, unsigned long fd, int subvol,
1716 u64 *transid, bool readonly,
1717 struct btrfs_qgroup_inherit *inherit)
1722 if (!S_ISDIR(file_inode(file)->i_mode))
1725 ret = mnt_want_write_file(file);
1729 namelen = strlen(name);
1730 if (strchr(name, '/')) {
1732 goto out_drop_write;
1735 if (name[0] == '.' &&
1736 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1738 goto out_drop_write;
1742 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1743 NULL, transid, readonly, inherit);
1745 struct fd src = fdget(fd);
1746 struct inode *src_inode;
1749 goto out_drop_write;
1752 src_inode = file_inode(src.file);
1753 if (src_inode->i_sb != file_inode(file)->i_sb) {
1754 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1755 "Snapshot src from another FS");
1757 } else if (!inode_owner_or_capable(src_inode)) {
1759 * Subvolume creation is not restricted, but snapshots
1760 * are limited to own subvolumes only
1764 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1765 BTRFS_I(src_inode)->root,
1766 transid, readonly, inherit);
1771 mnt_drop_write_file(file);
1776 static noinline int btrfs_ioctl_snap_create(struct file *file,
1777 void __user *arg, int subvol)
1779 struct btrfs_ioctl_vol_args *vol_args;
1782 if (!S_ISDIR(file_inode(file)->i_mode))
1785 vol_args = memdup_user(arg, sizeof(*vol_args));
1786 if (IS_ERR(vol_args))
1787 return PTR_ERR(vol_args);
1788 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1790 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1791 vol_args->fd, subvol,
1798 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1799 void __user *arg, int subvol)
1801 struct btrfs_ioctl_vol_args_v2 *vol_args;
1805 bool readonly = false;
1806 struct btrfs_qgroup_inherit *inherit = NULL;
1808 if (!S_ISDIR(file_inode(file)->i_mode))
1811 vol_args = memdup_user(arg, sizeof(*vol_args));
1812 if (IS_ERR(vol_args))
1813 return PTR_ERR(vol_args);
1814 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1816 if (vol_args->flags &
1817 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1818 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1823 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1825 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1827 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1828 if (vol_args->size > PAGE_SIZE) {
1832 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1833 if (IS_ERR(inherit)) {
1834 ret = PTR_ERR(inherit);
1839 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1840 vol_args->fd, subvol, ptr,
1845 if (ptr && copy_to_user(arg +
1846 offsetof(struct btrfs_ioctl_vol_args_v2,
1858 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1861 struct inode *inode = file_inode(file);
1862 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1863 struct btrfs_root *root = BTRFS_I(inode)->root;
1867 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1870 down_read(&fs_info->subvol_sem);
1871 if (btrfs_root_readonly(root))
1872 flags |= BTRFS_SUBVOL_RDONLY;
1873 up_read(&fs_info->subvol_sem);
1875 if (copy_to_user(arg, &flags, sizeof(flags)))
1881 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1884 struct inode *inode = file_inode(file);
1885 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1886 struct btrfs_root *root = BTRFS_I(inode)->root;
1887 struct btrfs_trans_handle *trans;
1892 if (!inode_owner_or_capable(inode))
1895 ret = mnt_want_write_file(file);
1899 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1901 goto out_drop_write;
1904 if (copy_from_user(&flags, arg, sizeof(flags))) {
1906 goto out_drop_write;
1909 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1911 goto out_drop_write;
1914 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1916 goto out_drop_write;
1919 down_write(&fs_info->subvol_sem);
1922 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1925 root_flags = btrfs_root_flags(&root->root_item);
1926 if (flags & BTRFS_SUBVOL_RDONLY) {
1927 btrfs_set_root_flags(&root->root_item,
1928 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1931 * Block RO -> RW transition if this subvolume is involved in
1934 spin_lock(&root->root_item_lock);
1935 if (root->send_in_progress == 0) {
1936 btrfs_set_root_flags(&root->root_item,
1937 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1938 spin_unlock(&root->root_item_lock);
1940 spin_unlock(&root->root_item_lock);
1942 "Attempt to set subvolume %llu read-write during send",
1943 root->root_key.objectid);
1949 trans = btrfs_start_transaction(root, 1);
1950 if (IS_ERR(trans)) {
1951 ret = PTR_ERR(trans);
1955 ret = btrfs_update_root(trans, fs_info->tree_root,
1956 &root->root_key, &root->root_item);
1958 btrfs_end_transaction(trans);
1962 ret = btrfs_commit_transaction(trans);
1966 btrfs_set_root_flags(&root->root_item, root_flags);
1968 up_write(&fs_info->subvol_sem);
1970 mnt_drop_write_file(file);
1975 static noinline int key_in_sk(struct btrfs_key *key,
1976 struct btrfs_ioctl_search_key *sk)
1978 struct btrfs_key test;
1981 test.objectid = sk->min_objectid;
1982 test.type = sk->min_type;
1983 test.offset = sk->min_offset;
1985 ret = btrfs_comp_cpu_keys(key, &test);
1989 test.objectid = sk->max_objectid;
1990 test.type = sk->max_type;
1991 test.offset = sk->max_offset;
1993 ret = btrfs_comp_cpu_keys(key, &test);
1999 static noinline int copy_to_sk(struct btrfs_path *path,
2000 struct btrfs_key *key,
2001 struct btrfs_ioctl_search_key *sk,
2004 unsigned long *sk_offset,
2008 struct extent_buffer *leaf;
2009 struct btrfs_ioctl_search_header sh;
2010 struct btrfs_key test;
2011 unsigned long item_off;
2012 unsigned long item_len;
2018 leaf = path->nodes[0];
2019 slot = path->slots[0];
2020 nritems = btrfs_header_nritems(leaf);
2022 if (btrfs_header_generation(leaf) > sk->max_transid) {
2026 found_transid = btrfs_header_generation(leaf);
2028 for (i = slot; i < nritems; i++) {
2029 item_off = btrfs_item_ptr_offset(leaf, i);
2030 item_len = btrfs_item_size_nr(leaf, i);
2032 btrfs_item_key_to_cpu(leaf, key, i);
2033 if (!key_in_sk(key, sk))
2036 if (sizeof(sh) + item_len > *buf_size) {
2043 * return one empty item back for v1, which does not
2047 *buf_size = sizeof(sh) + item_len;
2052 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2057 sh.objectid = key->objectid;
2058 sh.offset = key->offset;
2059 sh.type = key->type;
2061 sh.transid = found_transid;
2063 /* copy search result header */
2064 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2069 *sk_offset += sizeof(sh);
2072 char __user *up = ubuf + *sk_offset;
2074 if (read_extent_buffer_to_user(leaf, up,
2075 item_off, item_len)) {
2080 *sk_offset += item_len;
2084 if (ret) /* -EOVERFLOW from above */
2087 if (*num_found >= sk->nr_items) {
2094 test.objectid = sk->max_objectid;
2095 test.type = sk->max_type;
2096 test.offset = sk->max_offset;
2097 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2099 else if (key->offset < (u64)-1)
2101 else if (key->type < (u8)-1) {
2104 } else if (key->objectid < (u64)-1) {
2112 * 0: all items from this leaf copied, continue with next
2113 * 1: * more items can be copied, but unused buffer is too small
2114 * * all items were found
2115 * Either way, it will stops the loop which iterates to the next
2117 * -EOVERFLOW: item was to large for buffer
2118 * -EFAULT: could not copy extent buffer back to userspace
2123 static noinline int search_ioctl(struct inode *inode,
2124 struct btrfs_ioctl_search_key *sk,
2128 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
2129 struct btrfs_root *root;
2130 struct btrfs_key key;
2131 struct btrfs_path *path;
2134 unsigned long sk_offset = 0;
2136 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2137 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2141 path = btrfs_alloc_path();
2145 if (sk->tree_id == 0) {
2146 /* search the root of the inode that was passed */
2147 root = BTRFS_I(inode)->root;
2149 key.objectid = sk->tree_id;
2150 key.type = BTRFS_ROOT_ITEM_KEY;
2151 key.offset = (u64)-1;
2152 root = btrfs_read_fs_root_no_name(info, &key);
2154 btrfs_free_path(path);
2155 return PTR_ERR(root);
2159 key.objectid = sk->min_objectid;
2160 key.type = sk->min_type;
2161 key.offset = sk->min_offset;
2164 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2170 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
2171 &sk_offset, &num_found);
2172 btrfs_release_path(path);
2180 sk->nr_items = num_found;
2181 btrfs_free_path(path);
2185 static noinline int btrfs_ioctl_tree_search(struct file *file,
2188 struct btrfs_ioctl_search_args __user *uargs;
2189 struct btrfs_ioctl_search_key sk;
2190 struct inode *inode;
2194 if (!capable(CAP_SYS_ADMIN))
2197 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2199 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2202 buf_size = sizeof(uargs->buf);
2204 inode = file_inode(file);
2205 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2208 * In the origin implementation an overflow is handled by returning a
2209 * search header with a len of zero, so reset ret.
2211 if (ret == -EOVERFLOW)
2214 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2219 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2222 struct btrfs_ioctl_search_args_v2 __user *uarg;
2223 struct btrfs_ioctl_search_args_v2 args;
2224 struct inode *inode;
2227 const size_t buf_limit = SZ_16M;
2229 if (!capable(CAP_SYS_ADMIN))
2232 /* copy search header and buffer size */
2233 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2234 if (copy_from_user(&args, uarg, sizeof(args)))
2237 buf_size = args.buf_size;
2239 /* limit result size to 16MB */
2240 if (buf_size > buf_limit)
2241 buf_size = buf_limit;
2243 inode = file_inode(file);
2244 ret = search_ioctl(inode, &args.key, &buf_size,
2245 (char __user *)(&uarg->buf[0]));
2246 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2248 else if (ret == -EOVERFLOW &&
2249 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2256 * Search INODE_REFs to identify path name of 'dirid' directory
2257 * in a 'tree_id' tree. and sets path name to 'name'.
2259 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2260 u64 tree_id, u64 dirid, char *name)
2262 struct btrfs_root *root;
2263 struct btrfs_key key;
2269 struct btrfs_inode_ref *iref;
2270 struct extent_buffer *l;
2271 struct btrfs_path *path;
2273 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2278 path = btrfs_alloc_path();
2282 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
2284 key.objectid = tree_id;
2285 key.type = BTRFS_ROOT_ITEM_KEY;
2286 key.offset = (u64)-1;
2287 root = btrfs_read_fs_root_no_name(info, &key);
2289 ret = PTR_ERR(root);
2293 key.objectid = dirid;
2294 key.type = BTRFS_INODE_REF_KEY;
2295 key.offset = (u64)-1;
2298 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2302 ret = btrfs_previous_item(root, path, dirid,
2303 BTRFS_INODE_REF_KEY);
2313 slot = path->slots[0];
2314 btrfs_item_key_to_cpu(l, &key, slot);
2316 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2317 len = btrfs_inode_ref_name_len(l, iref);
2319 total_len += len + 1;
2321 ret = -ENAMETOOLONG;
2326 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2328 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2331 btrfs_release_path(path);
2332 key.objectid = key.offset;
2333 key.offset = (u64)-1;
2334 dirid = key.objectid;
2336 memmove(name, ptr, total_len);
2337 name[total_len] = '\0';
2340 btrfs_free_path(path);
2344 static int btrfs_search_path_in_tree_user(struct inode *inode,
2345 struct btrfs_ioctl_ino_lookup_user_args *args)
2347 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2348 struct super_block *sb = inode->i_sb;
2349 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2350 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2351 u64 dirid = args->dirid;
2352 unsigned long item_off;
2353 unsigned long item_len;
2354 struct btrfs_inode_ref *iref;
2355 struct btrfs_root_ref *rref;
2356 struct btrfs_root *root;
2357 struct btrfs_path *path;
2358 struct btrfs_key key, key2;
2359 struct extent_buffer *leaf;
2360 struct inode *temp_inode;
2367 path = btrfs_alloc_path();
2372 * If the bottom subvolume does not exist directly under upper_limit,
2373 * construct the path in from the bottom up.
2375 if (dirid != upper_limit.objectid) {
2376 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2378 key.objectid = treeid;
2379 key.type = BTRFS_ROOT_ITEM_KEY;
2380 key.offset = (u64)-1;
2381 root = btrfs_read_fs_root_no_name(fs_info, &key);
2383 ret = PTR_ERR(root);
2387 key.objectid = dirid;
2388 key.type = BTRFS_INODE_REF_KEY;
2389 key.offset = (u64)-1;
2391 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2394 } else if (ret > 0) {
2395 ret = btrfs_previous_item(root, path, dirid,
2396 BTRFS_INODE_REF_KEY);
2399 } else if (ret > 0) {
2405 leaf = path->nodes[0];
2406 slot = path->slots[0];
2407 btrfs_item_key_to_cpu(leaf, &key, slot);
2409 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2410 len = btrfs_inode_ref_name_len(leaf, iref);
2412 total_len += len + 1;
2413 if (ptr < args->path) {
2414 ret = -ENAMETOOLONG;
2419 read_extent_buffer(leaf, ptr,
2420 (unsigned long)(iref + 1), len);
2422 /* Check the read+exec permission of this directory */
2423 ret = btrfs_previous_item(root, path, dirid,
2424 BTRFS_INODE_ITEM_KEY);
2427 } else if (ret > 0) {
2432 leaf = path->nodes[0];
2433 slot = path->slots[0];
2434 btrfs_item_key_to_cpu(leaf, &key2, slot);
2435 if (key2.objectid != dirid) {
2440 temp_inode = btrfs_iget(sb, &key2, root, NULL);
2441 ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
2448 if (key.offset == upper_limit.objectid)
2450 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2455 btrfs_release_path(path);
2456 key.objectid = key.offset;
2457 key.offset = (u64)-1;
2458 dirid = key.objectid;
2461 memmove(args->path, ptr, total_len);
2462 args->path[total_len] = '\0';
2463 btrfs_release_path(path);
2466 /* Get the bottom subvolume's name from ROOT_REF */
2467 root = fs_info->tree_root;
2468 key.objectid = treeid;
2469 key.type = BTRFS_ROOT_REF_KEY;
2470 key.offset = args->treeid;
2471 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2474 } else if (ret > 0) {
2479 leaf = path->nodes[0];
2480 slot = path->slots[0];
2481 btrfs_item_key_to_cpu(leaf, &key, slot);
2483 item_off = btrfs_item_ptr_offset(leaf, slot);
2484 item_len = btrfs_item_size_nr(leaf, slot);
2485 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2486 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2487 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2492 /* Copy subvolume's name */
2493 item_off += sizeof(struct btrfs_root_ref);
2494 item_len -= sizeof(struct btrfs_root_ref);
2495 read_extent_buffer(leaf, args->name, item_off, item_len);
2496 args->name[item_len] = 0;
2499 btrfs_free_path(path);
2503 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2506 struct btrfs_ioctl_ino_lookup_args *args;
2507 struct inode *inode;
2510 args = memdup_user(argp, sizeof(*args));
2512 return PTR_ERR(args);
2514 inode = file_inode(file);
2517 * Unprivileged query to obtain the containing subvolume root id. The
2518 * path is reset so it's consistent with btrfs_search_path_in_tree.
2520 if (args->treeid == 0)
2521 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2523 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2528 if (!capable(CAP_SYS_ADMIN)) {
2533 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2534 args->treeid, args->objectid,
2538 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2546 * Version of ino_lookup ioctl (unprivileged)
2548 * The main differences from ino_lookup ioctl are:
2550 * 1. Read + Exec permission will be checked using inode_permission() during
2551 * path construction. -EACCES will be returned in case of failure.
2552 * 2. Path construction will be stopped at the inode number which corresponds
2553 * to the fd with which this ioctl is called. If constructed path does not
2554 * exist under fd's inode, -EACCES will be returned.
2555 * 3. The name of bottom subvolume is also searched and filled.
2557 static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2559 struct btrfs_ioctl_ino_lookup_user_args *args;
2560 struct inode *inode;
2563 args = memdup_user(argp, sizeof(*args));
2565 return PTR_ERR(args);
2567 inode = file_inode(file);
2569 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2570 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2572 * The subvolume does not exist under fd with which this is
2579 ret = btrfs_search_path_in_tree_user(inode, args);
2581 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2588 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2589 static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2591 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2592 struct btrfs_fs_info *fs_info;
2593 struct btrfs_root *root;
2594 struct btrfs_path *path;
2595 struct btrfs_key key;
2596 struct btrfs_root_item *root_item;
2597 struct btrfs_root_ref *rref;
2598 struct extent_buffer *leaf;
2599 unsigned long item_off;
2600 unsigned long item_len;
2601 struct inode *inode;
2605 path = btrfs_alloc_path();
2609 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2611 btrfs_free_path(path);
2615 inode = file_inode(file);
2616 fs_info = BTRFS_I(inode)->root->fs_info;
2618 /* Get root_item of inode's subvolume */
2619 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2620 key.type = BTRFS_ROOT_ITEM_KEY;
2621 key.offset = (u64)-1;
2622 root = btrfs_read_fs_root_no_name(fs_info, &key);
2624 ret = PTR_ERR(root);
2627 root_item = &root->root_item;
2629 subvol_info->treeid = key.objectid;
2631 subvol_info->generation = btrfs_root_generation(root_item);
2632 subvol_info->flags = btrfs_root_flags(root_item);
2634 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2635 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2637 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2640 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2641 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2642 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2644 subvol_info->otransid = btrfs_root_otransid(root_item);
2645 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2646 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2648 subvol_info->stransid = btrfs_root_stransid(root_item);
2649 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2650 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2652 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2653 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2654 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2656 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2657 /* Search root tree for ROOT_BACKREF of this subvolume */
2658 root = fs_info->tree_root;
2660 key.type = BTRFS_ROOT_BACKREF_KEY;
2662 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2665 } else if (path->slots[0] >=
2666 btrfs_header_nritems(path->nodes[0])) {
2667 ret = btrfs_next_leaf(root, path);
2670 } else if (ret > 0) {
2676 leaf = path->nodes[0];
2677 slot = path->slots[0];
2678 btrfs_item_key_to_cpu(leaf, &key, slot);
2679 if (key.objectid == subvol_info->treeid &&
2680 key.type == BTRFS_ROOT_BACKREF_KEY) {
2681 subvol_info->parent_id = key.offset;
2683 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2684 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2686 item_off = btrfs_item_ptr_offset(leaf, slot)
2687 + sizeof(struct btrfs_root_ref);
2688 item_len = btrfs_item_size_nr(leaf, slot)
2689 - sizeof(struct btrfs_root_ref);
2690 read_extent_buffer(leaf, subvol_info->name,
2691 item_off, item_len);
2698 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2702 btrfs_free_path(path);
2703 kzfree(subvol_info);
2708 * Return ROOT_REF information of the subvolume containing this inode
2709 * except the subvolume name.
2711 static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2713 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2714 struct btrfs_root_ref *rref;
2715 struct btrfs_root *root;
2716 struct btrfs_path *path;
2717 struct btrfs_key key;
2718 struct extent_buffer *leaf;
2719 struct inode *inode;
2725 path = btrfs_alloc_path();
2729 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2730 if (IS_ERR(rootrefs)) {
2731 btrfs_free_path(path);
2732 return PTR_ERR(rootrefs);
2735 inode = file_inode(file);
2736 root = BTRFS_I(inode)->root->fs_info->tree_root;
2737 objectid = BTRFS_I(inode)->root->root_key.objectid;
2739 key.objectid = objectid;
2740 key.type = BTRFS_ROOT_REF_KEY;
2741 key.offset = rootrefs->min_treeid;
2744 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2747 } else if (path->slots[0] >=
2748 btrfs_header_nritems(path->nodes[0])) {
2749 ret = btrfs_next_leaf(root, path);
2752 } else if (ret > 0) {
2758 leaf = path->nodes[0];
2759 slot = path->slots[0];
2761 btrfs_item_key_to_cpu(leaf, &key, slot);
2762 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2767 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2772 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2773 rootrefs->rootref[found].treeid = key.offset;
2774 rootrefs->rootref[found].dirid =
2775 btrfs_root_ref_dirid(leaf, rref);
2778 ret = btrfs_next_item(root, path);
2781 } else if (ret > 0) {
2788 if (!ret || ret == -EOVERFLOW) {
2789 rootrefs->num_items = found;
2790 /* update min_treeid for next search */
2792 rootrefs->min_treeid =
2793 rootrefs->rootref[found - 1].treeid + 1;
2794 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2799 btrfs_free_path(path);
2804 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2807 struct dentry *parent = file->f_path.dentry;
2808 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2809 struct dentry *dentry;
2810 struct inode *dir = d_inode(parent);
2811 struct inode *inode;
2812 struct btrfs_root *root = BTRFS_I(dir)->root;
2813 struct btrfs_root *dest = NULL;
2814 struct btrfs_ioctl_vol_args *vol_args;
2818 if (!S_ISDIR(dir->i_mode))
2821 vol_args = memdup_user(arg, sizeof(*vol_args));
2822 if (IS_ERR(vol_args))
2823 return PTR_ERR(vol_args);
2825 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2826 namelen = strlen(vol_args->name);
2827 if (strchr(vol_args->name, '/') ||
2828 strncmp(vol_args->name, "..", namelen) == 0) {
2833 err = mnt_want_write_file(file);
2838 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2840 goto out_drop_write;
2841 dentry = lookup_one_len(vol_args->name, parent, namelen);
2842 if (IS_ERR(dentry)) {
2843 err = PTR_ERR(dentry);
2844 goto out_unlock_dir;
2847 if (d_really_is_negative(dentry)) {
2852 inode = d_inode(dentry);
2853 dest = BTRFS_I(inode)->root;
2854 if (!capable(CAP_SYS_ADMIN)) {
2856 * Regular user. Only allow this with a special mount
2857 * option, when the user has write+exec access to the
2858 * subvol root, and when rmdir(2) would have been
2861 * Note that this is _not_ check that the subvol is
2862 * empty or doesn't contain data that we wouldn't
2863 * otherwise be able to delete.
2865 * Users who want to delete empty subvols should try
2869 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
2873 * Do not allow deletion if the parent dir is the same
2874 * as the dir to be deleted. That means the ioctl
2875 * must be called on the dentry referencing the root
2876 * of the subvol, not a random directory contained
2883 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2888 /* check if subvolume may be deleted by a user */
2889 err = btrfs_may_delete(dir, dentry, 1);
2893 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
2899 err = btrfs_delete_subvolume(dir, dentry);
2900 inode_unlock(inode);
2909 mnt_drop_write_file(file);
2915 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2917 struct inode *inode = file_inode(file);
2918 struct btrfs_root *root = BTRFS_I(inode)->root;
2919 struct btrfs_ioctl_defrag_range_args *range;
2922 ret = mnt_want_write_file(file);
2926 if (btrfs_root_readonly(root)) {
2931 switch (inode->i_mode & S_IFMT) {
2933 if (!capable(CAP_SYS_ADMIN)) {
2937 ret = btrfs_defrag_root(root);
2940 if (!(file->f_mode & FMODE_WRITE)) {
2945 range = kzalloc(sizeof(*range), GFP_KERNEL);
2952 if (copy_from_user(range, argp,
2958 /* compression requires us to start the IO */
2959 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2960 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2961 range->extent_thresh = (u32)-1;
2964 /* the rest are all set to zero by kzalloc */
2965 range->len = (u64)-1;
2967 ret = btrfs_defrag_file(file_inode(file), file,
2968 range, BTRFS_OLDEST_GENERATION, 0);
2977 mnt_drop_write_file(file);
2981 static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
2983 struct btrfs_ioctl_vol_args *vol_args;
2986 if (!capable(CAP_SYS_ADMIN))
2989 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags))
2990 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2992 vol_args = memdup_user(arg, sizeof(*vol_args));
2993 if (IS_ERR(vol_args)) {
2994 ret = PTR_ERR(vol_args);
2998 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2999 ret = btrfs_init_new_device(fs_info, vol_args->name);
3002 btrfs_info(fs_info, "disk added %s", vol_args->name);
3006 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3010 static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
3012 struct inode *inode = file_inode(file);
3013 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3014 struct btrfs_ioctl_vol_args_v2 *vol_args;
3017 if (!capable(CAP_SYS_ADMIN))
3020 ret = mnt_want_write_file(file);
3024 vol_args = memdup_user(arg, sizeof(*vol_args));
3025 if (IS_ERR(vol_args)) {
3026 ret = PTR_ERR(vol_args);
3030 /* Check for compatibility reject unknown flags */
3031 if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) {
3036 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3037 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3041 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
3042 ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
3044 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
3045 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3047 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3050 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3051 btrfs_info(fs_info, "device deleted: id %llu",
3054 btrfs_info(fs_info, "device deleted: %s",
3060 mnt_drop_write_file(file);
3064 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
3066 struct inode *inode = file_inode(file);
3067 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3068 struct btrfs_ioctl_vol_args *vol_args;
3071 if (!capable(CAP_SYS_ADMIN))
3074 ret = mnt_want_write_file(file);
3078 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
3079 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3080 goto out_drop_write;
3083 vol_args = memdup_user(arg, sizeof(*vol_args));
3084 if (IS_ERR(vol_args)) {
3085 ret = PTR_ERR(vol_args);
3089 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3090 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3093 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
3096 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3098 mnt_drop_write_file(file);
3103 static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3106 struct btrfs_ioctl_fs_info_args *fi_args;
3107 struct btrfs_device *device;
3108 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
3111 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
3116 fi_args->num_devices = fs_devices->num_devices;
3118 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
3119 if (device->devid > fi_args->max_id)
3120 fi_args->max_id = device->devid;
3124 memcpy(&fi_args->fsid, fs_info->fsid, sizeof(fi_args->fsid));
3125 fi_args->nodesize = fs_info->nodesize;
3126 fi_args->sectorsize = fs_info->sectorsize;
3127 fi_args->clone_alignment = fs_info->sectorsize;
3129 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3136 static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3139 struct btrfs_ioctl_dev_info_args *di_args;
3140 struct btrfs_device *dev;
3142 char *s_uuid = NULL;
3144 di_args = memdup_user(arg, sizeof(*di_args));
3145 if (IS_ERR(di_args))
3146 return PTR_ERR(di_args);
3148 if (!btrfs_is_empty_uuid(di_args->uuid))
3149 s_uuid = di_args->uuid;
3152 dev = btrfs_find_device(fs_info, di_args->devid, s_uuid, NULL);
3159 di_args->devid = dev->devid;
3160 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3161 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
3162 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
3164 struct rcu_string *name;
3166 name = rcu_dereference(dev->name);
3167 strncpy(di_args->path, name->str, sizeof(di_args->path) - 1);
3168 di_args->path[sizeof(di_args->path) - 1] = 0;
3170 di_args->path[0] = '\0';
3175 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3182 static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
3186 page = grab_cache_page(inode->i_mapping, index);
3188 return ERR_PTR(-ENOMEM);
3190 if (!PageUptodate(page)) {
3193 ret = btrfs_readpage(NULL, page);
3195 return ERR_PTR(ret);
3197 if (!PageUptodate(page)) {
3200 return ERR_PTR(-EIO);
3202 if (page->mapping != inode->i_mapping) {
3205 return ERR_PTR(-EAGAIN);
3212 static int gather_extent_pages(struct inode *inode, struct page **pages,
3213 int num_pages, u64 off)
3216 pgoff_t index = off >> PAGE_SHIFT;
3218 for (i = 0; i < num_pages; i++) {
3220 pages[i] = extent_same_get_page(inode, index + i);
3221 if (IS_ERR(pages[i])) {
3222 int err = PTR_ERR(pages[i]);
3233 static int lock_extent_range(struct inode *inode, u64 off, u64 len,
3234 bool retry_range_locking)
3237 * Do any pending delalloc/csum calculations on inode, one way or
3238 * another, and lock file content.
3239 * The locking order is:
3242 * 2) range in the inode's io tree
3245 struct btrfs_ordered_extent *ordered;
3246 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
3247 ordered = btrfs_lookup_first_ordered_extent(inode,
3250 ordered->file_offset + ordered->len <= off ||
3251 ordered->file_offset >= off + len) &&
3252 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
3253 off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
3255 btrfs_put_ordered_extent(ordered);
3258 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
3260 btrfs_put_ordered_extent(ordered);
3261 if (!retry_range_locking)
3263 btrfs_wait_ordered_range(inode, off, len);
3268 static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
3270 inode_unlock(inode1);
3271 inode_unlock(inode2);
3274 static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
3276 if (inode1 < inode2)
3277 swap(inode1, inode2);
3279 inode_lock_nested(inode1, I_MUTEX_PARENT);
3280 inode_lock_nested(inode2, I_MUTEX_CHILD);
3283 static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
3284 struct inode *inode2, u64 loff2, u64 len)
3286 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3287 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3290 static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
3291 struct inode *inode2, u64 loff2, u64 len,
3292 bool retry_range_locking)
3296 if (inode1 < inode2) {
3297 swap(inode1, inode2);
3300 ret = lock_extent_range(inode1, loff1, len, retry_range_locking);
3303 ret = lock_extent_range(inode2, loff2, len, retry_range_locking);
3305 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,
3312 struct page **src_pages;
3313 struct page **dst_pages;
3316 static void btrfs_cmp_data_free(struct cmp_pages *cmp)
3321 for (i = 0; i < cmp->num_pages; i++) {
3322 pg = cmp->src_pages[i];
3327 pg = cmp->dst_pages[i];
3335 static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
3336 struct inode *dst, u64 dst_loff,
3337 u64 len, struct cmp_pages *cmp)
3340 int num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT;
3342 cmp->num_pages = num_pages;
3344 ret = gather_extent_pages(src, cmp->src_pages, num_pages, loff);
3348 ret = gather_extent_pages(dst, cmp->dst_pages, num_pages, dst_loff);
3352 btrfs_cmp_data_free(cmp);
3356 static int btrfs_cmp_data(u64 len, struct cmp_pages *cmp)
3360 struct page *src_page, *dst_page;
3361 unsigned int cmp_len = PAGE_SIZE;
3362 void *addr, *dst_addr;
3366 if (len < PAGE_SIZE)
3369 BUG_ON(i >= cmp->num_pages);
3371 src_page = cmp->src_pages[i];
3372 dst_page = cmp->dst_pages[i];
3373 ASSERT(PageLocked(src_page));
3374 ASSERT(PageLocked(dst_page));
3376 addr = kmap_atomic(src_page);
3377 dst_addr = kmap_atomic(dst_page);
3379 flush_dcache_page(src_page);
3380 flush_dcache_page(dst_page);
3382 if (memcmp(addr, dst_addr, cmp_len))
3385 kunmap_atomic(addr);
3386 kunmap_atomic(dst_addr);
3398 static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
3402 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
3404 if (off + olen > inode->i_size || off + olen < off)
3407 /* if we extend to eof, continue to block boundary */
3408 if (off + len == inode->i_size)
3409 *plen = len = ALIGN(inode->i_size, bs) - off;
3411 /* Check that we are block aligned - btrfs_clone() requires this */
3412 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
3418 static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
3419 struct inode *dst, u64 dst_loff,
3420 struct cmp_pages *cmp)
3424 bool same_inode = (src == dst);
3425 u64 same_lock_start = 0;
3426 u64 same_lock_len = 0;
3428 ret = extent_same_check_offsets(src, loff, &len, olen);
3432 ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
3438 * Single inode case wants the same checks, except we
3439 * don't want our length pushed out past i_size as
3440 * comparing that data range makes no sense.
3442 * extent_same_check_offsets() will do this for an
3443 * unaligned length at i_size, so catch it here and
3444 * reject the request.
3446 * This effectively means we require aligned extents
3447 * for the single-inode case, whereas the other cases
3448 * allow an unaligned length so long as it ends at
3454 /* Check for overlapping ranges */
3455 if (dst_loff + len > loff && dst_loff < loff + len)
3458 same_lock_start = min_t(u64, loff, dst_loff);
3459 same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
3463 ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, cmp);
3468 ret = lock_extent_range(src, same_lock_start, same_lock_len,
3471 ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,
3474 * If one of the inodes has dirty pages in the respective range or
3475 * ordered extents, we need to flush dellaloc and wait for all ordered
3476 * extents in the range. We must unlock the pages and the ranges in the
3477 * io trees to avoid deadlocks when flushing delalloc (requires locking
3478 * pages) and when waiting for ordered extents to complete (they require
3481 if (ret == -EAGAIN) {
3483 * Ranges in the io trees already unlocked. Now unlock all
3484 * pages before waiting for all IO to complete.
3486 btrfs_cmp_data_free(cmp);
3488 btrfs_wait_ordered_range(src, same_lock_start,
3491 btrfs_wait_ordered_range(src, loff, len);
3492 btrfs_wait_ordered_range(dst, dst_loff, len);
3498 /* ranges in the io trees already unlocked */
3499 btrfs_cmp_data_free(cmp);
3503 /* pass original length for comparison so we stay within i_size */
3504 ret = btrfs_cmp_data(olen, cmp);
3506 ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
3509 unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start,
3510 same_lock_start + same_lock_len - 1);
3512 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3514 btrfs_cmp_data_free(cmp);
3519 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3521 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3522 struct inode *dst, u64 dst_loff)
3525 struct cmp_pages cmp;
3526 int num_pages = PAGE_ALIGN(BTRFS_MAX_DEDUPE_LEN) >> PAGE_SHIFT;
3527 bool same_inode = (src == dst);
3528 u64 i, tail_len, chunk_count;
3536 btrfs_double_inode_lock(src, dst);
3538 /* don't make the dst file partly checksummed */
3539 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3540 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
3545 tail_len = olen % BTRFS_MAX_DEDUPE_LEN;
3546 chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN);
3547 if (chunk_count == 0)
3548 num_pages = PAGE_ALIGN(tail_len) >> PAGE_SHIFT;
3551 * If deduping ranges in the same inode, locking rules make it
3552 * mandatory to always lock pages in ascending order to avoid deadlocks
3553 * with concurrent tasks (such as starting writeback/delalloc).
3555 if (same_inode && dst_loff < loff)
3556 swap(loff, dst_loff);
3559 * We must gather up all the pages before we initiate our extent
3560 * locking. We use an array for the page pointers. Size of the array is
3561 * bounded by len, which is in turn bounded by BTRFS_MAX_DEDUPE_LEN.
3563 cmp.src_pages = kvmalloc_array(num_pages, sizeof(struct page *),
3564 GFP_KERNEL | __GFP_ZERO);
3565 cmp.dst_pages = kvmalloc_array(num_pages, sizeof(struct page *),
3566 GFP_KERNEL | __GFP_ZERO);
3567 if (!cmp.src_pages || !cmp.dst_pages) {
3572 for (i = 0; i < chunk_count; i++) {
3573 ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
3574 dst, dst_loff, &cmp);
3578 loff += BTRFS_MAX_DEDUPE_LEN;
3579 dst_loff += BTRFS_MAX_DEDUPE_LEN;
3583 ret = btrfs_extent_same_range(src, loff, tail_len, dst,
3590 btrfs_double_inode_unlock(src, dst);
3593 kvfree(cmp.src_pages);
3594 kvfree(cmp.dst_pages);
3599 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3600 struct file *dst_file, u64 dst_loff)
3602 struct inode *src = file_inode(src_file);
3603 struct inode *dst = file_inode(dst_file);
3604 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3607 if (WARN_ON_ONCE(bs < PAGE_SIZE)) {
3609 * Btrfs does not support blocksize < page_size. As a
3610 * result, btrfs_cmp_data() won't correctly handle
3611 * this situation without an update.
3616 res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
3622 static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3623 struct inode *inode,
3629 struct btrfs_root *root = BTRFS_I(inode)->root;
3632 inode_inc_iversion(inode);
3633 if (!no_time_update)
3634 inode->i_mtime = inode->i_ctime = current_time(inode);
3636 * We round up to the block size at eof when determining which
3637 * extents to clone above, but shouldn't round up the file size.
3639 if (endoff > destoff + olen)
3640 endoff = destoff + olen;
3641 if (endoff > inode->i_size)
3642 btrfs_i_size_write(BTRFS_I(inode), endoff);
3644 ret = btrfs_update_inode(trans, root, inode);
3646 btrfs_abort_transaction(trans, ret);
3647 btrfs_end_transaction(trans);
3650 ret = btrfs_end_transaction(trans);
3655 static void clone_update_extent_map(struct btrfs_inode *inode,
3656 const struct btrfs_trans_handle *trans,
3657 const struct btrfs_path *path,
3658 const u64 hole_offset,
3661 struct extent_map_tree *em_tree = &inode->extent_tree;
3662 struct extent_map *em;
3665 em = alloc_extent_map();
3667 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
3672 struct btrfs_file_extent_item *fi;
3674 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3675 struct btrfs_file_extent_item);
3676 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3677 em->generation = -1;
3678 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3679 BTRFS_FILE_EXTENT_INLINE)
3680 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3681 &inode->runtime_flags);
3683 em->start = hole_offset;
3685 em->ram_bytes = em->len;
3686 em->orig_start = hole_offset;
3687 em->block_start = EXTENT_MAP_HOLE;
3689 em->orig_block_len = 0;
3690 em->compress_type = BTRFS_COMPRESS_NONE;
3691 em->generation = trans->transid;
3695 write_lock(&em_tree->lock);
3696 ret = add_extent_mapping(em_tree, em, 1);
3697 write_unlock(&em_tree->lock);
3698 if (ret != -EEXIST) {
3699 free_extent_map(em);
3702 btrfs_drop_extent_cache(inode, em->start,
3703 em->start + em->len - 1, 0);
3707 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
3711 * Make sure we do not end up inserting an inline extent into a file that has
3712 * already other (non-inline) extents. If a file has an inline extent it can
3713 * not have any other extents and the (single) inline extent must start at the
3714 * file offset 0. Failing to respect these rules will lead to file corruption,
3715 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3717 * We can have extents that have been already written to disk or we can have
3718 * dirty ranges still in delalloc, in which case the extent maps and items are
3719 * created only when we run delalloc, and the delalloc ranges might fall outside
3720 * the range we are currently locking in the inode's io tree. So we check the
3721 * inode's i_size because of that (i_size updates are done while holding the
3722 * i_mutex, which we are holding here).
3723 * We also check to see if the inode has a size not greater than "datal" but has
3724 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3725 * protected against such concurrent fallocate calls by the i_mutex).
3727 * If the file has no extents but a size greater than datal, do not allow the
3728 * copy because we would need turn the inline extent into a non-inline one (even
3729 * with NO_HOLES enabled). If we find our destination inode only has one inline
3730 * extent, just overwrite it with the source inline extent if its size is less
3731 * than the source extent's size, or we could copy the source inline extent's
3732 * data into the destination inode's inline extent if the later is greater then
3735 static int clone_copy_inline_extent(struct inode *dst,
3736 struct btrfs_trans_handle *trans,
3737 struct btrfs_path *path,
3738 struct btrfs_key *new_key,
3739 const u64 drop_start,
3745 struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb);
3746 struct btrfs_root *root = BTRFS_I(dst)->root;
3747 const u64 aligned_end = ALIGN(new_key->offset + datal,
3748 fs_info->sectorsize);
3750 struct btrfs_key key;
3752 if (new_key->offset > 0)
3755 key.objectid = btrfs_ino(BTRFS_I(dst));
3756 key.type = BTRFS_EXTENT_DATA_KEY;
3758 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3761 } else if (ret > 0) {
3762 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3763 ret = btrfs_next_leaf(root, path);
3767 goto copy_inline_extent;
3769 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3770 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3771 key.type == BTRFS_EXTENT_DATA_KEY) {
3772 ASSERT(key.offset > 0);
3775 } else if (i_size_read(dst) <= datal) {
3776 struct btrfs_file_extent_item *ei;
3780 * If the file size is <= datal, make sure there are no other
3781 * extents following (can happen do to an fallocate call with
3782 * the flag FALLOC_FL_KEEP_SIZE).
3784 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3785 struct btrfs_file_extent_item);
3787 * If it's an inline extent, it can not have other extents
3790 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3791 BTRFS_FILE_EXTENT_INLINE)
3792 goto copy_inline_extent;
3794 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3795 if (ext_len > aligned_end)
3798 ret = btrfs_next_item(root, path);
3801 } else if (ret == 0) {
3802 btrfs_item_key_to_cpu(path->nodes[0], &key,
3804 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
3805 key.type == BTRFS_EXTENT_DATA_KEY)
3812 * We have no extent items, or we have an extent at offset 0 which may
3813 * or may not be inlined. All these cases are dealt the same way.
3815 if (i_size_read(dst) > datal) {
3817 * If the destination inode has an inline extent...
3818 * This would require copying the data from the source inline
3819 * extent into the beginning of the destination's inline extent.
3820 * But this is really complex, both extents can be compressed
3821 * or just one of them, which would require decompressing and
3822 * re-compressing data (which could increase the new compressed
3823 * size, not allowing the compressed data to fit anymore in an
3825 * So just don't support this case for now (it should be rare,
3826 * we are not really saving space when cloning inline extents).
3831 btrfs_release_path(path);
3832 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3835 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3840 const u32 start = btrfs_file_extent_calc_inline_size(0);
3842 memmove(inline_data + start, inline_data + start + skip, datal);
3845 write_extent_buffer(path->nodes[0], inline_data,
3846 btrfs_item_ptr_offset(path->nodes[0],
3849 inode_add_bytes(dst, datal);
3855 * btrfs_clone() - clone a range from inode file to another
3857 * @src: Inode to clone from
3858 * @inode: Inode to clone to
3859 * @off: Offset within source to start clone from
3860 * @olen: Original length, passed by user, of range to clone
3861 * @olen_aligned: Block-aligned value of olen
3862 * @destoff: Offset within @inode to start clone
3863 * @no_time_update: Whether to update mtime/ctime on the target inode
3865 static int btrfs_clone(struct inode *src, struct inode *inode,
3866 const u64 off, const u64 olen, const u64 olen_aligned,
3867 const u64 destoff, int no_time_update)
3869 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3870 struct btrfs_root *root = BTRFS_I(inode)->root;
3871 struct btrfs_path *path = NULL;
3872 struct extent_buffer *leaf;
3873 struct btrfs_trans_handle *trans;
3875 struct btrfs_key key;
3879 const u64 len = olen_aligned;
3880 u64 last_dest_end = destoff;
3883 buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
3887 path = btrfs_alloc_path();
3893 path->reada = READA_FORWARD;
3895 key.objectid = btrfs_ino(BTRFS_I(src));
3896 key.type = BTRFS_EXTENT_DATA_KEY;
3900 u64 next_key_min_offset = key.offset + 1;
3903 * note the key will change type as we walk through the
3906 path->leave_spinning = 1;
3907 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3912 * First search, if no extent item that starts at offset off was
3913 * found but the previous item is an extent item, it's possible
3914 * it might overlap our target range, therefore process it.
3916 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3917 btrfs_item_key_to_cpu(path->nodes[0], &key,
3918 path->slots[0] - 1);
3919 if (key.type == BTRFS_EXTENT_DATA_KEY)
3923 nritems = btrfs_header_nritems(path->nodes[0]);
3925 if (path->slots[0] >= nritems) {
3926 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3931 nritems = btrfs_header_nritems(path->nodes[0]);
3933 leaf = path->nodes[0];
3934 slot = path->slots[0];
3936 btrfs_item_key_to_cpu(leaf, &key, slot);
3937 if (key.type > BTRFS_EXTENT_DATA_KEY ||
3938 key.objectid != btrfs_ino(BTRFS_I(src)))
3941 if (key.type == BTRFS_EXTENT_DATA_KEY) {
3942 struct btrfs_file_extent_item *extent;
3945 struct btrfs_key new_key;
3946 u64 disko = 0, diskl = 0;
3947 u64 datao = 0, datal = 0;
3951 extent = btrfs_item_ptr(leaf, slot,
3952 struct btrfs_file_extent_item);
3953 comp = btrfs_file_extent_compression(leaf, extent);
3954 type = btrfs_file_extent_type(leaf, extent);
3955 if (type == BTRFS_FILE_EXTENT_REG ||
3956 type == BTRFS_FILE_EXTENT_PREALLOC) {
3957 disko = btrfs_file_extent_disk_bytenr(leaf,
3959 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3961 datao = btrfs_file_extent_offset(leaf, extent);
3962 datal = btrfs_file_extent_num_bytes(leaf,
3964 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3965 /* take upper bound, may be compressed */
3966 datal = btrfs_file_extent_ram_bytes(leaf,
3971 * The first search might have left us at an extent
3972 * item that ends before our target range's start, can
3973 * happen if we have holes and NO_HOLES feature enabled.
3975 if (key.offset + datal <= off) {
3978 } else if (key.offset >= off + len) {
3981 next_key_min_offset = key.offset + datal;
3982 size = btrfs_item_size_nr(leaf, slot);
3983 read_extent_buffer(leaf, buf,
3984 btrfs_item_ptr_offset(leaf, slot),
3987 btrfs_release_path(path);
3988 path->leave_spinning = 0;
3990 memcpy(&new_key, &key, sizeof(new_key));
3991 new_key.objectid = btrfs_ino(BTRFS_I(inode));
3992 if (off <= key.offset)
3993 new_key.offset = key.offset + destoff - off;
3995 new_key.offset = destoff;
3998 * Deal with a hole that doesn't have an extent item
3999 * that represents it (NO_HOLES feature enabled).
4000 * This hole is either in the middle of the cloning
4001 * range or at the beginning (fully overlaps it or
4002 * partially overlaps it).
4004 if (new_key.offset != last_dest_end)
4005 drop_start = last_dest_end;
4007 drop_start = new_key.offset;
4010 * 1 - adjusting old extent (we may have to split it)
4011 * 1 - add new extent
4014 trans = btrfs_start_transaction(root, 3);
4015 if (IS_ERR(trans)) {
4016 ret = PTR_ERR(trans);
4020 if (type == BTRFS_FILE_EXTENT_REG ||
4021 type == BTRFS_FILE_EXTENT_PREALLOC) {
4023 * a | --- range to clone ---| b
4024 * | ------------- extent ------------- |
4027 /* subtract range b */
4028 if (key.offset + datal > off + len)
4029 datal = off + len - key.offset;
4031 /* subtract range a */
4032 if (off > key.offset) {
4033 datao += off - key.offset;
4034 datal -= off - key.offset;
4037 ret = btrfs_drop_extents(trans, root, inode,
4039 new_key.offset + datal,
4042 if (ret != -EOPNOTSUPP)
4043 btrfs_abort_transaction(trans,
4045 btrfs_end_transaction(trans);
4049 ret = btrfs_insert_empty_item(trans, root, path,
4052 btrfs_abort_transaction(trans, ret);
4053 btrfs_end_transaction(trans);
4057 leaf = path->nodes[0];
4058 slot = path->slots[0];
4059 write_extent_buffer(leaf, buf,
4060 btrfs_item_ptr_offset(leaf, slot),
4063 extent = btrfs_item_ptr(leaf, slot,
4064 struct btrfs_file_extent_item);
4066 /* disko == 0 means it's a hole */
4070 btrfs_set_file_extent_offset(leaf, extent,
4072 btrfs_set_file_extent_num_bytes(leaf, extent,
4076 inode_add_bytes(inode, datal);
4077 ret = btrfs_inc_extent_ref(trans,
4080 root->root_key.objectid,
4081 btrfs_ino(BTRFS_I(inode)),
4082 new_key.offset - datao);
4084 btrfs_abort_transaction(trans,
4086 btrfs_end_transaction(trans);
4091 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
4095 if (off > key.offset) {
4096 skip = off - key.offset;
4097 new_key.offset += skip;
4100 if (key.offset + datal > off + len)
4101 trim = key.offset + datal - (off + len);
4103 if (comp && (skip || trim)) {
4105 btrfs_end_transaction(trans);
4108 size -= skip + trim;
4109 datal -= skip + trim;
4111 ret = clone_copy_inline_extent(inode,
4118 if (ret != -EOPNOTSUPP)
4119 btrfs_abort_transaction(trans,
4121 btrfs_end_transaction(trans);
4124 leaf = path->nodes[0];
4125 slot = path->slots[0];
4128 /* If we have an implicit hole (NO_HOLES feature). */
4129 if (drop_start < new_key.offset)
4130 clone_update_extent_map(BTRFS_I(inode), trans,
4132 new_key.offset - drop_start);
4134 clone_update_extent_map(BTRFS_I(inode), trans,
4137 btrfs_mark_buffer_dirty(leaf);
4138 btrfs_release_path(path);
4140 last_dest_end = ALIGN(new_key.offset + datal,
4141 fs_info->sectorsize);
4142 ret = clone_finish_inode_update(trans, inode,
4148 if (new_key.offset + datal >= destoff + len)
4151 btrfs_release_path(path);
4152 key.offset = next_key_min_offset;
4154 if (fatal_signal_pending(current)) {
4161 if (last_dest_end < destoff + len) {
4163 * We have an implicit hole (NO_HOLES feature is enabled) that
4164 * fully or partially overlaps our cloning range at its end.
4166 btrfs_release_path(path);
4169 * 1 - remove extent(s)
4172 trans = btrfs_start_transaction(root, 2);
4173 if (IS_ERR(trans)) {
4174 ret = PTR_ERR(trans);
4177 ret = btrfs_drop_extents(trans, root, inode,
4178 last_dest_end, destoff + len, 1);
4180 if (ret != -EOPNOTSUPP)
4181 btrfs_abort_transaction(trans, ret);
4182 btrfs_end_transaction(trans);
4185 clone_update_extent_map(BTRFS_I(inode), trans, NULL,
4187 destoff + len - last_dest_end);
4188 ret = clone_finish_inode_update(trans, inode, destoff + len,
4189 destoff, olen, no_time_update);
4193 btrfs_free_path(path);
4198 static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
4199 u64 off, u64 olen, u64 destoff)
4201 struct inode *inode = file_inode(file);
4202 struct inode *src = file_inode(file_src);
4203 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4204 struct btrfs_root *root = BTRFS_I(inode)->root;
4207 u64 bs = fs_info->sb->s_blocksize;
4208 int same_inode = src == inode;
4212 * - split compressed inline extents. annoying: we need to
4213 * decompress into destination's address_space (the file offset
4214 * may change, so source mapping won't do), then recompress (or
4215 * otherwise reinsert) a subrange.
4217 * - split destination inode's inline extents. The inline extents can
4218 * be either compressed or non-compressed.
4221 if (btrfs_root_readonly(root))
4224 if (file_src->f_path.mnt != file->f_path.mnt ||
4225 src->i_sb != inode->i_sb)
4228 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
4232 btrfs_double_inode_lock(src, inode);
4237 /* don't make the dst file partly checksummed */
4238 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
4239 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
4244 /* determine range to clone */
4246 if (off + len > src->i_size || off + len < off)
4249 olen = len = src->i_size - off;
4250 /* if we extend to eof, continue to block boundary */
4251 if (off + len == src->i_size)
4252 len = ALIGN(src->i_size, bs) - off;
4259 /* verify the end result is block aligned */
4260 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
4261 !IS_ALIGNED(destoff, bs))
4264 /* verify if ranges are overlapped within the same file */
4266 if (destoff + len > off && destoff < off + len)
4270 if (destoff > inode->i_size) {
4271 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
4277 * Lock the target range too. Right after we replace the file extent
4278 * items in the fs tree (which now point to the cloned data), we might
4279 * have a worker replace them with extent items relative to a write
4280 * operation that was issued before this clone operation (i.e. confront
4281 * with inode.c:btrfs_finish_ordered_io).
4284 u64 lock_start = min_t(u64, off, destoff);
4285 u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
4287 ret = lock_extent_range(src, lock_start, lock_len, true);
4289 ret = btrfs_double_extent_lock(src, off, inode, destoff, len,
4294 /* ranges in the io trees already unlocked */
4298 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
4301 u64 lock_start = min_t(u64, off, destoff);
4302 u64 lock_end = max_t(u64, off, destoff) + len - 1;
4304 unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
4306 btrfs_double_extent_unlock(src, off, inode, destoff, len);
4309 * Truncate page cache pages so that future reads will see the cloned
4310 * data immediately and not the previous data.
4312 truncate_inode_pages_range(&inode->i_data,
4313 round_down(destoff, PAGE_SIZE),
4314 round_up(destoff + len, PAGE_SIZE) - 1);
4317 btrfs_double_inode_unlock(src, inode);
4323 int btrfs_clone_file_range(struct file *src_file, loff_t off,
4324 struct file *dst_file, loff_t destoff, u64 len)
4326 return btrfs_clone_files(dst_file, src_file, off, len, destoff);
4329 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
4331 struct inode *inode = file_inode(file);
4332 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4333 struct btrfs_root *root = BTRFS_I(inode)->root;
4334 struct btrfs_root *new_root;
4335 struct btrfs_dir_item *di;
4336 struct btrfs_trans_handle *trans;
4337 struct btrfs_path *path;
4338 struct btrfs_key location;
4339 struct btrfs_disk_key disk_key;
4344 if (!capable(CAP_SYS_ADMIN))
4347 ret = mnt_want_write_file(file);
4351 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
4357 objectid = BTRFS_FS_TREE_OBJECTID;
4359 location.objectid = objectid;
4360 location.type = BTRFS_ROOT_ITEM_KEY;
4361 location.offset = (u64)-1;
4363 new_root = btrfs_read_fs_root_no_name(fs_info, &location);
4364 if (IS_ERR(new_root)) {
4365 ret = PTR_ERR(new_root);
4368 if (!is_fstree(new_root->objectid)) {
4373 path = btrfs_alloc_path();
4378 path->leave_spinning = 1;
4380 trans = btrfs_start_transaction(root, 1);
4381 if (IS_ERR(trans)) {
4382 btrfs_free_path(path);
4383 ret = PTR_ERR(trans);
4387 dir_id = btrfs_super_root_dir(fs_info->super_copy);
4388 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
4389 dir_id, "default", 7, 1);
4390 if (IS_ERR_OR_NULL(di)) {
4391 btrfs_free_path(path);
4392 btrfs_end_transaction(trans);
4394 "Umm, you don't have the default diritem, this isn't going to work");
4399 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4400 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4401 btrfs_mark_buffer_dirty(path->nodes[0]);
4402 btrfs_free_path(path);
4404 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
4405 btrfs_end_transaction(trans);
4407 mnt_drop_write_file(file);
4411 static void get_block_group_info(struct list_head *groups_list,
4412 struct btrfs_ioctl_space_info *space)
4414 struct btrfs_block_group_cache *block_group;
4416 space->total_bytes = 0;
4417 space->used_bytes = 0;
4419 list_for_each_entry(block_group, groups_list, list) {
4420 space->flags = block_group->flags;
4421 space->total_bytes += block_group->key.offset;
4422 space->used_bytes +=
4423 btrfs_block_group_used(&block_group->item);
4427 static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
4430 struct btrfs_ioctl_space_args space_args;
4431 struct btrfs_ioctl_space_info space;
4432 struct btrfs_ioctl_space_info *dest;
4433 struct btrfs_ioctl_space_info *dest_orig;
4434 struct btrfs_ioctl_space_info __user *user_dest;
4435 struct btrfs_space_info *info;
4436 static const u64 types[] = {
4437 BTRFS_BLOCK_GROUP_DATA,
4438 BTRFS_BLOCK_GROUP_SYSTEM,
4439 BTRFS_BLOCK_GROUP_METADATA,
4440 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
4448 if (copy_from_user(&space_args,
4449 (struct btrfs_ioctl_space_args __user *)arg,
4450 sizeof(space_args)))
4453 for (i = 0; i < num_types; i++) {
4454 struct btrfs_space_info *tmp;
4458 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4460 if (tmp->flags == types[i]) {
4470 down_read(&info->groups_sem);
4471 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4472 if (!list_empty(&info->block_groups[c]))
4475 up_read(&info->groups_sem);
4479 * Global block reserve, exported as a space_info
4483 /* space_slots == 0 means they are asking for a count */
4484 if (space_args.space_slots == 0) {
4485 space_args.total_spaces = slot_count;
4489 slot_count = min_t(u64, space_args.space_slots, slot_count);
4491 alloc_size = sizeof(*dest) * slot_count;
4493 /* we generally have at most 6 or so space infos, one for each raid
4494 * level. So, a whole page should be more than enough for everyone
4496 if (alloc_size > PAGE_SIZE)
4499 space_args.total_spaces = 0;
4500 dest = kmalloc(alloc_size, GFP_KERNEL);
4505 /* now we have a buffer to copy into */
4506 for (i = 0; i < num_types; i++) {
4507 struct btrfs_space_info *tmp;
4514 list_for_each_entry_rcu(tmp, &fs_info->space_info,
4516 if (tmp->flags == types[i]) {
4525 down_read(&info->groups_sem);
4526 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4527 if (!list_empty(&info->block_groups[c])) {
4528 get_block_group_info(&info->block_groups[c],
4530 memcpy(dest, &space, sizeof(space));
4532 space_args.total_spaces++;
4538 up_read(&info->groups_sem);
4542 * Add global block reserve
4545 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
4547 spin_lock(&block_rsv->lock);
4548 space.total_bytes = block_rsv->size;
4549 space.used_bytes = block_rsv->size - block_rsv->reserved;
4550 spin_unlock(&block_rsv->lock);
4551 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4552 memcpy(dest, &space, sizeof(space));
4553 space_args.total_spaces++;
4556 user_dest = (struct btrfs_ioctl_space_info __user *)
4557 (arg + sizeof(struct btrfs_ioctl_space_args));
4559 if (copy_to_user(user_dest, dest_orig, alloc_size))
4564 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
4570 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4573 struct btrfs_trans_handle *trans;
4577 trans = btrfs_attach_transaction_barrier(root);
4578 if (IS_ERR(trans)) {
4579 if (PTR_ERR(trans) != -ENOENT)
4580 return PTR_ERR(trans);
4582 /* No running transaction, don't bother */
4583 transid = root->fs_info->last_trans_committed;
4586 transid = trans->transid;
4587 ret = btrfs_commit_transaction_async(trans, 0);
4589 btrfs_end_transaction(trans);
4594 if (copy_to_user(argp, &transid, sizeof(transid)))
4599 static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
4605 if (copy_from_user(&transid, argp, sizeof(transid)))
4608 transid = 0; /* current trans */
4610 return btrfs_wait_for_commit(fs_info, transid);
4613 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4615 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
4616 struct btrfs_ioctl_scrub_args *sa;
4619 if (!capable(CAP_SYS_ADMIN))
4622 sa = memdup_user(arg, sizeof(*sa));
4626 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4627 ret = mnt_want_write_file(file);
4632 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
4633 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4636 if (copy_to_user(arg, sa, sizeof(*sa)))
4639 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4640 mnt_drop_write_file(file);
4646 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
4648 if (!capable(CAP_SYS_ADMIN))
4651 return btrfs_scrub_cancel(fs_info);
4654 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
4657 struct btrfs_ioctl_scrub_args *sa;
4660 if (!capable(CAP_SYS_ADMIN))
4663 sa = memdup_user(arg, sizeof(*sa));
4667 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
4669 if (copy_to_user(arg, sa, sizeof(*sa)))
4676 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
4679 struct btrfs_ioctl_get_dev_stats *sa;
4682 sa = memdup_user(arg, sizeof(*sa));
4686 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4691 ret = btrfs_get_dev_stats(fs_info, sa);
4693 if (copy_to_user(arg, sa, sizeof(*sa)))
4700 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
4703 struct btrfs_ioctl_dev_replace_args *p;
4706 if (!capable(CAP_SYS_ADMIN))
4709 p = memdup_user(arg, sizeof(*p));
4714 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4715 if (sb_rdonly(fs_info->sb)) {
4719 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4720 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4722 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
4723 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
4726 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4727 btrfs_dev_replace_status(fs_info, p);
4730 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4731 p->result = btrfs_dev_replace_cancel(fs_info);
4739 if (copy_to_user(arg, p, sizeof(*p)))
4746 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4752 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4753 struct inode_fs_paths *ipath = NULL;
4754 struct btrfs_path *path;
4756 if (!capable(CAP_DAC_READ_SEARCH))
4759 path = btrfs_alloc_path();
4765 ipa = memdup_user(arg, sizeof(*ipa));
4772 size = min_t(u32, ipa->size, 4096);
4773 ipath = init_ipath(size, root, path);
4774 if (IS_ERR(ipath)) {
4775 ret = PTR_ERR(ipath);
4780 ret = paths_from_inode(ipa->inum, ipath);
4784 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4785 rel_ptr = ipath->fspath->val[i] -
4786 (u64)(unsigned long)ipath->fspath->val;
4787 ipath->fspath->val[i] = rel_ptr;
4790 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
4791 ipath->fspath, size);
4798 btrfs_free_path(path);
4805 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4807 struct btrfs_data_container *inodes = ctx;
4808 const size_t c = 3 * sizeof(u64);
4810 if (inodes->bytes_left >= c) {
4811 inodes->bytes_left -= c;
4812 inodes->val[inodes->elem_cnt] = inum;
4813 inodes->val[inodes->elem_cnt + 1] = offset;
4814 inodes->val[inodes->elem_cnt + 2] = root;
4815 inodes->elem_cnt += 3;
4817 inodes->bytes_missing += c - inodes->bytes_left;
4818 inodes->bytes_left = 0;
4819 inodes->elem_missed += 3;
4825 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
4826 void __user *arg, int version)
4830 struct btrfs_ioctl_logical_ino_args *loi;
4831 struct btrfs_data_container *inodes = NULL;
4832 struct btrfs_path *path = NULL;
4835 if (!capable(CAP_SYS_ADMIN))
4838 loi = memdup_user(arg, sizeof(*loi));
4840 return PTR_ERR(loi);
4843 ignore_offset = false;
4844 size = min_t(u32, loi->size, SZ_64K);
4846 /* All reserved bits must be 0 for now */
4847 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
4851 /* Only accept flags we have defined so far */
4852 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
4856 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
4857 size = min_t(u32, loi->size, SZ_16M);
4860 path = btrfs_alloc_path();
4866 inodes = init_data_container(size);
4867 if (IS_ERR(inodes)) {
4868 ret = PTR_ERR(inodes);
4873 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
4874 build_ino_list, inodes, ignore_offset);
4880 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
4886 btrfs_free_path(path);
4894 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
4895 struct btrfs_ioctl_balance_args *bargs)
4897 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4899 bargs->flags = bctl->flags;
4901 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
4902 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4903 if (atomic_read(&fs_info->balance_pause_req))
4904 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4905 if (atomic_read(&fs_info->balance_cancel_req))
4906 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4908 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4909 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4910 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4912 spin_lock(&fs_info->balance_lock);
4913 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4914 spin_unlock(&fs_info->balance_lock);
4917 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4919 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4920 struct btrfs_fs_info *fs_info = root->fs_info;
4921 struct btrfs_ioctl_balance_args *bargs;
4922 struct btrfs_balance_control *bctl;
4923 bool need_unlock; /* for mut. excl. ops lock */
4926 if (!capable(CAP_SYS_ADMIN))
4929 ret = mnt_want_write_file(file);
4934 if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
4935 mutex_lock(&fs_info->balance_mutex);
4941 * mut. excl. ops lock is locked. Three possibilities:
4942 * (1) some other op is running
4943 * (2) balance is running
4944 * (3) balance is paused -- special case (think resume)
4946 mutex_lock(&fs_info->balance_mutex);
4947 if (fs_info->balance_ctl) {
4948 /* this is either (2) or (3) */
4949 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4950 mutex_unlock(&fs_info->balance_mutex);
4952 * Lock released to allow other waiters to continue,
4953 * we'll reexamine the status again.
4955 mutex_lock(&fs_info->balance_mutex);
4957 if (fs_info->balance_ctl &&
4958 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4960 need_unlock = false;
4964 mutex_unlock(&fs_info->balance_mutex);
4968 mutex_unlock(&fs_info->balance_mutex);
4974 mutex_unlock(&fs_info->balance_mutex);
4975 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4980 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags));
4983 bargs = memdup_user(arg, sizeof(*bargs));
4984 if (IS_ERR(bargs)) {
4985 ret = PTR_ERR(bargs);
4989 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4990 if (!fs_info->balance_ctl) {
4995 bctl = fs_info->balance_ctl;
4996 spin_lock(&fs_info->balance_lock);
4997 bctl->flags |= BTRFS_BALANCE_RESUME;
4998 spin_unlock(&fs_info->balance_lock);
5006 if (fs_info->balance_ctl) {
5011 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
5018 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
5019 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
5020 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
5022 bctl->flags = bargs->flags;
5024 /* balance everything - no filters */
5025 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
5028 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
5035 * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
5036 * btrfs_balance. bctl is freed in reset_balance_state, or, if
5037 * restriper was paused all the way until unmount, in free_fs_info.
5038 * The flag should be cleared after reset_balance_state.
5040 need_unlock = false;
5042 ret = btrfs_balance(fs_info, bctl, bargs);
5046 if (copy_to_user(arg, bargs, sizeof(*bargs)))
5055 mutex_unlock(&fs_info->balance_mutex);
5057 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
5059 mnt_drop_write_file(file);
5063 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
5065 if (!capable(CAP_SYS_ADMIN))
5069 case BTRFS_BALANCE_CTL_PAUSE:
5070 return btrfs_pause_balance(fs_info);
5071 case BTRFS_BALANCE_CTL_CANCEL:
5072 return btrfs_cancel_balance(fs_info);
5078 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
5081 struct btrfs_ioctl_balance_args *bargs;
5084 if (!capable(CAP_SYS_ADMIN))
5087 mutex_lock(&fs_info->balance_mutex);
5088 if (!fs_info->balance_ctl) {
5093 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
5099 btrfs_update_ioctl_balance_args(fs_info, bargs);
5101 if (copy_to_user(arg, bargs, sizeof(*bargs)))
5106 mutex_unlock(&fs_info->balance_mutex);
5110 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5112 struct inode *inode = file_inode(file);
5113 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5114 struct btrfs_ioctl_quota_ctl_args *sa;
5115 struct btrfs_trans_handle *trans = NULL;
5119 if (!capable(CAP_SYS_ADMIN))
5122 ret = mnt_want_write_file(file);
5126 sa = memdup_user(arg, sizeof(*sa));
5132 down_write(&fs_info->subvol_sem);
5133 trans = btrfs_start_transaction(fs_info->tree_root, 2);
5134 if (IS_ERR(trans)) {
5135 ret = PTR_ERR(trans);
5140 case BTRFS_QUOTA_CTL_ENABLE:
5141 ret = btrfs_quota_enable(trans, fs_info);
5143 case BTRFS_QUOTA_CTL_DISABLE:
5144 ret = btrfs_quota_disable(trans, fs_info);
5151 err = btrfs_commit_transaction(trans);
5156 up_write(&fs_info->subvol_sem);
5158 mnt_drop_write_file(file);
5162 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5164 struct inode *inode = file_inode(file);
5165 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5166 struct btrfs_root *root = BTRFS_I(inode)->root;
5167 struct btrfs_ioctl_qgroup_assign_args *sa;
5168 struct btrfs_trans_handle *trans;
5172 if (!capable(CAP_SYS_ADMIN))
5175 ret = mnt_want_write_file(file);
5179 sa = memdup_user(arg, sizeof(*sa));
5185 trans = btrfs_join_transaction(root);
5186 if (IS_ERR(trans)) {
5187 ret = PTR_ERR(trans);
5192 ret = btrfs_add_qgroup_relation(trans, fs_info,
5195 ret = btrfs_del_qgroup_relation(trans, fs_info,
5199 /* update qgroup status and info */
5200 err = btrfs_run_qgroups(trans, fs_info);
5202 btrfs_handle_fs_error(fs_info, err,
5203 "failed to update qgroup status and info");
5204 err = btrfs_end_transaction(trans);
5211 mnt_drop_write_file(file);
5215 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5217 struct inode *inode = file_inode(file);
5218 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5219 struct btrfs_root *root = BTRFS_I(inode)->root;
5220 struct btrfs_ioctl_qgroup_create_args *sa;
5221 struct btrfs_trans_handle *trans;
5225 if (!capable(CAP_SYS_ADMIN))
5228 ret = mnt_want_write_file(file);
5232 sa = memdup_user(arg, sizeof(*sa));
5238 if (!sa->qgroupid) {
5243 trans = btrfs_join_transaction(root);
5244 if (IS_ERR(trans)) {
5245 ret = PTR_ERR(trans);
5250 ret = btrfs_create_qgroup(trans, fs_info, sa->qgroupid);
5252 ret = btrfs_remove_qgroup(trans, fs_info, sa->qgroupid);
5255 err = btrfs_end_transaction(trans);
5262 mnt_drop_write_file(file);
5266 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5268 struct inode *inode = file_inode(file);
5269 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5270 struct btrfs_root *root = BTRFS_I(inode)->root;
5271 struct btrfs_ioctl_qgroup_limit_args *sa;
5272 struct btrfs_trans_handle *trans;
5277 if (!capable(CAP_SYS_ADMIN))
5280 ret = mnt_want_write_file(file);
5284 sa = memdup_user(arg, sizeof(*sa));
5290 trans = btrfs_join_transaction(root);
5291 if (IS_ERR(trans)) {
5292 ret = PTR_ERR(trans);
5296 qgroupid = sa->qgroupid;
5298 /* take the current subvol as qgroup */
5299 qgroupid = root->root_key.objectid;
5302 ret = btrfs_limit_qgroup(trans, fs_info, qgroupid, &sa->lim);
5304 err = btrfs_end_transaction(trans);
5311 mnt_drop_write_file(file);
5315 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
5317 struct inode *inode = file_inode(file);
5318 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5319 struct btrfs_ioctl_quota_rescan_args *qsa;
5322 if (!capable(CAP_SYS_ADMIN))
5325 ret = mnt_want_write_file(file);
5329 qsa = memdup_user(arg, sizeof(*qsa));
5340 ret = btrfs_qgroup_rescan(fs_info);
5345 mnt_drop_write_file(file);
5349 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
5351 struct inode *inode = file_inode(file);
5352 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5353 struct btrfs_ioctl_quota_rescan_args *qsa;
5356 if (!capable(CAP_SYS_ADMIN))
5359 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
5363 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
5365 qsa->progress = fs_info->qgroup_rescan_progress.objectid;
5368 if (copy_to_user(arg, qsa, sizeof(*qsa)))
5375 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
5377 struct inode *inode = file_inode(file);
5378 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5380 if (!capable(CAP_SYS_ADMIN))
5383 return btrfs_qgroup_wait_for_completion(fs_info, true);
5386 static long _btrfs_ioctl_set_received_subvol(struct file *file,
5387 struct btrfs_ioctl_received_subvol_args *sa)
5389 struct inode *inode = file_inode(file);
5390 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5391 struct btrfs_root *root = BTRFS_I(inode)->root;
5392 struct btrfs_root_item *root_item = &root->root_item;
5393 struct btrfs_trans_handle *trans;
5394 struct timespec ct = current_time(inode);
5396 int received_uuid_changed;
5398 if (!inode_owner_or_capable(inode))
5401 ret = mnt_want_write_file(file);
5405 down_write(&fs_info->subvol_sem);
5407 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
5412 if (btrfs_root_readonly(root)) {
5419 * 2 - uuid items (received uuid + subvol uuid)
5421 trans = btrfs_start_transaction(root, 3);
5422 if (IS_ERR(trans)) {
5423 ret = PTR_ERR(trans);
5428 sa->rtransid = trans->transid;
5429 sa->rtime.sec = ct.tv_sec;
5430 sa->rtime.nsec = ct.tv_nsec;
5432 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5434 if (received_uuid_changed &&
5435 !btrfs_is_empty_uuid(root_item->received_uuid)) {
5436 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
5437 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5438 root->root_key.objectid);
5439 if (ret && ret != -ENOENT) {
5440 btrfs_abort_transaction(trans, ret);
5441 btrfs_end_transaction(trans);
5445 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5446 btrfs_set_root_stransid(root_item, sa->stransid);
5447 btrfs_set_root_rtransid(root_item, sa->rtransid);
5448 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5449 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5450 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5451 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
5453 ret = btrfs_update_root(trans, fs_info->tree_root,
5454 &root->root_key, &root->root_item);
5456 btrfs_end_transaction(trans);
5459 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
5460 ret = btrfs_uuid_tree_add(trans, sa->uuid,
5461 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5462 root->root_key.objectid);
5463 if (ret < 0 && ret != -EEXIST) {
5464 btrfs_abort_transaction(trans, ret);
5465 btrfs_end_transaction(trans);
5469 ret = btrfs_commit_transaction(trans);
5471 up_write(&fs_info->subvol_sem);
5472 mnt_drop_write_file(file);
5477 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5480 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5481 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5484 args32 = memdup_user(arg, sizeof(*args32));
5486 return PTR_ERR(args32);
5488 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5494 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5495 args64->stransid = args32->stransid;
5496 args64->rtransid = args32->rtransid;
5497 args64->stime.sec = args32->stime.sec;
5498 args64->stime.nsec = args32->stime.nsec;
5499 args64->rtime.sec = args32->rtime.sec;
5500 args64->rtime.nsec = args32->rtime.nsec;
5501 args64->flags = args32->flags;
5503 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5507 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5508 args32->stransid = args64->stransid;
5509 args32->rtransid = args64->rtransid;
5510 args32->stime.sec = args64->stime.sec;
5511 args32->stime.nsec = args64->stime.nsec;
5512 args32->rtime.sec = args64->rtime.sec;
5513 args32->rtime.nsec = args64->rtime.nsec;
5514 args32->flags = args64->flags;
5516 ret = copy_to_user(arg, args32, sizeof(*args32));
5527 static long btrfs_ioctl_set_received_subvol(struct file *file,
5530 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5533 sa = memdup_user(arg, sizeof(*sa));
5537 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5542 ret = copy_to_user(arg, sa, sizeof(*sa));
5551 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5553 struct inode *inode = file_inode(file);
5554 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5557 char label[BTRFS_LABEL_SIZE];
5559 spin_lock(&fs_info->super_lock);
5560 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5561 spin_unlock(&fs_info->super_lock);
5563 len = strnlen(label, BTRFS_LABEL_SIZE);
5565 if (len == BTRFS_LABEL_SIZE) {
5567 "label is too long, return the first %zu bytes",
5571 ret = copy_to_user(arg, label, len);
5573 return ret ? -EFAULT : 0;
5576 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5578 struct inode *inode = file_inode(file);
5579 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5580 struct btrfs_root *root = BTRFS_I(inode)->root;
5581 struct btrfs_super_block *super_block = fs_info->super_copy;
5582 struct btrfs_trans_handle *trans;
5583 char label[BTRFS_LABEL_SIZE];
5586 if (!capable(CAP_SYS_ADMIN))
5589 if (copy_from_user(label, arg, sizeof(label)))
5592 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5594 "unable to set label with more than %d bytes",
5595 BTRFS_LABEL_SIZE - 1);
5599 ret = mnt_want_write_file(file);
5603 trans = btrfs_start_transaction(root, 0);
5604 if (IS_ERR(trans)) {
5605 ret = PTR_ERR(trans);
5609 spin_lock(&fs_info->super_lock);
5610 strcpy(super_block->label, label);
5611 spin_unlock(&fs_info->super_lock);
5612 ret = btrfs_commit_transaction(trans);
5615 mnt_drop_write_file(file);
5619 #define INIT_FEATURE_FLAGS(suffix) \
5620 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5621 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5622 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5624 int btrfs_ioctl_get_supported_features(void __user *arg)
5626 static const struct btrfs_ioctl_feature_flags features[3] = {
5627 INIT_FEATURE_FLAGS(SUPP),
5628 INIT_FEATURE_FLAGS(SAFE_SET),
5629 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5632 if (copy_to_user(arg, &features, sizeof(features)))
5638 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5640 struct inode *inode = file_inode(file);
5641 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5642 struct btrfs_super_block *super_block = fs_info->super_copy;
5643 struct btrfs_ioctl_feature_flags features;
5645 features.compat_flags = btrfs_super_compat_flags(super_block);
5646 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5647 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5649 if (copy_to_user(arg, &features, sizeof(features)))
5655 static int check_feature_bits(struct btrfs_fs_info *fs_info,
5656 enum btrfs_feature_set set,
5657 u64 change_mask, u64 flags, u64 supported_flags,
5658 u64 safe_set, u64 safe_clear)
5660 const char *type = btrfs_feature_set_names[set];
5662 u64 disallowed, unsupported;
5663 u64 set_mask = flags & change_mask;
5664 u64 clear_mask = ~flags & change_mask;
5666 unsupported = set_mask & ~supported_flags;
5668 names = btrfs_printable_features(set, unsupported);
5671 "this kernel does not support the %s feature bit%s",
5672 names, strchr(names, ',') ? "s" : "");
5676 "this kernel does not support %s bits 0x%llx",
5681 disallowed = set_mask & ~safe_set;
5683 names = btrfs_printable_features(set, disallowed);
5686 "can't set the %s feature bit%s while mounted",
5687 names, strchr(names, ',') ? "s" : "");
5691 "can't set %s bits 0x%llx while mounted",
5696 disallowed = clear_mask & ~safe_clear;
5698 names = btrfs_printable_features(set, disallowed);
5701 "can't clear the %s feature bit%s while mounted",
5702 names, strchr(names, ',') ? "s" : "");
5706 "can't clear %s bits 0x%llx while mounted",
5714 #define check_feature(fs_info, change_mask, flags, mask_base) \
5715 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
5716 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5717 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5718 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5720 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5722 struct inode *inode = file_inode(file);
5723 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5724 struct btrfs_root *root = BTRFS_I(inode)->root;
5725 struct btrfs_super_block *super_block = fs_info->super_copy;
5726 struct btrfs_ioctl_feature_flags flags[2];
5727 struct btrfs_trans_handle *trans;
5731 if (!capable(CAP_SYS_ADMIN))
5734 if (copy_from_user(flags, arg, sizeof(flags)))
5738 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5739 !flags[0].incompat_flags)
5742 ret = check_feature(fs_info, flags[0].compat_flags,
5743 flags[1].compat_flags, COMPAT);
5747 ret = check_feature(fs_info, flags[0].compat_ro_flags,
5748 flags[1].compat_ro_flags, COMPAT_RO);
5752 ret = check_feature(fs_info, flags[0].incompat_flags,
5753 flags[1].incompat_flags, INCOMPAT);
5757 ret = mnt_want_write_file(file);
5761 trans = btrfs_start_transaction(root, 0);
5762 if (IS_ERR(trans)) {
5763 ret = PTR_ERR(trans);
5764 goto out_drop_write;
5767 spin_lock(&fs_info->super_lock);
5768 newflags = btrfs_super_compat_flags(super_block);
5769 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5770 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5771 btrfs_set_super_compat_flags(super_block, newflags);
5773 newflags = btrfs_super_compat_ro_flags(super_block);
5774 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5775 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5776 btrfs_set_super_compat_ro_flags(super_block, newflags);
5778 newflags = btrfs_super_incompat_flags(super_block);
5779 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5780 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5781 btrfs_set_super_incompat_flags(super_block, newflags);
5782 spin_unlock(&fs_info->super_lock);
5784 ret = btrfs_commit_transaction(trans);
5786 mnt_drop_write_file(file);
5791 static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
5793 struct btrfs_ioctl_send_args *arg;
5797 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5798 struct btrfs_ioctl_send_args_32 args32;
5800 ret = copy_from_user(&args32, argp, sizeof(args32));
5803 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
5806 arg->send_fd = args32.send_fd;
5807 arg->clone_sources_count = args32.clone_sources_count;
5808 arg->clone_sources = compat_ptr(args32.clone_sources);
5809 arg->parent_root = args32.parent_root;
5810 arg->flags = args32.flags;
5811 memcpy(arg->reserved, args32.reserved,
5812 sizeof(args32.reserved));
5817 arg = memdup_user(argp, sizeof(*arg));
5819 return PTR_ERR(arg);
5821 ret = btrfs_ioctl_send(file, arg);
5826 long btrfs_ioctl(struct file *file, unsigned int
5827 cmd, unsigned long arg)
5829 struct inode *inode = file_inode(file);
5830 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5831 struct btrfs_root *root = BTRFS_I(inode)->root;
5832 void __user *argp = (void __user *)arg;
5835 case FS_IOC_GETFLAGS:
5836 return btrfs_ioctl_getflags(file, argp);
5837 case FS_IOC_SETFLAGS:
5838 return btrfs_ioctl_setflags(file, argp);
5839 case FS_IOC_GETVERSION:
5840 return btrfs_ioctl_getversion(file, argp);
5842 return btrfs_ioctl_fitrim(file, argp);
5843 case BTRFS_IOC_SNAP_CREATE:
5844 return btrfs_ioctl_snap_create(file, argp, 0);
5845 case BTRFS_IOC_SNAP_CREATE_V2:
5846 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5847 case BTRFS_IOC_SUBVOL_CREATE:
5848 return btrfs_ioctl_snap_create(file, argp, 1);
5849 case BTRFS_IOC_SUBVOL_CREATE_V2:
5850 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5851 case BTRFS_IOC_SNAP_DESTROY:
5852 return btrfs_ioctl_snap_destroy(file, argp);
5853 case BTRFS_IOC_SUBVOL_GETFLAGS:
5854 return btrfs_ioctl_subvol_getflags(file, argp);
5855 case BTRFS_IOC_SUBVOL_SETFLAGS:
5856 return btrfs_ioctl_subvol_setflags(file, argp);
5857 case BTRFS_IOC_DEFAULT_SUBVOL:
5858 return btrfs_ioctl_default_subvol(file, argp);
5859 case BTRFS_IOC_DEFRAG:
5860 return btrfs_ioctl_defrag(file, NULL);
5861 case BTRFS_IOC_DEFRAG_RANGE:
5862 return btrfs_ioctl_defrag(file, argp);
5863 case BTRFS_IOC_RESIZE:
5864 return btrfs_ioctl_resize(file, argp);
5865 case BTRFS_IOC_ADD_DEV:
5866 return btrfs_ioctl_add_dev(fs_info, argp);
5867 case BTRFS_IOC_RM_DEV:
5868 return btrfs_ioctl_rm_dev(file, argp);
5869 case BTRFS_IOC_RM_DEV_V2:
5870 return btrfs_ioctl_rm_dev_v2(file, argp);
5871 case BTRFS_IOC_FS_INFO:
5872 return btrfs_ioctl_fs_info(fs_info, argp);
5873 case BTRFS_IOC_DEV_INFO:
5874 return btrfs_ioctl_dev_info(fs_info, argp);
5875 case BTRFS_IOC_BALANCE:
5876 return btrfs_ioctl_balance(file, NULL);
5877 case BTRFS_IOC_TREE_SEARCH:
5878 return btrfs_ioctl_tree_search(file, argp);
5879 case BTRFS_IOC_TREE_SEARCH_V2:
5880 return btrfs_ioctl_tree_search_v2(file, argp);
5881 case BTRFS_IOC_INO_LOOKUP:
5882 return btrfs_ioctl_ino_lookup(file, argp);
5883 case BTRFS_IOC_INO_PATHS:
5884 return btrfs_ioctl_ino_to_path(root, argp);
5885 case BTRFS_IOC_LOGICAL_INO:
5886 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5887 case BTRFS_IOC_LOGICAL_INO_V2:
5888 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
5889 case BTRFS_IOC_SPACE_INFO:
5890 return btrfs_ioctl_space_info(fs_info, argp);
5891 case BTRFS_IOC_SYNC: {
5894 ret = btrfs_start_delalloc_roots(fs_info, -1);
5897 ret = btrfs_sync_fs(inode->i_sb, 1);
5899 * The transaction thread may want to do more work,
5900 * namely it pokes the cleaner kthread that will start
5901 * processing uncleaned subvols.
5903 wake_up_process(fs_info->transaction_kthread);
5906 case BTRFS_IOC_START_SYNC:
5907 return btrfs_ioctl_start_sync(root, argp);
5908 case BTRFS_IOC_WAIT_SYNC:
5909 return btrfs_ioctl_wait_sync(fs_info, argp);
5910 case BTRFS_IOC_SCRUB:
5911 return btrfs_ioctl_scrub(file, argp);
5912 case BTRFS_IOC_SCRUB_CANCEL:
5913 return btrfs_ioctl_scrub_cancel(fs_info);
5914 case BTRFS_IOC_SCRUB_PROGRESS:
5915 return btrfs_ioctl_scrub_progress(fs_info, argp);
5916 case BTRFS_IOC_BALANCE_V2:
5917 return btrfs_ioctl_balance(file, argp);
5918 case BTRFS_IOC_BALANCE_CTL:
5919 return btrfs_ioctl_balance_ctl(fs_info, arg);
5920 case BTRFS_IOC_BALANCE_PROGRESS:
5921 return btrfs_ioctl_balance_progress(fs_info, argp);
5922 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5923 return btrfs_ioctl_set_received_subvol(file, argp);
5925 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5926 return btrfs_ioctl_set_received_subvol_32(file, argp);
5928 case BTRFS_IOC_SEND:
5929 return _btrfs_ioctl_send(file, argp, false);
5930 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5931 case BTRFS_IOC_SEND_32:
5932 return _btrfs_ioctl_send(file, argp, true);
5934 case BTRFS_IOC_GET_DEV_STATS:
5935 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5936 case BTRFS_IOC_QUOTA_CTL:
5937 return btrfs_ioctl_quota_ctl(file, argp);
5938 case BTRFS_IOC_QGROUP_ASSIGN:
5939 return btrfs_ioctl_qgroup_assign(file, argp);
5940 case BTRFS_IOC_QGROUP_CREATE:
5941 return btrfs_ioctl_qgroup_create(file, argp);
5942 case BTRFS_IOC_QGROUP_LIMIT:
5943 return btrfs_ioctl_qgroup_limit(file, argp);
5944 case BTRFS_IOC_QUOTA_RESCAN:
5945 return btrfs_ioctl_quota_rescan(file, argp);
5946 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5947 return btrfs_ioctl_quota_rescan_status(file, argp);
5948 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5949 return btrfs_ioctl_quota_rescan_wait(file, argp);
5950 case BTRFS_IOC_DEV_REPLACE:
5951 return btrfs_ioctl_dev_replace(fs_info, argp);
5952 case BTRFS_IOC_GET_FSLABEL:
5953 return btrfs_ioctl_get_fslabel(file, argp);
5954 case BTRFS_IOC_SET_FSLABEL:
5955 return btrfs_ioctl_set_fslabel(file, argp);
5956 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5957 return btrfs_ioctl_get_supported_features(argp);
5958 case BTRFS_IOC_GET_FEATURES:
5959 return btrfs_ioctl_get_features(file, argp);
5960 case BTRFS_IOC_SET_FEATURES:
5961 return btrfs_ioctl_set_features(file, argp);
5962 case FS_IOC_FSGETXATTR:
5963 return btrfs_ioctl_fsgetxattr(file, argp);
5964 case FS_IOC_FSSETXATTR:
5965 return btrfs_ioctl_fssetxattr(file, argp);
5966 case BTRFS_IOC_GET_SUBVOL_INFO:
5967 return btrfs_ioctl_get_subvol_info(file, argp);
5968 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5969 return btrfs_ioctl_get_subvol_rootref(file, argp);
5970 case BTRFS_IOC_INO_LOOKUP_USER:
5971 return btrfs_ioctl_ino_lookup_user(file, argp);
5977 #ifdef CONFIG_COMPAT
5978 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5981 * These all access 32-bit values anyway so no further
5982 * handling is necessary.
5985 case FS_IOC32_GETFLAGS:
5986 cmd = FS_IOC_GETFLAGS;
5988 case FS_IOC32_SETFLAGS:
5989 cmd = FS_IOC_SETFLAGS;
5991 case FS_IOC32_GETVERSION:
5992 cmd = FS_IOC_GETVERSION;
5996 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));