// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017-2023 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <[email protected]>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/trace.h"
/* btree scrubbing */
/*
* Check for btree operation errors. See the section about handling
* operational errors in common.c.
*/
static bool
__xchk_btree_process_error(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
int level,
int *error,
__u32 errflag,
void *ret_ip)
{
if (*error == 0)
return true;
switch (*error) {
case -EDEADLOCK:
case -ECHRNG:
/* Used to restart an op with deadlock avoidance. */
trace_xchk_deadlock_retry(sc->ip, sc->sm, *error);
break;
case -EFSBADCRC:
case -EFSCORRUPTED:
/* Note the badness but don't abort. */
sc->sm->sm_flags |= errflag;
*error = 0;
fallthrough;
default:
if (cur->bc_ops->type == XFS_BTREE_TYPE_INODE)
trace_xchk_ifork_btree_op_error(sc, cur, level,
*error, ret_ip);
else
trace_xchk_btree_op_error(sc, cur, level,
*error, ret_ip);
break;
}
return false;
}
bool
xchk_btree_process_error(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
int level,
int *error)
{
return __xchk_btree_process_error(sc, cur, level, error,
XFS_SCRUB_OFLAG_CORRUPT, __return_address);
}
bool
xchk_btree_xref_process_error(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
int level,
int *error)
{
return __xchk_btree_process_error(sc, cur, level, error,
XFS_SCRUB_OFLAG_XFAIL, __return_address);
}
/* Record btree block corruption. */
static void
__xchk_btree_set_corrupt(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
int level,
__u32 errflag,
void *ret_ip)
{
sc->sm->sm_flags |= errflag;
if (cur->bc_ops->type == XFS_BTREE_TYPE_INODE)
trace_xchk_ifork_btree_error(sc, cur, level,
ret_ip);
else
trace_xchk_btree_error(sc, cur, level,
ret_ip);
}
void
xchk_btree_set_corrupt(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
int level)
{
__xchk_btree_set_corrupt(sc, cur, level, XFS_SCRUB_OFLAG_CORRUPT,
__return_address);
}
void
xchk_btree_xref_set_corrupt(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
int level)
{
__xchk_btree_set_corrupt(sc, cur, level, XFS_SCRUB_OFLAG_XCORRUPT,
__return_address);
}
void
xchk_btree_set_preen(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
int level)
{
__xchk_btree_set_corrupt(sc, cur, level, XFS_SCRUB_OFLAG_PREEN,
__return_address);
}
/*
* Make sure this record is in order and doesn't stray outside of the parent
* keys.
*/
STATIC void
xchk_btree_rec(
struct xchk_btree *bs)
{
struct xfs_btree_cur *cur = bs->cur;
union xfs_btree_rec *rec;
union xfs_btree_key key;
union xfs_btree_key hkey;
union xfs_btree_key *keyp;
struct xfs_btree_block *block;
struct xfs_btree_block *keyblock;
struct xfs_buf *bp;
block = xfs_btree_get_block(cur, 0, &bp);
rec = xfs_btree_rec_addr(cur, cur->bc_levels[0].ptr, block);
trace_xchk_btree_rec(bs->sc, cur, 0);
/* Are all records across all record blocks in order? */
if (bs->lastrec_valid &&
!cur->bc_ops->recs_inorder(cur, &bs->lastrec, rec))
xchk_btree_set_corrupt(bs->sc, cur, 0);
memcpy(&bs->lastrec, rec, cur->bc_ops->rec_len);
bs->lastrec_valid = true;
if (cur->bc_nlevels == 1)
return;
/* Is low_key(rec) at least as large as the parent low key? */
cur->bc_ops->init_key_from_rec(&key, rec);
keyblock = xfs_btree_get_block(cur, 1, &bp);
keyp = xfs_btree_key_addr(cur, cur->bc_levels[1].ptr, keyblock);
if (xfs_btree_keycmp_lt(cur, &key, keyp))
xchk_btree_set_corrupt(bs->sc, cur, 1);
if (!(cur->bc_ops->geom_flags & XFS_BTGEO_OVERLAPPING))
return;
/* Is high_key(rec) no larger than the parent high key? */
cur->bc_ops->init_high_key_from_rec(&hkey, rec);
keyp = xfs_btree_high_key_addr(cur, cur->bc_levels[1].ptr, keyblock);
if (xfs_btree_keycmp_lt(cur, keyp, &hkey))
xchk_btree_set_corrupt(bs->sc, cur, 1);
}
/*
* Make sure this key is in order and doesn't stray outside of the parent
* keys.
*/
STATIC void
xchk_btree_key(
struct xchk_btree *bs,
int level)
{
struct xfs_btree_cur *cur = bs->cur;
union xfs_btree_key *key;
union xfs_btree_key *keyp;
struct xfs_btree_block *block;
struct xfs_btree_block *keyblock;
struct xfs_buf *bp;
block = xfs_btree_get_block(cur, level, &bp);
key = xfs_btree_key_addr(cur, cur->bc_levels[level].ptr, block);
trace_xchk_btree_key(bs->sc, cur, level);
/* Are all low keys across all node blocks in order? */
if (bs->lastkey[level - 1].valid &&
!cur->bc_ops->keys_inorder(cur, &bs->lastkey[level - 1].key, key))
xchk_btree_set_corrupt(bs->sc, cur, level);
memcpy(&bs->lastkey[level - 1].key, key, cur->bc_ops->key_len);
bs->lastkey[level - 1].valid = true;
if (level + 1 >= cur->bc_nlevels)
return;
/* Is this block's low key at least as large as the parent low key? */
keyblock = xfs_btree_get_block(cur, level + 1, &bp);
keyp = xfs_btree_key_addr(cur, cur->bc_levels[level + 1].ptr, keyblock);
if (xfs_btree_keycmp_lt(cur, key, keyp))
xchk_btree_set_corrupt(bs->sc, cur, level);
if (!(cur->bc_ops->geom_flags & XFS_BTGEO_OVERLAPPING))
return;
/* Is this block's high key no larger than the parent high key? */
key = xfs_btree_high_key_addr(cur, cur->bc_levels[level].ptr, block);
keyp = xfs_btree_high_key_addr(cur, cur->bc_levels[level + 1].ptr,
keyblock);
if (xfs_btree_keycmp_lt(cur, keyp, key))
xchk_btree_set_corrupt(bs->sc, cur, level);
}
/*
* Check a btree pointer. Returns true if it's ok to use this pointer.
* Callers do not need to set the corrupt flag.
*/
static bool
xchk_btree_ptr_ok(
struct xchk_btree *bs,
int level,
union xfs_btree_ptr *ptr)
{
/* A btree rooted in an inode has no block pointer to the root. */
if (bs->cur->bc_ops->type == XFS_BTREE_TYPE_INODE &&
level == bs->cur->bc_nlevels)
return true;
/* Otherwise, check the pointers. */
if (__xfs_btree_check_ptr(bs->cur, ptr, 0, level)) {
xchk_btree_set_corrupt(bs->sc, bs->cur, level);
return false;
}
return true;
}
/* Check that a btree block's sibling matches what we expect it. */
STATIC int
xchk_btree_block_check_sibling(
struct xchk_btree *bs,
int level,
int direction,
union xfs_btree_ptr *sibling)
{
struct xfs_btree_cur *cur = bs->cur;
struct xfs_btree_block *pblock;
struct xfs_buf *pbp;
struct xfs_btree_cur *ncur = NULL;
union xfs_btree_ptr *pp;
int success;
int error;
error = xfs_btree_dup_cursor(cur, &ncur);
if (!xchk_btree_process_error(bs->sc, cur, level + 1, &error) ||
!ncur)
return error;
/*
* If the pointer is null, we shouldn't be able to move the upper
* level pointer anywhere.
*/
if (xfs_btree_ptr_is_null(cur, sibling)) {
if (direction > 0)
error = xfs_btree_increment(ncur, level + 1, &success);
else
error = xfs_btree_decrement(ncur, level + 1, &success);
if (error == 0 && success)
xchk_btree_set_corrupt(bs->sc, cur, level);
error = 0;
goto out;
}
/* Increment upper level pointer. */
if (direction > 0)
error = xfs_btree_increment(ncur, level + 1, &success);
else
error = xfs_btree_decrement(ncur, level + 1, &success);
if (!xchk_btree_process_error(bs->sc, cur, level + 1, &error))
goto out;
if (!success) {
xchk_btree_set_corrupt(bs->sc, cur, level + 1);
goto out;
}
/* Compare upper level pointer to sibling pointer. */
pblock = xfs_btree_get_block(ncur, level + 1, &pbp);
pp = xfs_btree_ptr_addr(ncur, ncur->bc_levels[level + 1].ptr, pblock);
if (!xchk_btree_ptr_ok(bs, level + 1, pp))
goto out;
if (pbp)
xchk_buffer_recheck(bs->sc, pbp);
if (xfs_btree_diff_two_ptrs(cur, pp, sibling))
xchk_btree_set_corrupt(bs->sc, cur, level);
out:
xfs_btree_del_cursor(ncur, XFS_BTREE_ERROR);
return error;
}
/* Check the siblings of a btree block. */
STATIC int
xchk_btree_block_check_siblings(
struct xchk_btree *bs,
struct xfs_btree_block *block)
{
struct xfs_btree_cur *cur = bs->cur;
union xfs_btree_ptr leftsib;
union xfs_btree_ptr rightsib;
int level;
int error = 0;
xfs_btree_get_sibling(cur, block, &leftsib, XFS_BB_LEFTSIB);
xfs_btree_get_sibling(cur, block, &rightsib, XFS_BB_RIGHTSIB);
level = xfs_btree_get_level(block);
/* Root block should never have siblings. */
if (level == cur->bc_nlevels - 1) {
if (!xfs_btree_ptr_is_null(cur, &leftsib) ||
!xfs_btree_ptr_is_null(cur, &rightsib))
xchk_btree_set_corrupt(bs->sc, cur, level);
goto out;
}
/*
* Does the left & right sibling pointers match the adjacent
* parent level pointers?
* (These function absorbs error codes for us.)
*/
error = xchk_btree_block_check_sibling(bs, level, -1, &leftsib);
if (error)
return error;
error = xchk_btree_block_check_sibling(bs, level, 1, &rightsib);
if (error)
return error;
out:
return error;
}
struct check_owner {
struct list_head list;
xfs_daddr_t daddr;
int level;
};
/*
* Make sure this btree block isn't in the free list and that there's
* an rmap record for it.
*/
STATIC int
xchk_btree_check_block_owner(
struct xchk_btree *bs,
int level,
xfs_daddr_t daddr)
{
xfs_agnumber_t agno;
xfs_agblock_t agbno;
bool init_sa;
int error = 0;
if (!bs->cur)
return 0;
agno = xfs_daddr_to_agno(bs->cur->bc_mp, daddr);
agbno = xfs_daddr_to_agbno(bs->cur->bc_mp, daddr);
/*
* If the btree being examined is not itself a per-AG btree, initialize
* sc->sa so that we can check for the presence of an ownership record
* in the rmap btree for the AG containing the block.
*/
init_sa = bs->cur->bc_ops->type != XFS_BTREE_TYPE_AG;
if (init_sa) {
error = xchk_ag_init_existing(bs->sc, agno, &bs->sc->sa);
if (!xchk_btree_xref_process_error(bs->sc, bs->cur,
level, &error))
goto out_free;
}
xchk_xref_is_used_space(bs->sc, agbno, 1);
/*
* The bnobt scrubber aliases bs->cur to bs->sc->sa.bno_cur, so we
* have to nullify it (to shut down further block owner checks) if
* self-xref encounters problems.
*/
if (!bs->sc->sa.bno_cur && xfs_btree_is_bno(bs->cur->bc_ops))
bs->cur = NULL;
xchk_xref_is_only_owned_by(bs->sc, agbno, 1, bs->oinfo);
if (!bs->sc->sa.rmap_cur && xfs_btree_is_rmap(bs->cur->bc_ops))
bs->cur = NULL;
out_free:
if (init_sa)
xchk_ag_free(bs->sc, &bs->sc->sa);
return error;
}
/* Check the owner of a btree block. */
STATIC int
xchk_btree_check_owner(
struct xchk_btree *bs,
int level,
struct xfs_buf *bp)
{
struct xfs_btree_cur *cur = bs->cur;
/*
* In theory, xfs_btree_get_block should only give us a null buffer
* pointer for the root of a root-in-inode btree type, but we need
* to check defensively here in case the cursor state is also screwed
* up.
*/
if (bp == NULL) {
if (cur->bc_ops->type != XFS_BTREE_TYPE_INODE)
xchk_btree_set_corrupt(bs->sc, bs->cur, level);
return 0;
}
/*
* We want to cross-reference each btree block with the bnobt
* and the rmapbt. We cannot cross-reference the bnobt or
* rmapbt while scanning the bnobt or rmapbt, respectively,
* because we cannot alter the cursor and we'd prefer not to
* duplicate cursors. Therefore, save the buffer daddr for
* later scanning.
*/
if (xfs_btree_is_bno(cur->bc_ops) || xfs_btree_is_rmap(cur->bc_ops)) {
struct check_owner *co;
co = kmalloc(sizeof(struct check_owner), XCHK_GFP_FLAGS);
if (!co)
return -ENOMEM;
INIT_LIST_HEAD(&co->list);
co->level = level;
co->daddr = xfs_buf_daddr(bp);
list_add_tail(&co->list, &bs->to_check);
return 0;
}
return xchk_btree_check_block_owner(bs, level, xfs_buf_daddr(bp));
}
/* Decide if we want to check minrecs of a btree block in the inode root. */
static inline bool
xchk_btree_check_iroot_minrecs(
struct xchk_btree *bs)
{
/*
* xfs_bmap_add_attrfork_btree had an implementation bug wherein it
* would miscalculate the space required for the data fork bmbt root
* when adding an attr fork, and promote the iroot contents to an
* external block unnecessarily. This went unnoticed for many years
* until scrub found filesystems in this state. Inode rooted btrees are
* not supposed to have immediate child blocks that are small enough
* that the contents could fit in the inode root, but we can't fail
* existing filesystems, so instead we disable the check for data fork
* bmap btrees when there's an attr fork.
*/
if (xfs_btree_is_bmap(bs->cur->bc_ops) &&
bs->cur->bc_ino.whichfork == XFS_DATA_FORK &&
xfs_inode_has_attr_fork(bs->sc->ip))
return false;
return true;
}
/*
* Check that this btree block has at least minrecs records or is one of the
* special blocks that don't require that.
*/
STATIC void
xchk_btree_check_minrecs(
struct xchk_btree *bs,
int level,
struct xfs_btree_block *block)
{
struct xfs_btree_cur *cur = bs->cur;
unsigned int root_level = cur->bc_nlevels - 1;
unsigned int numrecs = be16_to_cpu(block->bb_numrecs);
/* More records than minrecs means the block is ok. */
if (numrecs >= cur->bc_ops->get_minrecs(cur, level))
return;
/*
* For btrees rooted in the inode, it's possible that the root block
* contents spilled into a regular ondisk block because there wasn't
* enough space in the inode root. The number of records in that
* child block might be less than the standard minrecs, but that's ok
* provided that there's only one direct child of the root.
*/
if (cur->bc_ops->type == XFS_BTREE_TYPE_INODE &&
level == cur->bc_nlevels - 2) {
struct xfs_btree_block *root_block;
struct xfs_buf *root_bp;
int root_maxrecs;
root_block = xfs_btree_get_block(cur, root_level, &root_bp);
root_maxrecs = cur->bc_ops->get_dmaxrecs(cur, root_level);
if (xchk_btree_check_iroot_minrecs(bs) &&
(be16_to_cpu(root_block->bb_numrecs) != 1 ||
numrecs <= root_maxrecs))
xchk_btree_set_corrupt(bs->sc, cur, level);
return;
}
/*
* Otherwise, only the root level is allowed to have fewer than minrecs
* records or keyptrs.
*/
if (level < root_level)
xchk_btree_set_corrupt(bs->sc, cur, level);
}
/*
* If this btree block has a parent, make sure that the parent's keys capture
* the keyspace contained in this block.
*/
STATIC void
xchk_btree_block_check_keys(
struct xchk_btree *bs,
int level,
struct xfs_btree_block *block)
{
union xfs_btree_key block_key;
union xfs_btree_key *block_high_key;
union xfs_btree_key *parent_low_key, *parent_high_key;
struct xfs_btree_cur *cur = bs->cur;
struct xfs_btree_block *parent_block;
struct xfs_buf *bp;
if (level == cur->bc_nlevels - 1)
return;
xfs_btree_get_keys(cur, block, &block_key);
/* Make sure the low key of this block matches the parent. */
parent_block = xfs_btree_get_block(cur, level + 1, &bp);
parent_low_key = xfs_btree_key_addr(cur, cur->bc_levels[level + 1].ptr,
parent_block);
if (xfs_btree_keycmp_ne(cur, &block_key, parent_low_key)) {
xchk_btree_set_corrupt(bs->sc, bs->cur, level);
return;
}
if (!(cur->bc_ops->geom_flags & XFS_BTGEO_OVERLAPPING))
return;
/* Make sure the high key of this block matches the parent. */
parent_high_key = xfs_btree_high_key_addr(cur,
cur->bc_levels[level + 1].ptr, parent_block);
block_high_key = xfs_btree_high_key_from_key(cur, &block_key);
if (xfs_btree_keycmp_ne(cur, block_high_key, parent_high_key))
xchk_btree_set_corrupt(bs->sc, bs->cur, level);
}
/*
* Grab and scrub a btree block given a btree pointer. Returns block
* and buffer pointers (if applicable) if they're ok to use.
*/
STATIC int
xchk_btree_get_block(
struct xchk_btree *bs,
int level,
union xfs_btree_ptr *pp,
struct xfs_btree_block **pblock,
struct xfs_buf **pbp)
{
int error;
*pblock = NULL;
*pbp = NULL;
error = xfs_btree_lookup_get_block(bs->cur, level, pp, pblock);
if (!xchk_btree_process_error(bs->sc, bs->cur, level, &error) ||
!*pblock)
return error;
xfs_btree_get_block(bs->cur, level, pbp);
if (__xfs_btree_check_block(bs->cur, *pblock, level, *pbp)) {
xchk_btree_set_corrupt(bs->sc, bs->cur, level);
return 0;
}
if (*pbp)
xchk_buffer_recheck(bs->sc, *pbp);
xchk_btree_check_minrecs(bs, level, *pblock);
/*
* Check the block's owner; this function absorbs error codes
* for us.
*/
error = xchk_btree_check_owner(bs, level, *pbp);
if (error)
return error;
/*
* Check the block's siblings; this function absorbs error codes
* for us.
*/
error = xchk_btree_block_check_siblings(bs, *pblock);
if (error)
return error;
xchk_btree_block_check_keys(bs, level, *pblock);
return 0;
}
/*
* Check that the low and high keys of this block match the keys stored
* in the parent block.
*/
STATIC void
xchk_btree_block_keys(
struct xchk_btree *bs,
int level,
struct xfs_btree_block *block)
{
union xfs_btree_key block_keys;
struct xfs_btree_cur *cur = bs->cur;
union xfs_btree_key *high_bk;
union xfs_btree_key *parent_keys;
union xfs_btree_key *high_pk;
struct xfs_btree_block *parent_block;
struct xfs_buf *bp;
if (level >= cur->bc_nlevels - 1)
return;
/* Calculate the keys for this block. */
xfs_btree_get_keys(cur, block, &block_keys);
/* Obtain the parent's copy of the keys for this block. */
parent_block = xfs_btree_get_block(cur, level + 1, &bp);
parent_keys = xfs_btree_key_addr(cur, cur->bc_levels[level + 1].ptr,
parent_block);
if (xfs_btree_keycmp_ne(cur, &block_keys, parent_keys))
xchk_btree_set_corrupt(bs->sc, cur, 1);
if (!(cur->bc_ops->geom_flags & XFS_BTGEO_OVERLAPPING))
return;
/* Get high keys */
high_bk = xfs_btree_high_key_from_key(cur, &block_keys);
high_pk = xfs_btree_high_key_addr(cur, cur->bc_levels[level + 1].ptr,
parent_block);
if (xfs_btree_keycmp_ne(cur, high_bk, high_pk))
xchk_btree_set_corrupt(bs->sc, cur, 1);
}
/*
* Visit all nodes and leaves of a btree. Check that all pointers and
* records are in order, that the keys reflect the records, and use a callback
* so that the caller can verify individual records.
*/
int
xchk_btree(
struct xfs_scrub *sc,
struct xfs_btree_cur *cur,
xchk_btree_rec_fn scrub_fn,
const struct xfs_owner_info *oinfo,
void *private)
{
union xfs_btree_ptr ptr;
struct xchk_btree *bs;
union xfs_btree_ptr *pp;
union xfs_btree_rec *recp;
struct xfs_btree_block *block;
struct xfs_buf *bp;
struct check_owner *co;
struct check_owner *n;
size_t cur_sz;
int level;
int error = 0;
/*
* Allocate the btree scrub context from the heap, because this
* structure can get rather large. Don't let a caller feed us a
* totally absurd size.
*/
cur_sz = xchk_btree_sizeof(cur->bc_nlevels);
if (cur_sz > PAGE_SIZE) {
xchk_btree_set_corrupt(sc, cur, 0);
return 0;
}
bs = kzalloc(cur_sz, XCHK_GFP_FLAGS);
if (!bs)
return -ENOMEM;
bs->cur = cur;
bs->scrub_rec = scrub_fn;
bs->oinfo = oinfo;
bs->private = private;
bs->sc = sc;
/* Initialize scrub state */
INIT_LIST_HEAD(&bs->to_check);
/*
* Load the root of the btree. The helper function absorbs
* error codes for us.
*/
level = cur->bc_nlevels - 1;
xfs_btree_init_ptr_from_cur(cur, &ptr);
if (!xchk_btree_ptr_ok(bs, cur->bc_nlevels, &ptr))
goto out;
error = xchk_btree_get_block(bs, level, &ptr, &block, &bp);
if (error || !block)
goto out;
cur->bc_levels[level].ptr = 1;
while (level < cur->bc_nlevels) {
block = xfs_btree_get_block(cur, level, &bp);
if (level == 0) {
/* End of leaf, pop back towards the root. */
if (cur->bc_levels[level].ptr >
be16_to_cpu(block->bb_numrecs)) {
xchk_btree_block_keys(bs, level, block);
if (level < cur->bc_nlevels - 1)
cur->bc_levels[level + 1].ptr++;
level++;
continue;
}
/* Records in order for scrub? */
xchk_btree_rec(bs);
/* Call out to the record checker. */
recp = xfs_btree_rec_addr(cur, cur->bc_levels[0].ptr,
block);
error = bs->scrub_rec(bs, recp);
if (error)
break;
if (xchk_should_terminate(sc, &error) ||
(sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
break;
cur->bc_levels[level].ptr++;
continue;
}
/* End of node, pop back towards the root. */
if (cur->bc_levels[level].ptr >
be16_to_cpu(block->bb_numrecs)) {
xchk_btree_block_keys(bs, level, block);
if (level < cur->bc_nlevels - 1)
cur->bc_levels[level + 1].ptr++;
level++;
continue;
}
/* Keys in order for scrub? */
xchk_btree_key(bs, level);
/* Drill another level deeper. */
pp = xfs_btree_ptr_addr(cur, cur->bc_levels[level].ptr, block);
if (!xchk_btree_ptr_ok(bs, level, pp)) {
cur->bc_levels[level].ptr++;
continue;
}
level--;
error = xchk_btree_get_block(bs, level, pp, &block, &bp);
if (error || !block)
goto out;
cur->bc_levels[level].ptr = 1;
}
out:
/* Process deferred owner checks on btree blocks. */
list_for_each_entry_safe(co, n, &bs->to_check, list) {
if (!error && bs->cur)
error = xchk_btree_check_block_owner(bs, co->level,
co->daddr);
list_del(&co->list);
kfree(co);
}
kfree(bs);
return error;
}
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