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xfs: don't track firstrec/firstkey separately in xchk_btree

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The btree scrubbing code checks that the records (or keys) that it finds
in a btree block are all in order by calling the btree cursor's
->recs_inorder function.  This of course makes no sense for the first
item in the block, so we switch that off with a separate variable in
struct xchk_btree.

Christoph helped me figure out that the variable is unnecessary, since
we just accessed bc_ptrs[level] and can compare that against zero.  Use
that, and save ourselves some memory space.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2021-09-22 09:28:53 -07:00
parent efb79ea310
commit d47fef9342
2 changed files with 3 additions and 10 deletions
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11
fs/xfs/scrub/btree.c
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@ -141,9 +141,9 @@ xchk_btree_rec(
trace_xchk_btree_rec(bs->sc, cur, 0);
/* If this isn't the first record, are they in order? */
if (!bs->firstrec && !cur->bc_ops->recs_inorder(cur, &bs->lastrec, rec))
if (cur->bc_ptrs[0] > 1 &&
!cur->bc_ops->recs_inorder(cur, &bs->lastrec, rec))
xchk_btree_set_corrupt(bs->sc, cur, 0);
bs->firstrec = false;
memcpy(&bs->lastrec, rec, cur->bc_ops->rec_len);
if (cur->bc_nlevels == 1)
@ -188,10 +188,9 @@ xchk_btree_key(
trace_xchk_btree_key(bs->sc, cur, level);
/* If this isn't the first key, are they in order? */
if (!bs->firstkey[level] &&
if (cur->bc_ptrs[level] > 1 &&
!cur->bc_ops->keys_inorder(cur, &bs->lastkey[level], key))
xchk_btree_set_corrupt(bs->sc, cur, level);
bs->firstkey[level] = false;
memcpy(&bs->lastkey[level], key, cur->bc_ops->key_len);
if (level + 1 >= cur->bc_nlevels)
@ -636,7 +635,6 @@ xchk_btree(
struct xfs_buf *bp;
struct check_owner *co;
struct check_owner *n;
int i;
int error = 0;
/*
@ -649,13 +647,10 @@ xchk_btree(
bs->cur = cur;
bs->scrub_rec = scrub_fn;
bs->oinfo = oinfo;
bs->firstrec = true;
bs->private = private;
bs->sc = sc;
/* Initialize scrub state */
for (i = 0; i < XFS_BTREE_MAXLEVELS; i++)
bs->firstkey[i] = true;
INIT_LIST_HEAD(&bs->to_check);
/* Don't try to check a tree with a height we can't handle. */

2
fs/xfs/scrub/btree.h
View File

@ -39,9 +39,7 @@ struct xchk_btree {
/* internal scrub state */
union xfs_btree_rec lastrec;
bool firstrec;
union xfs_btree_key lastkey[XFS_BTREE_MAXLEVELS];
bool firstkey[XFS_BTREE_MAXLEVELS];
struct list_head to_check;
};
int xchk_btree(struct xfs_scrub *sc, struct xfs_btree_cur *cur,