[PATCH 16/24] xfs: scrub should cross-reference with the bnobt

["Darrick J. Wong" <darrick.wong@oracle.com>]

When we're scrubbing various btrees, cross-reference the records with
the bnobt to ensure that we don't also think the space is free.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 libxfs/xfs_alloc.c |   19 +++++++++++++++++++
 libxfs/xfs_alloc.h |    3 +++
 2 files changed, 22 insertions(+)


diff --git a/libxfs/xfs_alloc.c b/libxfs/xfs_alloc.c
index 055d57e..96c6e2e 100644
--- a/libxfs/xfs_alloc.c
+++ b/libxfs/xfs_alloc.c
@@ -2970,3 +2970,22 @@ xfs_alloc_query_range(
 	return xfs_btree_query_range(cur, &low_brec, &high_brec,
 			xfs_alloc_query_range_helper, &query);
 }
+
+/* Is there a record covering a given extent? */
+int
+xfs_alloc_has_record(
+	struct xfs_btree_cur	*cur,
+	xfs_agblock_t		bno,
+	xfs_extlen_t		len,
+	bool			*exists)
+{
+	union xfs_btree_irec	low;
+	union xfs_btree_irec	high;
+
+	memset(&low, 0, sizeof(low));
+	low.a.ar_startblock = bno;
+	memset(&high, 0xFF, sizeof(high));
+	high.a.ar_startblock = bno + len - 1;
+
+	return xfs_btree_has_record(cur, &low, &high, exists);
+}
diff --git a/libxfs/xfs_alloc.h b/libxfs/xfs_alloc.h
index c3ada6b..b740456 100644
--- a/libxfs/xfs_alloc.h
+++ b/libxfs/xfs_alloc.h
@@ -222,4 +222,7 @@ int xfs_alloc_query_range(struct xfs_btree_cur *cur,
 		struct xfs_alloc_rec_incore *high_rec,
 		xfs_alloc_query_range_fn fn, void *priv);
 
+int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno,
+		xfs_extlen_t len, bool *exist);
+
 #endif	/* __XFS_ALLOC_H__ */

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