[PATCH 4/5] xfs: scrub should check incore counters against ondisk headers

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

From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

In theory, the incore per-AG structure counters should match the ones on
disk, so check that.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/scrub/agheader.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)


diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c
index ddf06bfaa29d..adaeabdefdd3 100644
--- a/fs/xfs/scrub/agheader.c
+++ b/fs/xfs/scrub/agheader.c
@@ -514,6 +514,7 @@ xchk_agf(
 {
 	struct xfs_mount	*mp = sc->mp;
 	struct xfs_agf		*agf;
+	struct xfs_perag	*pag;
 	xfs_agnumber_t		agno;
 	xfs_agblock_t		agbno;
 	xfs_agblock_t		eoag;
@@ -586,6 +587,16 @@ xchk_agf(
 	if (agfl_count != 0 && fl_count != agfl_count)
 		xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 
+	/* Do the incore counters match? */
+	pag = xfs_perag_get(mp, agno);
+	if (pag->pagf_freeblks != be32_to_cpu(agf->agf_freeblks))
+		xchk_block_set_corrupt(sc, sc->sa.agf_bp);
+	if (pag->pagf_flcount != be32_to_cpu(agf->agf_flcount))
+		xchk_block_set_corrupt(sc, sc->sa.agf_bp);
+	if (pag->pagf_btreeblks != be32_to_cpu(agf->agf_btreeblks))
+		xchk_block_set_corrupt(sc, sc->sa.agf_bp);
+	xfs_perag_put(pag);
+
 	xchk_agf_xref(sc);
 out:
 	return error;
@@ -811,6 +822,7 @@ xchk_agi(
 {
 	struct xfs_mount	*mp = sc->mp;
 	struct xfs_agi		*agi;
+	struct xfs_perag	*pag;
 	xfs_agnumber_t		agno;
 	xfs_agblock_t		agbno;
 	xfs_agblock_t		eoag;
@@ -881,6 +893,14 @@ xchk_agi(
 	if (agi->agi_pad32 != cpu_to_be32(0))
 		xchk_block_set_corrupt(sc, sc->sa.agi_bp);
 
+	/* Do the incore counters match? */
+	pag = xfs_perag_get(mp, agno);
+	if (pag->pagi_count != be32_to_cpu(agi->agi_count))
+		xchk_block_set_corrupt(sc, sc->sa.agi_bp);
+	if (pag->pagi_freecount != be32_to_cpu(agi->agi_freecount))
+		xchk_block_set_corrupt(sc, sc->sa.agi_bp);
+	xfs_perag_put(pag);
+
 	xchk_agi_xref(sc);
 out:
 	return error;