From: Darrick J. Wong <djwong@kernel.org>
Date: Fri, 23 Apr 2021 23:02:01 +0000 (-0700)
Subject: xfs: don't check agf_btreeblks on pre-lazysbcount filesystems
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e6c01077ec2d28fe8b6e0bc79eddea8d788f6ea3;p=linux.git

xfs: don't check agf_btreeblks on pre-lazysbcount filesystems

The AGF free space btree block counter wasn't added until the
lazysbcount feature was added to XFS midway through the life of the V4
format, so ignore the field when checking.  Online AGF repair requires
rmapbt, so it doesn't need the feature check.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
---

diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c
index 749faa17f8e2f..7a2f9b5f2db5b 100644
--- a/fs/xfs/scrub/agheader.c
+++ b/fs/xfs/scrub/agheader.c
@@ -416,6 +416,10 @@ xchk_agf_xref_btreeblks(
 	xfs_agblock_t		btreeblks;
 	int			error;
 
+	/* agf_btreeblks didn't exist before lazysbcount */
+	if (!xfs_sb_version_haslazysbcount(&sc->mp->m_sb))
+		return;
+
 	/* Check agf_rmap_blocks; set up for agf_btreeblks check */
 	if (sc->sa.rmap_cur) {
 		error = xfs_btree_count_blocks(sc->sa.rmap_cur, &blocks);
@@ -581,7 +585,8 @@ xchk_agf(
 		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))
+	if (xfs_sb_version_haslazysbcount(&sc->mp->m_sb) &&
+	    pag->pagf_btreeblks != be32_to_cpu(agf->agf_btreeblks))
 		xchk_block_set_corrupt(sc, sc->sa.agf_bp);
 	xfs_perag_put(pag);
 
diff --git a/fs/xfs/scrub/fscounters.c b/fs/xfs/scrub/fscounters.c
index 7b4386c78fbf3..318b81c0f90d3 100644
--- a/fs/xfs/scrub/fscounters.c
+++ b/fs/xfs/scrub/fscounters.c
@@ -182,7 +182,8 @@ retry:
 		/* Add up the free/freelist/bnobt/cntbt blocks */
 		fsc->fdblocks += pag->pagf_freeblks;
 		fsc->fdblocks += pag->pagf_flcount;
-		fsc->fdblocks += pag->pagf_btreeblks;
+		if (xfs_sb_version_haslazysbcount(&sc->mp->m_sb))
+			fsc->fdblocks += pag->pagf_btreeblks;
 
 		/*
 		 * Per-AG reservations are taken out of the incore counters,