xfs: only validate summary counts on primary superblock

Skip the summary counter checks for secondary superblocks and inprogress
primary superblocks because mkfs has always written those out with
zeroed summary counters.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>

fs/xfs/libxfs/xfs_sb.c

@@ -148,6 +148,7 @@ xfs_validate_sb_read(
 STATIC int
 xfs_validate_sb_write(
 	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
 	struct xfs_sb		*sbp)
 {
 	/*
@@ -155,10 +156,15 @@ xfs_validate_sb_write(
 	 * the superblock.  We skip this in the read validator because there
 	 * could be newer superblocks in the log and if the values are garbage
 	 * even after replay we'll recalculate them at the end of log mount.
+	 *
+	 * mkfs has traditionally written zeroed counters to inprogress and
+	 * secondary superblocks, so allow this usage to continue because
+	 * we never read counters from such superblocks.
 	 */
-	if (sbp->sb_fdblocks > sbp->sb_dblocks ||
+	if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
+	    (sbp->sb_fdblocks > sbp->sb_dblocks ||
 	     !xfs_verify_icount(mp, sbp->sb_icount) ||
-	    sbp->sb_ifree > sbp->sb_icount) {
+	     sbp->sb_ifree > sbp->sb_icount)) {
 		xfs_warn(mp, "SB summary counter sanity check failed");
 		return -EFSCORRUPTED;
 	}
@@ -756,7 +762,7 @@ xfs_sb_write_verify(
 	error = xfs_validate_sb_common(mp, bp, &sb);
 	if (error)
 		goto out_error;
-	error = xfs_validate_sb_write(mp, &sb);
+	error = xfs_validate_sb_write(mp, bp, &sb);
 	if (error)
 		goto out_error;