From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Fri, 5 Oct 2018 02:36:11 +0000 (-0500)
Subject: xfs: only validate summary counts on primary superblock
X-Git-Tag: v4.19.0-rc0~23
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc226d36595d57c4ce28022730e25bdc5162d02a;p=thirdparty%2Fxfsprogs-dev.git

xfs: only validate summary counts on primary superblock

Source kernel commit: 1f31c98d650ca342e2f54cb17c4554ad110c5a11

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>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
---

diff --git a/libxfs/xfs_sb.c b/libxfs/xfs_sb.c
index 35b4dadeb..37207d9c5 100644
--- a/libxfs/xfs_sb.c
+++ b/libxfs/xfs_sb.c
@@ -145,6 +145,7 @@ xfs_validate_sb_read(
 STATIC int
 xfs_validate_sb_write(
 	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
 	struct xfs_sb		*sbp)
 {
 	/*
@@ -152,10 +153,15 @@ 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 ||
-	    !xfs_verify_icount(mp, sbp->sb_icount) ||
-	    sbp->sb_ifree > sbp->sb_icount) {
+	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)) {
 		xfs_warn(mp, "SB summary counter sanity check failed");
 		return -EFSCORRUPTED;
 	}
@@ -700,7 +706,7 @@ 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;