From 342ec632217b46a0a049d79906aef4cc5fdefb7d Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Mon, 9 Jan 2017 20:17:39 -0600
Subject: [PATCH] xfs: check minimum block size for CRC filesystems

Source kernel commit: bec9d48d7a303a5bb95c05961ff07ec7eeb59058

[dchinner: cleaned up XFS_MIN_CRC_BLOCKSIZE check]

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
---
 libxfs/xfs_sb.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libxfs/xfs_sb.c b/libxfs/xfs_sb.c
index adc47e210..39ce4d2cc 100644
--- a/libxfs/xfs_sb.c
+++ b/libxfs/xfs_sb.c
@@ -259,6 +259,12 @@ xfs_mount_validate_sb(
 		return -EFSCORRUPTED;
 	}
 
+	if (xfs_sb_version_hascrc(&mp->m_sb) &&
+	    sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
+		xfs_notice(mp, "v5 SB sanity check failed");
+		return -EFSCORRUPTED;
+	}
+
 	/*
 	 * Currently only very few inode sizes are supported.
 	 */
-- 
2.47.2