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Date:   Wed, 31 May 2017 09:08:17 -0400
From:   Jeff Layton <>
Cc:     Andrew Morton <>,
        Al Viro <>, Jan Kara <>,,,,,,,,,,,
Subject: [xfstests PATCH v3 2/5] ext4: allow ext4 to use $SCRATCH_LOGDEV

The writeback error handling test requires that you put the journal on a
separate device. This allows us to use dmerror to simulate data
writeback failure, without affecting the journal.

xfs already has infrastructure for this (a'la $SCRATCH_LOGDEV), so wire
up the ext4 code so that it can do the same thing when _scratch_mkfs is

Signed-off-by: Jeff Layton <>
Reviewed-by: Darrick J. Wong <>
 common/rc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/rc b/common/rc
index 743df427c047..391d36f373cd 100644
--- a/common/rc
+++ b/common/rc
@@ -676,6 +676,9 @@ _scratch_mkfs_ext4()
 	local tmp=`mktemp`
 	local mkfs_status
+	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
+	    $mkfs_cmd -O journal_dev $SCRATCH_LOGDEV && \
+	    mkfs_cmd="$mkfs_cmd -J device=$SCRATCH_LOGDEV"
 	_scratch_do_mkfs "$mkfs_cmd" "$mkfs_filter" $* 2>$tmp.mkfserr 1>$tmp.mkfsstd

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