[04/16] common/ext4: reformat external logs during mdrestore operations

Commit Message

Darrick J. Wong Oct. 11, 2024, 1:42 a.m. UTC

From: Darrick J. Wong <[e-mail]>

The e2image file format doesn't support the capture of external log
devices, which means that mdrestore ought to reformat the external log
to get the restored filesystem to work again.  The common/populate code
could already do this, so push it to the common ext4 helper.

While we're at it, fix the uncareful usage of SCRATCH_LOGDEV in the
populate code.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 common/ext4     |   17 ++++++++++++++++-
 common/populate |   18 +++++-------------
 2 files changed, 21 insertions(+), 14 deletions(-)

Patch

diff --git a/common/ext4 b/common/ext4
index 13921bb8165a4d..e1b336d3d20cba 100644
--- a/common/ext4
+++ b/common/ext4
@@ -134,7 +134,8 @@  _ext4_mdrestore()
 {
 	local metadump="$1"
 	local device="$2"
-	shift; shift
+	local logdev="$3"
+	shift; shift; shift
 	local options="$@"
 
 	# If we're configured for compressed dumps and there isn't already an
@@ -148,6 +149,20 @@  _ext4_mdrestore()
 	test -r "$metadump" || return 1
 
 	$E2IMAGE_PROG $options -r "${metadump}" "${SCRATCH_DEV}"
+	res=$?
+	test $res -ne 0 && return $res
+
+	# ext4 cannot e2image external logs, so we have to reformat the log
+	# device to match the restored fs
+	if [ "${logdev}" != "none" ]; then
+		local fsuuid="$($DUMPE2FS_PROG -h "${SCRATCH_DEV}" 2>/dev/null | \
+				grep 'Journal UUID:' | \
+				sed -e 's/Journal UUID:[[:space:]]*//g')"
+		$MKFS_EXT4_PROG -O journal_dev "${logdev}" \
+				-F -U "${fsuuid}"
+		res=$?
+	fi
+	return $res
 }
 
 # this test requires the ext4 kernel support crc feature on scratch device
diff --git a/common/populate b/common/populate
index 94ee7af9ba1c95..ed3ee85ee2b6db 100644
--- a/common/populate
+++ b/common/populate
@@ -1021,20 +1021,12 @@  _scratch_populate_restore_cached() {
 		return $?
 		;;
 	"ext2"|"ext3"|"ext4")
-		_ext4_mdrestore "${metadump}" "${SCRATCH_DEV}"
-		ret=$?
-		test $ret -ne 0 && return $ret
+		local logdev=none
+		[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
+			logdev=$SCRATCH_LOGDEV
 
-		# ext4 cannot e2image external logs, so we have to reformat
-		# the scratch device to match the restored fs
-		if [ -n "${SCRATCH_LOGDEV}" ]; then
-			local fsuuid="$($DUMPE2FS_PROG -h "${SCRATCH_DEV}" 2>/dev/null | \
-					grep 'Journal UUID:' | \
-					sed -e 's/Journal UUID:[[:space:]]*//g')"
-			$MKFS_EXT4_PROG -O journal_dev "${SCRATCH_LOGDEV}" \
-					-F -U "${fsuuid}"
-		fi
-		return 0
+		_ext4_mdrestore "${metadump}" "${SCRATCH_DEV}" "${logdev}"
+		return $?
 		;;
 	esac
 	return 1