[PATCH 02/10] common/xfs: simplify maximum metadump format detection

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

xfs_metadump (aka the wrapper around xfs_db -c metadump) advertises the
-v switch to turn on v2 format in its help screen.  There's no need to
fire up xfs_db on the scratch device which will load the AGs and take
much longer.

While we're at it, reduce the amount of boilerplate in the test files by
changing the function to emit the max version supported.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Zorro Lang <zlang@kernel.org>
---
 common/xfs    |   10 +++++++---
 tests/xfs/129 |    3 +--
 tests/xfs/234 |    3 +--
 tests/xfs/253 |    3 +--
 tests/xfs/291 |    3 +--
 tests/xfs/432 |    3 +--
 tests/xfs/503 |    3 +--
 tests/xfs/605 |    3 +--
 8 files changed, 14 insertions(+), 17 deletions(-)


diff --git a/common/xfs b/common/xfs
index 11cfd79562..248ccefda3 100644
--- a/common/xfs
+++ b/common/xfs
@@ -713,10 +713,14 @@ _xfs_mdrestore() {
 	$XFS_MDRESTORE_PROG $options "${metadump}" "${device}"
 }
 
-_scratch_metadump_v2_supported()
+# What is the maximum metadump file format supported by xfs_metadump?
+_xfs_metadump_max_version()
 {
-	$XFS_DB_PROG -c "help metadump" $SCRATCH_DEV | \
-		grep -q "Metadump version to be used"
+	if $XFS_METADUMP_PROG --help 2>&1 | grep -q -- '-v version'; then
+		echo 2
+	else
+		echo 1
+	fi
 }
 
 # Snapshot the metadata on the scratch device
diff --git a/tests/xfs/129 b/tests/xfs/129
index 8a817b416c..cdac2349df 100755
--- a/tests/xfs/129
+++ b/tests/xfs/129
@@ -106,8 +106,7 @@ verify_metadump_v2()
 
 _scratch_mkfs >/dev/null 2>&1
 
-max_md_version=1
-_scratch_metadump_v2_supported && max_md_version=2
+max_md_version=$(_xfs_metadump_max_version)
 
 _scratch_mount
 
diff --git a/tests/xfs/234 b/tests/xfs/234
index c9bdb674ab..f4f8af6d3a 100755
--- a/tests/xfs/234
+++ b/tests/xfs/234
@@ -106,8 +106,7 @@ verify_metadump_v2()
 
 _scratch_mkfs >/dev/null 2>&1
 
-max_md_version=1
-_scratch_metadump_v2_supported && max_md_version=2
+max_md_version=$(_xfs_metadump_max_version)
 
 _scratch_mount
 
diff --git a/tests/xfs/253 b/tests/xfs/253
index 8e18ddb83a..3b567999d8 100755
--- a/tests/xfs/253
+++ b/tests/xfs/253
@@ -233,8 +233,7 @@ cd $here
 
 _scratch_unmount
 
-max_md_version=1
-_scratch_metadump_v2_supported && max_md_version=2
+max_md_version=$(_xfs_metadump_max_version)
 
 verify_metadump_v1 $max_md_version
 
diff --git a/tests/xfs/291 b/tests/xfs/291
index 33193eb78e..1433140821 100755
--- a/tests/xfs/291
+++ b/tests/xfs/291
@@ -92,8 +92,7 @@ _scratch_xfs_check >> $seqres.full 2>&1 || _fail "xfs_check failed"
 
 # Yes they can!  Now...
 # Can xfs_metadump cope with this monster?
-max_md_version=1
-_scratch_metadump_v2_supported && max_md_version=2
+max_md_version=$(_xfs_metadump_max_version)
 
 for md_version in $(seq 1 $max_md_version); do
 	version=""
diff --git a/tests/xfs/432 b/tests/xfs/432
index a215d3ce2e..7e402aa88f 100755
--- a/tests/xfs/432
+++ b/tests/xfs/432
@@ -87,8 +87,7 @@ echo "qualifying extent: $extlen blocks" >> $seqres.full
 test -n "$extlen" || _notrun "could not create dir extent > 1000 blocks"
 
 echo "Try to metadump, restore and check restored metadump image"
-max_md_version=1
-_scratch_metadump_v2_supported && max_md_version=2
+max_md_version=$(_xfs_metadump_max_version)
 
 for md_version in $(seq 1 $max_md_version); do
 	version=""
diff --git a/tests/xfs/503 b/tests/xfs/503
index a1479eb613..8643c3d483 100755
--- a/tests/xfs/503
+++ b/tests/xfs/503
@@ -54,8 +54,7 @@ check_restored_metadump_image()
 	_destroy_loop_device $loop_dev
 }
 
-max_md_version=1
-_scratch_metadump_v2_supported && max_md_version=2
+max_md_version=$(_xfs_metadump_max_version)
 
 echo "metadump and mdrestore"
 for md_version in $(seq 1 $max_md_version); do
diff --git a/tests/xfs/605 b/tests/xfs/605
index 5cbf5d2550..f2cd7aba98 100755
--- a/tests/xfs/605
+++ b/tests/xfs/605
@@ -44,8 +44,7 @@ testfile=${SCRATCH_MNT}/testfile
 echo "Format filesystem on scratch device"
 _scratch_mkfs >> $seqres.full 2>&1
 
-max_md_version=1
-_scratch_metadump_v2_supported && max_md_version=2
+max_md_version=$(_xfs_metadump_max_version)
 
 external_log=0
 if [[ $USE_EXTERNAL = yes && -n "$SCRATCH_LOGDEV" ]]; then