[PATCH] common/rc: update _require_dm_target() helper

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1) generic/459 should be skipped when dm_snapshot is not supported.
2) update _require_dm_target() to handle multiple dm targets

Signed-off-by: Xiao Yang <yangx.jy@xxxxxxxxxxxxxx>
---
 common/dmhugedisk            |  3 +--
 common/rc                    | 16 ++++++++--------
 doc/requirement-checking.txt |  6 +++---
 tests/generic/459            |  2 +-
 4 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/common/dmhugedisk b/common/dmhugedisk
index 4d3b63f..1c116c2 100644
--- a/common/dmhugedisk
+++ b/common/dmhugedisk
@@ -23,8 +23,7 @@
 
 _require_dmhugedisk()
 {
-	_require_dm_target zero
-	_require_dm_target snapshot
+	_require_dm_target zero snapshot
 }
 
 _dmhugedisk_init()
diff --git a/common/rc b/common/rc
index 4c053a5..6fe0ce9 100644
--- a/common/rc
+++ b/common/rc
@@ -1782,23 +1782,23 @@ _require_sane_bdev_flush()
 	fi
 }
 
-# this test requires a specific device mapper target
+# this test requires specific device mapper targets
 _require_dm_target()
 {
-	_target=$1
-
 	# require SCRATCH_DEV to be a valid block device with sane BLKFLSBUF
 	# behaviour
 	_require_block_device $SCRATCH_DEV
 	_require_sane_bdev_flush $SCRATCH_DEV
 	_require_command "$DMSETUP_PROG" dmsetup
 
-	modprobe dm-$_target >/dev/null 2>&1
+	for _target in "$@"; do
+		modprobe dm-$_target >/dev/null 2>&1
 
-	$DMSETUP_PROG targets 2>&1 | grep -q ^$_target
-	if [ $? -ne 0 ]; then
-		_notrun "This test requires dm $_target support"
-	fi
+		$DMSETUP_PROG targets 2>&1 | grep -q ^$_target
+		if [ $? -ne 0 ]; then
+			_notrun "This test requires dm $_target support"
+		fi
+	done
 }
 
 # this test requires the ext4 kernel support crc feature on scratch device
diff --git a/doc/requirement-checking.txt b/doc/requirement-checking.txt
index 4e01b1f..e27aacd 100644
--- a/doc/requirement-checking.txt
+++ b/doc/requirement-checking.txt
@@ -112,10 +112,10 @@ _require_statx
 DEVICE MAPPER REQUIREMENTS
 ==========================
 
-_require_dm_target <name>
+_require_dm_target <name1> <name2> ...
 
-     The test requires the use of the device mapper target and will be skipped
-     if it isn't available in the kernel.
+     The test requires the use of the device mapper targets and will be skipped
+     if any one isn't available in the kernel.
 
 _require_log_writes
 
diff --git a/tests/generic/459 b/tests/generic/459
index d1ad372..e3ac374 100755
--- a/tests/generic/459
+++ b/tests/generic/459
@@ -61,7 +61,7 @@ _cleanup()
 _supported_fs generic
 _supported_os Linux
 _require_scratch_nocheck
-_require_dm_target thin-pool
+_require_dm_target thin-pool snapshot
 _require_command $LVM_PROG lvm
 _require_command "$THIN_CHECK_PROG" thin_check
 _require_freeze
-- 
1.8.3.1



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