[PATCH v3] common: Add _dmsetup_create and _dmsetup_remove helpers

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Make sure both "$UDEV_SETTLE_PROG" and "mknodes" can always
be run after a dm create or remove operation.

Suggested-by: Dave Chinner <david@xxxxxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Xiao Yang <yangx.jy@xxxxxxxxxxxxxx>
---
 common/dmdelay     |  9 ++-------
 common/dmerror     |  9 +++------
 common/dmflakey    | 14 +++-----------
 common/dmhugedisk  | 15 ++++++---------
 common/dmlogwrites |  9 ++-------
 common/dmthin      | 19 ++++++++-----------
 common/rc          | 14 ++++++++++++++
 tests/generic/085  | 11 ++++-------
 8 files changed, 42 insertions(+), 58 deletions(-)

diff --git a/common/dmdelay b/common/dmdelay
index b9e4b9b..f1e725b 100644
--- a/common/dmdelay
+++ b/common/dmdelay
@@ -18,9 +18,8 @@ _init_delay()
 	DELAY_DEV=/dev/mapper/delay-test
 	DELAY_TABLE="0 $BLK_DEV_SIZE delay $SCRATCH_DEV 0 0"
 	DELAY_TABLE_RDELAY="0 $BLK_DEV_SIZE delay $SCRATCH_DEV 0 10000 $SCRATCH_DEV 0 0"
-	$DMSETUP_PROG create delay-test --table "$DELAY_TABLE" || \
+	_dmsetup_create delay-test --table "$DELAY_TABLE" || \
 		_fatal "failed to create delay device"
-	$DMSETUP_PROG mknodes > /dev/null 2>&1
 }
 
 _mount_delay()
@@ -41,11 +40,7 @@ _cleanup_delay()
 	# otherwise the umount will hang
 	$DMSETUP_PROG resume delay-test > /dev/null 2>&1
 	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
-	# wait for device to be fully settled so that 'dmsetup remove' doesn't
-	# fail due to EBUSY
-	$UDEV_SETTLE_PROG >/dev/null 2>&1
-	$DMSETUP_PROG remove delay-test > /dev/null 2>&1
-	$DMSETUP_PROG mknodes > /dev/null 2>&1
+	_dmsetup_remove delay-test
 }
 
 # _load_delay_table <table> [lockfs]
diff --git a/common/dmerror b/common/dmerror
index 4d6b885..8c52e12 100644
--- a/common/dmerror
+++ b/common/dmerror
@@ -25,8 +25,8 @@ _dmerror_setup()
 _dmerror_init()
 {
 	_dmerror_setup
-	$DMSETUP_PROG remove error-test > /dev/null 2>&1
-	$DMSETUP_PROG create error-test --table "$DMLINEAR_TABLE" || \
+	_dmsetup_remove error-test
+	_dmsetup_create error-test --table "$DMLINEAR_TABLE" || \
 		_fatal "failed to create dm linear device"
 }
 
@@ -45,10 +45,7 @@ _dmerror_unmount()
 _dmerror_cleanup()
 {
 	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
-	# wait for device to be fully settled so that 'dmsetup remove' doesn't
-	# fail due to EBUSY
-	$UDEV_SETTLE_PROG >/dev/null 2>&1
-	$DMSETUP_PROG remove error-test > /dev/null 2>&1
+	_dmsetup_remove error-test
 }
 
 _dmerror_load_error_table()
diff --git a/common/dmflakey b/common/dmflakey
index 51eab16..2af3924 100644
--- a/common/dmflakey
+++ b/common/dmflakey
@@ -20,9 +20,8 @@ _init_flakey()
 	FLAKEY_TABLE="0 $BLK_DEV_SIZE flakey $SCRATCH_DEV 0 180 0"
 	FLAKEY_TABLE_DROP="0 $BLK_DEV_SIZE flakey $SCRATCH_DEV 0 0 180 1 drop_writes"
 	FLAKEY_TABLE_ERROR="0 $BLK_DEV_SIZE flakey $SCRATCH_DEV 0 0 180 1 error_writes"
-	$DMSETUP_PROG create flakey-test --table "$FLAKEY_TABLE" || \
+	_dmsetup_create flakey-test --table "$FLAKEY_TABLE" || \
 		_fatal "failed to create flakey device"
-	$DMSETUP_PROG mknodes > /dev/null 2>&1
 }
 
 _mount_flakey()
@@ -42,11 +41,7 @@ _cleanup_flakey()
 	# otherwise the umount will hang
 	$DMSETUP_PROG resume flakey-test > /dev/null 2>&1
 	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
-	# wait for device to be fully settled so that 'dmsetup remove' doesn't
-	# fail due to EBUSY
-	$UDEV_SETTLE_PROG >/dev/null 2>&1
-	$DMSETUP_PROG remove flakey-test > /dev/null 2>&1
-	$DMSETUP_PROG mknodes > /dev/null 2>&1
+	_dmsetup_remove flakey-test
 }
 
 # _load_flakey_table <table> [lockfs]
@@ -101,11 +96,8 @@ _require_flakey_with_error_writes()
 	SIZE=`blockdev --getsz $SCRATCH_DEV`
 	TABLE="0 $SIZE flakey $SCRATCH_DEV 0 0 180 1 error_writes"
 
-	$DMSETUP_PROG create $NAME --table "$TABLE" >/dev/null 2>&1
-	if [ $? -ne 0 ]; then
+	_dmsetup_create $NAME --table "$TABLE" || \
 		_notrun "This test requires error_writes feature in dm-flakey"
-	fi
-	$DMSETUP_PROG mknodes >/dev/null 2>&1
 
 	_cleanup_flakey
 }
diff --git a/common/dmhugedisk b/common/dmhugedisk
index 4d0406d..502f024 100644
--- a/common/dmhugedisk
+++ b/common/dmhugedisk
@@ -20,8 +20,8 @@ _dmhugedisk_init()
 		chunk_size=512
 	fi
 
-	$DMSETUP_PROG remove huge-test > /dev/null 2>&1
-	$DMSETUP_PROG remove huge-test-zero > /dev/null 2>&1
+	_dmsetup_remove huge-test
+	_dmsetup_remove huge-test-zero
 
 	local blk_dev_size=$1
 
@@ -31,18 +31,15 @@ _dmhugedisk_init()
 	DMHUGEDISK_ZERO_TABLE="0 $blk_dev_size zero"
 	DMHUGEDISK_DEV_TABLE="0 $blk_dev_size snapshot $DMHUGEDISK_ZERO $SCRATCH_DEV N $chunk_size"
 
-	$DMSETUP_PROG create huge-test-zero --table "$DMHUGEDISK_ZERO_TABLE" || \
+	_dmsetup_create huge-test-zero --table "$DMHUGEDISK_ZERO_TABLE" || \
 		_fatal "failed to create dm huge zero device"
-	$DMSETUP_PROG create huge-test --table "$DMHUGEDISK_DEV_TABLE" || \
+	_dmsetup_create huge-test --table "$DMHUGEDISK_DEV_TABLE" || \
 		_fatal "failed to create dm huge device"
 }
 
 _dmhugedisk_cleanup()
 {
 	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
-	# wait for device to be fully settled so that 'dmsetup remove' doesn't
-	# fail due to EBUSY
-	$UDEV_SETTLE_PROG >/dev/null 2>&1
-	$DMSETUP_PROG remove huge-test > /dev/null 2>&1
-	$DMSETUP_PROG remove huge-test-zero > /dev/null 2>&1
+	_dmsetup_remove huge-test
+	_dmsetup_remove huge-test-zero
 }
diff --git a/common/dmlogwrites b/common/dmlogwrites
index 9963bd9..b9cbae7 100644
--- a/common/dmlogwrites
+++ b/common/dmlogwrites
@@ -51,9 +51,8 @@ _log_writes_init()
 	LOGWRITES_NAME=logwrites-test
 	LOGWRITES_DMDEV=/dev/mapper/$LOGWRITES_NAME
 	LOGWRITES_TABLE="0 $BLK_DEV_SIZE log-writes $SCRATCH_DEV $LOGWRITES_DEV"
-	$DMSETUP_PROG create $LOGWRITES_NAME --table "$LOGWRITES_TABLE" || \
+	_dmsetup_create $LOGWRITES_NAME --table "$LOGWRITES_TABLE" || \
 		_fail "failed to create log-writes device"
-	$DMSETUP_PROG mknodes > /dev/null 2>&1
 }
 
 _log_writes_mark()
@@ -100,16 +99,12 @@ _log_writes_replay_log()
 
 _log_writes_remove()
 {
-	$DMSETUP_PROG remove $LOGWRITES_NAME > /dev/null 2>&1
-	$DMSETUP_PROG mknodes > /dev/null 2>&1
+	_dmsetup_remove $LOGWRITES_NAME
 }
 
 _log_writes_cleanup()
 {
 	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
-	# wait for device to be fully settled so that 'dmsetup remove' doesn't
-	# fail due to EBUSY
-	$UDEV_SETTLE_PROG >/dev/null 2>&1
 	_log_writes_remove
 }
 
diff --git a/common/dmthin b/common/dmthin
index 039d63e..7946e9a 100644
--- a/common/dmthin
+++ b/common/dmthin
@@ -29,13 +29,10 @@ fi
 _dmthin_cleanup()
 {
 	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
-	# wait for device to be fully settled so that 'dmsetup remove' doesn't
-	# fail due to EBUSY
-	$UDEV_SETTLE_PROG >/dev/null 2>&1
-	$DMSETUP_PROG remove $DMTHIN_VOL_NAME> /dev/null 2>&1
-	$DMSETUP_PROG remove $DMTHIN_POOL_NAME> /dev/null 2>&1
-	$DMSETUP_PROG remove $DMTHIN_META_NAME> /dev/null 2>&1
-	$DMSETUP_PROG remove $DMTHIN_DATA_NAME> /dev/null 2>&1
+	_dmsetup_remove $DMTHIN_VOL_NAME
+	_dmsetup_remove $DMTHIN_POOL_NAME
+	_dmsetup_remove $DMTHIN_META_NAME
+	_dmsetup_remove $DMTHIN_DATA_NAME
 }
 
 _dmthin_check_fs()
@@ -112,13 +109,13 @@ _dmthin_init()
 
 	# Metadata device
 	DMTHIN_META_TABLE="0 $meta_dev_size linear $dm_backing_dev $meta_dev_offset"
-	$DMSETUP_PROG create $DMTHIN_META_NAME --table "$DMTHIN_META_TABLE" || \
+	_dmsetup_create $DMTHIN_META_NAME --table "$DMTHIN_META_TABLE" || \
 		_fatal "failed to create dm thin meta device"
 
 	# Data device
 	local data_dev_offset=$((meta_dev_offset + $meta_dev_size))
 	DMTHIN_DATA_TABLE="0 $data_dev_size linear $dm_backing_dev $data_dev_offset"
-	$DMSETUP_PROG create $DMTHIN_DATA_NAME --table "$DMTHIN_DATA_TABLE" || \
+	_dmsetup_create $DMTHIN_DATA_NAME --table "$DMTHIN_DATA_TABLE" || \
 		_fatal "failed to create dm thin data device"
 
 	# Zap the pool metadata dev
@@ -127,7 +124,7 @@ _dmthin_init()
 	# Thin pool
 	# "start length thin-pool metadata_dev data_dev data_block_size low_water_mark"
 	DMTHIN_POOL_TABLE="0 $data_dev_size thin-pool $DMTHIN_META_DEV $DMTHIN_DATA_DEV $cluster_size $low_water"
-	$DMSETUP_PROG create $DMTHIN_POOL_NAME --table "$DMTHIN_POOL_TABLE" || \
+	_dmsetup_create $DMTHIN_POOL_NAME --table "$DMTHIN_POOL_TABLE" || \
 		_fatal "failed to create dm thin pool device"
 
 	# Thin volume
@@ -136,7 +133,7 @@ _dmthin_init()
 
 	# start length thin pool_dev dev_id [external_origin_dev]
 	DMTHIN_VOL_TABLE="0 $virtual_size thin $DMTHIN_POOL_DEV $pool_id"
-	$DMSETUP_PROG create $DMTHIN_VOL_NAME --table "$DMTHIN_VOL_TABLE" || \
+	_dmsetup_create $DMTHIN_VOL_NAME --table "$DMTHIN_VOL_TABLE" || \
 		_fatal "failed to create dm thin volume device"
 
 }
diff --git a/common/rc b/common/rc
index 1945066..ec631ad 100644
--- a/common/rc
+++ b/common/rc
@@ -3794,6 +3794,20 @@ _require_label_get_max()
 	dummy=$(_label_get_max)
 }
 
+_dmsetup_remove()
+{
+	$UDEV_SETTLE_PROG >/dev/null 2>&1
+	$DMSETUP_PROG remove "$@" >>$seqres.full 2>&1
+	$DMSETUP_PROG mknodes >/dev/null 2>&1
+}
+
+_dmsetup_create()
+{
+	$DMSETUP_PROG create "$@" >>$seqres.full 2>&1 || return 1
+	$DMSETUP_PROG mknodes >/dev/null 2>&1
+	$UDEV_SETTLE_PROG >/dev/null 2>&1
+}
+
 init_rc
 
 ################################################################################
diff --git a/tests/generic/085 b/tests/generic/085
index bed1e0d..31226c8 100755
--- a/tests/generic/085
+++ b/tests/generic/085
@@ -31,9 +31,7 @@ cleanup_dmdev()
 	# in case it's still suspended and/or mounted
 	$DMSETUP_PROG resume $lvdev >/dev/null 2>&1
 	$UMOUNT_PROG $lvdev >/dev/null 2>&1
-
-	$DMSETUP_PROG remove $node >>$seqres.full 2>&1
-	$DMSETUP_PROG mknodes >/dev/null 2>&1
+	_dmsetup_remove $node
 }
 
 # get standard environment, filters and checks
@@ -51,9 +49,8 @@ _require_freeze
 setup_dmdev()
 {
 	table="0 $size_in_sector linear $SCRATCH_DEV 0"
-	$DMSETUP_PROG create $node --table "$table" >>$seqres.full 2>&1 && \
-	$DMSETUP_PROG mknodes >/dev/null 2>&1
-	return $?
+	_dmsetup_create $node --table "$table" || \
+		_fail "setup dm device failed"
 }
 
 rm -f $seqres.full
@@ -65,7 +62,7 @@ _scratch_mkfs_sized $size >>$seqres.full 2>&1
 
 node=$seq-test
 lvdev=/dev/mapper/$node
-setup_dmdev || _fail "setup dm device failed"
+setup_dmdev
 
 # take use of dmsetup suspend to freeze the fs.
 # xfs_freeze/fsfreeze cannot be used in this test, because it can possibly
-- 
1.8.3.1



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