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##/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat, Inc. All Rights Reserved.
#
# common functions for setting up and tearing down a dmdelay device
DELAY_NONE=0
DELAY_READ=1
_init_delay()
{
local BLK_DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`
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 $SCRATCH_DEV 0 0"
_dmsetup_create delay-test --table "$DELAY_TABLE" || \
_fatal "failed to create delay device"
}
_mount_delay()
{
_scratch_options mount
$MOUNT_PROG -t $FSTYP `_common_dev_mount_options` $SCRATCH_OPTIONS \
$DELAY_DEV $SCRATCH_MNT
}
_unmount_delay()
{
$UMOUNT_PROG $SCRATCH_MNT
}
_cleanup_delay()
{
# If dmsetup load fails then we need to make sure to do resume here
# otherwise the umount will hang
$DMSETUP_PROG resume delay-test > /dev/null 2>&1
$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
_dmsetup_remove delay-test
}
# _load_delay_table <table> [lockfs]
#
# This defaults to --nolockfs, which doesn't freeze_fs() before loading the new
# table
_load_delay_table()
{
table="$DELAY_TABLE"
[ $1 -eq $DELAY_READ ] && table="$DELAY_TABLE_RDELAY"
suspend_opt="--nolockfs"
[ $# -gt 1 ] && [ $2 -eq 1 ] && suspend_opt=""
# run a suspend/resume cycle to avoid excessive resume delays once a
# delay is introduced below
$DMSETUP_PROG suspend $suspend_opt delay-test
$DMSETUP_PROG resume $suspend_opt delay-test
$DMSETUP_PROG suspend $suspend_opt delay-test
[ $? -ne 0 ] && _fatal "failed to suspend delay-test"
$DMSETUP_PROG load delay-test --table "$table"
[ $? -ne 0 ] && _fatal "failed to load table into delay-test"
$DMSETUP_PROG resume delay-test
[ $? -ne 0 ] && _fatal "failed to resume delay-test"
}
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