| ##/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" |
| } |