common/dmdelay

   1 ##/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Copyright (c) 2016 Red Hat, Inc.  All Rights Reserved.
   4 #
   5 # common functions for setting up and tearing down a dmdelay device
   6
   7 DELAY_NONE=0
   8 DELAY_READ=1
   9
  10 echo $MOUNT_OPTIONS | grep -q dax
  11 if [ $? -eq 0 ]; then
  12         _notrun "Cannot run tests with DAX on dmdelay devices"
  13 fi
  14
  15 _init_delay()
  16 {
  17         local BLK_DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`
  18         DELAY_DEV=/dev/mapper/delay-test
  19         DELAY_TABLE="0 $BLK_DEV_SIZE delay $SCRATCH_DEV 0 0"
  20         DELAY_TABLE_RDELAY="0 $BLK_DEV_SIZE delay $SCRATCH_DEV 0 10000 $SCRATCH_DEV 0 0"
  21         _dmsetup_create delay-test --table "$DELAY_TABLE" || \
  22                 _fatal "failed to create delay device"
  23 }
  24
  25 _mount_delay()
  26 {
  27         _scratch_options mount
  28         $MOUNT_PROG -t $FSTYP `_common_dev_mount_options` $SCRATCH_OPTIONS \
  29                 $DELAY_DEV $SCRATCH_MNT
  30 }
  31
  32 _unmount_delay()
  33 {
  34         $UMOUNT_PROG $SCRATCH_MNT
  35 }
  36
  37 _cleanup_delay()
  38 {
  39         # If dmsetup load fails then we need to make sure to do resume here
  40         # otherwise the umount will hang
  41         $DMSETUP_PROG resume delay-test > /dev/null 2>&1
  42         $UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
  43         _dmsetup_remove delay-test
  44 }
  45
  46 # _load_delay_table <table> [lockfs]
  47 #
  48 # This defaults to --nolockfs, which doesn't freeze_fs() before loading the new
  49 # table
  50 _load_delay_table()
  51 {
  52         table="$DELAY_TABLE"
  53         [ $1 -eq $DELAY_READ ] && table="$DELAY_TABLE_RDELAY"
  54
  55         suspend_opt="--nolockfs"
  56         [ $# -gt 1 ] && [ $2 -eq 1 ] && suspend_opt=""
  57
  58         # run a suspend/resume cycle to avoid excessive resume delays once a
  59         # delay is introduced below
  60         $DMSETUP_PROG suspend $suspend_opt delay-test
  61         $DMSETUP_PROG resume $suspend_opt delay-test
  62
  63         $DMSETUP_PROG suspend $suspend_opt delay-test
  64         [ $? -ne 0 ] && _fatal "failed to suspend delay-test"
  65
  66         $DMSETUP_PROG load delay-test --table "$table"
  67         [ $? -ne 0 ] && _fatal "failed to load table into delay-test"
  68
  69         $DMSETUP_PROG resume delay-test
  70         [ $? -ne 0 ] && _fatal  "failed to resume delay-test"
  71 }