common/dmhugedisk

   1 ##/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0+
   3 # Copyright (c) 2016 Oracle.  All Rights Reserved.
   4 #
   5 # Routines for creating huge (fake) disks
   6
   7 _require_dmhugedisk()
   8 {
   9         _require_dm_target zero
  10         _require_dm_target snapshot
  11 }
  12
  13 _dmhugedisk_init()
  14 {
  15         test -z "$1" && _fatal "must specify sector count to _dmhugedisk_init"
  16         local dm_backing_dev=$SCRATCH_DEV
  17         local chunk_size="$2"
  18
  19         if [ -z "$chunk_size" ]; then
  20                 chunk_size=512
  21         fi
  22
  23         $DMSETUP_PROG remove huge-test > /dev/null 2>&1
  24         $DMSETUP_PROG remove huge-test-zero > /dev/null 2>&1
  25
  26         local blk_dev_size=$1
  27
  28         DMHUGEDISK_ZERO='/dev/mapper/huge-test-zero'
  29         DMHUGEDISK_DEV='/dev/mapper/huge-test'
  30
  31         DMHUGEDISK_ZERO_TABLE="0 $blk_dev_size zero"
  32         DMHUGEDISK_DEV_TABLE="0 $blk_dev_size snapshot $DMHUGEDISK_ZERO $SCRATCH_DEV N $chunk_size"
  33
  34         $DMSETUP_PROG create huge-test-zero --table "$DMHUGEDISK_ZERO_TABLE" || \
  35                 _fatal "failed to create dm huge zero device"
  36         $DMSETUP_PROG create huge-test --table "$DMHUGEDISK_DEV_TABLE" || \
  37                 _fatal "failed to create dm huge device"
  38 }
  39
  40 _dmhugedisk_cleanup()
  41 {
  42         $UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
  43         # wait for device to be fully settled so that 'dmsetup remove' doesn't
  44         # fail due to EBUSY
  45         $UDEV_SETTLE_PROG >/dev/null 2>&1
  46         $DMSETUP_PROG remove huge-test > /dev/null 2>&1
  47         $DMSETUP_PROG remove huge-test-zero > /dev/null 2>&1
  48 }