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103 lines
3.1 KiB
Bash
103 lines
3.1 KiB
Bash
# vim: filetype=sh
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#
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# Copyright (c) 2017 Spectra Logic Corporation
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions, and the following disclaimer,
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# without modification.
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# 2. Redistributions in binary form must reproduce at minimum a disclaimer
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# substantially similar to the "NO WARRANTY" disclaimer below
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# ("Disclaimer") and any redistribution must be conditioned upon
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# including a substantially similar Disclaimer requirement for further
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# binary redistribution.
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#
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# NO WARRANTY
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGES.
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#
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#
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#
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# Routines that use gnop(8) to simulate devices that can disappear at any time
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#
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# Create a gnop device on top of a real device. Don't use the full extent; use
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# a portion in the middle so that any ZFS label present on the real device
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# won't be present on the gnop device and vice versa.
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function create_gnop
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{
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# Name of disk to use, with or without /dev/
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typeset disk=$1
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# Optional physical path to use
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typeset physpath=$2
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# size of disk in bytes
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typeset -li disk_size
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# disk size, rounded down to multiple of 16384
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typeset -li disk_size_rounded
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# size of the nop device in bytes
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typeset -li nop_size
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# offset of the beginning of the nop device in bytes
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typeset -li nop_offset
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typeset args
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disk_size=`diskinfo $disk | cut -f 3`
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# Round it down so the nop device will be 4k-aligned
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disk_size_rounded=$(( ${disk_size} / 16384 * 16384 ))
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nop_size=$(( ${disk_size_rounded} / 4 ))
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nop_offset=${nop_size}
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args="-s ${nop_size} -o ${nop_offset}"
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if [ -n "$physpath" ]; then
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args="$args -z $physpath"
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fi
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gnop create ${args} ${disk}
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}
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# Create multiple gnop devices
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function create_gnops
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{
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typeset disk
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for disk in $@; do
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create_gnop "$disk" || return 1
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done
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return 0
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}
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# Destroy a gnop device.
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function destroy_gnop
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{
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# Name of the underlying (non-gnop) device
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typeset disk=$1
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# Use "-f" so we can destroy a gnop with a consumer (like ZFS)
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gnop destroy -f ${disk}.nop
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# Wait for it to disappear
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for i in `seq 5`; do
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gnop status ${disk}.nop >/dev/null 2>/dev/null || break
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sleep $i
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done
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}
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# Destroy multiple gnop devices. Attempt to destroy them all, ignoring errors
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function destroy_gnops
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{
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typeset disk
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for disk in $@; do
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destroy_gnop "$disk"
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done
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return 0
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}
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