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https://github.com/xen-project/xen.git
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George Dunlap
529c9e9c06
The blocktap library isn't really necessary; all the necessary functionality is available via the tap-ctl binary. To use: script=block-tap,vdev=[whatever],target=vhd:/path/to/file.vhd script=block-tap,vdev=[whatever],target=aio:/path/to/file.raw Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>
124 lines
2.6 KiB
Bash
Executable File
124 lines
2.6 KiB
Bash
Executable File
#!/bin/bash -e
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#
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# tapdisk Xen block device hotplug script
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#
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# Author George Dunlap <george.dunlap@eu.citrix.com>
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#
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# Based on block-iscsi by Roger Pau Monné <roger.pau@citrix.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation; version 2.1 only. with the special
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# exception on linking described in file LICENSE.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# Usage:
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#
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# Target should be specified using the following syntax:
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#
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# script=block-tap,vdev=xvda,target=<type>:<file>
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#
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# Type is either "aio" (for raw files), or "vhd"
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dir=$(dirname "$0")
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. "$dir/block-common.sh"
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remove_label()
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{
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echo $1 | sed "s/^\("$2"\)//"
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}
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check_tools()
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{
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if ! command -v tap-ctl > /dev/null 2>&1; then
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fatal "Unable to find tap-ctl tool"
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fi
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modprobe blktap
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if ! tap-ctl check >& /dev/null ; then
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fatal "Blocktap kernel module not available"
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fi
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}
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# Sets the following global variables based on the params field passed in as
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# a parameter: type file
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parse_target()
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{
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params=($(echo "$1" | tr ":" "\n"))
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type=${params[0]}
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file=${params[1]}
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if [ -z "$type" ] || [ -z "$file" ]; then
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fatal "Cannot parse required parameters"
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fi
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}
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# Sets $pid and $minor to point to the device associated with the target
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find_device()
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{
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local info
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local param
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if [ -z "$type" ] || [ -z "$file" ]; then
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fatal "required parameters not set"
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fi
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info=$(tap-ctl list -t $type -f $file)
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for param in $(echo "$info" | tr "," "\n")
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do
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case $param in
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pid=*)
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pid=$(remove_label $param "pid=")
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;;
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minor=*)
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minor=$(remove_label $param "minor=")
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;;
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esac
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done
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if [ -z "$pid" ] || [ -z "$minor" ]; then
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fatal "cannot find required parameters"
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fi
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}
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# Attaches the device and writes xenstore backend entries to connect
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# the device
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add()
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{
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dev=$(tap-ctl create -a $target)
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write_dev $dev
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}
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# Disconnects the device
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remove()
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{
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find_device
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do_or_die tap-ctl destroy -p ${pid} -m ${minor} > /dev/null
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}
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command=$1
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target=$(xenstore-read $XENBUS_PATH/params || true)
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if [ -z "$target" ]; then
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fatal "No information about the target"
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fi
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parse_target "$target"
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check_tools || exit 1
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case $command in
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add)
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add
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;;
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remove)
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remove
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;;
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*)
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exit 1
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;;
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esac
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