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  • Committer: Bazaar Package Importer
  • Author(s): Bastian Blank
  • Date: 2010-05-06 15:47:38 UTC
  • mto: (1.3.1) (15.1.1 sid) (4.1.1 experimental)
  • mto: This revision was merged to the branch mainline in revision 3.
  • Revision ID: james.westby@ubuntu.com-20100506154738-agoz0rlafrh1fnq7
Tags: upstream-4.0.0
Import upstream version 4.0.0

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tools/hotplug/Linux/blktap
 
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#!/bin/bash
 
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# Copyright (c) 2005, XenSource Ltd.
 
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dir=$(dirname "$0")
 
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. "$dir/xen-hotplug-common.sh"
 
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. "$dir/block-common.sh"
 
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findCommand "$@"
 
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##
 
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# check_blktap_sharing file mode
 
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#
 
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# Perform the sharing check for the given blktap and mode.
 
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#
 
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check_blktap_sharing()
 
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{
 
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    local file="$1"
 
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    local mode="$2"
 
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    local base_path="$XENBUS_BASE_PATH/$XENBUS_TYPE"
 
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    for dom in $(xenstore-list "$base_path")
 
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    do
 
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        for dev in $(xenstore-list "$base_path/$dom")
 
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        do
 
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            params=$(xenstore_read_default "$base_path/$dom/$dev/params" "" | cut -d: -f2)
 
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            if [ "$file" = "$params" ]
 
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            then
 
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                if [ "$mode" = 'w' ]
 
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                then
 
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                    if ! same_vm "$dom" 
 
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                    then
 
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                        echo 'guest'
 
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                        return
 
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                    fi
 
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                else 
 
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                    local m=$(xenstore_read_default "$base_path/$dom/$dev/mode" "")
 
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                    m=$(canonicalise_mode "$m")
 
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                    if [ "$m" = 'w' ] 
 
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                    then
 
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                        if ! same_vm "$dom"
 
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                        then
 
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                            echo 'guest'
 
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                            return
 
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                        fi
 
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                    fi
 
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                fi
 
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            fi
 
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        done
 
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    done
 
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    echo 'ok'
 
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}
 
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t=$(xenstore_read_default "$XENBUS_PATH/type" 'MISSING')
 
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if [ -n "$t" ]
 
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then
 
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    p=$(xenstore_read "$XENBUS_PATH/params")
 
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    # if we have a ':', chew from head including :
 
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    if echo $p | grep -q \:
 
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    then
 
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        p=${p#*:}
 
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    fi
 
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fi
 
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# some versions of readlink cannot be passed a regular file
 
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if [ -L "$p" ]; then
 
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    file=$(readlink -f "$p") || fatal "$p link does not exist."
 
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else
 
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    file="$p"
 
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fi
 
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if [ "$command" = 'add' ]
 
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then
 
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    [ -e "$file" ] || { fatal $file does not exist; }
 
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    FRONTEND_ID=$(xenstore_read "$XENBUS_PATH/frontend-id")
 
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    FRONTEND_UUID=$(xenstore_read "/local/domain/$FRONTEND_ID/vm")
 
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    mode=$(xenstore_read "$XENBUS_PATH/mode")
 
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    mode=$(canonicalise_mode "$mode")
 
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    if [ "$mode" != '!' ] 
 
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    then
 
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        result=$(check_blktap_sharing "$file" "$mode")
 
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        [ "$result" = 'ok' ] || ebusy "$file already in use by other domain"
 
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    fi
 
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    success
 
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fi
 
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exit 0