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95 lines
2.2 KiB
95 lines
2.2 KiB
#!/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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p=${p#tapdisk:}
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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
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