udev/qvm-block: exclude devices used elsewhere
Exclude exclude device if mounted/part of other device, or any of its partition is used (same definition). Update this state whenever device or it's partition receives udev event. Fixes QubesOS/qubes-issues#1600
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@ -1,5 +1,7 @@
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#!/bin/bash
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shopt -s nullglob
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export LC_CTYPE=en_US.UTF-8
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NAME=${DEVNAME#/dev/}
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DESC="`echo "${ID_MODEL} (${ID_FS_LABEL})" | iconv -f utf8 -t ascii//TRANSLIT`"
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@ -15,26 +17,62 @@ xs_remove() {
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echo QUBES_EXPOSED=0
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}
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# Ignore mounted...
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if fgrep -q $DEVNAME /proc/mounts; then
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is_used() {
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local sys_devpath=$1
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# mounted
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if fgrep -q $(basename $sys_devpath) /proc/mounts; then
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return 0
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fi
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# part of other device-mapper
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if [ -n "`ls -A $sys_devpath/holders 2> /dev/null`" ]; then
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return 0
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fi
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# open device-mapper device
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if [ -f "$sys_devpath/dm/name" ] && \
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/sbin/dmsetup info "$(cat $sys_devpath/dm/name)" |\
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grep -q "^Open count:.*[1-9]"; then
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return 0
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fi
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return 1
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}
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# update info about parent devices, if any:
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if [ -f /sys$DEVPATH/partition ]; then
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parent=$(dirname $(readlink -f /sys$DEVPATH))
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udevadm trigger \
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--property-match=DEVPATH=/$(realpath --relative-to=/sys $parent)
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fi
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# and underlying devices of device-mapper (if any)
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for dev in /sys$DEVPATH/slaves/*; do
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udevadm trigger \
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--property-match=DEVPATH=/$(realpath --relative-to=/sys $dev)
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done
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# then take care of this device:
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# device itself is already used
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if is_used /sys$DEVPATH; then
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xs_remove
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exit 0
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fi
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# ... and used by device-mapper
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if [ -n "`ls -A /sys/$DEVPATH/holders 2> /dev/null`" ]; then
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xs_remove
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exit 0
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fi
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# ... and used device-mapper devices
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if [ -n "$DM_NAME" ] && /sbin/dmsetup info "$DM_NAME" | grep -q "^Open count:.*[1-9]"; then
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xs_remove
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exit 0
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fi
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# ... and "empty" loop devices
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# or one of its partitions is used
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for part in /sys$DEVPATH/$NAME*; do
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if [ -d $part ]; then
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if is_used $part; then
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xs_remove
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exit 0
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fi
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fi
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done
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# or "empty" loop device
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if [ "$MAJOR" -eq 7 -a ! -d /sys/$DEVPATH/loop ]; then
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xs_remove
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exit 0
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fi
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# ... and temporary devices used during VM startup
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if [[ "$NAME" = 'loop'* ]] && \
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[[ "`cat /sys/block/${NAME%p*}/loop/backing_file`" = \
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@ -26,6 +26,11 @@ device_detach() {
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xenstore-rm $xs_path
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}
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# update info about underlying devices of device-mapper (if any)
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# at this stage device-mapper is already removed, so can't check what devices
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# were used there
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udevadm trigger --subsystem-match=block
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for XS_DEV_PATH in `xenstore-ls -f backend/vbd | grep 'backend/vbd/[0-9]*/[0-9]* ' | cut -f 1 -d ' '`; do
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CUR_DEVICE=`xenstore-read "$XS_DEV_PATH/params"`
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if [ "$CUR_DEVICE" == "$DEVNAME" ]; then
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