mirror of
https://github.com/xen-project/xen.git
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Wei Liu
f3a7ca0240
The original same_vm check has two bugs. When stubdom is in use because it relies on numeric domid to check if two domains are in fact the same one. Another one is that the check would fail when two stubdoms are checked against each other. The first bug is fixed by using uuid to identify a domain. The second bug is fixed by comparing the domains two stubdoms serve. Signed-off-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Release-acked-by: Wei Liu <wei.liu2@citrix.com>
129 lines
3.2 KiB
Bash
129 lines
3.2 KiB
Bash
#
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# Copyright (c) 2005 XenSource Ltd.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of version 2.1 of the GNU Lesser General Public
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# License as published by the Free Software Foundation.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; If not, see <http://www.gnu.org/licenses/>.
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#
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dir=$(dirname "$0")
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. "$dir/xen-hotplug-common.sh"
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findCommand "$@"
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if [ "$command" != "add" ] &&
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[ "$command" != "remove" ]
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then
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log err "Invalid command: $command"
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exit 1
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fi
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XENBUS_PATH="${XENBUS_PATH:?}"
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ebusy()
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{
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xenstore_write "$XENBUS_PATH/hotplug-error" "$*" \
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"$XENBUS_PATH/hotplug-status" busy
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log err "$@"
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exit 1
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}
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##
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# Print the given device's major and minor numbers, written in hex and
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# separated by a colon.
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device_major_minor()
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{
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stat -L -c %t:%T "$1"
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}
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##
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# Write physical-device = MM,mm to the store, where MM and mm are the major
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# and minor numbers of device respectively.
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#
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# @param device The device from which major and minor numbers are read, which
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# will be written into the store.
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#
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write_dev() {
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local mm
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mm=$(device_major_minor "$1")
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if [ -z $mm ]
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then
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fatal "Backend device does not exist"
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fi
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xenstore_write "$XENBUS_PATH/physical-device" "$mm"
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xenstore_write "$XENBUS_PATH/physical-device-path" "$1"
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success
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}
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##
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# canonicalise_mode mode
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#
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# Takes the given mode, which may be r, w, ro, rw, w!, or rw!, or variations
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# thereof, and canonicalises them to one of
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#
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# 'r': perform checks for a new read-only mount;
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# 'w': perform checks for a read-write mount; or
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# '!': perform no checks at all.
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#
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canonicalise_mode()
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{
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local mode="$1"
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if ! expr index "$mode" 'w' >/dev/null
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then
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echo 'r'
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elif ! expr index "$mode" '!' >/dev/null
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then
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echo 'w'
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else
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echo '!'
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fi
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}
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same_vm()
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{
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local otherdom="$1"
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# Note that othervm can be MISSING here, because Xend will be racing with
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# the hotplug scripts -- the entries in /local/domain can be removed by
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# Xend before the hotplug scripts have removed the entry in
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# /local/domain/0/backend/. In this case, we want to pretend that the
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# VM is the same as FRONTEND_UUID, because that way the 'sharing' will be
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# allowed.
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local othervm=$(xenstore_read_default "/local/domain/$otherdom/vm" \
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"$FRONTEND_UUID")
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local target=$(xenstore_read_default "/local/domain/$FRONTEND_ID/target" \
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"-1")
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local targetvm=$(xenstore_read_default "/local/domain/$target/vm" "-1")
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local otarget=$(xenstore_read_default "/local/domain/$otherdom/target" \
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"-1")
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local otvm=$(xenstore_read_default "/local/domain/$otarget/vm" \
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"-1")
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otvm=${otvm%-1}
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othervm=${othervm%-1}
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targetvm=${targetvm%-1}
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local frontend_uuid=${FRONTEND_UUID%-1}
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[ "$frontend_uuid" = "$othervm" -o "$targetvm" = "$othervm" -o \
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"$frontend_uuid" = "$otvm" -o "$targetvm" = "$otvm" ]
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}
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