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Keir Fraser
286423408d
blktap2 devices must be handled differently than blktap2
devices. blktap2 devices require a sysfs write to close the underlying
device, as well as extra sysfs writes when the domU is
paused/unpaused. The differences between blktap1 and blktap2 are great
enough to warrant the creation of a new device class, 'tap2', and
device controller for blktap2 devices.
* add a new device controller (Blktap2Controller) and device class
(tap2) for blktap2 devices
* move blktap2 specific code from DevController to Blktap2Controller
* if possible, check xenstore to determine block device class
* use vmpath (/vm/<uuid>/) when releasing devices
* modify linux hotplug cleanup script to handle blktap2 device
removal
Signed-off-by: Ryan O'Connor <rjo@cs.ubc.ca>
44 lines
1.4 KiB
Bash
44 lines
1.4 KiB
Bash
#! /bin/bash
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dir=$(dirname "$0")
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. "$dir/xen-hotplug-common.sh"
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# Claim the lock protecting ${XEN_SCRIPT_DIR}/block. This stops a race whereby
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# paths in the store would disappear underneath that script as it attempted to
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# read from the store checking for device sharing.
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# Any other scripts that do similar things will have to have their lock
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# claimed too.
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# This is pretty horrible, but there's not really a nicer way of solving this.
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claim_lock "block"
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# split backend/DEVCLASS/VMID/DEVID on slashes
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path_array=( ${XENBUS_PATH//\// } )
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# get /vm/UUID path
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vm=$(xenstore_read_default "/local/domain/${path_array[2]}/vm" "")
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# construct /vm/UUID/device/DEVCLASS/DEVID
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if [ "$vm" != "" ]; then
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vm_dev="$vm/device/${path_array[1]}/${path_array[3]}"
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# if the vm path does not exist and the device class is 'vbd' then we may have
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# a tap2 device
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if [ ! $(xenstore-read "vm_dev" 2>/dev/null) ] \
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&& [ "${path_array[1]}" = "vbd" ]; then
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vm_dev="$vm/device/tap2/${path_array[3]}"
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fi
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else
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vm_dev=
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fi
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# remove device frontend store entries
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xenstore-rm -t \
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$(xenstore-read "$XENBUS_PATH/frontend" 2>/dev/null) 2>/dev/null || true
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# remove device backend store entries
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xenstore-rm -t "$XENBUS_PATH" 2>/dev/null || true
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xenstore-rm -t "error/$XENBUS_PATH" 2>/dev/null || true
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# remove device path from /vm/UUID
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[ "$vm_dev" != "" ] && xenstore-rm -t "$vm_dev" 2>/dev/null || true
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release_lock "block"
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