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Ran 09 Apr 2015 04:18PM UTC

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Committed 09 Apr 2015 04:11PM UTC coverage: 31.655% (-0.006%) from 31.661%

Job # 101.1

Build Type

Pull #251

travis-ci

Committed by

franciozzy

Commit Message

CP-11936: Automatically plug block-based RAW VDIs via blkback

This patch causes block-based (LV) RAW VDIs to be automatically plugged by
blkback. This is achieved as follows:

During VDI.attach, we detect that the SR handles LVM and that the VDI driver
is 'aio'. In that case, we write 'backend-kind: vbd' to xenstore_data, which
causes the toolstack to use the /local/domain/0/backend/vbd/ path instead of
.../vbd3/. This is the preferred method following CP-11511. By writing to
.../vbd/, blkback wakes up instead of tapback.

During VDI.activate, we create the /dev/sm/backend/ node using the maj/min
numbers of the actual VDI (LV) instead of those of the blktap2 device. This
causes the udev hotplug scripts to write the /physical-device/ entry with
information of the LV, creating the blkfront-blkback-vdi datapath without
blktap2 or tapdisk3 in the middle.

Note that a tapdisk3 and a blktap2 will still exist in dom0, providing all
necessary backend infrastructure resources for other operations.

Signed-off-by: Felipe Franciosi <felipe@paradoxo.org>

Pull Request Pull Request #251: CP-11936: Automatically plug block-based RAW VDIs via blkback

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