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[Qemu-devel] backing file support for vpc/vhd ?

From: Philipp Hahn
Subject: [Qemu-devel] backing file support for vpc/vhd ?
Date: Wed, 19 Jun 2013 16:02:02 +0200
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while working on a Xen-VM I noticed that qemu-img does not support the backing 
file mechanism of vpc/vhd files, but Xens blktap2 does; it has a libvhd and 
some tools to create and modify vpc/vhd files:

tools/blktap2/vhd/lib/atomicio.c: BSD (2 clause)
tools/blktap2/vhd/lib/vhd-util-check.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-modify.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-uuid.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-scan.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-revert.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-snapshot.c: BSD (3 clause)
tools/blktap2/vhd/lib/libvhd.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-query.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-set-field.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-repair.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-fill.c: BSD (3 clause)
tools/blktap2/vhd/lib/libvhd-journal.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-read.c: BSD (3 clause)
tools/blktap2/vhd/lib/relative-path.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-coalesce.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-create.c: BSD (3 clause)
tools/blktap2/vhd/lib/vhd-util-resize.c: BSD (3 clause)
tools/blktap2/vhd/vhd-update.c: BSD (3 clause)
tools/blktap2/vhd/vhd-util.c: BSD (3 clause)

Is the lack of support for backing files in vpc/vjd in qemu just a question of 
time / interest, are there technical problems, or are there some political 

Philipp Hahn           Open Source Software Engineer      address@hidden
Univention GmbH        be open.                       fon: +49 421 22 232- 0
Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99

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