Hello,
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
issues?
Sincerely
Philipp
--
Philipp Hahn Open Source Software Engineer h...@univention.de
Univention GmbH be open. fon: +49 421 22 232- 0
Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99
http://www.univention.de/
