block: Allow references for backing files
commitd9b7b05703399fbc9b87553d7f164ffba1db4aa4
authorKevin Wolf <kwolf@redhat.com>
Fri, 16 Jan 2015 17:23:41 +0000 (16 18:23 +0100)
committerKevin Wolf <kwolf@redhat.com>
Fri, 18 Dec 2015 13:34:42 +0000 (18 14:34 +0100)
treeae6403a15d51975e87289f0e6c24cbe4cac90f1a
parent40365552c2fceacc9800ec9a87b9ead516a9a6ce
block: Allow references for backing files

For bs->file, using references to existing BDSes has been possible for a
while already. This patch enables the same for bs->backing.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
block.c
block/mirror.c
include/block/block.h