On 8/9/19 11:13 AM, Max Reitz wrote: > There are BDS children that the general block layer code can access, > namely bs->file and bs->backing. Since the introduction of filters and > external data files, their meaning is not quite clear. bs->backing can > be a COW source, or it can be an R/W-filtered child; bs->file can be an > R/W-filtered child, it can be data and metadata storage, or it can be > just metadata storage. > > This overloading really is not helpful. This patch adds function that > retrieve the correct child for each exact purpose. Later patches in > this series will make use of them. Doing so will allow us to handle > filter nodes and external data files in a meaningful way. > > Signed-off-by: Max Reitz <mre...@redhat.com> > Reviewed-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> > --- > include/block/block_int.h | 57 ++++++++++++++++++++-- > block.c | 99 +++++++++++++++++++++++++++++++++++++++ > 2 files changed, 153 insertions(+), 3 deletions(-) >
Reviewed-by: Eric Blake <ebl...@redhat.com> -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
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