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| H A D | block.c | diff 081e465026769a24b86ba2e6a77709cfea33f16a Wed Jun 12 11:14:13 CDT 2019 Max Reitz <mreitz@redhat.com> block: Improve get_allocated_file_size's default
There are two practical problems with bdrv_get_allocated_file_size()'s
default right now:
(1) For drivers with children, we should generally sum all their sizes
instead of just passing the request through to bs->file. The latter
is good for filters, but not so much for format drivers.
(2) Filters need not have bs->file, so we should actually go to the
filtered child instead of hard-coding bs->file.
Fix this by splitting the default implementation into three branches:
(1) For filter drivers: Return the size of the filtered child
(2) For protocol drivers: Return -ENOTSUP, because the default
implementation cannot make a guess
(3) For other drivers: Sum all data-bearing children's sizes
Signed-off-by: Max Reitz <mreitz@redhat.com>
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