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block: add subcluster_size field to BlockDriverInfo

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This is going to be used in the subsequent commit as requests alignment
(in particular, during copy-on-read).  This value only makes sense for
the formats which support subclusters (currently QCOW2 only).  If this
field isn't set by driver's own bdrv_get_info() implementation, we
simply set it equal to the cluster size thus treating each cluster as
having a single subcluster.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230711172553.234055-2-andrey.drobyshev@virtuozzo.com>
This commit is contained in:
Andrey Drobyshev 2023-07-11 20:25:51 +03:00 • committed by Stefan Hajnoczi
parent f187609f27
commit c54483b6f4
3 changed files with 13 additions and 0 deletions
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7
block.c
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@ -6480,6 +6480,13 @@ int coroutine_fn bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
}
memset(bdi, 0, sizeof(*bdi));
ret = drv->bdrv_co_get_info(bs, bdi);
if (bdi->subcluster_size == 0) {
/*
* If the driver left this unset, subclusters are not supported.
* Then it is safe to treat each cluster as having only one subcluster.
*/
bdi->subcluster_size = bdi->cluster_size;
}
if (ret < 0) {
return ret;
}