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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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5
include/block/block-common.h
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@ -132,6 +132,11 @@ typedef struct BlockZoneWps {
typedef struct BlockDriverInfo {
/* in bytes, 0 if irrelevant */
int cluster_size;
/*
* A fraction of cluster_size, if supported (currently QCOW2 only); if
* disabled or unsupported, set equal to cluster_size.
*/
int subcluster_size;
/* offset at which the VM state can be saved (0 if not possible) */
int64_t vm_state_offset;
bool is_dirty;