diff options
| author | Andrey Drobyshev <andrey.drobyshev@virtuozzo.com> | 2023-07-11 20:25:51 +0300 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2023-08-30 07:39:10 -0400 |
| commit | c54483b6f45a0c84e230728a1a9e7adf90345e15 (patch) | |
| tree | 5bf9bacf290a472997dc5cb756125cf5eb92ba9f /include | |
| parent | f187609f27b261702a17f79d20bf252ee0d4f9cd (diff) | |
| download | qemu-c54483b6f45a0c84e230728a1a9e7adf90345e15.zip qemu-c54483b6f45a0c84e230728a1a9e7adf90345e15.tar.gz qemu-c54483b6f45a0c84e230728a1a9e7adf90345e15.tar.bz2 | |
block: add subcluster_size field to BlockDriverInfo
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/block-common.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/block/block-common.h b/include/block/block-common.h index e15395f..df5ffc8 100644 --- a/include/block/block-common.h +++ b/include/block/block-common.h @@ -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; |