diff options
| author | Max Reitz <mreitz@redhat.com> | 2015-02-05 13:58:11 -0500 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2015-02-16 15:07:18 +0000 |
| commit | ca49a4fdb39d7b00b20e8500cba11aedc87755bd (patch) | |
| tree | d609f7482ef9a1f6eda662e8be810250e140a898 /include/sysemu | |
| parent | 1ef01253eb90d0c69129c817e85fa92f9d45602a (diff) | |
block: Add blk_new_open()
blk_new_with_bs() creates a BlockBackend with an empty BlockDriverState
attached to it. Empty BDSs are not nice, therefore add an alternative
function which combines blk_new_with_bs() with bdrv_open().
Note: In contrast to bdrv_open() which takes a BlockDriver parameter,
blk_new_open() does not take such a parameter. This is because
bdrv_open() opens a BlockDriverState, therefore it is natural to be able
to set the BlockDriver for that BDS. The fact that bdrv_open() can open
more than a single BDS is merely some form of a byproduct.
blk_new_open() on the other hand is intended to be used to create a
whole tree of BlockDriverStates. Therefore, setting a single BlockDriver
does not make much sense. Instead, the drivers to be used for each of
the nodes must be configured through the "options" QDict; including the
driver of the root BDS.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1423162705-32065-3-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/sysemu')
| -rw-r--r-- | include/sysemu/block-backend.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index 4ef0407536..2e8ebb2535 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -62,6 +62,9 @@ typedef struct BlockDevOps { BlockBackend *blk_new(const char *name, Error **errp); BlockBackend *blk_new_with_bs(const char *name, Error **errp); +BlockBackend *blk_new_open(const char *name, const char *filename, + const char *reference, QDict *options, int flags, + Error **errp); void blk_ref(BlockBackend *blk); void blk_unref(BlockBackend *blk); const char *blk_name(BlockBackend *blk); |