It allows changing the BlockDriverState that a BlockBackend points to.
Signed-off-by: Kevin Wolf <kw...@redhat.com>
Reviewed-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Alberto Garcia <be...@igalia.com>
Reviewed-by: Fam Zheng <f...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
block/block-backend.c | 17 +++++++++++++++++
include/block/block_int.h | 2 ++
2 files changed, 19 insertions(+)
diff --git a/block/block-backend.c b/block/block-backend.c
index c2e8732..2256551 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -239,6 +239,23 @@ BlockDriverState *blk_bs(BlockBackend *blk)
}
/*
+ * Changes the BlockDriverState attached to @blk
+ */
+void blk_set_bs(BlockBackend *blk, BlockDriverState *bs)
+{
+ bdrv_ref(bs);
+
+ if (blk->bs) {
+ blk->bs->blk = NULL;
+ bdrv_unref(blk->bs);
+ }
+ assert(bs->blk == NULL);
+
+ blk->bs = bs;
+ bs->blk = blk;
+}
+
+/*
* Return @blk's DriveInfo if any, else null.
*/
DriveInfo *blk_legacy_dinfo(BlockBackend *blk)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 4598101..cfcae52 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -659,6 +659,8 @@ void backup_start(BlockDriverState *bs, BlockDriverState
*target,
BlockCompletionFunc *cb, void *opaque,
Error **errp);
+void blk_set_bs(BlockBackend *blk, BlockDriverState *bs);
+
void blk_dev_change_media_cb(BlockBackend *blk, bool load);
bool blk_dev_has_removable_media(BlockBackend *blk);
void blk_dev_eject_request(BlockBackend *blk, bool force);
--
1.8.3.1
