diff mbox

[31/50] block: Add blk_insert_bs()

Message ID 1422288204-29271-32-git-send-email-mreitz@redhat.com
State New
Headers show

Commit Message

Max Reitz Jan. 26, 2015, 4:03 p.m. UTC 
This function associates the given BlockDriverState with the given
BlockBackend.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/block-backend.c          | 16 ++++++++++++++++
 include/sysemu/block-backend.h |  1 +
 2 files changed, 17 insertions(+)
diff mbox

Patch

diff --git a/block/block-backend.c b/block/block-backend.c
index 760558f..656ebfc 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -312,6 +312,22 @@  void blk_hide_on_behalf_of_do_drive_del(BlockBackend *blk)
 }
 
 /*
+ * Associates a new BlockDriverState with @blk.
+ */
+void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
+{
+    if (bs->blk == blk) {
+        return;
+    }
+
+    assert(!blk->bs);
+    assert(!bs->blk);
+    bdrv_ref(bs);
+    blk->bs = bs;
+    bs->blk = blk;
+}
+
+/*
  * Attach device model @dev to @blk.
  * Return 0 on success, -EBUSY when a device model is attached already.
  */
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index afb62e1..b6cf5bf 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -72,6 +72,7 @@  BlockBackend *blk_by_name(const char *name);
 BlockBackend *blk_next(BlockBackend *blk);
 
 BlockDriverState *blk_bs(BlockBackend *blk);
+void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
 
 void blk_hide_on_behalf_of_do_drive_del(BlockBackend *blk);