@@ -312,6 +312,22 @@ void blk_hide_on_behalf_of_do_drive_del(BlockBackend *blk)
}
/*
+ * Disassociates the currently associated BlockDriverState from @blk.
+ */
+void blk_remove_bs(BlockBackend *blk)
+{
+ if (!blk->bs) {
+ return;
+ }
+
+ blk_update_root_state(blk);
+
+ bdrv_unref(blk->bs);
+ blk->bs->blk = NULL;
+ blk->bs = NULL;
+}
+
+/*
* Associates a new BlockDriverState with @blk.
*/
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
@@ -321,9 +337,13 @@ void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
}
assert(!blk->bs);
- assert(!bs->blk);
bdrv_ref(bs);
blk->bs = bs;
+
+ if (bs->blk) {
+ blk_remove_bs(bs->blk);
+ }
+
bs->blk = blk;
}
@@ -72,6 +72,7 @@ BlockBackend *blk_by_name(const char *name);
BlockBackend *blk_next(BlockBackend *blk);
BlockDriverState *blk_bs(BlockBackend *blk);
+void blk_remove_bs(BlockBackend *blk);
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
void blk_hide_on_behalf_of_do_drive_del(BlockBackend *blk);
This function removes the BlockDriverState associated with the given BlockBackend from that BB and sets the BDS pointer in the BB to NULL. Signed-off-by: Max Reitz <mreitz@redhat.com> --- block/block-backend.c | 22 +++++++++++++++++++++- include/sysemu/block-backend.h | 1 + 2 files changed, 22 insertions(+), 1 deletion(-)