[PATCH 11/12] block: allow to call bdrv_open() with an opaque

["Marc-André Lureau" <marcandre.lureau@xxxxxxxxx>]

If the block driver already has a bs->opaque when calling bdrv_open(),
pass it down to the file driver.

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
---
 block.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/block.c b/block.c
index bdffb42..ff9cb0b 100644
--- a/block.c
+++ b/block.c
@@ -1041,6 +1041,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
     int ret;
     BlockDriverState *file = NULL;
     QDict *file_options = NULL;
+    void *backing_opaque = NULL;
 
     /* NULL means an empty set of options */
     if (options == NULL) {
@@ -1064,6 +1065,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
             goto fail;
         }
 
+        backing_opaque = bs->opaque;
+        bs->opaque = NULL;
         if (total_size == -1) {
             bs1 = bdrv_new_int("", NULL, NULL);
             ret = bdrv_open(bs1, filename, NULL, 0, drv);
@@ -1088,7 +1091,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
 
     extract_subqdict(options, &file_options, "file.");
     ret = bdrv_file_open_int(&file, filename, file_options,
-                             bdrv_open_flags(bs, flags), bs, NULL);
+                             bdrv_open_flags(bs, flags), bs, bs->opaque);
+    bs->opaque = NULL;
     if (ret < 0) {
         goto fail;
     }
@@ -1118,7 +1122,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
         QDict *backing_options;
 
         extract_subqdict(options, &backing_options, "backing.");
-        ret = bdrv_open_backing_file_int(bs, backing_options, NULL);
+        ret = bdrv_open_backing_file_int(bs, backing_options, backing_opaque);
         if (ret < 0) {
             goto close_and_fail;
         }
-- 
1.8.3.rc1.49.g8d97506

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