[PATCH v2 06/10] block: Convert bdrv_block_device_info into co_wrapper

[Fabiano Rosas <farosas@suse.de>]

We're converting callers of bdrv_get_allocated_file_size() to run in
coroutines because that function will be made asynchronous when called
(indirectly) from the QMP dispatcher.

This function is a candidate because it calls bdrv_query_image_info()
-> bdrv_do_query_node_info() -> bdrv_get_allocated_file_size().

It is safe to turn this is a coroutine because the code it calls is
made up of either simple accessors and string manipulation functions
[1] or it has already been determined to be safe [2].

1) bdrv_refresh_filename(), bdrv_is_read_only(),
   blk_enable_write_cache(), bdrv_cow_bs(), blk_get_public(),
   throttle_group_get_name(), bdrv_write_threshold_get(),
   bdrv_query_dirty_bitmaps(), throttle_group_get_config(),
   bdrv_filter_or_cow_bs(), bdrv_skip_implicit_filters()

2) bdrv_do_query_node_info() (see previous commit);

Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 block/qapi.c         |  8 ++++----
 include/block/qapi.h | 12 ++++++++----
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/block/qapi.c b/block/qapi.c
index a2e71edaff..20660e15d6 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -41,10 +41,10 @@
 #include "qemu/qemu-print.h"
 #include "sysemu/block-backend.h"
 
-BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
-                                        BlockDriverState *bs,
-                                        bool flat,
-                                        Error **errp)
+BlockDeviceInfo *coroutine_fn bdrv_co_block_device_info(BlockBackend *blk,
+                                                        BlockDriverState *bs,
+                                                        bool flat,
+                                                        Error **errp)
 {
     ImageInfo **p_image_info;
     ImageInfo *backing_info;
diff --git a/include/block/qapi.h b/include/block/qapi.h
index 7035bcd1ae..5cb0202791 100644
--- a/include/block/qapi.h
+++ b/include/block/qapi.h
@@ -30,10 +30,14 @@
 #include "block/snapshot.h"
 #include "qapi/qapi-types-block-core.h"
 
-BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
-                                        BlockDriverState *bs,
-                                        bool flat,
-                                        Error **errp);
+BlockDeviceInfo *coroutine_fn bdrv_co_block_device_info(BlockBackend *blk,
+                                                        BlockDriverState *bs,
+                                                        bool flat,
+                                                        Error **errp);
+BlockDeviceInfo *co_wrapper bdrv_block_device_info(BlockBackend *blk,
+                                                   BlockDriverState *bs,
+                                                   bool flat,
+                                                   Error **errp);
 int bdrv_query_snapshot_info_list(BlockDriverState *bs,
                                   SnapshotInfoList **p_list,
                                   Error **errp);
-- 
2.35.3