[Qemu-devel] [RFC v2 12/15] Make bdrv_flush coroutine only and add bdrv_sync_flush

[Charlie Shepherd <charlie@ctshepherd.com>]

This patch renames the coroutine only bdrv_co_flush to bdrv_flush and the
original bdrv_flush to bdrv_sync_flush. bdrv_sync_flush is synchronous only.
This patch also converts a caller in block/mirror.c to coroutine_fn.

Signed-off-by: Charlie Shepherd <charlie@ctshepherd.com>
---
 block.c               | 12 +++---------
 block/mirror.c        |  4 ++--
 include/block/block.h |  4 ++--
 3 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/block.c b/block.c
index 6995d3f..27339af 100644
--- a/block.c
+++ b/block.c
@@ -4078,7 +4078,7 @@ static void coroutine_fn bdrv_flush_co_entry(void *opaque)
     rwco->ret = bdrv_co_flush(rwco->bs);
 }
 
-int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
+int coroutine_fn bdrv_flush(BlockDriverState *bs)
 {
     int ret;
 
@@ -4166,7 +4166,7 @@ void bdrv_clear_incoming_migration_all(void)
     }
 }
 
-int bdrv_flush(BlockDriverState *bs)
+int bdrv_sync_flush(BlockDriverState *bs)
 {
     Coroutine *co;
     RwCo rwco = {
@@ -4174,13 +4174,7 @@ int bdrv_flush(BlockDriverState *bs)
         .ret = NOT_DONE,
     };
 
-    if (qemu_in_coroutine()) {
-        /* Fast-path if already in coroutine context */
-        bdrv_flush_co_entry(&rwco);
-        return rwco.ret;
-    } else {
-        return bdrv_sync_rwco(bdrv_flush_co_entry, &rwco);
-    }
+    return bdrv_sync_rwco(bdrv_flush_co_entry, &rwco);
 }
 
 static void coroutine_fn bdrv_discard_co_entry(void *opaque)
diff --git a/block/mirror.c b/block/mirror.c
index bed4a7e..3d5da7e 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -282,7 +282,7 @@ static void mirror_free_init(MirrorBlockJob *s)
     }
 }
 
-static void mirror_drain(MirrorBlockJob *s)
+static void coroutine_fn mirror_drain(MirrorBlockJob *s)
 {
     while (s->in_flight > 0) {
         qemu_coroutine_yield();
@@ -390,7 +390,7 @@ static void coroutine_fn mirror_run(void *opaque)
         should_complete = false;
         if (s->in_flight == 0 && cnt == 0) {
             trace_mirror_before_flush(s);
-            ret = bdrv_flush(s->target);
+            ret = bdrv_co_flush(s->target);
             if (ret < 0) {
                 if (mirror_error_action(s, false, -ret) == BDRV_ACTION_REPORT) {
                     goto immediate_exit;
diff --git a/include/block/block.h b/include/block/block.h
index 65d8864..370b4c6 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -273,8 +273,8 @@ void bdrv_invalidate_cache_all(void);
 void bdrv_clear_incoming_migration_all(void);
 
 /* Ensure contents are flushed to disk.  */
-int bdrv_flush(BlockDriverState *bs);
-int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
+int coroutine_fn bdrv_flush(BlockDriverState *bs);
+int bdrv_sync_flush(BlockDriverState *bs);
 int bdrv_flush_all(void);
 void bdrv_close_all(void);
 void bdrv_drain_all(void);
-- 
1.8.3.2