1 files changed, 23 insertions, 4 deletions

diff --git a/include/block/block_int.h b/include/block/block_int.h
index e96e9ada57..e7ff58419c 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -62,8 +62,6 @@
 enum BdrvTrackedRequestType {
     BDRV_TRACKED_READ,
     BDRV_TRACKED_WRITE,
-    BDRV_TRACKED_FLUSH,
-    BDRV_TRACKED_IOCTL,
     BDRV_TRACKED_DISCARD,
 };
 
@@ -445,7 +443,7 @@ struct BlockDriverState {
                          note this is a reference count */
 
     CoQueue flush_queue;            /* Serializing flush queue */
-    BdrvTrackedRequest *active_flush_req; /* Flush request in flight */
+    bool active_flush_req;          /* Flush request in flight? */
     unsigned int write_gen;         /* Current data generation */
     unsigned int flushed_gen;       /* Flushed write generation */
 
@@ -473,9 +471,12 @@ struct BlockDriverState {
     /* Callback before write request is processed */
     NotifierWithReturnList before_write_notifiers;
 
-    /* number of in-flight serialising requests */
+    /* number of in-flight requests; overall and serialising */
+    unsigned int in_flight;
     unsigned int serialising_in_flight;
 
+    bool wakeup;
+
     /* Offset after the highest byte written to */
     uint64_t wr_highest_offset;
 
@@ -634,6 +635,21 @@ void bdrv_remove_aio_context_notifier(BlockDriverState *bs,
                                       void (*aio_context_detached)(void *),
                                       void *opaque);
 
+/**
+ * bdrv_wakeup:
+ * @bs: The BlockDriverState for which an I/O operation has been completed.
+ *
+ * Wake up the main thread if it is waiting on BDRV_POLL_WHILE.  During
+ * synchronous I/O on a BlockDriverState that is attached to another
+ * I/O thread, the main thread lets the I/O thread's event loop run,
+ * waiting for the I/O operation to complete.  A bdrv_wakeup will wake
+ * up the main thread if necessary.
+ *
+ * Manual calls to bdrv_wakeup are rarely necessary, because
+ * bdrv_dec_in_flight already calls it.
+ */
+void bdrv_wakeup(BlockDriverState *bs);
+
 #ifdef _WIN32
 int is_windows_drive(const char *filename);
 #endif
@@ -787,6 +803,9 @@ bool bdrv_requests_pending(BlockDriverState *bs);
 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out);
 void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in);
 
+void bdrv_inc_in_flight(BlockDriverState *bs);
+void bdrv_dec_in_flight(BlockDriverState *bs);
+
 void blockdev_close_all_bdrv_states(void);
 
 #endif /* BLOCK_INT_H */