virtio: order index/descriptor reads

[qemu.git] / qemu-aio.h

diff --git a/qemu-aio.h b/qemu-aio.h
index 3bdd749f8054cba89e6d989cbaba96b9f7327e44..bfdd35f02cfa6e61c09507f28c763af39022b498 100644 (file)
--- a/qemu-aio.h
+++ b/qemu-aio.h
@@ -17,14 +17,30 @@
 #include "qemu-common.h"
 #include "qemu-char.h"
 
+typedef struct BlockDriverAIOCB BlockDriverAIOCB;
+typedef void BlockDriverCompletionFunc(void *opaque, int ret);
+
+typedef struct AIOPool {
+    void (*cancel)(BlockDriverAIOCB *acb);
+    int aiocb_size;
+    BlockDriverAIOCB *free_aiocb;
+} AIOPool;
+
+struct BlockDriverAIOCB {
+    AIOPool *pool;
+    BlockDriverState *bs;
+    BlockDriverCompletionFunc *cb;
+    void *opaque;
+    BlockDriverAIOCB *next;
+};
+
+void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
+                   BlockDriverCompletionFunc *cb, void *opaque);
+void qemu_aio_release(void *p);
+
 /* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
 typedef int (AioFlushHandler)(void *opaque);
 
-/* Runs all currently allowed AIO callbacks of completed requests in the
- * respective AIO backend. Returns 0 if no requests was handled, non-zero
- * if at least one queued request was handled. */
-typedef int (AioProcessQueue)(void *opaque);
-
 /* Flush any pending AIO operation. This function will block until all
  * outstanding AIO operations have been completed or cancelled. */
 void qemu_aio_flush(void);
@@ -32,15 +48,10 @@ void qemu_aio_flush(void);
 /* Wait for a single AIO completion to occur.  This function will wait
  * until a single AIO event has completed and it will ensure something
  * has moved before returning. This can issue new pending aio as
- * result of executing I/O completion or bh callbacks. */
-void qemu_aio_wait(void);
-
-/*
- * Runs all currently allowed AIO callbacks of completed requests. Returns 0
- * if no requests were handled, non-zero if at least one request was
- * processed.
- */
-int qemu_aio_process_queue(void);
+ * result of executing I/O completion or bh callbacks.
+ *
+ * Return whether there is still any pending AIO operation.  */
+bool qemu_aio_wait(void);
 
 /* Register a file descriptor and associated callbacks.  Behaves very similarly
  * to qemu_set_fd_handler2.  Unlike qemu_set_fd_handler2, these callbacks will
@@ -53,7 +64,6 @@ int qemu_aio_set_fd_handler(int fd,
                             IOHandler *io_read,
                             IOHandler *io_write,
                             AioFlushHandler *io_flush,
-                            AioProcessQueue *io_process_queue,
                             void *opaque);
 
 #endif