From 53622e928682d08acafb27ce973a654ef7814c4d Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Wed, 27 Oct 2021 11:57:35 +0100
Subject: [PATCH] vddk: Add read, write and wait asynchronous functions

These functions added in VDDK 6.0 - 6.5 implement asynchronous read
and write.

Acked-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit ad53e7becafed6ca3573795a79c534281fe9c274)
---
 plugins/vddk/vddk-structs.h |  3 +++
 plugins/vddk/vddk-stubs.h   | 19 ++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/plugins/vddk/vddk-structs.h b/plugins/vddk/vddk-structs.h
index aeb5bfd0..e97f017c 100644
--- a/plugins/vddk/vddk-structs.h
+++ b/plugins/vddk/vddk-structs.h
@@ -43,6 +43,7 @@
 
 typedef uint64_t VixError;
 #define VIX_OK 0
+#define VIX_ASYNC 25000
 
 #define VIXDISKLIB_FLAG_OPEN_UNBUFFERED 1
 #define VIXDISKLIB_FLAG_OPEN_SINGLE_LINK 2
@@ -61,6 +62,8 @@ typedef void *VixDiskLibHandle;
 
 typedef void VixDiskLibGenericLogFunc (const char *fmt, va_list args);
 
+typedef void (*VixDiskLibCompletionCB) (void *data, VixError result);
+
 enum VixDiskLibCredType {
   VIXDISKLIB_CRED_UID       = 1,
   VIXDISKLIB_CRED_SESSIONID = 2,
diff --git a/plugins/vddk/vddk-stubs.h b/plugins/vddk/vddk-stubs.h
index a94df9cd..66353691 100644
--- a/plugins/vddk/vddk-stubs.h
+++ b/plugins/vddk/vddk-stubs.h
@@ -103,10 +103,27 @@ STUB (VixDiskLib_Write,
        uint64_t start_sector, uint64_t nr_sectors,
        const unsigned char *buf));
 
-/* Added in VDDK 6.0, this will be NULL in earlier versions. */
+/* Added in VDDK 6.0, these will be NULL in earlier versions. */
 OPTIONAL_STUB (VixDiskLib_Flush,
                VixError,
                (VixDiskLibHandle handle));
+OPTIONAL_STUB (VixDiskLib_ReadAsync,
+               VixError,
+               (VixDiskLibHandle handle,
+                uint64_t start_sector, uint64_t nr_sectors,
+                unsigned char *buf,
+                VixDiskLibCompletionCB callback, void *data));
+OPTIONAL_STUB (VixDiskLib_WriteAsync,
+               VixError,
+               (VixDiskLibHandle handle,
+                uint64_t start_sector, uint64_t nr_sectors,
+                const unsigned char *buf,
+                VixDiskLibCompletionCB callback, void *data));
+
+/* Added in VDDK 6.5, this will be NULL in earlier versions. */
+OPTIONAL_STUB (VixDiskLib_Wait,
+               VixError,
+               (VixDiskLibHandle handle));
 
 /* Added in VDDK 6.7, these will be NULL for earlier versions: */
 OPTIONAL_STUB (VixDiskLib_QueryAllocatedBlocks,
-- 
2.31.1