From: pbrook <pbrook>
Date: Sun, 3 Sep 2006 12:08:37 +0000 (+0000)
Subject: Flush IO requests before savevm (original patch by Blue Swirl).
X-Git-Tag: release_0_9_0-iwjtag~261
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=78944821828e7debfe6954445049c7ba85d970b1;p=qemu-xen-3.4-testing.git

Flush IO requests before savevm (original patch by Blue Swirl).
---

diff --git a/block-raw.c b/block-raw.c
index 3ed4b32d..3a2843c5 100644
--- a/block-raw.c
+++ b/block-raw.c
@@ -247,6 +247,17 @@ void qemu_aio_poll(void)
  the_end: ;
 }
 
+/* Wait for all IO requests to complete.  */
+void qemu_aio_flush(void)
+{
+    qemu_aio_wait_start();
+    qemu_aio_poll();
+    while (first_aio) {
+        qemu_aio_wait();
+    }
+    qemu_aio_wait_end();
+}
+
 /* wait until at least one AIO was handled */
 static sigset_t wait_oset;
 
diff --git a/vl.c b/vl.c
index 77190309..32c99436 100644
--- a/vl.c
+++ b/vl.c
@@ -4551,6 +4551,9 @@ void do_savevm(const char *name)
         return;
     }
 
+    /* ??? Should this occur after vm_stop?  */
+    qemu_aio_flush();
+
     saved_vm_running = vm_running;
     vm_stop(0);
     
@@ -4641,6 +4644,9 @@ void do_loadvm(const char *name)
         return;
     }
     
+    /* Flush all IO requests so they don't interfere with the new state.  */
+    qemu_aio_flush();
+
     saved_vm_running = vm_running;
     vm_stop(0);
 
diff --git a/vl.h b/vl.h
index bd1e6673..14116fa7 100644
--- a/vl.h
+++ b/vl.h
@@ -580,6 +580,7 @@ void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 
 void qemu_aio_init(void);
 void qemu_aio_poll(void);
+void qemu_aio_flush(void);
 void qemu_aio_wait_start(void);
 void qemu_aio_wait(void);
 void qemu_aio_wait_end(void);