commit 69da3b0b47c8f6016e9109fcfa608e9e7e99bc05
author Fam Zheng <famz@redhat.com> Fri Apr 03 22:05:19 2015 +0800
committer Kevin Wolf <kwolf@redhat.com> Tue Apr 28 15:36:09 2015 +0200
tree 6a012964514769d9345da94a20bd8807401c7a64
parent 751ebd76e654bd1e65da08ecf694325282b4cfcc

block: Pause block jobs in bdrv_drain_all

This is necessary to suppress more IO requests from being generated from
block job coroutines.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 1428069921-2957-3-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block.c

diff --git a/block.c b/block.c
index 670d7e4..70aed80 100644
--- a/block.c
+++ b/block.c
@@ -2040,6 +2040,16 @@
     bool busy = true;
     BlockDriverState *bs;
 
+    QTAILQ_FOREACH(bs, &bdrv_states, device_list) {
+        AioContext *aio_context = bdrv_get_aio_context(bs);
+
+        aio_context_acquire(aio_context);
+        if (bs->job) {
+            block_job_pause(bs->job);
+        }
+        aio_context_release(aio_context);
+    }
+
     while (busy) {
         busy = false;
 
@@ -2051,6 +2061,16 @@
             aio_context_release(aio_context);
         }
     }
+
+    QTAILQ_FOREACH(bs, &bdrv_states, device_list) {
+        AioContext *aio_context = bdrv_get_aio_context(bs);
+
+        aio_context_acquire(aio_context);
+        if (bs->job) {
+            block_job_resume(bs->job);
+        }
+        aio_context_release(aio_context);
+    }
 }
 
 /* make a BlockDriverState anonymous by removing from bdrv_state and