[Qemu-devel] [PATCH 38/56] dataplane: refuse to start if device is already in use

[Michael Roth]

From: Stefan Hajnoczi <address@hidden>

Dataplane must check whether a block device is in use before launching
the dataplane thread.  This is necessary since the thread does not
synchronize with the main loop and I/O requests could cause corruption.

One example is when a drive is added and a block job is started before
hotplugging the virtio-blk-pci adapter.  In this case we must not use
dataplane mode.

Cc: address@hidden
Reviewed-by: Kevin Wolf <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
(cherry picked from commit b0f2027cde31c645524256763672e09eeb204a9a)

Signed-off-by: Michael Roth <address@hidden>
---
 hw/block/dataplane/virtio-blk.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index 0356665..a58cc53 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -418,6 +418,14 @@ bool virtio_blk_data_plane_create(VirtIODevice *vdev, 
VirtIOBlkConf *blk,
         return false;
     }
 
+    /* If dataplane is (re-)enabled while the guest is running there could be
+     * block jobs that can conflict.
+     */
+    if (bdrv_in_use(blk->conf.bs)) {
+        error_report("cannot start dataplane thread while device is in use");
+        return false;
+    }
+
     fd = raw_get_aio_fd(blk->conf.bs);
     if (fd < 0) {
         error_report("drive is incompatible with x-data-plane, "
-- 
1.7.9.5