Since qemu 2.10, qemu locks all drives even when they are opened
readonly. This disables this locking in this safe case.
Incomplete fix for
https://bugzilla.redhat.com/show_bug.cgi?id=1417306
---
lib/launch-direct.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lib/launch-direct.c b/lib/launch-direct.c
index 3b848165c..e5465539d 100644
--- a/lib/launch-direct.c
+++ b/lib/launch-direct.c
@@ -221,8 +221,11 @@ add_drive_standard_params (guestfs_h *g, struct backend_direct_data
*data,
file = guestfs_int_drive_source_qemu_param (g, &drv->src);
append_list_format ("file=%s", file);
- if (drv->readonly)
+ if (drv->readonly) {
append_list ("snapshot=on");
+ if (guestfs_int_version_ge (&data->qemu_version, 2, 10, 0))
+ append_list ("locking=off");
+ }
append_list_format ("cache=%s",
drv->cachemode ? drv->cachemode : "writeback");
if (drv->src.format)
--
2.13.2