hw/9pfs: Use read-write lock for protecting fid path.
On rename we take the write lock and this ensure path
doesn't change as we operate on them.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
diff --git a/hw/9pfs/virtio-9p.h b/hw/9pfs/virtio-9p.h
index 8aeee4e..4238a76 100644
--- a/hw/9pfs/virtio-9p.h
+++ b/hw/9pfs/virtio-9p.h
@@ -8,6 +8,8 @@
#include <sys/resource.h>
#include "hw/virtio.h"
#include "fsdev/file-op-9p.h"
+#include "qemu-thread.h"
+#include "qemu-coroutine.h"
/* The feature bitmap for virtio 9P */
/* The mount point is specified in a config variable */
@@ -237,6 +239,11 @@
size_t config_size;
enum p9_proto_version proto_version;
int32_t msize;
+ /*
+ * lock ensuring atomic path update
+ * on rename.
+ */
+ CoRwlock rename_lock;
} V9fsState;
typedef struct V9fsStatState {
