OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_RENAME2

Add the VirtioFsFuseRename() function, for sending the FUSE_RENAME2
command to the Virtio Filesystem device.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-42-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>

OvmfPkg/Include/IndustryStandard/VirtioFs.h

@@ -141,6 +141,11 @@ typedef struct {
      )                                                               \
    )
 
+//
+// Flags for VirtioFsFuseOpRename2.
+//
+#define VIRTIO_FS_FUSE_RENAME2_REQ_F_NOREPLACE BIT0
+
 //
 // FUSE operation codes.
 //
@@ -164,6 +169,7 @@ typedef enum {
   VirtioFsFuseOpFsyncDir    = 30,
   VirtioFsFuseOpCreate      = 35,
   VirtioFsFuseOpReadDirPlus = 44,
+  VirtioFsFuseOpRename2     = 45,
 } VIRTIO_FS_FUSE_OPCODE;
 
 #pragma pack (1)
@@ -398,6 +404,15 @@ typedef struct {
   UINT32                             Namelen;
   UINT32                             Type;
 } VIRTIO_FS_FUSE_DIRENTPLUS_RESPONSE;
+
+//
+// Header for VirtioFsFuseOpRename2.
+//
+typedef struct {
+  UINT64 NewDir;
+  UINT32 Flags;
+  UINT32 Padding;
+} VIRTIO_FS_FUSE_RENAME2_REQUEST;
 #pragma pack ()
 
 #endif // VIRTIO_FS_H_