nfs42: add NFS_IOC_CLONE_RANGE ioctl

It follows btrfs BTRFS_IOC_CLONE_RANGE lead on ioctl number and
arguments.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/uapi/linux/nfs.h b/include/uapi/linux/nfs.h
index d85748d3564d..c6b86cc404f8 100644
--- a/include/uapi/linux/nfs.h
+++ b/include/uapi/linux/nfs.h
@@ -33,7 +33,14 @@
 
 /* NFS ioctls */
 /* Let's follow btrfs lead on CLONE to avoid messing userspace */
-#define NFS_IOC_CLONE   _IOW(0x94, 9, int)
+#define NFS_IOC_CLONE           _IOW(0x94, 9, int)
+#define NFS_IOC_CLONE_RANGE     _IOW(0x94, 13, int)
+
+struct nfs_ioctl_clone_range_args {
+        __s64 src_fd;
+        __u64 src_off, count;
+        __u64 dst_off;
+};
 
 /*
  * NFS stats. The good thing with these values is that NFSv3 errors are