1 files changed, 57 insertions, 0 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 7e56411e55fc..48db52a7067a 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -992,6 +992,63 @@ out_unknown:
 }
 
 /*
+ * Use the remote server's MOUNT service to request the NFS file handle
+ * corresponding to the provided path.
+ */
+static int nfs_try_mount(struct nfs_parsed_mount_data *args,
+                         struct nfs_fh *root_fh)
+{
+        struct sockaddr_in sin;
+        int status;
+
+        if (args->mount_server.version == 0) {
+                if (args->flags & NFS_MOUNT_VER3)
+                        args->mount_server.version = NFS_MNT3_VERSION;
+                else
+                        args->mount_server.version = NFS_MNT_VERSION;
+        }
+
+        /*
+         * Construct the mount server's address.
+         */
+        if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY)
+                sin = args->mount_server.address;
+        else
+                sin = args->nfs_server.address;
+        if (args->mount_server.port == 0) {
+                status = rpcb_getport_sync(&sin,
+                                           args->mount_server.program,
+                                           args->mount_server.version,
+                                           args->mount_server.protocol);
+                if (status < 0)
+                        goto out_err;
+                sin.sin_port = htons(status);
+        } else
+                sin.sin_port = htons(args->mount_server.port);
+
+        /*
+         * Now ask the mount server to map our export path
+         * to a file handle.
+         */
+        status = nfs_mount((struct sockaddr *) &sin,
+                           sizeof(sin),
+                           args->nfs_server.hostname,
+                           args->nfs_server.export_path,
+                           args->mount_server.version,
+                           args->mount_server.protocol,
+                           root_fh);
+        if (status < 0)
+                goto out_err;
+
+        return status;
+
+out_err:
+        dfprintk(MOUNT, "NFS: unable to contact server on host "
+                 NIPQUAD_FMT "\n", NIPQUAD(sin.sin_addr.s_addr));
+        return status;
+}
+
+/*
  * Validate the NFS2/NFS3 mount data
  * - fills in the mount root filehandle
  */