NFS: Remake nfsroot_mount as a permanent part of NFS client

In preparation for supporting NFSv2 and NFSv3 mount option handling in the
kernel NFS client, convert mount_clnt.c to be a permanent part of the NFS
client, instead of built only when CONFIG_ROOT_NFS is enabled.

In addition, we also replace the "struct sockaddr_in *" argument with
something more generic, to help support IPv6 at some later point.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 28 insertions, 27 deletions

diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index 2892ec843066..ee4899d96629 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -18,7 +18,7 @@
 #include <linux/nfs_fs.h>
 
 #ifdef RPC_DEBUG
-# define NFSDBG_FACILITY        NFSDBG_ROOT
+# define NFSDBG_FACILITY        NFSDBG_MOUNT
 #endif
 
 /*
@@ -28,7 +28,6 @@
 #define MOUNT_UMNT              3
  */
 
-static struct rpc_clnt *        mnt_create(struct sockaddr_in *, int, int);
 static struct rpc_program       mnt_program;
 
 struct mnt_fhstatus {
@@ -36,14 +35,21 @@ struct mnt_fhstatus {
         struct nfs_fh *         fh;
 };
 
-/*
- * Obtain an NFS file handle for the given host and path
+/**
+ * nfs_mount - Obtain an NFS file handle for the given host and path
+ * @addr: pointer to server's address
+ * @len: size of server's address
+ * @hostname: name of server host, or NULL
+ * @path: pointer to string containing export path to mount
+ * @version: mount version to use for this request
+ * @protocol: transport protocol to use for thie request
+ * @fh: pointer to location to place returned file handle
+ *
+ * Uses default timeout parameters specified by underlying transport.
  */
-int
-nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
-                int version, int protocol)
+int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path,
+              int version, int protocol, struct nfs_fh *fh)
 {
-        struct rpc_clnt         *mnt_clnt;
         struct mnt_fhstatus     result = {
                 .fh             = fh
         };
@@ -51,12 +57,23 @@ nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
                 .rpc_argp       = path,
                 .rpc_resp       = &result,
         };
+        struct rpc_create_args args = {
+                .protocol       = protocol,
+                .address        = addr,
+                .addrsize       = len,
+                .servername     = hostname,
+                .program        = &mnt_program,
+                .version        = version,
+                .authflavor     = RPC_AUTH_UNIX,
+                .flags          = RPC_CLNT_CREATE_INTR,
+        };
+        struct rpc_clnt         *mnt_clnt;
         int                     status;
 
-        dprintk("NFS:      nfs_mount(%08x:%s)\n",
-                        (unsigned)ntohl(addr->sin_addr.s_addr), path);
+        dprintk("NFS: sending MNT request for %s:%s\n",
+                (hostname ? hostname : "server"), path);
 
-        mnt_clnt = mnt_create(addr, version, protocol);
+        mnt_clnt = rpc_create(&args);
         if (IS_ERR(mnt_clnt))
                 return PTR_ERR(mnt_clnt);
 
@@ -70,22 +87,6 @@ nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
         return status < 0? status : (result.status? -EACCES : 0);
 }
 
-static struct rpc_clnt *mnt_create(struct sockaddr_in *srvaddr, int version,
-                                   int protocol)
-{
-        struct rpc_create_args args = {
-                .protocol       = protocol,
-                .address        = (struct sockaddr *)srvaddr,
-                .addrsize       = sizeof(*srvaddr),
-                .program        = &mnt_program,
-                .version        = version,
-                .authflavor     = RPC_AUTH_UNIX,
-                .flags          = RPC_CLNT_CREATE_INTR,
-        };
-
-        return rpc_create(&args);
-}
-
 /*
  * XDR encode/decode functions for MOUNT
  */