NFS: Add new 'mountaddr=' mount option

I got the 'mounthost=' option wrong - it shouldn't look for an address
value, but rather a hostname value.  However, the in-kernel mount client
and NFS client cannot resolve a hostname by themselves; they rely on
user-land to pass in the resolved address.

Create a new mount option that does take an address so that the mount
program's address can be passed in.  The mount hostname is now ignored
by the kernel.

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

1 files changed, 5 insertions, 3 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 094d2f832c3c..a955821b8499 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -73,6 +73,7 @@ struct nfs_parsed_mount_data {
 
         struct {
                 struct sockaddr_in      address;
+                char                    *hostname;
                 unsigned int            program;
                 unsigned int            version;
                 unsigned short          port;
@@ -116,7 +117,7 @@ enum {
 
         /* Mount options that take string arguments */
         Opt_sec, Opt_proto, Opt_mountproto,
-        Opt_addr, Opt_mounthost, Opt_clientaddr,
+        Opt_addr, Opt_mountaddr, Opt_clientaddr,
 
         /* Mount options that are ignored */
         Opt_userspace, Opt_deprecated,
@@ -175,7 +176,8 @@ static match_table_t nfs_mount_option_tokens = {
         { Opt_mountproto, "mountproto=%s" },
         { Opt_addr, "addr=%s" },
         { Opt_clientaddr, "clientaddr=%s" },
-        { Opt_mounthost, "mounthost=%s" },
+        { Opt_userspace, "mounthost=%s" },
+        { Opt_mountaddr, "mountaddr=%s" },
 
         { Opt_err, NULL }
 };
@@ -961,7 +963,7 @@ static int nfs_parse_mount_options(char *raw,
                                 goto out_nomem;
                         mnt->client_address = string;
                         break;
-                case Opt_mounthost:
+                case Opt_mountaddr:
                         string = match_strdup(args);
                         if (string == NULL)
                                 goto out_nomem;