nfs41: add mount command option minorversion

mount -t nfs4 -o minorversion=[0|1] specifies whether to use 4.0 or 4.1.
By default, the minorversion is set to 0.

Signed-off-by: Mike Sager <sager@netapp.com>
[set default minorversion to 0 as per Trond and SteveD's request]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index e4d6a8348adf..ffa6bd54d439 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -44,6 +44,7 @@ struct nfs_parsed_mount_data {
         unsigned int            auth_flavor_len;
         rpc_authflavor_t        auth_flavors[1];
         char                    *client_address;
+        unsigned int            minorversion;
         char                    *fscache_uniq;
 
         struct {
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index d2d67781c579..5a8fdc791cc1 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -90,6 +90,7 @@ enum {
         Opt_mountport,
         Opt_mountvers,
         Opt_nfsvers,
+        Opt_minorversion,
 
         /* Mount options that take string arguments */
         Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
@@ -155,6 +156,7 @@ static const match_table_t nfs_mount_option_tokens = {
         { Opt_mountvers, "mountvers=%u" },
         { Opt_nfsvers, "nfsvers=%u" },
         { Opt_nfsvers, "vers=%u" },
+        { Opt_minorversion, "minorversion=%u" },
 
         { Opt_sec, "sec=%s" },
         { Opt_proto, "proto=%s" },
@@ -1211,6 +1213,13 @@ static int nfs_parse_mount_options(char *raw,
                                 nfs_parse_invalid_value("nfsvers");
                         }
                         break;
+                case Opt_minorversion:
+                        if (match_int(args, &option))
+                                return 0;
+                        if (option < 0 || option > NFS4_MAX_MINOR_VERSION)
+                                return 0;
+                        mnt->minorversion = option;
+                        break;
 
                 /*
                  * options that take text values
@@ -2261,6 +2270,7 @@ static int nfs4_validate_mount_data(void *options,
         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
         args->auth_flavors[0]   = RPC_AUTH_UNIX;
         args->auth_flavor_len   = 0;
+        args->minorversion      = 0;
 
         switch (data->version) {
         case 1: