When mounting an "nfs" type file system, recognize "v4," "vers=4," or
"nfsvers=4" mount options. For nfsvers=4, cause the file system to
behave just like "nfs4," but remain "nfs".
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfs/internal.h | 1 +
fs/nfs/super.c | 42 +++++++++++++++++++++++++++++++++++++++++-
include/linux/nfs4.h | 1 +
3 files changed, 43 insertions(+), 1 deletions(-)
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index d30b4fb..da132dc 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -68,6 +68,7 @@ struct nfs_parsed_mount_data {
unsigned int auth_flavor_len;
rpc_authflavor_t auth_flavors[1];
char *client_address;
+ unsigned int version;
unsigned int minorversion;
char *fscache_uniq;
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 4bcdfd4..70da441 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -73,7 +73,7 @@ enum {
Opt_cto, Opt_nocto,
Opt_ac, Opt_noac,
Opt_lock, Opt_nolock,
- Opt_v2, Opt_v3,
+ Opt_v2, Opt_v3, Opt_v4,
Opt_udp, Opt_tcp, Opt_rdma,
Opt_acl, Opt_noacl,
Opt_rdirplus, Opt_nordirplus,
@@ -127,6 +127,7 @@ static const match_table_t nfs_mount_option_tokens = {
{ Opt_nolock, "nolock" },
{ Opt_v2, "v2" },
{ Opt_v3, "v3" },
+ { Opt_v4, "v4" },
{ Opt_udp, "udp" },
{ Opt_tcp, "tcp" },
{ Opt_rdma, "rdma" },
@@ -933,10 +934,18 @@ static int nfs_parse_mount_options(char *raw,
break;
case Opt_v2:
mnt->flags &= ~NFS_MOUNT_VER3;
+ mnt->version = 2;
break;
case Opt_v3:
mnt->flags |= NFS_MOUNT_VER3;
+ mnt->version = 3;
break;
+#ifdef CONFIG_NFS_V4
+ case Opt_v4:
+ mnt->flags &= ~NFS_MOUNT_VER3;
+ mnt->version = 4;
+ break;
+#endif
case Opt_udp:
mnt->flags &= ~NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
@@ -1150,10 +1159,18 @@ static int nfs_parse_mount_options(char *raw,
switch (option) {
case NFS2_VERSION:
mnt->flags &= ~NFS_MOUNT_VER3;
+ mnt->version = 2;
break;
case NFS3_VERSION:
mnt->flags |= NFS_MOUNT_VER3;
+ mnt->version = 3;
+ break;
+#ifdef CONFIG_NFS_V4
+ case NFS4_VERSION:
+ mnt->flags &= ~NFS_MOUNT_VER3;
+ mnt->version = 4;
break;
+#endif
default:
goto out_invalid_value;
}
@@ -1626,6 +1643,7 @@ static int nfs_validate_mount_data(void *options,
args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
args->auth_flavors[0] = RPC_AUTH_UNIX;
args->auth_flavor_len = 1;
+ args->minorversion = 0;
switch (data->version) {
case 1:
@@ -1724,6 +1742,14 @@ static int nfs_validate_mount_data(void *options,
if (!nfs_verify_server_address(nfs_server_address(args)))
goto out_no_address;
+ if (args->version == 4)
+#ifdef CONFIG_NFS_V4
+ return nfs4_validate_text_mount_data(options,
+ args, dev_name);
+#else
+ goto out_v4_not_compiled;
+#endif
+
nfs_set_default_port(nfs_server_address(args),
args->nfs_server.port, 0);
@@ -1773,6 +1799,12 @@ out_v3_not_compiled:
return -EPROTONOSUPPORT;
#endif /* !CONFIG_NFS_V3 */
+#ifndef CONFIG_NFS_V4
+out_v4_not_compiled:
+ dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
+ return -EPROTONOSUPPORT;
+#endif /* !CONFIG_NFS_V4 */
+
out_nomem:
dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
return -ENOMEM;
@@ -2068,6 +2100,14 @@ static int nfs_get_sb(struct file_system_type *fs_type,
if (error < 0)
goto out;
+#ifdef CONFIG_NFS_V4
+ if (data->version == 4) {
+ error = nfs4_try_mount(flags, dev_name, data, mnt);
+ kfree(data->client_address);
+ goto out;
+ }
+#endif /* CONFIG_NFS_V4 */
+
/* Get a volume representation */
server = nfs_create_server(data, mntfh);
if (IS_ERR(server)) {
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index bd2eba5..33b2836 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -472,6 +472,7 @@ enum lock_type4 {
#define NFSPROC4_NULL 0
#define NFSPROC4_COMPOUND 1
+#define NFS4_VERSION 4
#define NFS4_MINOR_VERSION 0
#if defined(CONFIG_NFS_V4_1)
--
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