cifs: add a smb_version_operations/values structures and a smb_version enum

We need a way to dispatch different operations for different versions.
Behold the smb_version_operations/values structures. For now, those
structures just hold the version enum value and nothing uses them.
Eventually, we'll expand them to cover other operations/values as we
change the callers to dispatch from here.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>

5 files changed, 89 insertions, 2 deletions

diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
index 005d524c3a4a..0fe70258caf0 100644
--- a/fs/cifs/Makefile
+++ b/fs/cifs/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_CIFS) += cifs.o
 cifs-y := cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o inode.o \
           link.o misc.o netmisc.o smbencrypt.o transport.o asn1.o \
           cifs_unicode.o nterr.o xattr.o cifsencrypt.o \
-          readdir.o ioctl.o sess.o export.o
+          readdir.o ioctl.o sess.o export.o smb1ops.o
 
 cifs-$(CONFIG_CIFS_ACL) += cifsacl.o
 
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index f718d5780062..8a6928c4537d 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -354,6 +354,7 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
         struct sockaddr *srcaddr;
         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 
+        seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
         cifs_show_security(s, tcon->ses->server);
         cifs_show_cache_flavor(s, cifs_sb);
 
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index a867d9923d7d..812e22ab0a49 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -150,6 +150,17 @@ struct cifs_cred {
  *****************************************************************
  */
 
+enum smb_version {
+        Smb_1 = 1,
+};
+
+struct smb_version_operations {
+};
+
+struct smb_version_values {
+        char            *version_string;
+};
+
 struct smb_vol {
         char *username;
         char *password;
@@ -205,6 +216,8 @@ struct smb_vol {
         bool sockopt_tcp_nodelay:1;
         unsigned short int port;
         unsigned long actimeo; /* attribute cache timeout (jiffies) */
+        struct smb_version_operations *ops;
+        struct smb_version_values *vals;
         char *prepath;
         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
         struct nls_table *local_nls;
@@ -242,6 +255,8 @@ struct TCP_Server_Info {
         int srv_count; /* reference counter */
         /* 15 character server name + 0x20 16th byte indicating type = srv */
         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
+        struct smb_version_operations   *ops;
+        struct smb_version_values       *vals;
         enum statusEnum tcpStatus; /* what we think the status is */
         char *hostname; /* hostname portion of UNC string */
         struct socket *ssocket;
@@ -1069,4 +1084,8 @@ void cifs_oplock_break(struct work_struct *work);
 extern const struct slow_work_ops cifs_oplock_break_ops;
 extern struct workqueue_struct *cifsiod_wq;
 
+/* Operations for different SMB versions */
+#define SMB1_VERSION_STRING     "1.0"
+extern struct smb_version_operations smb1_operations;
+extern struct smb_version_values smb1_values;
 #endif  /* _CIFS_GLOB_H */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 4a6baa880506..5ac20fc2c312 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -102,7 +102,7 @@ enum {
         Opt_srcaddr, Opt_prefixpath,
         Opt_iocharset, Opt_sockopt,
         Opt_netbiosname, Opt_servern,
-        Opt_ver, Opt_sec, Opt_cache,
+        Opt_ver, Opt_vers, Opt_sec, Opt_cache,
 
         /* Mount options to be ignored */
         Opt_ignore,
@@ -210,6 +210,7 @@ static const match_table_t cifs_mount_option_tokens = {
         { Opt_netbiosname, "netbiosname=%s" },
         { Opt_servern, "servern=%s" },
         { Opt_ver, "ver=%s" },
+        { Opt_vers, "vers=%s" },
         { Opt_sec, "sec=%s" },
         { Opt_cache, "cache=%s" },
 
@@ -275,6 +276,10 @@ static const match_table_t cifs_cacheflavor_tokens = {
         { Opt_cache_err, NULL }
 };
 
+static const match_table_t cifs_smb_version_tokens = {
+        { Smb_1, SMB1_VERSION_STRING },
+};
+
 static int ip_connect(struct TCP_Server_Info *server);
 static int generic_ip_connect(struct TCP_Server_Info *server);
 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
@@ -1225,6 +1230,23 @@ cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
 }
 
 static int
+cifs_parse_smb_version(char *value, struct smb_vol *vol)
+{
+        substring_t args[MAX_OPT_ARGS];
+
+        switch (match_token(value, cifs_smb_version_tokens, args)) {
+        case Smb_1:
+                vol->ops = &smb1_operations;
+                vol->vals = &smb1_values;
+                break;
+        default:
+                cERROR(1, "Unknown vers= option specified: %s", value);
+                return 1;
+        }
+        return 0;
+}
+
+static int
 cifs_parse_mount_options(const char *mountdata, const char *devname,
                          struct smb_vol *vol)
 {
@@ -1277,6 +1299,10 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
 
         vol->actimeo = CIFS_DEF_ACTIMEO;
 
+        /* FIXME: add autonegotiation -- for now, SMB1 is default */
+        vol->ops = &smb1_operations;
+        vol->vals = &smb1_values;
+
         if (!mountdata)
                 goto cifs_parse_mount_err;
 
@@ -1880,6 +1906,14 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
                         printk(KERN_WARNING "CIFS: Invalid version"
                                             " specified\n");
                         goto cifs_parse_mount_err;
+                case Opt_vers:
+                        string = match_strdup(args);
+                        if (string == NULL)
+                                goto out_nomem;
+
+                        if (cifs_parse_smb_version(string, vol) != 0)
+                                goto cifs_parse_mount_err;
+                        break;
                 case Opt_sec:
                         string = match_strdup(args);
                         if (string == NULL)
@@ -2108,6 +2142,9 @@ match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
                          struct smb_vol *vol)
 {
+        if ((server->vals != vol->vals) || (server->ops != vol->ops))
+                return 0;
+
         if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
                 return 0;
 
@@ -2230,6 +2267,8 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
                 goto out_err;
         }
 
+        tcp_ses->ops = volume_info->ops;
+        tcp_ses->vals = volume_info->vals;
         cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
         tcp_ses->hostname = extract_hostname(volume_info->UNC);
         if (IS_ERR(tcp_ses->hostname)) {
@@ -3636,6 +3675,7 @@ cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
         if (cifs_parse_mount_options(mount_data, devname, volume_info))
                 return -EINVAL;
 
+
         if (volume_info->nullauth) {
                 cFYI(1, "Anonymous login");
                 kfree(volume_info->username);
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
new file mode 100644
index 000000000000..d2850d194eb5
--- /dev/null
+++ b/fs/cifs/smb1ops.c
@@ -0,0 +1,27 @@
+/*
+ *  SMB1 (CIFS) version specific operations
+ *
+ *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
+ *
+ *  This library is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License v2 as published
+ *  by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *  the GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "cifsglob.h"
+
+struct smb_version_operations smb1_operations = {
+};
+
+struct smb_version_values smb1_values = {
+        .version_string = SMB1_VERSION_STRING,
+};