3 files changed, 75 insertions, 108 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 0a7068e30ec..08d880fb5b6 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -37,18 +37,58 @@
 #include "v9fs_vfs.h"
 
 /*
+ * Dynamic Transport Registration Routines
+ *
+ */
+
+static LIST_HEAD(v9fs_trans_list);
+static struct p9_trans_module *v9fs_default_trans;
+
+/**
+ * v9fs_register_trans - register a new transport with 9p
+ * @m - structure describing the transport module and entry points
+ *
+ */
+void v9fs_register_trans(struct p9_trans_module *m)
+{
+	list_add_tail(&m->list, &v9fs_trans_list);
+	if (m->def)
+		v9fs_default_trans = m;
+}
+EXPORT_SYMBOL(v9fs_register_trans);
+
+/**
+ * v9fs_match_trans - match transport versus registered transports
+ * @arg: string identifying transport
+ *
+ */
+static struct p9_trans_module *v9fs_match_trans(const substring_t *name)
+{
+	struct list_head *p;
+	struct p9_trans_module *t = NULL;
+
+	list_for_each(p, &v9fs_trans_list) {
+		t = list_entry(p, struct p9_trans_module, list);
+		if (strncmp(t->name, name->from, name->to-name->from) == 0) {
+			P9_DPRINTK(P9_DEBUG_TRANS, "trans=%s\n", t->name);
+			break;
+		}
+	}
+	return t;
+}
+
+/*
   * Option Parsing (code inspired by NFS code)
-  *
+  *  NOTE: each transport will parse its own options
   */
 
 enum {
 	/* Options that take integer arguments */
-	Opt_debug, Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
-	Opt_rfdno, Opt_wfdno,
+	Opt_debug, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
 	/* String options */
-	Opt_uname, Opt_remotename,
+	Opt_uname, Opt_remotename, Opt_trans,
 	/* Options that take no arguments */
-	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
+	Opt_legacy, Opt_nodevmap,
 	/* Cache options */
 	Opt_cache_loose,
 	/* Error token */
@@ -57,24 +97,13 @@ enum {
 
 static match_table_t tokens = {
 	{Opt_debug, "debug=%x"},
-	{Opt_port, "port=%u"},
 	{Opt_msize, "msize=%u"},
 	{Opt_uid, "uid=%u"},
 	{Opt_gid, "gid=%u"},
 	{Opt_afid, "afid=%u"},
-	{Opt_rfdno, "rfdno=%u"},
-	{Opt_wfdno, "wfdno=%u"},
 	{Opt_uname, "uname=%s"},
 	{Opt_remotename, "aname=%s"},
-	{Opt_unix, "proto=unix"},
-	{Opt_tcp, "proto=tcp"},
-	{Opt_fd, "proto=fd"},
-#ifdef CONFIG_PCI_9P
-	{Opt_pci, "proto=pci"},
-#endif
-	{Opt_tcp, "tcp"},
-	{Opt_unix, "unix"},
-	{Opt_fd, "fd"},
+	{Opt_trans, "trans=%s"},
 	{Opt_legacy, "noextend"},
 	{Opt_nodevmap, "nodevmap"},
 	{Opt_cache_loose, "cache=loose"},
@@ -82,12 +111,6 @@ static match_table_t tokens = {
 	{Opt_err, NULL}
 };
 
-extern struct p9_transport *p9pci_trans_create(void);
-
-/*
- *  Parse option string.
- */
-
 /**
  * v9fs_parse_options - parse mount options into session structure
  * @options: options string passed from mount
@@ -95,23 +118,21 @@ extern struct p9_transport *p9pci_trans_create(void);
  *
  */
 
-static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
+static void v9fs_parse_options(struct v9fs_session_info *v9ses)
 {
-	char *p;
+	char *options = v9ses->options;
 	substring_t args[MAX_OPT_ARGS];
+	char *p;
 	int option;
 	int ret;
 
 	/* setup defaults */
-	v9ses->port = V9FS_PORT;
-	v9ses->maxdata = 9000;
-	v9ses->proto = PROTO_TCP;
+	v9ses->maxdata = 8192;
 	v9ses->extended = 1;
 	v9ses->afid = ~0;
 	v9ses->debug = 0;
-	v9ses->rfdno = ~0;
-	v9ses->wfdno = ~0;
 	v9ses->cache = 0;
+	v9ses->trans = v9fs_default_trans;
 
 	if (!options)
 		return;
@@ -135,9 +156,6 @@ static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
 			p9_debug_level = option;
 #endif
 			break;
-		case Opt_port:
-			v9ses->port = option;
-			break;
 		case Opt_msize:
 			v9ses->maxdata = option;
 			break;
@@ -150,23 +168,8 @@ static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
 		case Opt_afid:
 			v9ses->afid = option;
 			break;
-		case Opt_rfdno:
-			v9ses->rfdno = option;
-			break;
-		case Opt_wfdno:
-			v9ses->wfdno = option;
-			break;
-		case Opt_tcp:
-			v9ses->proto = PROTO_TCP;
-			break;
-		case Opt_unix:
-			v9ses->proto = PROTO_UNIX;
-			break;
-		case Opt_pci:
-			v9ses->proto = PROTO_PCI;
-			break;
-		case Opt_fd:
-			v9ses->proto = PROTO_FD;
+		case Opt_trans:
+			v9ses->trans = v9fs_match_trans(&args[0]);
 			break;
 		case Opt_uname:
 			match_strcpy(v9ses->name, &args[0]);
@@ -201,7 +204,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 		  const char *dev_name, char *data)
 {
 	int retval = -EINVAL;
-	struct p9_transport *trans;
+	struct p9_trans *trans = NULL;
 	struct p9_fid *fid;
 
 	v9ses->name = __getname();
@@ -217,39 +220,30 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 	strcpy(v9ses->name, V9FS_DEFUSER);
 	strcpy(v9ses->remotename, V9FS_DEFANAME);
 
-	v9fs_parse_options(data, v9ses);
-
-	switch (v9ses->proto) {
-	case PROTO_TCP:
-		trans = p9_trans_create_tcp(dev_name, v9ses->port);
-		break;
-	case PROTO_UNIX:
-		trans = p9_trans_create_unix(dev_name);
-		*v9ses->remotename = 0;
-		break;
-	case PROTO_FD:
-		trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
-		*v9ses->remotename = 0;
-		break;
-#ifdef CONFIG_PCI_9P
-	case PROTO_PCI:
-		trans = p9pci_trans_create();
-		*v9ses->remotename = 0;
-		break;
-#endif
-	default:
-		printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
-		retval = -ENOPROTOOPT;
+	v9ses->options = kstrdup(data, GFP_KERNEL);
+	v9fs_parse_options(v9ses);
+
+	if ((v9ses->trans == NULL) && !list_empty(&v9fs_trans_list))
+		v9ses->trans = list_first_entry(&v9fs_trans_list,
+		 struct p9_trans_module, list);
+
+	if (v9ses->trans == NULL) {
+		retval = -EPROTONOSUPPORT;
+		P9_DPRINTK(P9_DEBUG_ERROR,
+				"No transport defined or default transport\n");
 		goto error;
-	};
+	}
 
+	trans = v9ses->trans->create(dev_name, v9ses->options);
 	if (IS_ERR(trans)) {
 		retval = PTR_ERR(trans);
 		trans = NULL;
 		goto error;
 	}
+	if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize)
+		v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ;
 
-	v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
+	v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ,
 		v9ses->extended);
 
 	if (IS_ERR(v9ses->clnt)) {
@@ -290,6 +284,7 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
 
 	__putname(v9ses->name);
 	__putname(v9ses->remotename);
+	kfree(v9ses->options);
 }
 
 /**
@@ -311,7 +306,7 @@ extern int v9fs_error_init(void);
 static int __init init_v9fs(void)
 {
 	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
-
+	/* TODO: Setup list of registered trasnport modules */
 	return register_filesystem(&v9fs_fs_type);
 }
 
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index abc4b1668ac..7eb135cf60c 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -31,31 +31,20 @@ struct v9fs_session_info {
 	unsigned int maxdata;
 	unsigned char extended;	/* set to 1 if we are using UNIX extensions */
 	unsigned char nodev;	/* set to 1 if no disable device mapping */
-	unsigned short port;	/* port to connect to */
 	unsigned short debug;	/* debug level */
-	unsigned short proto;	/* protocol to use */
 	unsigned int afid;	/* authentication fid */
-	unsigned int rfdno;	/* read file descriptor number */
-	unsigned int wfdno;	/* write file descriptor number */
 	unsigned int cache;	/* cache mode */
 
+	char *options;		/* copy of mount options */
 	char *name;		/* user name to mount as */
 	char *remotename;	/* name of remote hierarchy being mounted */
 	unsigned int uid;	/* default uid/muid for legacy support */
 	unsigned int gid;	/* default gid for legacy support */
-
+	struct p9_trans_module *trans; /* 9p transport */
 	struct p9_client *clnt;	/* 9p client */
 	struct dentry *debugfs_dir;
 };
 
-/* possible values of ->proto */
-enum {
-	PROTO_TCP,
-	PROTO_UNIX,
-	PROTO_FD,
-	PROTO_PCI,
-};
-
 /* possible values of ->cache */
 /* eventually support loose, tight, time, session, default always none */
 enum {
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index ba904371218..bb0cef9a6b8 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -216,24 +216,7 @@ static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
 {
 	struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
 
-	if (v9ses->debug != 0)
-		seq_printf(m, ",debug=%x", v9ses->debug);
-	if (v9ses->port != V9FS_PORT)
-		seq_printf(m, ",port=%u", v9ses->port);
-	if (v9ses->maxdata != 9000)
-		seq_printf(m, ",msize=%u", v9ses->maxdata);
-	if (v9ses->afid != ~0)
-		seq_printf(m, ",afid=%u", v9ses->afid);
-	if (v9ses->proto == PROTO_UNIX)
-		seq_puts(m, ",proto=unix");
-	if (v9ses->extended == 0)
-		seq_puts(m, ",noextend");
-	if (v9ses->nodev == 1)
-		seq_puts(m, ",nodevmap");
-	seq_printf(m, ",name=%s", v9ses->name);
-	seq_printf(m, ",aname=%s", v9ses->remotename);
-	seq_printf(m, ",uid=%u", v9ses->uid);
-	seq_printf(m, ",gid=%u", v9ses->gid);
+	seq_printf(m, "%s", v9ses->options);
 	return 0;
 }