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9p: fix bad kconfig cross-dependency

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This patch moves transport dynamic registration and matching to the net
module to prevent a bad Kconfig dependency between the net and fs 9p modules.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Eric Van Hensbergen 2007-10-17 14:31:07 -05:00 committed by Eric Van Hensbergen
parent 50fd801067
commit fb0466c3ae
5 changed files with 67 additions and 46 deletions
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47
fs/9p/v9fs.c
View File

@ -36,47 +36,6 @@
#include "v9fs.h"
#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
@ -135,7 +94,7 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
v9ses->afid = ~0;
v9ses->debug = 0;
v9ses->cache = 0;
v9ses->trans = v9fs_default_trans;
v9ses->trans = v9fs_default_trans();
if (!options)
return;
@ -245,10 +204,6 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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,

2
include/net/9p/transport.h
View File

@ -50,5 +50,7 @@ struct p9_trans_module {
};
void v9fs_register_trans(struct p9_trans_module *m);
struct p9_trans_module *v9fs_match_trans(const substring_t *name);
struct p9_trans_module *v9fs_default_trans(void);
#endif /* NET_9P_TRANSPORT_H */

1
net/9p/client.c
View File

@ -30,6 +30,7 @@
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <net/9p/transport.h>
#include <net/9p/conn.h>
#include <net/9p/client.h>

62
net/9p/mod.c
View File

@ -27,6 +27,10 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <net/9p/9p.h>
#include <linux/fs.h>
#include <linux/parser.h>
#include <net/9p/transport.h>
#include <linux/list.h>
#ifdef CONFIG_NET_9P_DEBUG
unsigned int p9_debug_level = 0; /* feature-rific global debug level */
@ -40,6 +44,64 @@ extern void p9_mux_global_exit(void);
extern int p9_sysctl_register(void);
extern void p9_sysctl_unregister(void);
/*
* Dynamic Transport Registration Routines
*
*/
static LIST_HEAD(v9fs_trans_list);
static struct p9_trans_module *v9fs_default_transport;
/**
* 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_transport = m;
}
EXPORT_SYMBOL(v9fs_register_trans);
/**
* v9fs_match_trans - match transport versus registered transports
* @arg: string identifying transport
*
*/
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)
break;
}
return t;
}
EXPORT_SYMBOL(v9fs_match_trans);
/**
* v9fs_default_trans - returns pointer to default transport
*
*/
struct p9_trans_module *v9fs_default_trans(void)
{
if (v9fs_default_transport)
return v9fs_default_transport;
else if (!list_empty(&v9fs_trans_list))
return list_first_entry(&v9fs_trans_list,
struct p9_trans_module, list);
else
return NULL;
}
EXPORT_SYMBOL(v9fs_default_trans);
/**
* v9fs_init - Initialize module
*

1
net/9p/mux.c
View File

@ -31,6 +31,7 @@
#include <linux/idr.h>
#include <linux/mutex.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <net/9p/transport.h>
#include <net/9p/conn.h>