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net/p9: load default transports 

Now that all transports are split into modules it may happen that no
transports are registered when v9fs_get_default_trans() is called.
When that is the case try to load more transports from modules.

Link: https://lkml.kernel.org/r/20211103193823.111007-5-linux@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
[Dominique: constify v9fs_get_trans_by_name argument as per patch1v2]
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
This commit is contained in:
Thomas Weißschuh 2021-11-03 20:38:23 +01:00 committed by Dominique Martinet
parent 99aa673e29
commit 019641d1b5
2 changed files with 12 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -54,7 +54,7 @@ struct p9_trans_module {
void v9fs_register_trans(struct p9_trans_module *m);
void v9fs_unregister_trans(struct p9_trans_module *m);
struct p9_trans_module *v9fs_get_trans_by_name(char *s);
struct p9_trans_module *v9fs_get_trans_by_name(const char *s);
struct p9_trans_module *v9fs_get_default_trans(void);
void v9fs_put_trans(struct p9_trans_module *m);

13
net/9p/mod.c
View File

@ -83,7 +83,7 @@ void v9fs_unregister_trans(struct p9_trans_module *m)
}
EXPORT_SYMBOL(v9fs_unregister_trans);
static struct p9_trans_module *_p9_get_trans_by_name(char *s)
static struct p9_trans_module *_p9_get_trans_by_name(const char *s)
{
struct p9_trans_module *t, *found = NULL;
@ -106,7 +106,7 @@ static struct p9_trans_module *_p9_get_trans_by_name(char *s)
* @s: string identifying transport
*
*/
struct p9_trans_module *v9fs_get_trans_by_name(char *s)
struct p9_trans_module *v9fs_get_trans_by_name(const char *s)
{
struct p9_trans_module *found = NULL;
@ -123,6 +123,10 @@ struct p9_trans_module *v9fs_get_trans_by_name(char *s)
}
EXPORT_SYMBOL(v9fs_get_trans_by_name);
static const char * const v9fs_default_transports[] = {
"virtio", "tcp", "fd", "unix", "xen", "rdma",
};
/**
* v9fs_get_default_trans - get the default transport
*
@ -131,6 +135,7 @@ EXPORT_SYMBOL(v9fs_get_trans_by_name);
struct p9_trans_module *v9fs_get_default_trans(void)
{
struct p9_trans_module *t, *found = NULL;
int i;
spin_lock(&v9fs_trans_lock);
@ -148,6 +153,10 @@ struct p9_trans_module *v9fs_get_default_trans(void)
}
spin_unlock(&v9fs_trans_lock);
for (i = 0; !found && i < ARRAY_SIZE(v9fs_default_transports); i++)
found = v9fs_get_trans_by_name(v9fs_default_transports[i]);
return found;
}
EXPORT_SYMBOL(v9fs_get_default_trans);