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nfs41: sunrpc: provide functions to create and destroy a svc_xprt for backchannel use

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For nfs41 callbacks we need an svc_xprt to process requests coming up the
backchannel socket as rpc_rqst's that are transformed into svc_rqst's that
need a rq_xprt to be processed.

The svc_{udp,tcp}_create methods are too heavy for this job as svc_create_socket
creates an actual socket to listen on while for nfs41 we're "reusing" the
fore channel's socket.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Benny Halevy 2009-04-01 09:23:09 -04:00
parent a43cde94fe
commit 7652e5a09b
2 changed files with 41 additions and 0 deletions
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2
include/linux/sunrpc/svcsock.h
View File

@ -42,6 +42,8 @@ int svc_sock_names(char *buf, struct svc_serv *serv, char *toclose);
int svc_addsock(struct svc_serv *serv, int fd, char *name_return);
void svc_init_xprt_sock(void);
void svc_cleanup_xprt_sock(void);
struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot);
void svc_sock_destroy(struct svc_xprt *);
/*
* svc_makesock socket characteristics

39
net/sunrpc/svcsock.c
View File

@ -1327,3 +1327,42 @@ static void svc_sock_free(struct svc_xprt *xprt)
sock_release(svsk->sk_sock);
kfree(svsk);
}
/*
* Create a svc_xprt.
*
* For internal use only (e.g. nfsv4.1 backchannel).
* Callers should typically use the xpo_create() method.
*/
struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot)
{
struct svc_sock *svsk;
struct svc_xprt *xprt = NULL;
dprintk("svc: %s\n", __func__);
svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
if (!svsk)
goto out;
xprt = &svsk->sk_xprt;
if (prot == IPPROTO_TCP)
svc_xprt_init(&svc_tcp_class, xprt, serv);
else if (prot == IPPROTO_UDP)
svc_xprt_init(&svc_udp_class, xprt, serv);
else
BUG();
out:
dprintk("svc: %s return %p\n", __func__, xprt);
return xprt;
}
EXPORT_SYMBOL_GPL(svc_sock_create);
/*
* Destroy a svc_sock.
*/
void svc_sock_destroy(struct svc_xprt *xprt)
{
if (xprt)
kfree(container_of(xprt, struct svc_sock, sk_xprt));
}
EXPORT_SYMBOL_GPL(svc_sock_destroy);