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NFS/SUNRPC: support transport protocol naming 

To prepare for including non-sockets-based RPC transports, select
RPC transports by an identifier (to be used in following patches).

Signed-off-by: Tom Talpey <tmt@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
\"Talpey, Thomas\ 2007-09-10 13:47:57 -04:00 committed by Trond Myklebust
parent 49c36fcc44
commit 4fa016eb24
5 changed files with 19 additions and 13 deletions
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5
include/linux/sunrpc/xprt.h
View File

@ -187,7 +187,7 @@ struct rpc_xprt {
};
struct xprt_create {
int proto; /* IPPROTO_UDP or IPPROTO_TCP */
int ident; /* XPRT_TRANSPORT identifier */
struct sockaddr * srcaddr; /* optional local address */
struct sockaddr * dstaddr; /* remote peer address */
size_t addrlen;
@ -196,8 +196,7 @@ struct xprt_create {
struct xprt_class {
struct list_head list;
unsigned short family;
int protocol;
int ident; /* XPRT_TRANSPORT identifier */
struct rpc_xprt * (*setup)(struct xprt_create *);
struct module *owner;
char name[32];

11
include/linux/sunrpc/xprtsock.h
View File

@ -18,6 +18,17 @@ struct rpc_xprt *xs_setup_tcp(struct xprt_create *args);
int init_socket_xprt(void);
void cleanup_socket_xprt(void);
/*
* RPC transport identifiers for UDP, TCP
*
* To preserve compatibility with the historical use of raw IP protocol
* id's for transport selection, these are specified with the previous
* values. No such restriction exists for new transports, except that
* they may not collide with these values (17 and 6, respectively).
*/
#define XPRT_TRANSPORT_UDP IPPROTO_UDP
#define XPRT_TRANSPORT_TCP IPPROTO_TCP
/*
* RPC slot table sizes for UDP, TCP transports
*/

2
net/sunrpc/clnt.c
View File

@ -241,7 +241,7 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
struct rpc_xprt *xprt;
struct rpc_clnt *clnt;
struct xprt_create xprtargs = {
.proto = args->protocol,
.ident = args->protocol,
.srcaddr = args->saddress,
.dstaddr = args->address,
.addrlen = args->addrsize,

8
net/sunrpc/xprt.c
View File

@ -104,7 +104,7 @@ int xprt_register_transport(struct xprt_class *transport)
spin_lock(&xprt_list_lock);
list_for_each_entry(t, &xprt_list, list) {
/* don't register the same transport class twice */
if (t == transport)
if (t->ident == transport->ident)
goto out;
}
@ -987,15 +987,13 @@ struct rpc_xprt *xprt_create_transport(struct xprt_create *args)
spin_lock(&xprt_list_lock);
list_for_each_entry(t, &xprt_list, list) {
if ((t->family == args->dstaddr->sa_family) &&
(t->protocol == args->proto)) {
if (t->ident == args->ident) {
spin_unlock(&xprt_list_lock);
goto found;
}
}
spin_unlock(&xprt_list_lock);
printk(KERN_ERR "RPC: transport (%u/%d) not supported\n",
args->dstaddr->sa_family, args->proto);
printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident);
return ERR_PTR(-EIO);
found:

6
net/sunrpc/xprtsock.c
View File

@ -1955,8 +1955,7 @@ static struct xprt_class xs_udp_transport = {
.list = LIST_HEAD_INIT(xs_udp_transport.list),
.name = "udp",
.owner = THIS_MODULE,
.family = AF_INET,
.protocol = IPPROTO_UDP,
.ident = IPPROTO_UDP,
.setup = xs_setup_udp,
};
@ -1964,8 +1963,7 @@ static struct xprt_class xs_tcp_transport = {
.list = LIST_HEAD_INIT(xs_tcp_transport.list),
.name = "tcp",
.owner = THIS_MODULE,
.family = AF_INET,
.protocol = IPPROTO_TCP,
.ident = IPPROTO_TCP,
.setup = xs_setup_tcp,
};