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SUNRPC: Convert struct rpc_xprt to use atomic_t counters 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2011-03-15 19:56:30 -04:00
parent e020c6800c
commit a8de240a90
2 changed files with 9 additions and 10 deletions
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3
include/linux/sunrpc/xprt.h
View File

@ -12,7 +12,6 @@
#include <linux/uio.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kref.h>
#include <linux/ktime.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/xdr.h>
@ -146,7 +145,7 @@ enum xprt_transports {
};
struct rpc_xprt {
struct kref kref; /* Reference count */
atomic_t count; /* Reference count */
struct rpc_xprt_ops * ops; /* transport methods */
const struct rpc_timeout *timeout; /* timeout parms */

16
net/sunrpc/xprt.c
View File

@ -964,7 +964,7 @@ struct rpc_xprt *xprt_alloc(struct net *net, int size, int max_req)
xprt = kzalloc(size, GFP_KERNEL);
if (xprt == NULL)
goto out;
kref_init(&xprt->kref);
atomic_set(&xprt->count, 1);
xprt->max_reqs = max_req;
xprt->slot = kcalloc(max_req, sizeof(struct rpc_rqst), GFP_KERNEL);
@ -1144,13 +1144,11 @@ found:
/**
* xprt_destroy - destroy an RPC transport, killing off all requests.
* @kref: kref for the transport to destroy
* @xprt: transport to destroy
*
*/
static void xprt_destroy(struct kref *kref)
static void xprt_destroy(struct rpc_xprt *xprt)
{
struct rpc_xprt *xprt = container_of(kref, struct rpc_xprt, kref);
dprintk("RPC: destroying transport %p\n", xprt);
xprt->shutdown = 1;
del_timer_sync(&xprt->timer);
@ -1174,7 +1172,8 @@ static void xprt_destroy(struct kref *kref)
*/
void xprt_put(struct rpc_xprt *xprt)
{
kref_put(&xprt->kref, xprt_destroy);
if (atomic_dec_and_test(&xprt->count))
xprt_destroy(xprt);
}
/**
@ -1184,6 +1183,7 @@ void xprt_put(struct rpc_xprt *xprt)
*/
struct rpc_xprt *xprt_get(struct rpc_xprt *xprt)
{
kref_get(&xprt->kref);
return xprt;
if (atomic_inc_not_zero(&xprt->count))
return xprt;
return NULL;
}