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[PATCH] RPC: client-side transport switch cleanup

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Clean-up: change some comments to reflect the realities of the new RPC
 transport switch mechanism.  Get rid of unused xprt_receive() prototype.

 Also, organize function prototypes in xprt.h by usage and scope.

 Test-plan:
 Compile kernel with CONFIG_NFS enabled.

 Version: Thu, 11 Aug 2005 16:07:21 -0400

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
2005-08-11 16:25:47 -04:00
committed by Trond Myklebust
parent 44fbac2288
commit 55aa4f58aa
4 changed files with 55 additions and 46 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
net/sunrpc/xprt.c
View File

@@ -10,12 +10,12 @@
* one is available. Otherwise, it sleeps on the backlog queue
* (xprt_reserve).
* - Next, the caller puts together the RPC message, stuffs it into
* the request struct, and calls xprt_call().
* - xprt_call transmits the message and installs the caller on the
* socket's wait list. At the same time, it installs a timer that
* the request struct, and calls xprt_transmit().
* - xprt_transmit sends the message and installs the caller on the
* transport's wait list. At the same time, it installs a timer that
* is run after the packet's timeout has expired.
* - When a packet arrives, the data_ready handler walks the list of
* pending requests for that socket. If a matching XID is found, the
* pending requests for that transport. If a matching XID is found, the
* caller is woken up, and the timer removed.
* - When no reply arrives within the timeout interval, the timer is
* fired by the kernel and runs xprt_timer(). It either adjusts the
@@ -32,6 +32,8 @@
* tasks that rely on callbacks.
*
* Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de>
*
* Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com>
*/
#include <linux/module.h>
@@ -52,8 +54,6 @@
# define RPCDBG_FACILITY RPCDBG_XPRT
#endif
#define XPRT_MAX_BACKOFF (8)
/*
* Local functions
*/
@@ -65,9 +65,9 @@ static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
static int xprt_clear_backlog(struct rpc_xprt *xprt);
/*
* Serialize write access to sockets, in order to prevent different
* Serialize write access to transports, in order to prevent different
* requests from interfering with each other.
* Also prevents TCP socket connects from colliding with writes.
* Also prevents transport connects from colliding with writes.
*/
static int
__xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
@@ -91,7 +91,7 @@ __xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
clear_bit(XPRT_LOCKED, &xprt->state);
smp_mb__after_clear_bit();
out_sleep:
dprintk("RPC: %4d failed to lock socket %p\n", task->tk_pid, xprt);
dprintk("RPC: %4d failed to lock transport %p\n", task->tk_pid, xprt);
task->tk_timeout = 0;
task->tk_status = -EAGAIN;
if (req && req->rq_ntrans)
@@ -144,7 +144,7 @@ out_unlock:
}
/*
* Releases the socket for use by other requests.
* Releases the transport for use by other requests.
*/
static void
__xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task)
@@ -294,8 +294,7 @@ int xprt_adjust_timeout(struct rpc_rqst *req)
return status;
}
static void
xprt_socket_autoclose(void *args)
static void xprt_autoclose(void *args)
{
struct rpc_xprt *xprt = (struct rpc_xprt *)args;
@@ -329,7 +328,6 @@ xprt_init_autodisconnect(unsigned long data)
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
goto out_abort;
spin_unlock(&xprt->transport_lock);
/* Let keventd close the socket */
if (xprt_connecting(xprt))
xprt_release_write(xprt, NULL);
else
@@ -770,7 +768,7 @@ static struct rpc_xprt *xprt_setup(int proto, struct sockaddr_in *ap, struct rpc
INIT_LIST_HEAD(&xprt->free);
INIT_LIST_HEAD(&xprt->recv);
INIT_WORK(&xprt->task_cleanup, xprt_socket_autoclose, xprt);
INIT_WORK(&xprt->task_cleanup, xprt_autoclose, xprt);
init_timer(&xprt->timer);
xprt->timer.function = xprt_init_autodisconnect;
xprt->timer.data = (unsigned long) xprt;