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[PATCH] RPC: client-side transport switch cleanup 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
include/linux/sunrpc/xprt.h
View File

@ -1,5 +1,5 @@
/*
* linux/include/linux/sunrpc/clnt_xprt.h
* linux/include/linux/sunrpc/xprt.h
*
* Declarations for the RPC transport interface.
*
@ -150,8 +150,8 @@ struct rpc_xprt {
unsigned long cong; /* current congestion */
unsigned long cwnd; /* congestion window */
unsigned int rcvsize, /* socket receive buffer size */
sndsize; /* socket send buffer size */
unsigned int rcvsize, /* transport rcv buffer size */
sndsize; /* transport send buffer size */
size_t max_payload; /* largest RPC payload size,
in bytes */
@ -184,12 +184,12 @@ struct rpc_xprt {
unsigned long tcp_copied, /* copied to request */
tcp_flags;
/*
* Connection of sockets
* Connection of transports
*/
struct work_struct sock_connect;
struct work_struct connect_worker;
unsigned short port;
/*
* Disconnection of idle sockets
* Disconnection of idle transports
*/
struct work_struct task_cleanup;
struct timer_list timer;
@ -219,27 +219,36 @@ struct rpc_xprt {
#ifdef __KERNEL__
struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr,
struct rpc_timeout *toparms);
void xprt_disconnect(struct rpc_xprt *);
int xprt_destroy(struct rpc_xprt *);
void xprt_set_timeout(struct rpc_timeout *, unsigned int,
unsigned long);
struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *, u32);
void xprt_complete_rqst(struct rpc_xprt *,
struct rpc_rqst *, int);
void xprt_reserve(struct rpc_task *);
int xprt_prepare_transmit(struct rpc_task *);
void xprt_transmit(struct rpc_task *);
void xprt_receive(struct rpc_task *);
void xprt_wake_pending_tasks(struct rpc_xprt *, int);
/*
* Transport operations used by ULPs
*/
struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr, struct rpc_timeout *to);
void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr);
/*
* Generic internal transport functions
*/
void xprt_connect(struct rpc_task *task);
void xprt_reserve(struct rpc_task *task);
int xprt_prepare_transmit(struct rpc_task *task);
void xprt_transmit(struct rpc_task *task);
int xprt_adjust_timeout(struct rpc_rqst *req);
void xprt_release(struct rpc_task *);
void xprt_connect(struct rpc_task *);
int xs_setup_udp(struct rpc_xprt *,
struct rpc_timeout *);
int xs_setup_tcp(struct rpc_xprt *,
struct rpc_timeout *);
void xprt_release(struct rpc_task *task);
int xprt_destroy(struct rpc_xprt *xprt);
/*
* Transport switch helper functions
*/
void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid);
void xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied);
void xprt_disconnect(struct rpc_xprt *xprt);
/*
* Socket transport setup operations
*/
int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to);
int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to);
/*
* Reserved bit positions in xprt->state

2
net/sunrpc/clnt.c
View File

@ -1,5 +1,5 @@
/*
* linux/net/sunrpc/rpcclnt.c
* linux/net/sunrpc/clnt.c
*
* This file contains the high-level RPC interface.
* It is modeled as a finite state machine to support both synchronous

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;

12
net/sunrpc/xprtsock.c
View File

@ -11,6 +11,8 @@
* Rewrite of larges part of the code in order to stabilize TCP stuff.
* Fix behaviour when socket buffer is full.
* (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
*
* IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
*/
#include <linux/types.h>
@ -363,7 +365,7 @@ static void xs_destroy(struct rpc_xprt *xprt)
{
dprintk("RPC: xs_destroy xprt %p\n", xprt);
cancel_delayed_work(&xprt->sock_connect);
cancel_delayed_work(&xprt->connect_worker);
flush_scheduled_work();
xprt_disconnect(xprt);
@ -938,11 +940,11 @@ static void xs_connect(struct rpc_task *task)
if (!xprt_test_and_set_connecting(xprt)) {
if (xprt->sock != NULL) {
dprintk("RPC: xs_connect delayed xprt %p\n", xprt);
schedule_delayed_work(&xprt->sock_connect,
schedule_delayed_work(&xprt->connect_worker,
RPC_REESTABLISH_TIMEOUT);
} else {
dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
schedule_work(&xprt->sock_connect);
schedule_work(&xprt->connect_worker);
/* flush_scheduled_work can sleep... */
if (!RPC_IS_ASYNC(task))
flush_scheduled_work();
@ -989,7 +991,7 @@ int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
/* XXX: header size can vary due to auth type, IPv6, etc. */
xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
INIT_WORK(&xprt->sock_connect, xs_connect_worker, xprt);
INIT_WORK(&xprt->connect_worker, xs_connect_worker, xprt);
xprt->ops = &xs_ops;
@ -1028,7 +1030,7 @@ int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
xprt->max_payload = (1U << 31) - 1;
INIT_WORK(&xprt->sock_connect, xs_connect_worker, xprt);
INIT_WORK(&xprt->connect_worker, xs_connect_worker, xprt);
xprt->ops = &xs_ops;