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/*
* linux/net/sunrpc/ping.c
*
* Ping routing.
*
* Copyright (C) 2000, Trond Myklebust <trond.myklebust@fys.uio.no>
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/uio.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/sched.h>
#define RPC_SLACK_SPACE 512 /* total overkill */
#define RPC_PING_DELAY (15*HZ)
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_XPRT
#endif
static void ping_call_reserve(struct rpc_task *);
static void ping_call_allocate(struct rpc_task *);
static void ping_call_encode(struct rpc_task *);
static void ping_call_transmit(struct rpc_task *);
static void ping_call_receive(struct rpc_task *);
static void ping_call_exit(struct rpc_task *);
static void
ping_call_reserve(struct rpc_task *task)
{
dprintk("RPC: %4d, ping_call_reserve\n", task->tk_pid);
task->tk_status = 0;
task->tk_action = ping_call_allocate;
task->tk_timeout = task->tk_client->cl_timeout.to_resrvval;
xprt_ping_reserve(task);
}
static void
ping_call_allocate(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_rqst *req = task->tk_rqstp;
unsigned int bufsiz;
dprintk("RPC: %4d, ping_call_allocate (status %d)\n",
task->tk_pid, task->tk_status);
task->tk_action = ping_call_exit;
if (task->tk_status < 0)
return;
bufsiz = rpcproc_bufsiz(clnt, task->tk_msg.rpc_proc) + RPC_SLACK_SPACE;
if (!(task->tk_buffer = rpc_malloc(task, bufsiz << 1))) {
task->tk_status = -ENOMEM;
return;
}
req->rq_svec[0].iov_base = (void *)task->tk_buffer;
req->rq_svec[0].iov_len = bufsiz;
req->rq_slen = 0;
req->rq_snr = 1;
req->rq_rvec[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz);
req->rq_rvec[0].iov_len = bufsiz;
req->rq_rlen = bufsiz;
req->rq_rnr = 1;
task->tk_action = ping_call_encode;
}
static void
ping_call_encode(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
u32 *p;
dprintk("RPC: %4d, ping_call_encode (status %d)\n",
task->tk_pid, task->tk_status);
if (task->tk_status < 0) {
task->tk_action = ping_call_exit;
return;
}
p = rpc_call_header(task);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
task->tk_action = ping_call_transmit;
}
static void
ping_call_transmit(struct rpc_task *task)
{
dprintk("RPC: %4d, ping_call_transmit\n", task->tk_pid);
task->tk_action = ping_call_receive;
xprt_transmit(task);
}
static void
ping_call_receive(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_xprt *xprt = clnt->cl_xprt;
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_timeout *to = &req->rq_timeout;
u32 *p;
dprintk("RPC: %4d, ping_call_receive (status %d)\n",
task->tk_pid, task->tk_status);
if (task->tk_status >= 0)
p = rpc_call_verify(task);
task->tk_action = ping_call_exit;
if (task->tk_status >= 0 || task->tk_status == -EACCES) {
task->tk_status = 0;
if (xprt_norespond(xprt)) {
if (clnt->cl_chatty)
printk(KERN_NOTICE "%s: server %s OK\n",
clnt->cl_protname, clnt->cl_server);
xprt_clear_norespond(xprt);
}
return;
}
switch (task->tk_status) {
case -ENOTCONN:
break;
case -ENOMEM:
case -EAGAIN:
case -ECONNREFUSED:
case -ETIMEDOUT:
if (!xprt_adjust_timeout(to)) {
task->tk_status = 0;
task->tk_action = ping_call_transmit;
break;
}
default:
if (clnt->cl_softrtry) {
task->tk_status = -EIO;
break;
}
if (clnt->cl_chatty) {
if (!xprt_test_and_set_norespond(xprt)) {
printk(KERN_NOTICE
"%s: server %s is not responding\n",
clnt->cl_protname, clnt->cl_server);
} else {
printk(KERN_NOTICE
"%s: server %s still not responding\n",
clnt->cl_protname, clnt->cl_server);
}
}
rpc_delay(task, RPC_PING_DELAY);
}
}
static void
ping_call_exit(struct rpc_task *task)
{
struct rpc_xprt *xprt = task->tk_xprt;
dprintk("RPC: %4d, ping_call_exit (status %d)\n",
task->tk_pid, task->tk_status);
task->tk_action = NULL;
xprt_ping_release(task);
/* Sigh. rpc_delay() clears task->tk_status */
if (task->tk_status == 0 && xprt_norespond(xprt))
task->tk_status = -ETIMEDOUT;
xprt_clear_pinging(xprt);
rpc_wake_up_status(&xprt->pingwait, task->tk_status);
}
void
rpc_ping(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_xprt *xprt = clnt->cl_xprt;
struct rpc_task *child;
struct rpc_message msg = {0, NULL, NULL, NULL};
dprintk("RPC: %4d, rpc_ping\n", task->tk_pid);
again:
if (xprt_test_and_set_pinging(xprt)) {
rpc_sleep_on(&xprt->pingwait, task, NULL, 0);
if (!xprt_pinging(xprt)) {
rpc_wake_up_task(task);
goto again;
}
dprintk("RPC: %4d, rpc_ping, waiting on completion\n",
task->tk_pid);
return;
}
child = rpc_new_child(clnt, task);
if (!child) {
dprintk("RPC: %4d, rpc_ping, failed to create child process\n",
task->tk_pid);
xprt_clear_pinging(xprt);
rpc_wake_up_status(&xprt->pingwait, -ENOMEM);
task->tk_status = -ENOMEM;
return;
}
rpc_call_setup(child, &msg, 0);
child->tk_action = ping_call_reserve;
dprintk("RPC: %4d, rpc_ping, running child process %4d\n",
task->tk_pid, child->tk_pid);
rpc_run_child(task, child, NULL);
}
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