ded0f38e61
are used by NFSv4.1 for callbacks. A backchannel is a connection established by the client, but used for RPCs done by the server on the client (callbacks). As a result, this patch mixes some client side calls in the server side and vice versa. Some definitions in the .c files were extracted out into a file called krpc.h, so that they could be included in multiple .c files. This code has been in projects/nfsv4.1-client for some time. Although no one has given it a formal review, I believe kib@ has taken a look at it.
509 lines
12 KiB
C
509 lines
12 KiB
C
/*-
|
|
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
|
|
* Authors: Doug Rabson <dfr@rabson.org>
|
|
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/pcpu.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/time.h>
|
|
#include <sys/uio.h>
|
|
|
|
#include <rpc/rpc.h>
|
|
#include <rpc/rpc_com.h>
|
|
#include <rpc/krpc.h>
|
|
|
|
static enum clnt_stat clnt_reconnect_call(CLIENT *, struct rpc_callextra *,
|
|
rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
|
|
static void clnt_reconnect_geterr(CLIENT *, struct rpc_err *);
|
|
static bool_t clnt_reconnect_freeres(CLIENT *, xdrproc_t, void *);
|
|
static void clnt_reconnect_abort(CLIENT *);
|
|
static bool_t clnt_reconnect_control(CLIENT *, u_int, void *);
|
|
static void clnt_reconnect_close(CLIENT *);
|
|
static void clnt_reconnect_destroy(CLIENT *);
|
|
|
|
static struct clnt_ops clnt_reconnect_ops = {
|
|
.cl_call = clnt_reconnect_call,
|
|
.cl_abort = clnt_reconnect_abort,
|
|
.cl_geterr = clnt_reconnect_geterr,
|
|
.cl_freeres = clnt_reconnect_freeres,
|
|
.cl_close = clnt_reconnect_close,
|
|
.cl_destroy = clnt_reconnect_destroy,
|
|
.cl_control = clnt_reconnect_control
|
|
};
|
|
|
|
static int fake_wchan;
|
|
|
|
CLIENT *
|
|
clnt_reconnect_create(
|
|
struct netconfig *nconf, /* network type */
|
|
struct sockaddr *svcaddr, /* servers address */
|
|
rpcprog_t program, /* program number */
|
|
rpcvers_t version, /* version number */
|
|
size_t sendsz, /* buffer recv size */
|
|
size_t recvsz) /* buffer send size */
|
|
{
|
|
CLIENT *cl = NULL; /* client handle */
|
|
struct rc_data *rc = NULL; /* private data */
|
|
|
|
if (svcaddr == NULL) {
|
|
rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
|
|
return (NULL);
|
|
}
|
|
|
|
cl = mem_alloc(sizeof (CLIENT));
|
|
rc = mem_alloc(sizeof (*rc));
|
|
mtx_init(&rc->rc_lock, "rc->rc_lock", NULL, MTX_DEF);
|
|
(void) memcpy(&rc->rc_addr, svcaddr, (size_t)svcaddr->sa_len);
|
|
rc->rc_nconf = nconf;
|
|
rc->rc_prog = program;
|
|
rc->rc_vers = version;
|
|
rc->rc_sendsz = sendsz;
|
|
rc->rc_recvsz = recvsz;
|
|
rc->rc_timeout.tv_sec = -1;
|
|
rc->rc_timeout.tv_usec = -1;
|
|
rc->rc_retry.tv_sec = 3;
|
|
rc->rc_retry.tv_usec = 0;
|
|
rc->rc_retries = INT_MAX;
|
|
rc->rc_privport = FALSE;
|
|
rc->rc_waitchan = "rpcrecv";
|
|
rc->rc_intr = 0;
|
|
rc->rc_connecting = FALSE;
|
|
rc->rc_closed = FALSE;
|
|
rc->rc_ucred = crdup(curthread->td_ucred);
|
|
rc->rc_client = NULL;
|
|
|
|
cl->cl_refs = 1;
|
|
cl->cl_ops = &clnt_reconnect_ops;
|
|
cl->cl_private = (caddr_t)(void *)rc;
|
|
cl->cl_auth = authnone_create();
|
|
cl->cl_tp = NULL;
|
|
cl->cl_netid = NULL;
|
|
return (cl);
|
|
}
|
|
|
|
static enum clnt_stat
|
|
clnt_reconnect_connect(CLIENT *cl)
|
|
{
|
|
struct thread *td = curthread;
|
|
struct rc_data *rc = (struct rc_data *)cl->cl_private;
|
|
struct socket *so;
|
|
enum clnt_stat stat;
|
|
int error;
|
|
int one = 1;
|
|
struct ucred *oldcred;
|
|
CLIENT *newclient = NULL;
|
|
|
|
mtx_lock(&rc->rc_lock);
|
|
while (rc->rc_connecting) {
|
|
error = msleep(rc, &rc->rc_lock,
|
|
rc->rc_intr ? PCATCH : 0, "rpcrecon", 0);
|
|
if (error) {
|
|
mtx_unlock(&rc->rc_lock);
|
|
return (RPC_INTR);
|
|
}
|
|
}
|
|
if (rc->rc_closed) {
|
|
mtx_unlock(&rc->rc_lock);
|
|
return (RPC_CANTSEND);
|
|
}
|
|
if (rc->rc_client) {
|
|
mtx_unlock(&rc->rc_lock);
|
|
return (RPC_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* My turn to attempt a connect. The rc_connecting variable
|
|
* serializes the following code sequence, so it is guaranteed
|
|
* that rc_client will still be NULL after it is re-locked below,
|
|
* since that is the only place it is set non-NULL.
|
|
*/
|
|
rc->rc_connecting = TRUE;
|
|
mtx_unlock(&rc->rc_lock);
|
|
|
|
oldcred = td->td_ucred;
|
|
td->td_ucred = rc->rc_ucred;
|
|
so = __rpc_nconf2socket(rc->rc_nconf);
|
|
if (!so) {
|
|
stat = rpc_createerr.cf_stat = RPC_TLIERROR;
|
|
rpc_createerr.cf_error.re_errno = 0;
|
|
td->td_ucred = oldcred;
|
|
goto out;
|
|
}
|
|
|
|
if (rc->rc_privport)
|
|
bindresvport(so, NULL);
|
|
|
|
if (rc->rc_nconf->nc_semantics == NC_TPI_CLTS)
|
|
newclient = clnt_dg_create(so,
|
|
(struct sockaddr *) &rc->rc_addr, rc->rc_prog, rc->rc_vers,
|
|
rc->rc_sendsz, rc->rc_recvsz);
|
|
else
|
|
newclient = clnt_vc_create(so,
|
|
(struct sockaddr *) &rc->rc_addr, rc->rc_prog, rc->rc_vers,
|
|
rc->rc_sendsz, rc->rc_recvsz, rc->rc_intr);
|
|
td->td_ucred = oldcred;
|
|
|
|
if (!newclient) {
|
|
soclose(so);
|
|
rc->rc_err = rpc_createerr.cf_error;
|
|
stat = rpc_createerr.cf_stat;
|
|
goto out;
|
|
}
|
|
|
|
CLNT_CONTROL(newclient, CLSET_FD_CLOSE, 0);
|
|
CLNT_CONTROL(newclient, CLSET_CONNECT, &one);
|
|
CLNT_CONTROL(newclient, CLSET_TIMEOUT, &rc->rc_timeout);
|
|
CLNT_CONTROL(newclient, CLSET_RETRY_TIMEOUT, &rc->rc_retry);
|
|
CLNT_CONTROL(newclient, CLSET_WAITCHAN, rc->rc_waitchan);
|
|
CLNT_CONTROL(newclient, CLSET_INTERRUPTIBLE, &rc->rc_intr);
|
|
if (rc->rc_backchannel != NULL)
|
|
CLNT_CONTROL(newclient, CLSET_BACKCHANNEL, rc->rc_backchannel);
|
|
stat = RPC_SUCCESS;
|
|
|
|
out:
|
|
mtx_lock(&rc->rc_lock);
|
|
KASSERT(rc->rc_client == NULL, ("rc_client not null"));
|
|
if (!rc->rc_closed) {
|
|
rc->rc_client = newclient;
|
|
newclient = NULL;
|
|
}
|
|
rc->rc_connecting = FALSE;
|
|
wakeup(rc);
|
|
mtx_unlock(&rc->rc_lock);
|
|
|
|
if (newclient) {
|
|
/*
|
|
* It has been closed, so discard the new client.
|
|
* nb: clnt_[dg|vc]_close()/clnt_[dg|vc]_destroy() cannot
|
|
* be called with the rc_lock mutex held, since they may
|
|
* msleep() while holding a different mutex.
|
|
*/
|
|
CLNT_CLOSE(newclient);
|
|
CLNT_RELEASE(newclient);
|
|
}
|
|
|
|
return (stat);
|
|
}
|
|
|
|
static enum clnt_stat
|
|
clnt_reconnect_call(
|
|
CLIENT *cl, /* client handle */
|
|
struct rpc_callextra *ext, /* call metadata */
|
|
rpcproc_t proc, /* procedure number */
|
|
struct mbuf *args, /* pointer to args */
|
|
struct mbuf **resultsp, /* pointer to results */
|
|
struct timeval utimeout)
|
|
{
|
|
struct rc_data *rc = (struct rc_data *)cl->cl_private;
|
|
CLIENT *client;
|
|
enum clnt_stat stat;
|
|
int tries, error;
|
|
|
|
tries = 0;
|
|
do {
|
|
mtx_lock(&rc->rc_lock);
|
|
if (rc->rc_closed) {
|
|
mtx_unlock(&rc->rc_lock);
|
|
return (RPC_CANTSEND);
|
|
}
|
|
|
|
if (!rc->rc_client) {
|
|
mtx_unlock(&rc->rc_lock);
|
|
stat = clnt_reconnect_connect(cl);
|
|
if (stat == RPC_SYSTEMERROR) {
|
|
error = tsleep(&fake_wchan,
|
|
rc->rc_intr ? PCATCH | PBDRY : 0, "rpccon",
|
|
hz);
|
|
if (error == EINTR || error == ERESTART)
|
|
return (RPC_INTR);
|
|
tries++;
|
|
if (tries >= rc->rc_retries)
|
|
return (stat);
|
|
continue;
|
|
}
|
|
if (stat != RPC_SUCCESS)
|
|
return (stat);
|
|
mtx_lock(&rc->rc_lock);
|
|
}
|
|
|
|
if (!rc->rc_client) {
|
|
mtx_unlock(&rc->rc_lock);
|
|
stat = RPC_FAILED;
|
|
continue;
|
|
}
|
|
CLNT_ACQUIRE(rc->rc_client);
|
|
client = rc->rc_client;
|
|
mtx_unlock(&rc->rc_lock);
|
|
stat = CLNT_CALL_MBUF(client, ext, proc, args,
|
|
resultsp, utimeout);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
if (!ext)
|
|
CLNT_GETERR(client, &rc->rc_err);
|
|
}
|
|
|
|
if (stat == RPC_TIMEDOUT) {
|
|
/*
|
|
* Check for async send misfeature for NLM
|
|
* protocol.
|
|
*/
|
|
if ((rc->rc_timeout.tv_sec == 0
|
|
&& rc->rc_timeout.tv_usec == 0)
|
|
|| (rc->rc_timeout.tv_sec == -1
|
|
&& utimeout.tv_sec == 0
|
|
&& utimeout.tv_usec == 0)) {
|
|
CLNT_RELEASE(client);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (stat == RPC_TIMEDOUT || stat == RPC_CANTSEND
|
|
|| stat == RPC_CANTRECV) {
|
|
tries++;
|
|
if (tries >= rc->rc_retries) {
|
|
CLNT_RELEASE(client);
|
|
break;
|
|
}
|
|
|
|
if (ext && ext->rc_feedback)
|
|
ext->rc_feedback(FEEDBACK_RECONNECT, proc,
|
|
ext->rc_feedback_arg);
|
|
|
|
mtx_lock(&rc->rc_lock);
|
|
/*
|
|
* Make sure that someone else hasn't already
|
|
* reconnected by checking if rc_client has changed.
|
|
* If not, we are done with the client and must
|
|
* do CLNT_RELEASE(client) twice to dispose of it,
|
|
* because there is both an initial refcnt and one
|
|
* acquired by CLNT_ACQUIRE() above.
|
|
*/
|
|
if (rc->rc_client == client) {
|
|
rc->rc_client = NULL;
|
|
mtx_unlock(&rc->rc_lock);
|
|
CLNT_RELEASE(client);
|
|
} else {
|
|
mtx_unlock(&rc->rc_lock);
|
|
}
|
|
CLNT_RELEASE(client);
|
|
} else {
|
|
CLNT_RELEASE(client);
|
|
break;
|
|
}
|
|
} while (stat != RPC_SUCCESS);
|
|
|
|
KASSERT(stat != RPC_SUCCESS || *resultsp,
|
|
("RPC_SUCCESS without reply"));
|
|
|
|
return (stat);
|
|
}
|
|
|
|
static void
|
|
clnt_reconnect_geterr(CLIENT *cl, struct rpc_err *errp)
|
|
{
|
|
struct rc_data *rc = (struct rc_data *)cl->cl_private;
|
|
|
|
*errp = rc->rc_err;
|
|
}
|
|
|
|
/*
|
|
* Since this function requires that rc_client be valid, it can
|
|
* only be called when that is guaranteed to be the case.
|
|
*/
|
|
static bool_t
|
|
clnt_reconnect_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
|
|
{
|
|
struct rc_data *rc = (struct rc_data *)cl->cl_private;
|
|
|
|
return (CLNT_FREERES(rc->rc_client, xdr_res, res_ptr));
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static void
|
|
clnt_reconnect_abort(CLIENT *h)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* CLNT_CONTROL() on the client returned by clnt_reconnect_create() must
|
|
* always be called before CLNT_CALL_MBUF() by a single thread only.
|
|
*/
|
|
static bool_t
|
|
clnt_reconnect_control(CLIENT *cl, u_int request, void *info)
|
|
{
|
|
struct rc_data *rc = (struct rc_data *)cl->cl_private;
|
|
SVCXPRT *xprt;
|
|
|
|
if (info == NULL) {
|
|
return (FALSE);
|
|
}
|
|
switch (request) {
|
|
case CLSET_TIMEOUT:
|
|
rc->rc_timeout = *(struct timeval *)info;
|
|
if (rc->rc_client)
|
|
CLNT_CONTROL(rc->rc_client, request, info);
|
|
break;
|
|
|
|
case CLGET_TIMEOUT:
|
|
*(struct timeval *)info = rc->rc_timeout;
|
|
break;
|
|
|
|
case CLSET_RETRY_TIMEOUT:
|
|
rc->rc_retry = *(struct timeval *)info;
|
|
if (rc->rc_client)
|
|
CLNT_CONTROL(rc->rc_client, request, info);
|
|
break;
|
|
|
|
case CLGET_RETRY_TIMEOUT:
|
|
*(struct timeval *)info = rc->rc_retry;
|
|
break;
|
|
|
|
case CLGET_VERS:
|
|
*(uint32_t *)info = rc->rc_vers;
|
|
break;
|
|
|
|
case CLSET_VERS:
|
|
rc->rc_vers = *(uint32_t *) info;
|
|
if (rc->rc_client)
|
|
CLNT_CONTROL(rc->rc_client, CLSET_VERS, info);
|
|
break;
|
|
|
|
case CLGET_PROG:
|
|
*(uint32_t *)info = rc->rc_prog;
|
|
break;
|
|
|
|
case CLSET_PROG:
|
|
rc->rc_prog = *(uint32_t *) info;
|
|
if (rc->rc_client)
|
|
CLNT_CONTROL(rc->rc_client, request, info);
|
|
break;
|
|
|
|
case CLSET_WAITCHAN:
|
|
rc->rc_waitchan = (char *)info;
|
|
if (rc->rc_client)
|
|
CLNT_CONTROL(rc->rc_client, request, info);
|
|
break;
|
|
|
|
case CLGET_WAITCHAN:
|
|
*(const char **) info = rc->rc_waitchan;
|
|
break;
|
|
|
|
case CLSET_INTERRUPTIBLE:
|
|
rc->rc_intr = *(int *) info;
|
|
if (rc->rc_client)
|
|
CLNT_CONTROL(rc->rc_client, request, info);
|
|
break;
|
|
|
|
case CLGET_INTERRUPTIBLE:
|
|
*(int *) info = rc->rc_intr;
|
|
break;
|
|
|
|
case CLSET_RETRIES:
|
|
rc->rc_retries = *(int *) info;
|
|
break;
|
|
|
|
case CLGET_RETRIES:
|
|
*(int *) info = rc->rc_retries;
|
|
break;
|
|
|
|
case CLSET_PRIVPORT:
|
|
rc->rc_privport = *(int *) info;
|
|
break;
|
|
|
|
case CLGET_PRIVPORT:
|
|
*(int *) info = rc->rc_privport;
|
|
break;
|
|
|
|
case CLSET_BACKCHANNEL:
|
|
xprt = (SVCXPRT *)info;
|
|
SVC_ACQUIRE(xprt);
|
|
xprt_register(xprt);
|
|
rc->rc_backchannel = info;
|
|
break;
|
|
|
|
default:
|
|
return (FALSE);
|
|
}
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
static void
|
|
clnt_reconnect_close(CLIENT *cl)
|
|
{
|
|
struct rc_data *rc = (struct rc_data *)cl->cl_private;
|
|
CLIENT *client;
|
|
|
|
mtx_lock(&rc->rc_lock);
|
|
|
|
if (rc->rc_closed) {
|
|
mtx_unlock(&rc->rc_lock);
|
|
return;
|
|
}
|
|
|
|
rc->rc_closed = TRUE;
|
|
client = rc->rc_client;
|
|
rc->rc_client = NULL;
|
|
|
|
mtx_unlock(&rc->rc_lock);
|
|
|
|
if (client) {
|
|
CLNT_CLOSE(client);
|
|
CLNT_RELEASE(client);
|
|
}
|
|
}
|
|
|
|
static void
|
|
clnt_reconnect_destroy(CLIENT *cl)
|
|
{
|
|
struct rc_data *rc = (struct rc_data *)cl->cl_private;
|
|
SVCXPRT *xprt;
|
|
|
|
if (rc->rc_client)
|
|
CLNT_DESTROY(rc->rc_client);
|
|
if (rc->rc_backchannel) {
|
|
xprt = (SVCXPRT *)rc->rc_backchannel;
|
|
xprt_unregister(xprt);
|
|
SVC_RELEASE(xprt);
|
|
}
|
|
crfree(rc->rc_ucred);
|
|
mtx_destroy(&rc->rc_lock);
|
|
mem_free(rc, sizeof(*rc));
|
|
mem_free(cl, sizeof (CLIENT));
|
|
}
|