freebsd-skq/sys/nlm/nlm_prot_server.c
dfr 41cea6d5ca Re-implement the client side of rpc.lockd in the kernel. This implementation
provides the correct semantics for flock(2) style locks which are used by the
lockf(1) command line tool and the pidfile(3) library. It also implements
recovery from server restarts and ensures that dirty cache blocks are written
to the server before obtaining locks (allowing multiple clients to use file
locking to safely share data).

Sponsored by:	Isilon Systems
PR:		94256
MFC after:	2 weeks
2008-06-26 10:21:54 +00:00

717 lines
16 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>
#ifndef lint
/*static char sccsid[] = "from: @(#)nlm_prot.x 1.8 87/09/21 Copyr 1987 Sun Micro";*/
/*static char sccsid[] = "from: * @(#)nlm_prot.x 2.1 88/08/01 4.0 RPCSRC";*/
__RCSID("$NetBSD: nlm_prot.x,v 1.6 2000/06/07 14:30:15 bouyer Exp $");
#endif /* not lint */
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <nlm/nlm_prot.h>
#include <nlm/nlm.h>
/**********************************************************************/
/*
* Convert between various versions of the protocol structures.
*/
static void
nlm_convert_to_nlm4_lock(struct nlm4_lock *dst, struct nlm_lock *src)
{
dst->caller_name = src->caller_name;
dst->fh = src->fh;
dst->oh = src->oh;
dst->svid = src->svid;
dst->l_offset = src->l_offset;
dst->l_len = src->l_len;
}
static void
nlm_convert_to_nlm4_share(struct nlm4_share *dst, struct nlm_share *src)
{
dst->caller_name = src->caller_name;
dst->fh = src->fh;
dst->oh = src->oh;
dst->mode = src->mode;
dst->access = src->access;
}
static void
nlm_convert_to_nlm_holder(struct nlm_holder *dst, struct nlm4_holder *src)
{
dst->exclusive = src->exclusive;
dst->svid = src->svid;
dst->oh = src->oh;
dst->l_offset = src->l_offset;
dst->l_len = src->l_len;
}
static void
nlm_convert_to_nlm4_holder(struct nlm4_holder *dst, struct nlm_holder *src)
{
dst->exclusive = src->exclusive;
dst->svid = src->svid;
dst->oh = src->oh;
dst->l_offset = src->l_offset;
dst->l_len = src->l_len;
}
static enum nlm_stats
nlm_convert_to_nlm_stats(enum nlm4_stats src)
{
if (src > nlm4_deadlck)
return nlm_denied;
return (enum nlm_stats) src;
}
static void
nlm_convert_to_nlm_res(struct nlm_res *dst, struct nlm4_res *src)
{
dst->cookie = src->cookie;
dst->stat.stat = nlm_convert_to_nlm_stats(src->stat.stat);
}
static void
nlm_convert_to_nlm4_res(struct nlm4_res *dst, struct nlm_res *src)
{
dst->cookie = src->cookie;
dst->stat.stat = (enum nlm4_stats) src->stat.stat;
}
/**********************************************************************/
/*
* RPC server stubs.
*/
bool_t
nlm_sm_notify_0_svc(struct nlm_sm_status *argp, void *result, struct svc_req *rqstp)
{
nlm_sm_notify(argp);
return (TRUE);
}
bool_t
nlm_test_1_svc(struct nlm_testargs *argp, nlm_testres *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_testargs args4;
nlm4_testres res4;
args4.cookie = argp->cookie;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
retval = nlm4_test_4_svc(&args4, &res4, rqstp);
if (retval) {
result->cookie = res4.cookie;
result->stat.stat = nlm_convert_to_nlm_stats(res4.stat.stat);
if (result->stat.stat == nlm_denied)
nlm_convert_to_nlm_holder(
&result->stat.nlm_testrply_u.holder,
&res4.stat.nlm4_testrply_u.holder);
}
return (retval);
}
bool_t
nlm_lock_1_svc(struct nlm_lockargs *argp, nlm_res *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_lockargs args4;
nlm4_res res4;
args4.cookie = argp->cookie;
args4.block = argp->block;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
args4.reclaim = argp->reclaim;
args4.state = argp->state;
retval = nlm4_lock_4_svc(&args4, &res4, rqstp);
if (retval)
nlm_convert_to_nlm_res(result, &res4);
return (retval);
}
bool_t
nlm_cancel_1_svc(struct nlm_cancargs *argp, nlm_res *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_cancargs args4;
nlm4_res res4;
args4.cookie = argp->cookie;
args4.block = argp->block;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
retval = nlm4_cancel_4_svc(&args4, &res4, rqstp);
if (retval)
nlm_convert_to_nlm_res(result, &res4);
return (retval);
}
bool_t
nlm_unlock_1_svc(struct nlm_unlockargs *argp, nlm_res *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_unlockargs args4;
nlm4_res res4;
args4.cookie = argp->cookie;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
retval = nlm4_unlock_4_svc(&args4, &res4, rqstp);
if (retval)
nlm_convert_to_nlm_res(result, &res4);
return (retval);
}
bool_t
nlm_granted_1_svc(struct nlm_testargs *argp, nlm_res *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_testargs args4;
nlm4_res res4;
args4.cookie = argp->cookie;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
retval = nlm4_granted_4_svc(&args4, &res4, rqstp);
if (retval)
nlm_convert_to_nlm_res(result, &res4);
return (retval);
}
bool_t
nlm_test_msg_1_svc(struct nlm_testargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_testargs args4;
nlm4_testres res4;
nlm_testres res;
CLIENT *rpc;
char dummy;
args4.cookie = argp->cookie;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
if (nlm_do_test(&args4, &res4, rqstp, &rpc))
return (FALSE);
res.cookie = res4.cookie;
res.stat.stat = nlm_convert_to_nlm_stats(res4.stat.stat);
if (res.stat.stat == nlm_denied)
nlm_convert_to_nlm_holder(
&res.stat.nlm_testrply_u.holder,
&res4.stat.nlm4_testrply_u.holder);
if (rpc) {
nlm_test_res_1(&res, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm_testres, &res);
return (FALSE);
}
bool_t
nlm_lock_msg_1_svc(struct nlm_lockargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_lockargs args4;
nlm4_res res4;
nlm_res res;
CLIENT *rpc;
char dummy;
args4.cookie = argp->cookie;
args4.block = argp->block;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
args4.reclaim = argp->reclaim;
args4.state = argp->state;
if (nlm_do_lock(&args4, &res4, rqstp, TRUE, &rpc))
return (FALSE);
nlm_convert_to_nlm_res(&res, &res4);
if (rpc) {
nlm_lock_res_1(&res, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm_res, &res);
return (FALSE);
}
bool_t
nlm_cancel_msg_1_svc(struct nlm_cancargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_cancargs args4;
nlm4_res res4;
nlm_res res;
CLIENT *rpc;
char dummy;
args4.cookie = argp->cookie;
args4.block = argp->block;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
if (nlm_do_cancel(&args4, &res4, rqstp, &rpc))
return (FALSE);
nlm_convert_to_nlm_res(&res, &res4);
if (rpc) {
nlm_cancel_res_1(&res, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm_res, &res);
return (FALSE);
}
bool_t
nlm_unlock_msg_1_svc(struct nlm_unlockargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_unlockargs args4;
nlm4_res res4;
nlm_res res;
CLIENT *rpc;
char dummy;
args4.cookie = argp->cookie;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
if (nlm_do_unlock(&args4, &res4, rqstp, &rpc))
return (FALSE);
nlm_convert_to_nlm_res(&res, &res4);
if (rpc) {
nlm_unlock_res_1(&res, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm_res, &res);
return (FALSE);
}
bool_t
nlm_granted_msg_1_svc(struct nlm_testargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_testargs args4;
nlm4_res res4;
nlm_res res;
CLIENT *rpc;
char dummy;
args4.cookie = argp->cookie;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
if (nlm_do_granted(&args4, &res4, rqstp, &rpc))
return (FALSE);
nlm_convert_to_nlm_res(&res, &res4);
if (rpc) {
nlm_granted_res_1(&res, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm_res, &res);
return (FALSE);
}
bool_t
nlm_test_res_1_svc(nlm_testres *argp, void *result, struct svc_req *rqstp)
{
nlm4_testres args4;
args4.cookie = argp->cookie;
if (argp->stat.stat == nlm_denied)
nlm_convert_to_nlm4_holder(
&args4.stat.nlm4_testrply_u.holder,
&argp->stat.nlm_testrply_u.holder);
return (nlm4_test_res_4_svc(&args4, result, rqstp));
}
bool_t
nlm_lock_res_1_svc(nlm_res *argp, void *result, struct svc_req *rqstp)
{
nlm4_res arg4;
nlm_convert_to_nlm4_res(&arg4, argp);
return (nlm4_lock_res_4_svc(&arg4, result, rqstp));
}
bool_t
nlm_cancel_res_1_svc(nlm_res *argp, void *result, struct svc_req *rqstp)
{
nlm4_res arg4;
nlm_convert_to_nlm4_res(&arg4, argp);
return (nlm4_cancel_res_4_svc(&arg4, result, rqstp));
}
bool_t
nlm_unlock_res_1_svc(nlm_res *argp, void *result, struct svc_req *rqstp)
{
nlm4_res arg4;
nlm_convert_to_nlm4_res(&arg4, argp);
return (nlm4_unlock_res_4_svc(&arg4, result, rqstp));
}
bool_t
nlm_granted_res_1_svc(nlm_res *argp, void *result, struct svc_req *rqstp)
{
nlm4_res arg4;
nlm_convert_to_nlm4_res(&arg4, argp);
return (nlm4_granted_res_4_svc(&arg4, result, rqstp));
}
int
nlm_prog_1_freeresult(SVCXPRT *transp, xdrproc_t xdr_result, caddr_t result)
{
(void) xdr_free(xdr_result, result);
return (TRUE);
}
bool_t
nlm_share_3_svc(nlm_shareargs *argp, nlm_shareres *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_shareargs args4;
nlm4_shareres res4;
args4.cookie = argp->cookie;
nlm_convert_to_nlm4_share(&args4.share, &argp->share);
args4.reclaim = argp->reclaim;
retval = nlm4_share_4_svc(&args4, &res4, rqstp);
if (retval) {
result->cookie = res4.cookie;
result->stat = nlm_convert_to_nlm_stats(res4.stat);
result->sequence = res4.sequence;
}
return (retval);
}
bool_t
nlm_unshare_3_svc(nlm_shareargs *argp, nlm_shareres *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_shareargs args4;
nlm4_shareres res4;
args4.cookie = argp->cookie;
nlm_convert_to_nlm4_share(&args4.share, &argp->share);
args4.reclaim = argp->reclaim;
retval = nlm4_unshare_4_svc(&args4, &res4, rqstp);
if (retval) {
result->cookie = res4.cookie;
result->stat = nlm_convert_to_nlm_stats(res4.stat);
result->sequence = res4.sequence;
}
return (retval);
}
bool_t
nlm_nm_lock_3_svc(nlm_lockargs *argp, nlm_res *result, struct svc_req *rqstp)
{
bool_t retval;
nlm4_lockargs args4;
nlm4_res res4;
args4.cookie = argp->cookie;
args4.block = argp->block;
args4.exclusive = argp->exclusive;
nlm_convert_to_nlm4_lock(&args4.alock, &argp->alock);
args4.reclaim = argp->reclaim;
args4.state = argp->state;
retval = nlm4_nm_lock_4_svc(&args4, &res4, rqstp);
if (retval)
nlm_convert_to_nlm_res(result, &res4);
return (retval);
}
bool_t
nlm_free_all_3_svc(nlm_notify *argp, void *result, struct svc_req *rqstp)
{
struct nlm4_notify args4;
args4.name = argp->name;
args4.state = argp->state;
return (nlm4_free_all_4_svc(&args4, result, rqstp));
}
int
nlm_prog_3_freeresult(SVCXPRT *transp, xdrproc_t xdr_result, caddr_t result)
{
(void) xdr_free(xdr_result, result);
return (TRUE);
}
bool_t
nlm4_test_4_svc(nlm4_testargs *argp, nlm4_testres *result, struct svc_req *rqstp)
{
nlm_do_test(argp, result, rqstp, NULL);
return (TRUE);
}
bool_t
nlm4_lock_4_svc(nlm4_lockargs *argp, nlm4_res *result, struct svc_req *rqstp)
{
nlm_do_lock(argp, result, rqstp, TRUE, NULL);
return (TRUE);
}
bool_t
nlm4_cancel_4_svc(nlm4_cancargs *argp, nlm4_res *result, struct svc_req *rqstp)
{
nlm_do_cancel(argp, result, rqstp, NULL);
return (TRUE);
}
bool_t
nlm4_unlock_4_svc(nlm4_unlockargs *argp, nlm4_res *result, struct svc_req *rqstp)
{
nlm_do_unlock(argp, result, rqstp, NULL);
return (TRUE);
}
bool_t
nlm4_granted_4_svc(nlm4_testargs *argp, nlm4_res *result, struct svc_req *rqstp)
{
nlm_do_granted(argp, result, rqstp, NULL);
return (TRUE);
}
bool_t
nlm4_test_msg_4_svc(nlm4_testargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_testres res4;
CLIENT *rpc;
char dummy;
if (nlm_do_test(argp, &res4, rqstp, &rpc))
return (FALSE);
if (rpc) {
nlm4_test_res_4(&res4, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm4_testres, &res4);
return (FALSE);
}
bool_t
nlm4_lock_msg_4_svc(nlm4_lockargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_res res4;
CLIENT *rpc;
char dummy;
if (nlm_do_lock(argp, &res4, rqstp, TRUE, &rpc))
return (FALSE);
if (rpc) {
nlm4_lock_res_4(&res4, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm4_res, &res4);
return (FALSE);
}
bool_t
nlm4_cancel_msg_4_svc(nlm4_cancargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_res res4;
CLIENT *rpc;
char dummy;
if (nlm_do_cancel(argp, &res4, rqstp, &rpc))
return (FALSE);
if (rpc) {
nlm4_cancel_res_4(&res4, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm4_res, &res4);
return (FALSE);
}
bool_t
nlm4_unlock_msg_4_svc(nlm4_unlockargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_res res4;
CLIENT *rpc;
char dummy;
if (nlm_do_unlock(argp, &res4, rqstp, &rpc))
if (rpc) {
nlm4_unlock_res_4(&res4, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm4_res, &res4);
return (FALSE);
}
bool_t
nlm4_granted_msg_4_svc(nlm4_testargs *argp, void *result, struct svc_req *rqstp)
{
nlm4_res res4;
CLIENT *rpc;
char dummy;
if (nlm_do_granted(argp, &res4, rqstp, &rpc))
return (FALSE);
if (rpc) {
nlm4_granted_res_4(&res4, &dummy, rpc, NULL, nlm_zero_tv);
CLNT_RELEASE(rpc);
}
xdr_free((xdrproc_t) xdr_nlm4_res, &res4);
return (FALSE);
}
bool_t
nlm4_test_res_4_svc(nlm4_testres *argp, void *result, struct svc_req *rqstp)
{
return (FALSE);
}
bool_t
nlm4_lock_res_4_svc(nlm4_res *argp, void *result, struct svc_req *rqstp)
{
return (FALSE);
}
bool_t
nlm4_cancel_res_4_svc(nlm4_res *argp, void *result, struct svc_req *rqstp)
{
return (FALSE);
}
bool_t
nlm4_unlock_res_4_svc(nlm4_res *argp, void *result, struct svc_req *rqstp)
{
return (FALSE);
}
bool_t
nlm4_granted_res_4_svc(nlm4_res *argp, void *result, struct svc_req *rqstp)
{
return (FALSE);
}
bool_t
nlm4_share_4_svc(nlm4_shareargs *argp, nlm4_shareres *result, struct svc_req *rqstp)
{
memset(result, 0, sizeof(*result));
result->stat = nlm4_denied;
return (TRUE);
}
bool_t
nlm4_unshare_4_svc(nlm4_shareargs *argp, nlm4_shareres *result, struct svc_req *rqstp)
{
memset(result, 0, sizeof(*result));
result->stat = nlm4_denied;
return (TRUE);
}
bool_t
nlm4_nm_lock_4_svc(nlm4_lockargs *argp, nlm4_res *result, struct svc_req *rqstp)
{
nlm_do_lock(argp, result, rqstp, FALSE, NULL);
return (TRUE);
}
bool_t
nlm4_free_all_4_svc(nlm4_notify *argp, void *result, struct svc_req *rqstp)
{
nlm_do_free_all(argp);
return (TRUE);
}
int
nlm_prog_4_freeresult(SVCXPRT *transp, xdrproc_t xdr_result, caddr_t result)
{
(void) xdr_free(xdr_result, result);
return (TRUE);
}