2413 lines
58 KiB
C
2413 lines
58 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* 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 "opt_inet6.h"
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/fail.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/lockf.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/taskqueue.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <nfs/nfsproto.h>
|
|
#include <nfs/nfs_lock.h>
|
|
|
|
#include <nlm/nlm_prot.h>
|
|
#include <nlm/sm_inter.h>
|
|
#include <nlm/nlm.h>
|
|
#include <rpc/rpc_com.h>
|
|
#include <rpc/rpcb_prot.h>
|
|
|
|
MALLOC_DEFINE(M_NLM, "NLM", "Network Lock Manager");
|
|
|
|
/*
|
|
* If a host is inactive (and holds no locks) for this amount of
|
|
* seconds, we consider it idle and stop tracking it.
|
|
*/
|
|
#define NLM_IDLE_TIMEOUT 30
|
|
|
|
/*
|
|
* We check the host list for idle every few seconds.
|
|
*/
|
|
#define NLM_IDLE_PERIOD 5
|
|
|
|
/*
|
|
* We only look for GRANTED_RES messages for a little while.
|
|
*/
|
|
#define NLM_EXPIRE_TIMEOUT 10
|
|
|
|
/*
|
|
* Support for sysctl vfs.nlm.sysid
|
|
*/
|
|
static SYSCTL_NODE(_vfs, OID_AUTO, nlm, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
|
|
"Network Lock Manager");
|
|
static SYSCTL_NODE(_vfs_nlm, OID_AUTO, sysid,
|
|
CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
|
|
"");
|
|
|
|
/*
|
|
* Syscall hooks
|
|
*/
|
|
static struct syscall_helper_data nlm_syscalls[] = {
|
|
SYSCALL_INIT_HELPER(nlm_syscall),
|
|
SYSCALL_INIT_LAST
|
|
};
|
|
|
|
/*
|
|
* Debug level passed in from userland. We also support a sysctl hook
|
|
* so that it can be changed on a live system.
|
|
*/
|
|
static int nlm_debug_level;
|
|
SYSCTL_INT(_debug, OID_AUTO, nlm_debug, CTLFLAG_RW, &nlm_debug_level, 0, "");
|
|
|
|
#define NLM_DEBUG(_level, args...) \
|
|
do { \
|
|
if (nlm_debug_level >= (_level)) \
|
|
log(LOG_DEBUG, args); \
|
|
} while(0)
|
|
#define NLM_ERR(args...) \
|
|
do { \
|
|
log(LOG_ERR, args); \
|
|
} while(0)
|
|
|
|
/*
|
|
* Grace period handling. The value of nlm_grace_threshold is the
|
|
* value of time_uptime after which we are serving requests normally.
|
|
*/
|
|
static time_t nlm_grace_threshold;
|
|
|
|
/*
|
|
* We check for idle hosts if time_uptime is greater than
|
|
* nlm_next_idle_check,
|
|
*/
|
|
static time_t nlm_next_idle_check;
|
|
|
|
/*
|
|
* A flag to indicate the server is already running.
|
|
*/
|
|
static int nlm_is_running;
|
|
|
|
/*
|
|
* A socket to use for RPC - shared by all IPv4 RPC clients.
|
|
*/
|
|
static struct socket *nlm_socket;
|
|
|
|
#ifdef INET6
|
|
|
|
/*
|
|
* A socket to use for RPC - shared by all IPv6 RPC clients.
|
|
*/
|
|
static struct socket *nlm_socket6;
|
|
|
|
#endif
|
|
|
|
/*
|
|
* An RPC client handle that can be used to communicate with the local
|
|
* NSM.
|
|
*/
|
|
static CLIENT *nlm_nsm;
|
|
|
|
/*
|
|
* An AUTH handle for the server's creds.
|
|
*/
|
|
static AUTH *nlm_auth;
|
|
|
|
/*
|
|
* A zero timeval for sending async RPC messages.
|
|
*/
|
|
struct timeval nlm_zero_tv = { 0, 0 };
|
|
|
|
/*
|
|
* The local NSM state number
|
|
*/
|
|
int nlm_nsm_state;
|
|
|
|
/*
|
|
* A lock to protect the host list and waiting lock list.
|
|
*/
|
|
static struct mtx nlm_global_lock;
|
|
|
|
/*
|
|
* Locks:
|
|
* (l) locked by nh_lock
|
|
* (s) only accessed via server RPC which is single threaded
|
|
* (g) locked by nlm_global_lock
|
|
* (c) const until freeing
|
|
* (a) modified using atomic ops
|
|
*/
|
|
|
|
/*
|
|
* A pending client-side lock request, stored on the nlm_waiting_locks
|
|
* list.
|
|
*/
|
|
struct nlm_waiting_lock {
|
|
TAILQ_ENTRY(nlm_waiting_lock) nw_link; /* (g) */
|
|
bool_t nw_waiting; /* (g) */
|
|
nlm4_lock nw_lock; /* (c) */
|
|
union nfsfh nw_fh; /* (c) */
|
|
struct vnode *nw_vp; /* (c) */
|
|
};
|
|
TAILQ_HEAD(nlm_waiting_lock_list, nlm_waiting_lock);
|
|
|
|
struct nlm_waiting_lock_list nlm_waiting_locks; /* (g) */
|
|
|
|
/*
|
|
* A pending server-side asynchronous lock request, stored on the
|
|
* nh_pending list of the NLM host.
|
|
*/
|
|
struct nlm_async_lock {
|
|
TAILQ_ENTRY(nlm_async_lock) af_link; /* (l) host's list of locks */
|
|
struct task af_task; /* (c) async callback details */
|
|
void *af_cookie; /* (l) lock manager cancel token */
|
|
struct vnode *af_vp; /* (l) vnode to lock */
|
|
struct flock af_fl; /* (c) lock details */
|
|
struct nlm_host *af_host; /* (c) host which is locking */
|
|
CLIENT *af_rpc; /* (c) rpc client to send message */
|
|
nlm4_testargs af_granted; /* (c) notification details */
|
|
time_t af_expiretime; /* (c) notification time */
|
|
};
|
|
TAILQ_HEAD(nlm_async_lock_list, nlm_async_lock);
|
|
|
|
/*
|
|
* NLM host.
|
|
*/
|
|
enum nlm_host_state {
|
|
NLM_UNMONITORED,
|
|
NLM_MONITORED,
|
|
NLM_MONITOR_FAILED,
|
|
NLM_RECOVERING
|
|
};
|
|
|
|
struct nlm_rpc {
|
|
CLIENT *nr_client; /* (l) RPC client handle */
|
|
time_t nr_create_time; /* (l) when client was created */
|
|
};
|
|
|
|
struct nlm_host {
|
|
struct mtx nh_lock;
|
|
volatile u_int nh_refs; /* (a) reference count */
|
|
TAILQ_ENTRY(nlm_host) nh_link; /* (g) global list of hosts */
|
|
char nh_caller_name[MAXNAMELEN]; /* (c) printable name of host */
|
|
uint32_t nh_sysid; /* (c) our allocaed system ID */
|
|
char nh_sysid_string[10]; /* (c) string rep. of sysid */
|
|
struct sockaddr_storage nh_addr; /* (s) remote address of host */
|
|
struct nlm_rpc nh_srvrpc; /* (l) RPC for server replies */
|
|
struct nlm_rpc nh_clntrpc; /* (l) RPC for client requests */
|
|
rpcvers_t nh_vers; /* (s) NLM version of host */
|
|
int nh_state; /* (s) last seen NSM state of host */
|
|
enum nlm_host_state nh_monstate; /* (l) local NSM monitoring state */
|
|
time_t nh_idle_timeout; /* (s) Time at which host is idle */
|
|
struct sysctl_ctx_list nh_sysctl; /* (c) vfs.nlm.sysid nodes */
|
|
uint32_t nh_grantcookie; /* (l) grant cookie counter */
|
|
struct nlm_async_lock_list nh_pending; /* (l) pending async locks */
|
|
struct nlm_async_lock_list nh_granted; /* (l) granted locks */
|
|
struct nlm_async_lock_list nh_finished; /* (l) finished async locks */
|
|
};
|
|
TAILQ_HEAD(nlm_host_list, nlm_host);
|
|
|
|
static struct nlm_host_list nlm_hosts; /* (g) */
|
|
static uint32_t nlm_next_sysid = 1; /* (g) */
|
|
|
|
static void nlm_host_unmonitor(struct nlm_host *);
|
|
|
|
struct nlm_grantcookie {
|
|
uint32_t ng_sysid;
|
|
uint32_t ng_cookie;
|
|
};
|
|
|
|
static inline uint32_t
|
|
ng_sysid(struct netobj *src)
|
|
{
|
|
|
|
return ((struct nlm_grantcookie *)src->n_bytes)->ng_sysid;
|
|
}
|
|
|
|
static inline uint32_t
|
|
ng_cookie(struct netobj *src)
|
|
{
|
|
|
|
return ((struct nlm_grantcookie *)src->n_bytes)->ng_cookie;
|
|
}
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* Initialise NLM globals.
|
|
*/
|
|
static int
|
|
nlm_init(void)
|
|
{
|
|
int error;
|
|
|
|
mtx_init(&nlm_global_lock, "nlm_global_lock", NULL, MTX_DEF);
|
|
TAILQ_INIT(&nlm_waiting_locks);
|
|
TAILQ_INIT(&nlm_hosts);
|
|
|
|
error = syscall_helper_register(nlm_syscalls, SY_THR_STATIC_KLD);
|
|
if (error != 0)
|
|
NLM_ERR("Can't register NLM syscall\n");
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
nlm_uninit(void)
|
|
{
|
|
|
|
syscall_helper_unregister(nlm_syscalls);
|
|
}
|
|
|
|
/*
|
|
* Create a netobj from an arbitrary source.
|
|
*/
|
|
void
|
|
nlm_make_netobj(struct netobj *dst, caddr_t src, size_t srcsize,
|
|
struct malloc_type *type)
|
|
{
|
|
|
|
dst->n_len = srcsize;
|
|
dst->n_bytes = malloc(srcsize, type, M_WAITOK);
|
|
memcpy(dst->n_bytes, src, srcsize);
|
|
}
|
|
|
|
/*
|
|
* Copy a struct netobj.
|
|
*/
|
|
void
|
|
nlm_copy_netobj(struct netobj *dst, struct netobj *src,
|
|
struct malloc_type *type)
|
|
{
|
|
|
|
nlm_make_netobj(dst, src->n_bytes, src->n_len, type);
|
|
}
|
|
|
|
/*
|
|
* Create an RPC client handle for the given (address,prog,vers)
|
|
* triple using UDP.
|
|
*/
|
|
static CLIENT *
|
|
nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
|
|
{
|
|
char *wchan = "nlmrcv";
|
|
struct sockaddr_storage ss;
|
|
struct socket *so;
|
|
CLIENT *rpcb;
|
|
struct timeval timo;
|
|
RPCB parms;
|
|
char *uaddr;
|
|
enum clnt_stat stat = RPC_SUCCESS;
|
|
int rpcvers = RPCBVERS4;
|
|
bool_t do_tcp = FALSE;
|
|
bool_t tryagain = FALSE;
|
|
struct portmap mapping;
|
|
u_short port = 0;
|
|
|
|
/*
|
|
* First we need to contact the remote RPCBIND service to find
|
|
* the right port.
|
|
*/
|
|
memcpy(&ss, sa, sa->sa_len);
|
|
switch (ss.ss_family) {
|
|
case AF_INET:
|
|
((struct sockaddr_in *)&ss)->sin_port = htons(111);
|
|
so = nlm_socket;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)&ss)->sin6_port = htons(111);
|
|
so = nlm_socket6;
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
/*
|
|
* Unsupported address family - fail.
|
|
*/
|
|
return (NULL);
|
|
}
|
|
|
|
rpcb = clnt_dg_create(so, (struct sockaddr *)&ss,
|
|
RPCBPROG, rpcvers, 0, 0);
|
|
if (!rpcb)
|
|
return (NULL);
|
|
|
|
try_tcp:
|
|
parms.r_prog = prog;
|
|
parms.r_vers = vers;
|
|
if (do_tcp)
|
|
parms.r_netid = "tcp";
|
|
else
|
|
parms.r_netid = "udp";
|
|
parms.r_addr = "";
|
|
parms.r_owner = "";
|
|
|
|
/*
|
|
* Use the default timeout.
|
|
*/
|
|
timo.tv_sec = 25;
|
|
timo.tv_usec = 0;
|
|
again:
|
|
switch (rpcvers) {
|
|
case RPCBVERS4:
|
|
case RPCBVERS:
|
|
/*
|
|
* Try RPCBIND 4 then 3.
|
|
*/
|
|
uaddr = NULL;
|
|
stat = CLNT_CALL(rpcb, (rpcprog_t) RPCBPROC_GETADDR,
|
|
(xdrproc_t) xdr_rpcb, &parms,
|
|
(xdrproc_t) xdr_wrapstring, &uaddr, timo);
|
|
if (stat == RPC_SUCCESS) {
|
|
/*
|
|
* We have a reply from the remote RPCBIND - turn it
|
|
* into an appropriate address and make a new client
|
|
* that can talk to the remote NLM.
|
|
*
|
|
* XXX fixup IPv6 scope ID.
|
|
*/
|
|
struct netbuf *a;
|
|
a = __rpc_uaddr2taddr_af(ss.ss_family, uaddr);
|
|
if (!a) {
|
|
tryagain = TRUE;
|
|
} else {
|
|
tryagain = FALSE;
|
|
memcpy(&ss, a->buf, a->len);
|
|
free(a->buf, M_RPC);
|
|
free(a, M_RPC);
|
|
xdr_free((xdrproc_t) xdr_wrapstring, &uaddr);
|
|
}
|
|
}
|
|
if (tryagain || stat == RPC_PROGVERSMISMATCH) {
|
|
if (rpcvers == RPCBVERS4)
|
|
rpcvers = RPCBVERS;
|
|
else if (rpcvers == RPCBVERS)
|
|
rpcvers = PMAPVERS;
|
|
CLNT_CONTROL(rpcb, CLSET_VERS, &rpcvers);
|
|
goto again;
|
|
}
|
|
break;
|
|
case PMAPVERS:
|
|
/*
|
|
* Try portmap.
|
|
*/
|
|
mapping.pm_prog = parms.r_prog;
|
|
mapping.pm_vers = parms.r_vers;
|
|
mapping.pm_prot = do_tcp ? IPPROTO_TCP : IPPROTO_UDP;
|
|
mapping.pm_port = 0;
|
|
|
|
stat = CLNT_CALL(rpcb, (rpcprog_t) PMAPPROC_GETPORT,
|
|
(xdrproc_t) xdr_portmap, &mapping,
|
|
(xdrproc_t) xdr_u_short, &port, timo);
|
|
|
|
if (stat == RPC_SUCCESS) {
|
|
switch (ss.ss_family) {
|
|
case AF_INET:
|
|
((struct sockaddr_in *)&ss)->sin_port =
|
|
htons(port);
|
|
break;
|
|
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)&ss)->sin6_port =
|
|
htons(port);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
panic("invalid rpcvers %d", rpcvers);
|
|
}
|
|
/*
|
|
* We may have a positive response from the portmapper, but the NLM
|
|
* service was not found. Make sure we received a valid port.
|
|
*/
|
|
switch (ss.ss_family) {
|
|
case AF_INET:
|
|
port = ((struct sockaddr_in *)&ss)->sin_port;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
port = ((struct sockaddr_in6 *)&ss)->sin6_port;
|
|
break;
|
|
#endif
|
|
}
|
|
if (stat != RPC_SUCCESS || !port) {
|
|
/*
|
|
* If we were able to talk to rpcbind or portmap, but the udp
|
|
* variant wasn't available, ask about tcp.
|
|
*
|
|
* XXX - We could also check for a TCP portmapper, but
|
|
* if the host is running a portmapper at all, we should be able
|
|
* to hail it over UDP.
|
|
*/
|
|
if (stat == RPC_SUCCESS && !do_tcp) {
|
|
do_tcp = TRUE;
|
|
goto try_tcp;
|
|
}
|
|
|
|
/* Otherwise, bad news. */
|
|
NLM_ERR("NLM: failed to contact remote rpcbind, "
|
|
"stat = %d, port = %d\n", (int) stat, port);
|
|
CLNT_DESTROY(rpcb);
|
|
return (NULL);
|
|
}
|
|
|
|
if (do_tcp) {
|
|
/*
|
|
* Destroy the UDP client we used to speak to rpcbind and
|
|
* recreate as a TCP client.
|
|
*/
|
|
struct netconfig *nconf = NULL;
|
|
|
|
CLNT_DESTROY(rpcb);
|
|
|
|
switch (ss.ss_family) {
|
|
case AF_INET:
|
|
nconf = getnetconfigent("tcp");
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
nconf = getnetconfigent("tcp6");
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
rpcb = clnt_reconnect_create(nconf, (struct sockaddr *)&ss,
|
|
prog, vers, 0, 0);
|
|
CLNT_CONTROL(rpcb, CLSET_WAITCHAN, wchan);
|
|
rpcb->cl_auth = nlm_auth;
|
|
|
|
} else {
|
|
/*
|
|
* Re-use the client we used to speak to rpcbind.
|
|
*/
|
|
CLNT_CONTROL(rpcb, CLSET_SVC_ADDR, &ss);
|
|
CLNT_CONTROL(rpcb, CLSET_PROG, &prog);
|
|
CLNT_CONTROL(rpcb, CLSET_VERS, &vers);
|
|
CLNT_CONTROL(rpcb, CLSET_WAITCHAN, wchan);
|
|
rpcb->cl_auth = nlm_auth;
|
|
}
|
|
|
|
return (rpcb);
|
|
}
|
|
|
|
/*
|
|
* This async callback after when an async lock request has been
|
|
* granted. We notify the host which initiated the request.
|
|
*/
|
|
static void
|
|
nlm_lock_callback(void *arg, int pending)
|
|
{
|
|
struct nlm_async_lock *af = (struct nlm_async_lock *) arg;
|
|
struct rpc_callextra ext;
|
|
|
|
NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) granted,"
|
|
" cookie %d:%d\n", af, af->af_host->nh_caller_name,
|
|
af->af_host->nh_sysid, ng_sysid(&af->af_granted.cookie),
|
|
ng_cookie(&af->af_granted.cookie));
|
|
|
|
/*
|
|
* Send the results back to the host.
|
|
*
|
|
* Note: there is a possible race here with nlm_host_notify
|
|
* destroying the RPC client. To avoid problems, the first
|
|
* thing nlm_host_notify does is to cancel pending async lock
|
|
* requests.
|
|
*/
|
|
memset(&ext, 0, sizeof(ext));
|
|
ext.rc_auth = nlm_auth;
|
|
if (af->af_host->nh_vers == NLM_VERS4) {
|
|
nlm4_granted_msg_4(&af->af_granted,
|
|
NULL, af->af_rpc, &ext, nlm_zero_tv);
|
|
} else {
|
|
/*
|
|
* Back-convert to legacy protocol
|
|
*/
|
|
nlm_testargs granted;
|
|
granted.cookie = af->af_granted.cookie;
|
|
granted.exclusive = af->af_granted.exclusive;
|
|
granted.alock.caller_name =
|
|
af->af_granted.alock.caller_name;
|
|
granted.alock.fh = af->af_granted.alock.fh;
|
|
granted.alock.oh = af->af_granted.alock.oh;
|
|
granted.alock.svid = af->af_granted.alock.svid;
|
|
granted.alock.l_offset =
|
|
af->af_granted.alock.l_offset;
|
|
granted.alock.l_len =
|
|
af->af_granted.alock.l_len;
|
|
|
|
nlm_granted_msg_1(&granted,
|
|
NULL, af->af_rpc, &ext, nlm_zero_tv);
|
|
}
|
|
|
|
/*
|
|
* Move this entry to the nh_granted list.
|
|
*/
|
|
af->af_expiretime = time_uptime + NLM_EXPIRE_TIMEOUT;
|
|
mtx_lock(&af->af_host->nh_lock);
|
|
TAILQ_REMOVE(&af->af_host->nh_pending, af, af_link);
|
|
TAILQ_INSERT_TAIL(&af->af_host->nh_granted, af, af_link);
|
|
mtx_unlock(&af->af_host->nh_lock);
|
|
}
|
|
|
|
/*
|
|
* Free an async lock request. The request must have been removed from
|
|
* any list.
|
|
*/
|
|
static void
|
|
nlm_free_async_lock(struct nlm_async_lock *af)
|
|
{
|
|
/*
|
|
* Free an async lock.
|
|
*/
|
|
if (af->af_rpc)
|
|
CLNT_RELEASE(af->af_rpc);
|
|
xdr_free((xdrproc_t) xdr_nlm4_testargs, &af->af_granted);
|
|
if (af->af_vp)
|
|
vrele(af->af_vp);
|
|
free(af, M_NLM);
|
|
}
|
|
|
|
/*
|
|
* Cancel our async request - this must be called with
|
|
* af->nh_host->nh_lock held. This is slightly complicated by a
|
|
* potential race with our own callback. If we fail to cancel the
|
|
* lock, it must already have been granted - we make sure our async
|
|
* task has completed by calling taskqueue_drain in this case.
|
|
*/
|
|
static int
|
|
nlm_cancel_async_lock(struct nlm_async_lock *af)
|
|
{
|
|
struct nlm_host *host = af->af_host;
|
|
int error;
|
|
|
|
mtx_assert(&host->nh_lock, MA_OWNED);
|
|
|
|
mtx_unlock(&host->nh_lock);
|
|
|
|
error = VOP_ADVLOCKASYNC(af->af_vp, NULL, F_CANCEL, &af->af_fl,
|
|
F_REMOTE, NULL, &af->af_cookie);
|
|
|
|
if (error) {
|
|
/*
|
|
* We failed to cancel - make sure our callback has
|
|
* completed before we continue.
|
|
*/
|
|
taskqueue_drain(taskqueue_thread, &af->af_task);
|
|
}
|
|
|
|
mtx_lock(&host->nh_lock);
|
|
|
|
if (!error) {
|
|
NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) "
|
|
"cancelled\n", af, host->nh_caller_name, host->nh_sysid);
|
|
|
|
/*
|
|
* Remove from the nh_pending list and free now that
|
|
* we are safe from the callback.
|
|
*/
|
|
TAILQ_REMOVE(&host->nh_pending, af, af_link);
|
|
mtx_unlock(&host->nh_lock);
|
|
nlm_free_async_lock(af);
|
|
mtx_lock(&host->nh_lock);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
nlm_check_expired_locks(struct nlm_host *host)
|
|
{
|
|
struct nlm_async_lock *af;
|
|
time_t uptime = time_uptime;
|
|
|
|
mtx_lock(&host->nh_lock);
|
|
while ((af = TAILQ_FIRST(&host->nh_granted)) != NULL
|
|
&& uptime >= af->af_expiretime) {
|
|
NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) expired,"
|
|
" cookie %d:%d\n", af, af->af_host->nh_caller_name,
|
|
af->af_host->nh_sysid, ng_sysid(&af->af_granted.cookie),
|
|
ng_cookie(&af->af_granted.cookie));
|
|
TAILQ_REMOVE(&host->nh_granted, af, af_link);
|
|
mtx_unlock(&host->nh_lock);
|
|
nlm_free_async_lock(af);
|
|
mtx_lock(&host->nh_lock);
|
|
}
|
|
while ((af = TAILQ_FIRST(&host->nh_finished)) != NULL) {
|
|
TAILQ_REMOVE(&host->nh_finished, af, af_link);
|
|
mtx_unlock(&host->nh_lock);
|
|
nlm_free_async_lock(af);
|
|
mtx_lock(&host->nh_lock);
|
|
}
|
|
mtx_unlock(&host->nh_lock);
|
|
}
|
|
|
|
/*
|
|
* Free resources used by a host. This is called after the reference
|
|
* count has reached zero so it doesn't need to worry about locks.
|
|
*/
|
|
static void
|
|
nlm_host_destroy(struct nlm_host *host)
|
|
{
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
TAILQ_REMOVE(&nlm_hosts, host, nh_link);
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
if (host->nh_srvrpc.nr_client)
|
|
CLNT_RELEASE(host->nh_srvrpc.nr_client);
|
|
if (host->nh_clntrpc.nr_client)
|
|
CLNT_RELEASE(host->nh_clntrpc.nr_client);
|
|
mtx_destroy(&host->nh_lock);
|
|
sysctl_ctx_free(&host->nh_sysctl);
|
|
free(host, M_NLM);
|
|
}
|
|
|
|
/*
|
|
* Thread start callback for client lock recovery
|
|
*/
|
|
static void
|
|
nlm_client_recovery_start(void *arg)
|
|
{
|
|
struct nlm_host *host = (struct nlm_host *) arg;
|
|
|
|
NLM_DEBUG(1, "NLM: client lock recovery for %s started\n",
|
|
host->nh_caller_name);
|
|
|
|
nlm_client_recovery(host);
|
|
|
|
NLM_DEBUG(1, "NLM: client lock recovery for %s completed\n",
|
|
host->nh_caller_name);
|
|
|
|
host->nh_monstate = NLM_MONITORED;
|
|
nlm_host_release(host);
|
|
|
|
kthread_exit();
|
|
}
|
|
|
|
/*
|
|
* This is called when we receive a host state change notification. We
|
|
* unlock any active locks owned by the host. When rpc.lockd is
|
|
* shutting down, this function is called with newstate set to zero
|
|
* which allows us to cancel any pending async locks and clear the
|
|
* locking state.
|
|
*/
|
|
static void
|
|
nlm_host_notify(struct nlm_host *host, int newstate)
|
|
{
|
|
struct nlm_async_lock *af;
|
|
|
|
if (newstate) {
|
|
NLM_DEBUG(1, "NLM: host %s (sysid %d) rebooted, new "
|
|
"state is %d\n", host->nh_caller_name,
|
|
host->nh_sysid, newstate);
|
|
}
|
|
|
|
/*
|
|
* Cancel any pending async locks for this host.
|
|
*/
|
|
mtx_lock(&host->nh_lock);
|
|
while ((af = TAILQ_FIRST(&host->nh_pending)) != NULL) {
|
|
/*
|
|
* nlm_cancel_async_lock will remove the entry from
|
|
* nh_pending and free it.
|
|
*/
|
|
nlm_cancel_async_lock(af);
|
|
}
|
|
mtx_unlock(&host->nh_lock);
|
|
nlm_check_expired_locks(host);
|
|
|
|
/*
|
|
* The host just rebooted - trash its locks.
|
|
*/
|
|
lf_clearremotesys(host->nh_sysid);
|
|
host->nh_state = newstate;
|
|
|
|
/*
|
|
* If we have any remote locks for this host (i.e. it
|
|
* represents a remote NFS server that our local NFS client
|
|
* has locks for), start a recovery thread.
|
|
*/
|
|
if (newstate != 0
|
|
&& host->nh_monstate != NLM_RECOVERING
|
|
&& lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid) > 0) {
|
|
struct thread *td;
|
|
host->nh_monstate = NLM_RECOVERING;
|
|
refcount_acquire(&host->nh_refs);
|
|
kthread_add(nlm_client_recovery_start, host, curproc, &td, 0, 0,
|
|
"NFS lock recovery for %s", host->nh_caller_name);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Sysctl handler to count the number of locks for a sysid.
|
|
*/
|
|
static int
|
|
nlm_host_lock_count_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct nlm_host *host;
|
|
int count;
|
|
|
|
host = oidp->oid_arg1;
|
|
count = lf_countlocks(host->nh_sysid);
|
|
return sysctl_handle_int(oidp, &count, 0, req);
|
|
}
|
|
|
|
/*
|
|
* Sysctl handler to count the number of client locks for a sysid.
|
|
*/
|
|
static int
|
|
nlm_host_client_lock_count_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct nlm_host *host;
|
|
int count;
|
|
|
|
host = oidp->oid_arg1;
|
|
count = lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid);
|
|
return sysctl_handle_int(oidp, &count, 0, req);
|
|
}
|
|
|
|
/*
|
|
* Create a new NLM host.
|
|
*/
|
|
static struct nlm_host *
|
|
nlm_create_host(const char* caller_name)
|
|
{
|
|
struct nlm_host *host;
|
|
struct sysctl_oid *oid;
|
|
|
|
mtx_assert(&nlm_global_lock, MA_OWNED);
|
|
|
|
NLM_DEBUG(1, "NLM: new host %s (sysid %d)\n",
|
|
caller_name, nlm_next_sysid);
|
|
host = malloc(sizeof(struct nlm_host), M_NLM, M_NOWAIT|M_ZERO);
|
|
if (!host)
|
|
return (NULL);
|
|
mtx_init(&host->nh_lock, "nh_lock", NULL, MTX_DEF);
|
|
refcount_init(&host->nh_refs, 1);
|
|
strlcpy(host->nh_caller_name, caller_name, MAXNAMELEN);
|
|
host->nh_sysid = nlm_next_sysid++;
|
|
snprintf(host->nh_sysid_string, sizeof(host->nh_sysid_string),
|
|
"%d", host->nh_sysid);
|
|
host->nh_vers = 0;
|
|
host->nh_state = 0;
|
|
host->nh_monstate = NLM_UNMONITORED;
|
|
host->nh_grantcookie = 1;
|
|
TAILQ_INIT(&host->nh_pending);
|
|
TAILQ_INIT(&host->nh_granted);
|
|
TAILQ_INIT(&host->nh_finished);
|
|
TAILQ_INSERT_TAIL(&nlm_hosts, host, nh_link);
|
|
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
sysctl_ctx_init(&host->nh_sysctl);
|
|
oid = SYSCTL_ADD_NODE(&host->nh_sysctl,
|
|
SYSCTL_STATIC_CHILDREN(_vfs_nlm_sysid),
|
|
OID_AUTO, host->nh_sysid_string, CTLFLAG_RD | CTLFLAG_MPSAFE,
|
|
NULL, "");
|
|
SYSCTL_ADD_STRING(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
|
|
"hostname", CTLFLAG_RD, host->nh_caller_name, 0, "");
|
|
SYSCTL_ADD_UINT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
|
|
"version", CTLFLAG_RD, &host->nh_vers, 0, "");
|
|
SYSCTL_ADD_UINT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
|
|
"monitored", CTLFLAG_RD, &host->nh_monstate, 0, "");
|
|
SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
|
|
"lock_count", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, host,
|
|
0, nlm_host_lock_count_sysctl, "I", "");
|
|
SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
|
|
"client_lock_count", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
|
|
host, 0, nlm_host_client_lock_count_sysctl, "I", "");
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
|
|
return (host);
|
|
}
|
|
|
|
/*
|
|
* Acquire the next sysid for remote locks not handled by the NLM.
|
|
*/
|
|
uint32_t
|
|
nlm_acquire_next_sysid(void)
|
|
{
|
|
uint32_t next_sysid;
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
next_sysid = nlm_next_sysid++;
|
|
mtx_unlock(&nlm_global_lock);
|
|
return (next_sysid);
|
|
}
|
|
|
|
/*
|
|
* Return non-zero if the address parts of the two sockaddrs are the
|
|
* same.
|
|
*/
|
|
static int
|
|
nlm_compare_addr(const struct sockaddr *a, const struct sockaddr *b)
|
|
{
|
|
const struct sockaddr_in *a4, *b4;
|
|
#ifdef INET6
|
|
const struct sockaddr_in6 *a6, *b6;
|
|
#endif
|
|
|
|
if (a->sa_family != b->sa_family)
|
|
return (FALSE);
|
|
|
|
switch (a->sa_family) {
|
|
case AF_INET:
|
|
a4 = (const struct sockaddr_in *) a;
|
|
b4 = (const struct sockaddr_in *) b;
|
|
return !memcmp(&a4->sin_addr, &b4->sin_addr,
|
|
sizeof(a4->sin_addr));
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
a6 = (const struct sockaddr_in6 *) a;
|
|
b6 = (const struct sockaddr_in6 *) b;
|
|
return !memcmp(&a6->sin6_addr, &b6->sin6_addr,
|
|
sizeof(a6->sin6_addr));
|
|
#endif
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check for idle hosts and stop monitoring them. We could also free
|
|
* the host structure here, possibly after a larger timeout but that
|
|
* would require some care to avoid races with
|
|
* e.g. nlm_host_lock_count_sysctl.
|
|
*/
|
|
static void
|
|
nlm_check_idle(void)
|
|
{
|
|
struct nlm_host *host;
|
|
|
|
mtx_assert(&nlm_global_lock, MA_OWNED);
|
|
|
|
if (time_uptime <= nlm_next_idle_check)
|
|
return;
|
|
|
|
nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD;
|
|
|
|
TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
|
|
if (host->nh_monstate == NLM_MONITORED
|
|
&& time_uptime > host->nh_idle_timeout) {
|
|
mtx_unlock(&nlm_global_lock);
|
|
if (lf_countlocks(host->nh_sysid) > 0
|
|
|| lf_countlocks(NLM_SYSID_CLIENT
|
|
+ host->nh_sysid)) {
|
|
host->nh_idle_timeout =
|
|
time_uptime + NLM_IDLE_TIMEOUT;
|
|
mtx_lock(&nlm_global_lock);
|
|
continue;
|
|
}
|
|
nlm_host_unmonitor(host);
|
|
mtx_lock(&nlm_global_lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Search for an existing NLM host that matches the given name
|
|
* (typically the caller_name element of an nlm4_lock). If none is
|
|
* found, create a new host. If 'addr' is non-NULL, record the remote
|
|
* address of the host so that we can call it back for async
|
|
* responses. If 'vers' is greater than zero then record the NLM
|
|
* program version to use to communicate with this client.
|
|
*/
|
|
struct nlm_host *
|
|
nlm_find_host_by_name(const char *name, const struct sockaddr *addr,
|
|
rpcvers_t vers)
|
|
{
|
|
struct nlm_host *host;
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
|
|
/*
|
|
* The remote host is determined by caller_name.
|
|
*/
|
|
TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
|
|
if (!strcmp(host->nh_caller_name, name))
|
|
break;
|
|
}
|
|
|
|
if (!host) {
|
|
host = nlm_create_host(name);
|
|
if (!host) {
|
|
mtx_unlock(&nlm_global_lock);
|
|
return (NULL);
|
|
}
|
|
}
|
|
refcount_acquire(&host->nh_refs);
|
|
|
|
host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT;
|
|
|
|
/*
|
|
* If we have an address for the host, record it so that we
|
|
* can send async replies etc.
|
|
*/
|
|
if (addr) {
|
|
|
|
KASSERT(addr->sa_len < sizeof(struct sockaddr_storage),
|
|
("Strange remote transport address length"));
|
|
|
|
/*
|
|
* If we have seen an address before and we currently
|
|
* have an RPC client handle, make sure the address is
|
|
* the same, otherwise discard the client handle.
|
|
*/
|
|
if (host->nh_addr.ss_len && host->nh_srvrpc.nr_client) {
|
|
if (!nlm_compare_addr(
|
|
(struct sockaddr *) &host->nh_addr,
|
|
addr)
|
|
|| host->nh_vers != vers) {
|
|
CLIENT *client;
|
|
mtx_lock(&host->nh_lock);
|
|
client = host->nh_srvrpc.nr_client;
|
|
host->nh_srvrpc.nr_client = NULL;
|
|
mtx_unlock(&host->nh_lock);
|
|
if (client) {
|
|
CLNT_RELEASE(client);
|
|
}
|
|
}
|
|
}
|
|
memcpy(&host->nh_addr, addr, addr->sa_len);
|
|
host->nh_vers = vers;
|
|
}
|
|
|
|
nlm_check_idle();
|
|
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
return (host);
|
|
}
|
|
|
|
/*
|
|
* Search for an existing NLM host that matches the given remote
|
|
* address. If none is found, create a new host with the requested
|
|
* address and remember 'vers' as the NLM protocol version to use for
|
|
* that host.
|
|
*/
|
|
struct nlm_host *
|
|
nlm_find_host_by_addr(const struct sockaddr *addr, int vers)
|
|
{
|
|
/*
|
|
* Fake up a name using inet_ntop. This buffer is
|
|
* large enough for an IPv6 address.
|
|
*/
|
|
char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
|
|
struct nlm_host *host;
|
|
|
|
switch (addr->sa_family) {
|
|
case AF_INET:
|
|
inet_ntop(AF_INET,
|
|
&((const struct sockaddr_in *) addr)->sin_addr,
|
|
tmp, sizeof tmp);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
inet_ntop(AF_INET6,
|
|
&((const struct sockaddr_in6 *) addr)->sin6_addr,
|
|
tmp, sizeof tmp);
|
|
break;
|
|
#endif
|
|
default:
|
|
strlcpy(tmp, "<unknown>", sizeof(tmp));
|
|
}
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
|
|
/*
|
|
* The remote host is determined by caller_name.
|
|
*/
|
|
TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
|
|
if (nlm_compare_addr(addr,
|
|
(const struct sockaddr *) &host->nh_addr))
|
|
break;
|
|
}
|
|
|
|
if (!host) {
|
|
host = nlm_create_host(tmp);
|
|
if (!host) {
|
|
mtx_unlock(&nlm_global_lock);
|
|
return (NULL);
|
|
}
|
|
memcpy(&host->nh_addr, addr, addr->sa_len);
|
|
host->nh_vers = vers;
|
|
}
|
|
refcount_acquire(&host->nh_refs);
|
|
|
|
host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT;
|
|
|
|
nlm_check_idle();
|
|
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
return (host);
|
|
}
|
|
|
|
/*
|
|
* Find the NLM host that matches the value of 'sysid'. If none
|
|
* exists, return NULL.
|
|
*/
|
|
static struct nlm_host *
|
|
nlm_find_host_by_sysid(int sysid)
|
|
{
|
|
struct nlm_host *host;
|
|
|
|
TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
|
|
if (host->nh_sysid == sysid) {
|
|
refcount_acquire(&host->nh_refs);
|
|
return (host);
|
|
}
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
void nlm_host_release(struct nlm_host *host)
|
|
{
|
|
if (refcount_release(&host->nh_refs)) {
|
|
/*
|
|
* Free the host
|
|
*/
|
|
nlm_host_destroy(host);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unregister this NLM host with the local NSM due to idleness.
|
|
*/
|
|
static void
|
|
nlm_host_unmonitor(struct nlm_host *host)
|
|
{
|
|
mon_id smmonid;
|
|
sm_stat_res smstat;
|
|
struct timeval timo;
|
|
enum clnt_stat stat;
|
|
|
|
NLM_DEBUG(1, "NLM: unmonitoring %s (sysid %d)\n",
|
|
host->nh_caller_name, host->nh_sysid);
|
|
|
|
/*
|
|
* We put our assigned system ID value in the priv field to
|
|
* make it simpler to find the host if we are notified of a
|
|
* host restart.
|
|
*/
|
|
smmonid.mon_name = host->nh_caller_name;
|
|
smmonid.my_id.my_name = "localhost";
|
|
smmonid.my_id.my_prog = NLM_PROG;
|
|
smmonid.my_id.my_vers = NLM_SM;
|
|
smmonid.my_id.my_proc = NLM_SM_NOTIFY;
|
|
|
|
timo.tv_sec = 25;
|
|
timo.tv_usec = 0;
|
|
stat = CLNT_CALL(nlm_nsm, SM_UNMON,
|
|
(xdrproc_t) xdr_mon, &smmonid,
|
|
(xdrproc_t) xdr_sm_stat, &smstat, timo);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
NLM_ERR("Failed to contact local NSM - rpc error %d\n", stat);
|
|
return;
|
|
}
|
|
if (smstat.res_stat == stat_fail) {
|
|
NLM_ERR("Local NSM refuses to unmonitor %s\n",
|
|
host->nh_caller_name);
|
|
return;
|
|
}
|
|
|
|
host->nh_monstate = NLM_UNMONITORED;
|
|
}
|
|
|
|
/*
|
|
* Register this NLM host with the local NSM so that we can be
|
|
* notified if it reboots.
|
|
*/
|
|
void
|
|
nlm_host_monitor(struct nlm_host *host, int state)
|
|
{
|
|
mon smmon;
|
|
sm_stat_res smstat;
|
|
struct timeval timo;
|
|
enum clnt_stat stat;
|
|
|
|
if (state && !host->nh_state) {
|
|
/*
|
|
* This is the first time we have seen an NSM state
|
|
* value for this host. We record it here to help
|
|
* detect host reboots.
|
|
*/
|
|
host->nh_state = state;
|
|
NLM_DEBUG(1, "NLM: host %s (sysid %d) has NSM state %d\n",
|
|
host->nh_caller_name, host->nh_sysid, state);
|
|
}
|
|
|
|
mtx_lock(&host->nh_lock);
|
|
if (host->nh_monstate != NLM_UNMONITORED) {
|
|
mtx_unlock(&host->nh_lock);
|
|
return;
|
|
}
|
|
host->nh_monstate = NLM_MONITORED;
|
|
mtx_unlock(&host->nh_lock);
|
|
|
|
NLM_DEBUG(1, "NLM: monitoring %s (sysid %d)\n",
|
|
host->nh_caller_name, host->nh_sysid);
|
|
|
|
/*
|
|
* We put our assigned system ID value in the priv field to
|
|
* make it simpler to find the host if we are notified of a
|
|
* host restart.
|
|
*/
|
|
smmon.mon_id.mon_name = host->nh_caller_name;
|
|
smmon.mon_id.my_id.my_name = "localhost";
|
|
smmon.mon_id.my_id.my_prog = NLM_PROG;
|
|
smmon.mon_id.my_id.my_vers = NLM_SM;
|
|
smmon.mon_id.my_id.my_proc = NLM_SM_NOTIFY;
|
|
memcpy(smmon.priv, &host->nh_sysid, sizeof(host->nh_sysid));
|
|
|
|
timo.tv_sec = 25;
|
|
timo.tv_usec = 0;
|
|
stat = CLNT_CALL(nlm_nsm, SM_MON,
|
|
(xdrproc_t) xdr_mon, &smmon,
|
|
(xdrproc_t) xdr_sm_stat, &smstat, timo);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
NLM_ERR("Failed to contact local NSM - rpc error %d\n", stat);
|
|
return;
|
|
}
|
|
if (smstat.res_stat == stat_fail) {
|
|
NLM_ERR("Local NSM refuses to monitor %s\n",
|
|
host->nh_caller_name);
|
|
mtx_lock(&host->nh_lock);
|
|
host->nh_monstate = NLM_MONITOR_FAILED;
|
|
mtx_unlock(&host->nh_lock);
|
|
return;
|
|
}
|
|
|
|
host->nh_monstate = NLM_MONITORED;
|
|
}
|
|
|
|
/*
|
|
* Return an RPC client handle that can be used to talk to the NLM
|
|
* running on the given host.
|
|
*/
|
|
CLIENT *
|
|
nlm_host_get_rpc(struct nlm_host *host, bool_t isserver)
|
|
{
|
|
struct nlm_rpc *rpc;
|
|
CLIENT *client;
|
|
|
|
mtx_lock(&host->nh_lock);
|
|
|
|
if (isserver)
|
|
rpc = &host->nh_srvrpc;
|
|
else
|
|
rpc = &host->nh_clntrpc;
|
|
|
|
/*
|
|
* We can't hold onto RPC handles for too long - the async
|
|
* call/reply protocol used by some NLM clients makes it hard
|
|
* to tell when they change port numbers (e.g. after a
|
|
* reboot). Note that if a client reboots while it isn't
|
|
* holding any locks, it won't bother to notify us. We
|
|
* expire the RPC handles after two minutes.
|
|
*/
|
|
if (rpc->nr_client && time_uptime > rpc->nr_create_time + 2*60) {
|
|
client = rpc->nr_client;
|
|
rpc->nr_client = NULL;
|
|
mtx_unlock(&host->nh_lock);
|
|
CLNT_RELEASE(client);
|
|
mtx_lock(&host->nh_lock);
|
|
}
|
|
|
|
if (!rpc->nr_client) {
|
|
mtx_unlock(&host->nh_lock);
|
|
client = nlm_get_rpc((struct sockaddr *)&host->nh_addr,
|
|
NLM_PROG, host->nh_vers);
|
|
mtx_lock(&host->nh_lock);
|
|
|
|
if (client) {
|
|
if (rpc->nr_client) {
|
|
mtx_unlock(&host->nh_lock);
|
|
CLNT_DESTROY(client);
|
|
mtx_lock(&host->nh_lock);
|
|
} else {
|
|
rpc->nr_client = client;
|
|
rpc->nr_create_time = time_uptime;
|
|
}
|
|
}
|
|
}
|
|
|
|
client = rpc->nr_client;
|
|
if (client)
|
|
CLNT_ACQUIRE(client);
|
|
mtx_unlock(&host->nh_lock);
|
|
|
|
return (client);
|
|
|
|
}
|
|
|
|
int nlm_host_get_sysid(struct nlm_host *host)
|
|
{
|
|
|
|
return (host->nh_sysid);
|
|
}
|
|
|
|
int
|
|
nlm_host_get_state(struct nlm_host *host)
|
|
{
|
|
|
|
return (host->nh_state);
|
|
}
|
|
|
|
void *
|
|
nlm_register_wait_lock(struct nlm4_lock *lock, struct vnode *vp)
|
|
{
|
|
struct nlm_waiting_lock *nw;
|
|
|
|
nw = malloc(sizeof(struct nlm_waiting_lock), M_NLM, M_WAITOK);
|
|
nw->nw_lock = *lock;
|
|
memcpy(&nw->nw_fh.fh_bytes, nw->nw_lock.fh.n_bytes,
|
|
nw->nw_lock.fh.n_len);
|
|
nw->nw_lock.fh.n_bytes = nw->nw_fh.fh_bytes;
|
|
nw->nw_waiting = TRUE;
|
|
nw->nw_vp = vp;
|
|
mtx_lock(&nlm_global_lock);
|
|
TAILQ_INSERT_TAIL(&nlm_waiting_locks, nw, nw_link);
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
return nw;
|
|
}
|
|
|
|
void
|
|
nlm_deregister_wait_lock(void *handle)
|
|
{
|
|
struct nlm_waiting_lock *nw = handle;
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link);
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
free(nw, M_NLM);
|
|
}
|
|
|
|
int
|
|
nlm_wait_lock(void *handle, int timo)
|
|
{
|
|
struct nlm_waiting_lock *nw = handle;
|
|
int error, stops_deferred;
|
|
|
|
/*
|
|
* If the granted message arrived before we got here,
|
|
* nw->nw_waiting will be FALSE - in that case, don't sleep.
|
|
*/
|
|
mtx_lock(&nlm_global_lock);
|
|
error = 0;
|
|
if (nw->nw_waiting) {
|
|
stops_deferred = sigdeferstop(SIGDEFERSTOP_ERESTART);
|
|
error = msleep(nw, &nlm_global_lock, PCATCH, "nlmlock", timo);
|
|
sigallowstop(stops_deferred);
|
|
}
|
|
TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link);
|
|
if (error) {
|
|
/*
|
|
* The granted message may arrive after the
|
|
* interrupt/timeout but before we manage to lock the
|
|
* mutex. Detect this by examining nw_lock.
|
|
*/
|
|
if (!nw->nw_waiting)
|
|
error = 0;
|
|
} else {
|
|
/*
|
|
* If nlm_cancel_wait is called, then error will be
|
|
* zero but nw_waiting will still be TRUE. We
|
|
* translate this into EINTR.
|
|
*/
|
|
if (nw->nw_waiting)
|
|
error = EINTR;
|
|
}
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
free(nw, M_NLM);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
nlm_cancel_wait(struct vnode *vp)
|
|
{
|
|
struct nlm_waiting_lock *nw;
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) {
|
|
if (nw->nw_vp == vp) {
|
|
wakeup(nw);
|
|
}
|
|
}
|
|
mtx_unlock(&nlm_global_lock);
|
|
}
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* Syscall interface with userland.
|
|
*/
|
|
|
|
extern void nlm_prog_0(struct svc_req *rqstp, SVCXPRT *transp);
|
|
extern void nlm_prog_1(struct svc_req *rqstp, SVCXPRT *transp);
|
|
extern void nlm_prog_3(struct svc_req *rqstp, SVCXPRT *transp);
|
|
extern void nlm_prog_4(struct svc_req *rqstp, SVCXPRT *transp);
|
|
|
|
static int
|
|
nlm_register_services(SVCPOOL *pool, int addr_count, char **addrs)
|
|
{
|
|
static rpcvers_t versions[] = {
|
|
NLM_SM, NLM_VERS, NLM_VERSX, NLM_VERS4
|
|
};
|
|
static void (*dispatchers[])(struct svc_req *, SVCXPRT *) = {
|
|
nlm_prog_0, nlm_prog_1, nlm_prog_3, nlm_prog_4
|
|
};
|
|
|
|
SVCXPRT **xprts;
|
|
char netid[16];
|
|
char uaddr[128];
|
|
struct netconfig *nconf;
|
|
int i, j, error;
|
|
|
|
if (!addr_count) {
|
|
NLM_ERR("NLM: no service addresses given - can't start server");
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (addr_count < 0 || addr_count > 256 ) {
|
|
NLM_ERR("NLM: too many service addresses (%d) given, "
|
|
"max 256 - can't start server\n", addr_count);
|
|
return (EINVAL);
|
|
}
|
|
|
|
xprts = malloc(addr_count * sizeof(SVCXPRT *), M_NLM, M_WAITOK|M_ZERO);
|
|
for (i = 0; i < nitems(versions); i++) {
|
|
for (j = 0; j < addr_count; j++) {
|
|
/*
|
|
* Create transports for the first version and
|
|
* then just register everything else to the
|
|
* same transports.
|
|
*/
|
|
if (i == 0) {
|
|
char *up;
|
|
|
|
error = copyin(&addrs[2*j], &up,
|
|
sizeof(char*));
|
|
if (error)
|
|
goto out;
|
|
error = copyinstr(up, netid, sizeof(netid),
|
|
NULL);
|
|
if (error)
|
|
goto out;
|
|
error = copyin(&addrs[2*j+1], &up,
|
|
sizeof(char*));
|
|
if (error)
|
|
goto out;
|
|
error = copyinstr(up, uaddr, sizeof(uaddr),
|
|
NULL);
|
|
if (error)
|
|
goto out;
|
|
nconf = getnetconfigent(netid);
|
|
if (!nconf) {
|
|
NLM_ERR("Can't lookup netid %s\n",
|
|
netid);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
xprts[j] = svc_tp_create(pool, dispatchers[i],
|
|
NLM_PROG, versions[i], uaddr, nconf);
|
|
if (!xprts[j]) {
|
|
NLM_ERR("NLM: unable to create "
|
|
"(NLM_PROG, %d).\n", versions[i]);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
freenetconfigent(nconf);
|
|
} else {
|
|
nconf = getnetconfigent(xprts[j]->xp_netid);
|
|
rpcb_unset(NLM_PROG, versions[i], nconf);
|
|
if (!svc_reg(xprts[j], NLM_PROG, versions[i],
|
|
dispatchers[i], nconf)) {
|
|
NLM_ERR("NLM: can't register "
|
|
"(NLM_PROG, %d)\n", versions[i]);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
error = 0;
|
|
out:
|
|
for (j = 0; j < addr_count; j++) {
|
|
if (xprts[j])
|
|
SVC_RELEASE(xprts[j]);
|
|
}
|
|
free(xprts, M_NLM);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Main server entry point. Contacts the local NSM to get its current
|
|
* state and send SM_UNMON_ALL. Registers the NLM services and then
|
|
* services requests. Does not return until the server is interrupted
|
|
* by a signal.
|
|
*/
|
|
static int
|
|
nlm_server_main(int addr_count, char **addrs)
|
|
{
|
|
struct thread *td = curthread;
|
|
int error;
|
|
SVCPOOL *pool = NULL;
|
|
struct sockopt opt;
|
|
int portlow;
|
|
#ifdef INET6
|
|
struct sockaddr_in6 sin6;
|
|
#endif
|
|
struct sockaddr_in sin;
|
|
my_id id;
|
|
sm_stat smstat;
|
|
struct timeval timo;
|
|
enum clnt_stat stat;
|
|
struct nlm_host *host, *nhost;
|
|
struct nlm_waiting_lock *nw;
|
|
vop_advlock_t *old_nfs_advlock;
|
|
vop_reclaim_t *old_nfs_reclaim;
|
|
|
|
if (nlm_is_running != 0) {
|
|
NLM_ERR("NLM: can't start server - "
|
|
"it appears to be running already\n");
|
|
return (EPERM);
|
|
}
|
|
|
|
if (nlm_socket == NULL) {
|
|
memset(&opt, 0, sizeof(opt));
|
|
|
|
error = socreate(AF_INET, &nlm_socket, SOCK_DGRAM, 0,
|
|
td->td_ucred, td);
|
|
if (error) {
|
|
NLM_ERR("NLM: can't create IPv4 socket - error %d\n",
|
|
error);
|
|
return (error);
|
|
}
|
|
opt.sopt_dir = SOPT_SET;
|
|
opt.sopt_level = IPPROTO_IP;
|
|
opt.sopt_name = IP_PORTRANGE;
|
|
portlow = IP_PORTRANGE_LOW;
|
|
opt.sopt_val = &portlow;
|
|
opt.sopt_valsize = sizeof(portlow);
|
|
sosetopt(nlm_socket, &opt);
|
|
|
|
#ifdef INET6
|
|
nlm_socket6 = NULL;
|
|
error = socreate(AF_INET6, &nlm_socket6, SOCK_DGRAM, 0,
|
|
td->td_ucred, td);
|
|
if (error) {
|
|
NLM_ERR("NLM: can't create IPv6 socket - error %d\n",
|
|
error);
|
|
soclose(nlm_socket);
|
|
nlm_socket = NULL;
|
|
return (error);
|
|
}
|
|
opt.sopt_dir = SOPT_SET;
|
|
opt.sopt_level = IPPROTO_IPV6;
|
|
opt.sopt_name = IPV6_PORTRANGE;
|
|
portlow = IPV6_PORTRANGE_LOW;
|
|
opt.sopt_val = &portlow;
|
|
opt.sopt_valsize = sizeof(portlow);
|
|
sosetopt(nlm_socket6, &opt);
|
|
#endif
|
|
}
|
|
|
|
nlm_auth = authunix_create(curthread->td_ucred);
|
|
|
|
#ifdef INET6
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_len = sizeof(sin6);
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_addr = in6addr_loopback;
|
|
nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin6, SM_PROG, SM_VERS);
|
|
if (!nlm_nsm) {
|
|
#endif
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_len = sizeof(sin);
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
|
nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin, SM_PROG,
|
|
SM_VERS);
|
|
#ifdef INET6
|
|
}
|
|
#endif
|
|
|
|
if (!nlm_nsm) {
|
|
NLM_ERR("Can't start NLM - unable to contact NSM\n");
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
pool = svcpool_create("NLM", NULL);
|
|
|
|
error = nlm_register_services(pool, addr_count, addrs);
|
|
if (error)
|
|
goto out;
|
|
|
|
memset(&id, 0, sizeof(id));
|
|
id.my_name = "NFS NLM";
|
|
|
|
timo.tv_sec = 25;
|
|
timo.tv_usec = 0;
|
|
stat = CLNT_CALL(nlm_nsm, SM_UNMON_ALL,
|
|
(xdrproc_t) xdr_my_id, &id,
|
|
(xdrproc_t) xdr_sm_stat, &smstat, timo);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
struct rpc_err err;
|
|
|
|
CLNT_GETERR(nlm_nsm, &err);
|
|
NLM_ERR("NLM: unexpected error contacting NSM, "
|
|
"stat=%d, errno=%d\n", stat, err.re_errno);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
nlm_is_running = 1;
|
|
|
|
NLM_DEBUG(1, "NLM: local NSM state is %d\n", smstat.state);
|
|
nlm_nsm_state = smstat.state;
|
|
|
|
old_nfs_advlock = nfs_advlock_p;
|
|
nfs_advlock_p = nlm_advlock;
|
|
old_nfs_reclaim = nfs_reclaim_p;
|
|
nfs_reclaim_p = nlm_reclaim;
|
|
|
|
svc_run(pool);
|
|
error = 0;
|
|
|
|
nfs_advlock_p = old_nfs_advlock;
|
|
nfs_reclaim_p = old_nfs_reclaim;
|
|
|
|
out:
|
|
nlm_is_running = 0;
|
|
if (pool)
|
|
svcpool_destroy(pool);
|
|
|
|
/*
|
|
* We are finished communicating with the NSM.
|
|
*/
|
|
if (nlm_nsm) {
|
|
CLNT_RELEASE(nlm_nsm);
|
|
nlm_nsm = NULL;
|
|
}
|
|
|
|
/*
|
|
* Trash all the existing state so that if the server
|
|
* restarts, it gets a clean slate. This is complicated by the
|
|
* possibility that there may be other threads trying to make
|
|
* client locking requests.
|
|
*
|
|
* First we fake a client reboot notification which will
|
|
* cancel any pending async locks and purge remote lock state
|
|
* from the local lock manager. We release the reference from
|
|
* nlm_hosts to the host (which may remove it from the list
|
|
* and free it). After this phase, the only entries in the
|
|
* nlm_host list should be from other threads performing
|
|
* client lock requests.
|
|
*/
|
|
mtx_lock(&nlm_global_lock);
|
|
TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) {
|
|
wakeup(nw);
|
|
}
|
|
TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, nhost) {
|
|
mtx_unlock(&nlm_global_lock);
|
|
nlm_host_notify(host, 0);
|
|
nlm_host_release(host);
|
|
mtx_lock(&nlm_global_lock);
|
|
}
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
AUTH_DESTROY(nlm_auth);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sys_nlm_syscall(struct thread *td, struct nlm_syscall_args *uap)
|
|
{
|
|
int error;
|
|
|
|
error = priv_check(td, PRIV_NFS_LOCKD);
|
|
if (error)
|
|
return (error);
|
|
|
|
nlm_debug_level = uap->debug_level;
|
|
nlm_grace_threshold = time_uptime + uap->grace_period;
|
|
nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD;
|
|
|
|
return nlm_server_main(uap->addr_count, uap->addrs);
|
|
}
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* NLM implementation details, called from the RPC stubs.
|
|
*/
|
|
|
|
void
|
|
nlm_sm_notify(struct nlm_sm_status *argp)
|
|
{
|
|
uint32_t sysid;
|
|
struct nlm_host *host;
|
|
|
|
NLM_DEBUG(3, "nlm_sm_notify(): mon_name = %s\n", argp->mon_name);
|
|
memcpy(&sysid, &argp->priv, sizeof(sysid));
|
|
host = nlm_find_host_by_sysid(sysid);
|
|
if (host) {
|
|
nlm_host_notify(host, argp->state);
|
|
nlm_host_release(host);
|
|
}
|
|
}
|
|
|
|
static void
|
|
nlm_convert_to_fhandle_t(fhandle_t *fhp, struct netobj *p)
|
|
{
|
|
memcpy(fhp, p->n_bytes, sizeof(fhandle_t));
|
|
}
|
|
|
|
struct vfs_state {
|
|
struct mount *vs_mp;
|
|
struct vnode *vs_vp;
|
|
int vs_vnlocked;
|
|
};
|
|
|
|
static int
|
|
nlm_get_vfs_state(struct nlm_host *host, struct svc_req *rqstp,
|
|
fhandle_t *fhp, struct vfs_state *vs, accmode_t accmode)
|
|
{
|
|
int error;
|
|
uint64_t exflags;
|
|
struct ucred *cred = NULL, *credanon = NULL;
|
|
|
|
memset(vs, 0, sizeof(*vs));
|
|
|
|
vs->vs_mp = vfs_getvfs(&fhp->fh_fsid);
|
|
if (!vs->vs_mp) {
|
|
return (ESTALE);
|
|
}
|
|
|
|
/* accmode == 0 means don't check, since it is an unlock. */
|
|
if (accmode != 0) {
|
|
error = VFS_CHECKEXP(vs->vs_mp,
|
|
(struct sockaddr *)&host->nh_addr, &exflags, &credanon,
|
|
NULL, NULL);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (exflags & MNT_EXRDONLY ||
|
|
(vs->vs_mp->mnt_flag & MNT_RDONLY)) {
|
|
error = EROFS;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
error = VFS_FHTOVP(vs->vs_mp, &fhp->fh_fid, LK_EXCLUSIVE, &vs->vs_vp);
|
|
if (error)
|
|
goto out;
|
|
vs->vs_vnlocked = TRUE;
|
|
|
|
if (accmode != 0) {
|
|
if (!svc_getcred(rqstp, &cred, NULL)) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) {
|
|
crfree(cred);
|
|
cred = credanon;
|
|
credanon = NULL;
|
|
}
|
|
|
|
/*
|
|
* Check cred.
|
|
*/
|
|
error = VOP_ACCESS(vs->vs_vp, accmode, cred, curthread);
|
|
/*
|
|
* If this failed and accmode != VWRITE, try again with
|
|
* VWRITE to maintain backwards compatibility with the
|
|
* old code that always used VWRITE.
|
|
*/
|
|
if (error != 0 && accmode != VWRITE)
|
|
error = VOP_ACCESS(vs->vs_vp, VWRITE, cred, curthread);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
VOP_UNLOCK(vs->vs_vp);
|
|
vs->vs_vnlocked = FALSE;
|
|
|
|
out:
|
|
if (cred)
|
|
crfree(cred);
|
|
if (credanon)
|
|
crfree(credanon);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
nlm_release_vfs_state(struct vfs_state *vs)
|
|
{
|
|
|
|
if (vs->vs_vp) {
|
|
if (vs->vs_vnlocked)
|
|
vput(vs->vs_vp);
|
|
else
|
|
vrele(vs->vs_vp);
|
|
}
|
|
if (vs->vs_mp)
|
|
vfs_rel(vs->vs_mp);
|
|
}
|
|
|
|
static nlm4_stats
|
|
nlm_convert_error(int error)
|
|
{
|
|
|
|
if (error == ESTALE)
|
|
return nlm4_stale_fh;
|
|
else if (error == EROFS)
|
|
return nlm4_rofs;
|
|
else
|
|
return nlm4_failed;
|
|
}
|
|
|
|
int
|
|
nlm_do_test(nlm4_testargs *argp, nlm4_testres *result, struct svc_req *rqstp,
|
|
CLIENT **rpcp)
|
|
{
|
|
fhandle_t fh;
|
|
struct vfs_state vs;
|
|
struct nlm_host *host, *bhost;
|
|
int error, sysid;
|
|
struct flock fl;
|
|
accmode_t accmode;
|
|
|
|
memset(result, 0, sizeof(*result));
|
|
memset(&vs, 0, sizeof(vs));
|
|
|
|
host = nlm_find_host_by_name(argp->alock.caller_name,
|
|
svc_getrpccaller(rqstp), rqstp->rq_vers);
|
|
if (!host) {
|
|
result->stat.stat = nlm4_denied_nolocks;
|
|
return (ENOMEM);
|
|
}
|
|
|
|
NLM_DEBUG(3, "nlm_do_test(): caller_name = %s (sysid = %d)\n",
|
|
host->nh_caller_name, host->nh_sysid);
|
|
|
|
nlm_check_expired_locks(host);
|
|
sysid = host->nh_sysid;
|
|
|
|
nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
|
|
nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
|
|
|
|
if (time_uptime < nlm_grace_threshold) {
|
|
result->stat.stat = nlm4_denied_grace_period;
|
|
goto out;
|
|
}
|
|
|
|
accmode = argp->exclusive ? VWRITE : VREAD;
|
|
error = nlm_get_vfs_state(host, rqstp, &fh, &vs, accmode);
|
|
if (error) {
|
|
result->stat.stat = nlm_convert_error(error);
|
|
goto out;
|
|
}
|
|
|
|
fl.l_start = argp->alock.l_offset;
|
|
fl.l_len = argp->alock.l_len;
|
|
fl.l_pid = argp->alock.svid;
|
|
fl.l_sysid = sysid;
|
|
fl.l_whence = SEEK_SET;
|
|
if (argp->exclusive)
|
|
fl.l_type = F_WRLCK;
|
|
else
|
|
fl.l_type = F_RDLCK;
|
|
error = VOP_ADVLOCK(vs.vs_vp, NULL, F_GETLK, &fl, F_REMOTE);
|
|
if (error) {
|
|
result->stat.stat = nlm4_failed;
|
|
goto out;
|
|
}
|
|
|
|
if (fl.l_type == F_UNLCK) {
|
|
result->stat.stat = nlm4_granted;
|
|
} else {
|
|
result->stat.stat = nlm4_denied;
|
|
result->stat.nlm4_testrply_u.holder.exclusive =
|
|
(fl.l_type == F_WRLCK);
|
|
result->stat.nlm4_testrply_u.holder.svid = fl.l_pid;
|
|
bhost = nlm_find_host_by_sysid(fl.l_sysid);
|
|
if (bhost) {
|
|
/*
|
|
* We don't have any useful way of recording
|
|
* the value of oh used in the original lock
|
|
* request. Ideally, the test reply would have
|
|
* a space for the owning host's name allowing
|
|
* our caller's NLM to keep track.
|
|
*
|
|
* As far as I can see, Solaris uses an eight
|
|
* byte structure for oh which contains a four
|
|
* byte pid encoded in local byte order and
|
|
* the first four bytes of the host
|
|
* name. Linux uses a variable length string
|
|
* 'pid@hostname' in ascii but doesn't even
|
|
* return that in test replies.
|
|
*
|
|
* For the moment, return nothing in oh
|
|
* (already zero'ed above).
|
|
*/
|
|
nlm_host_release(bhost);
|
|
}
|
|
result->stat.nlm4_testrply_u.holder.l_offset = fl.l_start;
|
|
result->stat.nlm4_testrply_u.holder.l_len = fl.l_len;
|
|
}
|
|
|
|
out:
|
|
nlm_release_vfs_state(&vs);
|
|
if (rpcp)
|
|
*rpcp = nlm_host_get_rpc(host, TRUE);
|
|
nlm_host_release(host);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlm_do_lock(nlm4_lockargs *argp, nlm4_res *result, struct svc_req *rqstp,
|
|
bool_t monitor, CLIENT **rpcp)
|
|
{
|
|
fhandle_t fh;
|
|
struct vfs_state vs;
|
|
struct nlm_host *host;
|
|
int error, sysid;
|
|
struct flock fl;
|
|
accmode_t accmode;
|
|
|
|
memset(result, 0, sizeof(*result));
|
|
memset(&vs, 0, sizeof(vs));
|
|
|
|
host = nlm_find_host_by_name(argp->alock.caller_name,
|
|
svc_getrpccaller(rqstp), rqstp->rq_vers);
|
|
if (!host) {
|
|
result->stat.stat = nlm4_denied_nolocks;
|
|
return (ENOMEM);
|
|
}
|
|
|
|
NLM_DEBUG(3, "nlm_do_lock(): caller_name = %s (sysid = %d)\n",
|
|
host->nh_caller_name, host->nh_sysid);
|
|
|
|
if (monitor && host->nh_state && argp->state
|
|
&& host->nh_state != argp->state) {
|
|
/*
|
|
* The host rebooted without telling us. Trash its
|
|
* locks.
|
|
*/
|
|
nlm_host_notify(host, argp->state);
|
|
}
|
|
|
|
nlm_check_expired_locks(host);
|
|
sysid = host->nh_sysid;
|
|
|
|
nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
|
|
nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
|
|
|
|
if (time_uptime < nlm_grace_threshold && !argp->reclaim) {
|
|
result->stat.stat = nlm4_denied_grace_period;
|
|
goto out;
|
|
}
|
|
|
|
accmode = argp->exclusive ? VWRITE : VREAD;
|
|
error = nlm_get_vfs_state(host, rqstp, &fh, &vs, accmode);
|
|
if (error) {
|
|
result->stat.stat = nlm_convert_error(error);
|
|
goto out;
|
|
}
|
|
|
|
fl.l_start = argp->alock.l_offset;
|
|
fl.l_len = argp->alock.l_len;
|
|
fl.l_pid = argp->alock.svid;
|
|
fl.l_sysid = sysid;
|
|
fl.l_whence = SEEK_SET;
|
|
if (argp->exclusive)
|
|
fl.l_type = F_WRLCK;
|
|
else
|
|
fl.l_type = F_RDLCK;
|
|
if (argp->block) {
|
|
struct nlm_async_lock *af;
|
|
CLIENT *client;
|
|
struct nlm_grantcookie cookie;
|
|
|
|
/*
|
|
* First, make sure we can contact the host's NLM.
|
|
*/
|
|
client = nlm_host_get_rpc(host, TRUE);
|
|
if (!client) {
|
|
result->stat.stat = nlm4_failed;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* First we need to check and see if there is an
|
|
* existing blocked lock that matches. This could be a
|
|
* badly behaved client or an RPC re-send. If we find
|
|
* one, just return nlm4_blocked.
|
|
*/
|
|
mtx_lock(&host->nh_lock);
|
|
TAILQ_FOREACH(af, &host->nh_pending, af_link) {
|
|
if (af->af_fl.l_start == fl.l_start
|
|
&& af->af_fl.l_len == fl.l_len
|
|
&& af->af_fl.l_pid == fl.l_pid
|
|
&& af->af_fl.l_type == fl.l_type) {
|
|
break;
|
|
}
|
|
}
|
|
if (!af) {
|
|
cookie.ng_sysid = host->nh_sysid;
|
|
cookie.ng_cookie = host->nh_grantcookie++;
|
|
}
|
|
mtx_unlock(&host->nh_lock);
|
|
if (af) {
|
|
CLNT_RELEASE(client);
|
|
result->stat.stat = nlm4_blocked;
|
|
goto out;
|
|
}
|
|
|
|
af = malloc(sizeof(struct nlm_async_lock), M_NLM,
|
|
M_WAITOK|M_ZERO);
|
|
TASK_INIT(&af->af_task, 0, nlm_lock_callback, af);
|
|
af->af_vp = vs.vs_vp;
|
|
af->af_fl = fl;
|
|
af->af_host = host;
|
|
af->af_rpc = client;
|
|
/*
|
|
* We use M_RPC here so that we can xdr_free the thing
|
|
* later.
|
|
*/
|
|
nlm_make_netobj(&af->af_granted.cookie,
|
|
(caddr_t)&cookie, sizeof(cookie), M_RPC);
|
|
af->af_granted.exclusive = argp->exclusive;
|
|
af->af_granted.alock.caller_name =
|
|
strdup(argp->alock.caller_name, M_RPC);
|
|
nlm_copy_netobj(&af->af_granted.alock.fh,
|
|
&argp->alock.fh, M_RPC);
|
|
nlm_copy_netobj(&af->af_granted.alock.oh,
|
|
&argp->alock.oh, M_RPC);
|
|
af->af_granted.alock.svid = argp->alock.svid;
|
|
af->af_granted.alock.l_offset = argp->alock.l_offset;
|
|
af->af_granted.alock.l_len = argp->alock.l_len;
|
|
|
|
/*
|
|
* Put the entry on the pending list before calling
|
|
* VOP_ADVLOCKASYNC. We do this in case the lock
|
|
* request was blocked (returning EINPROGRESS) but
|
|
* then granted before we manage to run again. The
|
|
* client may receive the granted message before we
|
|
* send our blocked reply but thats their problem.
|
|
*/
|
|
mtx_lock(&host->nh_lock);
|
|
TAILQ_INSERT_TAIL(&host->nh_pending, af, af_link);
|
|
mtx_unlock(&host->nh_lock);
|
|
|
|
error = VOP_ADVLOCKASYNC(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE,
|
|
&af->af_task, &af->af_cookie);
|
|
|
|
/*
|
|
* If the lock completed synchronously, just free the
|
|
* tracking structure now.
|
|
*/
|
|
if (error != EINPROGRESS) {
|
|
CLNT_RELEASE(af->af_rpc);
|
|
mtx_lock(&host->nh_lock);
|
|
TAILQ_REMOVE(&host->nh_pending, af, af_link);
|
|
mtx_unlock(&host->nh_lock);
|
|
xdr_free((xdrproc_t) xdr_nlm4_testargs,
|
|
&af->af_granted);
|
|
free(af, M_NLM);
|
|
} else {
|
|
NLM_DEBUG(2, "NLM: pending async lock %p for %s "
|
|
"(sysid %d)\n", af, host->nh_caller_name, sysid);
|
|
/*
|
|
* Don't vrele the vnode just yet - this must
|
|
* wait until either the async callback
|
|
* happens or the lock is cancelled.
|
|
*/
|
|
vs.vs_vp = NULL;
|
|
}
|
|
} else {
|
|
error = VOP_ADVLOCK(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE);
|
|
}
|
|
|
|
if (error) {
|
|
if (error == EINPROGRESS) {
|
|
result->stat.stat = nlm4_blocked;
|
|
} else if (error == EDEADLK) {
|
|
result->stat.stat = nlm4_deadlck;
|
|
} else if (error == EAGAIN) {
|
|
result->stat.stat = nlm4_denied;
|
|
} else {
|
|
result->stat.stat = nlm4_failed;
|
|
}
|
|
} else {
|
|
if (monitor)
|
|
nlm_host_monitor(host, argp->state);
|
|
result->stat.stat = nlm4_granted;
|
|
}
|
|
|
|
out:
|
|
nlm_release_vfs_state(&vs);
|
|
if (rpcp)
|
|
*rpcp = nlm_host_get_rpc(host, TRUE);
|
|
nlm_host_release(host);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlm_do_cancel(nlm4_cancargs *argp, nlm4_res *result, struct svc_req *rqstp,
|
|
CLIENT **rpcp)
|
|
{
|
|
fhandle_t fh;
|
|
struct vfs_state vs;
|
|
struct nlm_host *host;
|
|
int error, sysid;
|
|
struct flock fl;
|
|
struct nlm_async_lock *af;
|
|
|
|
memset(result, 0, sizeof(*result));
|
|
memset(&vs, 0, sizeof(vs));
|
|
|
|
host = nlm_find_host_by_name(argp->alock.caller_name,
|
|
svc_getrpccaller(rqstp), rqstp->rq_vers);
|
|
if (!host) {
|
|
result->stat.stat = nlm4_denied_nolocks;
|
|
return (ENOMEM);
|
|
}
|
|
|
|
NLM_DEBUG(3, "nlm_do_cancel(): caller_name = %s (sysid = %d)\n",
|
|
host->nh_caller_name, host->nh_sysid);
|
|
|
|
nlm_check_expired_locks(host);
|
|
sysid = host->nh_sysid;
|
|
|
|
nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
|
|
nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
|
|
|
|
if (time_uptime < nlm_grace_threshold) {
|
|
result->stat.stat = nlm4_denied_grace_period;
|
|
goto out;
|
|
}
|
|
|
|
error = nlm_get_vfs_state(host, rqstp, &fh, &vs, (accmode_t)0);
|
|
if (error) {
|
|
result->stat.stat = nlm_convert_error(error);
|
|
goto out;
|
|
}
|
|
|
|
fl.l_start = argp->alock.l_offset;
|
|
fl.l_len = argp->alock.l_len;
|
|
fl.l_pid = argp->alock.svid;
|
|
fl.l_sysid = sysid;
|
|
fl.l_whence = SEEK_SET;
|
|
if (argp->exclusive)
|
|
fl.l_type = F_WRLCK;
|
|
else
|
|
fl.l_type = F_RDLCK;
|
|
|
|
/*
|
|
* First we need to try and find the async lock request - if
|
|
* there isn't one, we give up and return nlm4_denied.
|
|
*/
|
|
mtx_lock(&host->nh_lock);
|
|
|
|
TAILQ_FOREACH(af, &host->nh_pending, af_link) {
|
|
if (af->af_fl.l_start == fl.l_start
|
|
&& af->af_fl.l_len == fl.l_len
|
|
&& af->af_fl.l_pid == fl.l_pid
|
|
&& af->af_fl.l_type == fl.l_type) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!af) {
|
|
mtx_unlock(&host->nh_lock);
|
|
result->stat.stat = nlm4_denied;
|
|
goto out;
|
|
}
|
|
|
|
error = nlm_cancel_async_lock(af);
|
|
|
|
if (error) {
|
|
result->stat.stat = nlm4_denied;
|
|
} else {
|
|
result->stat.stat = nlm4_granted;
|
|
}
|
|
|
|
mtx_unlock(&host->nh_lock);
|
|
|
|
out:
|
|
nlm_release_vfs_state(&vs);
|
|
if (rpcp)
|
|
*rpcp = nlm_host_get_rpc(host, TRUE);
|
|
nlm_host_release(host);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlm_do_unlock(nlm4_unlockargs *argp, nlm4_res *result, struct svc_req *rqstp,
|
|
CLIENT **rpcp)
|
|
{
|
|
fhandle_t fh;
|
|
struct vfs_state vs;
|
|
struct nlm_host *host;
|
|
int error, sysid;
|
|
struct flock fl;
|
|
|
|
memset(result, 0, sizeof(*result));
|
|
memset(&vs, 0, sizeof(vs));
|
|
|
|
host = nlm_find_host_by_name(argp->alock.caller_name,
|
|
svc_getrpccaller(rqstp), rqstp->rq_vers);
|
|
if (!host) {
|
|
result->stat.stat = nlm4_denied_nolocks;
|
|
return (ENOMEM);
|
|
}
|
|
|
|
NLM_DEBUG(3, "nlm_do_unlock(): caller_name = %s (sysid = %d)\n",
|
|
host->nh_caller_name, host->nh_sysid);
|
|
|
|
nlm_check_expired_locks(host);
|
|
sysid = host->nh_sysid;
|
|
|
|
nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
|
|
nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
|
|
|
|
if (time_uptime < nlm_grace_threshold) {
|
|
result->stat.stat = nlm4_denied_grace_period;
|
|
goto out;
|
|
}
|
|
|
|
error = nlm_get_vfs_state(host, rqstp, &fh, &vs, (accmode_t)0);
|
|
if (error) {
|
|
result->stat.stat = nlm_convert_error(error);
|
|
goto out;
|
|
}
|
|
|
|
fl.l_start = argp->alock.l_offset;
|
|
fl.l_len = argp->alock.l_len;
|
|
fl.l_pid = argp->alock.svid;
|
|
fl.l_sysid = sysid;
|
|
fl.l_whence = SEEK_SET;
|
|
fl.l_type = F_UNLCK;
|
|
error = VOP_ADVLOCK(vs.vs_vp, NULL, F_UNLCK, &fl, F_REMOTE);
|
|
|
|
/*
|
|
* Ignore the error - there is no result code for failure,
|
|
* only for grace period.
|
|
*/
|
|
result->stat.stat = nlm4_granted;
|
|
|
|
out:
|
|
nlm_release_vfs_state(&vs);
|
|
if (rpcp)
|
|
*rpcp = nlm_host_get_rpc(host, TRUE);
|
|
nlm_host_release(host);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nlm_do_granted(nlm4_testargs *argp, nlm4_res *result, struct svc_req *rqstp,
|
|
|
|
CLIENT **rpcp)
|
|
{
|
|
struct nlm_host *host;
|
|
struct nlm_waiting_lock *nw;
|
|
|
|
memset(result, 0, sizeof(*result));
|
|
|
|
host = nlm_find_host_by_addr(svc_getrpccaller(rqstp), rqstp->rq_vers);
|
|
if (!host) {
|
|
result->stat.stat = nlm4_denied_nolocks;
|
|
return (ENOMEM);
|
|
}
|
|
|
|
nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
|
|
result->stat.stat = nlm4_denied;
|
|
KFAIL_POINT_CODE(DEBUG_FP, nlm_deny_grant, goto out);
|
|
|
|
mtx_lock(&nlm_global_lock);
|
|
TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) {
|
|
if (!nw->nw_waiting)
|
|
continue;
|
|
if (argp->alock.svid == nw->nw_lock.svid
|
|
&& argp->alock.l_offset == nw->nw_lock.l_offset
|
|
&& argp->alock.l_len == nw->nw_lock.l_len
|
|
&& argp->alock.fh.n_len == nw->nw_lock.fh.n_len
|
|
&& !memcmp(argp->alock.fh.n_bytes, nw->nw_lock.fh.n_bytes,
|
|
nw->nw_lock.fh.n_len)) {
|
|
nw->nw_waiting = FALSE;
|
|
wakeup(nw);
|
|
result->stat.stat = nlm4_granted;
|
|
break;
|
|
}
|
|
}
|
|
mtx_unlock(&nlm_global_lock);
|
|
|
|
out:
|
|
if (rpcp)
|
|
*rpcp = nlm_host_get_rpc(host, TRUE);
|
|
nlm_host_release(host);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
nlm_do_granted_res(nlm4_res *argp, struct svc_req *rqstp)
|
|
{
|
|
struct nlm_host *host = NULL;
|
|
struct nlm_async_lock *af = NULL;
|
|
int error;
|
|
|
|
if (argp->cookie.n_len != sizeof(struct nlm_grantcookie)) {
|
|
NLM_DEBUG(1, "NLM: bogus grant cookie");
|
|
goto out;
|
|
}
|
|
|
|
host = nlm_find_host_by_sysid(ng_sysid(&argp->cookie));
|
|
if (!host) {
|
|
NLM_DEBUG(1, "NLM: Unknown host rejected our grant");
|
|
goto out;
|
|
}
|
|
|
|
mtx_lock(&host->nh_lock);
|
|
TAILQ_FOREACH(af, &host->nh_granted, af_link)
|
|
if (ng_cookie(&argp->cookie) ==
|
|
ng_cookie(&af->af_granted.cookie))
|
|
break;
|
|
if (af)
|
|
TAILQ_REMOVE(&host->nh_granted, af, af_link);
|
|
mtx_unlock(&host->nh_lock);
|
|
|
|
if (!af) {
|
|
NLM_DEBUG(1, "NLM: host %s (sysid %d) replied to our grant "
|
|
"with unrecognized cookie %d:%d", host->nh_caller_name,
|
|
host->nh_sysid, ng_sysid(&argp->cookie),
|
|
ng_cookie(&argp->cookie));
|
|
goto out;
|
|
}
|
|
|
|
if (argp->stat.stat != nlm4_granted) {
|
|
af->af_fl.l_type = F_UNLCK;
|
|
error = VOP_ADVLOCK(af->af_vp, NULL, F_UNLCK, &af->af_fl, F_REMOTE);
|
|
if (error) {
|
|
NLM_DEBUG(1, "NLM: host %s (sysid %d) rejected our grant "
|
|
"and we failed to unlock (%d)", host->nh_caller_name,
|
|
host->nh_sysid, error);
|
|
goto out;
|
|
}
|
|
|
|
NLM_DEBUG(5, "NLM: async lock %p rejected by host %s (sysid %d)",
|
|
af, host->nh_caller_name, host->nh_sysid);
|
|
} else {
|
|
NLM_DEBUG(5, "NLM: async lock %p accepted by host %s (sysid %d)",
|
|
af, host->nh_caller_name, host->nh_sysid);
|
|
}
|
|
|
|
out:
|
|
if (af)
|
|
nlm_free_async_lock(af);
|
|
if (host)
|
|
nlm_host_release(host);
|
|
}
|
|
|
|
void
|
|
nlm_do_free_all(nlm4_notify *argp)
|
|
{
|
|
struct nlm_host *host, *thost;
|
|
|
|
TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, thost) {
|
|
if (!strcmp(host->nh_caller_name, argp->name))
|
|
nlm_host_notify(host, argp->state);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Kernel module glue
|
|
*/
|
|
static int
|
|
nfslockd_modevent(module_t mod, int type, void *data)
|
|
{
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
return (nlm_init());
|
|
|
|
case MOD_UNLOAD:
|
|
nlm_uninit();
|
|
/* The NLM module cannot be safely unloaded. */
|
|
/* FALLTHROUGH */
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
}
|
|
static moduledata_t nfslockd_mod = {
|
|
"nfslockd",
|
|
nfslockd_modevent,
|
|
NULL,
|
|
};
|
|
DECLARE_MODULE(nfslockd, nfslockd_mod, SI_SUB_VFS, SI_ORDER_ANY);
|
|
|
|
/* So that loader and kldload(2) can find us, wherever we are.. */
|
|
MODULE_DEPEND(nfslockd, xdr, 1, 1, 1);
|
|
MODULE_DEPEND(nfslockd, krpc, 1, 1, 1);
|
|
MODULE_DEPEND(nfslockd, nfscommon, 1, 1, 1);
|
|
MODULE_VERSION(nfslockd, 1);
|