![Al Viro](/assets/img/avatar_default.png)
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
270 lines
5.6 KiB
C
270 lines
5.6 KiB
C
/*
|
|
* linux/fs/lockd/mon.c
|
|
*
|
|
* The kernel statd client.
|
|
*
|
|
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
#include <linux/sunrpc/svc.h>
|
|
#include <linux/lockd/lockd.h>
|
|
#include <linux/lockd/sm_inter.h>
|
|
|
|
|
|
#define NLMDBG_FACILITY NLMDBG_MONITOR
|
|
|
|
static struct rpc_clnt * nsm_create(void);
|
|
|
|
static struct rpc_program nsm_program;
|
|
|
|
/*
|
|
* Local NSM state
|
|
*/
|
|
int nsm_local_state;
|
|
|
|
/*
|
|
* Common procedure for SM_MON/SM_UNMON calls
|
|
*/
|
|
static int
|
|
nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
int status;
|
|
struct nsm_args args;
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &args,
|
|
.rpc_resp = res,
|
|
};
|
|
|
|
clnt = nsm_create();
|
|
if (IS_ERR(clnt)) {
|
|
status = PTR_ERR(clnt);
|
|
goto out;
|
|
}
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
args.mon_name = nsm->sm_name;
|
|
args.addr = nsm->sm_addr.sin_addr.s_addr;
|
|
args.prog = NLM_PROGRAM;
|
|
args.vers = 3;
|
|
args.proc = NLMPROC_NSM_NOTIFY;
|
|
memset(res, 0, sizeof(*res));
|
|
|
|
msg.rpc_proc = &clnt->cl_procinfo[proc];
|
|
status = rpc_call_sync(clnt, &msg, 0);
|
|
if (status < 0)
|
|
printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
|
|
status);
|
|
else
|
|
status = 0;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Set up monitoring of a remote host
|
|
*/
|
|
int
|
|
nsm_monitor(struct nlm_host *host)
|
|
{
|
|
struct nsm_handle *nsm = host->h_nsmhandle;
|
|
struct nsm_res res;
|
|
int status;
|
|
|
|
dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
|
|
BUG_ON(nsm == NULL);
|
|
|
|
if (nsm->sm_monitored)
|
|
return 0;
|
|
|
|
status = nsm_mon_unmon(nsm, SM_MON, &res);
|
|
|
|
if (status < 0 || res.status != 0)
|
|
printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
|
|
else
|
|
nsm->sm_monitored = 1;
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Cease to monitor remote host
|
|
*/
|
|
int
|
|
nsm_unmonitor(struct nlm_host *host)
|
|
{
|
|
struct nsm_handle *nsm = host->h_nsmhandle;
|
|
struct nsm_res res;
|
|
int status = 0;
|
|
|
|
if (nsm == NULL)
|
|
return 0;
|
|
host->h_nsmhandle = NULL;
|
|
|
|
if (atomic_read(&nsm->sm_count) == 1
|
|
&& nsm->sm_monitored && !nsm->sm_sticky) {
|
|
dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
|
|
|
|
status = nsm_mon_unmon(nsm, SM_UNMON, &res);
|
|
if (status < 0)
|
|
printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
|
|
host->h_name);
|
|
else
|
|
nsm->sm_monitored = 0;
|
|
}
|
|
nsm_release(nsm);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Create NSM client for the local host
|
|
*/
|
|
static struct rpc_clnt *
|
|
nsm_create(void)
|
|
{
|
|
struct sockaddr_in sin = {
|
|
.sin_family = AF_INET,
|
|
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
|
|
.sin_port = 0,
|
|
};
|
|
struct rpc_create_args args = {
|
|
.protocol = IPPROTO_UDP,
|
|
.address = (struct sockaddr *)&sin,
|
|
.addrsize = sizeof(sin),
|
|
.servername = "localhost",
|
|
.program = &nsm_program,
|
|
.version = SM_VERSION,
|
|
.authflavor = RPC_AUTH_NULL,
|
|
.flags = (RPC_CLNT_CREATE_ONESHOT),
|
|
};
|
|
|
|
return rpc_create(&args);
|
|
}
|
|
|
|
/*
|
|
* XDR functions for NSM.
|
|
*/
|
|
|
|
static __be32 *
|
|
xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
|
|
{
|
|
char buffer[20], *name;
|
|
|
|
/*
|
|
* Use the dotted-quad IP address of the remote host as
|
|
* identifier. Linux statd always looks up the canonical
|
|
* hostname first for whatever remote hostname it receives,
|
|
* so this works alright.
|
|
*/
|
|
if (nsm_use_hostnames) {
|
|
name = argp->mon_name;
|
|
} else {
|
|
sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
|
|
name = buffer;
|
|
}
|
|
if (!(p = xdr_encode_string(p, name))
|
|
|| !(p = xdr_encode_string(p, utsname()->nodename)))
|
|
return ERR_PTR(-EIO);
|
|
*p++ = htonl(argp->prog);
|
|
*p++ = htonl(argp->vers);
|
|
*p++ = htonl(argp->proc);
|
|
|
|
return p;
|
|
}
|
|
|
|
static int
|
|
xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
|
|
{
|
|
p = xdr_encode_common(rqstp, p, argp);
|
|
if (IS_ERR(p))
|
|
return PTR_ERR(p);
|
|
|
|
/* Surprise - there may even be room for an IPv6 address now */
|
|
*p++ = argp->addr;
|
|
*p++ = 0;
|
|
*p++ = 0;
|
|
*p++ = 0;
|
|
rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
|
|
{
|
|
p = xdr_encode_common(rqstp, p, argp);
|
|
if (IS_ERR(p))
|
|
return PTR_ERR(p);
|
|
rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
|
|
{
|
|
resp->status = ntohl(*p++);
|
|
resp->state = ntohl(*p++);
|
|
dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
|
|
resp->status, resp->state);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
|
|
{
|
|
resp->state = ntohl(*p++);
|
|
return 0;
|
|
}
|
|
|
|
#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
|
|
#define SM_my_id_sz (3+1+SM_my_name_sz)
|
|
#define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
|
|
#define SM_mon_sz (SM_mon_id_sz+4)
|
|
#define SM_monres_sz 2
|
|
#define SM_unmonres_sz 1
|
|
|
|
#ifndef MAX
|
|
# define MAX(a, b) (((a) > (b))? (a) : (b))
|
|
#endif
|
|
|
|
static struct rpc_procinfo nsm_procedures[] = {
|
|
[SM_MON] = {
|
|
.p_proc = SM_MON,
|
|
.p_encode = (kxdrproc_t) xdr_encode_mon,
|
|
.p_decode = (kxdrproc_t) xdr_decode_stat_res,
|
|
.p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2,
|
|
.p_statidx = SM_MON,
|
|
.p_name = "MONITOR",
|
|
},
|
|
[SM_UNMON] = {
|
|
.p_proc = SM_UNMON,
|
|
.p_encode = (kxdrproc_t) xdr_encode_unmon,
|
|
.p_decode = (kxdrproc_t) xdr_decode_stat,
|
|
.p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2,
|
|
.p_statidx = SM_UNMON,
|
|
.p_name = "UNMONITOR",
|
|
},
|
|
};
|
|
|
|
static struct rpc_version nsm_version1 = {
|
|
.number = 1,
|
|
.nrprocs = ARRAY_SIZE(nsm_procedures),
|
|
.procs = nsm_procedures
|
|
};
|
|
|
|
static struct rpc_version * nsm_version[] = {
|
|
[1] = &nsm_version1,
|
|
};
|
|
|
|
static struct rpc_stat nsm_stats;
|
|
|
|
static struct rpc_program nsm_program = {
|
|
.name = "statd",
|
|
.number = SM_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(nsm_version),
|
|
.version = nsm_version,
|
|
.stats = &nsm_stats
|
|
};
|