diff options
Diffstat (limited to 'fs/lockd/mon.c')
| -rw-r--r-- | fs/lockd/mon.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c new file mode 100644 index 00000000000..6fc1bebeec1 --- /dev/null +++ b/fs/lockd/mon.c @@ -0,0 +1,246 @@ +/* + * 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 + */ +u32 nsm_local_state; + +/* + * Common procedure for SM_MON/SM_UNMON calls + */ +static int +nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res) +{ + struct rpc_clnt *clnt; + int status; + struct nsm_args args; + + clnt = nsm_create(); + if (IS_ERR(clnt)) { + status = PTR_ERR(clnt); + goto out; + } + + args.addr = host->h_addr.sin_addr.s_addr; + args.proto= (host->h_proto<<1) | host->h_server; + args.prog = NLM_PROGRAM; + args.vers = host->h_version; + args.proc = NLMPROC_NSM_NOTIFY; + memset(res, 0, sizeof(*res)); + + status = rpc_call(clnt, proc, &args, res, 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_res res; + int status; + + dprintk("lockd: nsm_monitor(%s)\n", host->h_name); + + status = nsm_mon_unmon(host, SM_MON, &res); + + if (status < 0 || res.status != 0) + printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name); + else + host->h_monitored = 1; + return status; +} + +/* + * Cease to monitor remote host + */ +int +nsm_unmonitor(struct nlm_host *host) +{ + struct nsm_res res; + int status; + + dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name); + + status = nsm_mon_unmon(host, SM_UNMON, &res); + if (status < 0) + printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name); + else + host->h_monitored = 0; + return status; +} + +/* + * Create NSM client for the local host + */ +static struct rpc_clnt * +nsm_create(void) +{ + struct rpc_xprt *xprt; + struct rpc_clnt *clnt; + struct sockaddr_in sin; + + sin.sin_family = AF_INET; + sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); + sin.sin_port = 0; + + xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL); + if (IS_ERR(xprt)) + return (struct rpc_clnt *)xprt; + + clnt = rpc_create_client(xprt, "localhost", + &nsm_program, SM_VERSION, + RPC_AUTH_NULL); + if (IS_ERR(clnt)) + goto out_destroy; + clnt->cl_softrtry = 1; + clnt->cl_chatty = 1; + clnt->cl_oneshot = 1; + xprt->resvport = 1; /* NSM requires a reserved port */ + return clnt; + +out_destroy: + xprt_destroy(xprt); + return clnt; +} + +/* + * XDR functions for NSM. + */ + +static u32 * +xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp) +{ + char buffer[20]; + + /* + * 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. + */ + sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr)); + if (!(p = xdr_encode_string(p, buffer)) + || !(p = xdr_encode_string(p, system_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, u32 *p, struct nsm_args *argp) +{ + p = xdr_encode_common(rqstp, p, argp); + if (IS_ERR(p)) + return PTR_ERR(p); + *p++ = argp->addr; + *p++ = argp->vers; + *p++ = argp->proto; + *p++ = 0; + rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); + return 0; +} + +static int +xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *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, u32 *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, u32 *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, + }, +[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, + }, +}; + +static struct rpc_version nsm_version1 = { + .number = 1, + .nrprocs = sizeof(nsm_procedures)/sizeof(nsm_procedures[0]), + .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 = sizeof(nsm_version)/sizeof(nsm_version[0]), + .version = nsm_version, + .stats = &nsm_stats +}; |