![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
247 lines
5.2 KiB
C
247 lines
5.2 KiB
C
/*
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* linux/fs/lockd/mon.c
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*
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* The kernel statd client.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/utsname.h>
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#include <linux/kernel.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/lockd/lockd.h>
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#include <linux/lockd/sm_inter.h>
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#define NLMDBG_FACILITY NLMDBG_MONITOR
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static struct rpc_clnt * nsm_create(void);
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static struct rpc_program nsm_program;
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/*
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* Local NSM state
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*/
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u32 nsm_local_state;
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/*
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* Common procedure for SM_MON/SM_UNMON calls
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*/
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static int
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nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res)
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{
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struct rpc_clnt *clnt;
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int status;
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struct nsm_args args;
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clnt = nsm_create();
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if (IS_ERR(clnt)) {
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status = PTR_ERR(clnt);
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goto out;
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}
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args.addr = host->h_addr.sin_addr.s_addr;
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args.proto= (host->h_proto<<1) | host->h_server;
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args.prog = NLM_PROGRAM;
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args.vers = host->h_version;
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args.proc = NLMPROC_NSM_NOTIFY;
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memset(res, 0, sizeof(*res));
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status = rpc_call(clnt, proc, &args, res, 0);
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if (status < 0)
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printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
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status);
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else
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status = 0;
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out:
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return status;
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}
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/*
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* Set up monitoring of a remote host
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*/
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int
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nsm_monitor(struct nlm_host *host)
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{
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struct nsm_res res;
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int status;
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dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
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status = nsm_mon_unmon(host, SM_MON, &res);
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if (status < 0 || res.status != 0)
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printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
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else
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host->h_monitored = 1;
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return status;
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}
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/*
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* Cease to monitor remote host
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*/
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int
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nsm_unmonitor(struct nlm_host *host)
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{
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struct nsm_res res;
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int status;
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dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
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status = nsm_mon_unmon(host, SM_UNMON, &res);
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if (status < 0)
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printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name);
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else
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host->h_monitored = 0;
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return status;
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}
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/*
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* Create NSM client for the local host
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*/
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static struct rpc_clnt *
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nsm_create(void)
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{
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struct rpc_xprt *xprt;
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struct rpc_clnt *clnt;
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struct sockaddr_in sin;
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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sin.sin_port = 0;
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xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL);
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if (IS_ERR(xprt))
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return (struct rpc_clnt *)xprt;
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clnt = rpc_create_client(xprt, "localhost",
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&nsm_program, SM_VERSION,
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RPC_AUTH_NULL);
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if (IS_ERR(clnt))
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goto out_destroy;
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clnt->cl_softrtry = 1;
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clnt->cl_chatty = 1;
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clnt->cl_oneshot = 1;
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xprt->resvport = 1; /* NSM requires a reserved port */
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return clnt;
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out_destroy:
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xprt_destroy(xprt);
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return clnt;
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}
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/*
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* XDR functions for NSM.
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*/
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static u32 *
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xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
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{
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char buffer[20];
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/*
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* Use the dotted-quad IP address of the remote host as
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* identifier. Linux statd always looks up the canonical
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* hostname first for whatever remote hostname it receives,
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* so this works alright.
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*/
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sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
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if (!(p = xdr_encode_string(p, buffer))
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|| !(p = xdr_encode_string(p, system_utsname.nodename)))
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return ERR_PTR(-EIO);
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*p++ = htonl(argp->prog);
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*p++ = htonl(argp->vers);
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*p++ = htonl(argp->proc);
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return p;
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}
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static int
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xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
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{
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p = xdr_encode_common(rqstp, p, argp);
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if (IS_ERR(p))
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return PTR_ERR(p);
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*p++ = argp->addr;
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*p++ = argp->vers;
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*p++ = argp->proto;
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*p++ = 0;
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rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
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return 0;
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}
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static int
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xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
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{
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p = xdr_encode_common(rqstp, p, argp);
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if (IS_ERR(p))
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return PTR_ERR(p);
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rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
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return 0;
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}
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static int
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xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
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{
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resp->status = ntohl(*p++);
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resp->state = ntohl(*p++);
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dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
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resp->status, resp->state);
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return 0;
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}
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static int
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xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
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{
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resp->state = ntohl(*p++);
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return 0;
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}
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#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
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#define SM_my_id_sz (3+1+SM_my_name_sz)
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#define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
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#define SM_mon_sz (SM_mon_id_sz+4)
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#define SM_monres_sz 2
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#define SM_unmonres_sz 1
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#ifndef MAX
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# define MAX(a, b) (((a) > (b))? (a) : (b))
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#endif
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static struct rpc_procinfo nsm_procedures[] = {
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[SM_MON] = {
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.p_proc = SM_MON,
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.p_encode = (kxdrproc_t) xdr_encode_mon,
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.p_decode = (kxdrproc_t) xdr_decode_stat_res,
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.p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2,
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},
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[SM_UNMON] = {
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.p_proc = SM_UNMON,
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.p_encode = (kxdrproc_t) xdr_encode_unmon,
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.p_decode = (kxdrproc_t) xdr_decode_stat,
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.p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2,
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},
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};
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static struct rpc_version nsm_version1 = {
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.number = 1,
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.nrprocs = sizeof(nsm_procedures)/sizeof(nsm_procedures[0]),
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.procs = nsm_procedures
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};
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static struct rpc_version * nsm_version[] = {
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[1] = &nsm_version1,
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};
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static struct rpc_stat nsm_stats;
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static struct rpc_program nsm_program = {
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.name = "statd",
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.number = SM_PROGRAM,
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.nrvers = sizeof(nsm_version)/sizeof(nsm_version[0]),
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.version = nsm_version,
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.stats = &nsm_stats
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};
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