![David Howells](/assets/img/avatar_default.png)
Generalise the nfs_client structure by: (1) Moving nfs_client to a more general place (nfs_fs_sb.h). (2) Renaming its maintenance routines to be non-NFS4 specific. (3) Move those maintenance routines to a new non-NFS4 specific file (client.c) and move the declarations to internal.h. (4) Make nfs_find/get_client() take a full sockaddr_in to include the port number (will be required for NFS2/3). (5) Make nfs_find/get_client() take the NFS protocol version (again will be required to differentiate NFS2, 3 & 4 client records). Also: (6) Make nfs_client construction proceed akin to inodes, marking them as under construction and providing a function to indicate completion. (7) Make nfs_get_client() wait interruptibly if it finds a client that it can share, but that client is currently being constructed. (8) Make nfs4_create_client() use (6) and (7) instead of locking cl_sem. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
212 lines
5.1 KiB
C
212 lines
5.1 KiB
C
/*
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* linux/fs/nfs/callback.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback handling
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*/
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#include <linux/completion.h>
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#include <linux/ip.h>
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#include <linux/module.h>
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#include <linux/smp_lock.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/nfs_fs.h>
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#include <linux/mutex.h>
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#include <net/inet_sock.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "internal.h"
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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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struct nfs_callback_data {
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unsigned int users;
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struct svc_serv *serv;
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pid_t pid;
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struct completion started;
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struct completion stopped;
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};
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static struct nfs_callback_data nfs_callback_info;
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static DEFINE_MUTEX(nfs_callback_mutex);
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static struct svc_program nfs4_callback_program;
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unsigned int nfs_callback_set_tcpport;
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unsigned short nfs_callback_tcpport;
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static const int nfs_set_port_min = 0;
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static const int nfs_set_port_max = 65535;
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static int param_set_port(const char *val, struct kernel_param *kp)
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{
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char *endp;
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int num = simple_strtol(val, &endp, 0);
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if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
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return -EINVAL;
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*((int *)kp->arg) = num;
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return 0;
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}
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module_param_call(callback_tcpport, param_set_port, param_get_int,
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&nfs_callback_set_tcpport, 0644);
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/*
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* This is the callback kernel thread.
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*/
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static void nfs_callback_svc(struct svc_rqst *rqstp)
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{
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struct svc_serv *serv = rqstp->rq_server;
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int err;
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__module_get(THIS_MODULE);
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lock_kernel();
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nfs_callback_info.pid = current->pid;
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daemonize("nfsv4-svc");
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/* Process request with signals blocked, but allow SIGKILL. */
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allow_signal(SIGKILL);
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complete(&nfs_callback_info.started);
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for(;;) {
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if (signalled()) {
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if (nfs_callback_info.users == 0)
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break;
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flush_signals(current);
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}
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/*
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* Listen for a request on the socket
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*/
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err = svc_recv(serv, rqstp, MAX_SCHEDULE_TIMEOUT);
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if (err == -EAGAIN || err == -EINTR)
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continue;
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if (err < 0) {
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printk(KERN_WARNING
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"%s: terminating on error %d\n",
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__FUNCTION__, -err);
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break;
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}
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dprintk("%s: request from %u.%u.%u.%u\n", __FUNCTION__,
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NIPQUAD(rqstp->rq_addr.sin_addr.s_addr));
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svc_process(serv, rqstp);
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}
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svc_exit_thread(rqstp);
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nfs_callback_info.pid = 0;
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complete(&nfs_callback_info.stopped);
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unlock_kernel();
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module_put_and_exit(0);
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}
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/*
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* Bring up the server process if it is not already up.
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*/
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int nfs_callback_up(void)
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{
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struct svc_serv *serv;
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struct svc_sock *svsk;
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int ret = 0;
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lock_kernel();
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mutex_lock(&nfs_callback_mutex);
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if (nfs_callback_info.users++ || nfs_callback_info.pid != 0)
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goto out;
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init_completion(&nfs_callback_info.started);
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init_completion(&nfs_callback_info.stopped);
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serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE);
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ret = -ENOMEM;
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if (!serv)
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goto out_err;
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/* FIXME: We don't want to register this socket with the portmapper */
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ret = svc_makesock(serv, IPPROTO_TCP, nfs_callback_set_tcpport);
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if (ret < 0)
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goto out_destroy;
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if (!list_empty(&serv->sv_permsocks)) {
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svsk = list_entry(serv->sv_permsocks.next,
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struct svc_sock, sk_list);
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nfs_callback_tcpport = ntohs(inet_sk(svsk->sk_sk)->sport);
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dprintk ("Callback port = 0x%x\n", nfs_callback_tcpport);
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} else
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BUG();
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ret = svc_create_thread(nfs_callback_svc, serv);
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if (ret < 0)
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goto out_destroy;
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nfs_callback_info.serv = serv;
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wait_for_completion(&nfs_callback_info.started);
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out:
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mutex_unlock(&nfs_callback_mutex);
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unlock_kernel();
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return ret;
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out_destroy:
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svc_destroy(serv);
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out_err:
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nfs_callback_info.users--;
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goto out;
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}
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/*
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* Kill the server process if it is not already up.
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*/
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void nfs_callback_down(void)
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{
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lock_kernel();
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mutex_lock(&nfs_callback_mutex);
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nfs_callback_info.users--;
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do {
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if (nfs_callback_info.users != 0 || nfs_callback_info.pid == 0)
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break;
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if (kill_proc(nfs_callback_info.pid, SIGKILL, 1) < 0)
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break;
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} while (wait_for_completion_timeout(&nfs_callback_info.stopped, 5*HZ) == 0);
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mutex_unlock(&nfs_callback_mutex);
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unlock_kernel();
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}
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static int nfs_callback_authenticate(struct svc_rqst *rqstp)
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{
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struct sockaddr_in *addr = &rqstp->rq_addr;
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struct nfs_client *clp;
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/* Don't talk to strangers */
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clp = nfs_find_client(addr, 4);
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if (clp == NULL)
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return SVC_DROP;
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dprintk("%s: %u.%u.%u.%u NFSv4 callback!\n", __FUNCTION__, NIPQUAD(addr->sin_addr));
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nfs_put_client(clp);
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switch (rqstp->rq_authop->flavour) {
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case RPC_AUTH_NULL:
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if (rqstp->rq_proc != CB_NULL)
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return SVC_DENIED;
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break;
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case RPC_AUTH_UNIX:
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break;
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case RPC_AUTH_GSS:
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/* FIXME: RPCSEC_GSS handling? */
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default:
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return SVC_DENIED;
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}
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return SVC_OK;
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}
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/*
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* Define NFS4 callback program
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*/
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static struct svc_version *nfs4_callback_version[] = {
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[1] = &nfs4_callback_version1,
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};
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static struct svc_stat nfs4_callback_stats;
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static struct svc_program nfs4_callback_program = {
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.pg_prog = NFS4_CALLBACK, /* RPC service number */
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.pg_nvers = ARRAY_SIZE(nfs4_callback_version), /* Number of entries */
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.pg_vers = nfs4_callback_version, /* version table */
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.pg_name = "NFSv4 callback", /* service name */
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.pg_class = "nfs", /* authentication class */
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.pg_stats = &nfs4_callback_stats,
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.pg_authenticate = nfs_callback_authenticate,
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};
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