522 lines
12 KiB
C
522 lines
12 KiB
C
/*
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* linux/fs/lockd/svc.c
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*
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* This is the central lockd service.
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*
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* FIXME: Separate the lockd NFS server functionality from the lockd NFS
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* client functionality. Oh why didn't Sun create two separate
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* services in the first place?
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*
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* Authors: Olaf Kirch (okir@monad.swb.de)
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <linux/moduleparam.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/in.h>
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#include <linux/uio.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/stats.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/sunrpc/svcsock.h>
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#include <linux/lockd/lockd.h>
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#include <linux/nfs.h>
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#define NLMDBG_FACILITY NLMDBG_SVC
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#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
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#define ALLOWED_SIGS (sigmask(SIGKILL))
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static struct svc_program nlmsvc_program;
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struct nlmsvc_binding * nlmsvc_ops;
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EXPORT_SYMBOL(nlmsvc_ops);
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static DECLARE_MUTEX(nlmsvc_sema);
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static unsigned int nlmsvc_users;
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static pid_t nlmsvc_pid;
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int nlmsvc_grace_period;
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unsigned long nlmsvc_timeout;
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static DECLARE_MUTEX_LOCKED(lockd_start);
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static DECLARE_WAIT_QUEUE_HEAD(lockd_exit);
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/*
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* These can be set at insmod time (useful for NFS as root filesystem),
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* and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
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*/
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static unsigned long nlm_grace_period;
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static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
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static int nlm_udpport, nlm_tcpport;
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/*
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* Constants needed for the sysctl interface.
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*/
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static const unsigned long nlm_grace_period_min = 0;
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static const unsigned long nlm_grace_period_max = 240;
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static const unsigned long nlm_timeout_min = 3;
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static const unsigned long nlm_timeout_max = 20;
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static const int nlm_port_min = 0, nlm_port_max = 65535;
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static struct ctl_table_header * nlm_sysctl_table;
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static unsigned long set_grace_period(void)
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{
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unsigned long grace_period;
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/* Note: nlm_timeout should always be nonzero */
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if (nlm_grace_period)
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grace_period = ((nlm_grace_period + nlm_timeout - 1)
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/ nlm_timeout) * nlm_timeout * HZ;
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else
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grace_period = nlm_timeout * 5 * HZ;
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nlmsvc_grace_period = 1;
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return grace_period + jiffies;
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}
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static inline void clear_grace_period(void)
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{
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nlmsvc_grace_period = 0;
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}
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/*
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* This is the lockd kernel thread
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*/
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static void
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lockd(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 = 0;
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unsigned long grace_period_expire;
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/* Lock module and set up kernel thread */
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/* lockd_up is waiting for us to startup, so will
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* be holding a reference to this module, so it
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* is safe to just claim another reference
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*/
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__module_get(THIS_MODULE);
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lock_kernel();
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/*
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* Let our maker know we're running.
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*/
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nlmsvc_pid = current->pid;
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up(&lockd_start);
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daemonize("lockd");
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/* Process request with signals blocked, but allow SIGKILL. */
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allow_signal(SIGKILL);
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/* kick rpciod */
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rpciod_up();
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dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
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if (!nlm_timeout)
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nlm_timeout = LOCKD_DFLT_TIMEO;
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nlmsvc_timeout = nlm_timeout * HZ;
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grace_period_expire = set_grace_period();
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/*
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* The main request loop. We don't terminate until the last
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* NFS mount or NFS daemon has gone away, and we've been sent a
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* signal, or else another process has taken over our job.
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*/
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while ((nlmsvc_users || !signalled()) && nlmsvc_pid == current->pid) {
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long timeout = MAX_SCHEDULE_TIMEOUT;
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if (signalled()) {
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flush_signals(current);
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if (nlmsvc_ops) {
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nlmsvc_invalidate_all();
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grace_period_expire = set_grace_period();
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}
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}
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/*
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* Retry any blocked locks that have been notified by
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* the VFS. Don't do this during grace period.
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* (Theoretically, there shouldn't even be blocked locks
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* during grace period).
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*/
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if (!nlmsvc_grace_period) {
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timeout = nlmsvc_retry_blocked();
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} else if (time_before(grace_period_expire, jiffies))
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clear_grace_period();
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/*
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* Find a socket with data available and call its
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* recvfrom routine.
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*/
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err = svc_recv(serv, rqstp, 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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"lockd: terminating on error %d\n",
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-err);
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break;
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}
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dprintk("lockd: request from %08x\n",
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(unsigned)ntohl(rqstp->rq_addr.sin_addr.s_addr));
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svc_process(serv, rqstp);
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}
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/*
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* Check whether there's a new lockd process before
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* shutting down the hosts and clearing the slot.
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*/
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if (!nlmsvc_pid || current->pid == nlmsvc_pid) {
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if (nlmsvc_ops)
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nlmsvc_invalidate_all();
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nlm_shutdown_hosts();
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nlmsvc_pid = 0;
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} else
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printk(KERN_DEBUG
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"lockd: new process, skipping host shutdown\n");
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wake_up(&lockd_exit);
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flush_signals(current);
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/* Exit the RPC thread */
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svc_exit_thread(rqstp);
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/* release rpciod */
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rpciod_down();
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/* Release module */
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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 lockd process if it's not already up.
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*/
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int
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lockd_up(void)
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{
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static int warned;
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struct svc_serv * serv;
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int error = 0;
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down(&nlmsvc_sema);
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/*
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* Unconditionally increment the user count ... this is
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* the number of clients who _want_ a lockd process.
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*/
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nlmsvc_users++;
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/*
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* Check whether we're already up and running.
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*/
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if (nlmsvc_pid)
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goto out;
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/*
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* Sanity check: if there's no pid,
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* we should be the first user ...
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*/
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if (nlmsvc_users > 1)
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printk(KERN_WARNING
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"lockd_up: no pid, %d users??\n", nlmsvc_users);
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error = -ENOMEM;
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serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE);
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if (!serv) {
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printk(KERN_WARNING "lockd_up: create service failed\n");
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goto out;
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}
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if ((error = svc_makesock(serv, IPPROTO_UDP, nlm_udpport)) < 0
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#ifdef CONFIG_NFSD_TCP
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|| (error = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport)) < 0
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#endif
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) {
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if (warned++ == 0)
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printk(KERN_WARNING
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"lockd_up: makesock failed, error=%d\n", error);
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goto destroy_and_out;
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}
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warned = 0;
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/*
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* Create the kernel thread and wait for it to start.
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*/
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error = svc_create_thread(lockd, serv);
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if (error) {
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printk(KERN_WARNING
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"lockd_up: create thread failed, error=%d\n", error);
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goto destroy_and_out;
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}
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down(&lockd_start);
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/*
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* Note: svc_serv structures have an initial use count of 1,
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* so we exit through here on both success and failure.
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*/
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destroy_and_out:
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svc_destroy(serv);
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out:
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up(&nlmsvc_sema);
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return error;
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}
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EXPORT_SYMBOL(lockd_up);
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/*
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* Decrement the user count and bring down lockd if we're the last.
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*/
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void
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lockd_down(void)
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{
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static int warned;
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down(&nlmsvc_sema);
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if (nlmsvc_users) {
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if (--nlmsvc_users)
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goto out;
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} else
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printk(KERN_WARNING "lockd_down: no users! pid=%d\n", nlmsvc_pid);
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if (!nlmsvc_pid) {
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if (warned++ == 0)
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printk(KERN_WARNING "lockd_down: no lockd running.\n");
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goto out;
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}
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warned = 0;
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kill_proc(nlmsvc_pid, SIGKILL, 1);
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/*
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* Wait for the lockd process to exit, but since we're holding
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* the lockd semaphore, we can't wait around forever ...
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*/
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clear_thread_flag(TIF_SIGPENDING);
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interruptible_sleep_on_timeout(&lockd_exit, HZ);
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if (nlmsvc_pid) {
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printk(KERN_WARNING
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"lockd_down: lockd failed to exit, clearing pid\n");
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nlmsvc_pid = 0;
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}
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spin_lock_irq(¤t->sighand->siglock);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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out:
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up(&nlmsvc_sema);
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}
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EXPORT_SYMBOL(lockd_down);
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/*
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* Sysctl parameters (same as module parameters, different interface).
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*/
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/* Something that isn't CTL_ANY, CTL_NONE or a value that may clash. */
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#define CTL_UNNUMBERED -2
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static ctl_table nlm_sysctls[] = {
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nlm_grace_period",
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.data = &nlm_grace_period,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = &proc_doulongvec_minmax,
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.extra1 = (unsigned long *) &nlm_grace_period_min,
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.extra2 = (unsigned long *) &nlm_grace_period_max,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nlm_timeout",
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.data = &nlm_timeout,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = &proc_doulongvec_minmax,
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.extra1 = (unsigned long *) &nlm_timeout_min,
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.extra2 = (unsigned long *) &nlm_timeout_max,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nlm_udpport",
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.data = &nlm_udpport,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.extra1 = (int *) &nlm_port_min,
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.extra2 = (int *) &nlm_port_max,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nlm_tcpport",
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.data = &nlm_tcpport,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.extra1 = (int *) &nlm_port_min,
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.extra2 = (int *) &nlm_port_max,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table nlm_sysctl_dir[] = {
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nfs",
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.mode = 0555,
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.child = nlm_sysctls,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table nlm_sysctl_root[] = {
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{
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.ctl_name = CTL_FS,
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.procname = "fs",
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.mode = 0555,
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.child = nlm_sysctl_dir,
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},
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{ .ctl_name = 0 }
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};
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/*
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* Module (and driverfs) parameters.
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*/
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#define param_set_min_max(name, type, which_strtol, min, max) \
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static int param_set_##name(const char *val, struct kernel_param *kp) \
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{ \
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char *endp; \
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__typeof__(type) num = which_strtol(val, &endp, 0); \
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if (endp == val || *endp || num < (min) || num > (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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static inline int is_callback(u32 proc)
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{
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return proc == NLMPROC_GRANTED
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|| proc == NLMPROC_GRANTED_MSG
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|| proc == NLMPROC_TEST_RES
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|| proc == NLMPROC_LOCK_RES
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|| proc == NLMPROC_CANCEL_RES
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|| proc == NLMPROC_UNLOCK_RES
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|| proc == NLMPROC_NSM_NOTIFY;
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}
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static int lockd_authenticate(struct svc_rqst *rqstp)
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{
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rqstp->rq_client = NULL;
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switch (rqstp->rq_authop->flavour) {
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case RPC_AUTH_NULL:
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case RPC_AUTH_UNIX:
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if (rqstp->rq_proc == 0)
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return SVC_OK;
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if (is_callback(rqstp->rq_proc)) {
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/* Leave it to individual procedures to
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* call nlmsvc_lookup_host(rqstp)
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*/
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return SVC_OK;
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}
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return svc_set_client(rqstp);
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}
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return SVC_DENIED;
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}
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param_set_min_max(port, int, simple_strtol, 0, 65535)
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param_set_min_max(grace_period, unsigned long, simple_strtoul,
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nlm_grace_period_min, nlm_grace_period_max)
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param_set_min_max(timeout, unsigned long, simple_strtoul,
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nlm_timeout_min, nlm_timeout_max)
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MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
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MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
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MODULE_LICENSE("GPL");
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module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
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&nlm_grace_period, 0644);
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module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
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&nlm_timeout, 0644);
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module_param_call(nlm_udpport, param_set_port, param_get_int,
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&nlm_udpport, 0644);
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module_param_call(nlm_tcpport, param_set_port, param_get_int,
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&nlm_tcpport, 0644);
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/*
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* Initialising and terminating the module.
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*/
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static int __init init_nlm(void)
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{
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nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root, 0);
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return nlm_sysctl_table ? 0 : -ENOMEM;
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}
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static void __exit exit_nlm(void)
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{
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/* FIXME: delete all NLM clients */
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nlm_shutdown_hosts();
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unregister_sysctl_table(nlm_sysctl_table);
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}
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module_init(init_nlm);
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module_exit(exit_nlm);
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/*
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* Define NLM program and procedures
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*/
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static struct svc_version nlmsvc_version1 = {
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.vs_vers = 1,
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.vs_nproc = 17,
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.vs_proc = nlmsvc_procedures,
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.vs_xdrsize = NLMSVC_XDRSIZE,
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};
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static struct svc_version nlmsvc_version3 = {
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.vs_vers = 3,
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.vs_nproc = 24,
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.vs_proc = nlmsvc_procedures,
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.vs_xdrsize = NLMSVC_XDRSIZE,
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};
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#ifdef CONFIG_LOCKD_V4
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static struct svc_version nlmsvc_version4 = {
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.vs_vers = 4,
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.vs_nproc = 24,
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.vs_proc = nlmsvc_procedures4,
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.vs_xdrsize = NLMSVC_XDRSIZE,
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};
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#endif
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static struct svc_version * nlmsvc_version[] = {
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[1] = &nlmsvc_version1,
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[3] = &nlmsvc_version3,
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#ifdef CONFIG_LOCKD_V4
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[4] = &nlmsvc_version4,
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#endif
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};
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static struct svc_stat nlmsvc_stats;
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#define NLM_NRVERS (sizeof(nlmsvc_version)/sizeof(nlmsvc_version[0]))
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static struct svc_program nlmsvc_program = {
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.pg_prog = NLM_PROGRAM, /* program number */
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.pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
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.pg_vers = nlmsvc_version, /* version table */
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.pg_name = "lockd", /* service name */
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.pg_class = "nfsd", /* share authentication with nfsd */
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.pg_stats = &nlmsvc_stats, /* stats table */
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.pg_authenticate = &lockd_authenticate /* export authentication */
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};
|