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89996df4b5
If lockd is signalled soon enough after restart then locks_start_grace() will try to re-add an entry to a list and trigger a lock corruption warning. Thanks to Wang Chen for the problem report and diagnosis. WARNING: at lib/list_debug.c:26 __list_add+0x27/0x5c() ... list_add corruption. next->prev should be prev (ef8fe958), but was ef8ff128. (next=ef8ff128). ... Pid: 23062, comm: lockd Tainted: G W 2.6.30-rc2 #3 Call Trace: [<c042d5b5>] warn_slowpath+0x71/0xa0 [<c0422a96>] ? update_curr+0x11d/0x125 [<c044b12d>] ? trace_hardirqs_on_caller+0x18/0x150 [<c044b270>] ? trace_hardirqs_on+0xb/0xd [<c051c61a>] ? _raw_spin_lock+0x53/0xfa [<c051c89f>] __list_add+0x27/0x5c [<ef8f6daa>] locks_start_grace+0x22/0x30 [lockd] [<ef8f34da>] set_grace_period+0x39/0x53 [lockd] [<c06b8921>] ? lock_kernel+0x1c/0x28 [<ef8f3558>] lockd+0x64/0x164 [lockd] [<c044b12d>] ? trace_hardirqs_on_caller+0x18/0x150 [<c04227b0>] ? complete+0x34/0x3e [<ef8f34f4>] ? lockd+0x0/0x164 [lockd] [<ef8f34f4>] ? lockd+0x0/0x164 [lockd] [<c043dd42>] kthread+0x45/0x6b [<c043dcfd>] ? kthread+0x0/0x6b [<c0403c23>] kernel_thread_helper+0x7/0x10 Reported-by: Wang Chen <wangchen@cn.fujitsu.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: stable@kernel.org
591 lines
14 KiB
C
591 lines
14 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/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/mutex.h>
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#include <linux/kthread.h>
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#include <linux/freezer.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 <net/ip.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_GPL(nlmsvc_ops);
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static DEFINE_MUTEX(nlmsvc_mutex);
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static unsigned int nlmsvc_users;
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static struct task_struct *nlmsvc_task;
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static struct svc_rqst *nlmsvc_rqst;
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unsigned long nlmsvc_timeout;
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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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/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
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static unsigned int nlm_max_connections = 1024;
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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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#ifdef CONFIG_SYSCTL
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static struct ctl_table_header * nlm_sysctl_table;
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#endif
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static unsigned long get_lockd_grace_period(void)
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{
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/* Note: nlm_timeout should always be nonzero */
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if (nlm_grace_period)
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return roundup(nlm_grace_period, nlm_timeout) * HZ;
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else
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return nlm_timeout * 5 * HZ;
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}
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static struct lock_manager lockd_manager = {
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};
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static void grace_ender(struct work_struct *not_used)
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{
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locks_end_grace(&lockd_manager);
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}
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static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
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static void set_grace_period(void)
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{
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unsigned long grace_period = get_lockd_grace_period();
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locks_start_grace(&lockd_manager);
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cancel_delayed_work_sync(&grace_period_end);
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schedule_delayed_work(&grace_period_end, grace_period);
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}
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static void restart_grace(void)
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{
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if (nlmsvc_ops) {
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cancel_delayed_work_sync(&grace_period_end);
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locks_end_grace(&lockd_manager);
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nlmsvc_invalidate_all();
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set_grace_period();
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}
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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 int
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lockd(void *vrqstp)
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{
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int err = 0, preverr = 0;
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struct svc_rqst *rqstp = vrqstp;
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/* try_to_freeze() is called from svc_recv() */
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set_freezable();
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/* Allow SIGKILL to tell lockd to drop all of its locks */
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allow_signal(SIGKILL);
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dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
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/*
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* FIXME: it would be nice if lockd didn't spend its entire life
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* running under the BKL. At the very least, it would be good to
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* have someone clarify what it's intended to protect here. I've
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* seen some handwavy posts about posix locking needing to be
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* done under the BKL, but it's far from clear.
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*/
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lock_kernel();
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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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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.
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*/
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while (!kthread_should_stop()) {
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long timeout = MAX_SCHEDULE_TIMEOUT;
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RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
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/* update sv_maxconn if it has changed */
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rqstp->rq_server->sv_maxconn = nlm_max_connections;
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if (signalled()) {
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flush_signals(current);
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restart_grace();
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continue;
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}
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timeout = nlmsvc_retry_blocked();
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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(rqstp, timeout);
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if (err == -EAGAIN || err == -EINTR) {
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preverr = err;
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continue;
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}
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if (err < 0) {
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if (err != preverr) {
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printk(KERN_WARNING "%s: unexpected error "
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"from svc_recv (%d)\n", __func__, err);
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preverr = err;
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}
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schedule_timeout_interruptible(HZ);
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continue;
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}
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preverr = err;
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dprintk("lockd: request from %s\n",
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svc_print_addr(rqstp, buf, sizeof(buf)));
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svc_process(rqstp);
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}
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flush_signals(current);
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cancel_delayed_work_sync(&grace_period_end);
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locks_end_grace(&lockd_manager);
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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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unlock_kernel();
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return 0;
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}
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static int create_lockd_listener(struct svc_serv *serv, const char *name,
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const int family, const unsigned short port)
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{
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struct svc_xprt *xprt;
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xprt = svc_find_xprt(serv, name, family, 0);
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if (xprt == NULL)
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return svc_create_xprt(serv, name, family, port,
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SVC_SOCK_DEFAULTS);
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svc_xprt_put(xprt);
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return 0;
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}
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static int create_lockd_family(struct svc_serv *serv, const int family)
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{
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int err;
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err = create_lockd_listener(serv, "udp", family, nlm_udpport);
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if (err < 0)
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return err;
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return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
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}
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/*
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* Ensure there are active UDP and TCP listeners for lockd.
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*
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* Even if we have only TCP NFS mounts and/or TCP NFSDs, some
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* local services (such as rpc.statd) still require UDP, and
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* some NFS servers do not yet support NLM over TCP.
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*
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* Returns zero if all listeners are available; otherwise a
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* negative errno value is returned.
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*/
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static int make_socks(struct svc_serv *serv)
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{
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static int warned;
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int err;
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err = create_lockd_family(serv, PF_INET);
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if (err < 0)
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goto out_err;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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err = create_lockd_family(serv, PF_INET6);
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if (err < 0 && err != -EAFNOSUPPORT)
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goto out_err;
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#endif /* CONFIG_IPV6 || CONFIG_IPV6_MODULE */
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warned = 0;
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return 0;
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out_err:
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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", err);
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return err;
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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 lockd_up(void)
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{
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struct svc_serv *serv;
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int error = 0;
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mutex_lock(&nlmsvc_mutex);
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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_rqst)
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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)
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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, NULL);
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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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error = make_socks(serv);
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if (error < 0)
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goto destroy_and_out;
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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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nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
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if (IS_ERR(nlmsvc_rqst)) {
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error = PTR_ERR(nlmsvc_rqst);
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nlmsvc_rqst = NULL;
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printk(KERN_WARNING
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"lockd_up: svc_rqst allocation failed, error=%d\n",
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error);
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goto destroy_and_out;
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}
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svc_sock_update_bufs(serv);
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serv->sv_maxconn = nlm_max_connections;
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nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
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if (IS_ERR(nlmsvc_task)) {
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error = PTR_ERR(nlmsvc_task);
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svc_exit_thread(nlmsvc_rqst);
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nlmsvc_task = NULL;
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nlmsvc_rqst = NULL;
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printk(KERN_WARNING
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"lockd_up: kthread_run failed, error=%d\n", error);
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goto destroy_and_out;
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}
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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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if (!error)
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nlmsvc_users++;
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mutex_unlock(&nlmsvc_mutex);
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return error;
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}
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EXPORT_SYMBOL_GPL(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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mutex_lock(&nlmsvc_mutex);
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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_ERR "lockd_down: no users! task=%p\n",
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nlmsvc_task);
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BUG();
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}
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if (!nlmsvc_task) {
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printk(KERN_ERR "lockd_down: no lockd running.\n");
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BUG();
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}
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kthread_stop(nlmsvc_task);
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svc_exit_thread(nlmsvc_rqst);
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nlmsvc_task = NULL;
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nlmsvc_rqst = NULL;
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out:
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mutex_unlock(&nlmsvc_mutex);
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}
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EXPORT_SYMBOL_GPL(lockd_down);
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#ifdef CONFIG_SYSCTL
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/*
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* Sysctl parameters (same as module parameters, different interface).
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*/
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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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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nsm_use_hostnames",
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.data = &nsm_use_hostnames,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nsm_local_state",
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.data = &nsm_local_state,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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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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#endif /* CONFIG_SYSCTL */
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/*
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* Module (and sysfs) 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
|
|
* call nlmsvc_lookup_host(rqstp)
|
|
*/
|
|
return SVC_OK;
|
|
}
|
|
return svc_set_client(rqstp);
|
|
}
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
|
|
param_set_min_max(port, int, simple_strtol, 0, 65535)
|
|
param_set_min_max(grace_period, unsigned long, simple_strtoul,
|
|
nlm_grace_period_min, nlm_grace_period_max)
|
|
param_set_min_max(timeout, unsigned long, simple_strtoul,
|
|
nlm_timeout_min, nlm_timeout_max)
|
|
|
|
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
|
|
MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
|
|
&nlm_grace_period, 0644);
|
|
module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
|
|
&nlm_timeout, 0644);
|
|
module_param_call(nlm_udpport, param_set_port, param_get_int,
|
|
&nlm_udpport, 0644);
|
|
module_param_call(nlm_tcpport, param_set_port, param_get_int,
|
|
&nlm_tcpport, 0644);
|
|
module_param(nsm_use_hostnames, bool, 0644);
|
|
module_param(nlm_max_connections, uint, 0644);
|
|
|
|
/*
|
|
* Initialising and terminating the module.
|
|
*/
|
|
|
|
static int __init init_nlm(void)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
|
|
return nlm_sysctl_table ? 0 : -ENOMEM;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static void __exit exit_nlm(void)
|
|
{
|
|
/* FIXME: delete all NLM clients */
|
|
nlm_shutdown_hosts();
|
|
#ifdef CONFIG_SYSCTL
|
|
unregister_sysctl_table(nlm_sysctl_table);
|
|
#endif
|
|
}
|
|
|
|
module_init(init_nlm);
|
|
module_exit(exit_nlm);
|
|
|
|
/*
|
|
* Define NLM program and procedures
|
|
*/
|
|
static struct svc_version nlmsvc_version1 = {
|
|
.vs_vers = 1,
|
|
.vs_nproc = 17,
|
|
.vs_proc = nlmsvc_procedures,
|
|
.vs_xdrsize = NLMSVC_XDRSIZE,
|
|
};
|
|
static struct svc_version nlmsvc_version3 = {
|
|
.vs_vers = 3,
|
|
.vs_nproc = 24,
|
|
.vs_proc = nlmsvc_procedures,
|
|
.vs_xdrsize = NLMSVC_XDRSIZE,
|
|
};
|
|
#ifdef CONFIG_LOCKD_V4
|
|
static struct svc_version nlmsvc_version4 = {
|
|
.vs_vers = 4,
|
|
.vs_nproc = 24,
|
|
.vs_proc = nlmsvc_procedures4,
|
|
.vs_xdrsize = NLMSVC_XDRSIZE,
|
|
};
|
|
#endif
|
|
static struct svc_version * nlmsvc_version[] = {
|
|
[1] = &nlmsvc_version1,
|
|
[3] = &nlmsvc_version3,
|
|
#ifdef CONFIG_LOCKD_V4
|
|
[4] = &nlmsvc_version4,
|
|
#endif
|
|
};
|
|
|
|
static struct svc_stat nlmsvc_stats;
|
|
|
|
#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
|
|
static struct svc_program nlmsvc_program = {
|
|
.pg_prog = NLM_PROGRAM, /* program number */
|
|
.pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
|
|
.pg_vers = nlmsvc_version, /* version table */
|
|
.pg_name = "lockd", /* service name */
|
|
.pg_class = "nfsd", /* share authentication with nfsd */
|
|
.pg_stats = &nlmsvc_stats, /* stats table */
|
|
.pg_authenticate = &lockd_authenticate /* export authentication */
|
|
};
|