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authorAlan Somers <asomers@FreeBSD.org>2016-05-28 17:43:40 +0000
committerAlan Somers <asomers@FreeBSD.org>2016-05-28 17:43:40 +0000
commit7a0c41d5d7d4e9770ef6f5d56f893efc8f18ab7c (patch)
treeb276df22690bfddec70e75c8b9f2f7c8df80cbc6 /cddl/usr.sbin/zfsd/callout.cc
parent1766eeafce33a70bb8d54ecf0ca57cce3fbb38cf (diff)
downloadsrc-7a0c41d5d7d4e9770ef6f5d56f893efc8f18ab7c.tar.gz
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zfsd(8), the ZFS fault management daemon
Add zfsd, which deals with hard drive faults in ZFS pools. It manages hotspares and replements in drive slots that publish physical paths. cddl/usr.sbin/zfsd Add zfsd(8) and its unit tests cddl/usr.sbin/Makefile Add zfsd to the build lib/libdevdctl A C++ library that helps devd clients process events lib/Makefile share/mk/bsd.libnames.mk share/mk/src.libnames.mk Add libdevdctl to the build. It's a private library, unusable by out-of-tree software. etc/defaults/rc.conf By default, set zfsd_enable to NO etc/mtree/BSD.include.dist Add a directory for libdevdctl's include files etc/mtree/BSD.tests.dist Add a directory for zfsd's unit tests etc/mtree/BSD.var.dist Add /var/db/zfsd/cases, where zfsd stores case files while it's shut down. etc/rc.d/Makefile etc/rc.d/zfsd Add zfsd's rc script sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c Fix the resource.fs.zfs.statechange message. It had a number of problems: It was only being emitted on a transition to the HEALTHY state. That made it impossible for zfsd to take actions based on drives getting sicker. It compared the new state to vdev_prevstate, which is the state that the vdev had the last time it was opened. That doesn't make sense, because a vdev can change state multiple times without being reopened. vdev_set_state contains logic that will change the device's new state based on various conditions. However, the statechange event was being posted _before_ that logic took effect. Now it's being posted after. Submitted by: gibbs, asomers, mav, allanjude Reviewed by: mav, delphij Relnotes: yes Sponsored by: Spectra Logic Corp, iX Systems Differential Revision: https://reviews.freebsd.org/D6564
Notes
Notes: svn path=/head/; revision=300906
Diffstat (limited to 'cddl/usr.sbin/zfsd/callout.cc')
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diff --git a/cddl/usr.sbin/zfsd/callout.cc b/cddl/usr.sbin/zfsd/callout.cc
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+/*-
+ * Copyright (c) 2011, 2012, 2013 Spectra Logic Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ * Authors: Justin T. Gibbs (Spectra Logic Corporation)
+ *
+ * $FreeBSD$
+ */
+
+/**
+ * \file callout.cc
+ *
+ * \brief Implementation of the Callout class - multi-client
+ * timer services built on top of the POSIX interval timer.
+ */
+
+#include <sys/time.h>
+
+#include <signal.h>
+#include <syslog.h>
+
+#include <climits>
+#include <list>
+#include <map>
+#include <string>
+
+#include <devdctl/guid.h>
+#include <devdctl/event.h>
+#include <devdctl/event_factory.h>
+#include <devdctl/consumer.h>
+#include <devdctl/exception.h>
+
+#include "callout.h"
+#include "vdev_iterator.h"
+#include "zfsd.h"
+#include "zfsd_exception.h"
+
+std::list<Callout *> Callout::s_activeCallouts;
+bool Callout::s_alarmFired(false);
+
+void
+Callout::Init()
+{
+ signal(SIGALRM, Callout::AlarmSignalHandler);
+}
+
+bool
+Callout::Stop()
+{
+ if (!IsPending())
+ return (false);
+
+ for (std::list<Callout *>::iterator it(s_activeCallouts.begin());
+ it != s_activeCallouts.end(); it++) {
+ if (*it != this)
+ continue;
+
+ it = s_activeCallouts.erase(it);
+ if (it != s_activeCallouts.end()) {
+
+ /*
+ * Maintain correct interval for the
+ * callouts that follow the just removed
+ * entry.
+ */
+ timeradd(&(*it)->m_interval, &m_interval,
+ &(*it)->m_interval);
+ }
+ break;
+ }
+ m_pending = false;
+ return (true);
+}
+
+bool
+Callout::Reset(const timeval &interval, CalloutFunc_t *func, void *arg)
+{
+ bool cancelled(false);
+
+ if (!timerisset(&interval))
+ throw ZfsdException("Callout::Reset: interval of 0");
+
+ cancelled = Stop();
+
+ m_interval = interval;
+ m_func = func;
+ m_arg = arg;
+ m_pending = true;
+
+ std::list<Callout *>::iterator it(s_activeCallouts.begin());
+ for (; it != s_activeCallouts.end(); it++) {
+
+ if (timercmp(&(*it)->m_interval, &m_interval, <=)) {
+ /*
+ * Decrease our interval by those that come
+ * before us.
+ */
+ timersub(&m_interval, &(*it)->m_interval, &m_interval);
+ } else {
+ /*
+ * Account for the time between the newly
+ * inserted event and those that follow.
+ */
+ timersub(&(*it)->m_interval, &m_interval,
+ &(*it)->m_interval);
+ break;
+ }
+ }
+ s_activeCallouts.insert(it, this);
+
+
+ if (s_activeCallouts.front() == this) {
+ itimerval timerval = { {0, 0}, m_interval };
+
+ setitimer(ITIMER_REAL, &timerval, NULL);
+ }
+
+ return (cancelled);
+}
+
+void
+Callout::AlarmSignalHandler(int)
+{
+ s_alarmFired = true;
+ ZfsDaemon::WakeEventLoop();
+}
+
+void
+Callout::ExpireCallouts()
+{
+ if (!s_alarmFired)
+ return;
+
+ s_alarmFired = false;
+ if (s_activeCallouts.empty()) {
+ /* Callout removal/SIGALRM race was lost. */
+ return;
+ }
+
+ /*
+ * Expire the first callout (the one we used to set the
+ * interval timer) as well as any callouts following that
+ * expire at the same time (have a zero interval from
+ * the callout before it).
+ */
+ do {
+ Callout *cur(s_activeCallouts.front());
+ s_activeCallouts.pop_front();
+ cur->m_pending = false;
+ cur->m_func(cur->m_arg);
+ } while (!s_activeCallouts.empty()
+ && timerisset(&s_activeCallouts.front()->m_interval) == 0);
+
+ if (!s_activeCallouts.empty()) {
+ Callout *next(s_activeCallouts.front());
+ itimerval timerval = { { 0, 0 }, next->m_interval };
+
+ setitimer(ITIMER_REAL, &timerval, NULL);
+ }
+}
+
+timeval
+Callout::TimeRemaining() const
+{
+ /*
+ * Outline: Add the m_interval for each callout in s_activeCallouts
+ * ahead of this, except for the first callout. Add to that the result
+ * of getitimer (That's because the first callout stores its original
+ * interval setting while the timer is ticking).
+ */
+ itimerval timervalToAlarm;
+ timeval timeToExpiry;
+ std::list<Callout *>::iterator it;
+
+ if (!IsPending()) {
+ timeToExpiry.tv_sec = INT_MAX;
+ timeToExpiry.tv_usec = 999999; /*maximum normalized value*/
+ return (timeToExpiry);
+ }
+
+ timerclear(&timeToExpiry);
+ getitimer(ITIMER_REAL, &timervalToAlarm);
+ timeval& timeToAlarm = timervalToAlarm.it_value;
+ timeradd(&timeToExpiry, &timeToAlarm, &timeToExpiry);
+
+ it =s_activeCallouts.begin();
+ it++; /*skip the first callout in the list*/
+ for (; it != s_activeCallouts.end(); it++) {
+ timeradd(&timeToExpiry, &(*it)->m_interval, &timeToExpiry);
+ if ((*it) == this)
+ break;
+ }
+ return (timeToExpiry);
+}