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

1 files changed, 125 insertions, 0 deletions

diff --git a/lib/libdevdctl/exception.cc b/lib/libdevdctl/exception.cc
new file mode 100644
index 0000000..4dc8cf5
--- /dev/null
+++ b/lib/libdevdctl/exception.cc
@@ -0,0 +1,125 @@
+/*-
+ * Copyright (c) 2011, 2012, 2013, 2014 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)
+ */
+
+/**
+ * \file exception.cc
+ */
+#include <sys/cdefs.h>
+
+#include <syslog.h>
+
+#include <cstdio>
+#include <cstdarg>
+#include <sstream>
+#include <string>
+
+#include "exception.h"
+
+__FBSDID("$FreeBSD$");
+
+/*============================ Namespace Control =============================*/
+using std::string;
+using std::stringstream;
+using std::endl;
+namespace DevdCtl
+{
+
+/*=========================== Class Implementations ==========================*/
+/*--------------------------------- Exception --------------------------------*/
+void
+Exception::FormatLog(const char *fmt, va_list ap)
+{
+	char buf[256];
+
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	m_log = buf;
+}
+
+Exception::Exception(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	FormatLog(fmt, ap);
+	va_end(ap);
+}
+
+Exception::Exception()
+{
+}
+
+void
+Exception::Log() const
+{
+	syslog(LOG_ERR, "%s", m_log.c_str());
+}
+
+/*------------------------------ ParseException ------------------------------*/
+//- ParseException Inline Public Methods ---------------------------------------
+ParseException::ParseException(Type type, const std::string &parsedBuffer,
+			       size_t offset)
+ : Exception(),
+   m_type(type),
+   m_parsedBuffer(parsedBuffer),
+   m_offset(offset)
+{
+        stringstream logstream;
+
+        logstream << "Parsing ";
+
+        switch (Type()) {
+        case INVALID_FORMAT:
+                logstream << "invalid format ";
+                break;
+        case DISCARDED_EVENT_TYPE:
+                logstream << "discarded event ";
+                break;
+        case UNKNOWN_EVENT_TYPE:
+                logstream << "unknown event ";
+                break;
+        default:
+                break;
+        }
+        logstream << "exception on buffer: \'";
+        if (GetOffset() == 0) {
+                logstream << m_parsedBuffer << '\'' << endl;
+        } else {
+                string markedBuffer(m_parsedBuffer);
+
+                markedBuffer.insert(GetOffset(), "<HERE-->");
+                logstream << markedBuffer << '\'' << endl;
+        }
+
+	GetString() = logstream.str();
+}
+
+} // namespace DevdCtl