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, 138 insertions, 0 deletions

diff --git a/lib/libdevdctl/tests/libdevdctl_unittest.cc b/lib/libdevdctl/tests/libdevdctl_unittest.cc
new file mode 100644
index 000000000000..4f69cb6522be
--- /dev/null
+++ b/lib/libdevdctl/tests/libdevdctl_unittest.cc
@@ -0,0 +1,138 @@
+/*-
+ * Copyright (c) 2016 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: Alan Somers         (Spectra Logic Corporation)
+ *
+ * $FreeBSD$
+ */
+
+#include <gtest/gtest.h>
+
+#include <list>
+#include <map>
+#include <string>
+
+#include <devdctl/guid.h>
+#include <devdctl/event.h>
+#include <devdctl/event_factory.h>
+
+using namespace DevdCtl;
+using namespace std;
+using namespace testing;
+
+#define REGISTRY_SIZE 2
+
+struct DevNameTestParams
+{
+	const char* evs;
+	bool is_disk;
+	const char* devname;
+};
+
+class DevNameTest : public TestWithParam<DevNameTestParams>{
+protected:
+	virtual void SetUp()
+	{
+		m_factory = new EventFactory();
+		m_factory->UpdateRegistry(s_registry, REGISTRY_SIZE);
+	}
+
+	virtual void TearDown()
+	{
+		if (m_ev) delete m_ev;
+		if (m_factory) delete m_factory;
+	}
+
+	EventFactory *m_factory;
+	Event *m_ev;
+	static EventFactory::Record s_registry[REGISTRY_SIZE];
+};
+
+DevdCtl::EventFactory::Record DevNameTest::s_registry[REGISTRY_SIZE] = {
+	{ Event::NOTIFY, "DEVFS", &DevfsEvent::Builder },
+	{ Event::NOTIFY, "GEOM", &GeomEvent::Builder }
+};
+
+TEST_P(DevNameTest, TestDevname) {
+	std::string devname;
+	DevNameTestParams param = GetParam();
+	
+	string evString(param.evs);
+	m_ev = Event::CreateEvent(*m_factory, evString);
+	m_ev->DevName(devname);
+	EXPECT_STREQ(param.devname, devname.c_str());
+}
+
+TEST_P(DevNameTest, TestIsDiskDev) {
+	DevNameTestParams param = GetParam();
+
+	string evString(param.evs);
+	m_ev = Event::CreateEvent(*m_factory, evString);
+	EXPECT_EQ(param.is_disk, m_ev->IsDiskDev());
+}
+
+/* TODO: clean this up using C++-11 uniform initializers */
+INSTANTIATE_TEST_CASE_P(IsDiskDevTestInstantiation, DevNameTest, Values(
+	(DevNameTestParams){
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=da6\n",
+		.is_disk = true, .devname = "da6"},
+	(DevNameTestParams){.is_disk = false, .devname = "cuau0",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=cuau0\n"},
+	(DevNameTestParams){.is_disk = true, .devname = "ada6",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=ada6\n"},
+	(DevNameTestParams){.is_disk = true, .devname = "da6p1",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=da6p1\n"},
+	(DevNameTestParams){.is_disk = true, .devname = "ada6p1",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=ada6p1\n"},
+	(DevNameTestParams){.is_disk = true, .devname = "da6s0p1",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=da6s0p1\n"},
+	(DevNameTestParams){.is_disk = true, .devname = "ada6s0p1",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=ada6s0p1\n"},
+	/* 
+	 * Test physical path nodes.  These are currently all set to false since
+	 * physical path nodes are implemented with symlinks, and most CAM and
+	 * ZFS operations can't use symlinked device nodes
+	 */
+	/* A SpectraBSD-style physical path node*/
+	(DevNameTestParams){.is_disk = false, .devname = "enc@50030480019f53fd/elmtype@array_device/slot@18/da",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=enc@50030480019f53fd/elmtype@array_device/slot@18/da\n"},
+	(DevNameTestParams){.is_disk = false, .devname = "enc@50030480019f53fd/elmtype@array_device/slot@18/pass",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=enc@50030480019f53fd/elmtype@array_device/slot@18/pass\n"},
+	/* A FreeBSD-style physical path node */
+	(DevNameTestParams){.is_disk = true, .devname = "enc@n50030480019f53fd/type@0/slot@18/elmdesc@ArrayDevice18/da6",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=enc@n50030480019f53fd/type@0/slot@18/elmdesc@ArrayDevice18/da6\n"},
+	(DevNameTestParams){.is_disk = false, .devname = "enc@n50030480019f53fd/type@0/slot@18/elmdesc@ArrayDevice18/pass6",
+		.evs = "!system=DEVFS subsystem=CDEV type=CREATE cdev=enc@n50030480019f53fd/type@0/slot@18/elmdesc@ArrayDevice18/pass6\n"},
+	
+	/*
+	 * Test some GEOM events
+	 */
+	(DevNameTestParams){.is_disk = true, .devname = "da5",
+		.evs = "!system=GEOM subsystem=disk type=GEOM::physpath devname=da5\n"})
+);