Please welcome HAST - Highly Avalable Storage.

HAST allows to transparently store data on two physically separated machines
connected over the TCP/IP network. HAST works in Primary-Secondary
(Master-Backup, Master-Slave) configuration, which means that only one of the
cluster nodes can be active at any given time. Only Primary node is able to
handle I/O requests to HAST-managed devices. Currently HAST is limited to two
cluster nodes in total.

HAST operates on block level - it provides disk-like devices in /dev/hast/
directory for use by file systems and/or applications. Working on block level
makes it transparent for file systems and applications. There in no difference
between using HAST-provided device and raw disk, partition, etc. All of them
are just regular GEOM providers in FreeBSD.

For more information please consult hastd(8), hastctl(8) and hast.conf(5)
manual pages, as well as http://wiki.FreeBSD.org/HAST.

Sponsored by:	FreeBSD Foundation
Sponsored by:	OMCnet Internet Service GmbH
Sponsored by:	TransIP BV

1 files changed, 367 insertions, 0 deletions

diff --git a/sbin/hastd/pjdlog.c b/sbin/hastd/pjdlog.c
new file mode 100644
index 0000000..38c5539
--- /dev/null
+++ b/sbin/hastd/pjdlog.c
@@ -0,0 +1,367 @@
+/*-
+ * Copyright (c) 2009-2010 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Pawel Jakub Dawidek under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <assert.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+
+#include "pjdlog.h"
+
+static int pjdlog_mode = PJDLOG_MODE_STD;
+static int pjdlog_debug_level = 0;
+static char pjdlog_prefix[128];
+
+/*
+ * Configure where the logs should go.
+ * By default they are send to stdout/stderr, but after going into background
+ * (eg. by calling daemon(3)) application is responsible for changing mode to
+ * PJDLOG_MODE_SYSLOG, so logs will be send to syslog.
+ */
+void
+pjdlog_mode_set(int mode)
+{
+
+	assert(mode == PJDLOG_MODE_STD || mode == PJDLOG_MODE_SYSLOG);
+
+	pjdlog_mode = mode;
+}
+
+/*
+ * Return current mode.
+ */
+int
+pjdlog_mode_get(void)
+{
+
+	return (pjdlog_mode);
+}
+
+/*
+ * Set debug level. All the logs above the level specified here will be
+ * ignored.
+ */
+void
+pjdlog_debug_set(int level)
+{
+
+	assert(level >= 0);
+
+	pjdlog_debug_level = level;
+}
+
+/*
+ * Return current debug level.
+ */
+int
+pjdlog_debug_get(void)
+{
+
+	return (pjdlog_debug_level);
+}
+
+/*
+ * Set prefix that will be used before each log.
+ * Setting prefix to NULL will remove it.
+ */
+void
+pjdlog_prefix_set(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	pjdlog_prefix_setv(fmt, ap);
+	va_end(ap);
+}
+
+/*
+ * Set prefix that will be used before each log.
+ * Setting prefix to NULL will remove it.
+ */
+void
+pjdlog_prefix_setv(const char *fmt, va_list ap)
+{
+
+	assert(fmt != NULL);
+
+	vsnprintf(pjdlog_prefix, sizeof(pjdlog_prefix), fmt, ap);
+}
+
+/*
+ * Convert log level into string.
+ */
+static const char *
+pjdlog_level_string(int loglevel)
+{
+
+	switch (loglevel) {
+	case LOG_EMERG:
+		return ("EMERG");
+	case LOG_ALERT:
+		return ("ALERT");
+	case LOG_CRIT:
+		return ("CRIT");
+	case LOG_ERR:
+		return ("ERROR");
+	case LOG_WARNING:
+		return ("WARNING");
+	case LOG_NOTICE:
+		return ("NOTICE");
+	case LOG_INFO:
+		return ("INFO");
+	case LOG_DEBUG:
+		return ("DEBUG");
+	}
+	assert(!"Invalid log level.");
+	abort();	/* XXX: gcc */
+}
+
+/*
+ * Common log routine.
+ */
+void
+pjdlog_common(int loglevel, int debuglevel, int error, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	pjdlogv_common(loglevel, debuglevel, error, fmt, ap);
+	va_end(ap);
+}
+
+/*
+ * Common log routine, which can handle regular log level as well as debug
+ * level. We decide here where to send the logs (stdout/stderr or syslog).
+ */
+void
+pjdlogv_common(int loglevel, int debuglevel, int error, const char *fmt,
+    va_list ap)
+{
+
+	assert(loglevel == LOG_EMERG || loglevel == LOG_ALERT ||
+	    loglevel == LOG_CRIT || loglevel == LOG_ERR ||
+	    loglevel == LOG_WARNING || loglevel == LOG_NOTICE ||
+	    loglevel == LOG_INFO || loglevel == LOG_DEBUG);
+	assert(loglevel != LOG_DEBUG || debuglevel > 0);
+	assert(error >= -1);
+
+	/* Ignore debug above configured level. */
+	if (loglevel == LOG_DEBUG && debuglevel > pjdlog_debug_level)
+		return;
+
+	switch (pjdlog_mode) {
+	case PJDLOG_MODE_STD:
+	    {
+		FILE *out;
+
+		/*
+		 * We send errors and warning to stderr and the rest to stdout.
+		 */
+		switch (loglevel) {
+		case LOG_EMERG:
+		case LOG_ALERT:
+		case LOG_CRIT:
+		case LOG_ERR:
+		case LOG_WARNING:
+			out = stderr;
+			break;
+		case LOG_NOTICE:
+		case LOG_INFO:
+		case LOG_DEBUG:
+			out = stdout;
+			break;
+		default:
+			assert(!"Invalid loglevel.");
+			abort();	/* XXX: gcc */
+		}
+
+		fprintf(out, "[%s]", pjdlog_level_string(loglevel));
+		/* Attach debuglevel if this is debug log. */
+		if (loglevel == LOG_DEBUG)
+			fprintf(out, "[%d]", debuglevel);
+		fprintf(out, " ");
+		fprintf(out, "%s", pjdlog_prefix);
+		vfprintf(out, fmt, ap);
+		if (error != -1)
+			fprintf(out, ": %s.", strerror(error));
+		fprintf(out, "\n");
+		break;
+	    }
+	case PJDLOG_MODE_SYSLOG:
+	    {
+		char log[1024];
+		int len;
+
+		len = snprintf(log, sizeof(log), "%s", pjdlog_prefix);
+		if ((size_t)len < sizeof(log))
+			len = vsnprintf(log + len, sizeof(log) - len, fmt, ap);
+		if (error != -1 && (size_t)len < sizeof(log)) {
+			(void)snprintf(log + len, sizeof(log) - len, ": %s.",
+			    strerror(error));
+		}
+		syslog(loglevel, "%s", log);
+		break;
+	    }
+	default:
+		assert(!"Invalid mode.");
+	}
+}
+
+/*
+ * Regular logs.
+ */
+void
+pjdlogv(int loglevel, const char *fmt, va_list ap)
+{
+
+	/* LOG_DEBUG is invalid here, pjdlogv?_debug() should be used. */
+	assert(loglevel == LOG_EMERG || loglevel == LOG_ALERT ||
+	    loglevel == LOG_CRIT || loglevel == LOG_ERR ||
+	    loglevel == LOG_WARNING || loglevel == LOG_NOTICE ||
+	    loglevel == LOG_INFO);
+
+	pjdlogv_common(loglevel, 0, -1, fmt, ap);
+}
+
+/*
+ * Regular logs.
+ */
+void
+pjdlog(int loglevel, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	pjdlogv(loglevel, fmt, ap);
+	va_end(ap);
+}
+
+/*
+ * Debug logs.
+ */
+void
+pjdlogv_debug(int debuglevel, const char *fmt, va_list ap)
+{
+
+	pjdlogv_common(LOG_DEBUG, debuglevel, -1, fmt, ap);
+}
+
+/*
+ * Debug logs.
+ */
+void
+pjdlog_debug(int debuglevel, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	pjdlogv_debug(debuglevel, fmt, ap);
+	va_end(ap);
+}
+
+/*
+ * Error logs with errno logging.
+ */
+void
+pjdlogv_errno(int loglevel, const char *fmt, va_list ap)
+{
+
+	pjdlogv_common(loglevel, 0, errno, fmt, ap);
+}
+
+/*
+ * Error logs with errno logging.
+ */
+void
+pjdlog_errno(int loglevel, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	pjdlogv_errno(loglevel, fmt, ap);
+	va_end(ap);
+}
+
+/*
+ * Log error, errno and exit.
+ */
+void
+pjdlogv_exit(int exitcode, const char *fmt, va_list ap)
+{
+
+	pjdlogv_errno(LOG_ERR, fmt, ap);
+	exit(exitcode);
+}
+
+/*
+ * Log error, errno and exit.
+ */
+void
+pjdlog_exit(int exitcode, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	pjdlogv_exit(exitcode, fmt, ap);
+	/* NOTREACHED */
+	va_end(ap);
+}
+
+/*
+ * Log error and exit.
+ */
+void
+pjdlogv_exitx(int exitcode, const char *fmt, va_list ap)
+{
+
+	pjdlogv(LOG_ERR, fmt, ap);
+	exit(exitcode);
+}
+
+/*
+ * Log error and exit.
+ */
+void
+pjdlog_exitx(int exitcode, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	pjdlogv_exitx(exitcode, fmt, ap);
+	/* NOTREACHED */
+	va_end(ap);
+}