Initial implementation of zed (ZFS Event Daemon)

zed monitors ZFS events.  When a zevent is posted, zed will run any
scripts that have been enabled for the corresponding zevent class.
Multiple scripts may be invoked for a given zevent.  The zevent
nvpairs are passed to the scripts as environment variables.

Events are processed synchronously by the single thread, and there is
no maximum timeout for script execution.  Consequently, a misbehaving
script can delay (or forever block) the processing of subsequent
zevents.  Plans are to address this in future commits.

Initial scripts have been developed to log events to syslog
and send email in response to checksum/data/io errors and
resilver.finish/scrub.finish events.  By default, email will only
be sent if the ZED_EMAIL variable is configured in zed.rc (which is
serving as a config file of sorts until a proper configuration file
is implemented).

Signed-off-by: Chris Dunlap <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Issue #2

1 files changed, 71 insertions, 0 deletions

diff --git a/cmd/zed/zed_conf.h b/cmd/zed/zed_conf.h
new file mode 100644
index 000000000..51b98ea76
--- /dev/null
+++ b/cmd/zed/zed_conf.h
@@ -0,0 +1,71 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license from the top-level
+ * OPENSOLARIS.LICENSE or <http://opensource.org/licenses/CDDL-1.0>.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each file
+ * and include the License file from the top-level OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Developed at Lawrence Livermore National Laboratory (LLNL-CODE-403049).
+ * Copyright (C) 2013-2014 Lawrence Livermore National Security, LLC.
+ */
+
+#ifndef	ZED_CONF_H
+#define	ZED_CONF_H
+
+#include <libzfs.h>
+#include <stdint.h>
+#include "zed_strings.h"
+
+struct zed_conf {
+	unsigned	do_force:1;		/* true if force enabled */
+	unsigned	do_foreground:1;	/* true if run in foreground */
+	unsigned	do_memlock:1;		/* true if locking memory */
+	unsigned	do_verbose:1;		/* true if verbosity enabled */
+	unsigned	do_zero:1;		/* true if zeroing state */
+	int		syslog_facility;	/* syslog facility value */
+	int		min_events;		/* RESERVED FOR FUTURE USE */
+	int		max_events;		/* RESERVED FOR FUTURE USE */
+	char		*conf_file;		/* abs path to config file */
+	char		*pid_file;		/* abs path to pid file */
+	char		*script_dir;		/* abs path to script dir */
+	zed_strings_t	*scripts;		/* names of enabled scripts */
+	char		*state_file;		/* abs path to state file */
+	int		state_fd;		/* fd to state file */
+	libzfs_handle_t	*zfs_hdl;		/* handle to libzfs */
+	int		zevent_fd;		/* fd for access to zevents */
+};
+
+struct zed_conf *zed_conf_create(void);
+
+void zed_conf_destroy(struct zed_conf *zcp);
+
+void zed_conf_parse_opts(struct zed_conf *zcp, int argc, char **argv);
+
+void zed_conf_parse_file(struct zed_conf *zcp);
+
+int zed_conf_scan_dir(struct zed_conf *zcp);
+
+int zed_conf_write_pid(struct zed_conf *zcp);
+
+int zed_conf_open_state(struct zed_conf *zcp);
+
+int zed_conf_read_state(struct zed_conf *zcp, uint64_t *eidp, int64_t etime[]);
+
+int zed_conf_write_state(struct zed_conf *zcp, uint64_t eid, int64_t etime[]);
+
+#endif	/* !ZED_CONF_H */