Allow 'zpool events' filtering by pool name

Additionally add four new tests:

 * zpool_events_clear: verify 'zpool events -c' functionality
 * zpool_events_cliargs: verify command line options and arguments
 * zpool_events_follow: verify 'zpool events -f'
 * zpool_events_poolname: verify events filtering by pool name

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #3285 
Closes #6762

cmd/zpool/zpool_main.c

@@ -354,7 +354,7 @@ get_usage(zpool_help_t idx)
 		    "\tupgrade -v\n"
 		    "\tupgrade [-V version] <-a | pool ...>\n"));
 	case HELP_EVENTS:
-		return (gettext("\tevents [-vHfc]\n"));
+		return (gettext("\tevents [-vHf [pool] | -c]\n"));
 	case HELP_GET:
 		return (gettext("\tget [-Hp] [-o \"all\" | field[,...]] "
 		    "<\"all\" | property[,...]> <pool> ...\n"));
@@ -7376,6 +7376,7 @@ typedef struct ev_opts {
 	int scripted;
 	int follow;
 	int clear;
+	char poolname[ZFS_MAX_DATASET_NAME_LEN];
 } ev_opts_t;
 
 static void
@@ -7643,6 +7644,7 @@ zpool_do_events_next(ev_opts_t *opts)
 {
 	nvlist_t *nvl;
 	int zevent_fd, ret, dropped;
+	char *pool;
 
 	zevent_fd = open(ZFS_DEV, O_RDWR);
 	VERIFY(zevent_fd >= 0);
@@ -7659,6 +7661,11 @@ zpool_do_events_next(ev_opts_t *opts)
 		if (dropped > 0)
 			(void) printf(gettext("dropped %d events\n"), dropped);
 
+		if (strlen(opts->poolname) > 0 &&
+		    nvlist_lookup_string(nvl, FM_FMRI_ZFS_POOL, &pool) == 0 &&
+		    strcmp(opts->poolname, pool) != 0)
+			continue;
+
 		zpool_do_events_short(nvl, opts);
 
 		if (opts->verbose) {
@@ -7688,7 +7695,7 @@ zpool_do_events_clear(ev_opts_t *opts)
 }
 
 /*
- * zpool events [-vfc]
+ * zpool events [-vHf [pool] | -c]
  *
  * Displays events logs by ZFS.
  */
@@ -7723,6 +7730,25 @@ zpool_do_events(int argc, char **argv)
 	argc -= optind;
 	argv += optind;
 
+	if (argc > 1) {
+		(void) fprintf(stderr, gettext("too many arguments\n"));
+		usage(B_FALSE);
+	} else if (argc == 1) {
+		(void) strlcpy(opts.poolname, argv[0], sizeof (opts.poolname));
+		if (!zfs_name_valid(opts.poolname, ZFS_TYPE_POOL)) {
+			(void) fprintf(stderr,
+			    gettext("invalid pool name '%s'\n"), opts.poolname);
+			usage(B_FALSE);
+		}
+	}
+
+	if ((argc == 1 || opts.verbose || opts.scripted || opts.follow) &&
+	    opts.clear) {
+		(void) fprintf(stderr,
+		    gettext("invalid options combined with -c\n"));
+		usage(B_FALSE);
+	}
+
 	if (opts.clear)
 		ret = zpool_do_events_clear(&opts);
 	else

configure.ac

@@ -214,6 +214,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/tests/functional/cli_root/zpool_create/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zpool_destroy/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zpool_detach/Makefile
+	tests/zfs-tests/tests/functional/cli_root/zpool_events/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zpool_expand/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zpool_export/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zpool_get/Makefile

man/man8/zpool.8

@@ -68,8 +68,7 @@
 .Ar pool device
 .Nm
 .Cm events
-.Op Fl vHfc
-.Op Ar pool
+.Op Fl vHf Oo Ar pool Oc | Fl c
 .Nm
 .Cm export
 .Op Fl a
@@ -1027,8 +1026,7 @@ command instead.
 .It Xo
 .Nm
 .Cm events
-.Op Fl cfHv
-.Op Ar pool Ns ...
+.Op Fl vHf Oo Ar pool Oc | Fl c
 .Xc
 Lists all recent events generated by the ZFS kernel modules.  These events
 are consumed by the

tests/runfiles/linux.run

@@ -252,6 +252,10 @@ post =
 [tests/functional/cli_root/zpool_detach]
 tests = ['zpool_detach_001_neg']
 
+[tests/functional/cli_root/zpool_events]
+tests = ['zpool_events_clear', 'zpool_events_cliargs', 'zpool_events_follow',
+    'zpool_events_poolname']
+
 [tests/functional/cli_root/zpool_expand]
 tests = ['zpool_expand_001_pos', 'zpool_expand_002_pos',
     'zpool_expand_003_neg', 'zpool_expand_004_pos']

tests/zfs-tests/tests/functional/cli_root/Makefile.am

@@ -37,6 +37,7 @@ SUBDIRS = \
 	zpool_create \
 	zpool_destroy \
 	zpool_detach \
+	zpool_events \
 	zpool_expand \
 	zpool_export \
 	zpool_get \

tests/zfs-tests/tests/functional/cli_root/zpool_events/Makefile.am

@@ -0,0 +1,10 @@
+pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/cli_root/zpool_events
+dist_pkgdata_SCRIPTS = \
+	setup.ksh \
+	cleanup.ksh \
+	zpool_events.cfg \
+	zpool_events.kshlib \
+	zpool_events_clear.ksh \
+	zpool_events_cliargs.ksh \
+	zpool_events_follow.ksh \
+	zpool_events_poolname.ksh

tests/zfs-tests/tests/functional/cli_root/zpool_events/cleanup.ksh

@@ -0,0 +1,19 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+default_cleanup

tests/zfs-tests/tests/functional/cli_root/zpool_events/setup.ksh

@@ -0,0 +1,21 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+DISK=${DISKS%% *}
+
+default_volume_setup $DISK

tests/zfs-tests/tests/functional/cli_root/zpool_events/zpool_events.cfg

@@ -0,0 +1,17 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+export EVENTS_NUM=42

tests/zfs-tests/tests/functional/cli_root/zpool_events/zpool_events.kshlib

@@ -0,0 +1,40 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zpool_events/zpool_events.cfg
+
+#
+# Wait to allow the kernel module to process ZFS events until we reach $eventnum
+# or a timeout of $timeout seconds expire, whichever comes first
+#
+function zpool_events_settle # <eventnum> [timeout]
+{
+	typeset eventnum="${1:-$EVENTS_NUM}"
+	typeset timeout="${2:-3}"
+	typeset -i count
+	typeset -i i=0
+
+	while [[ $i -lt $timeout ]]; do
+		count=$(zpool events -H | wc -l)
+		if [[ $count -ge $eventnum ]]; then
+			break
+		fi
+		i=$((i+1))
+		sleep 1
+	done
+	log_note "waited $i seconds"
+}

tests/zfs-tests/tests/functional/cli_root/zpool_events/zpool_events_clear.ksh

@@ -0,0 +1,58 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zpool_events/zpool_events.kshlib
+
+#
+# DESCRIPTION:
+# 'zpool events -c' should successfully clear events.
+#
+# STRATEGY:
+# 1. Clear all ZFS events
+# 2. Generate some new ZFS events
+# 3. Verify 'zpool events -c' successfully clears new events
+#
+
+verify_runnable "both"
+
+log_assert "'zpool events -c' should successfully clear events."
+
+# 1. Clear all ZFS events
+# This is needed because we may already over the max number or events queued
+# (zfs_zevent_len_max) generated by previous tests: generating $EVENTS_NUM new
+# events and then counting them is racy and leads to failues, so start from 0.
+log_must zpool events -c
+
+# 2. Generate some new ZFS events
+for i in `seq 1 $EVENTS_NUM`; do
+	log_must zpool clear $TESTPOOL
+done
+# wait a bit to allow the kernel module to process new events
+zpool_events_settle
+EVENTS_NUM="$(zpool events -H | wc -l)"
+
+# 3. Verify 'zpool events -c' successfully clear new events
+CLEAR_OUTPUT="$(zpool events -c)"
+if [[ "$CLEAR_OUTPUT" != "cleared $EVENTS_NUM events" ]]; then
+	log_fail "Failed to clear $EVENTS_NUM events: $CLEAR_OUTPUT"
+fi
+EVENTS_NUM="$(zpool events -H | wc -l)"
+if [[ $EVENTS_NUM -ne 0 ]];  then
+	log_fail "Unexpected events number: $EVENTS_NUM != 0"
+fi
+
+log_pass "'zpool events -c' successfully clears events."

tests/zfs-tests/tests/functional/cli_root/zpool_events/zpool_events_cliargs.ksh

@@ -0,0 +1,89 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# 'zpool events' should only work with supported options.
+#
+# STRATEGY:
+# 1. Verify every supported option is accepted
+# 2. Verify supported options raise an error with unsupported arguments
+# 3. Verify other unsupported options raise an error
+#
+
+verify_runnable "both"
+
+function log_must_follow # <command>
+{
+	typeset command="$1"
+
+	log_must eval "$command > /dev/null &"
+	pid=$!
+	sleep 3
+	kill $pid
+	if [[ $? -ne 0 ]]; then
+		log_fail "'$command' does not work as expected."
+	else
+		log_note "'$command' works successfully."
+	fi
+}
+
+log_assert "'zpool events' should only work with supported options."
+
+typeset goodopts=("" "-v" "-H" "-f" "-vH" "-vf" "-Hf" "-vHf")
+typeset badopts=("-vV" "-Hh" "-fF" "-cC" "-x" "-o" "-")
+
+# 1. Verify every supported option is accepted
+for opt in ${goodopts[@]}
+do
+	# when in 'follow' mode we can't use log_must()
+	if [[ $opt =~ 'f' ]]; then
+		log_must_follow "zpool events $opt"
+		log_must_follow "zpool events $opt $TESTPOOL"
+	else
+		log_must eval "zpool events $opt > /dev/null"
+		log_must eval "zpool events $opt $TESTPOOL > /dev/null"
+	fi
+done
+
+# 2.1 Verify supported options raise an error with unsupported arguments
+for opt in ${goodopts[@]}
+do
+	log_mustnot zpool events $opt "/tmp/"
+	log_mustnot zpool events $opt "$TESTPOOL/fs"
+	log_mustnot zpool events $opt "$TESTPOOL@snap"
+	log_mustnot zpool events $opt "$TESTPOOL#bm"
+	log_mustnot zpool events $opt "$TESTPOOL" "$TESTPOOL"
+done
+
+# 2.2 Additionally, 'zpool events -c' does not support any other option|argument
+log_must eval "zpool events -c > /dev/null"
+log_mustnot zpool events -c "$TESTPOOL"
+for opt in ${goodopts[@]}
+do
+	log_mustnot zpool events -c $opt
+done
+
+# 3. Verify other unsupported options raise an error
+for opt in ${badopts[@]}
+do
+	log_mustnot zpool events $opt
+	log_mustnot zpool events $opt "$TESTPOOL"
+done
+
+log_pass "'zpool events' only works with supported options."

tests/zfs-tests/tests/functional/cli_root/zpool_events/zpool_events_follow.ksh

@@ -0,0 +1,64 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zpool_events/zpool_events.kshlib
+
+#
+# DESCRIPTION:
+# 'zpool events -f' should successfully follow new events.
+#
+# STRATEGY:
+# 1. Clear all ZFS events
+# 2. Run 'zpool events -f' in background, saving its output to a temporary file
+# 3. Generate some ZFS events
+# 4. Verify 'zpool events -f' successfully recorded these new events
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	[[ -n $pid ]] && kill $pid 2>/dev/null
+	rm -f $EVENTS_FILE
+}
+
+log_assert "'zpool events -f' should follow new events."
+log_onexit cleanup
+
+EVENTS_FILE="$TESTDIR/zpool_events.$$"
+
+# 1. Clear all ZFS events
+log_must zpool events -c
+
+# 2. Run 'zpool events -f' in background, saving its output to a temporary file
+log_must eval "zpool events -H -f > $EVENTS_FILE &"
+pid=$!
+
+# 3. Generate some ZFS events
+for i in `seq 1 $EVENTS_NUM`; do
+	log_must zpool clear $TESTPOOL
+done
+# wait a bit to allow the kernel module to process new events
+zpool_events_settle
+
+# 4. Verify 'zpool events -f' successfully recorded these new events
+EVENTS_LOG="$(cat $EVENTS_FILE | wc -l)"
+if [[ "$EVENTS_LOG" != "$EVENTS_NUM" ]]; then
+	log_fail "Unexpected number of events: $EVENTS_LOG != $EVENTS_NUM"
+fi
+
+log_pass "'zpool events -f' successfully follows new events."

tests/zfs-tests/tests/functional/cli_root/zpool_events/zpool_events_poolname.ksh

@@ -0,0 +1,74 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zpool_events/zpool_events.kshlib
+
+#
+# DESCRIPTION:
+# 'zpool events poolname' should only display events from the chosen pool.
+#
+# STRATEGY:
+# 1. Create an additional pool
+# 2. Clear all ZFS events
+# 3. Generate some ZFS events on both pools
+# 4. Verify 'zpool events poolname' successfully display events
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	destroy_pool $NEWPOOL
+	rm -f $DISK
+}
+
+log_assert "'zpool events poolname' should only display events from poolname."
+log_onexit cleanup
+
+NEWPOOL="newpool"
+DISK="$TEST_BASE_DIR/$NEWPOOL.dat"
+
+# 1. Create an additional pool
+log_must truncate -s $MINVDEVSIZE $DISK
+log_must zpool create $NEWPOOL $DISK
+
+# 2. Clear all ZFS events
+log_must zpool events -c
+
+# 3. Generate some ZFS events on both pools
+for i in `seq 1 $EVENTS_NUM`; do
+	log_must zpool clear $TESTPOOL
+done
+for i in `seq 1 $EVENTS_NUM`; do
+	log_must zpool clear $NEWPOOL
+done
+# wait a bit to allow the kernel module to process new events
+zpool_events_settle
+
+# 4. Verify 'zpool events poolname' successfully display events
+zpool events -v $TESTPOOL |
+   awk -v POOL=$TESTPOOL '/pool = / {if ($3 != "\""POOL"\"") exit 1}'
+if [[ $? -ne 0 ]]; then
+	log_fail "Unexpected events for pools other than $TESTPOOL"
+fi
+zpool events -v $NEWPOOL |
+   awk -v POOL=$NEWPOOL '/pool = / {if ($3 != "\""POOL"\"") exit 1}'
+if [[ $? -ne 0 ]]; then
+	log_fail "Unexpected events for pools other than $NEWPOOL"
+fi
+
+log_pass "'zpool events poolname' display events only from the chosen pool."

tests/zfs-tests/tests/functional/fault/auto_online_001_pos.ksh

@@ -111,7 +111,7 @@ do
 	fi
 
 	# Clear zpool events
-	zpool events -c $TESTPOOL
+	log_must zpool events -c
 
 	# Online disk
 	insert_disk $offline_disk $host

tests/zfs-tests/tests/functional/fault/auto_replace_001_pos.ksh

@@ -122,7 +122,7 @@ if (($? != 0)); then
 fi
 
 # Clear zpool events
-zpool events -c $TESTPOOL
+log_must zpool events -c
 
 # Create another scsi_debug device
 setup