ZTS: add zed_fd_spill to verify the fds ZEDLETs inherit

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11891

tests/runfiles/linux.run

@@ -90,7 +90,7 @@ tests = ['devices_001_pos', 'devices_002_neg', 'devices_003_pos']
 tags = ['functional', 'devices']
 
 [tests/functional/events:Linux]
-tests = ['events_001_pos', 'events_002_pos', 'zed_rc_filter']
+tests = ['events_001_pos', 'events_002_pos', 'zed_rc_filter', 'zed_fd_spill']
 tags = ['functional', 'events']
 
 [tests/functional/fallocate:Linux]

tests/zfs-tests/include/libtest.shlib

@@ -3577,16 +3577,11 @@ function wait_replacing #pool
 # Wait for a pool to be scrubbed
 #
 # $1 pool name
-# $2 number of seconds to wait (optional)
-#
-# Returns true when pool has been scrubbed, or false if there's a timeout or if
-# no scrub was done.
 #
 function wait_scrubbed
 {
 	typeset pool=${1:-$TESTPOOL}
-	while true ; do
+	while ! is_pool_scrubbed $pool ; do
-		is_pool_scrubbed $pool && break
 		sleep 1
 	done
 }

tests/zfs-tests/tests/functional/events/.gitignore

@@ -0,0 +1 @@
+/zed_fd_spill-zedlet

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

@@ -1,11 +1,18 @@
+include $(top_srcdir)/config/Rules.am
+
 pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/events
 dist_pkgdata_SCRIPTS = \
 	setup.ksh \
 	cleanup.ksh \
 	events_001_pos.ksh \
 	events_002_pos.ksh \
-	zed_rc_filter.ksh
+	zed_rc_filter.ksh \
+	zed_fd_spill.ksh
 
 dist_pkgdata_DATA = \
 	events.cfg \
 	events_common.kshlib
+
+pkgexecdir = $(pkgdatadir)
+pkgexec_PROGRAMS = zed_fd_spill-zedlet
+zed_fd_spill_zedlet_SOURCES = zed_fd_spill-zedlet.c

tests/zfs-tests/tests/functional/events/cleanup.ksh

@@ -26,6 +26,6 @@
 
 . $STF_SUITE/include/libtest.shlib
 
-zed_cleanup all-debug.sh all-syslog.sh
+zed_cleanup all-debug.sh all-syslog.sh all-dumpfds
 
 default_cleanup

tests/zfs-tests/tests/functional/events/events_002_pos.ksh

@@ -50,11 +50,11 @@ function cleanup
 		[[ -f $file ]] && rm -f $file
 	done
 
-	log_must rm -f $TMP_EVENTS_ZED $TMP_EVENTS_ZED
+	log_must rm -f $TMP_EVENTS_ZED
 	log_must zed_stop
 }
 
-log_assert "Verify ZED handles missed events on when starting"
+log_assert "Verify ZED handles missed events when starting"
 log_onexit cleanup
 
 log_must truncate -s $MINVDEVSIZE $VDEV1 $VDEV2

tests/zfs-tests/tests/functional/events/zed_fd_spill-zedlet.c

@@ -0,0 +1,36 @@
+/*
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+int main(void) {
+	if (fork()) {
+		int err;
+		wait(&err);
+		return (err);
+	}
+
+	char buf[64];
+	sprintf(buf, "/tmp/zts-zed_fd_spill-logdir/%d", getppid());
+	dup2(creat(buf, 0644), STDOUT_FILENO);
+
+	snprintf(buf, sizeof (buf), "/proc/%d/fd", getppid());
+	execlp("ls", "ls", buf, NULL);
+	_exit(127);
+}

tests/zfs-tests/tests/functional/events/zed_fd_spill.ksh

@@ -0,0 +1,77 @@
+#!/bin/ksh -p
+#
+# 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 at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# 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 at usr/src/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
+#
+
+# DESCRIPTION:
+# Verify ZEDLETs only inherit the fds specified in the manpage
+#
+# STRATEGY:
+# 1. Inject a ZEDLET that dumps the fds it gets to a file.
+# 2. Generate some events.
+# 3. Read back the generated files and assert that there is no fd past 3,
+#    and there are exactly 4 fds.
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/events/events_common.kshlib
+
+verify_runnable "both"
+
+function cleanup
+{
+	log_must rm -rf "$logdir"
+	log_must rm "/tmp/zts-zed_fd_spill-logdir"
+	log_must zed_stop
+}
+
+log_assert "Verify ZEDLETs inherit only the fds specified"
+log_onexit cleanup
+
+logdir="$(mktemp -d)"
+log_must ln -s "$logdir" /tmp/zts-zed_fd_spill-logdir
+
+self="$(readlink -f "$0")"
+log_must ln -s "${self%/*}/zed_fd_spill-zedlet" "${ZEDLET_DIR}/all-dumpfds"
+
+log_must zpool events -c
+log_must zed_stop
+log_must zed_start
+
+log_must truncate -s 0 $ZED_DEBUG_LOG
+log_must zpool scrub $TESTPOOL
+log_must zfs set compression=off $TESTPOOL/$TESTFS
+log_must wait_scrubbed $TESTPOOL
+log_must file_wait $ZED_DEBUG_LOG 3
+
+if [ -n "$(find "$logdir" -maxdepth 0 -empty)" ]; then
+	log_fail "Our ZEDLET didn't run!"
+fi
+log_must awk '
+	!/^[0123]$/ {
+		print FILENAME ": " $0
+		err=1
+	}
+	END {
+		exit err
+	}
+' "$logdir"/*
+wc -l "$logdir"/* | log_must awk '$1 != "4" && $2 != "total" {print; exit 1}'
+
+log_pass "ZED doesn't leak fds to ZEDLETs"