Tag zfs-0.7.13

META file and changelog updated.

Signed-off-by: Tony Hutter <hutter2@llnl.gov>

.github/CONTRIBUTING.md

@@ -161,7 +161,7 @@ coding convention.
 ### Commit Message Formats
 #### New Changes
 Commit messages for new changes must meet the following guidelines:
-* In 50 characters or less, provide a summary of the change as the
+* In 72 characters or less, provide a summary of the change as the
 first line in the commit message.
 * A body which provides a description of the change. If necessary,
 please summarize important information such as why the proposed

META

@@ -1,7 +1,7 @@
 Meta:         1
 Name:         zfs
 Branch:       1.0
-Version:      0.7.7
+Version:      0.7.13
 Release:      1
 Release-Tags: relext
 License:      CDDL

cmd/arcstat/arcstat.py

@@ -112,7 +112,6 @@ cur = {}
 d = {}
 out = None
 kstat = None
-float_pobj = re.compile("^[0-9]+(\.[0-9]+)?$")
 
 
 def detailed_usage():
@@ -285,7 +284,7 @@ def init():
             ]
         )
     except getopt.error as msg:
-        sys.stderr.write(msg)
+        sys.stderr.write("Error: %s\n" % str(msg))
         usage()
         opts = None
 

cmd/mount_zfs/Makefile.am

@@ -7,6 +7,8 @@ DEFAULT_INCLUDES += \
 #
 # Ignore the prefix for the mount helper.  It must be installed in /sbin/
 # because this path is hardcoded in the mount(8) for security reasons.
+# However, if needed, the configure option --with-mounthelperdir= can be used
+# to override the default install location.
 #
 sbindir=$(mounthelperdir)
 sbin_PROGRAMS = mount.zfs

cmd/vdev_id/vdev_id

@@ -100,10 +100,11 @@ usage() {
 	cat << EOF
 Usage: vdev_id [-h]
        vdev_id <-d device> [-c config_file] [-p phys_per_port]
-               [-g sas_direct|sas_switch] [-m]
+               [-g sas_direct|sas_switch|scsi] [-m]
 
   -c    specify name of alernate config file [default=$CONFIG]
   -d    specify basename of device (i.e. sda)
+  -e    Create enclose device symlinks only (/dev/by-enclosure)
   -g    Storage network topology [default="$TOPOLOGY"]
   -m    Run in multipath mode
   -p    number of phy's per switch port [default=$PHYS_PER_PORT]
@@ -135,7 +136,7 @@ map_channel() {
 		MAPPED_CHAN=`awk "\\$1 == \"channel\" && \\$2 == ${PORT} \
 			{ print \\$3; exit }" $CONFIG`
 		;;
-		"sas_direct")
+		"sas_direct"|"scsi")
 		MAPPED_CHAN=`awk "\\$1 == \"channel\" && \
 			\\$2 == \"${PCI_ID}\" && \\$3 == ${PORT} \
 			{ print \\$4; exit }" $CONFIG`
@@ -276,6 +277,23 @@ sas_handler() {
 		d=$(eval echo \${$i})
 		SLOT=`echo $d | sed -e 's/^.*://'`
 		;;
+	"ses")
+		# look for this SAS path in all SCSI Enclosure Services
+		# (SES) enclosures
+		sas_address=`cat $end_device_dir/sas_address 2>/dev/null`
+		enclosures=`lsscsi -g | \
+			sed -n -e '/enclosu/s/^.* \([^ ][^ ]*\) *$/\1/p'`
+		for enclosure in $enclosures; do
+			set -- $(sg_ses -p aes $enclosure | \
+				awk "/device slot number:/{slot=\$12} \
+					/SAS address: $sas_address/\
+					{print slot}")
+			SLOT=$1
+			if [ -n "$SLOT" ] ; then
+				break
+			fi
+		done
+		;;
 	esac
 	if [ -z "$SLOT" ] ; then
 		return
@@ -289,6 +307,156 @@ sas_handler() {
 	echo ${CHAN}${SLOT}${PART}
 }
 
+scsi_handler() {
+	if [ -z "$FIRST_BAY_NUMBER" ] ; then
+		FIRST_BAY_NUMBER=`awk "\\$1 == \"first_bay_number\" \
+			{print \\$2; exit}" $CONFIG`
+	fi
+	FIRST_BAY_NUMBER=${FIRST_BAY_NUMBER:-0}
+
+	if [ -z "$PHYS_PER_PORT" ] ; then
+		PHYS_PER_PORT=`awk "\\$1 == \"phys_per_port\" \
+			{print \\$2; exit}" $CONFIG`
+	fi
+	PHYS_PER_PORT=${PHYS_PER_PORT:-4}
+	if ! echo $PHYS_PER_PORT | grep -q -E '^[0-9]+$' ; then
+		echo "Error: phys_per_port value $PHYS_PER_PORT is non-numeric"
+		exit 1
+	fi
+
+	if [ -z "$MULTIPATH_MODE" ] ; then
+		MULTIPATH_MODE=`awk "\\$1 == \"multipath\" \
+			{print \\$2; exit}" $CONFIG`
+	fi
+
+	# Use first running component device if we're handling a dm-mpath device
+	if [ "$MULTIPATH_MODE" = "yes" ] ; then
+		# If udev didn't tell us the UUID via DM_NAME, check /dev/mapper
+		if [ -z "$DM_NAME" ] ; then
+			DM_NAME=`ls -l --full-time /dev/mapper |
+				awk "/\/$DEV$/{print \\$9}"`
+		fi
+
+		# For raw disks udev exports DEVTYPE=partition when
+		# handling partitions, and the rules can be written to
+		# take advantage of this to append a -part suffix.  For
+		# dm devices we get DEVTYPE=disk even for partitions so
+		# we have to append the -part suffix directly in the
+		# helper.
+		if [ "$DEVTYPE" != "partition" ] ; then
+			PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
+		fi
+
+		# Strip off partition information.
+		DM_NAME=`echo $DM_NAME | sed 's/p[0-9][0-9]*$//'`
+		if [ -z "$DM_NAME" ] ; then
+			return
+		fi
+
+		# Get the raw scsi device name from multipath -ll. Strip off
+		# leading pipe symbols to make field numbering consistent.
+		DEV=`multipath -ll $DM_NAME |
+			awk '/running/{gsub("^[|]"," "); print $3 ; exit}'`
+		if [ -z "$DEV" ] ; then
+			return
+		fi
+	fi
+
+	if echo $DEV | grep -q ^/devices/ ; then
+		sys_path=$DEV
+	else
+		sys_path=`udevadm info -q path -p /sys/block/$DEV 2>/dev/null`
+	fi
+
+	# expect sys_path like this, for example:
+	# /devices/pci0000:00/0000:00:0b.0/0000:09:00.0/0000:0a:05.0/0000:0c:00.0/host3/target3:1:0/3:1:0:21/block/sdv
+
+	# Use positional parameters as an ad-hoc array
+	set -- $(echo "$sys_path" | tr / ' ')
+	num_dirs=$#
+	scsi_host_dir="/sys"
+
+	# Get path up to /sys/.../hostX
+	i=1
+	while [ $i -le $num_dirs ] ; do
+		d=$(eval echo \${$i})
+		scsi_host_dir="$scsi_host_dir/$d"
+		echo $d | grep -q -E '^host[0-9]+$' && break
+		i=$(($i + 1))
+	done
+
+	if [ $i = $num_dirs ] ; then
+		return
+	fi
+
+	PCI_ID=$(eval echo \${$(($i -1))} | awk -F: '{print $2":"$3}')
+
+	# In scsi mode, the directory two levels beneath
+	# /sys/.../hostX reveals the port and slot.
+	port_dir=$scsi_host_dir
+	j=$(($i + 2))
+
+	i=$(($i + 1))
+	while [ $i -le $j ] ; do
+		port_dir="$port_dir/$(eval echo \${$i})"
+		i=$(($i + 1))
+	done
+
+	set -- $(echo $port_dir | sed -e 's/^.*:\([^:]*\):\([^:]*\)$/\1 \2/')
+	PORT=$1
+	SLOT=$(($2 + $FIRST_BAY_NUMBER))
+
+	if [ -z "$SLOT" ] ; then
+		return
+	fi
+
+	CHAN=`map_channel $PCI_ID $PORT`
+	SLOT=`map_slot $SLOT $CHAN`
+	if [ -z "$CHAN" ] ; then
+		return
+	fi
+	echo ${CHAN}${SLOT}${PART}
+}
+
+# Figure out the name for the enclosure symlink
+enclosure_handler () {
+	# We get all the info we need from udev's DEVPATH variable:
+	#
+	# DEVPATH=/sys/devices/pci0000:00/0000:00:03.0/0000:05:00.0/host0/subsystem/devices/0:0:0:0/scsi_generic/sg0
+
+	# Get the enclosure ID ("0:0:0:0")
+	ENC=$(basename $(readlink -m "/sys/$DEVPATH/../.."))
+	if [ ! -d /sys/class/enclosure/$ENC ] ; then
+		# Not an enclosure, bail out
+		return
+	fi
+
+	# Get the long sysfs device path to our enclosure. Looks like:
+	# /devices/pci0000:00/0000:00:03.0/0000:05:00.0/host0/port-0:0/ ... /enclosure/0:0:0:0
+
+	ENC_DEVICE=$(readlink /sys/class/enclosure/$ENC)
+
+	# Grab the full path to the hosts port dir:
+	# /devices/pci0000:00/0000:00:03.0/0000:05:00.0/host0/port-0:0
+	PORT_DIR=$(echo $ENC_DEVICE | grep -Eo '.+host[0-9]+/port-[0-9]+:[0-9]+')
+
+	# Get the port number
+	PORT_ID=$(echo $PORT_DIR | grep -Eo "[0-9]+$")
+
+	# The PCI directory is two directories up from the port directory
+	# /sys/devices/pci0000:00/0000:00:03.0/0000:05:00.0
+	PCI_ID_LONG=$(basename $(readlink -m "/sys/$PORT_DIR/../.."))
+
+	# Strip down the PCI address from 0000:05:00.0 to 05:00.0
+	PCI_ID=$(echo "$PCI_ID_LONG" | sed -r 's/^[0-9]+://g')
+
+	# Name our device according to vdev_id.conf (like "L0" or "U1").
+	NAME=$(awk "/channel/{if (\$1 == \"channel\" && \$2 == \"$PCI_ID\" && \
+		\$3 == \"$PORT_ID\") {print \$4int(count[\$4])}; count[\$4]++}" $CONFIG)
+
+	echo "${NAME}"
+}
+
 alias_handler () {
 	# Special handling is needed to correctly append a -part suffix
 	# to partitions of device mapper devices.  The DEVTYPE attribute
@@ -344,7 +512,7 @@ alias_handler () {
 	done
 }
 
-while getopts 'c:d:g:mp:h' OPTION; do
+while getopts 'c:d:eg:mp:h' OPTION; do
 	case ${OPTION} in
 	c)
 		CONFIG=${OPTARG}
@@ -352,6 +520,16 @@ while getopts 'c:d:g:mp:h' OPTION; do
 	d)
 		DEV=${OPTARG}
 		;;
+	e)
+	# When udev sees a scsi_generic device, it calls this script with -e to
+	# create the enclosure device symlinks only.  We also need
+	# "enclosure_symlinks yes" set in vdev_id.config to actually create the
+	# symlink.
+	ENCLOSURE_MODE=$(awk '{if ($1 == "enclosure_symlinks") print $2}' $CONFIG)
+	if [ "$ENCLOSURE_MODE" != "yes" ] ; then
+		exit 0
+	fi
+		;;
 	g)
 		TOPOLOGY=$OPTARG
 		;;
@@ -371,7 +549,7 @@ if [ ! -r $CONFIG ] ; then
 	exit 0
 fi
 
-if [ -z "$DEV" ] ; then
+if [ -z "$DEV" -a -z "$ENCLOSURE_MODE" ] ; then
 	echo "Error: missing required option -d"
 	exit 1
 fi
@@ -384,16 +562,37 @@ if [ -z "$BAY" ] ; then
 	BAY=`awk "\\$1 == \"slot\" {print \\$2; exit}" $CONFIG`
 fi
 
+TOPOLOGY=${TOPOLOGY:-sas_direct}
+
+# Should we create /dev/by-enclosure symlinks?
+if [ "$ENCLOSURE_MODE" = "yes" -a "$TOPOLOGY" = "sas_direct" ] ; then
+	ID_ENCLOSURE=$(enclosure_handler)
+	if [ -z "$ID_ENCLOSURE" ] ; then
+		exit 0
+	fi
+
+	# Just create the symlinks to the enclosure devices and then exit.
+	ENCLOSURE_PREFIX=$(awk '/enclosure_symlinks_prefix/{print $2}' $CONFIG)
+	if [ -z "$ENCLOSURE_PREFIX" ] ; then
+		ENCLOSURE_PREFIX="enc"
+	fi
+	echo "ID_ENCLOSURE=$ID_ENCLOSURE"
+	echo "ID_ENCLOSURE_PATH=by-enclosure/$ENCLOSURE_PREFIX-$ID_ENCLOSURE"
+	exit 0
+fi
+
 # First check if an alias was defined for this device.
 ID_VDEV=`alias_handler`
 
 if [ -z "$ID_VDEV" ] ; then
 	BAY=${BAY:-bay}
-	TOPOLOGY=${TOPOLOGY:-sas_direct}
 	case $TOPOLOGY in
 		sas_direct|sas_switch)
 			ID_VDEV=`sas_handler`
 			;;
+		scsi)
+			ID_VDEV=`scsi_handler`
+			;;
 		*)
 			echo "Error: unknown topology $TOPOLOGY"
 			exit 1

cmd/zdb/zdb.c

@@ -24,7 +24,7 @@
  * Copyright (c) 2011, 2016 by Delphix. All rights reserved.
  * Copyright (c) 2014 Integros [integros.com]
  * Copyright 2016 Nexenta Systems, Inc.
- * Copyright (c) 2017 Lawrence Livermore National Security, LLC.
+ * Copyright (c) 2017, 2018 Lawrence Livermore National Security, LLC.
  * Copyright (c) 2015, 2017, Intel Corporation.
  */
 
@@ -3659,6 +3659,22 @@ dump_simulated_ddt(spa_t *spa)
 	dump_dedup_ratio(&dds_total);
 }
 
+static void
+zdb_set_skip_mmp(char *target)
+{
+	spa_t *spa;
+
+	/*
+	 * Disable the activity check to allow examination of
+	 * active pools.
+	 */
+	mutex_enter(&spa_namespace_lock);
+	if ((spa = spa_lookup(target)) != NULL) {
+		spa->spa_import_flags |= ZFS_IMPORT_SKIP_MMP;
+	}
+	mutex_exit(&spa_namespace_lock);
+}
+
 static void
 dump_zpool(spa_t *spa)
 {
@@ -4412,14 +4428,15 @@ main(int argc, char **argv)
 				    target, strerror(ENOMEM));
 			}
 
-			/*
-			 * Disable the activity check to allow examination of
-			 * active pools.
-			 */
 			if (dump_opt['C'] > 1) {
 				(void) printf("\nConfiguration for import:\n");
 				dump_nvlist(cfg, 8);
 			}
+
+			/*
+			 * Disable the activity check to allow examination of
+			 * active pools.
+			 */
 			error = spa_import(target_pool, cfg, NULL,
 			    flags | ZFS_IMPORT_SKIP_MMP);
 		}
@@ -4430,16 +4447,7 @@ main(int argc, char **argv)
 
 	if (error == 0) {
 		if (target_is_spa || dump_opt['R']) {
-			/*
-			 * Disable the activity check to allow examination of
-			 * active pools.
-			 */
-			mutex_enter(&spa_namespace_lock);
-			if ((spa = spa_lookup(target)) != NULL) {
-				spa->spa_import_flags |= ZFS_IMPORT_SKIP_MMP;
-			}
-			mutex_exit(&spa_namespace_lock);
-
+			zdb_set_skip_mmp(target);
 			error = spa_open_rewind(target, &spa, FTAG, policy,
 			    NULL);
 			if (error) {
@@ -4462,6 +4470,7 @@ main(int argc, char **argv)
 				}
 			}
 		} else {
+			zdb_set_skip_mmp(target);
 			error = open_objset(target, DMU_OST_ANY, FTAG, &os);
 		}
 	}

cmd/zed/zed.d/all-debug.sh

@@ -10,6 +10,8 @@
 
 : "${ZED_DEBUG_LOG:="${TMPDIR:="/tmp"}/zed.debug.log"}"
 
+zed_exit_if_ignoring_this_event
+
 lockfile="$(basename -- "${ZED_DEBUG_LOG}").lock"
 
 umask 077

cmd/zed/zed.d/all-syslog.sh

@@ -5,6 +5,8 @@
 [ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
 . "${ZED_ZEDLET_DIR}/zed-functions.sh"
 
+zed_exit_if_ignoring_this_event
+
 zed_log_msg "eid=${ZEVENT_EID}" "class=${ZEVENT_SUBCLASS}" \
     "${ZEVENT_POOL_GUID:+"pool_guid=${ZEVENT_POOL_GUID}"}" \
     "${ZEVENT_VDEV_PATH:+"vdev_path=${ZEVENT_VDEV_PATH}"}" \

cmd/zed/zed.d/zed-functions.sh

@@ -438,3 +438,23 @@ zed_guid_to_pool()
 		$ZPOOL get -H -ovalue,name guid | awk '$1=='"$guid"' {print $2}'
 	fi
 }
+
+# zed_exit_if_ignoring_this_event
+#
+# Exit the script if we should ignore this event, as determined by
+# $ZED_SYSLOG_SUBCLASS_INCLUDE and $ZED_SYSLOG_SUBCLASS_EXCLUDE in zed.rc.
+# This function assumes you've imported the normal zed variables.
+zed_exit_if_ignoring_this_event()
+{
+	if [ -n "${ZED_SYSLOG_SUBCLASS_INCLUDE}" ]; then
+	    eval "case ${ZEVENT_SUBCLASS} in
+	    ${ZED_SYSLOG_SUBCLASS_INCLUDE});;
+	    *) exit 0;;
+	    esac"
+	elif [ -n "${ZED_SYSLOG_SUBCLASS_EXCLUDE}" ]; then
+	    eval "case ${ZEVENT_SUBCLASS} in
+	    ${ZED_SYSLOG_SUBCLASS_EXCLUDE}) exit 0;;
+	    *);;
+	    esac"
+	fi
+}

cmd/zed/zed.d/zed.rc

@@ -100,3 +100,14 @@ ZED_USE_ENCLOSURE_LEDS=1
 #
 #ZED_SYSLOG_TAG="zed"
 
+##
+# Which set of event subclasses to log
+# By default, events from all subclasses are logged.
+# If ZED_SYSLOG_SUBCLASS_INCLUDE is set, only subclasses
+# matching the pattern are logged. Use the pipe symbol (|)
+# or shell wildcards (*, ?) to match multiple subclasses.
+# Otherwise, if ZED_SYSLOG_SUBCLASS_EXCLUDE is set, the
+# matching subclasses are excluded from logging.
+#ZED_SYSLOG_SUBCLASS_INCLUDE="checksum|scrub_*|vdev.*"
+#ZED_SYSLOG_SUBCLASS_EXCLUDE="statechange|config_*|history_event"
+

cmd/zfs/zfs_main.c

@@ -7041,6 +7041,7 @@ main(int argc, char **argv)
 	int ret = 0;
 	int i = 0;
 	char *cmdname;
+	char **newargv;
 
 	(void) setlocale(LC_ALL, "");
 	(void) textdomain(TEXT_DOMAIN);
@@ -7095,17 +7096,26 @@ main(int argc, char **argv)
 
 	libzfs_print_on_error(g_zfs, B_TRUE);
 
+	/*
+	 * Many commands modify input strings for string parsing reasons.
+	 * We create a copy to protect the original argv.
+	 */
+	newargv = malloc((argc + 1) * sizeof (newargv[0]));
+	for (i = 0; i < argc; i++)
+		newargv[i] = strdup(argv[i]);
+	newargv[argc] = NULL;
+
 	/*
 	 * Run the appropriate command.
 	 */
 	libzfs_mnttab_cache(g_zfs, B_TRUE);
 	if (find_command_idx(cmdname, &i) == 0) {
 		current_command = &command_table[i];
-		ret = command_table[i].func(argc - 1, argv + 1);
+		ret = command_table[i].func(argc - 1, newargv + 1);
 	} else if (strchr(cmdname, '=') != NULL) {
 		verify(find_command_idx("set", &i) == 0);
 		current_command = &command_table[i];
-		ret = command_table[i].func(argc, argv);
+		ret = command_table[i].func(argc, newargv);
 	} else {
 		(void) fprintf(stderr, gettext("unrecognized "
 		    "command '%s'\n"), cmdname);
@@ -7113,6 +7123,10 @@ main(int argc, char **argv)
 		ret = 1;
 	}
 
+	for (i = 0; i < argc; i++)
+		free(newargv[i]);
+	free(newargv);
+
 	if (ret == 0 && log_history)
 		(void) zpool_log_history(g_zfs, history_str);
 

cmd/zpios/zpios_main.c

@@ -525,10 +525,11 @@ run_one(cmd_args_t *args, uint32_t id, uint32_t T, uint32_t N,
 
 	memset(cmd, 0, cmd_size);
 	cmd->cmd_magic = ZPIOS_CMD_MAGIC;
-	strncpy(cmd->cmd_pool, args->pool, ZPIOS_NAME_SIZE - 1);
-	strncpy(cmd->cmd_pre, args->pre, ZPIOS_PATH_SIZE - 1);
-	strncpy(cmd->cmd_post, args->post, ZPIOS_PATH_SIZE - 1);
-	strncpy(cmd->cmd_log, args->log, ZPIOS_PATH_SIZE - 1);
+	snprintf(cmd->cmd_pool, sizeof (cmd->cmd_pool), "%s", args->pool);
+	snprintf(cmd->cmd_pre, sizeof (cmd->cmd_pre), "%s", args->pre);
+	snprintf(cmd->cmd_post, sizeof (cmd->cmd_post), "%s", args->post);
+	snprintf(cmd->cmd_log, sizeof (cmd->cmd_log), "%s", args->log);
+
 	cmd->cmd_id = id;
 	cmd->cmd_chunk_size = C;
 	cmd->cmd_thread_count = T;

cmd/zpool/zpool_main.c

@@ -3493,7 +3493,7 @@ single_histo_average(uint64_t *histo, unsigned int buckets)
 
 static void
 print_iostat_queues(iostat_cbdata_t *cb, nvlist_t *oldnv,
-    nvlist_t *newnv, double scale)
+    nvlist_t *newnv)
 {
 	int i;
 	uint64_t val;
@@ -3523,7 +3523,7 @@ print_iostat_queues(iostat_cbdata_t *cb, nvlist_t *oldnv,
 		format = ZFS_NICENUM_1024;
 
 	for (i = 0; i < ARRAY_SIZE(names); i++) {
-		val = nva[i].data[0] * scale;
+		val = nva[i].data[0];
 		print_one_stat(val, format, column_width, cb->cb_scripted);
 	}
 
@@ -3532,7 +3532,7 @@ print_iostat_queues(iostat_cbdata_t *cb, nvlist_t *oldnv,
 
 static void
 print_iostat_latency(iostat_cbdata_t *cb, nvlist_t *oldnv,
-    nvlist_t *newnv, double scale)
+    nvlist_t *newnv)
 {
 	int i;
 	uint64_t val;
@@ -3562,7 +3562,7 @@ print_iostat_latency(iostat_cbdata_t *cb, nvlist_t *oldnv,
 	/* Print our avg latencies on the line */
 	for (i = 0; i < ARRAY_SIZE(names); i++) {
 		/* Compute average latency for a latency histo */
-		val = single_histo_average(nva[i].data, nva[i].count) * scale;
+		val = single_histo_average(nva[i].data, nva[i].count);
 		print_one_stat(val, format, column_width, cb->cb_scripted);
 	}
 	free_calc_stats(nva, ARRAY_SIZE(names));
@@ -3701,9 +3701,9 @@ print_vdev_stats(zpool_handle_t *zhp, const char *name, nvlist_t *oldnv,
 		print_iostat_default(calcvs, cb, scale);
 	}
 	if (cb->cb_flags & IOS_LATENCY_M)
-		print_iostat_latency(cb, oldnv, newnv, scale);
+		print_iostat_latency(cb, oldnv, newnv);
 	if (cb->cb_flags & IOS_QUEUES_M)
-		print_iostat_queues(cb, oldnv, newnv, scale);
+		print_iostat_queues(cb, oldnv, newnv);
 	if (cb->cb_flags & IOS_ANYHISTO_M) {
 		printf("\n");
 		print_iostat_histos(cb, oldnv, newnv, scale, name);
@@ -6226,7 +6226,8 @@ status_callback(zpool_handle_t *zhp, void *data)
 	    &nvroot) == 0);
 	verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS,
 	    (uint64_t **)&vs, &c) == 0);
-	health = zpool_state_to_name(vs->vs_state, vs->vs_aux);
+
+	health = zpool_get_state_str(zhp);
 
 	(void) printf(gettext("  pool: %s\n"), zpool_get_name(zhp));
 	(void) printf(gettext(" state: %s\n"), health);
@@ -6395,6 +6396,15 @@ status_callback(zpool_handle_t *zhp, void *data)
 		    "to be recovered.\n"));
 		break;
 
+	case ZPOOL_STATUS_IO_FAILURE_MMP:
+		(void) printf(gettext("status: The pool is suspended because "
+		    "multihost writes failed or were delayed;\n\tanother "
+		    "system could import the pool undetected.\n"));
+		(void) printf(gettext("action: Make sure the pool's devices "
+		    "are connected, then reboot your system and\n\timport the "
+		    "pool.\n"));
+		break;
+
 	case ZPOOL_STATUS_IO_FAILURE_WAIT:
 	case ZPOOL_STATUS_IO_FAILURE_CONTINUE:
 		(void) printf(gettext("status: One or more devices are "
@@ -7961,6 +7971,7 @@ main(int argc, char **argv)
 	int ret = 0;
 	int i = 0;
 	char *cmdname;
+	char **newargv;
 
 	(void) setlocale(LC_ALL, "");
 	(void) textdomain(TEXT_DOMAIN);
@@ -7995,16 +8006,25 @@ main(int argc, char **argv)
 
 	zfs_save_arguments(argc, argv, history_str, sizeof (history_str));
 
+	/*
+	 * Many commands modify input strings for string parsing reasons.
+	 * We create a copy to protect the original argv.
+	 */
+	newargv = malloc((argc + 1) * sizeof (newargv[0]));
+	for (i = 0; i < argc; i++)
+		newargv[i] = strdup(argv[i]);
+	newargv[argc] = NULL;
+
 	/*
 	 * Run the appropriate command.
 	 */
 	if (find_command_idx(cmdname, &i) == 0) {
 		current_command = &command_table[i];
-		ret = command_table[i].func(argc - 1, argv + 1);
+		ret = command_table[i].func(argc - 1, newargv + 1);
 	} else if (strchr(cmdname, '=')) {
 		verify(find_command_idx("set", &i) == 0);
 		current_command = &command_table[i];
-		ret = command_table[i].func(argc, argv);
+		ret = command_table[i].func(argc, newargv);
 	} else if (strcmp(cmdname, "freeze") == 0 && argc == 3) {
 		/*
 		 * 'freeze' is a vile debugging abomination, so we treat
@@ -8021,6 +8041,10 @@ main(int argc, char **argv)
 		ret = 1;
 	}
 
+	for (i = 0; i < argc; i++)
+		free(newargv[i]);
+	free(newargv);
+
 	if (ret == 0 && log_history)
 		(void) zpool_log_history(g_zfs, history_str);
 

cmd/zpool/zpool_vdev.c

@@ -191,6 +191,7 @@ static vdev_disk_db_entry_t vdev_disk_database[] = {
 	{"ATA     INTEL SSDSC2BP24", 4096},
 	{"ATA     INTEL SSDSC2BP48", 4096},
 	{"NA      SmrtStorSDLKAE9W", 4096},
+	{"NVMe    Amazon EC2 NVMe ", 4096},
 	/* Imported from Open Solaris */
 	{"ATA     MARVELL SD88SA02", 4096},
 	/* Advanced format Hard drives */

cmd/ztest/ztest.c

@@ -171,8 +171,8 @@ typedef struct ztest_shared_opts {
 } ztest_shared_opts_t;
 
 static const ztest_shared_opts_t ztest_opts_defaults = {
-	.zo_pool = { 'z', 't', 'e', 's', 't', '\0' },
-	.zo_dir = { '/', 't', 'm', 'p', '\0' },
+	.zo_pool = "ztest",
+	.zo_dir = "/tmp",
 	.zo_alt_ztest = { '\0' },
 	.zo_alt_libpath = { '\0' },
 	.zo_vdevs = 5,
@@ -198,6 +198,7 @@ extern uint64_t metaslab_df_alloc_threshold;
 extern int metaslab_preload_limit;
 extern boolean_t zfs_compressed_arc_enabled;
 extern int zfs_abd_scatter_enabled;
+extern int dmu_object_alloc_chunk_shift;
 
 static ztest_shared_opts_t *ztest_shared_opts;
 static ztest_shared_opts_t ztest_opts;
@@ -310,6 +311,7 @@ static ztest_shared_callstate_t *ztest_shared_callstate;
 ztest_func_t ztest_dmu_read_write;
 ztest_func_t ztest_dmu_write_parallel;
 ztest_func_t ztest_dmu_object_alloc_free;
+ztest_func_t ztest_dmu_object_next_chunk;
 ztest_func_t ztest_dmu_commit_callbacks;
 ztest_func_t ztest_zap;
 ztest_func_t ztest_zap_parallel;
@@ -357,6 +359,7 @@ ztest_info_t ztest_info[] = {
 	ZTI_INIT(ztest_dmu_read_write, 1, &zopt_always),
 	ZTI_INIT(ztest_dmu_write_parallel, 10, &zopt_always),
 	ZTI_INIT(ztest_dmu_object_alloc_free, 1, &zopt_always),
+	ZTI_INIT(ztest_dmu_object_next_chunk, 1, &zopt_sometimes),
 	ZTI_INIT(ztest_dmu_commit_callbacks, 1, &zopt_always),
 	ZTI_INIT(ztest_zap, 30, &zopt_always),
 	ZTI_INIT(ztest_zap_parallel, 100, &zopt_always),
@@ -1186,7 +1189,7 @@ ztest_spa_prop_set_uint64(zpool_prop_t prop, uint64_t value)
  */
 typedef struct {
 	list_node_t z_lnode;
-	refcount_t z_refcnt;
+	zfs_refcount_t z_refcnt;
 	uint64_t z_object;
 	zfs_rlock_t z_range_lock;
 } ztest_znode_t;
@@ -1202,7 +1205,7 @@ ztest_znode_init(uint64_t object)
 	ztest_znode_t *zp = umem_alloc(sizeof (*zp), UMEM_NOFAIL);
 
 	list_link_init(&zp->z_lnode);
-	refcount_create(&zp->z_refcnt);
+	zfs_refcount_create(&zp->z_refcnt);
 	zp->z_object = object;
 	zfs_rlock_init(&zp->z_range_lock);
 
@@ -1212,10 +1215,10 @@ ztest_znode_init(uint64_t object)
 static void
 ztest_znode_fini(ztest_znode_t *zp)
 {
-	ASSERT(refcount_is_zero(&zp->z_refcnt));
+	ASSERT(zfs_refcount_is_zero(&zp->z_refcnt));
 	zfs_rlock_destroy(&zp->z_range_lock);
 	zp->z_object = 0;
-	refcount_destroy(&zp->z_refcnt);
+	zfs_refcount_destroy(&zp->z_refcnt);
 	list_link_init(&zp->z_lnode);
 	umem_free(zp, sizeof (*zp));
 }
@@ -1245,13 +1248,13 @@ ztest_znode_get(ztest_ds_t *zd, uint64_t object)
 	for (zp = list_head(&zll->z_list); (zp);
 	    zp = list_next(&zll->z_list, zp)) {
 		if (zp->z_object == object) {
-			refcount_add(&zp->z_refcnt, RL_TAG);
+			zfs_refcount_add(&zp->z_refcnt, RL_TAG);
 			break;
 		}
 	}
 	if (zp == NULL) {
 		zp = ztest_znode_init(object);
-		refcount_add(&zp->z_refcnt, RL_TAG);
+		zfs_refcount_add(&zp->z_refcnt, RL_TAG);
 		list_insert_head(&zll->z_list, zp);
 	}
 	mutex_exit(&zll->z_lock);
@@ -1265,8 +1268,8 @@ ztest_znode_put(ztest_ds_t *zd, ztest_znode_t *zp)
 	ASSERT3U(zp->z_object, !=, 0);
 	zll = &zd->zd_range_lock[zp->z_object & (ZTEST_OBJECT_LOCKS - 1)];
 	mutex_enter(&zll->z_lock);
-	refcount_remove(&zp->z_refcnt, RL_TAG);
-	if (refcount_is_zero(&zp->z_refcnt)) {
+	zfs_refcount_remove(&zp->z_refcnt, RL_TAG);
+	if (zfs_refcount_is_zero(&zp->z_refcnt)) {
 		list_remove(&zll->z_list, zp);
 		ztest_znode_fini(zp);
 	}
@@ -3927,6 +3930,26 @@ ztest_dmu_object_alloc_free(ztest_ds_t *zd, uint64_t id)
 	umem_free(od, size);
 }
 
+/*
+ * Rewind the global allocator to verify object allocation backfilling.
+ */
+void
+ztest_dmu_object_next_chunk(ztest_ds_t *zd, uint64_t id)
+{
+	objset_t *os = zd->zd_os;
+	int dnodes_per_chunk = 1 << dmu_object_alloc_chunk_shift;
+	uint64_t object;
+
+	/*
+	 * Rewind the global allocator randomly back to a lower object number
+	 * to force backfilling and reclamation of recently freed dnodes.
+	 */
+	mutex_enter(&os->os_obj_lock);
+	object = ztest_random(os->os_obj_next_chunk);
+	os->os_obj_next_chunk = P2ALIGN(object, dnodes_per_chunk);
+	mutex_exit(&os->os_obj_lock);
+}
+
 #undef OD_ARRAY_SIZE
 #define	OD_ARRAY_SIZE	2
 

cmd/zvol_id/zvol_id_main.c

@@ -55,11 +55,12 @@ main(int argc, char **argv)
 {
 	int fd, error = 0;
 	char zvol_name[ZFS_MAX_DATASET_NAME_LEN];
-	char zvol_name_part[ZFS_MAX_DATASET_NAME_LEN];
+	char *zvol_name_part = NULL;
 	char *dev_name;
 	struct stat64 statbuf;
 	int dev_minor, dev_part;
 	int i;
+	int rc;
 
 	if (argc < 2) {
 		printf("Usage: %s /dev/zvol_device_node\n", argv[0]);
@@ -88,11 +89,13 @@ main(int argc, char **argv)
 		return (errno);
 	}
 	if (dev_part > 0)
-		snprintf(zvol_name_part, ZFS_MAX_DATASET_NAME_LEN,
-		    "%s-part%d", zvol_name, dev_part);
+		rc = asprintf(&zvol_name_part, "%s-part%d", zvol_name,
+		    dev_part);
 	else
-		snprintf(zvol_name_part, ZFS_MAX_DATASET_NAME_LEN,
-		    "%s", zvol_name);
+		rc = asprintf(&zvol_name_part, "%s", zvol_name);
+
+	if (rc == -1 || zvol_name_part == NULL)
+		goto error;
 
 	for (i = 0; i < strlen(zvol_name_part); i++) {
 		if (isblank(zvol_name_part[i]))
@@ -100,6 +103,8 @@ main(int argc, char **argv)
 	}
 
 	printf("%s\n", zvol_name_part);
+	free(zvol_name_part);
+error:
 	close(fd);
 	return (error);
 }

config/kernel-access-ok-type.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # Linux 5.0: access_ok() drops 'type' parameter:
+dnl #
+dnl # - access_ok(type, addr, size)
+dnl # + access_ok(addr, size)
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_ACCESS_OK_TYPE], [
+	AC_MSG_CHECKING([whether access_ok() has 'type' parameter])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/uaccess.h>
+	],[
+		const void __user __attribute__((unused)) *addr = (void *) 0xdeadbeef;
+		unsigned long __attribute__((unused)) size = 1;
+		int error __attribute__((unused)) = access_ok(0, addr, size);
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_ACCESS_OK_TYPE, 1, [kernel has access_ok with 'type' parameter])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-bdev-block-device-operations.m4

@@ -1,34 +0,0 @@
-dnl #
-dnl # 2.6.x API change
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS], [
-	AC_MSG_CHECKING([block device operation prototypes])
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
-	ZFS_LINUX_TRY_COMPILE([
-		#include <linux/blkdev.h>
-
-		int blk_open(struct block_device *bdev, fmode_t mode)
-		    { return 0; }
-		int blk_ioctl(struct block_device *bdev, fmode_t mode,
-		    unsigned x, unsigned long y) { return 0; }
-		int blk_compat_ioctl(struct block_device * bdev, fmode_t mode,
-		    unsigned x, unsigned long y) { return 0; }
-
-		static const struct block_device_operations
-		    bops __attribute__ ((unused)) = {
-			.open		= blk_open,
-			.release	= NULL,
-			.ioctl		= blk_ioctl,
-			.compat_ioctl	= blk_compat_ioctl,
-		};
-	],[
-	],[
-		AC_MSG_RESULT(struct block_device)
-		AC_DEFINE(HAVE_BDEV_BLOCK_DEVICE_OPERATIONS, 1,
-		          [struct block_device_operations use bdevs])
-	],[
-		AC_MSG_RESULT(struct inode)
-	])
-	EXTRA_KCFLAGS="$tmp_flags"
-])

config/kernel-bio_set_dev.m4

@@ -1,10 +1,10 @@
 dnl #
 dnl # Linux 4.14 API,
 dnl #
-dnl # The bio_set_dev() helper was introduced as part of the transition
+dnl # The bio_set_dev() helper macro was introduced as part of the transition
 dnl # to have struct gendisk in struct bio. 
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV], [
+AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV_MACRO], [
 	AC_MSG_CHECKING([whether bio_set_dev() exists])
 	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/bio.h>
@@ -20,3 +20,34 @@ AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV], [
 		AC_MSG_RESULT(no)
 	])
 ])
+
+dnl #
+dnl # Linux 5.0 API,
+dnl #
+dnl # The bio_set_dev() helper macro was updated to internally depend on
+dnl # bio_associate_blkg() symbol which is exported GPL-only.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV_GPL_ONLY], [
+	AC_MSG_CHECKING([whether bio_set_dev() is GPL-only])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/module.h>
+		#include <linux/bio.h>
+		#include <linux/fs.h>
+		MODULE_LICENSE("$ZFS_META_LICENSE");
+	],[
+		struct block_device *bdev = NULL;
+		struct bio *bio = NULL;
+		bio_set_dev(bio, bdev);
+	],[
+		AC_MSG_RESULT(no)
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BIO_SET_DEV_GPL_ONLY, 1,
+		    [bio_set_dev() GPL-only])
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV], [
+	ZFS_AC_KERNEL_BIO_SET_DEV_MACRO
+	ZFS_AC_KERNEL_BIO_SET_DEV_GPL_ONLY
+])

config/kernel-blk-queue-flags.m4

@@ -0,0 +1,38 @@
+dnl #
+dnl # API change
+dnl # https://github.com/torvalds/linux/commit/8814ce8
+dnl # Introduction of blk_queue_flag_set and blk_queue_flag_clear
+dnl #
+
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET], [
+	AC_MSG_CHECKING([whether blk_queue_flag_set() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/kernel.h>
+		#include <linux/blkdev.h>
+	],[
+		struct request_queue *q = NULL;
+		blk_queue_flag_set(0, q);
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_QUEUE_FLAG_SET, 1, [blk_queue_flag_set() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLAG_CLEAR], [
+	AC_MSG_CHECKING([whether blk_queue_flag_clear() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/kernel.h>
+		#include <linux/blkdev.h>
+	],[
+		struct request_queue *q = NULL;
+		blk_queue_flag_clear(0, q);
+	],[
+
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_QUEUE_FLAG_CLEAR, 1, [blk_queue_flag_clear() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-block-device-operations-release-void.m4

@@ -1,29 +0,0 @@
-dnl #
-dnl # 3.10.x API change
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
-	AC_MSG_CHECKING([whether block_device_operations.release is void])
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
-	ZFS_LINUX_TRY_COMPILE([
-		#include <linux/blkdev.h>
-
-		void blk_release(struct gendisk *g, fmode_t mode) { return; }
-
-		static const struct block_device_operations
-		    bops __attribute__ ((unused)) = {
-			.open		= NULL,
-			.release	= blk_release,
-			.ioctl		= NULL,
-			.compat_ioctl	= NULL,
-		};
-	],[
-	],[
-		AC_MSG_RESULT(void)
-		AC_DEFINE(HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID, 1,
-		          [struct block_device_operations.release returns void])
-	],[
-		AC_MSG_RESULT(int)
-	])
-	EXTRA_KCFLAGS="$tmp_flags"
-])

config/kernel-block-device-operations.m4

@@ -0,0 +1,57 @@
+dnl #
+dnl # 2.6.38 API change
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS], [
+	AC_MSG_CHECKING([whether bops->check_events() exists])
+	tmp_flags="$EXTRA_KCFLAGS"
+	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/blkdev.h>
+
+		unsigned int blk_check_events(struct gendisk *disk,
+		    unsigned int clearing) { return (0); }
+
+		static const struct block_device_operations
+		    bops __attribute__ ((unused)) = {
+			.check_events	= blk_check_events,
+		};
+	],[
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS, 1,
+		    [bops->check_events() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+	EXTRA_KCFLAGS="$tmp_flags"
+])
+
+dnl #
+dnl # 3.10.x API change
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
+	AC_MSG_CHECKING([whether bops->release() is void])
+	tmp_flags="$EXTRA_KCFLAGS"
+	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/blkdev.h>
+
+		void blk_release(struct gendisk *g, fmode_t mode) { return; }
+
+		static const struct block_device_operations
+		    bops __attribute__ ((unused)) = {
+			.open		= NULL,
+			.release	= blk_release,
+			.ioctl		= NULL,
+			.compat_ioctl	= NULL,
+		};
+	],[
+	],[
+		AC_MSG_RESULT(void)
+		AC_DEFINE(HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID, 1,
+		          [bops->release() returns void])
+	],[
+		AC_MSG_RESULT(int)
+	])
+	EXTRA_KCFLAGS="$tmp_flags"
+])

config/kernel-current-time.m4

@@ -1,15 +1,14 @@
 dnl #
 dnl # 4.9, current_time() added
+dnl # 4.18, return type changed from timespec to timespec64
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_CURRENT_TIME],
 	[AC_MSG_CHECKING([whether current_time() exists])
 	ZFS_LINUX_TRY_COMPILE_SYMBOL([
 		#include <linux/fs.h>
 	], [
-		struct inode ip;
-		struct timespec now __attribute__ ((unused));
-
-		now = current_time(&ip);
+		struct inode ip __attribute__ ((unused));
+		ip.i_atime = current_time(&ip);
 	], [current_time], [fs/inode.c], [
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_CURRENT_TIME, 1, [current_time() exists])

config/kernel-elevator-change.m4

@@ -1,6 +1,6 @@
 dnl #
-dnl # 2.6.36 API change
-dnl # Verify the elevator_change() symbol is available.
+dnl # 2.6.36 API, exported elevator_change() symbol
+dnl # 4.12 API, removed elevator_change() symbol
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_ELEVATOR_CHANGE], [
 	AC_MSG_CHECKING([whether elevator_change() is available])

config/kernel-fpu.m4

@@ -1,18 +1,41 @@
 dnl # 
-dnl # 4.2 API change
-dnl # asm/i387.h is replaced by asm/fpu/api.h
+dnl # Handle differences in kernel FPU code.
+dnl #
+dnl # Kernel
+dnl # 5.0:	All kernel fpu functions are GPL only, so we can't use them.
+dnl #		(nothing defined)
+dnl #
+dnl # 4.2:	Use __kernel_fpu_{begin,end}()
+dnl #		HAVE_UNDERSCORE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
+dnl #
+dnl # Pre-4.2:	Use kernel_fpu_{begin,end}()
+dnl #		HAVE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_FPU], [
-	AC_MSG_CHECKING([whether asm/fpu/api.h exists])
+	AC_MSG_CHECKING([which kernel_fpu function to use])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <asm/i387.h>
+		#include <asm/xcr.h>
+	],[
+		kernel_fpu_begin();
+		kernel_fpu_end();
+	],[
+		AC_MSG_RESULT(kernel_fpu_*)
+		AC_DEFINE(HAVE_KERNEL_FPU, 1, [kernel has kernel_fpu_* functions])
+		AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1, [kernel exports FPU functions])
+	],[
 		ZFS_LINUX_TRY_COMPILE([
 			#include <linux/kernel.h>
 			#include <asm/fpu/api.h>
 		],[
 			__kernel_fpu_begin();
+			__kernel_fpu_end();
 		],[
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_FPU_API_H, 1, [kernel has <asm/fpu/api.h> interface])
+			AC_MSG_RESULT(__kernel_fpu_*)
+			AC_DEFINE(HAVE_UNDERSCORE_KERNEL_FPU, 1, [kernel has __kernel_fpu_* functions])
+			AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1, [kernel exports FPU functions])
 		],[
-		AC_MSG_RESULT(no)
+			AC_MSG_RESULT(not exported)
+		])
 	])
 ])

config/kernel-fst-mount.m4

@@ -0,0 +1,28 @@
+dnl #
+dnl # 2.6.38 API change
+dnl # The .get_sb callback has been replaced by a .mount callback
+dnl # in the file_system_type structure.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_FST_MOUNT], [
+        AC_MSG_CHECKING([whether fst->mount() exists])
+        ZFS_LINUX_TRY_COMPILE([
+                #include <linux/fs.h>
+
+                static struct dentry *
+                mount(struct file_system_type *fs_type, int flags,
+                    const char *osname, void *data) {
+                        struct dentry *d = NULL;
+                        return (d);
+                }
+
+                static struct file_system_type fst __attribute__ ((unused)) = {
+                        .mount = mount,
+                };
+        ],[
+        ],[
+                AC_MSG_RESULT(yes)
+                AC_DEFINE(HAVE_FST_MOUNT, 1, [fst->mount() exists])
+        ],[
+                AC_MSG_RESULT(no)
+        ])
+])

config/kernel-in-compat-syscall.m4

@@ -0,0 +1,20 @@
+dnl #
+dnl # 4.5 API change
+dnl # Added in_compat_syscall() which can be overridden on a per-
+dnl # architecture basis.  Prior to this is_compat_task() was the
+dnl # provided interface.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_IN_COMPAT_SYSCALL], [
+	AC_MSG_CHECKING([whether in_compat_syscall() is available])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/compat.h>
+	],[
+		in_compat_syscall();
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_IN_COMPAT_SYSCALL, 1,
+		    [in_compat_syscall() is available])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-misc-minor.m4

@@ -0,0 +1,26 @@
+dnl #
+dnl # Determine an available miscellaneous minor number which can be used
+dnl # for the /dev/zfs device.  This is needed because kernel module
+dnl # auto-loading depends on registering a reserved non-conflicting minor
+dnl # number.  Start with a large known available unreserved minor and work
+dnl # our way down to lower value if a collision is detected.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_MISC_MINOR], [
+	AC_MSG_CHECKING([for available /dev/zfs minor])
+
+	for i in $(seq 249 -1 200); do
+		if ! grep -q "^#define\s\+.*_MINOR\s\+.*$i" \
+		    ${LINUX}/include/linux/miscdevice.h; then
+			ZFS_DEVICE_MINOR="$i"
+			AC_MSG_RESULT($ZFS_DEVICE_MINOR)
+			AC_DEFINE_UNQUOTED([ZFS_DEVICE_MINOR],
+			    [$ZFS_DEVICE_MINOR], [/dev/zfs minor])
+			break
+		fi
+	done
+
+	AS_IF([ test -z "$ZFS_DEVICE_MINOR"], [
+		AC_MSG_ERROR([
+	*** No available misc minor numbers available for use.])
+	])
+])

config/kernel-mount-nodev.m4

@@ -1,20 +0,0 @@
-dnl #
-dnl # 2.6.39 API change
-dnl # The .get_sb callback has been replaced by a .mount callback
-dnl # in the file_system_type structure.  When using the new
-dnl # interface the caller must now use the mount_nodev() helper.
-dnl # This updated callback and helper no longer pass the vfsmount.
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_MOUNT_NODEV],
-	[AC_MSG_CHECKING([whether mount_nodev() is available])
-	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		#include <linux/fs.h>
-	], [
-		mount_nodev(NULL, 0, NULL, NULL);
-	], [mount_nodev], [fs/super.c], [
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_MOUNT_NODEV, 1, [mount_nodev() is available])
-	], [
-		AC_MSG_RESULT(no)
-	])
-])

config/kernel-vfs-iterate.m4

@@ -23,16 +23,27 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
 		dnl #
 		dnl # 3.11 API change
 		dnl #
+		dnl # RHEL 7.5 compatibility; the fops.iterate() method was
+		dnl # added to the file_operations structure but in order to
+		dnl # maintain KABI compatibility all callers must set
+		dnl # FMODE_KABI_ITERATE which is checked in iterate_dir().
+		dnl # When detected ignore this interface and fallback to
+		dnl # to using fops.readdir() to retain KABI compatibility.
+		dnl #
 		AC_MSG_CHECKING([whether fops->iterate() is available])
 		ZFS_LINUX_TRY_COMPILE([
 			#include <linux/fs.h>
-			int iterate(struct file *filp, struct dir_context * context)
-			    { return 0; }
+			int iterate(struct file *filp,
+			    struct dir_context *context) { return 0; }
 
 			static const struct file_operations fops
 			    __attribute__ ((unused)) = {
 				.iterate	 = iterate,
 			};
+
+			#if defined(FMODE_KABI_ITERATE)
+			#error "RHEL 7.5, FMODE_KABI_ITERATE interface"
+			#endif
 		],[
 		],[
 			AC_MSG_RESULT(yes)
@@ -44,8 +55,8 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
 			AC_MSG_CHECKING([whether fops->readdir() is available])
 			ZFS_LINUX_TRY_COMPILE([
 				#include <linux/fs.h>
-				int readdir(struct file *filp, void *entry, filldir_t func)
-				    { return 0; }
+				int readdir(struct file *filp, void *entry,
+				    filldir_t func) { return 0; }
 
 				static const struct file_operations fops
 				    __attribute__ ((unused)) = {
@@ -57,7 +68,7 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
 				AC_DEFINE(HAVE_VFS_READDIR, 1,
 					  [fops->readdir() is available])
 			],[
-				AC_MSG_ERROR(no; file a bug report with ZFSOnLinux)
+				AC_MSG_ERROR(no; file a bug report with ZoL)
 			])
 		])
 	])

config/kernel.m4

@@ -5,14 +5,16 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL
 	ZFS_AC_SPL
 	ZFS_AC_QAT
+	ZFS_AC_KERNEL_ACCESS_OK_TYPE
 	ZFS_AC_TEST_MODULE
+	ZFS_AC_KERNEL_MISC_MINOR
 	ZFS_AC_KERNEL_OBJTOOL
 	ZFS_AC_KERNEL_CONFIG
 	ZFS_AC_KERNEL_DECLARE_EVENT_CLASS
 	ZFS_AC_KERNEL_CURRENT_BIO_TAIL
 	ZFS_AC_KERNEL_SUPER_USER_NS
 	ZFS_AC_KERNEL_SUBMIT_BIO
-	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
+	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
 	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
 	ZFS_AC_KERNEL_TYPE_FMODE_T
 	ZFS_AC_KERNEL_3ARG_BLKDEV_GET
@@ -35,6 +37,8 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_BIO_RW_BARRIER
 	ZFS_AC_KERNEL_BIO_RW_DISCARD
 	ZFS_AC_KERNEL_BLK_QUEUE_BDI
+	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_CLEAR
+	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET
 	ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
 	ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
 	ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
@@ -100,7 +104,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
 	ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
-	ZFS_AC_KERNEL_MOUNT_NODEV
+	ZFS_AC_KERNEL_FST_MOUNT
 	ZFS_AC_KERNEL_SHRINK
 	ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
 	ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
@@ -127,6 +131,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_GLOBAL_PAGE_STATE
 	ZFS_AC_KERNEL_ACL_HAS_REFCOUNT
 	ZFS_AC_KERNEL_USERNS_CAPABILITIES
+	ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
 
 	AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
 		KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
@@ -252,7 +257,7 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 	AS_IF([test "$utsrelease"], [
 		kernsrcver=`(echo "#include <$utsrelease>";
 		             echo "kernsrcver=UTS_RELEASE") |
-		             cpp -I $kernelbuild/include |
+		             ${CPP} -I $kernelbuild/include - |
 		             grep "^kernsrcver=" | cut -d \" -f 2`
 
 		AS_IF([test -z "$kernsrcver"], [

config/user-libaio.m4

@@ -0,0 +1,14 @@
+dnl #
+dnl # Check for libaio - only used for libaiot test cases.
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_USER_LIBAIO], [
+	LIBAIO=
+
+	AC_CHECK_HEADER([libaio.h], [
+	    user_libaio=yes
+	    AC_SUBST([LIBAIO], ["-laio"])
+	    AC_DEFINE([HAVE_LIBAIO], 1, [Define if you have libaio])
+	], [
+	    user_libaio=no
+	])
+])

config/user-libattr.m4

@@ -1,12 +0,0 @@
-dnl #
-dnl # Check for libattr
-dnl #
-AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATTR], [
-	LIBATTR=
-
-	AC_CHECK_HEADER([attr/xattr.h], [], [AC_MSG_FAILURE([
-	*** attr/xattr.h missing, libattr-devel package required])])
-
-	AC_SUBST([LIBATTR], ["-lattr"])
-	AC_DEFINE([HAVE_LIBATTR], 1, [Define if you have libattr])
-])

config/user.m4

@@ -11,9 +11,9 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
 	ZFS_AC_CONFIG_USER_LIBUUID
 	ZFS_AC_CONFIG_USER_LIBTIRPC
 	ZFS_AC_CONFIG_USER_LIBBLKID
-	ZFS_AC_CONFIG_USER_LIBATTR
 	ZFS_AC_CONFIG_USER_LIBUDEV
 	ZFS_AC_CONFIG_USER_FRAME_LARGER_THAN
+	ZFS_AC_CONFIG_USER_LIBAIO
 	ZFS_AC_CONFIG_USER_RUNSTATEDIR
 	ZFS_AC_CONFIG_USER_MAKEDEV_IN_SYSMACROS
 	ZFS_AC_CONFIG_USER_MAKEDEV_IN_MKDEV

config/zfs-build.m4

@@ -10,7 +10,6 @@ AC_DEFUN([ZFS_AC_DEBUG_ENABLE], [
 	KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 	HOSTCFLAGS="${HOSTCFLAGS} -DDEBUG -Werror"
 	DEBUG_CFLAGS="-DDEBUG -Werror"
-	DEBUG_STACKFLAGS="-fstack-check"
 	DEBUG_ZFS="_with_debug"
 	AC_DEFINE(ZFS_DEBUG, 1, [zfs debugging enabled])
 ])
@@ -118,11 +117,11 @@ AC_DEFUN([ZFS_AC_CONFIG], [
 	AM_CONDITIONAL([CONFIG_KERNEL],
 	    [test "$ZFS_CONFIG" = kernel -o "$ZFS_CONFIG" = all] &&
 	    [test "x$enable_linux_builtin" != xyes ])
-	AM_CONDITIONAL([WANT_DEVNAME2DEVID],
-	    [test "x$user_libudev" = xyes ])
 	AM_CONDITIONAL([CONFIG_QAT],
 	    [test "$ZFS_CONFIG" = kernel -o "$ZFS_CONFIG" = all] &&
 	    [test "x$qatsrc" != x ])
+	AM_CONDITIONAL([WANT_DEVNAME2DEVID], [test "x$user_libudev" = xyes ])
+	AM_CONDITIONAL([WANT_MMAP_LIBAIO], [test "x$user_libaio" = xyes ])
 ])
 
 dnl #
@@ -160,7 +159,27 @@ AC_DEFUN([ZFS_AC_RPM], [
 	])
 
 	RPM_DEFINE_COMMON='--define "$(DEBUG_ZFS) 1"'
-	RPM_DEFINE_UTIL='--define "_dracutdir $(dracutdir)" --define "_udevdir $(udevdir)" --define "_udevruledir $(udevruledir)" --define "_initconfdir $(DEFAULT_INITCONF_DIR)" $(DEFINE_INITRAMFS) $(DEFINE_SYSTEMD)'
+
+
+	RPM_DEFINE_UTIL=' --define "_initconfdir $(DEFAULT_INITCONF_DIR)"'
+
+        dnl # Make the next three RPM_DEFINE_UTIL additions conditional, since
+        dnl # their values may not be set when running:
+        dnl #
+        dnl #   ./configure --with-config=srpm
+        dnl #
+        AS_IF([test -n "$dracutdir" ], [
+                RPM_DEFINE_UTIL='--define "_dracutdir $(dracutdir)"'
+        ])
+        AS_IF([test -n "$udevdir" ], [
+                RPM_DEFINE_UTIL+=' --define "_udevdir $(udevdir)"'
+        ])
+        AS_IF([test -n "$udevruledir" ], [
+                RPM_DEFINE_UTIL+=' --define "_udevdir $(udevruledir)"'
+        ])
+        RPM_DEFINE_UTIL+=' $(DEFINE_INITRAMFS)'
+        RPM_DEFINE_UTIL+=' $(DEFINE_SYSTEMD)'
+
 	RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)" --define "require_spldir $(SPL)" --define "require_splobj $(SPL_OBJ)" --define "ksrc $(LINUX)" --define "kobj $(LINUX_OBJ)"'
 	RPM_DEFINE_KMOD+=' --define "_wrong_version_format_terminate_build 0"'
 

configure.ac

@@ -122,6 +122,9 @@ AC_CONFIG_FILES([
 	contrib/dracut/02zfsexpandknowledge/Makefile
 	contrib/dracut/90zfs/Makefile
 	contrib/initramfs/Makefile
+	contrib/initramfs/hooks/Makefile
+	contrib/initramfs/scripts/Makefile
+	contrib/initramfs/scripts/local-top/Makefile
 	module/Makefile
 	module/avl/Makefile
 	module/nvpair/Makefile
@@ -165,6 +168,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/cmd/mkfiles/Makefile
 	tests/zfs-tests/cmd/mktree/Makefile
 	tests/zfs-tests/cmd/mmap_exec/Makefile
+	tests/zfs-tests/cmd/mmap_libaio/Makefile
 	tests/zfs-tests/cmd/mmapwrite/Makefile
 	tests/zfs-tests/cmd/randfree_file/Makefile
 	tests/zfs-tests/cmd/readmmap/Makefile
@@ -237,6 +241,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/tests/functional/cli_user/zpool_iostat/Makefile
 	tests/zfs-tests/tests/functional/cli_user/zpool_list/Makefile
 	tests/zfs-tests/tests/functional/compression/Makefile
+	tests/zfs-tests/tests/functional/cp_files/Makefile
 	tests/zfs-tests/tests/functional/ctime/Makefile
 	tests/zfs-tests/tests/functional/delegate/Makefile
 	tests/zfs-tests/tests/functional/devices/Makefile
@@ -251,6 +256,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/tests/functional/history/Makefile
 	tests/zfs-tests/tests/functional/inheritance/Makefile
 	tests/zfs-tests/tests/functional/inuse/Makefile
+	tests/zfs-tests/tests/functional/kstat/Makefile
 	tests/zfs-tests/tests/functional/large_files/Makefile
 	tests/zfs-tests/tests/functional/largest_pool/Makefile
 	tests/zfs-tests/tests/functional/link_count/Makefile

contrib/dracut/90zfs/Makefile.am

@@ -24,6 +24,7 @@ $(pkgdracut_SCRIPTS):%:%.in
 		-e 's,@udevruledir\@,$(udevruledir),g' \
 		-e 's,@sysconfdir\@,$(sysconfdir),g' \
 		-e 's,@systemdunitdir\@,$(systemdunitdir),g' \
+		-e 's,@mounthelperdir\@,$(mounthelperdir),g' \
 		$< >'$@'
 
 distclean-local::

contrib/dracut/90zfs/module-setup.sh.in

@@ -5,7 +5,7 @@ check() {
 	[ "${1}" = "-d" ] && return 0
 
 	# Verify the zfs tool chain
-	for tool in "@sbindir@/zpool" "@sbindir@/zfs" "@sbindir@/mount.zfs" ; do
+	for tool in "@sbindir@/zpool" "@sbindir@/zfs" "@mounthelperdir@/mount.zfs" ; do
 		test -x "$tool" || return 1
 	done
 	# Verify grep exists
@@ -53,7 +53,7 @@ install() {
 		# Fallback: Guess the path and include all matches
 		dracut_install /usr/lib/gcc/*/*/libgcc_s.so*
 	fi
-	dracut_install @sbindir@/mount.zfs
+	dracut_install @mounthelperdir@/mount.zfs
 	dracut_install @udevdir@/vdev_id
 	dracut_install awk
 	dracut_install head

contrib/dracut/90zfs/mount-zfs.sh.in

@@ -34,6 +34,7 @@ info "ZFS: No sysroot.mount exists or zfs-generator did not extend it."
 info "ZFS: Mounting root with the traditional mount-zfs.sh instead."
 
 # Delay until all required block devices are present.
+modprobe zfs 2>/dev/null
 udevadm settle
 
 if [ "${root}" = "zfs:AUTO" ] ; then

contrib/initramfs/Makefile.am

@@ -3,12 +3,11 @@ initrddir = $(datarootdir)/initramfs-tools
 initrd_SCRIPTS = \
 	conf.d/zfs conf-hooks.d/zfs hooks/zfs scripts/zfs scripts/local-top/zfs
 
+SUBDIRS = hooks scripts
+
 EXTRA_DIST = \
 	$(top_srcdir)/contrib/initramfs/conf.d/zfs \
 	$(top_srcdir)/contrib/initramfs/conf-hooks.d/zfs \
-	$(top_srcdir)/contrib/initramfs/hooks/zfs \
-	$(top_srcdir)/contrib/initramfs/scripts/zfs \
-	$(top_srcdir)/contrib/initramfs/scripts/local-top/zfs \
 	$(top_srcdir)/contrib/initramfs/README.initramfs.markdown
 
 install-initrdSCRIPTS: $(EXTRA_DIST)

contrib/initramfs/hooks/.gitignore

@@ -0,0 +1 @@
+zfs

contrib/initramfs/hooks/Makefile.am

@@ -0,0 +1,21 @@
+hooksdir = $(datarootdir)/initramfs-tools/hooks
+
+hooks_SCRIPTS = \
+	zfs
+
+EXTRA_DIST = \
+	$(top_srcdir)/contrib/initramfs/hooks/zfs.in
+
+$(hooks_SCRIPTS):%:%.in
+	-$(SED) -e 's,@sbindir\@,$(sbindir),g' \
+		-e 's,@sysconfdir\@,$(sysconfdir),g' \
+		-e 's,@udevdir\@,$(udevdir),g' \
+		-e 's,@udevruledir\@,$(udevruledir),g' \
+		-e 's,@mounthelperdir\@,$(mounthelperdir),g' \
+		$< >'$@'
+
+clean-local::
+	-$(RM) $(hooks_SCRIPTS)
+
+distclean-local::
+	-$(RM) $(hooks_SCRIPTS)

contrib/initramfs/hooks/zfs.in

@@ -8,11 +8,13 @@ PREREQ="zdev"
 
 # These prerequisites are provided by the zfsutils package. The zdb utility is
 # not strictly required, but it can be useful at the initramfs recovery prompt.
-COPY_EXEC_LIST="/sbin/zdb /sbin/zpool /sbin/zfs /sbin/mount.zfs"
-COPY_EXEC_LIST="$COPY_EXEC_LIST /usr/bin/dirname /lib/udev/vdev_id"
-COPY_FILE_LIST="/etc/hostid /etc/zfs/zpool.cache /etc/default/zfs"
-COPY_FILE_LIST="$COPY_FILE_LIST /etc/zfs/zfs-functions /etc/zfs/vdev_id.conf"
-COPY_FILE_LIST="$COPY_FILE_LIST /lib/udev/rules.d/69-vdev.rules"
+COPY_EXEC_LIST="@sbindir@/zdb @sbindir@/zpool @sbindir@/zfs"
+COPY_EXEC_LIST="$COPY_EXEC_LIST @mounthelperdir@/mount.zfs @udevdir@/vdev_id"
+COPY_FILE_LIST="/etc/hostid @sysconfdir@/zfs/zpool.cache"
+COPY_FILE_LIST="$COPY_FILE_LIST @sysconfdir@/default/zfs"
+COPY_FILE_LIST="$COPY_FILE_LIST @sysconfdir@/zfs/zfs-functions"
+COPY_FILE_LIST="$COPY_FILE_LIST @sysconfdir@/zfs/vdev_id.conf"
+COPY_FILE_LIST="$COPY_FILE_LIST @udevruledir@/69-vdev.rules"
 
 # These prerequisites are provided by the base system.
 COPY_EXEC_LIST="$COPY_EXEC_LIST /usr/bin/dirname /bin/hostname /sbin/blkid"

contrib/initramfs/scripts/.gitignore

@@ -0,0 +1 @@
+zfs

contrib/initramfs/scripts/Makefile.am

@@ -0,0 +1,20 @@
+scriptsdir = $(datarootdir)/initramfs-tools/scripts
+
+scripts_SCRIPTS = \
+	zfs
+
+SUBDIRS = local-top
+
+EXTRA_DIST = \
+	$(top_srcdir)/contrib/initramfs/scripts/zfs.in
+
+$(scripts_SCRIPTS):%:%.in
+	-$(SED) -e 's,@sbindir\@,$(sbindir),g' \
+		-e 's,@sysconfdir\@,$(sysconfdir),g' \
+		$< >'$@'
+
+clean-local::
+	-$(RM) $(scripts_SCRIPTS)
+
+distclean-local::
+	-$(RM) $(scripts_SCRIPTS)

contrib/initramfs/scripts/local-top/Makefile.am

@@ -0,0 +1,3 @@
+localtopdir = $(datarootdir)/initramfs-tools/scripts/local-top
+
+EXTRA_DIST = zfs

contrib/initramfs/scripts/zfs.in

@@ -11,9 +11,9 @@
 
 # Paths to what we need - in the initrd, these paths are hardcoded,
 # so override the defines in zfs-functions.
-ZFS="/sbin/zfs"
-ZPOOL="/sbin/zpool"
-ZPOOL_CACHE="/etc/zfs/zpool.cache"
+ZFS="@sbindir@/zfs"
+ZPOOL="@sbindir@/zpool"
+ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"
 export ZFS ZPOOL ZPOOL_CACHE
 
 # This runs any scripts that should run before we start importing
@@ -193,7 +193,7 @@ import_pool()
 
 	# Verify that the pool isn't already imported
 	# Make as sure as we can to not require '-f' to import.
-	"${ZPOOL}" status "$pool" > /dev/null 2>&1 && return 0
+	"${ZPOOL}" get name,guid -o value -H 2>/dev/null | grep -Fxq "$pool" && return 0
 
 	# For backwards compatibility, make sure that ZPOOL_IMPORT_PATH is set
 	# to something we can use later with the real import(s). We want to
@@ -772,6 +772,7 @@ mountroot()
 	#	root=zfs:<pool>/<dataset>	(uses this for rpool - first part, without 'zfs:')
 	#
 	# Option <dataset> could also be <snapshot>
+	# Option <pool> could also be <guid>
 
 	# ------------
 	# Support force option
@@ -889,6 +890,14 @@ mountroot()
 		/bin/sh
 	fi
 
+	# In case the pool was specified as guid, resolve guid to name
+	pool="$("${ZPOOL}" get name,guid -o name,value -H | \
+	    awk -v pool="${ZFS_RPOOL}" '$2 == pool { print $1 }')"
+	if [ -n "$pool" ]; then
+		ZFS_BOOTFS="${pool}/${ZFS_BOOTFS#*/}"
+		ZFS_RPOOL="${pool}"
+	fi
+
 	# Set elevator=noop on the root pool's vdevs' disks.  ZFS already
 	# does this for wholedisk vdevs (for all pools), so this is only
 	# important for partitions.

etc/modules-load.d/zfs.conf.in

@@ -1,3 +1,3 @@
-# Always load kernel modules at boot.  The default behavior is to load the
-# kernel modules in the zfs-import-*.service or when blkid(8) detects a pool.
+# The default behavior is to allow udev to load the kernel modules on demand.
+# Uncomment the following line to unconditionally load them at boot.
 #zfs

etc/systemd/system/zfs-import-cache.service.in

@@ -12,7 +12,6 @@ ConditionPathExists=@sysconfdir@/zfs/zpool.cache
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-ExecStartPre=-/sbin/modprobe zfs
 ExecStart=@sbindir@/zpool import -c @sysconfdir@/zfs/zpool.cache -aN
 
 [Install]

etc/systemd/system/zfs-import-scan.service.in

@@ -11,7 +11,6 @@ ConditionPathExists=!@sysconfdir@/zfs/zpool.cache
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-ExecStartPre=-/sbin/modprobe zfs
 ExecStart=@sbindir@/zpool import -aN -o cachefile=none
 
 [Install]

etc/zfs/Makefile.am

@@ -4,6 +4,7 @@ pkgsysconf_DATA = \
 	vdev_id.conf.alias.example \
 	vdev_id.conf.sas_direct.example \
 	vdev_id.conf.sas_switch.example \
-	vdev_id.conf.multipath.example
+	vdev_id.conf.multipath.example \
+	vdev_id.conf.scsi.example
 
 EXTRA_DIST = $(pkgsysconf_DATA)

etc/zfs/vdev_id.conf.sas_direct.example

@@ -2,6 +2,9 @@ multipath     no
 topology      sas_direct
 phys_per_port 4
 
+# Additionally create /dev/by-enclousure/ symlinks for enclosure devices
+enclosure_symlinks	yes
+
 #       PCI_ID  HBA PORT  CHANNEL NAME
 channel 85:00.0 1         A
 channel 85:00.0 0         B

etc/zfs/vdev_id.conf.scsi.example

@@ -0,0 +1,9 @@
+multipath     no
+topology      scsi
+phys_per_port 1
+# Usually scsi disks are numbered from 0, but this can be offset, to
+# match the physical bay numbers, as follows:
+first_bay_number 1
+
+#       PCI_ID  HBA PORT  CHANNEL NAME
+channel 0c:00.0 0         Y

include/libzfs.h

@@ -296,6 +296,8 @@ int zfs_dev_is_whole_disk(char *dev_name);
 char *zfs_get_underlying_path(char *dev_name);
 char *zfs_get_enclosure_sysfs_path(char *dev_name);
 
+const char *zpool_get_state_str(zpool_handle_t *);
+
 /*
  * Functions to manage pool properties
  */
@@ -331,6 +333,7 @@ typedef enum {
 	ZPOOL_STATUS_HOSTID_REQUIRED,	/* multihost=on and hostid=0 */
 	ZPOOL_STATUS_IO_FAILURE_WAIT,	/* failed I/O, failmode 'wait' */
 	ZPOOL_STATUS_IO_FAILURE_CONTINUE, /* failed I/O, failmode 'continue' */
+	ZPOOL_STATUS_IO_FAILURE_MMP,	/* failed MMP, failmode not 'panic' */
 	ZPOOL_STATUS_BAD_LOG,		/* cannot read log chain(s) */
 	ZPOOL_STATUS_ERRATA,		/* informational errata available */
 

include/linux/blkdev_compat.h

@@ -32,11 +32,28 @@
 #include <linux/blkdev.h>
 #include <linux/elevator.h>
 #include <linux/backing-dev.h>
+#include <linux/msdos_fs.h>	/* for SECTOR_* */
 
 #ifndef HAVE_FMODE_T
 typedef unsigned __bitwise__ fmode_t;
 #endif /* HAVE_FMODE_T */
 
+#ifndef HAVE_BLK_QUEUE_FLAG_SET
+static inline void
+blk_queue_flag_set(unsigned int flag, struct request_queue *q)
+{
+	queue_flag_set(flag, q);
+}
+#endif
+
+#ifndef HAVE_BLK_QUEUE_FLAG_CLEAR
+static inline void
+blk_queue_flag_clear(unsigned int flag, struct request_queue *q)
+{
+	queue_flag_clear(flag, q);
+}
+#endif
+
 /*
  * 4.7 - 4.x API,
  * The blk_queue_write_cache() interface has replaced blk_queue_flush()
@@ -56,16 +73,14 @@ static inline void
 blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua)
 {
 #if defined(HAVE_BLK_QUEUE_WRITE_CACHE_GPL_ONLY)
-	spin_lock_irq(q->queue_lock);
 	if (wc)
-		queue_flag_set(QUEUE_FLAG_WC, q);
+		blk_queue_flag_set(QUEUE_FLAG_WC, q);
 	else
-		queue_flag_clear(QUEUE_FLAG_WC, q);
+		blk_queue_flag_clear(QUEUE_FLAG_WC, q);
 	if (fua)
-		queue_flag_set(QUEUE_FLAG_FUA, q);
+		blk_queue_flag_set(QUEUE_FLAG_FUA, q);
 	else
-		queue_flag_clear(QUEUE_FLAG_FUA, q);
-	spin_unlock_irq(q->queue_lock);
+		blk_queue_flag_clear(QUEUE_FLAG_FUA, q);
 #elif defined(HAVE_BLK_QUEUE_WRITE_CACHE)
 	blk_queue_write_cache(q, wc, fua);
 #elif defined(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY)
@@ -90,17 +105,6 @@ blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua)
 #define	blk_fs_request(rq)	((rq)->cmd_type == REQ_TYPE_FS)
 #endif
 
-/*
- * 2.6.27 API change,
- * The blk_queue_stackable() queue flag was added in 2.6.27 to handle dm
- * stacking drivers.  Prior to this request stacking drivers were detected
- * by checking (q->request_fn == NULL), for earlier kernels we revert to
- * this legacy behavior.
- */
-#ifndef blk_queue_stackable
-#define	blk_queue_stackable(q)	((q)->request_fn == NULL)
-#endif
-
 /*
  * 2.6.34 API change,
  * The blk_queue_max_hw_sectors() function replaces blk_queue_max_sectors().

include/linux/kmap_compat.h

@@ -27,6 +27,7 @@
 #define	_ZFS_KMAP_H
 
 #include <linux/highmem.h>
+#include <linux/uaccess.h>
 
 #ifdef HAVE_1ARG_KMAP_ATOMIC
 /* 2.6.37 API change */
@@ -37,4 +38,11 @@
 #define	zfs_kunmap_atomic(addr, km_type)	kunmap_atomic(addr, km_type)
 #endif
 
+/* 5.0 API change - no more 'type' argument for access_ok() */
+#ifdef HAVE_ACCESS_OK_TYPE
+#define	zfs_access_ok(type, addr, size)	access_ok(type, addr, size)
+#else
+#define	zfs_access_ok(type, addr, size)	access_ok(addr, size)
+#endif
+
 #endif	/* _ZFS_KMAP_H */

include/linux/simd_x86.h

@@ -81,7 +81,7 @@
 #endif
 
 #if defined(_KERNEL)
-#if defined(HAVE_FPU_API_H)
+#if defined(HAVE_UNDERSCORE_KERNEL_FPU)
 #include <asm/fpu/api.h>
 #include <asm/fpu/internal.h>
 #define	kfpu_begin()		\
@@ -94,12 +94,18 @@
 	__kernel_fpu_end();		\
 	preempt_enable();		\
 }
-#else
+#elif defined(HAVE_KERNEL_FPU)
 #include <asm/i387.h>
 #include <asm/xcr.h>
 #define	kfpu_begin()	kernel_fpu_begin()
 #define	kfpu_end()		kernel_fpu_end()
-#endif /* defined(HAVE_FPU_API_H) */
+#else
+/* Kernel doesn't export any kernel_fpu_* functions */
+#include <asm/fpu/internal.h>	/* For kernel xgetbv() */
+#define	kfpu_begin() 	panic("This code should never run")
+#define	kfpu_end() 	panic("This code should never run")
+#endif /* defined(HAVE_KERNEL_FPU) */
+
 #else
 /*
  * fpu dummy methods for userspace
@@ -278,11 +284,13 @@ __simd_state_enabled(const uint64_t state)
 	boolean_t has_osxsave;
 	uint64_t xcr0;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_OSXSAVE)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_OSXSAVE) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_osxsave = !!boot_cpu_has(X86_FEATURE_OSXSAVE);
-#elif defined(_KERNEL) && !defined(X86_FEATURE_OSXSAVE)
-	has_osxsave = B_FALSE;
 #else
+	has_osxsave = B_FALSE;
+#endif
+#elif !defined(_KERNEL)
 	has_osxsave = __cpuid_has_osxsave();
 #endif
 
@@ -307,8 +315,12 @@ static inline boolean_t
 zfs_sse_available(void)
 {
 #if defined(_KERNEL)
+#if defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_XMM));
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_sse());
 #endif
 }
@@ -320,8 +332,12 @@ static inline boolean_t
 zfs_sse2_available(void)
 {
 #if defined(_KERNEL)
+#if defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_XMM2));
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_sse2());
 #endif
 }
@@ -333,8 +349,12 @@ static inline boolean_t
 zfs_sse3_available(void)
 {
 #if defined(_KERNEL)
+#if defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_XMM3));
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_sse3());
 #endif
 }
@@ -346,8 +366,12 @@ static inline boolean_t
 zfs_ssse3_available(void)
 {
 #if defined(_KERNEL)
+#if defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_SSSE3));
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_ssse3());
 #endif
 }
@@ -359,8 +383,12 @@ static inline boolean_t
 zfs_sse4_1_available(void)
 {
 #if defined(_KERNEL)
+#if defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_XMM4_1));
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_sse4_1());
 #endif
 }
@@ -372,8 +400,12 @@ static inline boolean_t
 zfs_sse4_2_available(void)
 {
 #if defined(_KERNEL)
+#if defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_XMM4_2));
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_sse4_2());
 #endif
 }
@@ -386,8 +418,12 @@ zfs_avx_available(void)
 {
 	boolean_t has_avx;
 #if defined(_KERNEL)
+#if defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx = !!boot_cpu_has(X86_FEATURE_AVX);
 #else
+	has_avx = B_FALSE;
+#endif
+#elif !defined(_KERNEL)
 	has_avx = __cpuid_has_avx();
 #endif
 
@@ -401,11 +437,13 @@ static inline boolean_t
 zfs_avx2_available(void)
 {
 	boolean_t has_avx2;
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX2)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX2) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx2 = !!boot_cpu_has(X86_FEATURE_AVX2);
-#elif defined(_KERNEL) && !defined(X86_FEATURE_AVX2)
-	has_avx2 = B_FALSE;
 #else
+	has_avx2 = B_FALSE;
+#endif
+#elif !defined(_KERNEL)
 	has_avx2 = __cpuid_has_avx2();
 #endif
 
@@ -418,11 +456,13 @@ zfs_avx2_available(void)
 static inline boolean_t
 zfs_bmi1_available(void)
 {
-#if defined(_KERNEL) && defined(X86_FEATURE_BMI1)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_BMI1) && defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_BMI1));
-#elif defined(_KERNEL) && !defined(X86_FEATURE_BMI1)
-	return (B_FALSE);
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_bmi1());
 #endif
 }
@@ -433,16 +473,17 @@ zfs_bmi1_available(void)
 static inline boolean_t
 zfs_bmi2_available(void)
 {
-#if defined(_KERNEL) && defined(X86_FEATURE_BMI2)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_BMI2) && defined(KERNEL_EXPORTS_X86_FPU)
 	return (!!boot_cpu_has(X86_FEATURE_BMI2));
-#elif defined(_KERNEL) && !defined(X86_FEATURE_BMI2)
-	return (B_FALSE);
 #else
+	return (B_FALSE);
+#endif
+#elif !defined(_KERNEL)
 	return (__cpuid_has_bmi2());
 #endif
 }
 
-
 /*
  * AVX-512 family of instruction sets:
  *
@@ -466,8 +507,12 @@ zfs_avx512f_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512F)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512F) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = !!boot_cpu_has(X86_FEATURE_AVX512F);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512f();
 #endif
@@ -481,9 +526,13 @@ zfs_avx512cd_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512CD)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512CD) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512CD);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512cd();
 #endif
@@ -497,9 +546,13 @@ zfs_avx512er_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512ER)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512ER) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512ER);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512er();
 #endif
@@ -513,9 +566,13 @@ zfs_avx512pf_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512PF)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512PF) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512PF);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512pf();
 #endif
@@ -529,9 +586,13 @@ zfs_avx512bw_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512BW)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512BW) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512BW);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512bw();
 #endif
@@ -545,9 +606,13 @@ zfs_avx512dq_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512DQ)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512DQ) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512DQ);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512dq();
 #endif
@@ -561,9 +626,13 @@ zfs_avx512vl_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512VL)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512VL) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512VL);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512vl();
 #endif
@@ -577,9 +646,13 @@ zfs_avx512ifma_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512IFMA)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512IFMA) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512IFMA);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512ifma();
 #endif
@@ -593,9 +666,13 @@ zfs_avx512vbmi_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL) && defined(X86_FEATURE_AVX512VBMI)
+#if defined(_KERNEL)
+#if defined(X86_FEATURE_AVX512VBMI) && defined(KERNEL_EXPORTS_X86_FPU)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512VBMI);
+#else
+	has_avx512 = B_FALSE;
+#endif
 #elif !defined(_KERNEL)
 	has_avx512 = __cpuid_has_avx512f() &&
 	    __cpuid_has_avx512vbmi();

include/linux/vfs_compat.h

@@ -30,6 +30,7 @@
 #include <sys/taskq.h>
 #include <sys/cred.h>
 #include <linux/backing-dev.h>
+#include <linux/compat.h>
 
 /*
  * 2.6.28 API change,
@@ -182,6 +183,30 @@ zpl_bdi_destroy(struct super_block *sb)
 }
 #endif
 
+/*
+ * 4.14 adds SB_* flag definitions, define them to MS_* equivalents
+ * if not set.
+ */
+#ifndef	SB_RDONLY
+#define	SB_RDONLY	MS_RDONLY
+#endif
+
+#ifndef	SB_SILENT
+#define	SB_SILENT	MS_SILENT
+#endif
+
+#ifndef	SB_ACTIVE
+#define	SB_ACTIVE	MS_ACTIVE
+#endif
+
+#ifndef	SB_POSIXACL
+#define	SB_POSIXACL	MS_POSIXACL
+#endif
+
+#ifndef	SB_MANDLOCK
+#define	SB_MANDLOCK	MS_MANDLOCK
+#endif
+
 /*
  * 2.6.38 API change,
  * LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
@@ -272,9 +297,6 @@ lseek_execute(
  * This is several orders of magnitude larger than expected grace period.
  * At 60 seconds the kernel will also begin issuing RCU stall warnings.
  */
-#ifdef refcount_t
-#undef refcount_t
-#endif
 
 #include <linux/posix_acl.h>
 
@@ -405,8 +427,6 @@ typedef mode_t zpl_equivmode_t;
 #define	zpl_posix_acl_valid(ip, acl)  posix_acl_valid(acl)
 #endif
 
-#define	refcount_t	zfs_refcount_t
-
 #endif /* CONFIG_FS_POSIX_ACL */
 
 /*
@@ -602,4 +622,21 @@ inode_set_iversion(struct inode *ip, u64 val)
 }
 #endif
 
+/*
+ * Returns true when called in the context of a 32-bit system call.
+ */
+static inline int
+zpl_is_32bit_api(void)
+{
+#ifdef CONFIG_COMPAT
+#ifdef HAVE_IN_COMPAT_SYSCALL
+	return (in_compat_syscall());
+#else
+	return (is_compat_task());
+#endif
+#else
+	return (BITS_PER_LONG == 32);
+#endif
+}
+
 #endif /* _ZFS_VFS_H */

include/sys/abd.h

@@ -52,7 +52,7 @@ typedef struct abd {
 	abd_flags_t	abd_flags;
 	uint_t		abd_size;	/* excludes scattered abd_offset */
 	struct abd	*abd_parent;
-	refcount_t	abd_children;
+	zfs_refcount_t	abd_children;
 	union {
 		struct abd_scatter {
 			uint_t		abd_offset;

include/sys/arc.h

@@ -76,7 +76,7 @@ struct arc_prune {
 	void			*p_private;
 	uint64_t		p_adjust;
 	list_node_t		p_node;
-	refcount_t		p_refcnt;
+	zfs_refcount_t		p_refcnt;
 };
 
 typedef enum arc_strategy {

include/sys/arc_impl.h

@@ -74,12 +74,12 @@ typedef struct arc_state {
 	/*
 	 * total amount of evictable data in this state
 	 */
-	refcount_t arcs_esize[ARC_BUFC_NUMTYPES];
+	zfs_refcount_t arcs_esize[ARC_BUFC_NUMTYPES];
 	/*
 	 * total amount of data in this state; this includes: evictable,
 	 * non-evictable, ARC_BUFC_DATA, and ARC_BUFC_METADATA.
 	 */
-	refcount_t arcs_size;
+	zfs_refcount_t arcs_size;
 	/*
 	 * supports the "dbufs" kstat
 	 */
@@ -163,7 +163,7 @@ typedef struct l1arc_buf_hdr {
 	uint32_t		b_l2_hits;
 
 	/* self protecting */
-	refcount_t		b_refcnt;
+	zfs_refcount_t		b_refcnt;
 
 	arc_callback_t		*b_acb;
 	abd_t			*b_pabd;
@@ -180,7 +180,7 @@ typedef struct l2arc_dev {
 	kmutex_t		l2ad_mtx;	/* lock for buffer list */
 	list_t			l2ad_buflist;	/* buffer list */
 	list_node_t		l2ad_node;	/* device list node */
-	refcount_t		l2ad_alloc;	/* allocated bytes */
+	zfs_refcount_t		l2ad_alloc;	/* allocated bytes */
 } l2arc_dev_t;
 
 typedef struct l2arc_buf_hdr {

include/sys/dbuf.h

@@ -20,7 +20,7 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  */
@@ -212,7 +212,7 @@ typedef struct dmu_buf_impl {
 	 * If nonzero, the buffer can't be destroyed.
 	 * Protected by db_mtx.
 	 */
-	refcount_t db_holds;
+	zfs_refcount_t db_holds;
 
 	/* buffer holding our data */
 	arc_buf_t *db_buf;
@@ -294,7 +294,7 @@ boolean_t dbuf_try_add_ref(dmu_buf_t *db, objset_t *os, uint64_t obj,
 uint64_t dbuf_refcount(dmu_buf_impl_t *db);
 
 void dbuf_rele(dmu_buf_impl_t *db, void *tag);
-void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag);
+void dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting);
 
 dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
     uint64_t blkid);

include/sys/dmu.h

@@ -227,11 +227,14 @@ typedef enum dmu_object_type {
 	DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE),
 } dmu_object_type_t;
 
-typedef enum txg_how {
-	TXG_WAIT = 1,
-	TXG_NOWAIT,
-	TXG_WAITED,
-} txg_how_t;
+/*
+ * These flags are intended to be used to specify the "txg_how"
+ * parameter when calling the dmu_tx_assign() function. See the comment
+ * above dmu_tx_assign() for more details on the meaning of these flags.
+ */
+#define	TXG_NOWAIT	(0ULL)
+#define	TXG_WAIT	(1ULL<<0)
+#define	TXG_NOTHROTTLE	(1ULL<<1)
 
 void byteswap_uint64_array(void *buf, size_t size);
 void byteswap_uint32_array(void *buf, size_t size);
@@ -694,7 +697,7 @@ void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object);
 void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow);
 void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size);
 void dmu_tx_abort(dmu_tx_t *tx);
-int dmu_tx_assign(dmu_tx_t *tx, enum txg_how txg_how);
+int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
 void dmu_tx_wait(dmu_tx_t *tx);
 void dmu_tx_commit(dmu_tx_t *tx);
 void dmu_tx_mark_netfree(dmu_tx_t *tx);
@@ -891,7 +894,7 @@ uint64_t dmu_objset_fsid_guid(objset_t *os);
 /*
  * Get the [cm]time for an objset's snapshot dir
  */
-timestruc_t dmu_objset_snap_cmtime(objset_t *os);
+inode_timespec_t dmu_objset_snap_cmtime(objset_t *os);
 
 int dmu_objset_is_snapshot(objset_t *os);
 

include/sys/dmu_impl.h

@@ -161,6 +161,7 @@ extern "C" {
  * 	dn_allocated_txg
  * 	dn_free_txg
  * 	dn_assigned_txg
+ * 	dn_dirty_txg
  * 	dd_assigned_tx
  * 	dn_notxholds
  * 	dn_dirtyctx

include/sys/dmu_objset.h

@@ -179,7 +179,7 @@ int dmu_objset_find_dp(struct dsl_pool *dp, uint64_t ddobj,
     int func(struct dsl_pool *, struct dsl_dataset *, void *),
     void *arg, int flags);
 void dmu_objset_evict_dbufs(objset_t *os);
-timestruc_t dmu_objset_snap_cmtime(objset_t *os);
+inode_timespec_t dmu_objset_snap_cmtime(objset_t *os);
 
 /* called from dsl */
 void dmu_objset_sync(objset_t *os, zio_t *zio, dmu_tx_t *tx);

include/sys/dmu_tx.h

@@ -67,9 +67,6 @@ struct dmu_tx {
 	/* placeholder for syncing context, doesn't need specific holds */
 	boolean_t tx_anyobj;
 
-	/* has this transaction already been delayed? */
-	boolean_t tx_waited;
-
 	/* transaction is marked as being a "net free" of space */
 	boolean_t tx_netfree;
 
@@ -79,6 +76,9 @@ struct dmu_tx {
 	/* need to wait for sufficient dirty space */
 	boolean_t tx_wait_dirty;
 
+	/* has this transaction already been delayed? */
+	boolean_t tx_dirty_delayed;
+
 	int tx_err;
 };
 
@@ -97,8 +97,8 @@ typedef struct dmu_tx_hold {
 	dmu_tx_t *txh_tx;
 	list_node_t txh_node;
 	struct dnode *txh_dnode;
-	refcount_t txh_space_towrite;
-	refcount_t txh_memory_tohold;
+	zfs_refcount_t txh_space_towrite;
+	zfs_refcount_t txh_memory_tohold;
 	enum dmu_tx_hold_type txh_type;
 	uint64_t txh_arg1;
 	uint64_t txh_arg2;
@@ -138,7 +138,7 @@ extern dmu_tx_stats_t dmu_tx_stats;
  * These routines are defined in dmu.h, and are called by the user.
  */
 dmu_tx_t *dmu_tx_create(objset_t *dd);
-int dmu_tx_assign(dmu_tx_t *tx, txg_how_t txg_how);
+int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
 void dmu_tx_commit(dmu_tx_t *tx);
 void dmu_tx_abort(dmu_tx_t *tx);
 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);

include/sys/dnode.h

@@ -20,7 +20,7 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  */
 
@@ -260,13 +260,14 @@ struct dnode {
 	uint64_t dn_allocated_txg;
 	uint64_t dn_free_txg;
 	uint64_t dn_assigned_txg;
+	uint64_t dn_dirty_txg;			/* txg dnode was last dirtied */
 	kcondvar_t dn_notxholds;
 	enum dnode_dirtycontext dn_dirtyctx;
 	uint8_t *dn_dirtyctx_firstset;		/* dbg: contents meaningless */
 
 	/* protected by own devices */
-	refcount_t dn_tx_holds;
-	refcount_t dn_holds;
+	zfs_refcount_t dn_tx_holds;
+	zfs_refcount_t dn_holds;
 
 	kmutex_t dn_dbufs_mtx;
 	/*
@@ -338,7 +339,7 @@ int dnode_hold_impl(struct objset *dd, uint64_t object, int flag, int dn_slots,
     void *ref, dnode_t **dnp);
 boolean_t dnode_add_ref(dnode_t *dn, void *ref);
 void dnode_rele(dnode_t *dn, void *ref);
-void dnode_rele_and_unlock(dnode_t *dn, void *tag);
+void dnode_rele_and_unlock(dnode_t *dn, void *tag, boolean_t evicting);
 void dnode_setdirty(dnode_t *dn, dmu_tx_t *tx);
 void dnode_sync(dnode_t *dn, dmu_tx_t *tx);
 void dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs,
@@ -360,6 +361,10 @@ int dnode_next_offset(dnode_t *dn, int flags, uint64_t *off,
     int minlvl, uint64_t blkfill, uint64_t txg);
 void dnode_evict_dbufs(dnode_t *dn);
 void dnode_evict_bonus(dnode_t *dn);
+void dnode_free_interior_slots(dnode_t *dn);
+
+#define	DNODE_IS_DIRTY(_dn)						\
+	((_dn)->dn_dirty_txg >= spa_syncing_txg((_dn)->dn_objset->os_spa))
 
 #define	DNODE_IS_CACHEABLE(_dn)						\
 	((_dn)->dn_objset->os_primary_cache == ZFS_CACHE_ALL ||		\
@@ -453,6 +458,11 @@ typedef struct dnode_stats {
 	 * which had already been unlinked in an earlier txg.
 	 */
 	kstat_named_t dnode_hold_free_txg;
+	/*
+	 * Number of times dnode_free_interior_slots() needed to retry
+	 * acquiring a slot zrl lock due to contention.
+	 */
+	kstat_named_t dnode_free_interior_lock_retry;
 	/*
 	 * Number of new dnodes allocated by dnode_allocate().
 	 */

include/sys/dsl_dataset.h

@@ -186,7 +186,7 @@ typedef struct dsl_dataset {
 	 * Owning counts as a long hold.  See the comments above
 	 * dsl_pool_hold() for details.
 	 */
-	refcount_t ds_longholds;
+	zfs_refcount_t ds_longholds;
 
 	/* no locking; only for making guesses */
 	uint64_t ds_trysnap_txg;

include/sys/dsl_dir.h

@@ -103,7 +103,7 @@ struct dsl_dir {
 	/* Protected by dd_lock */
 	kmutex_t dd_lock;
 	list_t dd_props; /* list of dsl_prop_record_t's */
-	timestruc_t dd_snap_cmtime; /* last time snapshot namespace changed */
+	inode_timespec_t dd_snap_cmtime; /* last snapshot namespace change */
 	uint64_t dd_origin_txg;
 
 	/* gross estimate of space used by in-flight tx's */
@@ -159,7 +159,7 @@ boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
 void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
     uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
 void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
-timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
+inode_timespec_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
 void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
     dmu_tx_t *tx);
 void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx);

include/sys/fs/zfs.h

@@ -638,6 +638,7 @@ typedef struct zpool_rewind_policy {
 #define	ZPOOL_CONFIG_RESILVER_TXG	"resilver_txg"
 #define	ZPOOL_CONFIG_COMMENT		"comment"
 #define	ZPOOL_CONFIG_SUSPENDED		"suspended"	/* not stored on disk */
+#define	ZPOOL_CONFIG_SUSPENDED_REASON	"suspended_reason"	/* not stored */
 #define	ZPOOL_CONFIG_TIMESTAMP		"timestamp"	/* not stored on disk */
 #define	ZPOOL_CONFIG_BOOTFS		"bootfs"	/* not stored on disk */
 #define	ZPOOL_CONFIG_MISSING_DEVICES	"missing_vdevs"	/* not stored on disk */

include/sys/metaslab_impl.h

@@ -179,8 +179,7 @@ struct metaslab_class {
 	 * number of allocations allowed.
 	 */
 	uint64_t		mc_alloc_max_slots;
-	refcount_t		mc_alloc_slots;
-
+	zfs_refcount_t		mc_alloc_slots;
 	uint64_t		mc_alloc_groups; /* # of allocatable groups */
 
 	uint64_t		mc_alloc;	/* total allocated space */
@@ -230,7 +229,7 @@ struct metaslab_group {
 	 * are unable to handle their share of allocations.
 	 */
 	uint64_t		mg_max_alloc_queue_depth;
-	refcount_t		mg_alloc_queue_depth;
+	zfs_refcount_t		mg_alloc_queue_depth;
 
 	/*
 	 * A metalab group that can no longer allocate the minimum block

include/sys/mmp.h

@@ -43,6 +43,7 @@ typedef struct mmp_thread {
 	uberblock_t	mmp_ub;		/* last ub written by sync */
 	zio_t		*mmp_zio_root;	/* root of mmp write zios */
 	uint64_t	mmp_kstat_id;	/* unique id for next MMP write kstat */
+	int		mmp_skip_error; /* reason for last skipped write */
 } mmp_thread_t;
 
 

include/sys/refcount.h

@@ -41,17 +41,6 @@ extern "C" {
  */
 #define	FTAG ((char *)__func__)
 
-/*
- * Starting with 4.11, torvalds/linux@f405df5, the linux kernel defines a
- * refcount_t type of its own.  The macro below effectively changes references
- * in the ZFS code from refcount_t to zfs_refcount_t at compile time, so that
- * existing code need not be altered, reducing conflicts when landing openZFS
- * patches.
- */
-
-#define	refcount_t	zfs_refcount_t
-#define	refcount_add	zfs_refcount_add
-
 #ifdef	ZFS_DEBUG
 typedef struct reference {
 	list_node_t ref_link;
@@ -69,57 +58,60 @@ typedef struct refcount {
 	uint64_t rc_removed_count;
 } zfs_refcount_t;
 
-/* Note: refcount_t must be initialized with refcount_create[_untracked]() */
+/*
+ * Note: zfs_refcount_t must be initialized with
+ * refcount_create[_untracked]()
+ */
 
-void refcount_create(refcount_t *rc);
-void refcount_create_untracked(refcount_t *rc);
-void refcount_create_tracked(refcount_t *rc);
-void refcount_destroy(refcount_t *rc);
-void refcount_destroy_many(refcount_t *rc, uint64_t number);
-int refcount_is_zero(refcount_t *rc);
-int64_t refcount_count(refcount_t *rc);
-int64_t zfs_refcount_add(refcount_t *rc, void *holder_tag);
-int64_t refcount_remove(refcount_t *rc, void *holder_tag);
-int64_t refcount_add_many(refcount_t *rc, uint64_t number, void *holder_tag);
-int64_t refcount_remove_many(refcount_t *rc, uint64_t number, void *holder_tag);
-void refcount_transfer(refcount_t *dst, refcount_t *src);
-void refcount_transfer_ownership(refcount_t *, void *, void *);
-boolean_t refcount_held(refcount_t *, void *);
-boolean_t refcount_not_held(refcount_t *, void *);
+void zfs_refcount_create(zfs_refcount_t *);
+void zfs_refcount_create_untracked(zfs_refcount_t *);
+void zfs_refcount_create_tracked(zfs_refcount_t *);
+void zfs_refcount_destroy(zfs_refcount_t *);
+void zfs_refcount_destroy_many(zfs_refcount_t *, uint64_t);
+int zfs_refcount_is_zero(zfs_refcount_t *);
+int64_t zfs_refcount_count(zfs_refcount_t *);
+int64_t zfs_refcount_add(zfs_refcount_t *, void *);
+int64_t zfs_refcount_remove(zfs_refcount_t *, void *);
+int64_t zfs_refcount_add_many(zfs_refcount_t *, uint64_t, void *);
+int64_t zfs_refcount_remove_many(zfs_refcount_t *, uint64_t, void *);
+void zfs_refcount_transfer(zfs_refcount_t *, zfs_refcount_t *);
+void zfs_refcount_transfer_ownership(zfs_refcount_t *, void *, void *);
+boolean_t zfs_refcount_held(zfs_refcount_t *, void *);
+boolean_t zfs_refcount_not_held(zfs_refcount_t *, void *);
 
-void refcount_init(void);
-void refcount_fini(void);
+void zfs_refcount_init(void);
+void zfs_refcount_fini(void);
 
 #else	/* ZFS_DEBUG */
 
 typedef struct refcount {
 	uint64_t rc_count;
-} refcount_t;
+} zfs_refcount_t;
 
-#define	refcount_create(rc) ((rc)->rc_count = 0)
-#define	refcount_create_untracked(rc) ((rc)->rc_count = 0)
-#define	refcount_create_tracked(rc) ((rc)->rc_count = 0)
-#define	refcount_destroy(rc) ((rc)->rc_count = 0)
-#define	refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
-#define	refcount_is_zero(rc) ((rc)->rc_count == 0)
-#define	refcount_count(rc) ((rc)->rc_count)
+#define	zfs_refcount_create(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_create_untracked(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_create_tracked(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_destroy(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
+#define	zfs_refcount_is_zero(rc) ((rc)->rc_count == 0)
+#define	zfs_refcount_count(rc) ((rc)->rc_count)
 #define	zfs_refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
-#define	refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
-#define	refcount_add_many(rc, number, holder) \
+#define	zfs_refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
+#define	zfs_refcount_add_many(rc, number, holder) \
 	atomic_add_64_nv(&(rc)->rc_count, number)
-#define	refcount_remove_many(rc, number, holder) \
+#define	zfs_refcount_remove_many(rc, number, holder) \
 	atomic_add_64_nv(&(rc)->rc_count, -number)
-#define	refcount_transfer(dst, src) { \
+#define	zfs_refcount_transfer(dst, src) { \
 	uint64_t __tmp = (src)->rc_count; \
 	atomic_add_64(&(src)->rc_count, -__tmp); \
 	atomic_add_64(&(dst)->rc_count, __tmp); \
 }
-#define	refcount_transfer_ownership(rc, current_holder, new_holder)	(void)0
-#define	refcount_held(rc, holder)		((rc)->rc_count > 0)
-#define	refcount_not_held(rc, holder)		(B_TRUE)
+#define	zfs_refcount_transfer_ownership(rc, current_holder, new_holder)	(void)0
+#define	zfs_refcount_held(rc, holder)		((rc)->rc_count > 0)
+#define	zfs_refcount_not_held(rc, holder)		(B_TRUE)
 
-#define	refcount_init()
-#define	refcount_fini()
+#define	zfs_refcount_init()
+#define	zfs_refcount_fini()
 
 #endif	/* ZFS_DEBUG */
 

include/sys/rrwlock.h

@@ -57,8 +57,8 @@ typedef struct rrwlock {
 	kmutex_t	rr_lock;
 	kcondvar_t	rr_cv;
 	kthread_t	*rr_writer;
-	refcount_t	rr_anon_rcount;
-	refcount_t	rr_linked_rcount;
+	zfs_refcount_t	rr_anon_rcount;
+	zfs_refcount_t	rr_linked_rcount;
 	boolean_t	rr_writer_wanted;
 	boolean_t	rr_track_all;
 } rrwlock_t;

include/sys/sa_impl.h

@@ -110,7 +110,7 @@ typedef struct sa_idx_tab {
 	list_node_t	sa_next;
 	sa_lot_t	*sa_layout;
 	uint16_t	*sa_variable_lengths;
-	refcount_t	sa_refcount;
+	zfs_refcount_t	sa_refcount;
 	uint32_t	*sa_idx_tab;	/* array of offsets */
 } sa_idx_tab_t;
 

include/sys/spa.h

@@ -730,6 +730,7 @@ typedef struct spa_stats {
 	spa_stats_history_t	tx_assign_histogram;
 	spa_stats_history_t	io_history;
 	spa_stats_history_t	mmp_history;
+	spa_stats_history_t	state;		/* pool state */
 } spa_stats_t;
 
 typedef enum txg_state {
@@ -759,10 +760,12 @@ extern txg_stat_t *spa_txg_history_init_io(spa_t *, uint64_t,
     struct dsl_pool *);
 extern void spa_txg_history_fini_io(spa_t *, txg_stat_t *);
 extern void spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs);
+extern int spa_mmp_history_set_skip(spa_t *spa, uint64_t mmp_kstat_id);
 extern int spa_mmp_history_set(spa_t *spa, uint64_t mmp_kstat_id, int io_error,
     hrtime_t duration);
-extern void spa_mmp_history_add(uint64_t txg, uint64_t timestamp,
-    uint64_t mmp_delay, vdev_t *vd, int label, uint64_t mmp_kstat_id);
+extern void *spa_mmp_history_add(spa_t *spa, uint64_t txg, uint64_t timestamp,
+    uint64_t mmp_delay, vdev_t *vd, int label, uint64_t mmp_kstat_id,
+    int error);
 
 /* Pool configuration locks */
 extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);
@@ -887,6 +890,8 @@ extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
     dmu_tx_t *tx, const char *fmt, ...);
 
+extern const char *spa_state_to_name(spa_t *spa);
+
 /* error handling */
 struct zbookmark_phys;
 extern void spa_log_error(spa_t *spa, zio_t *zio);

include/sys/spa_impl.h

@@ -78,7 +78,7 @@ typedef struct spa_config_lock {
 	kthread_t	*scl_writer;
 	int		scl_write_wanted;
 	kcondvar_t	scl_cv;
-	refcount_t	scl_count;
+	zfs_refcount_t	scl_count;
 } spa_config_lock_t;
 
 typedef struct spa_config_dirent {
@@ -153,7 +153,7 @@ struct spa {
 	uint64_t	spa_freeze_txg;		/* freeze pool at this txg */
 	uint64_t	spa_load_max_txg;	/* best initial ub_txg */
 	uint64_t	spa_claim_max_txg;	/* highest claimed birth txg */
-	timespec_t	spa_loaded_ts;		/* 1st successful open time */
+	inode_timespec_t spa_loaded_ts;		/* 1st successful open time */
 	objset_t	*spa_meta_objset;	/* copy of dp->dp_meta_objset */
 	kmutex_t	spa_evicting_os_lock;	/* Evicting objset list lock */
 	list_t		spa_evicting_os_list;	/* Objsets being evicted. */
@@ -233,7 +233,7 @@ struct spa {
 	zio_t		*spa_suspend_zio_root;	/* root of all suspended I/O */
 	kmutex_t	spa_suspend_lock;	/* protects suspend_zio_root */
 	kcondvar_t	spa_suspend_cv;		/* notification of resume */
-	uint8_t		spa_suspended;		/* pool is suspended */
+	zio_suspend_reason_t	spa_suspended;	/* pool is suspended */
 	uint8_t		spa_claiming;		/* pool is doing zil_claim() */
 	boolean_t	spa_debug;		/* debug enabled? */
 	boolean_t	spa_is_root;		/* pool is root */
@@ -275,17 +275,18 @@ struct spa {
 	spa_stats_t	spa_stats;		/* assorted spa statistics */
 	hrtime_t	spa_ccw_fail_time;	/* Conf cache write fail time */
 	taskq_t		*spa_zvol_taskq;	/* Taskq for minor management */
+	taskq_t		*spa_prefetch_taskq;	/* Taskq for prefetch threads */
 	uint64_t	spa_multihost;		/* multihost aware (mmp) */
 	mmp_thread_t	spa_mmp;		/* multihost mmp thread */
 
 	/*
 	 * spa_refcount & spa_config_lock must be the last elements
-	 * because refcount_t changes size based on compilation options.
+	 * because zfs_refcount_t changes size based on compilation options.
 	 * In order for the MDB module to function correctly, the other
 	 * fields must remain in the same location.
 	 */
 	spa_config_lock_t spa_config_lock[SCL_LOCKS]; /* config changes */
-	refcount_t	spa_refcount;		/* number of opens */
+	zfs_refcount_t	spa_refcount;		/* number of opens */
 
 	taskq_t		*spa_upgrade_taskq;	/* taskq for upgrade jobs */
 };

include/sys/trace_dbuf.h

@@ -71,7 +71,7 @@
 		__entry->db_offset = db->db.db_offset;			\
 		__entry->db_size   = db->db.db_size;			\
 		__entry->db_state  = db->db_state;			\
-		__entry->db_holds  = refcount_count(&db->db_holds);	\
+		__entry->db_holds  = zfs_refcount_count(&db->db_holds);	\
 		snprintf(__get_str(msg), TRACE_DBUF_MSG_MAX,		\
 		    DBUF_TP_PRINTK_FMT, DBUF_TP_PRINTK_ARGS);		\
 	} else {							\

include/sys/trace_dmu.h

@@ -50,7 +50,7 @@ DECLARE_EVENT_CLASS(zfs_delay_mintime_class,
 	    __field(uint64_t,			tx_lastsnap_txg)
 	    __field(uint64_t,			tx_lasttried_txg)
 	    __field(boolean_t,			tx_anyobj)
-	    __field(boolean_t,			tx_waited)
+	    __field(boolean_t,			tx_dirty_delayed)
 	    __field(hrtime_t,			tx_start)
 	    __field(boolean_t,			tx_wait_dirty)
 	    __field(int,			tx_err)
@@ -62,7 +62,7 @@ DECLARE_EVENT_CLASS(zfs_delay_mintime_class,
 	    __entry->tx_lastsnap_txg		= tx->tx_lastsnap_txg;
 	    __entry->tx_lasttried_txg		= tx->tx_lasttried_txg;
 	    __entry->tx_anyobj			= tx->tx_anyobj;
-	    __entry->tx_waited			= tx->tx_waited;
+	    __entry->tx_dirty_delayed		= tx->tx_dirty_delayed;
 	    __entry->tx_start			= tx->tx_start;
 	    __entry->tx_wait_dirty		= tx->tx_wait_dirty;
 	    __entry->tx_err			= tx->tx_err;
@@ -70,11 +70,12 @@ DECLARE_EVENT_CLASS(zfs_delay_mintime_class,
 	    __entry->min_tx_time		= min_tx_time;
 	),
 	TP_printk("tx { txg %llu lastsnap_txg %llu tx_lasttried_txg %llu "
-	    "anyobj %d waited %d start %llu wait_dirty %d err %i "
+	    "anyobj %d dirty_delayed %d start %llu wait_dirty %d err %i "
 	    "} dirty %llu min_tx_time %llu",
 	    __entry->tx_txg, __entry->tx_lastsnap_txg,
-	    __entry->tx_lasttried_txg, __entry->tx_anyobj, __entry->tx_waited,
-	    __entry->tx_start, __entry->tx_wait_dirty, __entry->tx_err,
+	    __entry->tx_lasttried_txg, __entry->tx_anyobj,
+	    __entry->tx_dirty_delayed, __entry->tx_start,
+	    __entry->tx_wait_dirty, __entry->tx_err,
 	    __entry->dirty, __entry->min_tx_time)
 );
 /* END CSTYLED */

include/sys/uio_impl.h

@@ -42,7 +42,7 @@
 #include <sys/uio.h>
 
 extern int uiomove(void *, size_t, enum uio_rw, uio_t *);
-extern void uio_prefaultpages(ssize_t, uio_t *);
+extern int uio_prefaultpages(ssize_t, uio_t *);
 extern int uiocopy(void *, size_t, enum uio_rw, uio_t *, size_t *);
 extern void uioskip(uio_t *, size_t);
 

include/sys/xvattr.h

@@ -47,7 +47,7 @@
  * Structure of all optional attributes.
  */
 typedef struct xoptattr {
-	timestruc_t	xoa_createtime;	/* Create time of file */
+	inode_timespec_t xoa_createtime;	/* Create time of file */
 	uint8_t		xoa_archive;
 	uint8_t		xoa_system;
 	uint8_t		xoa_readonly;

include/sys/zap.h

@@ -226,7 +226,7 @@ int zap_lookup_norm_by_dnode(dnode_t *dn, const char *name,
     boolean_t *ncp);
 
 int zap_count_write_by_dnode(dnode_t *dn, const char *name,
-    int add, refcount_t *towrite, refcount_t *tooverwrite);
+    int add, zfs_refcount_t *towrite, zfs_refcount_t *tooverwrite);
 
 /*
  * Create an attribute with the given name and value.

include/sys/zfs_context.h

@@ -527,7 +527,7 @@ extern char *vn_dumpdir;
 #define	AV_SCANSTAMP_SZ	32		/* length of anti-virus scanstamp */
 
 typedef struct xoptattr {
-	timestruc_t	xoa_createtime;	/* Create time of file */
+	inode_timespec_t xoa_createtime;	/* Create time of file */
 	uint8_t		xoa_archive;
 	uint8_t		xoa_system;
 	uint8_t		xoa_readonly;
@@ -640,13 +640,6 @@ extern void delay(clock_t ticks);
 #define	USEC_TO_TICK(usec)	((usec) / (MICROSEC / hz))
 #define	NSEC_TO_TICK(usec)	((usec) / (NANOSEC / hz))
 
-#define	gethrestime_sec() time(NULL)
-#define	gethrestime(t) \
-	do {\
-		(t)->tv_sec = gethrestime_sec();\
-		(t)->tv_nsec = 0;\
-	} while (0);
-
 #define	max_ncpus	64
 #define	boot_ncpus	(sysconf(_SC_NPROCESSORS_ONLN))
 

include/sys/zfs_vfsops.h

@@ -32,6 +32,7 @@
 #include <sys/zil.h>
 #include <sys/sa.h>
 #include <sys/rrwlock.h>
+#include <sys/dsl_dataset.h>
 #include <sys/zfs_ioctl.h>
 
 #ifdef	__cplusplus

include/sys/zfs_vnops.h

@@ -54,7 +54,7 @@ extern int zfs_mkdir(struct inode *dip, char *dirname, vattr_t *vap,
     struct inode **ipp, cred_t *cr, int flags, vsecattr_t *vsecp);
 extern int zfs_rmdir(struct inode *dip, char *name, struct inode *cwd,
     cred_t *cr, int flags);
-extern int zfs_readdir(struct inode *ip, struct dir_context *ctx, cred_t *cr);
+extern int zfs_readdir(struct inode *ip, zpl_dir_context_t *ctx, cred_t *cr);
 extern int zfs_fsync(struct inode *ip, int syncflag, cred_t *cr);
 extern int zfs_getattr(struct inode *ip, vattr_t *vap, int flag, cred_t *cr);
 extern int zfs_getattr_fast(struct inode *ip, struct kstat *sp);

include/sys/zfs_znode.h

@@ -209,7 +209,7 @@ typedef struct znode_hold {
 	uint64_t	zh_obj;		/* object id */
 	kmutex_t	zh_lock;	/* lock serializing object access */
 	avl_node_t	zh_node;	/* avl tree linkage */
-	refcount_t	zh_refcount;	/* active consumer reference count */
+	zfs_refcount_t	zh_refcount;	/* active consumer reference count */
 } znode_hold_t;
 
 /*
@@ -270,19 +270,36 @@ typedef struct znode_hold {
 
 extern unsigned int zfs_object_mutex_size;
 
-/* Encode ZFS stored time values from a struct timespec */
+/*
+ * Encode ZFS stored time values from a struct timespec / struct timespec64.
+ */
 #define	ZFS_TIME_ENCODE(tp, stmp)		\
-{						\
+do {						\
 	(stmp)[0] = (uint64_t)(tp)->tv_sec;	\
 	(stmp)[1] = (uint64_t)(tp)->tv_nsec;	\
-}
+} while (0)
 
-/* Decode ZFS stored time values to a struct timespec */
+#if defined(HAVE_INODE_TIMESPEC64_TIMES)
+/*
+ * Decode ZFS stored time values to a struct timespec64
+ * 4.18 and newer kernels.
+ */
 #define	ZFS_TIME_DECODE(tp, stmp)		\
-{						\
+do {						\
+	(tp)->tv_sec = (time64_t)(stmp)[0];	\
+	(tp)->tv_nsec = (long)(stmp)[1];	\
+} while (0)
+#else
+/*
+ * Decode ZFS stored time values to a struct timespec
+ * 4.17 and older kernels.
+ */
+#define	ZFS_TIME_DECODE(tp, stmp)		\
+do {						\
 	(tp)->tv_sec = (time_t)(stmp)[0];	\
 	(tp)->tv_nsec = (long)(stmp)[1];	\
-}
+} while (0)
+#endif /* HAVE_INODE_TIMESPEC64_TIMES */
 
 /*
  * Timestamp defines

include/sys/zio.h

@@ -144,6 +144,12 @@ enum zio_checksum {
 #define	ZIO_FAILURE_MODE_CONTINUE	1
 #define	ZIO_FAILURE_MODE_PANIC		2
 
+typedef enum zio_suspend_reason {
+	ZIO_SUSPEND_NONE = 0,
+	ZIO_SUSPEND_IOERR,
+	ZIO_SUSPEND_MMP,
+} zio_suspend_reason_t;
+
 enum zio_flag {
 	/*
 	 * Flags inherited by gang, ddt, and vdev children,
@@ -369,7 +375,7 @@ typedef struct zio_transform {
 	struct zio_transform	*zt_next;
 } zio_transform_t;
 
-typedef int zio_pipe_stage_t(zio_t *zio);
+typedef zio_t *zio_pipe_stage_t(zio_t *zio);
 
 /*
  * The io_reexecute flags are distinct from io_flags because the child must
@@ -577,7 +583,7 @@ extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
 extern enum zio_compress zio_compress_select(spa_t *spa,
     enum zio_compress child, enum zio_compress parent);
 
-extern void zio_suspend(spa_t *spa, zio_t *zio);
+extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
 extern int zio_resume(spa_t *spa);
 extern void zio_resume_wait(spa_t *spa);
 

include/sys/zpl.h

@@ -125,56 +125,63 @@ extern const struct inode_operations zpl_ops_shares;
 
 #if defined(HAVE_VFS_ITERATE) || defined(HAVE_VFS_ITERATE_SHARED)
 
-#define	DIR_CONTEXT_INIT(_dirent, _actor, _pos) {	\
+#define	ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) {	\
 	.actor = _actor,				\
 	.pos = _pos,					\
 }
 
+typedef struct dir_context zpl_dir_context_t;
+
+#define	zpl_dir_emit		dir_emit
+#define	zpl_dir_emit_dot	dir_emit_dot
+#define	zpl_dir_emit_dotdot	dir_emit_dotdot
+#define	zpl_dir_emit_dots	dir_emit_dots
+
 #else
 
-typedef struct dir_context {
+typedef struct zpl_dir_context {
 	void *dirent;
 	const filldir_t actor;
 	loff_t pos;
-} dir_context_t;
+} zpl_dir_context_t;
 
-#define	DIR_CONTEXT_INIT(_dirent, _actor, _pos) {	\
+#define	ZPL_DIR_CONTEXT_INIT(_dirent, _actor, _pos) {	\
 	.dirent = _dirent,				\
 	.actor = _actor,				\
 	.pos = _pos,					\
 }
 
 static inline bool
-dir_emit(struct dir_context *ctx, const char *name, int namelen,
+zpl_dir_emit(zpl_dir_context_t *ctx, const char *name, int namelen,
     uint64_t ino, unsigned type)
 {
 	return (!ctx->actor(ctx->dirent, name, namelen, ctx->pos, ino, type));
 }
 
 static inline bool
-dir_emit_dot(struct file *file, struct dir_context *ctx)
+zpl_dir_emit_dot(struct file *file, zpl_dir_context_t *ctx)
 {
 	return (ctx->actor(ctx->dirent, ".", 1, ctx->pos,
 	    file_inode(file)->i_ino, DT_DIR) == 0);
 }
 
 static inline bool
-dir_emit_dotdot(struct file *file, struct dir_context *ctx)
+zpl_dir_emit_dotdot(struct file *file, zpl_dir_context_t *ctx)
 {
 	return (ctx->actor(ctx->dirent, "..", 2, ctx->pos,
 	    parent_ino(file_dentry(file)), DT_DIR) == 0);
 }
 
 static inline bool
-dir_emit_dots(struct file *file, struct dir_context *ctx)
+zpl_dir_emit_dots(struct file *file, zpl_dir_context_t *ctx)
 {
 	if (ctx->pos == 0) {
-		if (!dir_emit_dot(file, ctx))
+		if (!zpl_dir_emit_dot(file, ctx))
 			return (false);
 		ctx->pos = 1;
 	}
 	if (ctx->pos == 1) {
-		if (!dir_emit_dotdot(file, ctx))
+		if (!zpl_dir_emit_dotdot(file, ctx))
 			return (false);
 		ctx->pos = 2;
 	}
@@ -182,4 +189,13 @@ dir_emit_dots(struct file *file, struct dir_context *ctx)
 }
 #endif /* HAVE_VFS_ITERATE */
 
+/*
+ * Linux 4.18, inode times converted from timespec to timespec64.
+ */
+#if defined(HAVE_INODE_TIMESPEC64_TIMES)
+#define	zpl_inode_timespec_trunc(ts, gran)	timespec64_trunc(ts, gran)
+#else
+#define	zpl_inode_timespec_trunc(ts, gran)	timespec_trunc(ts, gran)
+#endif
+
 #endif	/* _SYS_ZPL_H */

lib/libefi/rdwr_efi.c

@@ -300,6 +300,20 @@ efi_get_info(int fd, struct dk_cinfo *dki_info)
 		rval = sscanf(dev_path, "/dev/loop%[0-9]p%hu",
 		    dki_info->dki_dname + 4,
 		    &dki_info->dki_partition);
+	} else if ((strncmp(dev_path, "/dev/nvme", 9) == 0)) {
+		strcpy(dki_info->dki_cname, "nvme");
+		dki_info->dki_ctype = DKC_SCSI_CCS;
+		strcpy(dki_info->dki_dname, "nvme");
+		(void) sscanf(dev_path, "/dev/nvme%[0-9]",
+		    dki_info->dki_dname + 4);
+		size_t controller_length = strlen(
+		    dki_info->dki_dname);
+		strcpy(dki_info->dki_dname + controller_length,
+		    "n");
+		rval = sscanf(dev_path,
+		    "/dev/nvme%*[0-9]n%[0-9]p%hu",
+		    dki_info->dki_dname + controller_length + 1,
+		    &dki_info->dki_partition);
 	} else {
 		strcpy(dki_info->dki_dname, "unknown");
 		strcpy(dki_info->dki_cname, "unknown");

lib/libshare/smb.c

@@ -218,7 +218,7 @@ smb_enable_share_one(const char *sharename, const char *sharepath)
 	int rc;
 
 	/* Support ZFS share name regexp '[[:alnum:]_-.: ]' */
-	strncpy(name, sharename, sizeof (name));
+	strlcpy(name, sharename, sizeof (name));
 	name [sizeof (name)-1] = '\0';
 
 	pos = name;

lib/libspl/Makefile.am

@@ -19,8 +19,6 @@ noinst_LTLIBRARIES = libspl.la
 
 USER_C = \
 	getexecname.c \
-	gethrtime.c \
-	gethrestime.c \
 	getmntany.c \
 	list.c \
 	mkdirp.c \

lib/libspl/gethrestime.c

@@ -1,38 +0,0 @@
-/*
- * 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
- */
-
-/*
- * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#include <time.h>
-#include <sys/time.h>
-
-void
-gethrestime(timestruc_t *ts)
-{
-	struct timeval tv;
-
-	gettimeofday(&tv, NULL);
-	ts->tv_sec = tv.tv_sec;
-	ts->tv_nsec = tv.tv_usec * NSEC_PER_USEC;
-}

lib/libspl/gethrtime.c

@@ -1,45 +0,0 @@
-/*
- * 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
- */
-
-/*
- * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#include <time.h>
-#include <sys/time.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-hrtime_t
-gethrtime(void)
-{
-	struct timespec ts;
-	int rc;
-
-	rc = clock_gettime(CLOCK_MONOTONIC, &ts);
-	if (rc) {
-		fprintf(stderr, "Error: clock_gettime() = %d\n", rc);
-		abort();
-	}
-
-	return ((((u_int64_t)ts.tv_sec) * NANOSEC) + ts.tv_nsec);
-}

lib/libspl/include/sys/isa_defs.h

@@ -55,6 +55,7 @@ extern "C" {
 #endif
 
 #define	_SUNOS_VTOC_16
+#define	HAVE_EFFICIENT_UNALIGNED_ACCESS
 
 /* i386 arch specific defines */
 #elif defined(__i386) || defined(__i386__)
@@ -76,6 +77,7 @@ extern "C" {
 #endif
 
 #define	_SUNOS_VTOC_16
+#define	HAVE_EFFICIENT_UNALIGNED_ACCESS
 
 /* powerpc arch specific defines */
 #elif defined(__powerpc) || defined(__powerpc__) || defined(__powerpc64__)
@@ -99,6 +101,7 @@ extern "C" {
 #endif
 
 #define	_SUNOS_VTOC_16
+#define	HAVE_EFFICIENT_UNALIGNED_ACCESS
 
 /* arm arch specific defines */
 #elif defined(__arm) || defined(__arm__) || defined(__aarch64__)
@@ -129,6 +132,10 @@ extern "C" {
 
 #define	_SUNOS_VTOC_16
 
+#if defined(__ARM_FEATURE_UNALIGNED)
+#define	HAVE_EFFICIENT_UNALIGNED_ACCESS
+#endif
+
 /* sparc arch specific defines */
 #elif defined(__sparc) || defined(__sparc__)
 

lib/libspl/include/sys/kstat.h

@@ -304,6 +304,8 @@ typedef struct kstat32 {
 #define	KSTAT_FLAG_PERSISTENT		0x08
 #define	KSTAT_FLAG_DORMANT		0x10
 #define	KSTAT_FLAG_INVALID		0x20
+#define	KSTAT_FLAG_LONGSTRINGS		0x40
+#define	KSTAT_FLAG_NO_HEADERS		0x80
 
 /*
  * Dynamic update support

lib/libspl/include/sys/time.h

@@ -27,8 +27,9 @@
 #ifndef _LIBSPL_SYS_TIME_H
 #define	_LIBSPL_SYS_TIME_H
 
-#include_next <sys/time.h>
+#include <time.h>
 #include <sys/types.h>
+#include_next <sys/time.h>
 
 #ifndef SEC
 #define	SEC		1
@@ -70,13 +71,33 @@
 #define	SEC2NSEC(m)	((hrtime_t)(m) * (NANOSEC / SEC))
 #endif
 
-
 typedef	long long		hrtime_t;
-typedef	struct	timespec	timestruc_t;
 typedef	struct timespec		timespec_t;
+typedef struct timespec		inode_timespec_t;
 
+static inline void
+gethrestime(inode_timespec_t *ts)
+{
+	struct timeval tv;
+	(void) gettimeofday(&tv, NULL);
+	ts->tv_sec = tv.tv_sec;
+	ts->tv_nsec = tv.tv_usec * NSEC_PER_USEC;
+}
 
-extern hrtime_t gethrtime(void);
-extern void gethrestime(timestruc_t *);
+static inline time_t
+gethrestime_sec(void)
+{
+	struct timeval tv;
+	(void) gettimeofday(&tv, NULL);
+	return (tv.tv_sec);
+}
+
+static inline hrtime_t
+gethrtime(void)
+{
+	struct timespec ts;
+	(void) clock_gettime(CLOCK_MONOTONIC, &ts);
+	return ((((u_int64_t)ts.tv_sec) * NANOSEC) + ts.tv_nsec);
+}
 
 #endif /* _LIBSPL_SYS_TIME_H */