Tag zfs-2.0.7

META file and changelog updated.

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

.github/ISSUE_TEMPLATE/bug_report.md

@@ -25,14 +25,16 @@ Type | Version/Name
  --- | ---
 Distribution Name	|
 Distribution Version	|
-Linux Kernel	|
+Kernel Version	|
 Architecture	|
-ZFS Version	|
+OpenZFS Version	|
-SPL Version	|
 <!--
-Commands to find ZFS/SPL versions:
+Command to find OpenZFS version:
-modinfo zfs | grep -iw version
+zfs version
-modinfo spl | grep -iw version
+
+Commands to find kernel version:
+uname -r		# Linux
+freebsd-version -r	# FreeBSD
 -->
 
 ### Describe the problem you're observing

.github/ISSUE_TEMPLATE/config.yml

@@ -7,5 +7,5 @@ contact_links:
     url: https://lists.freebsd.org/mailman/listinfo/freebsd-fs
     about: Get community support for OpenZFS on FreeBSD
   - name: OpenZFS on IRC
-    url: https://webchat.freenode.net/#openzfs
+    url: https://web.libera.chat/#openzfs
     about: Use IRC to get community support for OpenZFS

.github/workflows/checkstyle.yaml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   checkstyle:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v2
       with:
@@ -18,12 +18,13 @@ jobs:
         sudo apt-get install --yes -qq zlib1g-dev uuid-dev libattr1-dev libblkid-dev libselinux-dev libudev-dev libssl-dev python-dev python-setuptools python-cffi python3 python3-dev python3-setuptools python3-cffi
         # packages for tests
         sudo apt-get install --yes -qq parted lsscsi ksh attr acl nfs-kernel-server fio
-        sudo apt-get install --yes -qq mandoc cppcheck pax-utils abigail-tools # devscripts - enable then bashisms fixed
+        sudo apt-get install --yes -qq mandoc cppcheck pax-utils devscripts
         sudo -E pip --quiet install flake8
     - name: Prepare
       run: |
         sh ./autogen.sh
         ./configure
+        make -j$(nproc)
     - name: Checkstyle
       run: |
         make checkstyle
@@ -31,6 +32,19 @@ jobs:
       run: |
         make lint
     - name: CheckABI
+      id: CheckABI
       run: |
-        make -j$(nproc)
+        sudo docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make checkabi
-        make checkabi
+    - name: StoreABI
+      if: failure() && steps.CheckABI.outcome == 'failure'
+      run: |
+        sudo docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make storeabi
+    - name: Prepare artifacts
+      if: failure() && steps.CheckABI.outcome == 'failure'
+      run: |
+        find -name *.abi | tar -cf abi_files.tar -T -
+    - uses: actions/upload-artifact@v2
+      if: failure() && steps.CheckABI.outcome == 'failure'
+      with:
+        name: New ABI files (use only if you're sure about interface changes)
+        path: abi_files.tar

.github/workflows/zfs-tests-functional.yml

@@ -0,0 +1,81 @@
+name: zfs-tests-functional
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  tests-functional-ubuntu:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [18.04, 20.04]
+    runs-on: ubuntu-${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install --yes -qq build-essential autoconf libtool gdb lcov \
+          git alien fakeroot wget curl bc fio acl \
+          sysstat mdadm lsscsi parted gdebi attr dbench watchdog ksh \
+          nfs-kernel-server samba rng-tools xz-utils \
+          zlib1g-dev uuid-dev libblkid-dev libselinux-dev \
+          xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
+          libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
+          libpam0g-dev pamtester python-dev python-setuptools python-cffi \
+          python3 python3-dev python3-setuptools python3-cffi python3-packaging
+    - name: Autogen.sh
+      run: |
+        sh autogen.sh
+    - name: Configure
+      run: |
+        ./configure --enable-debug --enable-debuginfo
+    - name: Make
+      run: |
+        make --no-print-directory -s pkg-utils pkg-kmod
+    - name: Install
+      run: |
+        sudo dpkg -i *.deb
+        # Update order of directories to search for modules, otherwise
+        #   Ubuntu will load kernel-shipped ones.
+        sudo sed -i.bak 's/updates/extra updates/' /etc/depmod.d/ubuntu.conf
+        sudo depmod
+        sudo modprobe zfs
+        # Workaround for cloud-init bug
+        # see https://github.com/openzfs/zfs/issues/12644
+        FILE=/lib/udev/rules.d/10-cloud-init-hook-hotplug.rules
+        if [ -r "${FILE}" ]; then
+          HASH=$(md5sum "${FILE}" | awk '{ print $1 }')
+          if [ "${HASH}" = "121ff0ef1936cd2ef65aec0458a35772" ]; then
+            # Just shove a zd* exclusion right above the hotplug hook...
+            sudo sed -i -e s/'LABEL="cloudinit_hook"'/'KERNEL=="zd*", GOTO="cloudinit_end"\n&'/ "${FILE}"
+            sudo udevadm control --reload-rules
+          fi
+        fi
+        # Workaround to provide additional free space for testing.
+        #   https://github.com/actions/virtual-environments/issues/2840
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /opt/ghc
+        sudo rm -rf "/usr/local/share/boost"
+        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+    - name: Tests
+      run: |
+        /usr/share/zfs/zfs-tests.sh -vR -s 3G
+    - name: Prepare artifacts
+      if: failure()
+      run: |
+        RESULTS_PATH=$(readlink -f /var/tmp/test_results/current)
+        sudo dmesg > $RESULTS_PATH/dmesg
+        sudo cp /var/log/syslog $RESULTS_PATH/
+        sudo chmod +r $RESULTS_PATH/*
+        # Replace ':' in dir names, actions/upload-artifact doesn't support it
+        for f in $(find /var/tmp/test_results -name '*:*'); do mv "$f" "${f//:/__}"; done
+    - uses: actions/upload-artifact@v2
+      if: failure()
+      with:
+        name: Test logs Ubuntu-${{ matrix.os }}
+        path: /var/tmp/test_results/20*/
+        if-no-files-found: ignore

.github/workflows/zfs-tests-sanity.yml

@@ -22,7 +22,7 @@ jobs:
           xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
           libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
           libpam0g-dev pamtester python-dev python-setuptools python-cffi \
-          python3 python3-dev python3-setuptools python3-cffi
+          python3 python3-dev python3-setuptools python3-cffi python3-packaging
     - name: Autogen.sh
       run: |
         sh autogen.sh
@@ -40,9 +40,26 @@ jobs:
         sudo sed -i.bak 's/updates/extra updates/' /etc/depmod.d/ubuntu.conf
         sudo depmod
         sudo modprobe zfs
+        # Workaround for cloud-init bug
+        # see https://github.com/openzfs/zfs/issues/12644
+        FILE=/lib/udev/rules.d/10-cloud-init-hook-hotplug.rules
+        if [ -r "${FILE}" ]; then
+          HASH=$(md5sum "${FILE}" | awk '{ print $1 }')
+          if [ "${HASH}" = "121ff0ef1936cd2ef65aec0458a35772" ]; then
+            # Just shove a zd* exclusion right above the hotplug hook...
+            sudo sed -i -e s/'LABEL="cloudinit_hook"'/'KERNEL=="zd*", GOTO="cloudinit_end"\n&'/ "${FILE}"
+            sudo udevadm control --reload-rules
+          fi
+        fi
+        # Workaround to provide additional free space for testing.
+        #   https://github.com/actions/virtual-environments/issues/2840
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /opt/ghc
+        sudo rm -rf "/usr/local/share/boost"
+        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
     - name: Tests
       run: |
-        /usr/share/zfs/zfs-tests.sh -v -s 3G -r sanity
+        /usr/share/zfs/zfs-tests.sh -vR -s 3G -r sanity
     - name: Prepare artifacts
       if: failure()
       run: |
@@ -50,6 +67,8 @@ jobs:
         sudo dmesg > $RESULTS_PATH/dmesg
         sudo cp /var/log/syslog $RESULTS_PATH/
         sudo chmod +r $RESULTS_PATH/*
+        # Replace ':' in dir names, actions/upload-artifact doesn't support it
+        for f in $(find /var/tmp/test_results -name '*:*'); do mv "$f" "${f//:/__}"; done
     - uses: actions/upload-artifact@v2
       if: failure()
       with:

.github/workflows/zloop.yml

@@ -22,8 +22,8 @@ jobs:
           xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
           libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
           libpam0g-dev \
-          python-dev python-setuptools python-cffi \
+          python-dev python-setuptools python-cffi python-packaging \
-          python3 python3-dev python3-setuptools python3-cffi
+          python3 python3-dev python3-setuptools python3-cffi python3-packaging
     - name: Autogen.sh
       run: |
         sh autogen.sh

META

@@ -1,10 +1,10 @@
 Meta:          1
 Name:          zfs
 Branch:        1.0
-Version:       2.0.2
+Version:       2.0.7
 Release:       1
 Release-Tags:  relext
 License:       CDDL
 Author:        OpenZFS
-Linux-Maximum: 5.10
+Linux-Maximum: 5.15
 Linux-Minimum: 3.10

Makefile.am

@@ -25,7 +25,6 @@ endif
 
 AUTOMAKE_OPTIONS = foreign
 EXTRA_DIST  = autogen.sh copy-builtin
-EXTRA_DIST += cppcheck-suppressions.txt
 EXTRA_DIST += config/config.awk config/rpm.am config/deb.am config/tgz.am
 EXTRA_DIST += META AUTHORS COPYRIGHT LICENSE NEWS NOTICE README.md
 EXTRA_DIST += CODE_OF_CONDUCT.md
@@ -162,7 +161,7 @@ checkbashisms:
 				-o -name '90zfs' -prune \
 				-o -type f ! -name 'config*' \
 				! -name 'libtool' \
-			-exec sh -c 'awk "NR==1 && /\#\!.*bin\/sh.*/ {print FILENAME;}" "{}"' \;); \
+			-exec sh -c 'awk "NR==1 && /#!.*bin\/sh.*/ {print FILENAME;}" "{}"' \;); \
 	else \
 		echo "skipping checkbashisms because checkbashisms is not installed"; \
 	fi
@@ -204,13 +203,13 @@ vcscheck:
 PHONY += lint
 lint: cppcheck paxcheck
 
+CPPCHECKDIRS = cmd lib module
 PHONY += cppcheck
-cppcheck:
+cppcheck: $(CPPCHECKDIRS)
-	@if type cppcheck > /dev/null 2>&1; then \
+	@if test -n "$(CPPCHECK)"; then \
-		cppcheck --quiet --force --error-exitcode=2 --inline-suppr \
+		set -e ; for dir in $(CPPCHECKDIRS) ; do \
-			--suppressions-list=${top_srcdir}/cppcheck-suppressions.txt \
+			$(MAKE) -C $$dir cppcheck ; \
-			-UHAVE_SSE2 -UHAVE_AVX512F -UHAVE_UIO_ZEROCOPY \
+		done \
-			${top_srcdir}; \
 	else \
 		echo "skipping cppcheck because cppcheck is not installed"; \
 	fi

cmd/Makefile.am

@@ -1,10 +1,20 @@
 SUBDIRS  = zfs zpool zdb zhack zinject zstream zstreamdump ztest
 SUBDIRS += fsck_zfs vdev_id raidz_test zfs_ids_to_path
 
+CPPCHECKDIRS  = zfs zpool zdb zhack zinject zstream ztest
+CPPCHECKDIRS += raidz_test zfs_ids_to_path
+
 if USING_PYTHON
 SUBDIRS += arcstat arc_summary dbufstat
 endif
 
 if BUILD_LINUX
 SUBDIRS += mount_zfs zed zgenhostid zvol_id zvol_wait
+CPPCHECKDIRS += mount_zfs zed zgenhostid zvol_id
 endif
+
+PHONY = cppcheck
+cppcheck: $(CPPCHECKDIRS)
+	set -e ; for dir in $(CPPCHECKDIRS) ; do \
+		$(MAKE) -C $$dir cppcheck ; \
+	done

cmd/arc_summary/arc_summary3

@@ -58,7 +58,6 @@ SECTION_PATHS = {'arc': 'arcstats',
                  'dmu': 'dmu_tx',
                  'l2arc': 'arcstats',  # L2ARC stuff lives in arcstats
                  'vdev': 'vdev_cache_stats',
-                 'xuio': 'xuio_stats',
                  'zfetch': 'zfetchstats',
                  'zil': 'zil'}
 

cmd/mount_zfs/Makefile.am

@@ -18,3 +18,5 @@ mount_zfs_LDADD = \
 	$(abs_top_builddir)/lib/libnvpair/libnvpair.la
 
 mount_zfs_LDADD += $(LTLIBINTL)
+
+include $(top_srcdir)/config/CppCheck.am

cmd/mount_zfs/mount_zfs.c

@@ -367,7 +367,7 @@ main(int argc, char **argv)
 				    "mount the filesystem again.\n"), dataset);
 				return (MOUNT_SYSERR);
 			}
-			/* fallthru */
+			fallthrough;
 #endif
 		default:
 			(void) fprintf(stderr, gettext("filesystem "

cmd/raidz_test/Makefile.am

@@ -18,3 +18,5 @@ raidz_test_LDADD = \
 	$(abs_top_builddir)/lib/libzfs_core/libzfs_core.la
 
 raidz_test_LDADD += -lm
+
+include $(top_srcdir)/config/CppCheck.am

cmd/vdev_id/vdev_id

@@ -79,6 +79,34 @@
 # channel 86:00.0 1         A
 # channel 86:00.0 0         B
 
+# #
+# # Example vdev_id.conf - multipath / multijbod-daisychaining
+# #
+#
+# multipath yes
+# multijbod yes
+#
+# #       PCI_ID  HBA PORT  CHANNEL NAME
+# channel 85:00.0 1         A
+# channel 85:00.0 0         B
+# channel 86:00.0 1         A
+# channel 86:00.0 0         B
+
+# #
+# # Example vdev_id.conf - multipath / mixed
+# #
+#
+# multipath yes
+# slot mix
+#
+# #       PCI_ID  HBA PORT  CHANNEL NAME
+# channel 85:00.0 3         A
+# channel 85:00.0 2         B
+# channel 86:00.0 3         A
+# channel 86:00.0 2         B
+# channel af:00.0 0         C
+# channel af:00.0 1         C
+
 # #
 # # Example vdev_id.conf - alias
 # #
@@ -92,9 +120,10 @@ PATH=/bin:/sbin:/usr/bin:/usr/sbin
 CONFIG=/etc/zfs/vdev_id.conf
 PHYS_PER_PORT=
 DEV=
-MULTIPATH=
 TOPOLOGY=
 BAY=
+ENCL_ID=""
+UNIQ_ENCL_ID=""
 
 usage() {
 	cat << EOF
@@ -107,22 +136,25 @@ Usage: vdev_id [-h]
   -e    Create enclose device symlinks only (/dev/by-enclosure)
   -g    Storage network topology [default="$TOPOLOGY"]
   -m    Run in multipath mode
+  -j    Run in multijbod mode
   -p    number of phy's per switch port [default=$PHYS_PER_PORT]
   -h    show this summary
 EOF
-	exit 0
+	exit 1
+	# exit with error to avoid processing usage message by a udev rule
 }
 
 map_slot() {
 	LINUX_SLOT=$1
 	CHANNEL=$2
 
-	MAPPED_SLOT=`awk "\\$1 == \"slot\" && \\$2 == ${LINUX_SLOT} && \
+	MAPPED_SLOT=$(awk -v linux_slot="$LINUX_SLOT" -v channel="$CHANNEL" \
-			\\$4 ~ /^${CHANNEL}$|^$/ { print \\$3; exit }" $CONFIG`
+			'$1 == "slot" && $2 == linux_slot && \
+			($4 ~ "^"channel"$" || $4 ~ /^$/) { print $3; exit}' $CONFIG)
 	if [ -z "$MAPPED_SLOT" ] ; then
 		MAPPED_SLOT=$LINUX_SLOT
 	fi
-	printf "%d" ${MAPPED_SLOT}
+	printf "%d" "${MAPPED_SLOT}"
 }
 
 map_channel() {
@@ -132,40 +164,120 @@ map_channel() {
 
 	case $TOPOLOGY in
 		"sas_switch")
-		MAPPED_CHAN=`awk "\\$1 == \"channel\" && \\$2 == ${PORT} \
+		MAPPED_CHAN=$(awk -v port="$PORT" \
-			{ print \\$3; exit }" $CONFIG`
+			'$1 == "channel" && $2 == port \
+			{ print $3; exit }' $CONFIG)
 		;;
 		"sas_direct"|"scsi")
-		MAPPED_CHAN=`awk "\\$1 == \"channel\" && \
+		MAPPED_CHAN=$(awk -v pciID="$PCI_ID" -v port="$PORT" \
-			\\$2 == \"${PCI_ID}\" && \\$3 == ${PORT} \
+			'$1 == "channel" && $2 == pciID && $3 == port \
-			{ print \\$4; exit }" $CONFIG`
+			{print $4}' $CONFIG)
 		;;
 	esac
-	printf "%s" ${MAPPED_CHAN}
+	printf "%s" "${MAPPED_CHAN}"
+}
+
+get_encl_id() {
+	set -- $(echo $1)
+	count=$#
+
+	i=1
+	while [ $i -le $count ] ; do
+		d=$(eval echo '$'{$i})
+		id=$(cat "/sys/class/enclosure/${d}/id")
+		ENCL_ID="${ENCL_ID} $id"
+		i=$((i + 1))
+	done
+}
+
+get_uniq_encl_id() {
+	for uuid in ${ENCL_ID}; do
+		found=0
+
+		for count in ${UNIQ_ENCL_ID}; do
+			if [ $count = $uuid ]; then
+				found=1
+				break
+			fi
+		done
+
+		if [ $found -eq 0 ]; then
+			UNIQ_ENCL_ID="${UNIQ_ENCL_ID} $uuid"
+		fi
+	done
+}
+
+# map_jbod explainer: The bsg driver knows the difference between a SAS
+# expander and fanout expander. Use hostX instance along with top-level
+# (whole enclosure) expander instances in /sys/class/enclosure and
+# matching a field in an array of expanders, using the index of the
+# matched array field as the enclosure instance, thereby making jbod IDs
+# dynamic. Avoids reliance on high overhead userspace commands like
+# multipath and lsscsi and instead uses existing sysfs data.  $HOSTCHAN
+# variable derived from devpath gymnastics in sas_handler() function.
+map_jbod() {
+	DEVEXP=$(ls -l "/sys/block/$DEV/device/" | grep enclos | awk -F/ '{print $(NF-1) }')
+	DEV=$1
+
+	# Use "set --" to create index values (Arrays)
+	set -- $(ls -l /sys/class/enclosure | grep -v "^total" | awk '{print $9}')
+	# Get count of total elements
+	JBOD_COUNT=$#
+	JBOD_ITEM=$*
+
+	# Build JBODs (enclosure)  id from sys/class/enclosure/<dev>/id
+	get_encl_id "$JBOD_ITEM"
+	# Different expander instances for each paths.
+	# Filter out and keep only unique id.
+	get_uniq_encl_id
+
+	# Identify final 'mapped jbod'
+	j=0
+	for count in ${UNIQ_ENCL_ID}; do
+		i=1
+		j=$((j + 1))
+		while [ $i -le $JBOD_COUNT ] ; do
+			d=$(eval echo '$'{$i})
+			id=$(cat "/sys/class/enclosure/${d}/id")
+			if [ "$d" = "$DEVEXP" ] && [ $id = $count ] ; then
+				MAPPED_JBOD=$j
+				break
+			fi
+			i=$((i + 1))
+		done
+	done
+
+	printf "%d" "${MAPPED_JBOD}"
 }
 
 sas_handler() {
 	if [ -z "$PHYS_PER_PORT" ] ; then
-		PHYS_PER_PORT=`awk "\\$1 == \"phys_per_port\" \
+		PHYS_PER_PORT=$(awk '$1 == "phys_per_port" \
-			{print \\$2; exit}" $CONFIG`
+			{print $2; exit}' $CONFIG)
 	fi
 	PHYS_PER_PORT=${PHYS_PER_PORT:-4}
-	if ! echo $PHYS_PER_PORT | grep -q -E '^[0-9]+$' ; then
+
+	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\" \
+		MULTIPATH_MODE=$(awk '$1 == "multipath" \
-			{print \\$2; exit}" $CONFIG`
+			{print $2; exit}' $CONFIG)
+	fi
+
+	if [ -z "$MULTIJBOD_MODE" ] ; then
+		MULTIJBOD_MODE=$(awk '$1 == "multijbod" \
+			{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 |
+			DM_NAME=$(ls -l --full-time /dev/mapper |
-				awk "/\/$DEV$/{print \\$9}"`
+				grep "$DEV"$ | awk '{print $9}')
 		fi
 
 		# For raw disks udev exports DEVTYPE=partition when
@@ -175,28 +287,50 @@ sas_handler() {
 		# we have to append the -part suffix directly in the
 		# helper.
 		if [ "$DEVTYPE" != "partition" ] ; then
-			PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
+			# Match p[number], remove the 'p' and prepend "-part"
+			PART=$(echo "$DM_NAME" |
+				awk 'match($0,/p[0-9]+$/) {print "-part"substr($0,RSTART+1,RLENGTH-1)}')
 		fi
 
 		# Strip off partition information.
-		DM_NAME=`echo $DM_NAME | sed 's/p[0-9][0-9]*$//'`
+		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
+		# Utilize DM device name to gather subordinate block devices
-		# leading pipe symbols to make field numbering consistent.
+		# using sysfs to avoid userspace utilities
-		DEV=`multipath -ll $DM_NAME |
+
-			awk '/running/{gsub("^[|]"," "); print $3 ; exit}'`
+		# If our DEVNAME is something like /dev/dm-177, then we may be
+		# able to get our DMDEV from it.
+		DMDEV=$(echo $DEVNAME | sed 's;/dev/;;g')
+		if [ ! -e /sys/block/$DMDEV/slaves/* ] ; then
+			# It's not there, try looking in /dev/mapper
+			DMDEV=$(ls -l --full-time /dev/mapper | grep $DM_NAME |
+			awk '{gsub("../", " "); print $NF}')
+		fi
+
+		# Use sysfs pointers in /sys/block/dm-X/slaves because using
+		# userspace tools creates lots of overhead and should be avoided
+		# whenever possible. Use awk to isolate lowest instance of
+		# sd device member in dm device group regardless of string
+		# length.
+		DEV=$(ls "/sys/block/$DMDEV/slaves" | awk '
+			{ len=sprintf ("%20s",length($0)); gsub(/ /,0,str); a[NR]=len "_" $0; }
+			END {
+				asort(a)
+				print substr(a[1],22)
+			}')
+
 		if [ -z "$DEV" ] ; then
 			return
 		fi
 	fi
 
-	if echo $DEV | grep -q ^/devices/ ; then
+	if echo "$DEV" | grep -q ^/devices/ ; then
 		sys_path=$DEV
 	else
-		sys_path=`udevadm info -q path -p /sys/block/$DEV 2>/dev/null`
+		sys_path=$(udevadm info -q path -p "/sys/block/$DEV" 2>/dev/null)
 	fi
 
 	# Use positional parameters as an ad-hoc array
@@ -206,84 +340,104 @@ sas_handler() {
 
 	# Get path up to /sys/.../hostX
 	i=1
-	while [ $i -le $num_dirs ] ; do
+
-		d=$(eval echo \${$i})
+	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
+		echo "$d" | grep -q -E '^host[0-9]+$' && break
-		i=$(($i + 1))
+		i=$((i + 1))
 	done
 
-	if [ $i = $num_dirs ] ; then
+	# Lets grab the SAS host channel number and save it for JBOD sorting later
+	HOSTCHAN=$(echo "$d" | awk -F/ '{ gsub("host","",$NF); print $NF}')
+
+	if [ $i = "$num_dirs" ] ; then
 		return
 	fi
 
-	PCI_ID=$(eval echo \${$(($i -1))} | awk -F: '{print $2":"$3}')
+	PCI_ID=$(eval echo '$'{$((i -1))} | awk -F: '{print $2":"$3}')
 
 	# In sas_switch mode, the directory four levels beneath
 	# /sys/.../hostX contains symlinks to phy devices that reveal
 	# the switch port number.  In sas_direct mode, the phy links one
 	# directory down reveal the HBA port.
 	port_dir=$scsi_host_dir
+
 	case $TOPOLOGY in
-		"sas_switch") j=$(($i + 4)) ;;
+		"sas_switch") j=$((i + 4)) ;;
-		"sas_direct") j=$(($i + 1)) ;;
+		"sas_direct") j=$((i + 1)) ;;
 	esac
 
-	i=$(($i + 1))
+	i=$((i + 1))
+
 	while [ $i -le $j ] ; do
-		port_dir="$port_dir/$(eval echo \${$i})"
+		port_dir="$port_dir/$(eval echo '$'{$i})"
-		i=$(($i + 1))
+		i=$((i + 1))
 	done
 
-	PHY=`ls -d $port_dir/phy* 2>/dev/null | head -1 | awk -F: '{print $NF}'`
+	PHY=$(ls -vd "$port_dir"/phy* 2>/dev/null | head -1 | awk -F: '{print $NF}')
 	if [ -z "$PHY" ] ; then
 		PHY=0
 	fi
-	PORT=$(( $PHY / $PHYS_PER_PORT ))
+	PORT=$((PHY / PHYS_PER_PORT))
 
 	# Look in /sys/.../sas_device/end_device-X for the bay_identifier
 	# attribute.
 	end_device_dir=$port_dir
-	while [ $i -lt $num_dirs ] ; do
+
-		d=$(eval echo \${$i})
+	while [ $i -lt "$num_dirs" ] ; do
+		d=$(eval echo '$'{$i})
 		end_device_dir="$end_device_dir/$d"
-		if echo $d | grep -q '^end_device' ; then
+		if echo "$d" | grep -q '^end_device' ; then
 			end_device_dir="$end_device_dir/sas_device/$d"
 			break
 		fi
-		i=$(($i + 1))
+		i=$((i + 1))
 	done
 
+	# Add 'mix' slot type for environments where dm-multipath devices
+	# include end-devices connected via SAS expanders or direct connection
+	# to SAS HBA. A mixed connectivity environment such as pool devices
+	# contained in a SAS JBOD and spare drives or log devices directly
+	# connected in a server backplane without expanders in the I/O path.
 	SLOT=
+
 	case $BAY in
 	"bay")
-		SLOT=`cat $end_device_dir/bay_identifier 2>/dev/null`
+		SLOT=$(cat "$end_device_dir/bay_identifier" 2>/dev/null)
+		;;
+	"mix")
+		if [ $(cat "$end_device_dir/bay_identifier" 2>/dev/null) ] ; then
+			SLOT=$(cat "$end_device_dir/bay_identifier" 2>/dev/null)
+		else
+			SLOT=$(cat "$end_device_dir/phy_identifier" 2>/dev/null)
+		fi
 		;;
 	"phy")
-		SLOT=`cat $end_device_dir/phy_identifier 2>/dev/null`
+		SLOT=$(cat "$end_device_dir/phy_identifier" 2>/dev/null)
 		;;
 	"port")
-		d=$(eval echo \${$i})
+		d=$(eval echo '$'{$i})
-		SLOT=`echo $d | sed -e 's/^.*://'`
+		SLOT=$(echo "$d" | sed -e 's/^.*://')
 		;;
 	"id")
-		i=$(($i + 1))
+		i=$((i + 1))
-		d=$(eval echo \${$i})
+		d=$(eval echo '$'{$i})
-		SLOT=`echo $d | sed -e 's/^.*://'`
+		SLOT=$(echo "$d" | sed -e 's/^.*://')
 		;;
 	"lun")
-		i=$(($i + 2))
+		i=$((i + 2))
-		d=$(eval echo \${$i})
+		d=$(eval echo '$'{$i})
-		SLOT=`echo $d | sed -e 's/^.*://'`
+		SLOT=$(echo "$d" | sed -e 's/^.*://')
 		;;
 	"ses")
 		# look for this SAS path in all SCSI Enclosure Services
 		# (SES) enclosures
-		sas_address=`cat $end_device_dir/sas_address 2>/dev/null`
+		sas_address=$(cat "$end_device_dir/sas_address" 2>/dev/null)
-		enclosures=`lsscsi -g | \
+		enclosures=$(lsscsi -g | \
-			sed -n -e '/enclosu/s/^.* \([^ ][^ ]*\) *$/\1/p'`
+			sed -n -e '/enclosu/s/^.* \([^ ][^ ]*\) *$/\1/p')
 		for enclosure in $enclosures; do
-			set -- $(sg_ses -p aes $enclosure | \
+			set -- $(sg_ses -p aes "$enclosure" | \
 				awk "/device slot number:/{slot=\$12} \
 					/SAS address: $sas_address/\
 					{print slot}")
@@ -298,42 +452,55 @@ sas_handler() {
 		return
 	fi
 
-	CHAN=`map_channel $PCI_ID $PORT`
+	if [ "$MULTIJBOD_MODE" = "yes" ] ; then
-	SLOT=`map_slot $SLOT $CHAN`
+		CHAN=$(map_channel "$PCI_ID" "$PORT")
+		SLOT=$(map_slot "$SLOT" "$CHAN")
+		JBOD=$(map_jbod "$DEV")
+
 		if [ -z "$CHAN" ] ; then
 			return
 		fi
-	echo ${CHAN}${SLOT}${PART}
+		echo "${CHAN}"-"${JBOD}"-"${SLOT}${PART}"
+	else
+		CHAN=$(map_channel "$PCI_ID" "$PORT")
+		SLOT=$(map_slot "$SLOT" "$CHAN")
+
+		if [ -z "$CHAN" ] ; then
+			return
+		fi
+		echo "${CHAN}${SLOT}${PART}"
+	fi
 }
 
 scsi_handler() {
 	if [ -z "$FIRST_BAY_NUMBER" ] ; then
-		FIRST_BAY_NUMBER=`awk "\\$1 == \"first_bay_number\" \
+		FIRST_BAY_NUMBER=$(awk '$1 == "first_bay_number" \
-			{print \\$2; exit}" $CONFIG`
+			{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\" \
+		PHYS_PER_PORT=$(awk '$1 == "phys_per_port" \
-			{print \\$2; exit}" $CONFIG`
+			{print $2; exit}' $CONFIG)
 	fi
 	PHYS_PER_PORT=${PHYS_PER_PORT:-4}
-	if ! echo $PHYS_PER_PORT | grep -q -E '^[0-9]+$' ; then
+
+	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\" \
+		MULTIPATH_MODE=$(awk '$1 == "multipath" \
-			{print \\$2; exit}" $CONFIG`
+			{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 |
+			DM_NAME=$(ls -l --full-time /dev/mapper |
-				awk "/\/$DEV$/{print \\$9}"`
+				grep "$DEV"$ | awk '{print $9}')
 		fi
 
 		# For raw disks udev exports DEVTYPE=partition when
@@ -343,28 +510,30 @@ scsi_handler() {
 		# we have to append the -part suffix directly in the
 		# helper.
 		if [ "$DEVTYPE" != "partition" ] ; then
-			PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
+			# Match p[number], remove the 'p' and prepend "-part"
+			PART=$(echo "$DM_NAME" |
+			    awk 'match($0,/p[0-9]+$/) {print "-part"substr($0,RSTART+1,RLENGTH-1)}')
 		fi
 
 		# Strip off partition information.
-		DM_NAME=`echo $DM_NAME | sed 's/p[0-9][0-9]*$//'`
+		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 $DM_NAME |
+		DEV=$(multipath -ll "$DM_NAME" |
-			awk '/running/{gsub("^[|]"," "); print $3 ; exit}'`
+			awk '/running/{gsub("^[|]"," "); print $3 ; exit}')
 		if [ -z "$DEV" ] ; then
 			return
 		fi
 	fi
 
-	if echo $DEV | grep -q ^/devices/ ; then
+	if echo "$DEV" | grep -q ^/devices/ ; then
 		sys_path=$DEV
 	else
-		sys_path=`udevadm info -q path -p /sys/block/$DEV 2>/dev/null`
+		sys_path=$(udevadm info -q path -p "/sys/block/$DEV" 2>/dev/null)
 	fi
 
 	# expect sys_path like this, for example:
@@ -377,44 +546,47 @@ scsi_handler() {
 
 	# Get path up to /sys/.../hostX
 	i=1
-	while [ $i -le $num_dirs ] ; do
+
-		d=$(eval echo \${$i})
+	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))
+		echo "$d" | grep -q -E '^host[0-9]+$' && break
+		i=$((i + 1))
 	done
 
-	if [ $i = $num_dirs ] ; then
+	if [ $i = "$num_dirs" ] ; then
 		return
 	fi
 
-	PCI_ID=$(eval echo \${$(($i -1))} | awk -F: '{print $2":"$3}')
+	PCI_ID=$(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=$scsi_host_dir
-	j=$(($i + 2))
+	j=$((i + 2))
 
-	i=$(($i + 1))
+	i=$((i + 1))
 	while [ $i -le $j ] ; do
-		port_dir="$port_dir/$(eval echo \${$i})"
+		port_dir="$port_dir/$(eval echo '$'{$i})"
-		i=$(($i + 1))
+		i=$((i + 1))
 	done
 
-	set -- $(echo $port_dir | sed -e 's/^.*:\([^:]*\):\([^:]*\)$/\1 \2/')
+	set -- $(echo "$port_dir" | sed -e 's/^.*:\([^:]*\):\([^:]*\)$/\1 \2/')
 	PORT=$1
-	SLOT=$(($2 + $FIRST_BAY_NUMBER))
+	SLOT=$(($2 + FIRST_BAY_NUMBER))
 
 	if [ -z "$SLOT" ] ; then
 		return
 	fi
 
-	CHAN=`map_channel $PCI_ID $PORT`
+	CHAN=$(map_channel "$PCI_ID" "$PORT")
-	SLOT=`map_slot $SLOT $CHAN`
+	SLOT=$(map_slot "$SLOT" "$CHAN")
+
 	if [ -z "$CHAN" ] ; then
 		return
 	fi
-	echo ${CHAN}${SLOT}${PART}
+	echo "${CHAN}${SLOT}${PART}"
 }
 
 # Figure out the name for the enclosure symlink
@@ -425,7 +597,7 @@ enclosure_handler () {
 
 	# Get the enclosure ID ("0:0:0:0")
 	ENC=$(basename $(readlink -m "/sys/$DEVPATH/../.."))
-	if [ ! -d /sys/class/enclosure/$ENC ] ; then
+	if [ ! -d "/sys/class/enclosure/$ENC" ] ; then
 		# Not an enclosure, bail out
 		return
 	fi
@@ -433,14 +605,14 @@ enclosure_handler () {
 	# 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)
+	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 $ENC_DEVICE | grep -Eo '.+host[0-9]+/port-[0-9]+:[0-9]+')
+	PORT_DIR=$(echo "$ENC_DEVICE" | grep -Eo '.+host[0-9]+/port-[0-9]+:[0-9]+')
 
 	# Get the port number
-	PORT_ID=$(echo $PORT_DIR | grep -Eo "[0-9]+$")
+	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
@@ -451,7 +623,7 @@ enclosure_handler () {
 
 	# 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]++}" $CONFIG)
+		\$3 == \"$PORT_ID\") {print \$4\$3}}" $CONFIG)
 
 	echo "${NAME}"
 }
@@ -487,9 +659,11 @@ alias_handler () {
 	#          ambiguity seems unavoidable, so devices using this facility
 	#          must not use such names.
 	DM_PART=
-	if echo $DM_NAME | grep -q -E 'p[0-9][0-9]*$' ; then
+	if echo "$DM_NAME" | grep -q -E 'p[0-9][0-9]*$' ; then
 		if [ "$DEVTYPE" != "partition" ] ; then
-			DM_PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
+			# Match p[number], remove the 'p' and prepend "-part"
+			DM_PART=$(echo "$DM_NAME" |
+			    awk 'match($0,/p[0-9]+$/) {print "-part"substr($0,RSTART+1,RLENGTH-1)}')
 		fi
 	fi
 
@@ -497,21 +671,25 @@ alias_handler () {
 	for link in $DEVLINKS ; do
 		# Remove partition information to match key of top-level device.
 		if [ -n "$DM_PART" ] ; then
-			link=`echo $link | sed 's/p[0-9][0-9]*$//'`
+			link=$(echo "$link" | sed 's/p[0-9][0-9]*$//')
 		fi
 		# Check both the fully qualified and the base name of link.
-		for l in $link `basename $link` ; do
+		for l in $link $(basename "$link") ; do
-			alias=`awk "\\$1 == \"alias\" && \\$3 == \"${l}\" \
+			if [ ! -z "$l" ]; then
-					{ print \\$2; exit }" $CONFIG`
+				alias=$(awk -v var="$l" '($1 == "alias") && \
+					($3 == var) \
+					{ print $2; exit }' $CONFIG)
 				if [ -n "$alias" ] ; then
-				echo ${alias}${DM_PART}
+					echo "${alias}${DM_PART}"
 					return
 				fi
+			fi
 		done
 	done
 }
 
-while getopts 'c:d:eg:mp:h' OPTION; do
+# main
+while getopts 'c:d:eg:jmp:h' OPTION; do
 	case ${OPTION} in
 	c)
 		CONFIG=${OPTARG}
@@ -524,7 +702,9 @@ while getopts 'c:d:eg:mp:h' OPTION; do
 	# 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}' $CONFIG)
+	ENCLOSURE_MODE=$(awk '{if ($1 == "enclosure_symlinks") \
+		print $2}' "$CONFIG")
+
 	if [ "$ENCLOSURE_MODE" != "yes" ] ; then
 		exit 0
 	fi
@@ -535,6 +715,9 @@ while getopts 'c:d:eg:mp:h' OPTION; do
 	p)
 		PHYS_PER_PORT=${OPTARG}
 		;;
+	j)
+		MULTIJBOD_MODE=yes
+		;;
 	m)
 		MULTIPATH_MODE=yes
 		;;
@@ -544,9 +727,9 @@ while getopts 'c:d:eg:mp:h' OPTION; do
 	esac
 done
 
-if [ ! -r $CONFIG ] ; then
+if [ ! -r "$CONFIG" ] ; then
 	echo "Error: Config file \"$CONFIG\" not found"
-	exit 0
+	exit 1
 fi
 
 if [ -z "$DEV" ] && [ -z "$ENCLOSURE_MODE" ] ; then
@@ -555,11 +738,11 @@ if [ -z "$DEV" ] && [ -z "$ENCLOSURE_MODE" ] ; then
 fi
 
 if [ -z "$TOPOLOGY" ] ; then
-	TOPOLOGY=`awk "\\$1 == \"topology\" {print \\$2; exit}" $CONFIG`
+	TOPOLOGY=$(awk '($1 == "topology") {print $2; exit}' "$CONFIG")
 fi
 
 if [ -z "$BAY" ] ; then
-	BAY=`awk "\\$1 == \"slot\" {print \\$2; exit}" $CONFIG`
+	BAY=$(awk '($1 == "slot") {print $2; exit}' "$CONFIG")
 fi
 
 TOPOLOGY=${TOPOLOGY:-sas_direct}
@@ -572,7 +755,7 @@ if [ "$ENCLOSURE_MODE" = "yes" ] && [ "$TOPOLOGY" = "sas_direct" ] ; then
 	fi
 
 	# Just create the symlinks to the enclosure devices and then exit.
-	ENCLOSURE_PREFIX=$(awk '/enclosure_symlinks_prefix/{print $2}' $CONFIG)
+	ENCLOSURE_PREFIX=$(awk '/enclosure_symlinks_prefix/{print $2}' "$CONFIG")
 	if [ -z "$ENCLOSURE_PREFIX" ] ; then
 		ENCLOSURE_PREFIX="enc"
 	fi
@@ -582,16 +765,16 @@ if [ "$ENCLOSURE_MODE" = "yes" ] && [ "$TOPOLOGY" = "sas_direct" ] ; then
 fi
 
 # First check if an alias was defined for this device.
-ID_VDEV=`alias_handler`
+ID_VDEV=$(alias_handler)
 
 if [ -z "$ID_VDEV" ] ; then
 	BAY=${BAY:-bay}
 	case $TOPOLOGY in
 		sas_direct|sas_switch)
-			ID_VDEV=`sas_handler`
+			ID_VDEV=$(sas_handler)
 			;;
 		scsi)
-			ID_VDEV=`scsi_handler`
+			ID_VDEV=$(scsi_handler)
 			;;
 		*)
 			echo "Error: unknown topology $TOPOLOGY"

cmd/zdb/Makefile.am

@@ -14,3 +14,5 @@ zdb_LDADD = \
 	$(abs_top_builddir)/lib/libzpool/libzpool.la \
 	$(abs_top_builddir)/lib/libzfs_core/libzfs_core.la \
 	$(abs_top_builddir)/lib/libnvpair/libnvpair.la
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zdb/zdb.c

@@ -161,12 +161,6 @@ static int dump_bpobj_cb(void *arg, const blkptr_t *bp, boolean_t free,
     dmu_tx_t *tx);
 
 typedef struct sublivelist_verify {
-	/* all ALLOC'd blkptr_t in one sub-livelist */
-	zfs_btree_t sv_all_allocs;
-
-	/* all FREE'd blkptr_t in one sub-livelist */
-	zfs_btree_t sv_all_frees;
-
 	/* FREE's that haven't yet matched to an ALLOC, in one sub-livelist */
 	zfs_btree_t sv_pair;
 
@@ -225,29 +219,68 @@ typedef struct sublivelist_verify_block {
 
 static void zdb_print_blkptr(const blkptr_t *bp, int flags);
 
+typedef struct sublivelist_verify_block_refcnt {
+	/* block pointer entry in livelist being verified */
+	blkptr_t svbr_blk;
+
+	/*
+	 * Refcount gets incremented to 1 when we encounter the first
+	 * FREE entry for the svfbr block pointer and a node for it
+	 * is created in our ZDB verification/tracking metadata.
+	 *
+	 * As we encounter more FREE entries we increment this counter
+	 * and similarly decrement it whenever we find the respective
+	 * ALLOC entries for this block.
+	 *
+	 * When the refcount gets to 0 it means that all the FREE and
+	 * ALLOC entries of this block have paired up and we no longer
+	 * need to track it in our verification logic (e.g. the node
+	 * containing this struct in our verification data structure
+	 * should be freed).
+	 *
+	 * [refer to sublivelist_verify_blkptr() for the actual code]
+	 */
+	uint32_t svbr_refcnt;
+} sublivelist_verify_block_refcnt_t;
+
+static int
+sublivelist_block_refcnt_compare(const void *larg, const void *rarg)
+{
+	const sublivelist_verify_block_refcnt_t *l = larg;
+	const sublivelist_verify_block_refcnt_t *r = rarg;
+	return (livelist_compare(&l->svbr_blk, &r->svbr_blk));
+}
+
 static int
 sublivelist_verify_blkptr(void *arg, const blkptr_t *bp, boolean_t free,
     dmu_tx_t *tx)
 {
 	ASSERT3P(tx, ==, NULL);
 	struct sublivelist_verify *sv = arg;
-	char blkbuf[BP_SPRINTF_LEN];
+	sublivelist_verify_block_refcnt_t current = {
+			.svbr_blk = *bp,
+
+			/*
+			 * Start with 1 in case this is the first free entry.
+			 * This field is not used for our B-Tree comparisons
+			 * anyway.
+			 */
+			.svbr_refcnt = 1,
+	};
+
 	zfs_btree_index_t where;
+	sublivelist_verify_block_refcnt_t *pair =
+	    zfs_btree_find(&sv->sv_pair, &current, &where);
 	if (free) {
-		zfs_btree_add(&sv->sv_pair, bp);
+		if (pair == NULL) {
-		/* Check if the FREE is a duplicate */
+			/* first free entry for this block pointer */
-		if (zfs_btree_find(&sv->sv_all_frees, bp, &where) != NULL) {
+			zfs_btree_add(&sv->sv_pair, &current);
-			snprintf_blkptr_compact(blkbuf, sizeof (blkbuf), bp,
-			    free);
-			(void) printf("\tERROR: Duplicate FREE: %s\n", blkbuf);
 		} else {
-			zfs_btree_add_idx(&sv->sv_all_frees, bp, &where);
+			pair->svbr_refcnt++;
 		}
 	} else {
-		/* Check if the ALLOC has been freed */
+		if (pair == NULL) {
-		if (zfs_btree_find(&sv->sv_pair, bp, &where) != NULL) {
+			/* block that is currently marked as allocated */
-			zfs_btree_remove_idx(&sv->sv_pair, &where);
-		} else {
 			for (int i = 0; i < SPA_DVAS_PER_BP; i++) {
 				if (DVA_IS_EMPTY(&bp->blk_dva[i]))
 					break;
@@ -262,16 +295,16 @@ sublivelist_verify_blkptr(void *arg, const blkptr_t *bp, boolean_t free,
 					    &svb, &where);
 				}
 			}
-		}
-		/* Check if the ALLOC is a duplicate */
-		if (zfs_btree_find(&sv->sv_all_allocs, bp, &where) != NULL) {
-			snprintf_blkptr_compact(blkbuf, sizeof (blkbuf), bp,
-			    free);
-			(void) printf("\tERROR: Duplicate ALLOC: %s\n", blkbuf);
 		} else {
-			zfs_btree_add_idx(&sv->sv_all_allocs, bp, &where);
+			/* alloc matches a free entry */
+			pair->svbr_refcnt--;
+			if (pair->svbr_refcnt == 0) {
+				/* all allocs and frees have been matched */
+				zfs_btree_remove_idx(&sv->sv_pair, &where);
 			}
 		}
+	}
+
 	return (0);
 }
 
@@ -279,32 +312,22 @@ static int
 sublivelist_verify_func(void *args, dsl_deadlist_entry_t *dle)
 {
 	int err;
-	char blkbuf[BP_SPRINTF_LEN];
 	struct sublivelist_verify *sv = args;
 
-	zfs_btree_create(&sv->sv_all_allocs, livelist_compare,
+	zfs_btree_create(&sv->sv_pair, sublivelist_block_refcnt_compare,
-	    sizeof (blkptr_t));
+	    sizeof (sublivelist_verify_block_refcnt_t));
-
-	zfs_btree_create(&sv->sv_all_frees, livelist_compare,
-	    sizeof (blkptr_t));
-
-	zfs_btree_create(&sv->sv_pair, livelist_compare,
-	    sizeof (blkptr_t));
 
 	err = bpobj_iterate_nofree(&dle->dle_bpobj, sublivelist_verify_blkptr,
 	    sv, NULL);
 
-	zfs_btree_clear(&sv->sv_all_allocs);
+	sublivelist_verify_block_refcnt_t *e;
-	zfs_btree_destroy(&sv->sv_all_allocs);
-
-	zfs_btree_clear(&sv->sv_all_frees);
-	zfs_btree_destroy(&sv->sv_all_frees);
-
-	blkptr_t *e;
 	zfs_btree_index_t *cookie = NULL;
 	while ((e = zfs_btree_destroy_nodes(&sv->sv_pair, &cookie)) != NULL) {
-		snprintf_blkptr_compact(blkbuf, sizeof (blkbuf), e, B_TRUE);
+		char blkbuf[BP_SPRINTF_LEN];
-		(void) printf("\tERROR: Unmatched FREE: %s\n", blkbuf);
+		snprintf_blkptr_compact(blkbuf, sizeof (blkbuf),
+		    &e->svbr_blk, B_TRUE);
+		(void) printf("\tERROR: %d unmatched FREE(s): %s\n",
+		    e->svbr_refcnt, blkbuf);
 	}
 	zfs_btree_destroy(&sv->sv_pair);
 
@@ -613,10 +636,14 @@ mv_populate_livelist_allocs(metaslab_verify_t *mv, sublivelist_verify_t *sv)
 /*
  * [Livelist Check]
  * Iterate through all the sublivelists and:
- * - report leftover frees
+ * - report leftover frees (**)
- * - report double ALLOCs/FREEs
  * - record leftover ALLOCs together with their TXG [see Cross Check]
  *
+ * (**) Note: Double ALLOCs are valid in datasets that have dedup
+ *      enabled. Similarly double FREEs are allowed as well but
+ *      only if they pair up with a corresponding ALLOC entry once
+ *      we our done with our sublivelist iteration.
+ *
  * [Spacemap Check]
  * for each metaslab:
  * - iterate over spacemap and then the metaslab's entries in the
@@ -2184,7 +2211,8 @@ snprintf_zstd_header(spa_t *spa, char *blkbuf, size_t buflen,
 		(void) snprintf(blkbuf + strlen(blkbuf),
 		    buflen - strlen(blkbuf),
 		    " ZSTD:size=%u:version=%u:level=%u:EMBEDDED",
-		    zstd_hdr.c_len, zstd_hdr.version, zstd_hdr.level);
+		    zstd_hdr.c_len, zfs_get_hdrversion(&zstd_hdr),
+		    zfs_get_hdrlevel(&zstd_hdr));
 		return;
 	}
 
@@ -2208,7 +2236,8 @@ snprintf_zstd_header(spa_t *spa, char *blkbuf, size_t buflen,
 	(void) snprintf(blkbuf + strlen(blkbuf),
 	    buflen - strlen(blkbuf),
 	    " ZSTD:size=%u:version=%u:level=%u:NORMAL",
-	    zstd_hdr.c_len, zstd_hdr.version, zstd_hdr.level);
+	    zstd_hdr.c_len, zfs_get_hdrversion(&zstd_hdr),
+	    zfs_get_hdrlevel(&zstd_hdr));
 
 	abd_return_buf_copy(pabd, buf, BP_GET_LSIZE(bp));
 }
@@ -4060,7 +4089,7 @@ cksum_record_compare(const void *x1, const void *x2)
 	const cksum_record_t *l = (cksum_record_t *)x1;
 	const cksum_record_t *r = (cksum_record_t *)x2;
 	int arraysize = ARRAY_SIZE(l->cksum.zc_word);
-	int difference;
+	int difference = 0;
 
 	for (int i = 0; i < arraysize; i++) {
 		difference = TREE_CMP(l->cksum.zc_word[i], r->cksum.zc_word[i]);
@@ -4535,7 +4564,7 @@ dump_path_impl(objset_t *os, uint64_t obj, char *name)
 	case DMU_OT_DIRECTORY_CONTENTS:
 		if (s != NULL && *(s + 1) != '\0')
 			return (dump_path_impl(os, child_obj, s + 1));
-		/*FALLTHROUGH*/
+		fallthrough;
 	case DMU_OT_PLAIN_FILE_CONTENTS:
 		dump_object(os, child_obj, dump_opt['v'], &header, NULL, 0);
 		return (0);
@@ -5840,7 +5869,8 @@ zdb_leak_init_prepare_indirect_vdevs(spa_t *spa, zdb_cb_t *zcb)
 		 */
 		VERIFY0(vdev_metaslab_init(vd, 0));
 
-		vdev_indirect_mapping_t *vim = vd->vdev_indirect_mapping;
+		vdev_indirect_mapping_t *vim __maybe_unused =
+		    vd->vdev_indirect_mapping;
 		uint64_t vim_idx = 0;
 		for (uint64_t m = 0; m < vd->vdev_ms_count; m++) {
 
@@ -6933,7 +6963,7 @@ verify_checkpoint_vdev_spacemaps(spa_t *checkpoint, spa_t *current)
 		for (uint64_t c = ckpoint_rvd->vdev_children;
 		    c < current_rvd->vdev_children; c++) {
 			vdev_t *current_vd = current_rvd->vdev_child[c];
-			ASSERT3P(current_vd->vdev_checkpoint_sm, ==, NULL);
+			VERIFY3P(current_vd->vdev_checkpoint_sm, ==, NULL);
 		}
 	}
 

cmd/zed/Makefile.am

@@ -47,3 +47,5 @@ zed_LDADD += -lrt $(LIBUDEV_LIBS) $(LIBUUID_LIBS)
 zed_LDFLAGS = -pthread
 
 EXTRA_DIST = agents/README.md
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zed/zed.d/statechange-led.sh

@@ -1,21 +1,21 @@
 #!/bin/sh
 #
-# Turn off/on the VDEV's enclosure fault LEDs when the pool's state changes.
+# Turn off/on vdevs' enclosure fault LEDs when their pool's state changes.
 #
-# Turn the VDEV's fault LED on if it becomes FAULTED, DEGRADED or UNAVAIL.
+# Turn a vdev's fault LED on if it becomes FAULTED, DEGRADED or UNAVAIL.
-# Turn the LED off when it's back ONLINE again.
+# Turn its LED off when it's back ONLINE again.
 #
 # This script run in two basic modes:
 #
 # 1. If $ZEVENT_VDEV_ENC_SYSFS_PATH and $ZEVENT_VDEV_STATE_STR are set, then
-# only set the LED for that particular VDEV. This is the case for statechange
+# only set the LED for that particular vdev. This is the case for statechange
 # events and some vdev_* events.
 #
-# 2. If those vars are not set, then check the state of all VDEVs in the pool
+# 2. If those vars are not set, then check the state of all vdevs in the pool
 # and set the LEDs accordingly.  This is the case for pool_import events.
 #
 # Note that this script requires that your enclosure be supported by the
-# Linux SCSI enclosure services (ses) driver.  The script will do nothing
+# Linux SCSI Enclosure services (SES) driver.  The script will do nothing
 # if you have no enclosure, or if your enclosure isn't supported.
 #
 # Exit codes:
@@ -29,7 +29,8 @@
 [ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
 . "${ZED_ZEDLET_DIR}/zed-functions.sh"
 
-if [ ! -d /sys/class/enclosure ] ; then
+if [ ! -d /sys/class/enclosure ] && [ ! -d /sys/bus/pci/slots ] ; then
+	# No JBOD enclosure or NVMe slots
 	exit 1
 fi
 
@@ -59,6 +60,10 @@ check_and_set_led()
 	file="$1"
 	val="$2"
 
+	if [ -z "$val" ]; then
+		return 0
+	fi
+
 	if [ ! -e "$file" ] ; then
 		return 3
 	fi
@@ -66,11 +71,11 @@ check_and_set_led()
 	# If another process is accessing the LED when we attempt to update it,
 	# the update will be lost so retry until the LED actually changes or we
 	# timeout.
-	for _ in $(seq 1 5); do
+	for _ in 1 2 3 4 5; do
 		# We want to check the current state first, since writing to the
 		# 'fault' entry always causes a SES command, even if the
 		# current state is already what you want.
-		current=$(cat "${file}")
+		read -r current < "${file}"
 
 		# On some enclosures if you write 1 to fault, and read it back,
 		# it will return 2.  Treat all non-zero values as 1 for
@@ -88,24 +93,81 @@ check_and_set_led()
 	done
 }
 
-state_to_val()
+# Fault LEDs for JBODs and NVMe drives are handled a little differently.
+#
+# On JBODs the fault LED is called 'fault' and on a path like this:
+#
+#   /sys/class/enclosure/0:0:1:0/SLOT 10/fault
+#
+# On NVMe it's called 'attention' and on a path like this:
+#
+#   /sys/bus/pci/slot/0/attention
+#
+# This function returns the full path to the fault LED file for a given
+# enclosure/slot directory.
+#
+path_to_led()
 {
-	state="$1"
+	dir=$1
-	if [ "$state" = "FAULTED" ] || [ "$state" = "DEGRADED" ] || \
+	if [ -f "$dir/fault" ] ; then
-	   [ "$state" = "UNAVAIL" ] ; then
+		echo "$dir/fault"
-		echo 1
+	elif [ -f "$dir/attention" ] ; then
-	elif [ "$state" = "ONLINE" ] ; then
+		echo "$dir/attention"
-		echo 0
 	fi
 }
 
-# process_pool ([pool])
+state_to_val()
+{
+	state="$1"
+	case "$state" in
+		FAULTED|DEGRADED|UNAVAIL)
+			echo 1
+			;;
+		ONLINE)
+			echo 0
+			;;
+	esac
+}
+
 #
-# Iterate through a pool (or pools) and set the VDEV's enclosure slot LEDs to
+# Given a nvme name like 'nvme0n1', pass back its slot directory
-# the VDEV's state.
+# like "/sys/bus/pci/slots/0"
+#
+nvme_dev_to_slot()
+{
+	dev="$1"
+
+	# Get the address "0000:01:00.0"
+	address=$(cat "/sys/class/block/$dev/device/address")
+
+	# For each /sys/bus/pci/slots subdir that is an actual number
+	# (rather than weird directories like "1-3/").
+	# shellcheck disable=SC2010
+	for i in $(ls /sys/bus/pci/slots/ | grep -E "^[0-9]+$") ; do
+		this_address=$(cat "/sys/bus/pci/slots/$i/address")
+
+		# The format of address is a little different between
+		# /sys/class/block/$dev/device/address and
+		# /sys/bus/pci/slots/
+		#
+		# address=           "0000:01:00.0"
+		# this_address =     "0000:01:00"
+		#
+		if echo "$address" | grep -Eq ^"$this_address" ; then
+			echo "/sys/bus/pci/slots/$i"
+			break
+		fi
+	done
+}
+
+
+# process_pool (pool)
+#
+# Iterate through a pool and set the vdevs' enclosure slot LEDs to
+# those vdevs' state.
 #
 # Arguments
-#   pool:	Optional pool name.  If not specified, iterate though all pools.
+#   pool:	Pool name.
 #
 # Return
 #  0 on success, 3 on missing sysfs path
@@ -113,19 +175,27 @@ state_to_val()
 process_pool()
 {
 	pool="$1"
+
+	# The output will be the vdevs only (from "grep '/dev/'"):
+	#
+	#    U45     ONLINE       0     0     0   /dev/sdk          0
+	#    U46     ONLINE       0     0     0   /dev/sdm          0
+	#    U47     ONLINE       0     0     0   /dev/sdn          0
+	#    U50     ONLINE       0     0     0  /dev/sdbn          0
+	#
+	ZPOOL_SCRIPTS_AS_ROOT=1 $ZPOOL status -c upath,fault_led "$pool" | grep '/dev/' | (
 	rc=0
-
+	while read -r vdev state _ _ _ therest; do
-	# Lookup all the current LED values and paths in parallel
-	#shellcheck disable=SC2016
-	cmd='echo led_token=$(cat "$VDEV_ENC_SYSFS_PATH/fault"),"$VDEV_ENC_SYSFS_PATH",'
-	out=$($ZPOOL status -vc "$cmd" "$pool" | grep 'led_token=')
-
-	#shellcheck disable=SC2034
-	echo "$out" | while read -r vdev state read write chksum therest; do
 		# Read out current LED value and path
-		tmp=$(echo "$therest" | sed 's/^.*led_token=//g')
+		# Get dev name (like 'sda')
-		vdev_enc_sysfs_path=$(echo "$tmp" | awk -F ',' '{print $2}')
+		dev=$(basename "$(echo "$therest" | awk '{print $(NF-1)}')")
-		current_val=$(echo "$tmp" | awk -F ',' '{print $1}')
+		vdev_enc_sysfs_path=$(realpath "/sys/class/block/$dev/device/enclosure_device"*)
+		if [ ! -d "$vdev_enc_sysfs_path" ] ; then
+			# This is not a JBOD disk, but it could be a PCI NVMe drive
+			vdev_enc_sysfs_path=$(nvme_dev_to_slot "$dev")
+		fi
+
+		current_val=$(echo "$therest" | awk '{print $NF}')
 
 		if [ "$current_val" != "0" ] ; then
 			current_val=1
@@ -136,40 +206,33 @@ process_pool()
 			continue
 		fi
 
-		if [ ! -e "$vdev_enc_sysfs_path/fault" ] ; then
+		led_path=$(path_to_led "$vdev_enc_sysfs_path")
-			#shellcheck disable=SC2030
+		if [ ! -e "$led_path" ] ; then
-			rc=1
+			rc=3
-			zed_log_msg "vdev $vdev '$file/fault' doesn't exist"
+			zed_log_msg "vdev $vdev '$led_path' doesn't exist"
-			continue;
+			continue
 		fi
 
 		val=$(state_to_val "$state")
 
 		if [ "$current_val" = "$val" ] ; then
 			# LED is already set correctly
-			continue;
+			continue
 		fi
 
-		if ! check_and_set_led "$vdev_enc_sysfs_path/fault" "$val"; then
+		if ! check_and_set_led "$led_path" "$val"; then
-			rc=1
+			rc=3
 		fi
-
 	done
-
+	exit "$rc"; )
-	#shellcheck disable=SC2031
-	if [ "$rc" = "0" ] ; then
-		return 0
-	else
-		# We didn't see a sysfs entry that we wanted to set
-		return 3
-	fi
 }
 
 if [ -n "$ZEVENT_VDEV_ENC_SYSFS_PATH" ] && [ -n "$ZEVENT_VDEV_STATE_STR" ] ; then
-	# Got a statechange for an individual VDEV
+	# Got a statechange for an individual vdev
 	val=$(state_to_val "$ZEVENT_VDEV_STATE_STR")
 	vdev=$(basename "$ZEVENT_VDEV_PATH")
-	check_and_set_led "$ZEVENT_VDEV_ENC_SYSFS_PATH/fault" "$val"
+	ledpath=$(path_to_led "$ZEVENT_VDEV_ENC_SYSFS_PATH")
+	check_and_set_led "$ledpath" "$val"
 else
 	# Process the entire pool
 	poolname=$(zed_guid_to_pool "$ZEVENT_POOL_GUID")

cmd/zed/zed.d/zed.rc

@@ -89,8 +89,8 @@
 
 ##
 # Turn on/off enclosure LEDs when drives get DEGRADED/FAULTED.  This works for
-# device mapper and multipath devices as well.  Your enclosure must be
+# device mapper and multipath devices as well.  This works with JBOD enclosures
-# supported by the Linux SES driver for this to work.
+# and NVMe PCI drives (assuming they're supported by Linux in sysfs).
 #
 ZED_USE_ENCLOSURE_LEDS=1
 

cmd/zed/zed_exec.c

@@ -173,6 +173,7 @@ _zed_exec_fork_child(uint64_t eid, const char *dir, const char *prog,
 		zed_log_msg(LOG_WARNING, "Killing hung \"%s\" pid=%d",
 		    prog, pid);
 		(void) kill(pid, SIGKILL);
+		(void) waitpid(pid, &status, 0);
 	}
 }
 

cmd/zed/zed_file.c

@@ -12,11 +12,11 @@
  * You may not use this file except in compliance with the license.
  */
 
+#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <string.h>
-#include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -160,6 +160,13 @@ zed_file_is_locked(int fd)
 	return (lock.l_pid);
 }
 
+
+#if __APPLE__
+#define	PROC_SELF_FD "/dev/fd"
+#else /* Linux-compatible layout */
+#define	PROC_SELF_FD "/proc/self/fd"
+#endif
+
 /*
  * Close all open file descriptors greater than or equal to [lowfd].
  * Any errors encountered while closing file descriptors are ignored.
@@ -167,20 +174,21 @@ zed_file_is_locked(int fd)
 void
 zed_file_close_from(int lowfd)
 {
-	const int maxfd_def = 256;
+	int errno_bak = errno;
-	int errno_bak;
+	int maxfd = 0;
-	struct rlimit rl;
-	int maxfd;
 	int fd;
+	DIR *fddir;
+	struct dirent *fdent;
 
-	errno_bak = errno;
+	if ((fddir = opendir(PROC_SELF_FD)) != NULL) {
-
+		while ((fdent = readdir(fddir)) != NULL) {
-	if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
+			fd = atoi(fdent->d_name);
-		maxfd = maxfd_def;
+			if (fd > maxfd && fd != dirfd(fddir))
-	} else if (rl.rlim_max == RLIM_INFINITY) {
+				maxfd = fd;
-		maxfd = maxfd_def;
+		}
+		(void) closedir(fddir);
 	} else {
-		maxfd = rl.rlim_max;
+		maxfd = sysconf(_SC_OPEN_MAX);
 	}
 	for (fd = lowfd; fd < maxfd; fd++)
 		(void) close(fd);

cmd/zfs/Makefile.am

@@ -21,3 +21,5 @@ zfs_LDADD += $(LTLIBINTL)
 if BUILD_FREEBSD
 zfs_LDADD += -lgeom -ljail
 endif
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zfs/zfs_main.c

@@ -730,6 +730,32 @@ finish_progress(char *done)
 	pt_header = NULL;
 }
 
+/* This function checks if the passed fd refers to /dev/null or /dev/zero */
+#ifdef __linux__
+static boolean_t
+is_dev_nullzero(int fd)
+{
+	struct stat st;
+	fstat(fd, &st);
+	return (major(st.st_rdev) == 1 && (minor(st.st_rdev) == 3 /* null */ ||
+	    minor(st.st_rdev) == 5 /* zero */));
+}
+#endif
+
+static void
+note_dev_error(int err, int fd)
+{
+#ifdef __linux__
+	if (err == EINVAL && is_dev_nullzero(fd)) {
+		(void) fprintf(stderr,
+		    gettext("Error: Writing directly to /dev/{null,zero} files"
+		    " on certain kernels is not currently implemented.\n"
+		    "(As a workaround, "
+		    "try \"zfs send [...] | cat > /dev/null\")\n"));
+	}
+#endif
+}
+
 static int
 zfs_mount_and_share(libzfs_handle_t *hdl, const char *dataset, zfs_type_t type)
 {
@@ -4448,11 +4474,16 @@ zfs_do_send(int argc, char **argv)
 
 		err = zfs_send_saved(zhp, &flags, STDOUT_FILENO,
 		    resume_token);
+		if (err != 0)
+			note_dev_error(errno, STDOUT_FILENO);
 		zfs_close(zhp);
 		return (err != 0);
 	} else if (resume_token != NULL) {
-		return (zfs_send_resume(g_zfs, &flags, STDOUT_FILENO,
+		err = zfs_send_resume(g_zfs, &flags, STDOUT_FILENO,
-		    resume_token));
+		    resume_token);
+		if (err != 0)
+			note_dev_error(errno, STDOUT_FILENO);
+		return (err);
 	}
 
 	/*
@@ -4496,6 +4527,8 @@ zfs_do_send(int argc, char **argv)
 		err = zfs_send_one(zhp, fromname, STDOUT_FILENO, &flags,
 		    redactbook);
 		zfs_close(zhp);
+		if (err != 0)
+			note_dev_error(errno, STDOUT_FILENO);
 		return (err != 0);
 	}
 
@@ -4572,6 +4605,7 @@ zfs_do_send(int argc, char **argv)
 		nvlist_free(dbgnv);
 	}
 	zfs_close(zhp);
+	note_dev_error(errno, STDOUT_FILENO);
 
 	return (err != 0);
 }
@@ -6790,9 +6824,6 @@ report_mount_progress(int current, int total)
 	time_t now = time(NULL);
 	char info[32];
 
-	/* report 1..n instead of 0..n-1 */
-	++current;
-
 	/* display header if we're here for the first time */
 	if (current == 1) {
 		set_progress_header(gettext("Mounting ZFS filesystems"));
@@ -7313,6 +7344,7 @@ unshare_unmount(int op, int argc, char **argv)
 				if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) ==
 				    ZFS_CANMOUNT_NOAUTO)
 					continue;
+				break;
 			default:
 				break;
 			}

cmd/zfs_ids_to_path/Makefile.am

@@ -7,3 +7,5 @@ zfs_ids_to_path_SOURCES = \
 
 zfs_ids_to_path_LDADD = \
         $(abs_top_builddir)/lib/libzfs/libzfs.la
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zgenhostid/Makefile.am

@@ -3,3 +3,5 @@ include $(top_srcdir)/config/Rules.am
 sbin_PROGRAMS = zgenhostid
 
 zgenhostid_SOURCES = zgenhostid.c
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zhack/Makefile.am

@@ -12,3 +12,5 @@ zhack_LDADD = \
 	$(abs_top_builddir)/lib/libzpool/libzpool.la \
 	$(abs_top_builddir)/lib/libzfs_core/libzfs_core.la \
 	$(abs_top_builddir)/lib/libnvpair/libnvpair.la
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zinject/Makefile.am

@@ -11,3 +11,5 @@ zinject_LDADD = \
 	$(abs_top_builddir)/lib/libzfs/libzfs.la \
 	$(abs_top_builddir)/lib/libzfs_core/libzfs_core.la \
 	$(abs_top_builddir)/lib/libnvpair/libnvpair.la
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zpool/Makefile.am

@@ -25,7 +25,8 @@ zpool_LDADD = \
 	$(abs_top_builddir)/lib/libzfs/libzfs.la \
 	$(abs_top_builddir)/lib/libzfs_core/libzfs_core.la \
 	$(abs_top_builddir)/lib/libnvpair/libnvpair.la \
-	$(abs_top_builddir)/lib/libuutil/libuutil.la
+	$(abs_top_builddir)/lib/libuutil/libuutil.la \
+	$(abs_top_builddir)/lib/libzutil/libzutil.la
 
 zpool_LDADD += $(LTLIBINTL)
 
@@ -34,6 +35,8 @@ zpool_LDADD += -lgeom
 endif
 zpool_LDADD += -lm $(LIBBLKID_LIBS) $(LIBUUID_LIBS)
 
+include $(top_srcdir)/config/CppCheck.am
+
 zpoolconfdir = $(sysconfdir)/zfs/zpool.d
 zpoolexecdir = $(zfsexecdir)/zpool.d
 

cmd/zpool/zpool.d/ses

@@ -41,7 +41,13 @@ for i in $scripts ; do
 		val=$(ls "$VDEV_ENC_SYSFS_PATH/../device/scsi_generic" 2>/dev/null)
 		;;
 	fault_led)
+		# JBODs fault LED is called 'fault', NVMe fault LED is called
+		# 'attention'.
+		if [ -f "$VDEV_ENC_SYSFS_PATH/fault" ] ; then
 			val=$(cat "$VDEV_ENC_SYSFS_PATH/fault" 2>/dev/null)
+		elif [ -f "$VDEV_ENC_SYSFS_PATH/attention" ] ; then
+			val=$(cat "$VDEV_ENC_SYSFS_PATH/attention" 2>/dev/null)
+		fi
 		;;
 	locate_led)
 		val=$(cat "$VDEV_ENC_SYSFS_PATH/locate" 2>/dev/null)

cmd/zpool/zpool_iter.c

@@ -264,51 +264,6 @@ for_each_pool(int argc, char **argv, boolean_t unavail,
 	return (ret);
 }
 
-static int
-for_each_vdev_cb(zpool_handle_t *zhp, nvlist_t *nv, pool_vdev_iter_f func,
-    void *data)
-{
-	nvlist_t **child;
-	uint_t c, children;
-	int ret = 0;
-	int i;
-	char *type;
-
-	const char *list[] = {
-	    ZPOOL_CONFIG_SPARES,
-	    ZPOOL_CONFIG_L2CACHE,
-	    ZPOOL_CONFIG_CHILDREN
-	};
-
-	for (i = 0; i < ARRAY_SIZE(list); i++) {
-		if (nvlist_lookup_nvlist_array(nv, list[i], &child,
-		    &children) == 0) {
-			for (c = 0; c < children; c++) {
-				uint64_t ishole = 0;
-
-				(void) nvlist_lookup_uint64(child[c],
-				    ZPOOL_CONFIG_IS_HOLE, &ishole);
-
-				if (ishole)
-					continue;
-
-				ret |= for_each_vdev_cb(zhp, child[c], func,
-				    data);
-			}
-		}
-	}
-
-	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0)
-		return (ret);
-
-	/* Don't run our function on root vdevs */
-	if (strcmp(type, VDEV_TYPE_ROOT) != 0) {
-		ret |= func(zhp, nv, data);
-	}
-
-	return (ret);
-}
-
 /*
  * This is the equivalent of for_each_pool() for vdevs.  It iterates thorough
  * all vdevs in the pool, ignoring root vdevs and holes, calling func() on
@@ -327,7 +282,7 @@ for_each_vdev(zpool_handle_t *zhp, pool_vdev_iter_f func, void *data)
 		verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
 		    &nvroot) == 0);
 	}
-	return (for_each_vdev_cb(zhp, nvroot, func, data));
+	return (for_each_vdev_cb((void *) zhp, nvroot, func, data));
 }
 
 /*
@@ -598,7 +553,7 @@ vdev_run_cmd_thread(void *cb_cmd_data)
 
 /* For each vdev in the pool run a command */
 static int
-for_each_vdev_run_cb(zpool_handle_t *zhp, nvlist_t *nv, void *cb_vcdl)
+for_each_vdev_run_cb(void *zhp_data, nvlist_t *nv, void *cb_vcdl)
 {
 	vdev_cmd_data_list_t *vcdl = cb_vcdl;
 	vdev_cmd_data_t *data;
@@ -606,6 +561,7 @@ for_each_vdev_run_cb(zpool_handle_t *zhp, nvlist_t *nv, void *cb_vcdl)
 	char *vname = NULL;
 	char *vdev_enc_sysfs_path = NULL;
 	int i, match = 0;
+	zpool_handle_t *zhp = zhp_data;
 
 	if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0)
 		return (1);

cmd/zpool/zpool_main.c

@@ -2586,8 +2586,8 @@ print_class_vdevs(zpool_handle_t *zhp, status_cbdata_t *cb, nvlist_t *nv,
 /*
  * Display the status for the given pool.
  */
-static void
+static int
-show_import(nvlist_t *config)
+show_import(nvlist_t *config, boolean_t report_error)
 {
 	uint64_t pool_state;
 	vdev_stat_t *vs;
@@ -2619,6 +2619,13 @@ show_import(nvlist_t *config)
 
 	reason = zpool_import_status(config, &msgid, &errata);
 
+	/*
+	 * If we're importing using a cachefile, then we won't report any
+	 * errors unless we are in the scan phase of the import.
+	 */
+	if (reason != ZPOOL_STATUS_OK && !report_error)
+		return (reason);
+
 	(void) printf(gettext("   pool: %s\n"), name);
 	(void) printf(gettext("     id: %llu\n"), (u_longlong_t)guid);
 	(void) printf(gettext("  state: %s"), health);
@@ -2933,6 +2940,7 @@ show_import(nvlist_t *config)
 		    "be part of this pool, though their\n\texact "
 		    "configuration cannot be determined.\n"));
 	}
+	return (0);
 }
 
 static boolean_t
@@ -3071,6 +3079,121 @@ do_import(nvlist_t *config, const char *newname, const char *mntopts,
 	return (ret);
 }
 
+static int
+import_pools(nvlist_t *pools, nvlist_t *props, char *mntopts, int flags,
+    char *orig_name, char *new_name,
+    boolean_t do_destroyed, boolean_t pool_specified, boolean_t do_all,
+    importargs_t *import)
+{
+	nvlist_t *config = NULL;
+	nvlist_t *found_config = NULL;
+	uint64_t pool_state;
+
+	/*
+	 * At this point we have a list of import candidate configs. Even if
+	 * we were searching by pool name or guid, we still need to
+	 * post-process the list to deal with pool state and possible
+	 * duplicate names.
+	 */
+	int err = 0;
+	nvpair_t *elem = NULL;
+	boolean_t first = B_TRUE;
+	while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {
+
+		verify(nvpair_value_nvlist(elem, &config) == 0);
+
+		verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
+		    &pool_state) == 0);
+		if (!do_destroyed && pool_state == POOL_STATE_DESTROYED)
+			continue;
+		if (do_destroyed && pool_state != POOL_STATE_DESTROYED)
+			continue;
+
+		verify(nvlist_add_nvlist(config, ZPOOL_LOAD_POLICY,
+		    import->policy) == 0);
+
+		if (!pool_specified) {
+			if (first)
+				first = B_FALSE;
+			else if (!do_all)
+				(void) printf("\n");
+
+			if (do_all) {
+				err |= do_import(config, NULL, mntopts,
+				    props, flags);
+			} else {
+				/*
+				 * If we're importing from cachefile, then
+				 * we don't want to report errors until we
+				 * are in the scan phase of the import. If
+				 * we get an error, then we return that error
+				 * to invoke the scan phase.
+				 */
+				if (import->cachefile && !import->scan)
+					err = show_import(config, B_FALSE);
+				else
+					(void) show_import(config, B_TRUE);
+			}
+		} else if (import->poolname != NULL) {
+			char *name;
+
+			/*
+			 * We are searching for a pool based on name.
+			 */
+			verify(nvlist_lookup_string(config,
+			    ZPOOL_CONFIG_POOL_NAME, &name) == 0);
+
+			if (strcmp(name, import->poolname) == 0) {
+				if (found_config != NULL) {
+					(void) fprintf(stderr, gettext(
+					    "cannot import '%s': more than "
+					    "one matching pool\n"),
+					    import->poolname);
+					(void) fprintf(stderr, gettext(
+					    "import by numeric ID instead\n"));
+					err = B_TRUE;
+				}
+				found_config = config;
+			}
+		} else {
+			uint64_t guid;
+
+			/*
+			 * Search for a pool by guid.
+			 */
+			verify(nvlist_lookup_uint64(config,
+			    ZPOOL_CONFIG_POOL_GUID, &guid) == 0);
+
+			if (guid == import->guid)
+				found_config = config;
+		}
+	}
+
+	/*
+	 * If we were searching for a specific pool, verify that we found a
+	 * pool, and then do the import.
+	 */
+	if (pool_specified && err == 0) {
+		if (found_config == NULL) {
+			(void) fprintf(stderr, gettext("cannot import '%s': "
+			    "no such pool available\n"), orig_name);
+			err = B_TRUE;
+		} else {
+			err |= do_import(found_config, new_name,
+			    mntopts, props, flags);
+		}
+	}
+
+	/*
+	 * If we were just looking for pools, report an error if none were
+	 * found.
+	 */
+	if (!pool_specified && first)
+		(void) fprintf(stderr,
+		    gettext("no pools available to import\n"));
+	return (err);
+}
+
 typedef struct target_exists_args {
 	const char	*poolname;
 	uint64_t	poolguid;
@@ -3198,12 +3321,15 @@ zpool_do_checkpoint(int argc, char **argv)
 /*
  * zpool import [-d dir] [-D]
  *       import [-o mntopts] [-o prop=value] ... [-R root] [-D] [-l]
- *              [-d dir | -c cachefile] [-f] -a
+ *              [-d dir | -c cachefile | -s] [-f] -a
  *       import [-o mntopts] [-o prop=value] ... [-R root] [-D] [-l]
- *              [-d dir | -c cachefile] [-f] [-n] [-F] <pool | id> [newpool]
+ *              [-d dir | -c cachefile | -s] [-f] [-n] [-F] <pool | id>
+ *              [newpool]
  *
  *	-c	Read pool information from a cachefile instead of searching
- *		devices.
+ *		devices. If importing from a cachefile config fails, then
+ *		fallback to searching for devices only in the directories that
+ *		exist in the cachefile.
  *
  *	-d	Scan in a specific directory, other than /dev/.  More than
  *		one directory can be specified using multiple '-d' options.
@@ -3259,15 +3385,11 @@ zpool_do_import(int argc, char **argv)
 	boolean_t do_all = B_FALSE;
 	boolean_t do_destroyed = B_FALSE;
 	char *mntopts = NULL;
-	nvpair_t *elem;
-	nvlist_t *config;
 	uint64_t searchguid = 0;
 	char *searchname = NULL;
 	char *propval;
-	nvlist_t *found_config;
 	nvlist_t *policy = NULL;
 	nvlist_t *props = NULL;
-	boolean_t first;
 	int flags = ZFS_IMPORT_NORMAL;
 	uint32_t rewind_policy = ZPOOL_NO_REWIND;
 	boolean_t dryrun = B_FALSE;
@@ -3275,7 +3397,8 @@ zpool_do_import(int argc, char **argv)
 	boolean_t xtreme_rewind = B_FALSE;
 	boolean_t do_scan = B_FALSE;
 	boolean_t pool_exists = B_FALSE;
-	uint64_t pool_state, txg = -1ULL;
+	boolean_t pool_specified = B_FALSE;
+	uint64_t txg = -1ULL;
 	char *cachefile = NULL;
 	importargs_t idata = { 0 };
 	char *endptr;
@@ -3397,6 +3520,11 @@ zpool_do_import(int argc, char **argv)
 		usage(B_FALSE);
 	}
 
+	if (cachefile && do_scan) {
+		(void) fprintf(stderr, gettext("-c is incompatible with -s\n"));
+		usage(B_FALSE);
+	}
+
 	if ((flags & ZFS_IMPORT_LOAD_KEYS) && (flags & ZFS_IMPORT_ONLY)) {
 		(void) fprintf(stderr, gettext("-l is incompatible with -N\n"));
 		usage(B_FALSE);
@@ -3477,7 +3605,7 @@ zpool_do_import(int argc, char **argv)
 			searchname = argv[0];
 			searchguid = 0;
 		}
-		found_config = NULL;
+		pool_specified = B_TRUE;
 
 		/*
 		 * User specified a name or guid.  Ensure it's unique.
@@ -3556,97 +3684,32 @@ zpool_do_import(int argc, char **argv)
 		return (1);
 	}
 
-	/*
+	err = import_pools(pools, props, mntopts, flags, argv[0],
-	 * At this point we have a list of import candidate configs. Even if
+	    argc == 1 ? NULL : argv[1], do_destroyed, pool_specified,
-	 * we were searching by pool name or guid, we still need to
+	    do_all, &idata);
-	 * post-process the list to deal with pool state and possible
-	 * duplicate names.
-	 */
-	err = 0;
-	elem = NULL;
-	first = B_TRUE;
-	while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {
-
-		verify(nvpair_value_nvlist(elem, &config) == 0);
-
-		verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
-		    &pool_state) == 0);
-		if (!do_destroyed && pool_state == POOL_STATE_DESTROYED)
-			continue;
-		if (do_destroyed && pool_state != POOL_STATE_DESTROYED)
-			continue;
-
-		verify(nvlist_add_nvlist(config, ZPOOL_LOAD_POLICY,
-		    policy) == 0);
-
-		if (argc == 0) {
-			if (first)
-				first = B_FALSE;
-			else if (!do_all)
-				(void) printf("\n");
-
-			if (do_all) {
-				err |= do_import(config, NULL, mntopts,
-				    props, flags);
-			} else {
-				show_import(config);
-			}
-		} else if (searchname != NULL) {
-			char *name;
 
 	/*
-			 * We are searching for a pool based on name.
+	 * If we're using the cachefile and we failed to import, then
+	 * fallback to scanning the directory for pools that match
+	 * those in the cachefile.
 	 */
-			verify(nvlist_lookup_string(config,
+	if (err != 0 && cachefile != NULL) {
-			    ZPOOL_CONFIG_POOL_NAME, &name) == 0);
+		(void) printf(gettext("cachefile import failed, retrying\n"));
-
-			if (strcmp(name, searchname) == 0) {
-				if (found_config != NULL) {
-					(void) fprintf(stderr, gettext(
-					    "cannot import '%s': more than "
-					    "one matching pool\n"), searchname);
-					(void) fprintf(stderr, gettext(
-					    "import by numeric ID instead\n"));
-					err = B_TRUE;
-				}
-				found_config = config;
-			}
-		} else {
-			uint64_t guid;
 
 		/*
-			 * Search for a pool by guid.
+		 * We use the scan flag to gather the directories that exist
+		 * in the cachefile. If we need to fallback to searching for
+		 * the pool config, we will only search devices in these
+		 * directories.
 		 */
-			verify(nvlist_lookup_uint64(config,
+		idata.scan = B_TRUE;
-			    ZPOOL_CONFIG_POOL_GUID, &guid) == 0);
+		nvlist_free(pools);
+		pools = zpool_search_import(g_zfs, &idata, &libzfs_config_ops);
 
-			if (guid == searchguid)
+		err = import_pools(pools, props, mntopts, flags, argv[0],
-				found_config = config;
+		    argc == 1 ? NULL : argv[1], do_destroyed, pool_specified,
+		    do_all, &idata);
 	}
-	}
-
-	/*
-	 * If we were searching for a specific pool, verify that we found a
-	 * pool, and then do the import.
-	 */
-	if (argc != 0 && err == 0) {
-		if (found_config == NULL) {
-			(void) fprintf(stderr, gettext("cannot import '%s': "
-			    "no such pool available\n"), argv[0]);
-			err = B_TRUE;
-		} else {
-			err |= do_import(found_config, argc == 1 ? NULL :
-			    argv[1], mntopts, props, flags);
-		}
-	}
-
-	/*
-	 * If we were just looking for pools, report an error if none were
-	 * found.
-	 */
-	if (argc == 0 && first)
-		(void) fprintf(stderr,
-		    gettext("no pools available to import\n"));
 
 error:
 	nvlist_free(props);
@@ -4852,8 +4915,8 @@ get_interval_count(int *argcp, char **argv, float *iv,
 
 		if (*end == '\0' && errno == 0) {
 			if (interval == 0) {
-				(void) fprintf(stderr, gettext("interval "
+				(void) fprintf(stderr, gettext(
-				    "cannot be zero\n"));
+				    "interval cannot be zero\n"));
 				usage(B_FALSE);
 			}
 			/*
@@ -4883,8 +4946,8 @@ get_interval_count(int *argcp, char **argv, float *iv,
 
 		if (*end == '\0' && errno == 0) {
 			if (interval == 0) {
-				(void) fprintf(stderr, gettext("interval "
+				(void) fprintf(stderr, gettext(
-				    "cannot be zero\n"));
+				    "interval cannot be zero\n"));
 				usage(B_FALSE);
 			}
 
@@ -4986,11 +5049,12 @@ get_stat_flags(zpool_list_t *list)
  * Return 1 if cb_data->cb_vdev_names[0] is this vdev's name, 0 otherwise.
  */
 static int
-is_vdev_cb(zpool_handle_t *zhp, nvlist_t *nv, void *cb_data)
+is_vdev_cb(void *zhp_data, nvlist_t *nv, void *cb_data)
 {
 	iostat_cbdata_t *cb = cb_data;
 	char *name = NULL;
 	int ret = 0;
+	zpool_handle_t *zhp = zhp_data;
 
 	name = zpool_vdev_name(g_zfs, zhp, nv, cb->cb_name_flags);
 
@@ -5887,7 +5951,7 @@ print_one_column(zpool_prop_t prop, uint64_t value, const char *str,
 		break;
 	case ZPOOL_PROP_HEALTH:
 		width = 8;
-		snprintf(propval, sizeof (propval), "%-*s", (int)width, str);
+		(void) strlcpy(propval, str, sizeof (propval));
 		break;
 	default:
 		zfs_nicenum_format(value, propval, sizeof (propval), format);
@@ -7735,8 +7799,8 @@ print_removal_status(zpool_handle_t *zhp, pool_removal_stat_t *prs)
 		 * do not print estimated time if hours_left is more than
 		 * 30 days
 		 */
-		(void) printf(gettext("    %s copied out of %s at %s/s, "
+		(void) printf(gettext(
-		    "%.2f%% done"),
+		    "\t%s copied out of %s at %s/s, %.2f%% done"),
 		    examined_buf, total_buf, rate_buf, 100 * fraction_done);
 		if (hours_left < (30 * 24)) {
 			(void) printf(gettext(", %lluh%um to go\n"),
@@ -7751,8 +7815,8 @@ print_removal_status(zpool_handle_t *zhp, pool_removal_stat_t *prs)
 	if (prs->prs_mapping_memory > 0) {
 		char mem_buf[7];
 		zfs_nicenum(prs->prs_mapping_memory, mem_buf, sizeof (mem_buf));
-		(void) printf(gettext("    %s memory used for "
+		(void) printf(gettext(
-		    "removed device mappings\n"),
+		    "\t%s memory used for removed device mappings\n"),
 		    mem_buf);
 	}
 }

cmd/zpool/zpool_util.h

@@ -27,6 +27,7 @@
 
 #include <libnvpair.h>
 #include <libzfs.h>
+#include <libzutil.h>
 
 #ifdef	__cplusplus
 extern "C" {
@@ -67,7 +68,6 @@ int for_each_pool(int, char **, boolean_t unavail, zprop_list_t **,
     boolean_t, zpool_iter_f, void *);
 
 /* Vdev list functions */
-typedef int (*pool_vdev_iter_f)(zpool_handle_t *, nvlist_t *, void *);
 int for_each_vdev(zpool_handle_t *zhp, pool_vdev_iter_f func, void *data);
 
 typedef struct zpool_list zpool_list_t;

cmd/zstream/Makefile.am

@@ -13,3 +13,5 @@ zstream_LDADD = \
 	$(abs_top_builddir)/lib/libzfs/libzfs.la \
 	$(abs_top_builddir)/lib/libzfs_core/libzfs_core.la \
 	$(abs_top_builddir)/lib/libnvpair/libnvpair.la
+
+include $(top_srcdir)/config/CppCheck.am

cmd/zstream/zstream_redup.c

@@ -248,6 +248,7 @@ zfs_redup_stream(int infd, int outfd, boolean_t verbose)
 			fflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
 			fflags &= ~(DMU_BACKUP_FEATURE_DEDUP |
 			    DMU_BACKUP_FEATURE_DEDUPPROPS);
+			/* cppcheck-suppress syntaxError */
 			DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, fflags);
 
 			int sz = drr->drr_payloadlen;

cmd/ztest/Makefile.am

@@ -21,3 +21,5 @@ ztest_LDADD = \
 
 ztest_LDADD += -lm
 ztest_LDFLAGS = -pthread
+
+include $(top_srcdir)/config/CppCheck.am

cmd/ztest/ztest.c

@@ -132,7 +132,7 @@
 #include <libnvpair.h>
 #include <libzutil.h>
 #include <sys/crypto/icp.h>
-#ifdef __GLIBC__
+#if (__GLIBC__ && !__UCLIBC__)
 #include <execinfo.h> /* for backtrace() */
 #endif
 
@@ -556,7 +556,7 @@ dump_debug_buffer(void)
 static void sig_handler(int signo)
 {
 	struct sigaction action;
-#ifdef __GLIBC__ /* backtrace() is a GNU extension */
+#if (__GLIBC__ && !__UCLIBC__) /* backtrace() is a GNU extension */
 	int nptrs;
 	void *buffer[BACKTRACE_SZ];
 
@@ -2163,8 +2163,8 @@ ztest_get_done(zgd_t *zgd, int error)
 }
 
 static int
-ztest_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb,
+ztest_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf,
-    zio_t *zio)
+    struct lwb *lwb, zio_t *zio)
 {
 	ztest_ds_t *zd = arg;
 	objset_t *os = zd->zd_os;

cmd/zvol_id/Makefile.am

@@ -8,3 +8,5 @@ udev_PROGRAMS = zvol_id
 
 zvol_id_SOURCES = \
 	zvol_id_main.c
+
+include $(top_srcdir)/config/CppCheck.am

config/CppCheck.am

@@ -0,0 +1,11 @@
+#
+# Default rules for running cppcheck against the the user space components.
+#
+
+PHONY += cppcheck
+
+CPPCHECKFLAGS  = --std=c99 --quiet --max-configs=1 --error-exitcode=2
+CPPCHECKFLAGS += --inline-suppr -U_KERNEL
+
+cppcheck:
+	$(CPPCHECK) -j$(CPU_COUNT) $(CPPCHECKFLAGS) $(DEFAULT_INCLUDES) $(SOURCES)

config/Rules.am

@@ -3,6 +3,7 @@
 # should include these rules and override or extend them as needed.
 #
 
+PHONY =
 DEFAULT_INCLUDES = \
 	-include $(top_builddir)/zfs_config.h \
 	-I$(top_builddir)/include \
@@ -25,6 +26,7 @@ AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS  = -std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes
 AM_CFLAGS += -fno-strict-aliasing
 AM_CFLAGS += $(NO_OMIT_FRAME_POINTER)
+AM_CFLAGS += $(IMPLICIT_FALLTHROUGH)
 AM_CFLAGS += $(DEBUG_CFLAGS)
 AM_CFLAGS += $(ASAN_CFLAGS)
 AM_CFLAGS += $(CODE_COVERAGE_CFLAGS) $(NO_FORMAT_ZERO_LENGTH)

config/always-compiler-options.m4

@@ -161,6 +161,29 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE], [
 	AC_SUBST([NO_UNUSED_BUT_SET_VARIABLE])
 ])
 
+dnl #
+dnl # Check if gcc supports -Wimplicit-fallthrough option.
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_IMPLICIT_FALLTHROUGH], [
+	AC_MSG_CHECKING([whether $CC supports -Wimplicit-fallthrough])
+
+	saved_flags="$CFLAGS"
+	CFLAGS="$CFLAGS -Werror -Wimplicit-fallthrough"
+
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
+		IMPLICIT_FALLTHROUGH=-Wimplicit-fallthrough
+		AC_DEFINE([HAVE_IMPLICIT_FALLTHROUGH], 1,
+			[Define if compiler supports -Wimplicit-fallthrough])
+		AC_MSG_RESULT([yes])
+	], [
+		IMPLICIT_FALLTHROUGH=
+		AC_MSG_RESULT([no])
+	])
+
+	CFLAGS="$saved_flags"
+	AC_SUBST([IMPLICIT_FALLTHROUGH])
+])
+
 dnl #
 dnl # Check if gcc supports -fno-omit-frame-pointer option.
 dnl #

config/always-cppcheck.m4

@@ -0,0 +1,6 @@
+dnl #
+dnl # Check if cppcheck is available.
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CPPCHECK], [
+	AC_CHECK_PROG([CPPCHECK], [cppcheck], [cppcheck])
+])

config/always-pyzfs.m4

@@ -46,6 +46,21 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_PYZFS], [
 	])
 	AC_SUBST(DEFINE_PYZFS)
 
+	dnl #
+	dnl # Python "packaging" (or, failing that, "distlib") module is required to build and install pyzfs
+	dnl #
+	AS_IF([test "x$enable_pyzfs" = xcheck -o "x$enable_pyzfs" = xyes], [
+		ZFS_AC_PYTHON_MODULE([packaging], [], [
+			ZFS_AC_PYTHON_MODULE([distlib], [], [
+				AS_IF([test "x$enable_pyzfs" = xyes], [
+					AC_MSG_ERROR("Python $PYTHON_VERSION packaging and distlib modules are not installed")
+				], [test "x$enable_pyzfs" != xno], [
+					enable_pyzfs=no
+				])
+			])
+		])
+	])
+
 	dnl #
 	dnl # Require python-devel libraries
 	dnl #

config/ax_count_cpus.m4

@@ -0,0 +1,101 @@
+# ===========================================================================
+#      https://www.gnu.org/software/autoconf-archive/ax_count_cpus.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_COUNT_CPUS([ACTION-IF-DETECTED],[ACTION-IF-NOT-DETECTED])
+#
+# DESCRIPTION
+#
+#   Attempt to count the number of logical processor cores (including
+#   virtual and HT cores) currently available to use on the machine and
+#   place detected value in CPU_COUNT variable.
+#
+#   On successful detection, ACTION-IF-DETECTED is executed if present. If
+#   the detection fails, then ACTION-IF-NOT-DETECTED is triggered. The
+#   default ACTION-IF-NOT-DETECTED is to set CPU_COUNT to 1.
+#
+# LICENSE
+#
+#   Copyright (c) 2014,2016 Karlson2k (Evgeny Grin) <k2k@narod.ru>
+#   Copyright (c) 2012 Brian Aker <brian@tangent.org>
+#   Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net>
+#   Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.net>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 22
+
+  AC_DEFUN([AX_COUNT_CPUS],[dnl
+      AC_REQUIRE([AC_CANONICAL_HOST])dnl
+      AC_REQUIRE([AC_PROG_EGREP])dnl
+      AC_MSG_CHECKING([the number of available CPUs])
+      CPU_COUNT="0"
+
+      # Try generic methods
+
+      # 'getconf' is POSIX utility, but '_NPROCESSORS_ONLN' and
+      # 'NPROCESSORS_ONLN' are platform-specific
+      command -v getconf >/dev/null 2>&1 && \
+        CPU_COUNT=`getconf _NPROCESSORS_ONLN 2>/dev/null || getconf NPROCESSORS_ONLN 2>/dev/null` || CPU_COUNT="0"
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v nproc >/dev/null 2>&1]],[[: # empty]],[dnl
+        # 'nproc' is part of GNU Coreutils and is widely available
+        CPU_COUNT=`OMP_NUM_THREADS='' nproc 2>/dev/null` || CPU_COUNT=`nproc 2>/dev/null` || CPU_COUNT="0"
+      ])dnl
+
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null]],[[: # empty]],[dnl
+        # Try platform-specific preferred methods
+        AS_CASE([[$host_os]],dnl
+          [[*linux*]],[[CPU_COUNT=`lscpu -p 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+,' -c` || CPU_COUNT="0"]],dnl
+          [[*darwin*]],[[CPU_COUNT=`sysctl -n hw.logicalcpu 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[freebsd*]],[[command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n kern.smp.cpus 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[netbsd*]], [[command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n hw.ncpuonline 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[solaris*]],[[command -v psrinfo >/dev/null 2>&1 && CPU_COUNT=`psrinfo 2>/dev/null | $EGREP -e '^@<:@0-9@:>@.*on-line' -c 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[mingw*]],[[CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+/' -c` || CPU_COUNT="0"]],dnl
+          [[msys*]],[[CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+/' -c` || CPU_COUNT="0"]],dnl
+          [[cygwin*]],[[CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+/' -c` || CPU_COUNT="0"]]dnl
+        )dnl
+      ])dnl
+
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v sysctl >/dev/null 2>&1]],[[: # empty]],[dnl
+        # Try less preferred generic method
+        # 'hw.ncpu' exist on many platforms, but not on GNU/Linux
+        CPU_COUNT=`sysctl -n hw.ncpu 2>/dev/null` || CPU_COUNT="0"
+      ])dnl
+
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null]],[[: # empty]],[dnl
+      # Try platform-specific fallback methods
+      # They can be less accurate and slower then preferred methods
+        AS_CASE([[$host_os]],dnl
+          [[*linux*]],[[CPU_COUNT=`$EGREP -e '^processor' -c /proc/cpuinfo 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[*darwin*]],[[CPU_COUNT=`system_profiler SPHardwareDataType 2>/dev/null | $EGREP -i -e 'number of cores:'|cut -d : -f 2 -s|tr -d ' '` || CPU_COUNT="0"]],dnl
+          [[freebsd*]],[[CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu@<:@0-9@:>@+: '|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0"]],dnl
+          [[netbsd*]], [[CPU_COUNT=`command -v cpuctl >/dev/null 2>&1 && cpuctl list 2>/dev/null| $EGREP -e '^@<:@0-9@:>@+ .* online ' -c` || \
+                           CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu@<:@0-9@:>@+ at'|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0"]],dnl
+          [[solaris*]],[[command -v kstat >/dev/null 2>&1 && CPU_COUNT=`kstat -m cpu_info -s state -p 2>/dev/null | $EGREP -c -e 'on-line'` || \
+                           CPU_COUNT=`kstat -m cpu_info 2>/dev/null | $EGREP -c -e 'module: cpu_info'` || CPU_COUNT="0"]],dnl
+          [[mingw*]],[AS_IF([[CPU_COUNT=`reg query 'HKLM\\Hardware\\Description\\System\\CentralProcessor' 2>/dev/null | $EGREP -e '\\\\@<:@0-9@:>@+$' -c`]],dnl
+                        [[: # empty]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]])],dnl
+          [[msys*]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]],dnl
+          [[cygwin*]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]]dnl
+        )dnl
+      ])dnl
+
+      AS_IF([[test "x$CPU_COUNT" != "x0" && test "$CPU_COUNT" -gt 0 2>/dev/null]],[dnl
+          AC_MSG_RESULT([[$CPU_COUNT]])
+          m4_ifvaln([$1],[$1],)dnl
+        ],[dnl
+          m4_ifval([$2],[dnl
+            AS_UNSET([[CPU_COUNT]])
+            AC_MSG_RESULT([[unable to detect]])
+            $2
+          ], [dnl
+            CPU_COUNT="1"
+            AC_MSG_RESULT([[unable to detect (assuming 1)]])
+          ])dnl
+        ])dnl
+      ])dnl

config/ax_python_devel.m4

@@ -97,9 +97,18 @@ AC_DEFUN([AX_PYTHON_DEVEL],[
 	# Check for a version of Python >= 2.1.0
 	#
 	AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
-	ac_supports_python_ver=`$PYTHON -c "import sys; \
+	ac_supports_python_ver=`cat<<EOD | $PYTHON -
-		ver = sys.version.split ()[[0]]; \
+from __future__ import print_function;
-		print (ver >= '2.1.0')"`
+import sys;
+try:
+	from packaging import version;
+except ImportError:
+	from distlib import version;
+ver = sys.version.split ()[[0]];
+(tst_cmp, tst_ver) = ">= '2.1.0'".split ();
+tst_ver = tst_ver.strip ("'");
+eval ("print (version.LegacyVersion (ver)"+ tst_cmp +"version.LegacyVersion (tst_ver))")
+EOD`
 	if test "$ac_supports_python_ver" != "True"; then
 		if test -z "$PYTHON_NOVERSIONCHECK"; then
 			AC_MSG_RESULT([no])
@@ -126,9 +135,21 @@ to something else than an empty string.
 	#
 	if test -n "$1"; then
 		AC_MSG_CHECKING([for a version of Python $1])
-		ac_supports_python_ver=`$PYTHON -c "import sys; \
+		# Why the strip ()?  Because if we don't, version.parse
-			ver = sys.version.split ()[[0]]; \
+		# will, for example, report 3.10.0 >= '3.11.0'
-			print (ver $1)"`
+		ac_supports_python_ver=`cat<<EOD | $PYTHON -
+
+from __future__ import print_function;
+import sys;
+try:
+	from packaging import version;
+except ImportError:
+	from distlib import version;
+ver = sys.version.split ()[[0]];
+(tst_cmp, tst_ver) = "$1".split ();
+tst_ver = tst_ver.strip ("'");
+eval ("print (version.LegacyVersion (ver)"+ tst_cmp +"version.LegacyVersion (tst_ver))")
+EOD`
 		if test "$ac_supports_python_ver" = "True"; then
 		   AC_MSG_RESULT([yes])
 		else

config/kernel-acl.m4

@@ -162,6 +162,9 @@ dnl #
 dnl # 3.1 API change,
 dnl # Check if inode_operations contains the function get_acl
 dnl #
+dnl # 5.15 API change,
+dnl # Added the bool rcu argument to get_acl for rcu path walk.
+dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_GET_ACL], [
 	ZFS_LINUX_TEST_SRC([inode_operations_get_acl], [
 		#include <linux/fs.h>
@@ -174,22 +177,55 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_GET_ACL], [
 			.get_acl = get_acl_fn,
 		};
 	],[])
+
+	ZFS_LINUX_TEST_SRC([inode_operations_get_acl_rcu], [
+		#include <linux/fs.h>
+
+		struct posix_acl *get_acl_fn(struct inode *inode, int type,
+		    bool rcu) { return NULL; }
+
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.get_acl = get_acl_fn,
+		};
+	],[])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL], [
 	AC_MSG_CHECKING([whether iops->get_acl() exists])
 	ZFS_LINUX_TEST_RESULT([inode_operations_get_acl], [
 		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_GET_ACL, 1, [iops->get_acl() exists])
+	],[
+		ZFS_LINUX_TEST_RESULT([inode_operations_get_acl_rcu], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_GET_ACL_RCU, 1, [iops->get_acl() takes rcu])
 		],[
 			ZFS_LINUX_TEST_ERROR([iops->get_acl()])
 		])
+	])
 ])
 
 dnl #
 dnl # 3.14 API change,
 dnl # Check if inode_operations contains the function set_acl
 dnl #
+dnl # 5.12 API change,
+dnl # set_acl() added a user_namespace* parameter first
+dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_SET_ACL], [
+	ZFS_LINUX_TEST_SRC([inode_operations_set_acl_userns], [
+		#include <linux/fs.h>
+
+		int set_acl_fn(struct user_namespace *userns,
+		    struct inode *inode, struct posix_acl *acl,
+		    int type) { return 0; }
+
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.set_acl = set_acl_fn,
+		};
+	],[])
 	ZFS_LINUX_TEST_SRC([inode_operations_set_acl], [
 		#include <linux/fs.h>
 
@@ -205,12 +241,18 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_SET_ACL], [
 
 AC_DEFUN([ZFS_AC_KERNEL_INODE_OPERATIONS_SET_ACL], [
 	AC_MSG_CHECKING([whether iops->set_acl() exists])
-	ZFS_LINUX_TEST_RESULT([inode_operations_set_acl], [
+	ZFS_LINUX_TEST_RESULT([inode_operations_set_acl_userns], [
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_SET_ACL, 1, [iops->set_acl() exists])
+		AC_DEFINE(HAVE_SET_ACL_USERNS, 1, [iops->set_acl() takes 4 args])
+	],[
+		ZFS_LINUX_TEST_RESULT([inode_operations_set_acl], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_SET_ACL, 1, [iops->set_acl() exists, takes 3 args])
 		],[
 			AC_MSG_RESULT(no)
 		])
+	])
 ])
 
 dnl #

config/kernel-bio.m4

@@ -191,6 +191,24 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_SET_DEV], [
 	], [], [ZFS_META_LICENSE])
 ])
 
+dnl #
+dnl # Linux 5.16 API
+dnl #
+dnl # bio_set_dev is no longer a helper macro and is now an inline function,
+dnl # meaning that the function it calls internally can no longer be overridden
+dnl # by our code
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_SET_DEV_MACRO], [
+	ZFS_LINUX_TEST_SRC([bio_set_dev_macro], [
+		#include <linux/bio.h>
+		#include <linux/fs.h>
+	],[
+		#ifndef bio_set_dev
+		#error Not a macro
+		#endif
+	], [], [ZFS_META_LICENSE])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV], [
 	AC_MSG_CHECKING([whether bio_set_dev() is available])
 	ZFS_LINUX_TEST_RESULT([bio_set_dev], [
@@ -205,6 +223,15 @@ AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV], [
 			AC_DEFINE(HAVE_BIO_SET_DEV_GPL_ONLY, 1,
 			    [bio_set_dev() GPL-only])
 		])
+
+		AC_MSG_CHECKING([whether bio_set_dev() is a macro])
+		ZFS_LINUX_TEST_RESULT([bio_set_dev_macro], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_BIO_SET_DEV_MACRO, 1,
+			    [bio_set_dev() is a macro])
+		],[
+			AC_MSG_RESULT(no)
+		])
 	],[
 		AC_MSG_RESULT(no)
 	])
@@ -294,9 +321,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_SUBMIT_BIO], [
 	ZFS_LINUX_TEST_SRC([submit_bio], [
 		#include <linux/bio.h>
 	],[
-		blk_qc_t blk_qc;
 		struct bio *bio = NULL;
-		blk_qc = submit_bio(bio);
+		(void) submit_bio(bio);
 	])
 ])
 
@@ -369,6 +395,85 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKG_TRYGET], [
 	])
 ])
 
+dnl #
+dnl # Linux 5.12 API,
+dnl #
+dnl # The Linux 5.12 kernel updated struct bio to create a new bi_bdev member
+dnl # and bio->bi_disk was moved to bio->bi_bdev->bd_disk
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_BDEV_DISK], [
+	ZFS_LINUX_TEST_SRC([bio_bdev_disk], [
+		#include <linux/blk_types.h>
+		#include <linux/blkdev.h>
+	],[
+		struct bio *b = NULL;
+		struct gendisk *d = b->bi_bdev->bd_disk;
+		blk_register_queue(d);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BIO_BDEV_DISK], [
+	AC_MSG_CHECKING([whether bio->bi_bdev->bd_disk exists])
+	ZFS_LINUX_TEST_RESULT([bio_bdev_disk], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BIO_BDEV_DISK, 1, [bio->bi_bdev->bd_disk exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
+dnl #
+dnl # Linux 5.16 API
+dnl #
+dnl # The Linux 5.16 API for submit_bio changed the return type to be
+dnl # void instead of int
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BDEV_SUBMIT_BIO_RETURNS_VOID], [
+	ZFS_LINUX_TEST_SRC([bio_bdev_submit_bio_void], [
+		#include <linux/blkdev.h>
+	],[
+		struct block_device_operations *bdev = NULL;
+		__attribute__((unused)) void(*f)(struct bio *) = bdev->submit_bio;
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BDEV_SUBMIT_BIO_RETURNS_VOID], [
+	AC_MSG_CHECKING(
+		[whether block_device_operations->submit_bio() returns void])
+	ZFS_LINUX_TEST_RESULT([bio_bdev_submit_bio_void], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BDEV_SUBMIT_BIO_RETURNS_VOID, 1,
+			[block_device_operations->submit_bio() returns void])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
+dnl #
+dnl # Linux 5.16 API
+dnl #
+dnl # The Linux 5.16 API moved struct blkcg_gq into linux/blk-cgroup.h, which
+dnl # has been around since 2015. This test looks for the presence of that
+dnl # header, so that it can be conditionally included where it exists, but
+dnl # still be backward compatible with kernels that pre-date its introduction.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_CGROUP_HEADER], [
+	ZFS_LINUX_TEST_SRC([blk_cgroup_header], [
+		#include <linux/blk-cgroup.h>
+	], [])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLK_CGROUP_HEADER], [
+	AC_MSG_CHECKING([for existence of linux/blk-cgroup.h])
+	ZFS_LINUX_TEST_RESULT([blk_cgroup_header],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_LINUX_BLK_CGROUP_HEADER, 1,
+			[linux/blk-cgroup.h exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO], [
 	ZFS_AC_KERNEL_SRC_REQ
 	ZFS_AC_KERNEL_SRC_BIO_OPS
@@ -379,6 +484,10 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO], [
 	ZFS_AC_KERNEL_SRC_BIO_SUBMIT_BIO
 	ZFS_AC_KERNEL_SRC_BIO_CURRENT_BIO_LIST
 	ZFS_AC_KERNEL_SRC_BLKG_TRYGET
+	ZFS_AC_KERNEL_SRC_BIO_BDEV_DISK
+	ZFS_AC_KERNEL_SRC_BDEV_SUBMIT_BIO_RETURNS_VOID
+	ZFS_AC_KERNEL_SRC_BIO_SET_DEV_MACRO
+	ZFS_AC_KERNEL_SRC_BLK_CGROUP_HEADER
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_BIO], [
@@ -400,4 +509,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BIO], [
 	ZFS_AC_KERNEL_BIO_SUBMIT_BIO
 	ZFS_AC_KERNEL_BIO_CURRENT_BIO_LIST
 	ZFS_AC_KERNEL_BLKG_TRYGET
+	ZFS_AC_KERNEL_BIO_BDEV_DISK
+	ZFS_AC_KERNEL_BDEV_SUBMIT_BIO_RETURNS_VOID
+	ZFS_AC_KERNEL_BLK_CGROUP_HEADER
 ])

config/kernel-bio_max_segs.m4

@@ -0,0 +1,23 @@
+dnl #
+dnl # 5.12 API change removes BIO_MAX_PAGES in favor of bio_max_segs()
+dnl # which will handle the logic of setting the upper-bound to a
+dnl # BIO_MAX_PAGES, internally.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_MAX_SEGS], [
+	ZFS_LINUX_TEST_SRC([bio_max_segs], [
+		#include <linux/bio.h>
+	],[
+		bio_max_segs(1);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BIO_MAX_SEGS], [
+	AC_MSG_CHECKING([whether bio_max_segs() exists])
+	ZFS_LINUX_TEST_RESULT([bio_max_segs], [
+		AC_MSG_RESULT(yes)
+
+		AC_DEFINE([HAVE_BIO_MAX_SEGS], 1, [bio_max_segs() is implemented])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-blk-queue.m4

@@ -48,7 +48,45 @@ AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_BDI], [
 ])
 
 dnl #
-dnl # 2.6.32 - 4.x API,
+dnl # 5.9: added blk_queue_update_readahead(),
+dnl # 5.15: renamed to disk_update_readahead()
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_UPDATE_READAHEAD], [
+	ZFS_LINUX_TEST_SRC([blk_queue_update_readahead], [
+		#include <linux/blkdev.h>
+	],[
+		struct request_queue q;
+		blk_queue_update_readahead(&q);
+	])
+
+	ZFS_LINUX_TEST_SRC([disk_update_readahead], [
+		#include <linux/blkdev.h>
+	],[
+		struct gendisk disk;
+		disk_update_readahead(&disk);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_UPDATE_READAHEAD], [
+	AC_MSG_CHECKING([whether blk_queue_update_readahead() exists])
+	ZFS_LINUX_TEST_RESULT([blk_queue_update_readahead], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_QUEUE_UPDATE_READAHEAD, 1,
+		    [blk_queue_update_readahead() exists])
+	],[
+		AC_MSG_CHECKING([whether disk_update_readahead() exists])
+		ZFS_LINUX_TEST_RESULT([disk_update_readahead], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_DISK_UPDATE_READAHEAD, 1,
+			    [disk_update_readahead() exists])
+		],[
+			AC_MSG_RESULT(no)
+		])
+	])
+])
+
+dnl #
+dnl # 2.6.32 API,
 dnl #   blk_queue_discard()
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_DISCARD], [
@@ -280,6 +318,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS], [
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE], [
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_PLUG
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_BDI
+	ZFS_AC_KERNEL_SRC_BLK_QUEUE_UPDATE_READAHEAD
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_DISCARD
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_SECURE_ERASE
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLAG_SET
@@ -292,6 +331,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE], [
 AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE], [
 	ZFS_AC_KERNEL_BLK_QUEUE_PLUG
 	ZFS_AC_KERNEL_BLK_QUEUE_BDI
+	ZFS_AC_KERNEL_BLK_QUEUE_UPDATE_READAHEAD
 	ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
 	ZFS_AC_KERNEL_BLK_QUEUE_SECURE_ERASE
 	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET

config/kernel-blkdev.m4

@@ -294,6 +294,27 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_WHOLE], [
 	])
 ])
 
+dnl #
+dnl # 5.13 API change
+dnl # blkdev_get_by_path() no longer handles ERESTARTSYS
+dnl #
+dnl # Unfortunately we're forced to rely solely on the kernel version
+dnl # number in order to determine the expected behavior.  This was an
+dnl # internal change to blkdev_get_by_dev(), see commit a8ed1a0607.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_ERESTARTSYS], [
+	AC_MSG_CHECKING([whether blkdev_get_by_path() handles ERESTARTSYS])
+	AS_VERSION_COMPARE([$LINUX_VERSION], [5.13.0], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLKDEV_GET_ERESTARTSYS, 1,
+			[blkdev_get_by_path() handles ERESTARTSYS])
+	],[
+		AC_MSG_RESULT(no)
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
 	ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH
 	ZFS_AC_KERNEL_SRC_BLKDEV_PUT
@@ -318,4 +339,5 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
 	ZFS_AC_KERNEL_BLKDEV_CHECK_DISK_CHANGE
 	ZFS_AC_KERNEL_BLKDEV_BDEV_CHECK_MEDIA_CHANGE
 	ZFS_AC_KERNEL_BLKDEV_BDEV_WHOLE
+	ZFS_AC_KERNEL_BLKDEV_GET_ERESTARTSYS
 ])

config/kernel-block-device-operations.m4

@@ -52,12 +52,44 @@ AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
 	])
 ])
 
+dnl #
+dnl # 5.13 API change
+dnl # block_device_operations->revalidate_disk() was removed
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK], [
+	ZFS_LINUX_TEST_SRC([block_device_operations_revalidate_disk], [
+		#include <linux/blkdev.h>
+
+		int blk_revalidate_disk(struct gendisk *disk) {
+			return(0);
+		}
+
+		static const struct block_device_operations
+		    bops __attribute__ ((unused)) = {
+			.revalidate_disk	= blk_revalidate_disk,
+		};
+	], [], [$NO_UNUSED_BUT_SET_VARIABLE])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK], [
+	AC_MSG_CHECKING([whether bops->revalidate_disk() exists])
+	ZFS_LINUX_TEST_RESULT([block_device_operations_revalidate_disk], [
+		AC_DEFINE([HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK], [1],
+			[Define if revalidate_disk() in block_device_operations])
+		AC_MSG_RESULT(yes)
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS], [
 	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
 	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
+	ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS], [
 	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
 	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
+	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
 ])

config/kernel-fpu.m4

@@ -2,6 +2,9 @@ dnl #
 dnl # Handle differences in kernel FPU code.
 dnl #
 dnl # Kernel
+dnl # 5.16:	XCR code put into asm/fpu/xcr.h
+dnl # 		HAVE_KERNEL_FPU_XCR_HEADER
+dnl #
 dnl # 5.0:	Wrappers have been introduced to save/restore the FPU state.
 dnl #		This change was made to the 4.19.38 and 4.14.120 LTS kernels.
 dnl #		HAVE_KERNEL_FPU_INTERNAL
@@ -25,6 +28,18 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU_HEADER], [
 		AC_DEFINE(HAVE_KERNEL_FPU_API_HEADER, 1,
 		    [kernel has asm/fpu/api.h])
 		AC_MSG_RESULT(asm/fpu/api.h)
+		AC_MSG_CHECKING([whether fpu/xcr header is available])
+		ZFS_LINUX_TRY_COMPILE([
+			#include <linux/module.h>
+			#include <asm/fpu/xcr.h>
+		],[
+		],[
+			AC_DEFINE(HAVE_KERNEL_FPU_XCR_HEADER, 1,
+				[kernel has asm/fpu/xcr.h])
+			AC_MSG_RESULT(asm/fpu/xcr.h)
+		],[
+			AC_MSG_RESULT(no asm/fpu/xcr.h)
+		])
 	],[
 		AC_MSG_RESULT(i387.h & xcr.h)
 	])

config/kernel-generic_fillattr.m4

@@ -0,0 +1,28 @@
+dnl #
+dnl # 5.12 API
+dnl #
+dnl # generic_fillattr in linux/fs.h now requires a struct user_namespace*
+dnl # as the first arg, to support idmapped mounts.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_GENERIC_FILLATTR_USERNS], [
+	ZFS_LINUX_TEST_SRC([generic_fillattr_userns], [
+		#include <linux/fs.h>
+	],[
+		struct user_namespace *userns = NULL;
+		struct inode *in = NULL;
+		struct kstat *k = NULL;
+		generic_fillattr(userns, in, k);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_GENERIC_FILLATTR_USERNS], [
+	AC_MSG_CHECKING([whether generic_fillattr requres struct user_namespace*])
+	ZFS_LINUX_TEST_RESULT([generic_fillattr_userns], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_GENERIC_FILLATTR_USERNS, 1,
+		    [generic_fillattr requires struct user_namespace*])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
+

config/kernel-generic_io_acct.m4

@@ -2,6 +2,17 @@ dnl #
 dnl # Check for generic io accounting interface.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_GENERIC_IO_ACCT], [
+	ZFS_LINUX_TEST_SRC([disk_io_acct], [
+		#include <linux/blkdev.h>
+	], [
+		struct gendisk *disk = NULL;
+		struct bio *bio = NULL;
+		unsigned long start_time;
+
+		start_time = disk_start_io_acct(disk, bio_sectors(bio), bio_op(bio));
+		disk_end_io_acct(disk, bio_op(bio), start_time);
+	])
+
 	ZFS_LINUX_TEST_SRC([bio_io_acct], [
 		#include <linux/blkdev.h>
 	], [
@@ -38,6 +49,19 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_GENERIC_IO_ACCT], [
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_GENERIC_IO_ACCT], [
+	dnl #
+	dnl # 5.12 API,
+	dnl #
+	dnl # bio_start_io_acct() and bio_end_io_acct() became GPL-exported
+	dnl # so use disk_start_io_acct() and disk_end_io_acct() instead
+	dnl #
+	AC_MSG_CHECKING([whether generic disk_*_io_acct() are available])
+	ZFS_LINUX_TEST_RESULT([disk_io_acct], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_DISK_IO_ACCT, 1, [disk_*_io_acct() available])
+	], [
+		AC_MSG_RESULT(no)
+
 		dnl #
 		dnl # 5.7 API,
 		dnl #
@@ -84,4 +108,5 @@ AC_DEFUN([ZFS_AC_KERNEL_GENERIC_IO_ACCT], [
 				])
 			])
 		])
+	])
 ])

config/kernel-inode-create.m4

@@ -1,7 +1,25 @@
-dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_CREATE], [
-dnl # 3.6 API change
+	dnl #
-dnl #
+	dnl # 5.12 API change that added the struct user_namespace* arg
-AC_DEFUN([ZFS_AC_KERNEL_SRC_CREATE_FLAGS], [
+	dnl # to the front of this function type's arg list.
+	dnl #
+	ZFS_LINUX_TEST_SRC([create_userns], [
+		#include <linux/fs.h>
+		#include <linux/sched.h>
+
+		int inode_create(struct user_namespace *userns,
+		    struct inode *inode ,struct dentry *dentry,
+		    umode_t umode, bool flag) { return 0; }
+
+		static const struct inode_operations
+			iops __attribute__ ((unused)) = {
+			.create		= inode_create,
+		};
+	],[])
+
+	dnl #
+	dnl # 3.6 API change
+	dnl #
 	ZFS_LINUX_TEST_SRC([create_flags], [
 		#include <linux/fs.h>
 		#include <linux/sched.h>
@@ -16,11 +34,20 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_CREATE_FLAGS], [
 	],[])
 ])
 
-AC_DEFUN([ZFS_AC_KERNEL_CREATE_FLAGS], [
+AC_DEFUN([ZFS_AC_KERNEL_CREATE], [
+	AC_MSG_CHECKING([whether iops->create() takes struct user_namespace*])
+	ZFS_LINUX_TEST_RESULT([create_userns], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_IOPS_CREATE_USERNS, 1,
+		   [iops->create() takes struct user_namespace*])
+	],[
+		AC_MSG_RESULT(no)
+
 		AC_MSG_CHECKING([whether iops->create() passes flags])
 		ZFS_LINUX_TEST_RESULT([create_flags], [
 			AC_MSG_RESULT(yes)
 		],[
 			ZFS_LINUX_TEST_ERROR([iops->create()])
 		])
+	])
 ])

config/kernel-inode-getattr.m4

@@ -1,8 +1,29 @@
-dnl #
-dnl # Linux 4.11 API
-dnl # See torvalds/linux@a528d35
-dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_GETATTR], [
+	dnl #
+	dnl # Linux 5.12 API
+	dnl # The getattr I/O operations handler type was extended to require
+	dnl # a struct user_namespace* as its first arg, to support idmapped
+	dnl # mounts.
+	dnl #
+	ZFS_LINUX_TEST_SRC([inode_operations_getattr_userns], [
+		#include <linux/fs.h>
+
+		int test_getattr(
+			struct user_namespace *userns,
+		    const struct path *p, struct kstat *k,
+		    u32 request_mask, unsigned int query_flags)
+		    { return 0; }
+
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.getattr = test_getattr,
+		};
+	],[])
+
+	dnl #
+	dnl # Linux 4.11 API
+	dnl # See torvalds/linux@a528d35
+	dnl #
 	ZFS_LINUX_TEST_SRC([inode_operations_getattr_path], [
 		#include <linux/fs.h>
 
@@ -33,6 +54,20 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_GETATTR], [
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_INODE_GETATTR], [
+	dnl #
+	dnl # Kernel 5.12 test
+	dnl #
+	AC_MSG_CHECKING([whether iops->getattr() takes user_namespace])
+	ZFS_LINUX_TEST_RESULT([inode_operations_getattr_userns], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_USERNS_IOPS_GETATTR, 1,
+		    [iops->getattr() takes struct user_namespace*])
+	],[
+		AC_MSG_RESULT(no)
+
+		dnl #
+		dnl # Kernel 4.11 test
+		dnl #
 		AC_MSG_CHECKING([whether iops->getattr() takes a path])
 		ZFS_LINUX_TEST_RESULT([inode_operations_getattr_path], [
 			AC_MSG_RESULT(yes)
@@ -41,6 +76,9 @@ AC_DEFUN([ZFS_AC_KERNEL_INODE_GETATTR], [
 		],[
 			AC_MSG_RESULT(no)
 
+			dnl #
+			dnl # Kernel < 4.11 test
+			dnl #
 			AC_MSG_CHECKING([whether iops->getattr() takes a vfsmount])
 			ZFS_LINUX_TEST_RESULT([inode_operations_getattr_vfsmount], [
 				AC_MSG_RESULT(yes)
@@ -50,4 +88,5 @@ AC_DEFUN([ZFS_AC_KERNEL_INODE_GETATTR], [
 				AC_MSG_RESULT(no)
 			])
 		])
+	])
 ])

config/kernel-is_owner_or_cap.m4

@@ -11,13 +11,32 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_INODE_OWNER_OR_CAPABLE], [
 		struct inode *ip = NULL;
 		(void) inode_owner_or_capable(ip);
 	])
+
+	ZFS_LINUX_TEST_SRC([inode_owner_or_capable_idmapped], [
+		#include <linux/fs.h>
+	],[
+		struct inode *ip = NULL;
+		(void) inode_owner_or_capable(&init_user_ns, ip);
+	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE], [
 	AC_MSG_CHECKING([whether inode_owner_or_capable() exists])
 	ZFS_LINUX_TEST_RESULT([inode_owner_or_capable], [
 		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_INODE_OWNER_OR_CAPABLE, 1,
+		    [inode_owner_or_capable() exists])
+	], [
+		AC_MSG_RESULT(no)
+
+		AC_MSG_CHECKING(
+		    [whether inode_owner_or_capable() takes user_ns])
+		ZFS_LINUX_TEST_RESULT([inode_owner_or_capable_idmapped], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_INODE_OWNER_OR_CAPABLE_IDMAPPED, 1,
+			    [inode_owner_or_capable() takes user_ns])
 		],[
 			ZFS_LINUX_TEST_ERROR([capability])
 		])
+	])
 ])

config/kernel-make-request-fn.m4

@@ -42,6 +42,13 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN], [
 		struct block_device_operations o;
 		o.submit_bio = NULL;
 	])
+
+	ZFS_LINUX_TEST_SRC([blk_alloc_disk], [
+		#include <linux/blkdev.h>
+	],[
+		struct gendisk *disk  __attribute__ ((unused));
+		disk = blk_alloc_disk(NUMA_NO_NODE);
+	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
@@ -56,6 +63,19 @@ AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
 
 		AC_DEFINE(HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS, 1,
 		    [submit_bio is member of struct block_device_operations])
+
+		dnl #
+		dnl # Linux 5.14 API Change:
+		dnl # blk_alloc_queue() + alloc_disk() combo replaced by
+		dnl # a single call to blk_alloc_disk().
+		dnl #
+		AC_MSG_CHECKING([whether blk_alloc_disk() exists])
+		ZFS_LINUX_TEST_RESULT([blk_alloc_disk], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE([HAVE_BLK_ALLOC_DISK], 1, [blk_alloc_disk() exists])
+		], [
+			AC_MSG_RESULT(no)
+		])
 	],[
 		AC_MSG_RESULT(no)
 

config/kernel-mkdir-umode-t.m4

@@ -1,32 +0,0 @@
-dnl #
-dnl # 3.3 API change
-dnl # The VFS .create, .mkdir and .mknod callbacks were updated to take a
-dnl # umode_t type rather than an int.  The expectation is that any backport
-dnl # would also change all three prototypes.  However, if it turns out that
-dnl # some distribution doesn't backport the whole thing this could be
-dnl # broken apart into three separate checks.
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_SRC_MKDIR_UMODE_T], [
-	ZFS_LINUX_TEST_SRC([inode_operations_mkdir], [
-		#include <linux/fs.h>
-
-		int mkdir(struct inode *inode, struct dentry *dentry,
-		    umode_t umode) { return 0; }
-
-		static const struct inode_operations
-		    iops __attribute__ ((unused)) = {
-			.mkdir = mkdir,
-		};
-	],[])
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_MKDIR_UMODE_T], [
-	AC_MSG_CHECKING([whether iops->create()/mkdir()/mknod() take umode_t])
-	ZFS_LINUX_TEST_RESULT([inode_operations_mkdir], [
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_MKDIR_UMODE_T, 1,
-		    [iops->create()/mkdir()/mknod() take umode_t])
-	],[
-		ZFS_LINUX_TEST_ERROR([mkdir()])
-	])
-])

config/kernel-mkdir.m4

@@ -0,0 +1,65 @@
+dnl #
+dnl # Supported mkdir() interfaces checked newest to oldest.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_MKDIR], [
+	dnl #
+	dnl # 5.12 API change
+	dnl # The struct user_namespace arg was added as the first argument to
+	dnl # mkdir()
+	dnl #
+	ZFS_LINUX_TEST_SRC([mkdir_user_namespace], [
+		#include <linux/fs.h>
+
+		int mkdir(struct user_namespace *userns,
+			struct inode *inode, struct dentry *dentry,
+		    umode_t umode) { return 0; }
+
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.mkdir = mkdir,
+		};
+	],[])
+
+	dnl #
+	dnl # 3.3 API change
+	dnl # The VFS .create, .mkdir and .mknod callbacks were updated to take a
+	dnl # umode_t type rather than an int.  The expectation is that any backport
+	dnl # would also change all three prototypes.  However, if it turns out that
+	dnl # some distribution doesn't backport the whole thing this could be
+	dnl # broken apart into three separate checks.
+	dnl #
+	ZFS_LINUX_TEST_SRC([inode_operations_mkdir], [
+		#include <linux/fs.h>
+
+		int mkdir(struct inode *inode, struct dentry *dentry,
+		    umode_t umode) { return 0; }
+
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.mkdir = mkdir,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_MKDIR], [
+	dnl #
+	dnl # 5.12 API change
+	dnl # The struct user_namespace arg was added as the first argument to
+	dnl # mkdir() of the iops structure.
+	dnl #
+	AC_MSG_CHECKING([whether iops->mkdir() takes struct user_namespace*])
+	ZFS_LINUX_TEST_RESULT([mkdir_user_namespace], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_IOPS_MKDIR_USERNS, 1,
+		    [iops->mkdir() takes struct user_namespace*])
+	],[
+		AC_MSG_CHECKING([whether iops->mkdir() takes umode_t])
+		ZFS_LINUX_TEST_RESULT([inode_operations_mkdir], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_MKDIR_UMODE_T, 1,
+			    [iops->mkdir() takes umode_t])
+		],[
+			ZFS_LINUX_TEST_ERROR([mkdir()])
+		])
+	])
+])

config/kernel-mknod.m4

@@ -0,0 +1,30 @@
+AC_DEFUN([ZFS_AC_KERNEL_SRC_MKNOD], [
+	dnl #
+	dnl # 5.12 API change that added the struct user_namespace* arg
+	dnl # to the front of this function type's arg list.
+	dnl #
+	ZFS_LINUX_TEST_SRC([mknod_userns], [
+		#include <linux/fs.h>
+		#include <linux/sched.h>
+
+		int tmp_mknod(struct user_namespace *userns,
+		    struct inode *inode ,struct dentry *dentry,
+		    umode_t u, dev_t d) { return 0; }
+
+		static const struct inode_operations
+			iops __attribute__ ((unused)) = {
+			.mknod		= tmp_mknod,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_MKNOD], [
+	AC_MSG_CHECKING([whether iops->mknod() takes struct user_namespace*])
+	ZFS_LINUX_TEST_RESULT([mknod_userns], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_IOPS_MKNOD_USERNS, 1,
+		    [iops->mknod() takes struct user_namespace*])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-pagemap-folio_wait_bit.m4

@@ -0,0 +1,26 @@
+dnl #
+dnl # Linux 5.16 no longer allows directly calling wait_on_page_bit, and
+dnl # instead requires you to call folio-specific functions. In this case,
+dnl # wait_on_page_bit(pg, PG_writeback) becomes
+dnl # folio_wait_bit(pg, PG_writeback)
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_PAGEMAP_FOLIO_WAIT_BIT], [
+	ZFS_LINUX_TEST_SRC([pagemap_has_folio_wait_bit], [
+		#include <linux/pagemap.h>
+	],[
+		static struct folio *f = NULL;
+
+		folio_wait_bit(f, PG_writeback);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT], [
+	AC_MSG_CHECKING([folio_wait_bit() exists])
+	ZFS_LINUX_TEST_RESULT([pagemap_has_folio_wait_bit], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_PAGEMAP_FOLIO_WAIT_BIT, 1,
+			[folio_wait_bit() exists])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])

config/kernel-rename.m4

@@ -1,10 +1,10 @@
-dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_RENAME], [
-dnl # 4.9 API change,
+	dnl #
-dnl # iops->rename2() merged into iops->rename(), and iops->rename() now wants
+	dnl # 4.9 API change,
-dnl # flags.
+	dnl # iops->rename2() merged into iops->rename(), and iops->rename() now wants
-dnl #
+	dnl # flags.
-AC_DEFUN([ZFS_AC_KERNEL_SRC_RENAME_WANTS_FLAGS], [
+	dnl #
-	ZFS_LINUX_TEST_SRC([inode_operations_rename], [
+	ZFS_LINUX_TEST_SRC([inode_operations_rename_flags], [
 		#include <linux/fs.h>
 		int rename_fn(struct inode *sip, struct dentry *sdp,
 			struct inode *tip, struct dentry *tdp,
@@ -15,15 +15,41 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_RENAME_WANTS_FLAGS], [
 			.rename = rename_fn,
 		};
 	],[])
+
+	dnl #
+	dnl # 5.12 API change,
+	dnl #
+	dnl # Linux 5.12 introduced passing struct user_namespace* as the first argument
+	dnl # of the rename() and other inode_operations members.
+	dnl #
+	ZFS_LINUX_TEST_SRC([inode_operations_rename_userns], [
+		#include <linux/fs.h>
+		int rename_fn(struct user_namespace *user_ns, struct inode *sip,
+			struct dentry *sdp, struct inode *tip, struct dentry *tdp,
+			unsigned int flags) { return 0; }
+
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.rename = rename_fn,
+		};
+	],[])
 ])
 
-AC_DEFUN([ZFS_AC_KERNEL_RENAME_WANTS_FLAGS], [
+AC_DEFUN([ZFS_AC_KERNEL_RENAME], [
-	AC_MSG_CHECKING([whether iops->rename() wants flags])
+	AC_MSG_CHECKING([whether iops->rename() takes struct user_namespace*])
-	ZFS_LINUX_TEST_RESULT([inode_operations_rename], [
+	ZFS_LINUX_TEST_RESULT([inode_operations_rename_userns], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_IOPS_RENAME_USERNS, 1,
+		    [iops->rename() takes struct user_namespace*])
+	],[
+		AC_MSG_RESULT(no)
+
+		ZFS_LINUX_TEST_RESULT([inode_operations_rename_flags], [
 			AC_MSG_RESULT(yes)
 			AC_DEFINE(HAVE_RENAME_WANTS_FLAGS, 1,
 				[iops->rename() wants flags])
 		],[
 			AC_MSG_RESULT(no)
 		])
+	])
 ])

config/kernel-setattr-prepare.m4

@@ -1,9 +1,9 @@
-dnl #
-dnl # 4.9 API change
-dnl # The inode_change_ok() function has been renamed setattr_prepare()
-dnl # and updated to take a dentry rather than an inode.
-dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_SETATTR_PREPARE], [
+	dnl #
+	dnl # 4.9 API change
+	dnl # The inode_change_ok() function has been renamed setattr_prepare()
+	dnl # and updated to take a dentry rather than an inode.
+	dnl #
 	ZFS_LINUX_TEST_SRC([setattr_prepare], [
 		#include <linux/fs.h>
 	], [
@@ -12,16 +12,41 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_SETATTR_PREPARE], [
 		int error __attribute__ ((unused)) =
 			setattr_prepare(dentry, attr);
 	])
+
+	dnl #
+	dnl # 5.12 API change
+	dnl # The setattr_prepare() function has been changed to accept a new argument
+	dnl # for struct user_namespace*
+	dnl #
+	ZFS_LINUX_TEST_SRC([setattr_prepare_userns], [
+		#include <linux/fs.h>
+	], [
+		struct dentry *dentry = NULL;
+		struct iattr *attr = NULL;
+		struct user_namespace *userns = NULL;
+		int error __attribute__ ((unused)) =
+			setattr_prepare(userns, dentry, attr);
+	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_SETATTR_PREPARE], [
-	AC_MSG_CHECKING([whether setattr_prepare() is available])
+	AC_MSG_CHECKING([whether setattr_prepare() is available and accepts struct user_namespace*])
+	ZFS_LINUX_TEST_RESULT_SYMBOL([setattr_prepare_userns],
+	    [setattr_prepare], [fs/attr.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SETATTR_PREPARE_USERNS, 1,
+		    [setattr_prepare() accepts user_namespace])
+	], [
+		AC_MSG_RESULT(no)
+
+		AC_MSG_CHECKING([whether setattr_prepare() is available, doesn't accept user_namespace])
 		ZFS_LINUX_TEST_RESULT_SYMBOL([setattr_prepare],
 			[setattr_prepare], [fs/attr.c], [
 			AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_SETATTR_PREPARE, 1,
+			AC_DEFINE(HAVE_SETATTR_PREPARE_NO_USERNS, 1,
-		    [setattr_prepare() is available])
+				[setattr_prepare() is available, doesn't accept user_namespace])
 		], [
 			AC_MSG_RESULT(no)
 		])
+	])
 ])

config/kernel-siginfo.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # 4.20 API change
+dnl # Added kernel_siginfo_t
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_SIGINFO], [
+	ZFS_LINUX_TEST_SRC([siginfo], [
+		#include <linux/signal_types.h>
+	],[
+		kernel_siginfo_t info __attribute__ ((unused));
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SIGINFO], [
+	AC_MSG_CHECKING([whether kernel_siginfo_t tyepedef exists])
+	ZFS_LINUX_TEST_RESULT([siginfo], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SIGINFO, 1, [kernel_siginfo_t exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-signal-stop.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # 4.4 API change
+dnl # Added kernel_signal_stop
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_SIGNAL_STOP], [
+	ZFS_LINUX_TEST_SRC([signal_stop], [
+		#include <linux/sched/signal.h>
+	],[
+		kernel_signal_stop();
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SIGNAL_STOP], [
+	AC_MSG_CHECKING([whether signal_stop() exists])
+	ZFS_LINUX_TEST_RESULT([signal_stop], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SIGNAL_STOP, 1, [signal_stop() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-special-state.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # 4.17 API change
+dnl # Added set_special_state() function
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE], [
+	ZFS_LINUX_TEST_SRC([set_special_state], [
+		#include <linux/sched.h>
+	],[
+		set_special_state(TASK_STOPPED);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SET_SPECIAL_STATE], [
+	AC_MSG_CHECKING([whether set_special_state() exists])
+	ZFS_LINUX_TEST_RESULT([set_special_state], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SET_SPECIAL_STATE, 1, [set_special_state() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-stdarg.m4

@@ -0,0 +1,32 @@
+dnl #
+dnl # Linux 5.15 gets rid of -isystem and external <stdarg.h> inclusion
+dnl # and ships its own <linux/stdarg.h>. Check if this header file does
+dnl # exist and provide all necessary definitions for variable argument
+dnl # functions. Adjust the inclusion of <stdarg.h> according to the
+dnl # results.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG], [
+	ZFS_LINUX_TEST_SRC([has_standalone_linux_stdarg], [
+		#include <linux/stdarg.h>
+
+		#if !defined(va_start) || !defined(va_end) || \
+		    !defined(va_arg) || !defined(va_copy)
+		#error "<linux/stdarg.h> is invalid"
+		#endif
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG], [
+	dnl #
+	dnl # Linux 5.15 ships its own stdarg.h and doesn't allow to
+	dnl # include compiler headers.
+	dnl #
+	AC_MSG_CHECKING([whether standalone <linux/stdarg.h> exists])
+	ZFS_LINUX_TEST_RESULT([has_standalone_linux_stdarg], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_STANDALONE_LINUX_STDARG, 1,
+			[standalone <linux/stdarg.h> exists])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])

config/kernel-symlink.m4

@@ -0,0 +1,30 @@
+AC_DEFUN([ZFS_AC_KERNEL_SRC_SYMLINK], [
+	dnl #
+	dnl # 5.12 API change that added the struct user_namespace* arg
+	dnl # to the front of this function type's arg list.
+	dnl #
+	ZFS_LINUX_TEST_SRC([symlink_userns], [
+		#include <linux/fs.h>
+		#include <linux/sched.h>
+
+		int tmp_symlink(struct user_namespace *userns,
+		    struct inode *inode ,struct dentry *dentry,
+		    const char *path) { return 0; }
+
+		static const struct inode_operations
+			iops __attribute__ ((unused)) = {
+			.symlink		= tmp_symlink,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SYMLINK], [
+	AC_MSG_CHECKING([whether iops->symlink() takes struct user_namespace*])
+	ZFS_LINUX_TEST_RESULT([symlink_userns], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_IOPS_SYMLINK_USERNS, 1,
+		    [iops->symlink() takes struct user_namespace*])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-tmpfile.m4

@@ -3,6 +3,20 @@ dnl # 3.11 API change
 dnl # Add support for i_op->tmpfile
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_TMPFILE], [
+	dnl #
+	dnl # 5.11 API change
+	dnl # add support for userns parameter to tmpfile
+	dnl #
+	ZFS_LINUX_TEST_SRC([inode_operations_tmpfile_userns], [
+		#include <linux/fs.h>
+		int tmpfile(struct user_namespace *userns,
+		    struct inode *inode, struct dentry *dentry,
+		    umode_t mode) { return 0; }
+		static struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.tmpfile = tmpfile,
+		};
+	],[])
 	ZFS_LINUX_TEST_SRC([inode_operations_tmpfile], [
 			#include <linux/fs.h>
 			int tmpfile(struct inode *inode, struct dentry *dentry,
@@ -16,10 +30,16 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_TMPFILE], [
 
 AC_DEFUN([ZFS_AC_KERNEL_TMPFILE], [
 	AC_MSG_CHECKING([whether i_op->tmpfile() exists])
+	ZFS_LINUX_TEST_RESULT([inode_operations_tmpfile_userns], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_TMPFILE, 1, [i_op->tmpfile() exists])
+		AC_DEFINE(HAVE_TMPFILE_USERNS, 1, [i_op->tmpfile() has userns])
+	],[
 		ZFS_LINUX_TEST_RESULT([inode_operations_tmpfile], [
 			AC_MSG_RESULT(yes)
 			AC_DEFINE(HAVE_TMPFILE, 1, [i_op->tmpfile() exists])
 		],[
 			AC_MSG_RESULT(no)
 		])
+	])
 ])

config/kernel-vfs-iov_iter.m4

@@ -99,6 +99,14 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
 
 		bytes = copy_from_iter((void *)&buf, size, &iter);
 	])
+
+	ZFS_LINUX_TEST_SRC([iov_iter_type], [
+		#include <linux/fs.h>
+		#include <linux/uio.h>
+	],[
+		struct iov_iter iter = { 0 };
+		__attribute__((unused)) enum iter_type i = iov_iter_type(&iter);
+	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
@@ -193,6 +201,20 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
 		enable_vfs_iov_iter="no"
 	])
 
+	dnl #
+	dnl # This checks for iov_iter_type() in linux/uio.h. It is not
+	dnl # required, however, and the module will compiled without it
+	dnl # using direct access of the member attribute
+	dnl #
+	AC_MSG_CHECKING([whether iov_iter_type() is available])
+	ZFS_LINUX_TEST_RESULT([iov_iter_type], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_IOV_ITER_TYPE, 1,
+		    [iov_iter_type() is available])
+	],[
+		AC_MSG_RESULT(no)
+	])
+
 	dnl #
 	dnl # As of the 4.9 kernel support is provided for iovecs, kvecs,
 	dnl # bvecs and pipes in the iov_iter structure.  As long as the

config/kernel-vfs-set_page_dirty.m4

@@ -0,0 +1,34 @@
+dnl #
+dnl # Linux 5.14 adds a change to require set_page_dirty to be manually
+dnl # wired up in struct address_space_operations. Determine if this needs
+dnl # to be done. This patch set also introduced __set_page_dirty_nobuffers
+dnl # declaration in linux/pagemap.h, so these tests look for the presence
+dnl # of that function to tell the compiler to assign set_page_dirty in
+dnl # module/os/linux/zfs/zpl_file.c
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS], [
+	ZFS_LINUX_TEST_SRC([vfs_has_set_page_dirty_nobuffers], [
+		#include <linux/pagemap.h>
+		#include <linux/fs.h>
+
+		static const struct address_space_operations
+		    aops __attribute__ ((unused)) = {
+			.set_page_dirty = __set_page_dirty_nobuffers,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS], [
+	dnl #
+	dnl # Linux 5.14 change requires set_page_dirty() to be assigned
+	dnl # in address_space_operations()
+	dnl #
+	AC_MSG_CHECKING([__set_page_dirty_nobuffers exists])
+	ZFS_LINUX_TEST_RESULT([vfs_has_set_page_dirty_nobuffers], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_VFS_SET_PAGE_DIRTY_NOBUFFERS, 1,
+			[__set_page_dirty_nobuffers exists])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])

config/kernel-xattr-handler.m4

@@ -152,6 +152,21 @@ dnl #
 dnl # Supported xattr handler set() interfaces checked newest to oldest.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_XATTR_HANDLER_SET], [
+	ZFS_LINUX_TEST_SRC([xattr_handler_set_userns], [
+		#include <linux/xattr.h>
+
+		int set(const struct xattr_handler *handler,
+			struct user_namespace *mnt_userns,
+			struct dentry *dentry, struct inode *inode,
+			const char *name, const void *buffer,
+			size_t size, int flags)
+			{ return 0; }
+		static const struct xattr_handler
+			xops __attribute__ ((unused)) = {
+			.set = set,
+		};
+	],[])
+
 	ZFS_LINUX_TEST_SRC([xattr_handler_set_dentry_inode], [
 		#include <linux/xattr.h>
 
@@ -193,11 +208,23 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_XATTR_HANDLER_SET], [
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_SET], [
+	dnl #
+	dnl # 5.12 API change,
+	dnl # The xattr_handler->set() callback was changed to 8 arguments, and
+	dnl # struct user_namespace* was inserted as arg #2
+	dnl #
+	AC_MSG_CHECKING([whether xattr_handler->set() wants dentry, inode, and user_namespace])
+	ZFS_LINUX_TEST_RESULT([xattr_handler_set_userns], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_XATTR_SET_USERNS, 1,
+		    [xattr_handler->set() takes user_namespace])
+	],[
 		dnl #
 		dnl # 4.7 API change,
 		dnl # The xattr_handler->set() callback was changed to take both
 		dnl # dentry and inode.
 		dnl #
+		AC_MSG_RESULT(no)
 		AC_MSG_CHECKING([whether xattr_handler->set() wants dentry and inode])
 		ZFS_LINUX_TEST_RESULT([xattr_handler_set_dentry_inode], [
 			AC_MSG_RESULT(yes)
@@ -236,6 +263,7 @@ AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_SET], [
 				])
 			])
 		])
+	])
 ])
 
 dnl #

config/kernel.m4

@@ -79,9 +79,9 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_EVICT_INODE
 	ZFS_AC_KERNEL_SRC_DIRTY_INODE
 	ZFS_AC_KERNEL_SRC_SHRINKER
-	ZFS_AC_KERNEL_SRC_MKDIR_UMODE_T
+	ZFS_AC_KERNEL_SRC_MKDIR
 	ZFS_AC_KERNEL_SRC_LOOKUP_FLAGS
-	ZFS_AC_KERNEL_SRC_CREATE_FLAGS
+	ZFS_AC_KERNEL_SRC_CREATE
 	ZFS_AC_KERNEL_SRC_GET_LINK
 	ZFS_AC_KERNEL_SRC_PUT_LINK
 	ZFS_AC_KERNEL_SRC_TMPFILE
@@ -115,7 +115,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_KUIDGID_T
 	ZFS_AC_KERNEL_SRC_KUID_HELPERS
 	ZFS_AC_KERNEL_SRC_MODULE_PARAM_CALL_CONST
-	ZFS_AC_KERNEL_SRC_RENAME_WANTS_FLAGS
+	ZFS_AC_KERNEL_SRC_RENAME
 	ZFS_AC_KERNEL_SRC_CURRENT_TIME
 	ZFS_AC_KERNEL_SRC_USERNS_CAPABILITIES
 	ZFS_AC_KERNEL_SRC_IN_COMPAT_SYSCALL
@@ -124,6 +124,16 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_TOTALHIGH_PAGES
 	ZFS_AC_KERNEL_SRC_KSTRTOUL
 	ZFS_AC_KERNEL_SRC_PERCPU
+	ZFS_AC_KERNEL_SRC_GENERIC_FILLATTR_USERNS
+	ZFS_AC_KERNEL_SRC_MKNOD
+	ZFS_AC_KERNEL_SRC_SYMLINK
+	ZFS_AC_KERNEL_SRC_BIO_MAX_SEGS
+	ZFS_AC_KERNEL_SRC_SIGNAL_STOP
+	ZFS_AC_KERNEL_SRC_SIGINFO
+	ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE
+	ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS
+	ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG
+	ZFS_AC_KERNEL_SRC_PAGEMAP_FOLIO_WAIT_BIT
 
 	AC_MSG_CHECKING([for available kernel interfaces])
 	ZFS_LINUX_TEST_COMPILE_ALL([kabi])
@@ -176,9 +186,9 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_EVICT_INODE
 	ZFS_AC_KERNEL_DIRTY_INODE
 	ZFS_AC_KERNEL_SHRINKER
-	ZFS_AC_KERNEL_MKDIR_UMODE_T
+	ZFS_AC_KERNEL_MKDIR
 	ZFS_AC_KERNEL_LOOKUP_FLAGS
-	ZFS_AC_KERNEL_CREATE_FLAGS
+	ZFS_AC_KERNEL_CREATE
 	ZFS_AC_KERNEL_GET_LINK
 	ZFS_AC_KERNEL_PUT_LINK
 	ZFS_AC_KERNEL_TMPFILE
@@ -212,7 +222,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_KUIDGID_T
 	ZFS_AC_KERNEL_KUID_HELPERS
 	ZFS_AC_KERNEL_MODULE_PARAM_CALL_CONST
-	ZFS_AC_KERNEL_RENAME_WANTS_FLAGS
+	ZFS_AC_KERNEL_RENAME
 	ZFS_AC_KERNEL_CURRENT_TIME
 	ZFS_AC_KERNEL_USERNS_CAPABILITIES
 	ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
@@ -221,6 +231,16 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_TOTALHIGH_PAGES
 	ZFS_AC_KERNEL_KSTRTOUL
 	ZFS_AC_KERNEL_PERCPU
+	ZFS_AC_KERNEL_GENERIC_FILLATTR_USERNS
+	ZFS_AC_KERNEL_MKNOD
+	ZFS_AC_KERNEL_SYMLINK
+	ZFS_AC_KERNEL_BIO_MAX_SEGS
+	ZFS_AC_KERNEL_SIGNAL_STOP
+	ZFS_AC_KERNEL_SIGINFO
+	ZFS_AC_KERNEL_SET_SPECIAL_STATE
+	ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
+	ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
+	ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT
 ])
 
 dnl #

config/zfs-build.m4

@@ -153,8 +153,12 @@ AC_DEFUN([ZFS_AC_DEBUG_KMEM_TRACKING], [
 ])
 
 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
+	AX_COUNT_CPUS([])
+	AC_SUBST(CPU_COUNT)
+
 	ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE
 	ZFS_AC_CONFIG_ALWAYS_CC_NO_BOOL_COMPARE
+	ZFS_AC_CONFIG_ALWAYS_CC_IMPLICIT_FALLTHROUGH
 	ZFS_AC_CONFIG_ALWAYS_CC_FRAME_LARGER_THAN
 	ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_TRUNCATION
 	ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_ZERO_LENGTH
@@ -167,6 +171,7 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
 	ZFS_AC_CONFIG_ALWAYS_PYTHON
 	ZFS_AC_CONFIG_ALWAYS_PYZFS
 	ZFS_AC_CONFIG_ALWAYS_SED
+	ZFS_AC_CONFIG_ALWAYS_CPPCHECK
 ])
 
 AC_DEFUN([ZFS_AC_CONFIG], [
@@ -191,12 +196,10 @@ AC_DEFUN([ZFS_AC_CONFIG], [
 
 	ZFS_AC_CONFIG_ALWAYS
 
-
 	AM_COND_IF([BUILD_LINUX], [
-		AC_ARG_VAR([TEST_JOBS],
+		AC_ARG_VAR([TEST_JOBS], [simultaneous jobs during configure])
-		    [simultaneous jobs during configure (defaults to $(nproc))])
 		if test "x$ac_cv_env_TEST_JOBS_set" != "xset"; then
-			TEST_JOBS=$(nproc)
+			TEST_JOBS=$CPU_COUNT
 		fi
 		AC_SUBST(TEST_JOBS)
 	])

configure.ac

@@ -221,6 +221,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/cmd/mktree/Makefile
 	tests/zfs-tests/cmd/mmap_exec/Makefile
 	tests/zfs-tests/cmd/mmap_libaio/Makefile
+	tests/zfs-tests/cmd/mmap_seek/Makefile
 	tests/zfs-tests/cmd/mmapwrite/Makefile
 	tests/zfs-tests/cmd/nvlist_to_lua/Makefile
 	tests/zfs-tests/cmd/randfree_file/Makefile
@@ -228,6 +229,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/cmd/readmmap/Makefile
 	tests/zfs-tests/cmd/rename_dir/Makefile
 	tests/zfs-tests/cmd/rm_lnkcnt_zero_file/Makefile
+	tests/zfs-tests/cmd/send_doall/Makefile
 	tests/zfs-tests/cmd/stride_dd/Makefile
 	tests/zfs-tests/cmd/threadsappend/Makefile
 	tests/zfs-tests/cmd/user_ns_exec/Makefile
@@ -236,6 +238,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/tests/Makefile
 	tests/zfs-tests/tests/functional/Makefile
 	tests/zfs-tests/tests/functional/acl/Makefile
+	tests/zfs-tests/tests/functional/acl/off/Makefile
 	tests/zfs-tests/tests/functional/acl/posix/Makefile
 	tests/zfs-tests/tests/functional/acl/posix-sa/Makefile
 	tests/zfs-tests/tests/functional/alloc_class/Makefile

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

@@ -59,4 +59,12 @@ echo "zfs-generator: writing extension for sysroot.mount to $GENERATOR_DIR"/sysr
 [ -d "$GENERATOR_DIR"/initrd-root-fs.target.requires ] || mkdir -p "$GENERATOR_DIR"/initrd-root-fs.target.requires
 ln -s ../sysroot.mount "$GENERATOR_DIR"/initrd-root-fs.target.requires/sysroot.mount
 
+
+[ -d "$GENERATOR_DIR"/dracut-pre-mount.service.d ] || mkdir "$GENERATOR_DIR"/dracut-pre-mount.service.d
+
+{
+    echo "[Unit]"
+    echo "After=zfs-import.target"
+} > "$GENERATOR_DIR"/dracut-pre-mount.service.d/zfs-enhancement.conf
+
 echo "zfs-generator: finished" >> /dev/kmsg

contrib/pam_zfs_key/pam_zfs_key.c

@@ -82,7 +82,11 @@ alloc_pw_size(size_t len)
 		return (NULL);
 	}
 	pw->len = len;
-	pw->value = malloc(len);
+	/*
+	 * The use of malloc() triggers a spurious gcc 11 -Wmaybe-uninitialized
+	 * warning in the mlock() function call below, so use calloc().
+	 */
+	pw->value = calloc(len, 1);
 	if (!pw->value) {
 		free(pw);
 		return (NULL);
@@ -99,7 +103,11 @@ alloc_pw_string(const char *source)
 		return (NULL);
 	}
 	pw->len = strlen(source) + 1;
-	pw->value = malloc(pw->len);
+	/*
+	 * The use of malloc() triggers a spurious gcc 11 -Wmaybe-uninitialized
+	 * warning in the mlock() function call below, so use calloc().
+	 */
+	pw->value = calloc(pw->len, 1);
 	if (!pw->value) {
 		free(pw);
 		return (NULL);

cppcheck-suppressions.txt

@@ -1,8 +0,0 @@
-preprocessorErrorDirective:./module/zfs/vdev_raidz_math_avx512f.c:243
-preprocessorErrorDirective:./module/zfs/vdev_raidz_math_sse2.c:266
-uninitvar:module/os/freebsd/zfs/vdev_geom.c
-uninitvar:module/os/freebsd/zfs/zfs_vfsops.c
-uninitvar:module/os/freebsd/spl/spl_zone.c
-uninitvar:lib/libzutil/os/freebsd/zutil_import_os.c
-*:module/zstd/lib/zstd.c
-*:module/zstd/lib/zstd.h

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

@@ -8,7 +8,7 @@ After=cryptsetup.target
 After=multipathd.target
 After=systemd-remount-fs.service
 Before=zfs-import.target
-ConditionPathExists=@sysconfdir@/zfs/zpool.cache
+ConditionFileNotEmpty=@sysconfdir@/zfs/zpool.cache
 ConditionPathIsDirectory=/sys/module/zfs
 
 [Service]

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

@@ -7,7 +7,7 @@ After=systemd-udev-settle.service
 After=cryptsetup.target
 After=multipathd.target
 Before=zfs-import.target
-ConditionPathExists=!@sysconfdir@/zfs/zpool.cache
+ConditionFileNotEmpty=!@sysconfdir@/zfs/zpool.cache
 ConditionPathIsDirectory=/sys/module/zfs
 
 [Service]

include/libzutil.h

@@ -159,6 +159,16 @@ void color_start(char *color);
 void color_end(void);
 int printf_color(char *color, char *format, ...);
 
+/*
+ * These functions are used by the ZFS libraries and cmd/zpool code, but are
+ * not exported in the ABI.
+ */
+typedef int (*pool_vdev_iter_f)(void *, nvlist_t *, void *);
+int for_each_vdev_cb(void *zhp, nvlist_t *nv, pool_vdev_iter_f func,
+    void *data);
+int for_each_vdev_in_nvlist(nvlist_t *nvroot, pool_vdev_iter_f func,
+    void *data);
+void update_vdevs_config_dev_sysfs_path(nvlist_t *config);
 #ifdef	__cplusplus
 }
 #endif

include/os/freebsd/linux/compiler.h

@@ -67,6 +67,7 @@
 #define	__always_inline			inline
 #define	noinline			__noinline
 #define	____cacheline_aligned		__aligned(CACHE_LINE_SIZE)
+#define	fallthrough			__attribute__((__fallthrough__))
 
 #if !defined(_KERNEL) && !defined(_STANDALONE)
 #define	likely(x)			__builtin_expect(!!(x), 1)

include/os/freebsd/spl/sys/Makefile.am

@@ -4,6 +4,7 @@ KERNEL_H = \
 	atomic.h \
 	byteorder.h \
 	callb.h \
+	ccompat.h \
 	ccompile.h \
 	cmn_err.h \
 	condvar.h \
@@ -18,9 +19,11 @@ KERNEL_H = \
 	fcntl.h \
 	file.h \
 	freebsd_rwlock.h \
+	idmap.h \
 	inttypes.h \
 	isa_defs.h \
 	kmem_cache.h \
+	kidmap.h \
 	kmem.h \
 	kstat.h \
 	list_impl.h \

include/os/freebsd/spl/sys/debug.h

@@ -74,9 +74,9 @@ void spl_dumpstack(void);
 	    "%s", "VERIFY(" #cond ") failed\n"))
 
 #define	VERIFY3B(LEFT, OP, RIGHT)	do {					\
-		boolean_t _verify3_left = (boolean_t)(LEFT);		\
+		const boolean_t _verify3_left = (boolean_t)(LEFT);	\
-		boolean_t _verify3_right = (boolean_t)(RIGHT);		\
+		const boolean_t _verify3_right = (boolean_t)(RIGHT);\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%d " #OP " %d)\n",						\
@@ -85,9 +85,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY3S(LEFT, OP, RIGHT)	do {					\
-		int64_t _verify3_left = (int64_t)(LEFT);		\
+		const int64_t _verify3_left = (int64_t)(LEFT);		\
-		int64_t _verify3_right = (int64_t)(RIGHT);		\
+		const int64_t _verify3_right = (int64_t)(RIGHT);	\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%lld " #OP " %lld)\n",					\
@@ -96,9 +96,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY3U(LEFT, OP, RIGHT)	do {					\
-		uint64_t _verify3_left = (uint64_t)(LEFT);		\
+		const uint64_t _verify3_left = (uint64_t)(LEFT);	\
-		uint64_t _verify3_right = (uint64_t)(RIGHT);		\
+		const uint64_t _verify3_right = (uint64_t)(RIGHT);	\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%llu " #OP " %llu)\n",					\
@@ -107,9 +107,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY3P(LEFT, OP, RIGHT)	do {					\
-		uintptr_t _verify3_left = (uintptr_t)(LEFT);		\
+		const uintptr_t _verify3_left = (uintptr_t)(LEFT);	\
-		uintptr_t _verify3_right = (uintptr_t)(RIGHT);		\
+		const uintptr_t _verify3_right = (uintptr_t)(RIGHT);\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%px " #OP " %px)\n",					\
@@ -118,9 +118,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY0(RIGHT)	do {								\
-		int64_t _verify3_left = (int64_t)(0);		\
+		const int64_t _verify3_left = (int64_t)(0);			\
-		int64_t _verify3_right = (int64_t)(RIGHT);		\
+		const int64_t _verify3_right = (int64_t)(RIGHT);	\
-		if (!(_verify3_left == _verify3_right))			\
+		if (unlikely(!(_verify3_left == _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(0 == " #RIGHT ") "						\
 		    "failed (0 == %lld)\n",							\
@@ -154,11 +154,11 @@ void spl_dumpstack(void);
 #define	ASSERT0		VERIFY0
 #define	ASSERT		VERIFY
 #define	IMPLY(A, B) \
-	((void)(((!(A)) || (B)) || \
+	((void)(likely((!(A)) || (B)) || \
 	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
 	    "(" #A ") implies (" #B ")")))
 #define	EQUIV(A, B) \
-	((void)((!!(A) == !!(B)) || \
+	((void)(likely(!!(A) == !!(B)) || \
 	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
 	    "(" #A ") is equivalent to (" #B ")")))
 /* END CSTYLED */

include/os/freebsd/spl/sys/misc.h

@@ -30,6 +30,7 @@
 #define	_OPENSOLARIS_SYS_MISC_H_
 
 #include <sys/limits.h>
+#include <sys/filio.h>
 
 #define	MAXUID	UID_MAX
 
@@ -40,8 +41,8 @@
 #define	_FIOGDIO	(INT_MIN+1)
 #define	_FIOSDIO	(INT_MIN+2)
 
-#define	_FIO_SEEK_DATA	FIOSEEKDATA
+#define	F_SEEK_DATA	FIOSEEKDATA
-#define	_FIO_SEEK_HOLE	FIOSEEKHOLE
+#define	F_SEEK_HOLE	FIOSEEKHOLE
 
 struct opensolaris_utsname {
 	char	*sysname;

include/os/freebsd/spl/sys/uio.h

@@ -35,81 +35,47 @@
 #include <sys/_uio.h>
 #include <sys/debug.h>
 
-
-
-#define	uio_loffset	uio_offset
-
-typedef	struct uio	uio_t;
 typedef	struct iovec	iovec_t;
-typedef	enum uio_seg	uio_seg_t;
+typedef	enum uio_seg	zfs_uio_seg_t;
+typedef	enum uio_rw	zfs_uio_rw_t;
 
-typedef enum xuio_type {
+typedef struct zfs_uio {
-	UIOTYPE_ASYNCIO,
+	struct uio	*uio;
-	UIOTYPE_ZEROCOPY
+} zfs_uio_t;
-} xuio_type_t;
 
-typedef struct xuio {
+#define	GET_UIO_STRUCT(u)	(u)->uio
-	uio_t	xu_uio;
+#define	zfs_uio_segflg(u)	GET_UIO_STRUCT(u)->uio_segflg
-
+#define	zfs_uio_offset(u)	GET_UIO_STRUCT(u)->uio_offset
-	/* Extended uio fields */
+#define	zfs_uio_resid(u)	GET_UIO_STRUCT(u)->uio_resid
-	enum xuio_type xu_type; /* What kind of uio structure? */
+#define	zfs_uio_iovcnt(u)	GET_UIO_STRUCT(u)->uio_iovcnt
-	union {
+#define	zfs_uio_iovlen(u, idx)	GET_UIO_STRUCT(u)->uio_iov[(idx)].iov_len
-		struct {
+#define	zfs_uio_iovbase(u, idx)	GET_UIO_STRUCT(u)->uio_iov[(idx)].iov_base
-			int xu_zc_rw;
+#define	zfs_uio_td(u)		GET_UIO_STRUCT(u)->uio_td
-			void *xu_zc_priv;
+#define	zfs_uio_rw(u)		GET_UIO_STRUCT(u)->uio_rw
-		} xu_zc;
+#define	zfs_uio_fault_disable(u, set)
-	} xu_ext;
+#define	zfs_uio_prefaultpages(size, u)	(0)
-} xuio_t;
-
-#define	XUIO_XUZC_PRIV(xuio)	xuio->xu_ext.xu_zc.xu_zc_priv
-#define	XUIO_XUZC_RW(xuio)	xuio->xu_ext.xu_zc.xu_zc_rw
-
-static __inline int
-zfs_uiomove(void *cp, size_t n, enum uio_rw dir, uio_t *uio)
-{
-
-	ASSERT(uio->uio_rw == dir);
-	return (uiomove(cp, (int)n, uio));
-}
-#define	uiomove(cp, n, dir, uio)	zfs_uiomove((cp), (n), (dir), (uio))
-
-int uiocopy(void *p, size_t n, enum uio_rw rw, struct uio *uio, size_t *cbytes);
-void uioskip(uio_t *uiop, size_t n);
-
-#define	uio_segflg(uio)			(uio)->uio_segflg
-#define	uio_offset(uio)			(uio)->uio_loffset
-#define	uio_resid(uio)			(uio)->uio_resid
-#define	uio_iovcnt(uio)			(uio)->uio_iovcnt
-#define	uio_iovlen(uio, idx)		(uio)->uio_iov[(idx)].iov_len
-#define	uio_iovbase(uio, idx)		(uio)->uio_iov[(idx)].iov_base
-#define	uio_fault_disable(uio, set)
 
 static inline void
-uio_iov_at_index(uio_t *uio, uint_t idx, void **base, uint64_t *len)
+zfs_uio_setoffset(zfs_uio_t *uio, offset_t off)
 {
-	*base = uio_iovbase(uio, idx);
+	zfs_uio_offset(uio) = off;
-	*len = uio_iovlen(uio, idx);
 }
 
 static inline void
-uio_advance(uio_t *uio, size_t size)
+zfs_uio_advance(zfs_uio_t *uio, size_t size)
 {
-	uio->uio_resid -= size;
+	zfs_uio_resid(uio) -= size;
-	uio->uio_loffset += size;
+	zfs_uio_offset(uio) += size;
 }
 
-static inline offset_t
+static __inline void
-uio_index_at_offset(uio_t *uio, offset_t off, uint_t *vec_idx)
+zfs_uio_init(zfs_uio_t *uio, struct uio *uio_s)
 {
-	*vec_idx = 0;
+	GET_UIO_STRUCT(uio) = uio_s;
-	while (*vec_idx < uio_iovcnt(uio) && off >= uio_iovlen(uio, *vec_idx)) {
-		off -= uio_iovlen(uio, *vec_idx);
-		(*vec_idx)++;
-	}
-
-	return (off);
 }
 
+int zfs_uio_fault_move(void *p, size_t n, zfs_uio_rw_t dir, zfs_uio_t *uio);
+
 #endif /* !_STANDALONE */
 
 #endif	/* !_OPENSOLARIS_SYS_UIO_H_ */

include/os/freebsd/spl/sys/vnode.h

@@ -59,6 +59,8 @@ enum symfollow { NO_FOLLOW = NOFOLLOW };
 #include <sys/file.h>
 #include <sys/filedesc.h>
 #include <sys/syscallsubr.h>
+#include <sys/vm.h>
+#include <vm/vm_object.h>
 
 typedef	struct vop_vector	vnodeops_t;
 #define	VOP_FID		VOP_VPTOFH
@@ -88,6 +90,22 @@ vn_is_readonly(vnode_t *vp)
 #define	vn_has_cached_data(vp)	\
 	((vp)->v_object != NULL && \
 	(vp)->v_object->resident_page_count > 0)
+
+static __inline void
+vn_flush_cached_data(vnode_t *vp, boolean_t sync)
+{
+#if __FreeBSD_version > 1300054
+	if (vm_object_mightbedirty(vp->v_object)) {
+#else
+	if (vp->v_object->flags & OBJ_MIGHTBEDIRTY) {
+#endif
+		int flags = sync ? OBJPC_SYNC : 0;
+		zfs_vmobject_wlock(vp->v_object);
+		vm_object_page_clean(vp->v_object, 0, 0, flags);
+		zfs_vmobject_wunlock(vp->v_object);
+	}
+}
+
 #define	vn_exists(vp)		do { } while (0)
 #define	vn_invalid(vp)		do { } while (0)
 #define	vn_renamepath(tdvp, svp, tnm, lentnm)	do { } while (0)

include/os/freebsd/zfs/sys/freebsd_crypto.h

@@ -92,7 +92,7 @@ int freebsd_crypt_newsession(freebsd_crypt_session_t *sessp,
 void freebsd_crypt_freesession(freebsd_crypt_session_t *sessp);
 
 int freebsd_crypt_uio(boolean_t, freebsd_crypt_session_t *,
-	struct zio_crypt_info *, uio_t *, crypto_key_t *, uint8_t *,
+	struct zio_crypt_info *, zfs_uio_t *, crypto_key_t *, uint8_t *,
 	size_t, size_t);
 
 #endif /* _ZFS_FREEBSD_CRYPTO_H */

include/os/freebsd/zfs/sys/zfs_context_os.h

@@ -42,7 +42,6 @@
 #include <linux/types.h>
 
 #define	cond_resched()		kern_yield(PRI_USER)
-#define	uio_prefaultpages(size, uio) (0)
 
 #define	taskq_create_sysdc(a, b, d, e, p, dc, f) \
 	    (taskq_create(a, b, maxclsyspri, d, e, f))

include/os/freebsd/zfs/sys/zfs_vfsops_os.h

@@ -27,6 +27,10 @@
 #ifndef	_SYS_FS_ZFS_VFSOPS_H
 #define	_SYS_FS_ZFS_VFSOPS_H
 
+#if __FreeBSD_version >= 1300125
+#define	TEARDOWN_RMS
+#endif
+
 #if __FreeBSD_version >= 1300109
 #define	TEARDOWN_INACTIVE_RMS
 #endif
@@ -46,10 +50,16 @@
 extern "C" {
 #endif
 
-#ifdef TEARDOWN_INACTIVE_RMS
+#ifdef TEARDOWN_RMS
 typedef struct rmslock zfs_teardown_lock_t;
 #else
-#define	zfs_teardown_lock_t krwlock_t
+#define	zfs_teardown_lock_t		rrmlock_t
+#endif
+
+#ifdef TEARDOWN_INACTIVE_RMS
+typedef struct rmslock zfs_teardown_inactive_lock_t;
+#else
+#define	zfs_teardown_inactive_lock_t krwlock_t
 #endif
 
 typedef struct zfsvfs zfsvfs_t;
@@ -80,8 +90,8 @@ struct zfsvfs {
 	int		z_norm;		/* normalization flags */
 	boolean_t	z_atime;	/* enable atimes mount option */
 	boolean_t	z_unmounted;	/* unmounted */
-	rrmlock_t	z_teardown_lock;
+	zfs_teardown_lock_t z_teardown_lock;
-	zfs_teardown_lock_t z_teardown_inactive_lock;
+	zfs_teardown_inactive_lock_t z_teardown_inactive_lock;
 	list_t		z_all_znodes;	/* all vnodes in the fs */
 	uint64_t	z_nr_znodes;	/* number of znodes in the fs */
 	kmutex_t	z_znodes_lock;	/* lock for z_all_znodes */
@@ -112,53 +122,121 @@ struct zfsvfs {
 	struct task	z_unlinked_drain_task;
 };
 
+#ifdef TEARDOWN_RMS
+#define	ZFS_TEARDOWN_INIT(zfsvfs)		\
+	rms_init(&(zfsvfs)->z_teardown_lock, "zfs teardown")
+
+#define	ZFS_TEARDOWN_DESTROY(zfsvfs)		\
+	rms_destroy(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_TRY_ENTER_READ(zfsvfs)	\
+	rms_try_rlock(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_ENTER_READ(zfsvfs, tag)	\
+	rms_rlock(&(zfsvfs)->z_teardown_lock);
+
+#define	ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag)	\
+	rms_runlock(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, tag)	\
+	rms_wlock(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_EXIT_WRITE(zfsvfs)		\
+	rms_wunlock(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_EXIT(zfsvfs, tag)		\
+	rms_unlock(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_READ_HELD(zfsvfs)		\
+	rms_rowned(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_WRITE_HELD(zfsvfs)		\
+	rms_wowned(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_HELD(zfsvfs)		\
+	rms_owned_any(&(zfsvfs)->z_teardown_lock)
+#else
+#define	ZFS_TEARDOWN_INIT(zfsvfs)		\
+	rrm_init(&(zfsvfs)->z_teardown_lock, B_FALSE)
+
+#define	ZFS_TEARDOWN_DESTROY(zfsvfs)		\
+	rrm_destroy(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_TRY_ENTER_READ(zfsvfs)	\
+	rw_tryenter(&(zfsvfs)->z_teardown_lock, RW_READER)
+
+#define	ZFS_TEARDOWN_ENTER_READ(zfsvfs, tag)	\
+	rrm_enter_read(&(zfsvfs)->z_teardown_lock, tag);
+
+#define	ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag)	\
+	rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
+
+#define	ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, tag)	\
+	rrm_enter(&(zfsvfs)->z_teardown_lock, RW_WRITER, tag)
+
+#define	ZFS_TEARDOWN_EXIT_WRITE(zfsvfs)		\
+	rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
+
+#define	ZFS_TEARDOWN_EXIT(zfsvfs, tag)		\
+	rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
+
+#define	ZFS_TEARDOWN_READ_HELD(zfsvfs)		\
+	RRM_READ_HELD(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_WRITE_HELD(zfsvfs)		\
+	RRM_WRITE_HELD(&(zfsvfs)->z_teardown_lock)
+
+#define	ZFS_TEARDOWN_HELD(zfsvfs)		\
+	RRM_LOCK_HELD(&(zfsvfs)->z_teardown_lock)
+#endif
+
 #ifdef TEARDOWN_INACTIVE_RMS
-#define	ZFS_INIT_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_INIT(zfsvfs)		\
 	rms_init(&(zfsvfs)->z_teardown_inactive_lock, "zfs teardown inactive")
 
-#define	ZFS_DESTROY_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_DESTROY(zfsvfs)		\
 	rms_destroy(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_TRYRLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_TRY_ENTER_READ(zfsvfs)	\
 	rms_try_rlock(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_RLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_ENTER_READ(zfsvfs)	\
 	rms_rlock(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs)		\
 	rms_runlock(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_WLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_ENTER_WRITE(zfsvfs)	\
 	rms_wlock(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_WUNLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs)	\
 	rms_wunlock(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_TEARDOWN_INACTIVE_WLOCKED(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs)	\
 	rms_wowned(&(zfsvfs)->z_teardown_inactive_lock)
 #else
-#define	ZFS_INIT_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_INIT(zfsvfs)		\
 	rw_init(&(zfsvfs)->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL)
 
-#define	ZFS_DESTROY_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_DESTROY(zfsvfs)		\
 	rw_destroy(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_TRYRLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_TRY_ENTER_READ(zfsvfs)	\
 	rw_tryenter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
 
-#define	ZFS_RLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_ENTER_READ(zfsvfs)	\
 	rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
 
-#define	ZFS_RUNLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs)		\
 	rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_WLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_ENTER_WRITE(zfsvfs)	\
 	rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_WRITER)
 
-#define	ZFS_WUNLOCK_TEARDOWN_INACTIVE(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs)	\
 	rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
 
-#define	ZFS_TEARDOWN_INACTIVE_WLOCKED(zfsvfs)	\
+#define	ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs)	\
 	RW_WRITE_HELD(&(zfsvfs)->z_teardown_inactive_lock)
 #endif
 

include/os/freebsd/zfs/sys/zfs_znode_impl.h

@@ -40,6 +40,7 @@
 #include <sys/zil.h>
 #include <sys/zfs_project.h>
 #include <vm/vm_object.h>
+#include <sys/uio.h>
 
 #ifdef	__cplusplus
 extern "C" {
@@ -117,24 +118,26 @@ extern minor_t zfsdev_minor_alloc(void);
 #define	Z_ISDIR(type) ((type) == VDIR)
 
 #define	zn_has_cached_data(zp)		vn_has_cached_data(ZTOV(zp))
-#define	zn_rlimit_fsize(zp, uio, td)	vn_rlimit_fsize(ZTOV(zp), (uio), (td))
+#define	zn_flush_cached_data(zp, sync)	vn_flush_cached_data(ZTOV(zp), sync)
+#define	zn_rlimit_fsize(zp, uio) \
+    vn_rlimit_fsize(ZTOV(zp), GET_UIO_STRUCT(uio), zfs_uio_td(uio))
 
 /* Called on entry to each ZFS vnode and vfs operation  */
 #define	ZFS_ENTER(zfsvfs) \
 	{ \
-		rrm_enter_read(&(zfsvfs)->z_teardown_lock, FTAG); \
+		ZFS_TEARDOWN_ENTER_READ((zfsvfs), FTAG); \
-		if ((zfsvfs)->z_unmounted) { \
+		if (__predict_false((zfsvfs)->z_unmounted)) { \
-			ZFS_EXIT(zfsvfs); \
+			ZFS_TEARDOWN_EXIT_READ(zfsvfs, FTAG); \
 			return (EIO); \
 		} \
 	}
 
 /* Must be called before exiting the vop */
-#define	ZFS_EXIT(zfsvfs) rrm_exit(&(zfsvfs)->z_teardown_lock, FTAG)
+#define	ZFS_EXIT(zfsvfs) ZFS_TEARDOWN_EXIT_READ(zfsvfs, FTAG)
 
 /* Verifies the znode is valid */
 #define	ZFS_VERIFY_ZP(zp) \
-	if ((zp)->z_sa_hdl == NULL) { \
+	if (__predict_false((zp)->z_sa_hdl == NULL)) { \
 		ZFS_EXIT((zp)->z_zfsvfs); \
 		return (EIO); \
 	} \
@@ -173,7 +176,6 @@ extern void	zfs_tstamp_update_setup_ext(struct znode *,
     uint_t, uint64_t [2], uint64_t [2], boolean_t have_tx);
 extern void zfs_znode_free(struct znode *);
 
-extern zil_get_data_t zfs_get_data;
 extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE];
 extern int zfsfstype;
 

include/os/linux/kernel/linux/blkdev_compat.h

@@ -30,9 +30,9 @@
 #define	_ZFS_BLKDEV_H
 
 #include <linux/blkdev.h>
-#include <linux/elevator.h>
 #include <linux/backing-dev.h>
 #include <linux/hdreg.h>
+#include <linux/major.h>
 #include <linux/msdos_fs.h>	/* for SECTOR_* */
 
 #ifndef HAVE_BLK_QUEUE_FLAG_SET
@@ -92,11 +92,14 @@ blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua)
 static inline void
 blk_queue_set_read_ahead(struct request_queue *q, unsigned long ra_pages)
 {
+#if !defined(HAVE_BLK_QUEUE_UPDATE_READAHEAD) && \
+	!defined(HAVE_DISK_UPDATE_READAHEAD)
 #ifdef HAVE_BLK_QUEUE_BDI_DYNAMIC
 	q->backing_dev_info->ra_pages = ra_pages;
 #else
 	q->backing_dev_info.ra_pages = ra_pages;
 #endif
+#endif
 }
 
 #ifdef HAVE_BIO_BVEC_ITER
@@ -277,18 +280,22 @@ bio_set_bi_error(struct bio *bio, int error)
 static inline int
 zfs_check_media_change(struct block_device *bdev)
 {
+#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
 	struct gendisk *gd = bdev->bd_disk;
 	const struct block_device_operations *bdo = gd->fops;
+#endif
 
 	if (!bdev_check_media_change(bdev))
 		return (0);
 
+#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
 	/*
 	 * Force revalidation, to mimic the old behavior of
 	 * check_disk_change()
 	 */
 	if (bdo->revalidate_disk)
 		bdo->revalidate_disk(gd);
+#endif
 
 	return (0);
 }
@@ -520,7 +527,9 @@ blk_generic_start_io_acct(struct request_queue *q __attribute__((unused)),
     struct gendisk *disk __attribute__((unused)),
     int rw __attribute__((unused)), struct bio *bio)
 {
-#if defined(HAVE_BIO_IO_ACCT)
+#if defined(HAVE_DISK_IO_ACCT)
+	return (disk_start_io_acct(disk, bio_sectors(bio), bio_op(bio)));
+#elif defined(HAVE_BIO_IO_ACCT)
 	return (bio_start_io_acct(bio));
 #elif defined(HAVE_GENERIC_IO_ACCT_3ARG)
 	unsigned long start_time = jiffies;
@@ -541,7 +550,9 @@ blk_generic_end_io_acct(struct request_queue *q __attribute__((unused)),
     struct gendisk *disk __attribute__((unused)),
     int rw __attribute__((unused)), struct bio *bio, unsigned long start_time)
 {
-#if defined(HAVE_BIO_IO_ACCT)
+#if defined(HAVE_DISK_IO_ACCT)
+	disk_end_io_acct(disk, bio_op(bio), start_time);
+#elif defined(HAVE_BIO_IO_ACCT)
 	bio_end_io_acct(bio, start_time);
 #elif defined(HAVE_GENERIC_IO_ACCT_3ARG)
 	generic_end_io_acct(rw, &disk->part0, start_time);

include/os/linux/kernel/linux/compiler_compat.h

@@ -28,6 +28,14 @@
 
 #include <linux/compiler.h>
 
+#if !defined(fallthrough)
+#if defined(HAVE_IMPLICIT_FALLTHROUGH)
+#define	fallthrough		__attribute__((__fallthrough__))
+#else
+#define	fallthrough		((void)0)
+#endif
+#endif
+
 #if !defined(READ_ONCE)
 #define	READ_ONCE(x)		ACCESS_ONCE(x)
 #endif

include/os/linux/kernel/linux/simd_x86.h

@@ -88,6 +88,9 @@
 #if defined(HAVE_KERNEL_FPU_API_HEADER)
 #include <asm/fpu/api.h>
 #include <asm/fpu/internal.h>
+#if defined(HAVE_KERNEL_FPU_XCR_HEADER)
+#include <asm/fpu/xcr.h>
+#endif
 #else
 #include <asm/i387.h>
 #include <asm/xcr.h>

include/os/linux/kernel/linux/vfs_compat.h

@@ -343,7 +343,8 @@ static inline void zfs_gid_write(struct inode *ip, gid_t gid)
 /*
  * 4.9 API change
  */
-#ifndef HAVE_SETATTR_PREPARE
+#if !(defined(HAVE_SETATTR_PREPARE_NO_USERNS) || \
+    defined(HAVE_SETATTR_PREPARE_USERNS))
 static inline int
 setattr_prepare(struct dentry *dentry, struct iattr *ia)
 {
@@ -389,6 +390,15 @@ func(const struct path *path, struct kstat *stat, u32 request_mask,	\
 {									\
 	return (func##_impl(path, stat, request_mask, query_flags));	\
 }
+#elif defined(HAVE_USERNS_IOPS_GETATTR)
+#define	ZPL_GETATTR_WRAPPER(func)					\
+static int								\
+func(struct user_namespace *user_ns, const struct path *path,	\
+    struct kstat *stat, u32 request_mask, unsigned int query_flags)	\
+{									\
+	return (func##_impl(user_ns, path, stat, request_mask, \
+	    query_flags));	\
+}
 #else
 #error
 #endif
@@ -436,4 +446,16 @@ zpl_is_32bit_api(void)
 #endif
 }
 
+/*
+ * 5.12 API change
+ * To support id-mapped mounts, generic_fillattr() was modified to
+ * accept a new struct user_namespace* as its first arg.
+ */
+#ifdef HAVE_GENERIC_FILLATTR_USERNS
+#define	zpl_generic_fillattr(user_ns, ip, sp)	\
+    generic_fillattr(user_ns, ip, sp)
+#else
+#define	zpl_generic_fillattr(user_ns, ip, sp)	generic_fillattr(ip, sp)
+#endif
+
 #endif /* _ZFS_VFS_H */

include/os/linux/kernel/linux/xattr_compat.h

@@ -119,12 +119,27 @@ fn(struct dentry *dentry, const char *name, void *buffer, size_t size,	\
 #error "Unsupported kernel"
 #endif
 
+/*
+ * 5.12 API change,
+ * The xattr_handler->set() callback was changed to take the
+ * struct user_namespace* as the first arg, to support idmapped
+ * mounts.
+ */
+#if defined(HAVE_XATTR_SET_USERNS)
+#define	ZPL_XATTR_SET_WRAPPER(fn)					\
+static int								\
+fn(const struct xattr_handler *handler, struct user_namespace *user_ns, \
+    struct dentry *dentry, struct inode *inode, const char *name,	\
+    const void *buffer, size_t size, int flags)	\
+{									\
+	return (__ ## fn(inode, name, buffer, size, flags));		\
+}
 /*
  * 4.7 API change,
  * The xattr_handler->set() callback was changed to take a both dentry and
  * inode, because the dentry might not be attached to an inode yet.
  */
-#if defined(HAVE_XATTR_SET_DENTRY_INODE)
+#elif defined(HAVE_XATTR_SET_DENTRY_INODE)
 #define	ZPL_XATTR_SET_WRAPPER(fn)					\
 static int								\
 fn(const struct xattr_handler *handler, struct dentry *dentry,		\

include/os/linux/spl/sys/cmn_err.h

@@ -24,7 +24,11 @@
 #ifndef _SPL_CMN_ERR_H
 #define	_SPL_CMN_ERR_H
 
+#if defined(_KERNEL) && defined(HAVE_STANDALONE_LINUX_STDARG)
+#include <linux/stdarg.h>
+#else
 #include <stdarg.h>
+#endif
 
 #define	CE_CONT		0 /* continuation */
 #define	CE_NOTE		1 /* notice */

include/os/linux/spl/sys/debug.h

@@ -68,9 +68,9 @@ void spl_dumpstack(void);
 	    "%s", "VERIFY(" #cond ") failed\n"))
 
 #define	VERIFY3B(LEFT, OP, RIGHT)	do {					\
-		boolean_t _verify3_left = (boolean_t)(LEFT);		\
+		const boolean_t _verify3_left = (boolean_t)(LEFT);	\
-		boolean_t _verify3_right = (boolean_t)(RIGHT);		\
+		const boolean_t _verify3_right = (boolean_t)(RIGHT);\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%d " #OP " %d)\n",						\
@@ -79,9 +79,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY3S(LEFT, OP, RIGHT)	do {					\
-		int64_t _verify3_left = (int64_t)(LEFT);		\
+		const int64_t _verify3_left = (int64_t)(LEFT);		\
-		int64_t _verify3_right = (int64_t)(RIGHT);		\
+		const int64_t _verify3_right = (int64_t)(RIGHT);	\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%lld " #OP " %lld)\n",					\
@@ -90,9 +90,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY3U(LEFT, OP, RIGHT)	do {					\
-		uint64_t _verify3_left = (uint64_t)(LEFT);		\
+		const uint64_t _verify3_left = (uint64_t)(LEFT);	\
-		uint64_t _verify3_right = (uint64_t)(RIGHT);		\
+		const uint64_t _verify3_right = (uint64_t)(RIGHT);	\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%llu " #OP " %llu)\n",					\
@@ -101,9 +101,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY3P(LEFT, OP, RIGHT)	do {					\
-		uintptr_t _verify3_left = (uintptr_t)(LEFT);		\
+		const uintptr_t _verify3_left = (uintptr_t)(LEFT);	\
-		uintptr_t _verify3_right = (uintptr_t)(RIGHT);		\
+		const uintptr_t _verify3_right = (uintptr_t)(RIGHT);\
-		if (!(_verify3_left OP _verify3_right))			\
+		if (unlikely(!(_verify3_left OP _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(" #LEFT " "  #OP " "  #RIGHT ") "		\
 		    "failed (%px " #OP " %px)\n",					\
@@ -112,9 +112,9 @@ void spl_dumpstack(void);
 	} while (0)
 
 #define	VERIFY0(RIGHT)	do {								\
-		int64_t _verify3_left = (int64_t)(0);		\
+		const int64_t _verify3_left = (int64_t)(0);			\
-		int64_t _verify3_right = (int64_t)(RIGHT);		\
+		const int64_t _verify3_right = (int64_t)(RIGHT);	\
-		if (!(_verify3_left == _verify3_right))			\
+		if (unlikely(!(_verify3_left == _verify3_right)))	\
 		    spl_panic(__FILE__, __FUNCTION__, __LINE__,		\
 		    "VERIFY3(0 == " #RIGHT ") "						\
 		    "failed (0 == %lld)\n",							\
@@ -154,11 +154,11 @@ void spl_dumpstack(void);
 #define	ASSERT0		VERIFY0
 #define	ASSERT		VERIFY
 #define	IMPLY(A, B) \
-	((void)(((!(A)) || (B)) || \
+	((void)(likely((!(A)) || (B)) || \
 	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
 	    "(" #A ") implies (" #B ")")))
 #define	EQUIV(A, B) \
-	((void)((!!(A) == !!(B)) || \
+	((void)(likely(!!(A) == !!(B)) || \
 	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
 	    "(" #A ") is equivalent to (" #B ")")))
 /* END CSTYLED */

include/os/linux/spl/sys/signal.h

@@ -33,22 +33,6 @@
 #define	FORREAL		0	/* Usual side-effects */
 #define	JUSTLOOKING	1	/* Don't stop the process */
 
-/*
+extern int issig(int why);
- * The "why" argument indicates the allowable side-effects of the call:
- *
- * FORREAL:  Extract the next pending signal from p_sig into p_cursig;
- * stop the process if a stop has been requested or if a traced signal
- * is pending.
- *
- * JUSTLOOKING:  Don't stop the process, just indicate whether or not
- * a signal might be pending (FORREAL is needed to tell for sure).
- */
-static __inline__ int
-issig(int why)
-{
-	ASSERT(why == FORREAL || why == JUSTLOOKING);
-
-	return (signal_pending(current));
-}
 
 #endif /* SPL_SIGNAL_H */

include/os/linux/spl/sys/thread.h

@@ -70,4 +70,17 @@ extern struct task_struct *spl_kthread_create(int (*func)(void *),
 
 extern proc_t p0;
 
+#ifdef HAVE_SIGINFO
+typedef kernel_siginfo_t spl_kernel_siginfo_t;
+#else
+typedef siginfo_t spl_kernel_siginfo_t;
+#endif
+
+#ifdef HAVE_SET_SPECIAL_STATE
+#define	spl_set_special_state(x) set_special_state((x))
+#else
+#define	spl_set_special_state(x) __set_current_state((x))
+#endif
+
+
 #endif  /* _SPL_THREAD_H */