Add [-m map] option to zpool_layout

By default the zpool_layout command would always use the slot
number assigned by Linux when generating the zdev.conf file.
This is a reasonable default there are cases when it makes
sense to remap the slot id assigned by Linux using your own
custom mapping.

This commit adds support to zpool_layout to provide a custom
slot mapping file.  The file contains in the first column the
Linux slot it and in the second column the custom slot mapping.
By passing this map file with '-m map' to zpool_config the
mapping will be applied when generating zdev.conf.

Additionally, two sample mapping have been added which reflect
different ways to map the slots in the dragon drawers.

cmd/zpool_layout/zpool_layout

@@ -12,26 +12,30 @@
 # /etc/zfs/zdev.conf file, it allows the by-path naming convertion
 # to change and still keep the simple <channel><rank> naming.
 #
+AWK=${AWK:-/bin/awk}
 CONFIG=${CONFIG:-/etc/zfs/zdev.conf}
 BUSES=( 01 02 03 )
 PORTS=( 4 0 )
 CHANNELS=( A B C D E F G H I J K L M N O P Q R S T U V W X Y Z )
-TRIGGER=
+TRIGGER="no"
+MAPPING=linux
+
 
 usage() {
 	cat << EOF
-Usage: zpool_layout [-th] [-c file] [-b buses] [-p ports] [-n channels]
+Usage: zpool_layout [-th] [-c file] [-b buses] [-p ports] [-n channels] [-m map]
-  -c    Alternate config file [default=/etc/zfs/zdev.conf]
+  -c    Alternate config file [default=${CONFIG}]
-  -b    Enumerate buses [default="01 02 03"]
+  -b    Enumerate buses [default="${BUSES[*]}"]
-  -p    Enumerate ports [default="4 0"]
+  -p    Enumerate ports [default="${PORTS[*]}"]
   -n    Channel names [default="A..Z"]
-  -t    Trigger and wait for udev to settle [default=no]
+  -t    Trigger and wait for udev to settle [default=${TRIGGER}]
+  -m    Slot mapping [default=${MAPPING}]
   -h    Show this message
 EOF
 	exit 0
 }
 
-while getopts 'c:b:p:n:th' OPTION; do
+while getopts 'c:b:p:n:m:th' OPTION; do
 	case ${OPTION} in
 	c)
 		CONFIG=${OPTARG}
@@ -45,8 +49,11 @@ while getopts 'c:b:p:n:th' OPTION; do
 	n)
 		CHANNELS=(${OPTARG})
 		;;
+	m)
+		MAPPING=`readlink -e ${OPTARG}`
+		;;
 	t)
-		TRIGGER=1
+		TRIGGER=yes
 		;;
 	h)
 		usage
@@ -54,11 +61,31 @@ while getopts 'c:b:p:n:th' OPTION; do
 	esac
 done
 
+# Verify mapping file exists if specified.
+# Linux-Slot	Custom-Slot
+if [ ${MAPPING} != "linux" ] && [ ! -e ${MAPPING} ]; then
+	echo "Error: Mapping file '${MAPPING}' does not exist"
+	exit 1
+fi
+
 # Save stdout as fd #8, then redirect stdout to the config file.
 exec 8>&1
 exec >${CONFIG}
 pushd /dev/disk/by-path >/dev/null
 
+map_slot() {
+	local LINUX_SLOT=$1
+	local MAPPED_SLOT=
+
+	if [ ${MAPPING} = "linux" ]; then
+		MAPPED_SLOT=${LINUX_SLOT}
+	else
+		MAPPED_SLOT=`${AWK} "\\$1 == ${LINUX_SLOT} && !/^#/ \
+			{ print \\$2; exit }" $MAPPING`
+	fi
+	printf "%d" ${MAPPED_SLOT}
+}
+
 # Generate comment header.
 echo "#"
 echo "# Custom /dev/disk/by-path to /dev/disk/zpool mapping, "
@@ -98,28 +125,34 @@ done
 echo "#"
 
 # Generate mapping from <channel><rank> to by-path name.
-TMP_FILE=`mktemp`
-AWK=${AWK:-/bin/awk}
-
 for (( i=0, k=0; i<${#BUSES[*]}; i++ )); do
 	for (( j=0; j<${#PORTS[*]}; j++, k++ )); do
-		ls *:${BUSES[$i]}:*:${PORTS[$j]}*  2>/dev/null | \
+		BYPATH=(`ls *:${BUSES[$i]}:*:${PORTS[$j]}* 2>/dev/null | \
-			grep -v part | sort -n -k7 -t'-'>${TMP_FILE}
+			grep -v part | sort -n -k7 -t'-' | cut -f1-6 -d'-'`)
+		SLOTS=(`ls *:${BUSES[$i]}:*:${PORTS[$j]}* 2>/dev/null |  \
+			grep -v part | sort -n -k7 -t'-' | cut -f7 -d'-'`)
+		TMP_FILE=`mktemp`
+
+		for (( l=0; l<${#SLOTS[*]}; l++ )); do
+			MAPPED_SLOT=`map_slot ${SLOTS[$l]}`
+			printf "%s%d\t%s-%d\n" \
+				${CHANNELS[$k]} ${MAPPED_SLOT} \
+				${BYPATH[$l]} ${SLOTS[$l]} >>${TMP_FILE}
+		done
 
 		echo
 		echo -n "# Channel ${CHANNELS[$k]}, "
 		echo "Bus ${BUSES[$i]}, Port ${PORTS[$j]}"
-		${AWK} -F '-' -v ch="${CHANNELS[$k]}" \
+		cat ${TMP_FILE} | sort -n -k2 -t${CHANNELS[$k]}
-			'{print ch$7 "\t" $0 }' ${TMP_FILE}
+		rm -f ${TMP_FILE}
 	done
 done
 
 # Restore stdout from fd #8 and close fd #8.
 exec 1>&8 8>&-
-rm -f ${TMP_FILE}
 popd >/dev/null
 
-if [ ${TRIGGER} ]; then
+if [ ${TRIGGER} = "yes" ]; then
 	udevadm trigger
 	udevadm settle
 fi

configure

@@ -17904,7 +17904,7 @@ fi
 $as_echo "$enable_debug" >&6; }
 
 
-ac_config_files="$ac_config_files Makefile etc/Makefile man/Makefile man/man8/Makefile lib/Makefile lib/libspl/Makefile lib/libspl/asm-generic/Makefile lib/libspl/asm-i386/Makefile lib/libspl/asm-x86_64/Makefile lib/libspl/include/Makefile lib/libspl/include/ia32/Makefile lib/libspl/include/ia32/sys/Makefile lib/libspl/include/rpc/Makefile lib/libspl/include/sys/Makefile lib/libspl/include/sys/sysevent/Makefile lib/libspl/include/sys/dktp/Makefile lib/libspl/include/util/Makefile lib/libavl/Makefile lib/libefi/Makefile lib/libnvpair/Makefile lib/libunicode/Makefile lib/libuutil/Makefile lib/libzpool/Makefile lib/libzfs/Makefile cmd/Makefile cmd/zdb/Makefile cmd/zfs/Makefile cmd/zinject/Makefile cmd/zpool/Makefile cmd/zpool_id/Makefile cmd/zpool_layout/Makefile cmd/ztest/Makefile cmd/zpios/Makefile module/Makefile module/avl/Makefile module/nvpair/Makefile module/unicode/Makefile module/zcommon/Makefile module/zfs/Makefile module/zpios/Makefile include/Makefile include/sys/Makefile include/sys/fs/Makefile include/sys/fm/Makefile include/sys/fm/fs/Makefile scripts/Makefile scripts/zpios-profile/Makefile scripts/zpios-test/Makefile scripts/zpool-config/Makefile scripts/common.sh zfs.spec zfs-modules.spec zfs-script-config.sh"
+ac_config_files="$ac_config_files Makefile etc/Makefile man/Makefile man/man8/Makefile lib/Makefile lib/libspl/Makefile lib/libspl/asm-generic/Makefile lib/libspl/asm-i386/Makefile lib/libspl/asm-x86_64/Makefile lib/libspl/include/Makefile lib/libspl/include/ia32/Makefile lib/libspl/include/ia32/sys/Makefile lib/libspl/include/rpc/Makefile lib/libspl/include/sys/Makefile lib/libspl/include/sys/sysevent/Makefile lib/libspl/include/sys/dktp/Makefile lib/libspl/include/util/Makefile lib/libavl/Makefile lib/libefi/Makefile lib/libnvpair/Makefile lib/libunicode/Makefile lib/libuutil/Makefile lib/libzpool/Makefile lib/libzfs/Makefile cmd/Makefile cmd/zdb/Makefile cmd/zfs/Makefile cmd/zinject/Makefile cmd/zpool/Makefile cmd/zpool_id/Makefile cmd/zpool_layout/Makefile cmd/ztest/Makefile cmd/zpios/Makefile module/Makefile module/avl/Makefile module/nvpair/Makefile module/unicode/Makefile module/zcommon/Makefile module/zfs/Makefile module/zpios/Makefile include/Makefile include/sys/Makefile include/sys/fs/Makefile include/sys/fm/Makefile include/sys/fm/fs/Makefile scripts/Makefile scripts/zpios-profile/Makefile scripts/zpios-test/Makefile scripts/zpool-config/Makefile scripts/zpool-layout/Makefile scripts/common.sh zfs.spec zfs-modules.spec zfs-script-config.sh"
 
 
 cat >confcache <<\_ACEOF
@@ -18869,6 +18869,7 @@ do
     "scripts/zpios-profile/Makefile") CONFIG_FILES="$CONFIG_FILES scripts/zpios-profile/Makefile" ;;
     "scripts/zpios-test/Makefile") CONFIG_FILES="$CONFIG_FILES scripts/zpios-test/Makefile" ;;
     "scripts/zpool-config/Makefile") CONFIG_FILES="$CONFIG_FILES scripts/zpool-config/Makefile" ;;
+    "scripts/zpool-layout/Makefile") CONFIG_FILES="$CONFIG_FILES scripts/zpool-layout/Makefile" ;;
     "scripts/common.sh") CONFIG_FILES="$CONFIG_FILES scripts/common.sh" ;;
     "zfs.spec") CONFIG_FILES="$CONFIG_FILES zfs.spec" ;;
     "zfs-modules.spec") CONFIG_FILES="$CONFIG_FILES zfs-modules.spec" ;;

configure.ac

@@ -103,6 +103,7 @@ AC_CONFIG_FILES([
 	scripts/zpios-profile/Makefile
 	scripts/zpios-test/Makefile
 	scripts/zpool-config/Makefile
+	scripts/zpool-layout/Makefile
 	scripts/common.sh
 	zfs.spec
 	zfs-modules.spec

scripts/Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = zpool-config zpios-test zpios-profile
+SUBDIRS = zpool-config zpool-layout zpios-test zpios-profile
 
 pkglibexecdir = $(libexecdir)/@PACKAGE@
 dist_pkglibexec_SCRIPTS = \

scripts/Makefile.in

@@ -311,7 +311,7 @@ target_vendor = @target_vendor@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-SUBDIRS = zpool-config zpios-test zpios-profile
+SUBDIRS = zpool-config zpool-layout zpios-test zpios-profile
 dist_pkglibexec_SCRIPTS = \
 	$(top_builddir)/scripts/common.sh \
 	$(top_srcdir)/scripts/zconfig.sh \

scripts/zpool-layout/Makefile.am

@@ -0,0 +1,22 @@
+pkglibexecdir = $(libexecdir)/@PACKAGE@/zpool-layout
+dist_pkglibexec_SCRIPTS = \
+	$(top_srcdir)/scripts/zpool-layout/dragon.ddn.conf \
+	$(top_srcdir)/scripts/zpool-layout/dragon.llnl.conf
+
+all:
+	@list='$(dist_pkglibexec_SCRIPTS)'; \
+	for file in $$list; do \
+		link=$$(basename $$file); \
+		if [ ! -e $$link ]; then \
+			$(LN_S) $$file $$link; \
+		fi \
+	done
+
+clean:
+	@list='$(dist_pkglibexec_SCRIPTS)'; \
+	for file in $$list; do \
+		link=$$(basename $$file); \
+		if [ -L $$link ]; then \
+			$(RM) $$link; \
+		fi \
+	done

scripts/zpool-layout/dragon.ddn.conf

@@ -0,0 +1,67 @@
+#
+# Custom DDN slot mapping for zpool_layout command and
+# StorageScaler 6000 enclosures (Dragon Drawer).
+#
+# Linux	DDN
+# Slot	Slot
+#
+1	1
+2	13
+3	25
+4	37
+5	49
+6	2
+7	14
+8	26
+9	38
+10	50
+11	3
+12	15
+13	27
+14	39
+15	51
+16	4
+17	16
+18	28
+19	40
+20	52
+21	5
+22	17
+23	29
+24	41
+25	53
+26	6
+27	18
+28	30
+29	42
+30	54
+31	7
+32	19
+33	31
+34	43
+35	55
+36	8
+37	20
+38	32
+39	44
+40	56
+41	9
+42	21
+43	33
+44	45
+45	57
+46	10
+47	22
+48	34
+49	46
+50	58
+51	11
+52	23
+53	35
+54	47
+55	59
+56	12
+57	24
+58	36
+59	48
+60	60

scripts/zpool-layout/dragon.llnl.conf

@@ -0,0 +1,67 @@
+#
+# Custom LLNL slot mapping for zpool_layout command and
+# StorageScaler 6000 enclosures (Dragon Drawer).
+#
+# Linux	LLNL
+# Slot	Slot
+#
+1	25
+2	19
+3	13
+4	7
+5	1
+6	26
+7	20
+8	14
+9	8
+10	2
+11	27
+12	21
+13	15
+14	9
+15	3
+16	28
+17	22
+18	16
+19	10
+20	4
+21	29
+22	23
+23	17
+24	11
+25	5
+26	30
+27	24
+28	18
+29	12
+30	6
+31	60
+32	54
+33	48
+34	42
+35	36
+36	59
+37	53
+38	47
+39	41
+40	35
+41	58
+42	52
+43	46
+44	40
+45	34
+46	57
+47	51
+48	45
+49	39
+50	33
+51	56
+52	50
+53	44
+54	38
+55	32
+56	55
+57	49
+58	43
+59	37
+60	31