uvol: improve autopart and lvm scripts, fix F2FS volumes

Use sfdisk to get GPT partition by name as partition names are not
known by the kernel if added via partx.
Make sure physical volume names are unique, if possible correlate
with the disks serial number and/or card's cid.
mkf2fs apparently returns 134 even in case format succeeded, so don't
fail in that case (this fixes rw volumes large enough for F2FS to be
selected by the lvm scripts of uvol).

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

utils/uvol/files/autopart.defaults

@@ -2,9 +2,29 @@
 
 . /lib/functions.sh
 . /lib/upgrade/common.sh
+. /usr/share/libubox/jshn.sh
 
 OWRT_VOLUMES=owrt-volumes
 
+
+get_partition_by_name_gpt() {
+	local dev="$1"
+	local part parts node name
+	json_load "$(sfdisk -J "/dev/$dev" 2>/dev/null)"
+	json_select "partitiontable" || return
+	json_select "partitions" || return
+	json_get_keys parts
+	for part in $parts; do
+		json_select "$part"
+		json_get_vars node name
+		if [ "$2" = "$name" ]; then
+			echo "$node"
+			break
+		fi
+		json_select ..
+	done
+}
+
 part_fixup() {
 	echo "write" | sfdisk --force -q -w never $1
 }
@@ -57,20 +77,22 @@ lvm_init() {
 autopart_init() {
 	local diskdev
 	local lvmpart
-	local diskserial
+	local diskserial diskhash
 
 	export_bootdevice && export_partdevice diskdev 0
 
 	[ "$diskdev" ] || return
 
-	[ -e "/sys/class/block/$diskdev/device/serial" ] && diskserial=$(cat /sys/class/block/$diskdev/device/serial)
-
+	[ -e "/sys/class/block/$diskdev/device/serial" ] && diskserial="$(cat /sys/class/block/$diskdev/device/serial)"
+	[ -e "/sys/class/block/$diskdev/device/cid" ] && diskserial="$diskserial$(cat /sys/class/block/$diskdev/device/cid)"
+	[ "$diskserial" ] || diskserial="$(cat /proc/sys/kernel/random/uuid)"
+	diskhash="$(echo $diskserial | sha256sum | cut -d' ' -f1)"
 	part_fixup /dev/$diskdev
 	create_lvm_part /dev/$diskdev || return
-	lvmpart=$(get_partition_by_name $diskdev $OWRT_VOLUMES)
+	lvmpart=$(get_partition_by_name_gpt $diskdev $OWRT_VOLUMES)
 
 	[ "$lvmpart" ] || return
-	lvm_init /dev/$lvmpart "${OWRT_VOLUMES}${diskserial:+-${diskserial:2}}"
+	lvm_init $lvmpart "${OWRT_VOLUMES}-${diskhash:0:16}"
 }
 
 autopart_init

utils/uvol/files/lvm.sh

@@ -231,7 +231,9 @@ createvol() {
 	[ "$lv_full_name" ] || return 22
 	lvm_cmd lvchange -a y "$lv_full_name" || return 1
 	if [ $lv_size -gt $(( 100 * 1024 * 1024 )) ]; then
-		mkfs.f2fs -f -l "$1" "$lv_path" || return 1
+		mkfs.f2fs -f -l "$1" "$lv_path"
+		ret=$?
+		[ $ret != 0 ] && [ $ret != 134 ] && return 1
 	else
 		mke2fs -F -L "$1" "$lv_path" || return 1
 	fi
@@ -271,7 +273,7 @@ listvols() {
 	local reports rep lv lvs lv_name lv_size lv_mode volname
 	volname=${1:-.*}
 	json_init
-	json_load "$(lvs -o lv_name,lv_size -S "lv_name=~^[rw][ow]_$volname\$ && vg_name=$vg_name")"
+	json_load "$(lvs -o lv_name,lv_size -S "lv_name=~^[rw][owp]_$volname\$ && vg_name=$vg_name")"
 	json_select report
 	json_get_keys reports
 	for rep in $reports; do