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StuartIanNaylorStuartIanNaylor
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‎cvt2f2fs/cvt2f2fs

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#!/bin/bash
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trap '{ stty sane; printf "\n\nAborting\n\n"; exit 1; }' SIGINT SIGTERM
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# Ensure root User
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if [ $(id -u) -ne 0 ]; then
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echo ""
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echo "Must be run as root user: sudo $0"
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echo ""
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exit 1
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fi
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# Delete Profile Script
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if [ -f /etc/profile.d/cvt2f2fs-ps.sh ]; then
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rm /etc/profile.d/cvt2f2fs-ps.sh
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fi
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# Check Init System
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if command -v systemctl > /dev/null && systemctl | grep -q '\-\.mount'; then
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SYSTEMD=1
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elif [ -f /etc/init.d/cron ] && [ ! -h /etc/init.d/cron ]; then
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SYSTEMD=0
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else
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echo ""
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echo "Unrecognized init system"
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echo ""
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exit 1
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fi
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# Get Root Partition
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if [ ${SYSTEMD} -eq 1 ]; then
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ROOT_PART=$(mount | sed -n 's|^/dev/\(.*\) on / .*|\1|p')
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else
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if [ ! -h /dev/root ]; then
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echo ""
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echo "/dev/root does not exist or is not a symlink"
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echo ""
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exit 1
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fi
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ROOT_PART=$(readlink /dev/root)
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fi
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# Install realpath
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realpath --version &> /dev/null
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if [ $? -ne 0 ]; then
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apt-get -y install realpath
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fi
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# Get Program Path
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PGMPATH=$(realpath $0)
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echo ""
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df
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echo ""
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sleep 3
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echo ""
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if [ "$1" = "" ]; then
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echo -n "Ok to convert SD card to F2FS (y/n)? "
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while read -r -n 1 -s answer; do
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if [[ "${answer}" = [yYnN] ]]; then
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echo "${answer}"
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if [[ "${answer}" = [yY] ]]; then
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break
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else
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echo ""
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echo "Aborted"
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echo ""
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exit 1
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fi
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fi
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done
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echo ""
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echo ""
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echo "Convert to F2FS: Phase 1"
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echo ""
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#
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if [ "${ROOT_PART}" = "mmcblk0p2" ]; then
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PARTUUID="$(sed -n 's|^.*root=\(\S\+\)\s.*|\1|p' /boot/cmdline.txt)"
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PARTUUID="${PARTUUID:0:(${#PARTUUID} - 1)}"
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sed -i 's|root=\S\+\s|root=/dev/mmcblk0p2 |' /boot/cmdline.txt
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sed -i "s|$PARTUUID|/dev/mmcblk0p|" /etc/fstab
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else
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echo ""
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echo "Not running from SD card: Can't convert to F2FS"
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echo ""
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exit 1
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fi
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# Update/Upgrade Raspbian
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echo ""
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echo "Updating/Upgrading Raspbian"
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if [ -e /etc/apt/listchanges.conf ]; then
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sed -i 's/frontend=pager/frontend=text/' /etc/apt/listchanges.conf
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fi
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apt-get -y update
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apt-get -y upgrade
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apt-get -y dist-upgrade
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if [ -e /etc/apt/listchanges.conf ]; then
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sed -i 's/frontend=text/frontend=pager/' /etc/apt/listchanges.conf
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fi
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# Create Profile Script
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cat <<EOF > /etc/profile.d/cvt2f2fs-ps.sh &&
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#!/bin/bash
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ps cax | grep cvt2f2fs-ps.sh > /dev/null
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if [[ \$? -ne 0 && \$(id -u) -eq 0 ]]; then
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sudo ${PGMPATH} --phase2
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fi
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EOF
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# Reboot
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shutdown -r now
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elif [ "$1" = "--phase2" ]; then
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echo "Convert to F2FS: Phase 2"
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echo ""
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echo ""
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# Install rsync
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rsync --version &> /dev/null
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if [ $? -ne 0 ]; then
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apt-get -y install rsync
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fi
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apt-get -y install f2fs-tools
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umount /dev/sda1 &> /dev/null
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umount /dev/sda2 &> /dev/null
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echo "Partitioning USB flash drive"
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fdisk /dev/sda <<EOF &> /dev/null
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o
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n
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p
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1
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w
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EOF
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partprobe
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echo "Creating ext4 filesystem on USB flash drive"
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mke2fs -F -q -t ext4 -L rootfs /dev/sda1 &> /dev/null
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echo "Copying root filesystem to USB flash drive (this will take a while)"
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mount /dev/sda1 /mnt
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rsync -ax / /mnt
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sed -i 's|/dev/mmcblk0p2|#/dev/mmcblk0p2|' /mnt/etc/fstab
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echo "/dev/sda1 / ext4 defaults,noatime 0 1" >> /mnt/etc/fstab
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# Create Profile Script
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cat <<EOF > /mnt/etc/profile.d/cvt2f2fs-ps.sh &&
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#!/bin/bash
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ps cax | grep cvt2f2fs-ps.sh > /dev/null
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if [[ \$? -ne 0 && \$(id -u) -eq 0 ]]; then
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sudo ${PGMPATH} --phase3
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fi
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EOF
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umount /mnt
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sed -i 's|root=/dev/mmcblk0p2|root=/dev/sda1|' /boot/cmdline.txt
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sed -i 's|rootwait|rootwait rootdelay=5|' /boot/cmdline.txt
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echo "Rebooting to USB flash drive"
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echo ""
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# Reboot
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shutdown -r now
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elif [ "$1" = "--phase3" ]; then
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echo "Convert to F2FS: Phase 3"
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echo ""
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echo ""
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echo "Creating F2FS filesystem on SD card"
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wipefs --force -a /dev/mmcblk0p2 > /dev/null
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mkfs.f2fs /dev/mmcblk0p2 &> /dev/null
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echo "Copying root filesystem to SD card (this will take a while)"
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mount /dev/mmcblk0p2 /mnt
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rsync -ax / /mnt
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sed -i '/\/dev\/sda1/d' /mnt/etc/fstab
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sed -i 's|#/dev/mmcblk0p2|/dev/mmcblk0p2|' /mnt/etc/fstab
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sed -i 's|ext4|f2fs|' /mnt/etc/fstab
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sed -i 's|defaults,noatime|defaults,noatime,discard|' /mnt/etc/fstab
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# Create Profile Script
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cat <<EOF > /mnt/etc/profile.d/cvt2f2fs-ps.sh &&
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#!/bin/bash
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ps cax | grep cvt2f2fs-ps.sh > /dev/null
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if [[ \$? -ne 0 && \$(id -u) -eq 0 ]]; then
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sudo ${PGMPATH} --phase4
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fi
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EOF
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umount /mnt
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sed -i 's|root=/dev/sda1|root=/dev/mmcblk0p2|' /boot/cmdline.txt
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sed -i 's|rootfstype=ext4|rootfstype=f2fs|' /boot/cmdline.txt
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sed -i 's|rootwait rootdelay=5|rootwait|' /boot/cmdline.txt
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echo "Rebooting to SD card"
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echo ""
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# Reboot
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shutdown -r now
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elif [ "$1" = "--phase4" ]; then
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echo "Convert to F2FS: Phase 4"
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echo ""
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echo ""
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# Cleanup
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apt-get -y autoremove
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apt-get -y clean
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rm -r /boot.bak/ &> /dev/null
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echo ""
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echo "Convert to F2FS Complete"
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echo ""
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fi

‎cvt2f2fs/cvt2f2fs.txt

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The cvt2f2fs script will convert a Raspian ext4 filesystem on an SD card to F2FS.
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!!! MAKE A BACKUP COPY OF THE SD CARD BEFORE ATTEMPTING THIS PROCEDURE !!!
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1. Disconnect all USB devices from the Raspberry Pi.
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2. Connect a USB flash drive with sufficient capacity to hold the SD card contents.
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!!! ALL EXISTING DATA ON THE USB FLASH DRIVE WILL BE DESTROYED !!!
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3. Log in as root
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4. Run ./cvt2f2fs
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5. Log in as root following the reboots which occur at the completion of Phases 1, 2, and 3
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6. When Phase 4 completes, the SD card should be using an F2FS filesystem instead of ext4

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