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gs201: add script to convert persist to f2fs

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Currently the persist partition is formatted as ext4. In order to
convert the partition to f2fs without losing data, add a script which
will copy the partition contents out, format the partition as f2fs and
then copy the contents back.

Bug: 202511062
Signed-off-by: Konstantin Vyshetsky <vkon@google.com>
Change-Id: I89502694d1e02261902525c11ac875dd7756721b
This commit is contained in:
Konstantin Vyshetsky 2021-10-11 16:34:03 -07:00 • committed by Jaegeuk Kim
parent e8d42059e6
commit 7b4f21e81d
3 changed files with 87 additions and 0 deletions
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81
convert_to_f2fs.sh Normal file
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#!/bin/sh
BLK=$1
FORMAT_ONLY=$2
MNT_OLD="/mnt/convert_old"
MNT_NEW="/mnt/convert_new"
function log() {
if [ ! -z "$1" ]; then
echo "partition_convert: $1" > /dev/kmsg
fi
}
function check_success() {
if [ $? -ne 0 ]; then
log "Failed: $1"
exit -1
fi
log "Success: $1"
}
F2FS_MAGIC=$(xxd $BLK -s 0x400 -l 4 -p)
if [ "$F2FS_MAGIC" = "1020f5f2" ]; then
log "$BLK is already f2fs - skipping"
exit 0
fi
EXT4_MAGIC=$(xxd $BLK -s 0x438 -l 2 -p)
if [ "$EXT4_MAGIC" != "53ef" ]; then
log "Unknown filesystem $EXT4_MAGIC"
exit -1
fi
if [ $FORMAT_ONLY == "true" ]; then
make_f2fs $BLK 2>&1 > /dev/null
check_success "make_f2fs $BLK"
sync
check_success "sync"
exit 0
fi
mkdir -p $MNT_OLD
check_success "mkdir $MNT_OLD"
mkdir -p $MNT_NEW
check_success "mkdir $MNT_NEW"
mount -t ext4 $BLK $MNT_OLD
check_success "mount $MNT_OLD as ext4"
mount -t tmpfs tmpfs $MNT_NEW
check_success "mount $MNT_NEW as tmpfs"
cp -rp $MNT_OLD/* $MNT_NEW/
check_success "copy $MNT_OLD to $MNT_NEW"
umount $MNT_OLD
check_success "umount $MNT_OLD"
make_f2fs $BLK 2>&1 > /dev/null
check_success "make_f2fs $BLK"
mount -t f2fs $BLK $MNT_OLD
check_success "mount $MNT_OLD as f2fs"
cp -rp $MNT_NEW/* $MNT_OLD/
check_success "copy $MNT_NEW to $MNT_OLD"
sync
check_success "sync"
umount $MNT_OLD
check_success "umount $MNT_OLD"
umount $MNT_NEW
check_success "umount $MNT_NEW"
rmdir $MNT_OLD
check_success "rmdir $MNT_OLD"
rmdir $MNT_NEW
check_success "rmdir $MNT_NEW"