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#!/bin/sh
PERSIST_BLK='/dev/block/by-name/persist'
EFS_BLK='/dev/block/by-name/efs'
MNT_BASE='/mnt/product'
MNT_OLD="$MNT_BASE/convert_old"
MNT_NEW="$MNT_BASE/convert_new"
function log() {
if [ ! -z "$1" ]; then
echo "partition_convert: $1" > /dev/kmsg
fi
}
function check_success() {
RES=$?
if [ $RES -ne 0 ]; then
log "Failed: $1"
else
log "Success: $1"
fi
return $RES
}
function get_fs_type()
{
BLOCK=$1
EXT4_MAGIC=$(xxd $BLOCK -s 0x438 -l 2 -p)
if [ "$EXT4_MAGIC" = "53ef" ]; then
echo "ext4"
else
F2FS_MAGIC=$(xxd $BLOCK -s 0x400 -l 4 -p)
if [ "$F2FS_MAGIC" = "1020f5f2" ]; then
echo "f2fs"
else
echo "unknown"
fi
fi
}
# Flow:
# 1. If persist is f2fs we need to make efs ext4 and copy out the files. Once files are copied
# successfully, format persist as ext4 to mark completion of step.
# 2. If persist is ext4 and efs is ext4, we need to copy from efs to persist (use dd). Once
# everything is copied successfully, erase efs to allow it to be formatted to f2fs later.
# 3. If persist is ext4 and efs is not ext4, we have already migrated - do nothing.
# If persist is already ext4 and efs is not ext4 we have already migrated.
PERSIST_FS=$(get_fs_type $PERSIST_BLK)
EFS_FS=$(get_fs_type $EFS_BLK)
if [ "$PERSIST_FS" = "ext4" ]; then
if [ "$EFS_FS" != "ext4" ]; then
log "persist ext4 migration already done"
exit 0
fi
fi
if [ "$PERSIST_FS" = "unknown" ]; then
log "persist partition hasn't been initialized"
exit 0
fi
RETRIES=10
while [[ $RETRIES -gt 0 ]]; do
# Sleep for 1 second here, as other failure points will trigger continue
sleep 1
RETRIES=$((RETRIES-1))
# If persist is still f2fs, we need to copy to efs.
if [ "$PERSIST_FS" = "f2fs" ]; then
# Format efs as ext4
/system/bin/mke2fs -t ext4 -b 4096 $EFS_BLK
check_success "/system/bin/mke2fs -t ext4 -b 4096 $EFS_BLK"
if [ $? -ne 0 ]; then
continue
fi
#Create directory to mount persist partition
mkdir -p $MNT_OLD
check_success "mkdir $MNT_OLD"
if [ $? -ne 0 ]; then
continue
fi
# Create directory to mount efs partition
mkdir -p $MNT_NEW
check_success "mkdir $MNT_NEW"
if [ $? -ne 0 ]; then
rm -rf $MNT_OLD
continue
fi
# Mount persist
mount -t f2fs $PERSIST_BLK $MNT_OLD
check_success "mount -t f2fs $PERSIST_BLK $MNT_OLD"
if [ $? -ne 0 ]; then
rm -rf $MNT_NEW
rm -rf $MNT_OLD
continue
fi
# Mount efs
mount -t ext4 $EFS_BLK $MNT_NEW
check_success "mount -t ext4 $EFS_BLK $MNT_NEW"
if [ $? -ne 0 ]; then
umount $MNT_OLD
rm -rf $MNT_NEW
rm -rf $MNT_OLD
continue
fi
cp -rp $MNT_OLD/.* $MNT_NEW/
cp -rp $MNT_OLD/* $MNT_NEW/
check_success "cp -rp $MNT_OLD/* $MNT_NEW/"
if [ $? -ne 0 ]; then
umount $MNT_NEW
umount $MNT_OLD
rm -rf $MNT_NEW
rm -rf $MNT_OLD
continue
fi
# Calculate md5sum of all files and compare between persist and efs
(cd $MNT_NEW; find . -type f | xargs md5sum | sort) > $MNT_BASE/new.md5sums
(cd $MNT_OLD; find . -type f | xargs md5sum | sort) > $MNT_BASE/old.md5sums
diff $MNT_BASE/new.md5sums $MNT_BASE/old.md5sums
check_success "diff $MNT_BASE/new.md5sums $MNT_BASE/old.md5sums"
RES=$?
rm $MNT_BASE/new.md5sums $MNT_BASE/old.md5sums
umount $MNT_NEW
umount $MNT_OLD
rm -rf $MNT_NEW
rm -rf $MNT_OLD
if [ $RES -ne 0 ]; then
continue
fi
/system/bin/mke2fs -t ext4 -b 4096 $PERSIST_BLK
check_success "/system/bin/mke2fs -t ext4 -b 4096 $PERSIST_BLK"
if [ $? -ne 0 ]; then
continue
fi
PERSIST_FS="ext4"
fi
# copy efs to persist
dd if=$EFS_BLK of=$PERSIST_BLK
check_success "dd if=$EFS_BLK of=$PERSIST_BLK"
if [ $? -ne 0 ]; then
continue
fi
sync
check_success "sync"
if [ $? -ne 0 ]; then
continue
fi
# compare md5sum for integrity
EFS_MD5SUM=$(dd if=$EFS_BLK 2>/dev/null | md5sum)
PERSIST_MD5SUM=$(dd if=$PERSIST_BLK 2>/dev/null | md5sum)
if [ "$PERSIST_MD5SUM" != "$EFS_MD5SUM" ]; then
log "dd md5sum mismatch"
continue
fi
dd if=/dev/zero of=$EFS_BLK bs=1M count=64
check_success "dd if=/dev/zero of=$EFS_BLK bs=1M count=64"
if [ $? -ne 0 ]; then
continue
fi
log "Migration succeeded"
break
done
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