diff options
Diffstat (limited to 'convert_to_ext4.sh')
-rw-r--r-- | convert_to_ext4.sh | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/convert_to_ext4.sh b/convert_to_ext4.sh new file mode 100644 index 0000000..244d86b --- /dev/null +++ b/convert_to_ext4.sh @@ -0,0 +1,176 @@ +#!/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/ + 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_NEW/md5sums + (cd $MNT_OLD; find . -type f | xargs md5sum | sort) > $MNT_OLD/md5sums + diff -q $MNT_NEW/md5sums $MNT_OLD/md5sums + check_success "diff -q $MNT_NEW/md5sums $MNT_OLD/md5sums" + RES=$? + + 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 |