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Question about the default ext4 settings in lib/debootstrap.sh

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Hey guys.



1. This piece

    if [[ $(lsb_release -sc) =~ bionic|buster|cosmic|disco ]]; then
        mkopts[ext4]='-q -m 2 -O ^64bit,^metadata_csum'
    elif [[ $(lsb_release -sc) == xenial ]]; then
        mkopts[ext4]='-q -m 2'

Why disable metadata_csum?

Why disable 64bit overall, not just for pure 32 bit boards?


2. This piece 

[[ $ROOTFS_TYPE == ext4 ]] && tune2fs -o journal_data_writeback $rootdevice > /dev/null

Why enable journal_data_writeback feature? What are the pros and cons?

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