ext4 dedup write fail

From topjohnwu

https://twitter.com/topjohnwu/status/1170443615077666816

I found out that Android 10's system images are formatted with EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS. It will deduplicate blocks in the filesystem to 
reduce the image size. On my Pixel XL, the partition is physically not large enough to successfully run 'e2fsck -E unshare_blocks'.

So simply put, ext4 dedup can be undo to ordinary ext4 fs by below:

e2fsck -f system.img
resizefs system.img 1G
e2fsck -E unshare_blocks