[Yaffs] how to determin a chunk wrote correctly?

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Author: EzioZhang
Date:  
To: yaffs
Subject: [Yaffs] how to determin a chunk wrote correctly?
As subject,if I wrote something to one chunk,but powerloss before write
complete. As a result,I could not determin weather this chunk wrote
correctly?

For example,the first 2048byte is wrote correctly,but the last few byte of
the OOB area does not write,how can I cope with this situation?