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Re: [dm-devel] [PATCH RFC 00/10] dm-dedup: device-mapper deduplication target



On 04/29/14 00:03, Vasily Tarasov wrote:
> See the documentation patch for more details.

Regarding that documentation: shouldn't the on-disk data structures be
documented ? Shouldn't it be documented how dm-dedup recovers from a
power failure ? Since different storage devices are used for data and
meta-data recovery from a power failure is nontrivial. How is it e.g.
guaranteed if a data block has been made persistent (e.g. via REQ_FUA)
and the refcount is increased for that data block that neither the data
nor the metadata for that data block is lost if a power failure occurs ?

Bart.


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