[dm-devel] dm-cache: dirty state of blocks in writethrough mode

[Heinz Mauelshagen]

On 07/23/2013 08:44 AM, Vijarnia, Anil wrote:
> Hello,
> In Documentation/cache.txt, section 'Updating on-disk metadata' mentions that "If the system crashes all cache blocks will be assumed dirty when restarted".
> I am assuming that the above line is relevant for writeback mode only, and in writethrough mode the cache will always be coherent after a crash.
> Can someone confirm/reject this assumption?

That's correct

Reason being that the cache never holds any dirty pages in writethrough 
mode.

-- lvmguy

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