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Re: [dm-devel] [PATCH] dm: dm-cache fails to write the cache device in writethrough mode



On Fri, Mar 22, 2013 at 08:21:56PM +0000, Ben Hutchings wrote:
> On Fri, 2013-03-22 at 13:11 -0700, Darrick J. Wong wrote:
> > The new writethrough strategy for dm-cache issues a bio to the origin device,
> > remaps the bio to the cache device, and issues the bio to the cache device.
> > However, the block layer modifies bi_sector and bi_size, so we need to preserve
> > these or else nothing gets written to the cache (bi_size == 0).  This fixes the
> > problem where someone writes a block through the cache, but a subsequent reread
> > (from the cache) returns old contents.
> > 
> > Signed-off-by: Darrick J. Wong <darrick wong oracle com>
> > ---
> [...]
> 
> This is not the correct way to submit a change to stable.  See
> Documentation/stable_kernel_rules.txt

Frankly, I'm not sure why agk sent the 3.9-fixes pull request to -stable.  7 of
the 10 commits are for dm-cache, and dm-cache is a new feature for 3.9.  I
probably could have dropped -stable from the cc: list when I started
complaining about bugs.  :)

Sorry about the noise.

--D
> 
> Ben.
> 
> -- 
> Ben Hutchings
> Make three consecutive correct guesses and you will be considered an expert.



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