Re: [PATCH] dm: dm-cache fails to write the cache device inwritethrough mode

From: Ben Hutchings
Date: Fri Mar 22 2013 - 16:22:25 EST

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@xxxxxxxxxx>
> ---

This is not the correct way to submit a change to stable. See


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

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