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

[Ben Hutchings]

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 at oracle.com>
> ---
[...]

This is not the correct way to submit a change to stable.  See
Documentation/stable_kernel_rules.txt

Ben.

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