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