On Fri, Mar 22, 2013 at 01:11:51PM -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. If this needs doing here, please use dm_bio_record() and dm_bio_restore(). E.g. Look at how dm-raid1.c does something similar. Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
