On 09/01/2010 03:54 PM, Mike Snitzer wrote: >> It just doesn't happen anymore. If the underlying device doesn't >> support FLUSH/FUA, the block layer simply make those parts noop. IOW, >> it no longer distinguishes between writeback cache which doesn't >> support cache flush at all and writethrough cache. Devices which have >> WB cache w/o flush very difficult to come by these days and there's >> nothing much we can do anyway, so it doesn't make sense to require >> everyone to implement -EOPNOTSUPP. >> >> One scheduled feature is to implement falling back to REQ_FLUSH when >> the device advertises REQ_FUA but fails to process it, but one way or >> the other, the goal is encapsulating REQ_FLUSH/FUA support in block >> layer proper. If FLUSH/FUA can be retried using a different strategy, >> it should be done inside request_queue proper instead of pushing retry >> logic to all its users. > > OK, so maybe add this info to the patch header one of the primary > FLUSH+FUA conversion patches? Sure. Thanks. -- tejun -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
