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So is this all safe > if we are dealing with a zoned block device that also supports atomic writes ? > Not that I know of any such device, but better be safe, so maybe for now do not > enable atomic write support on zoned devices ? I don't think that we need to do anything specific there. Patch 1/6 catches if the chunk size is less than the atomic write max size. Having said that, if a zoned device did support atomic writes then it would be very odd to have its atomic write max size > zone size anyway. Thanks, John