On Sun, Jun 18, 2017 at 1:45 AM, Christoph Hellwig <hch@xxxxxx> wrote: > On Fri, Jun 09, 2017 at 01:24:56PM -0700, Dan Williams wrote: >> Some platforms arrange for cpu caches to be flushed on power-fail. On >> those platforms there is no requirement that the kernel track and flush >> potentially dirty cache lines. Given that we still insert entries into >> the radix for locking purposes this patch only disables the cache flush >> loop, not the dirty tracking. >> >> Userspace can override the default cache setting via the block device >> queue "write_cache" attribute in sysfs. > > NAK. Please stop using the block infrastructure for dax values. Have > your own flag and sysfs file in the dax infrastructure and only propagate > it to the block layer for the block devices using dax. Ok, that makes sense.
