On Wed, Jun 14, 2017 at 3:46 AM, Jan Kara <[email protected]> wrote: > On Fri 09-06-17 13:24:56, 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. >> >> Cc: Jan Kara <[email protected]> >> Cc: Jeff Moyer <[email protected]> >> Cc: Christoph Hellwig <[email protected]> >> Cc: Matthew Wilcox <[email protected]> >> Cc: Ross Zwisler <[email protected]> >> Signed-off-by: Dan Williams <[email protected]> > > ... > >> - dax_flush(dax_dev, pgoff, kaddr, size); >> + if (test_bit(QUEUE_FLAG_WC, &bdev->bd_queue->queue_flags)) >> + dax_flush(dax_dev, pgoff, kaddr, size); > > IMHO the check belongs into dax_flush() similarly as blkdev_issue_flush() > takes silently handles whether the flush is actually needed or not.
Looks good, will do. -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
