On Wed, May 31 2017 at 3:44am -0400, Jan Kara <[email protected]> wrote: > Commit b685d3d65ac7 "block: treat REQ_FUA and REQ_PREFLUSH as > synchronous" removed REQ_SYNC flag from WRITE_{FUA|PREFLUSH|...} > definitions. generic_make_request_checks() however strips REQ_FUA and > REQ_PREFLUSH flags from a bio when the storage doesn't report volatile > write cache and thus write effectively becomes asynchronous which can > lead to performance regressions > > Fix the problem by making sure all bios which are synchronous are > properly marked with REQ_SYNC. > > CC: Mike Snitzer <[email protected]> > CC: [email protected] > Fixes: b685d3d65ac791406e0dfd8779cc9b3707fea5a3 > CC: [email protected] > Signed-off-by: Jan Kara <[email protected]>
thanks, staged for 4.12-rc4 -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
