On Tue, May 02, 2017 at 05:03:45PM +0200, Jan Kara wrote: > Commit b685d3d65ac7 "block: treat REQ_FUA and REQ_PREFLUSH as > synchronous" removed REQ_SYNC flag from WRITE_FUA implementation. > generic_make_request_checks() however strips REQ_FUA flag from a bio > when the storage doesn't report volatile write cache and thus write > effectively becomes asynchronous which can lead to performance > regressions. This affects superblock writes for ext4. Fix the problem > by marking superblock writes always as synchronous. > > Fixes: b685d3d65ac791406e0dfd8779cc9b3707fea5a3 > CC: linux-ext4@xxxxxxxxxxxxxxx > CC: "Theodore Ts'o" <tytso@xxxxxxx> > Signed-off-by: Jan Kara <jack@xxxxxxx> Thanks, applied. - Ted
