On Tue, Mar 23, 2021 at 06:39:49PM +0000, fdman...@kernel.org wrote: > From: Filipe Manana <fdman...@suse.com> > > If we reflink to or from a file opened with O_SYNC/O_DSYNC or to/from a > file that has the S_SYNC attribute set, we totally ignore that and do not > durably persist the reflink changes. Since a reflink can change the data > readable from a file (and mtime/ctime, or a file size), it makes sense to > durably persist (fsync) the source and destination files/ranges. > > This was previously discussed at: > > https://lore.kernel.org/linux-btrfs/20200903035225.GJ6090@magnolia/ > > The recently introduced test case generic/628, from fstests, exercises > these scenarios and currently fails without this change. > > So make sure we fsync the source and destination files/ranges when either > of them was opened with O_SYNC/O_DSYNC or has the S_SYNC attribute set, > just like XFS already does. > > Signed-off-by: Filipe Manana <fdman...@suse.com>
Added to misc-next, thanks.