dax: pass NOWAIT flag to iomap_apply

fstests generic/471 reports a failure when run with MOUNT_OPTIONS="-o
dax".  The reason is that the initial pwrite to an empty file with the
RWF_NOWAIT flag set does not return -EAGAIN.  It turns out that
dax_iomap_rw doesn't pass that flag through to iomap_apply.

With this patch applied, generic/471 passes for me.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/x49r1z86e1d.fsf@segfault.boston.devel.redhat.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/fs/dax.c b/fs/dax.c
index 1a64c19..35da144 100644 (file)
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1201,6 +1201,9 @@ dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
                lockdep_assert_held(&inode->i_rwsem);
        }
 
+       if (iocb->ki_flags & IOCB_NOWAIT)
+               flags |= IOMAP_NOWAIT;
+
        while (iov_iter_count(iter)) {
                ret = iomap_apply(inode, pos, iov_iter_count(iter), flags, ops,
                                iter, dax_iomap_actor);