From bb232821faf5fa92e0672e184af42199b6e6f721 Mon Sep 17 00:00:00 2001 From: Jeff Moyer Date: Wed, 5 Feb 2020 14:15:58 -0500 Subject: [PATCH] dax: pass NOWAIT flag to iomap_apply [ Upstream commit 96222d53842dfe54869ec4e1b9d4856daf9105a2 ] 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 Reviewed-by: Christoph Hellwig Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/x49r1z86e1d.fsf@segfault.boston.devel.redhat.com Signed-off-by: Dan Williams Signed-off-by: Sasha Levin --- fs/dax.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/dax.c b/fs/dax.c index 2cc43cd914eb..cc56313c6b3b 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1207,6 +1207,9 @@ 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);