linux-kernel - [PATCH AUTOSEL 5.4 06/50] dax: pass NOWAIT flag to iomap

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Date:   Sat, 22 Feb 2020 21:21:51 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jeff Moyer <jmoyer@...hat.com>, Christoph Hellwig <hch@....de>,
        Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <sashal@...nel.org>, linux-fsdevel@...r.kernel.org,
        linux-nvdimm@...ts.01.org
Subject: [PATCH AUTOSEL 5.4 06/50] dax: pass NOWAIT flag to iomap_apply

From: Jeff Moyer <jmoyer@...hat.com>

[ 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 <jmoyer@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Jan Kara <jack@...e.cz>
Link: https://lore.kernel.org/r/x49r1z86e1d.fsf@segfault.boston.devel.redhat.com
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/dax.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/dax.c b/fs/dax.c
index 2cc43cd914eb8..cc56313c6b3b9 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);
-- 
2.20.1