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Message-Id: <20200223022339.1885-4-sashal@kernel.org>
Date: Sat, 22 Feb 2020 21:23:18 -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 4.19 04/25] 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 f0d932fa39c20..d09701aa6f2f4 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1301,6 +1301,9 @@ 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
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