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[ Upstream commitc024b226a4] Submit I/O requests with the IOCB_NOWAIT flag set only if the underlying filesystem supports it. Fixes:50a909db36("nvmet: use IOCB_NOWAIT for file-ns buffered I/O") Signed-off-by: Maurizio Lombardi <mlombard@redhat.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sasha Levin <sashal@kernel.org>