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This introduces the flag FMODE_BUF_WASYNC. If devices support async buffered writes, this flag can be set. It also modifies the check in generic_write_checks to take async buffered writes into consideration. Signed-off-by: Stefan Roesch <shr@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20220623175157.1715274-8-shr@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>