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Add iomap buffered write support for RWF_DONTCACHE. If RWF_DONTCACHE is set for a write, mark the folios being written as uncached. Then writeback completion will drop the pages. The write_iter handler simply kicks off writeback for the pages, and writeback completion will take care of the rest. Signed-off-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Link: https://lore.kernel.org/r/20250204184047.356762-2-axboe@kernel.dk Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <brauner@kernel.org>