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BLKFLSBUF is not supposed to actually send a flush command to the device, but to tear down buffer cache structures. Remove the mtd_blkdevs implementation and just use the default semantics instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Richard Weinberger <richard@nod.at> Signed-off-by: Jens Axboe <axboe@kernel.dk>