block: disable discard request merge temporarily
The SCSI discard request merge never worked, and looks no solution for in future, let's disable it temporarily. Signed-off-by: NShaohua Li <shli@fusionio.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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