Let the block device know when sectors can be discarded
[hirofumi@mail.parknet.co.jp: discard _after_ checking for corrupt chains] Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com> Acked-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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