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由 Lars Ellenberg 提交于
Discards don't have any payload. But the scsi layer still expects a bio_vec it can use internally, see sd_setup_discard_cmnd() and blk_add_request_payload(). Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com> Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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