• FUJITA Tomonori's avatar
    block: restore the meaning of rq->data_len to the true data length · 7a85f889
    FUJITA Tomonori authored
    The meaning of rq->data_len was changed to the length of an allocated
    buffer from the true data length. It breaks SG_IO friends and
    bsg. This patch restores the meaning of rq->data_len to the true data
    length and adds rq->extra_len to store an extended length (due to
    drain buffer and padding).
    
    This patch also removes the code to update bio in blk_rq_map_user
    introduced by the commit 40b01b9b.
    The commit adjusts bio according to memory alignment
    (queue_dma_alignment). However, memory alignment is NOT padding
    alignment. This adjustment also breaks SG_IO friends and bsg. Padding
    alignment needs to be fixed in a proper way (by a separate patch).
    Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    Signed-off-by: default avatarJens Axboe <axboe@carl.home.kernel.dk>
    7a85f889
blkdev.h 25.9 KB