• FUJITA Tomonori's avatar
    block: introduce struct rq_map_data to use reserved pages · 152e283f
    FUJITA Tomonori authored
    This patch introduces struct rq_map_data to enable bio_copy_use_iov()
    use reserved pages.
    
    Currently, bio_copy_user_iov allocates bounce pages but
    drivers/scsi/sg.c wants to allocate pages by itself and use
    them. struct rq_map_data can be used to pass allocated pages to
    bio_copy_user_iov.
    
    The current users of bio_copy_user_iov simply passes NULL (they don't
    want to use pre-allocated pages).
    Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    Cc: Jens Axboe <jens.axboe@oracle.com>
    Cc: Douglas Gilbert <dougg@torque.net>
    Cc: Mike Christie <michaelc@cs.wisc.edu>
    Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
    Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
    152e283f
bsg.c 23.1 KB