static int mem_block_no_elevator_request_fn(request_queue_t* q,struct bio* bio)
{
int status = 0,i = 0;
struct bio_vec* bvec = NULL;
bio_for_each_segment(bvec,bio,i)
{
char* buffer = __bio_kmap_atomic(bio,i,KM_USER0);
switch(bio_data_dir(bio))
{
case WRITE:
{
memcpy(g_mem_buf + (bio->bi_sector << 9),buffer,bio_cur_sectors(bio) << 9);
status = 0;
break;
}
case READ:
{
memcpy(buffer,g_mem_buf + (bio->bi_sector << 9),bio_cur_sectors(bio) << 9);
status = 0;
break;
}
default:
{
Log("[Error] Unknown opetator.");
status = -EIO;
break;
}
}
bio_endio(bio,bio->bi_size,status);
__bio_kunmap_atomic(bio,KM_USER0);
}
/*
* Transfer a single BIO.
*/
static int sbull_xfer_bio(struct sbull_dev *dev, struct bio *bio)
{
int i;
struct bio_vec *bvec;
sector_t sector = bio->bi_sector;
/* Do each segment independently. */
bio_for_each_segment(bvec, bio, i) {
char *buffer = __bio_kmap_atomic(bio, i, KM_USER0);
sbull_transfer(dev, sector, bio_cur_sectors(bio),
buffer, bio_data_dir(bio) == WRITE);
sector += bio_cur_sectors(bio);
__bio_kunmap_atomic(bio, KM_USER0);
}
void blk_recalc_rq_sectors(struct request *rq, int nsect)
{
if (blk_fs_request(rq) || blk_discard_rq(rq)) {
rq->hard_sector += nsect;
rq->hard_nr_sectors -= nsect;
/*
* Move the I/O submission pointers ahead if required.
*/
if ((rq->nr_sectors >= rq->hard_nr_sectors) &&
(rq->sector <= rq->hard_sector)) {
rq->sector = rq->hard_sector;
rq->nr_sectors = rq->hard_nr_sectors;
rq->hard_cur_sectors = bio_cur_sectors(rq->bio);
rq->current_nr_sectors = rq->hard_cur_sectors;
rq->buffer = bio_data(rq->bio);
}
/*
* if total number of sectors is less than the first segment
* size, something has gone terribly wrong
*/
if (rq->nr_sectors < rq->current_nr_sectors) {
printk(KERN_ERR "blk: request botched\n");
rq->nr_sectors = rq->current_nr_sectors;
}
}
}
static int brd_make_request(struct request_queue *q, struct bio *bio)
{
struct brd_device * brd = q->queuedata;
int i, status;
struct bio_vec *bvec;
sector_t sector = bio->bi_sector;
//spin_lock(&brd->brd_lock);
/* Do each segment independently. */
bio_for_each_segment(bvec, bio, i)
{
char *buffer = __bio_kmap_atomic(bio, i, KM_USER0);
brd_transfer(brd, sector, bio_cur_sectors(bio), buffer, bio_data_dir(bio) == WRITE);
sector += bio_cur_sectors(bio);
__bio_kunmap_atomic(bio, KM_USER0);
}
