/*
* 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;
bool do_sync;
int do_sync_req = 0;
Nand_OS_LOCK();
/* Do each segment independently. */
bio_for_each_segment(bvec, bio, i) //这个是一个宏定义
{
char *buffer = __bio_kmap_atomic(bio, i, KM_USER0);//luowl
#if 1
if(1)//(nand_page_size_get() == 2048)
{
do_sync = (bio_rw_flagged(bio, BIO_RW_SYNCIO) && bio_data_dir(bio) == WRITE);
if (do_sync) {
//printk("detect do write sync\n");
do_sync_req++;
}
}
#endif
sbull_transfer(dev, sector, bio_cur_bytes(bio) >> 9,
buffer, bio_data_dir(bio) == WRITE);
sector += bio_cur_bytes(bio) >> 9;
__bio_kunmap_atomic(bio, KM_USER0);
}
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 vmem_disk_xfer_bio(struct vmem_disk_dev *dev, struct bio *bio)
{
struct bio_vec bvec;
struct bvec_iter iter;
sector_t sector = bio->bi_iter.bi_sector;
bio_for_each_segment(bvec, bio, iter) {
char *buffer = __bio_kmap_atomic(bio, iter);
vmem_disk_transfer(dev, sector, bio_cur_bytes(bio) >> 9,
buffer, bio_data_dir(bio) == WRITE);
sector += bio_cur_bytes(bio) >> 9;
__bio_kunmap_atomic(buffer);
}
/*
* Used for transfering a single bio to a sector. Calls
* osurd_tranfer for the actual tranfer to the RAM disk.
*/
static int osurd_xfer_bio(struct osurd_dev *dev, struct bio *bio)
{
int i;
struct bio_vec *bvec;
sector_t sector = bio->bi_sector;
bio_for_each_segment(bvec, bio, i) {
char *buffer = __bio_kmap_atomic(bio, i, KM_USER0);
osurd_transfer(dev, sector, bio_cur_bytes(bio) >> 9,
buffer, bio_data_dir(bio) == WRITE);
sector += bio_cur_bytes(bio) >> 9;
__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_bytes(bio)>>9,
buffer, bio_data_dir(bio) == WRITE);
__bio_kunmap_atomic(bio, KM_USER0);
}
/*
* Transfer a single BIO.
*/
static int sbull_xfer_bio(struct sbull_dev *dev, struct bio *bio)
{
struct bio_vec bvec;
struct bvec_iter iter;
sector_t sector = bio->bi_iter.bi_sector;
/* Do each segment independently. */
bio_for_each_segment(bvec, bio, iter) {
char *buffer = __bio_kmap_atomic(bio, iter);
sbull_transfer(dev, sector,bytes_to_sectors_checked(bio_cur_bytes(bio)),
buffer, bio_data_dir(bio) == WRITE);
sector += (bytes_to_sectors_checked(bio_cur_bytes(bio)));
__bio_kunmap_atomic(bio);
}
static int simdisk_xfer_bio(struct simdisk *dev, struct bio *bio)
{
int i;
struct bio_vec *bvec;
sector_t sector = bio->bi_iter.bi_sector;
bio_for_each_segment(bvec, bio, i) {
char *buffer = __bio_kmap_atomic(bio, i, KM_USER0);
unsigned len = bvec->bv_len >> SECTOR_SHIFT;
simdisk_transfer(dev, sector, len, buffer,
bio_data_dir(bio) == WRITE);
sector += len;
__bio_kunmap_atomic(bio, KM_USER0);
}
static blk_qc_t simdisk_make_request(struct request_queue *q, struct bio *bio)
{
struct simdisk *dev = q->queuedata;
struct bio_vec bvec;
struct bvec_iter iter;
sector_t sector = bio->bi_iter.bi_sector;
bio_for_each_segment(bvec, bio, iter) {
char *buffer = __bio_kmap_atomic(bio, iter);
unsigned len = bvec.bv_len >> SECTOR_SHIFT;
simdisk_transfer(dev, sector, len, buffer,
bio_data_dir(bio) == WRITE);
sector += len;
__bio_kunmap_atomic(buffer);
}
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);
}