1. page add to bio
int f2fs_submit_page_bio(struct f2fs_io_info *fio) /* Allocate a new bio */ bio = __bio_alloc(fio, 1); if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { bio_put(bio); return -EFAULT; } __submit_bio(fio->sbi, bio, fio->type);
2. blo map to scatterlist(sg)
blk_rq_map_sg
blk_rq_map_sg+0x0/0x544 mmc_blk_data_prep+0x220/0x2c8 mmc_blk_rw_rq_prep+0x50/0x16c mmc_blk_mq_issue_rq+0x238/0xd88 mmc_mq_queue_rq+0x1fc/0x26c blk_mq_dispatch_rq_list+0x154/0x4ec blk_mq_do_dispatch_sched+0x64/0x1e8 blk_mq_sched_dispatch_requests+0x12c/0x1b0 __blk_mq_run_hw_queue+0xe4/0x11c blk_mq_run_work_fn+0x18/0x20
3. dma_map_sg，get dma_address