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int mpage_readpages(struct address_space *mapping, struct list_head *pages, unsigned nr_pages, get_block_t get_block){ for (page_idx = 0; page_idx < nr_pages; page_idx++){ struct page *page = list_entry(pages->prev, struct page, lru); bio = do_mpage_readpage(bio, page, nr_pages - page_idx, &last_block_in_bio, &map_bh, &first_logical_block, get_block); =>static struct bio * do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages, sector_t *last_block_in_bio, struct buffer_head *map_bh, unsigned long *first_logical_block, get_block_t get_block) { if (bio && (*last_block_in_bio != blocks[0] - 1)) bio = mpage_bio_submit(READ, bio); alloc_new: if (bio == NULL) { bio = mpage_alloc(bdev, blocks[0] << (blkbits - 9), min_t(int, nr_pages, bio_get_nr_vecs(bdev)), GFP_KERNEL); } if (bio_add_page(bio, page, length, 0) < length) { bio = mpage_bio_submit(READ, bio); goto alloc_new; } } } if (bio) mpage_bio_submit(READ, bio); return 0; } bio与bio_vec
https://blog.csdn.net/zhufengtianya/article/details/42145985宋宝华： 文件读写（BIO）波澜壮阔的一生
https://blog.csdn.net/juS3Ve/article/details/79890688