/* * Functions related to mapping data to requests */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/uio.h> #include "blk.h" /* * Append a bio to a passthrough request. Only works can be merged into * the request based on the driver constraints. */ int blk_rq_append_bio(struct request *rq, struct bio *bio) { if (!rq->bio) { blk_rq_bio_prep(rq->q, rq, bio); } else { if (!ll_back_merge_fn(rq->q, rq, bio)) return -EINVAL; rq->biotail->bi_next = bio; rq->biotail = bio; rq->__data_len += bio->bi_iter.bi_size; } return 0; } EXPORT_SYMBOL(blk_rq_append_bio); static int __blk_rq_unmap_user(struct bio *bio) { int ret = 0; if (bio) { if (bio_flagged(bio, BIO_USER_MAPPED)) bio_unmap_user(bio); else ret = bio_uncopy_user(bio); } return ret; } static int __blk_rq_map_user_iov(struct request *rq, struct rq_map_data *map_data, struct iov_iter *iter, gfp_t gfp_mask, bool copy) { struct request_queue *q = rq->q; struct bio *bio, *orig_bio; int ret; if (copy) bio = bio_copy_user_iov(q, map_data, iter, gfp_mask); else bio = bio_map_user_iov(q, iter, gfp_mask); if (IS_ERR(bio)) return PTR_ERR(bio); if (map_data && map_data->null_mapped) bio_set_flag(bio, BIO_NULL_MAPPED); iov_iter_advance(iter, bio->bi_iter.bi_size); if (map_data) map_data->offset += bio->bi_iter.bi_size; orig_bio = bio; blk_queue_bounce(q, &bio); /* * We link the bounce buffer in and could have to traverse it * later so we have to get a ref to prevent it from being freed */ bio_get(bio); ret = blk_rq_append_bio(rq, bio); if (ret) { bio_endio(bio); __blk_rq_unmap_user(orig_bio); bio_put(bio); return ret; } return 0; } /** * blk_rq_map_user_iov - map user data to a request, for REQ_TYPE_BLOCK_PC usage * @q: request queue where request should be inserted * @rq: request to map data to * @map_data: pointer to the rq_map_data holding pages (if necessary) * @iter: iovec iterator * @gfp_mask: memory allocation flags * * Description: * Data will be mapped directly for zero copy I/O, if possible. Otherwise * a kernel bounce buffer is used. * * A matching blk_rq_unmap_user() must be issued at the end of I/O, while * still in process context. * * Note: The mapped bio may need to be bounced through blk_queue_bounce() * before being submitted to the device, as pages mapped may be out of * reach. It's the callers responsibility to make sure this happens. The * original bio must be passed back in to blk_rq_unmap_user() for proper * unmapping. */ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, struct rq_map_data *map_data, const struct iov_iter *iter, gfp_t gfp_mask) { bool copy = false; unsigned long align = q->dma_pad_mask | queue_dma_alignment(q); struct bio *bio = NULL; struct iov_iter i; int ret; if (map_data) copy = true; else if (iov_iter_alignment(iter) & align) copy = true; else if (queue_virt_boundary(q)) copy = queue_virt_boundary(q) & iov_iter_gap_alignment(iter); i = *iter; do { ret =__blk_rq_map_user_iov(rq, map_data, &i, gfp_mask, copy); if (ret) goto unmap_rq; if (!bio) bio = rq->bio; } while (iov_iter_count(&i)); if (!bio_flagged(bio, BIO_USER_MAPPED)) rq->cmd_flags |= REQ_COPY_USER; return 0; unmap_rq: __blk_rq_unmap_user(bio); rq->bio = NULL; return -EINVAL; } EXPORT_SYMBOL(blk_rq_map_user_iov); int blk_rq_map_user(struct request_queue *q, struct request *rq, struct rq_map_data *map_data, void __user *ubuf, unsigned long len, gfp_t gfp_mask) { struct iovec iov; struct iov_iter i; int ret = import_single_range(rq_data_dir(rq), ubuf, len, &iov, &i); if (unlikely(ret < 0)) return ret; return blk_rq_map_user_iov(q, rq, map_data, &i, gfp_mask); } EXPORT_SYMBOL(blk_rq_map_user); /** * blk_rq_unmap_user - unmap a request with user data * @bio: start of bio list * * Description: * Unmap a rq previously mapped by blk_rq_map_user(). The caller must * supply the original rq->bio from the blk_rq_map_user() return, since * the I/O completion may have changed rq->bio. */ int blk_rq_unmap_user(struct bio *bio) { struct bio *mapped_bio; int ret = 0, ret2; while (bio) { mapped_bio = bio; if (unlikely(bio_flagged(bio, BIO_BOUNCED))) mapped_bio = bio->bi_private; ret2 = __blk_rq_unmap_user(mapped_bio); if (ret2 && !ret) ret = ret2; mapped_bio = bio; bio = bio->bi_next; bio_put(mapped_bio); } return ret; } EXPORT_SYMBOL(blk_rq_unmap_user); /** * blk_rq_map_kern - map kernel data to a request, for REQ_TYPE_BLOCK_PC usage * @q: request queue where request should be inserted * @rq: request to fill * @kbuf: the kernel buffer * @len: length of user data * @gfp_mask: memory allocation flags * * Description: * Data will be mapped directly if possible. Otherwise a bounce * buffer is used. Can be called multiple times to append multiple * buffers. */ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf, unsigned int len, gfp_t gfp_mask) { int reading = rq_data_dir(rq) == READ; unsigned long addr = (unsigned long) kbuf; int do_copy = 0; struct bio *bio; int ret; if (len > (queue_max_hw_sectors(q) << 9)) return -EINVAL; if (!len || !kbuf) return -EINVAL; do_copy = !blk_rq_aligned(q, addr, len) || object_is_on_stack(kbuf); if (do_copy) bio = bio_copy_kern(q, kbuf, len, gfp_mask, reading); else bio = bio_map_kern(q, kbuf, len, gfp_mask); if (IS_ERR(bio)) return PTR_ERR(bio); if (!reading) bio_set_op_attrs(bio, REQ_OP_WRITE, 0); if (do_copy) rq->cmd_flags |= REQ_COPY_USER; ret = blk_rq_append_bio(rq, bio); if (unlikely(ret)) { /* request is too big */ bio_put(bio); return ret; } blk_queue_bounce(q, &rq->bio); return 0; } EXPORT_SYMBOL(blk_rq_map_kern);