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@@ -39,130 +39,6 @@ static int __blk_rq_unmap_user(struct bio *bio)
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return ret;
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}
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-static int __blk_rq_map_user(struct request_queue *q, struct request *rq,
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- struct rq_map_data *map_data, void __user *ubuf,
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- unsigned int len, gfp_t gfp_mask)
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-{
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- unsigned long uaddr;
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- struct bio *bio, *orig_bio;
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- int reading, ret;
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-
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- reading = rq_data_dir(rq) == READ;
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-
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- /*
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- * if alignment requirement is satisfied, map in user pages for
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- * direct dma. else, set up kernel bounce buffers
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- */
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- uaddr = (unsigned long) ubuf;
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- if (blk_rq_aligned(q, uaddr, len) && !map_data)
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- bio = bio_map_user(q, NULL, uaddr, len, reading, gfp_mask);
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- else
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- bio = bio_copy_user(q, map_data, uaddr, len, reading, gfp_mask);
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-
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- if (IS_ERR(bio))
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- return PTR_ERR(bio);
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-
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- if (map_data && map_data->null_mapped)
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- bio->bi_flags |= (1 << BIO_NULL_MAPPED);
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-
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- orig_bio = bio;
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- blk_queue_bounce(q, &bio);
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-
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- /*
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- * We link the bounce buffer in and could have to traverse it
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- * later so we have to get a ref to prevent it from being freed
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- */
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- bio_get(bio);
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-
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- ret = blk_rq_append_bio(q, rq, bio);
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- if (!ret)
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- return bio->bi_iter.bi_size;
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-
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- /* if it was boucned we must call the end io function */
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- bio_endio(bio, 0);
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- __blk_rq_unmap_user(orig_bio);
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- bio_put(bio);
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- return ret;
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-}
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-
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-/**
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- * blk_rq_map_user - map user data to a request, for REQ_TYPE_BLOCK_PC usage
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- * @q: request queue where request should be inserted
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- * @rq: request structure to fill
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- * @map_data: pointer to the rq_map_data holding pages (if necessary)
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- * @ubuf: the user buffer
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- * @len: length of user data
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- * @gfp_mask: memory allocation flags
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- *
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- * Description:
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- * Data will be mapped directly for zero copy I/O, if possible. Otherwise
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- * a kernel bounce buffer is used.
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- *
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- * A matching blk_rq_unmap_user() must be issued at the end of I/O, while
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- * still in process context.
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- *
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- * Note: The mapped bio may need to be bounced through blk_queue_bounce()
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- * before being submitted to the device, as pages mapped may be out of
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- * reach. It's the callers responsibility to make sure this happens. The
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- * original bio must be passed back in to blk_rq_unmap_user() for proper
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- * unmapping.
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- */
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-int blk_rq_map_user(struct request_queue *q, struct request *rq,
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- struct rq_map_data *map_data, void __user *ubuf,
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- unsigned long len, gfp_t gfp_mask)
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-{
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- unsigned long bytes_read = 0;
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- struct bio *bio = NULL;
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- int ret;
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-
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- if (len > (queue_max_hw_sectors(q) << 9))
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- return -EINVAL;
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- if (!len)
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- return -EINVAL;
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-
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- if (!ubuf && (!map_data || !map_data->null_mapped))
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- return -EINVAL;
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-
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- while (bytes_read != len) {
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- unsigned long map_len, end, start;
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-
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- map_len = min_t(unsigned long, len - bytes_read, BIO_MAX_SIZE);
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- end = ((unsigned long)ubuf + map_len + PAGE_SIZE - 1)
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- >> PAGE_SHIFT;
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- start = (unsigned long)ubuf >> PAGE_SHIFT;
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-
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- /*
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- * A bad offset could cause us to require BIO_MAX_PAGES + 1
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- * pages. If this happens we just lower the requested
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- * mapping len by a page so that we can fit
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- */
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- if (end - start > BIO_MAX_PAGES)
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- map_len -= PAGE_SIZE;
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-
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- ret = __blk_rq_map_user(q, rq, map_data, ubuf, map_len,
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- gfp_mask);
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- if (ret < 0)
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- goto unmap_rq;
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- if (!bio)
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- bio = rq->bio;
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- bytes_read += ret;
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- ubuf += ret;
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-
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- if (map_data)
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- map_data->offset += ret;
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- }
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-
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- if (!bio_flagged(bio, BIO_USER_MAPPED))
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- rq->cmd_flags |= REQ_COPY_USER;
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-
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- return 0;
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-unmap_rq:
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- blk_rq_unmap_user(bio);
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- rq->bio = NULL;
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- return ret;
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-}
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-EXPORT_SYMBOL(blk_rq_map_user);
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-
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/**
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* blk_rq_map_user_iov - map user data to a request, for REQ_TYPE_BLOCK_PC usage
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* @q: request queue where request should be inserted
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@@ -241,6 +117,19 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
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}
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EXPORT_SYMBOL(blk_rq_map_user_iov);
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+int blk_rq_map_user(struct request_queue *q, struct request *rq,
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+ struct rq_map_data *map_data, void __user *ubuf,
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+ unsigned long len, gfp_t gfp_mask)
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+{
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+ struct sg_iovec iov;
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+
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+ iov.iov_base = (void __user *)ubuf;
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+ iov.iov_len = len;
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+
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+ return blk_rq_map_user_iov(q, rq, map_data, &iov, 1, len, gfp_mask);
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+}
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+EXPORT_SYMBOL(blk_rq_map_user);
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+
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/**
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* blk_rq_unmap_user - unmap a request with user data
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* @bio: start of bio list
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Christoph Hellwig