diff options
| -rw-r--r-- | block/bio.c | 50 |
1 files changed, 17 insertions, 33 deletions
diff --git a/block/bio.c b/block/bio.c index 7d8c6555e3f3..a69a9c9e7c93 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1429,8 +1429,18 @@ static void bio_map_kern_endio(struct bio *bio, int err) bio_put(bio); } -static struct bio *__bio_map_kern(struct request_queue *q, void *data, - unsigned int len, gfp_t gfp_mask) +/** + * bio_map_kern - map kernel address into bio + * @q: the struct request_queue for the bio + * @data: pointer to buffer to map + * @len: length in bytes + * @gfp_mask: allocation flags for bio allocation + * + * Map the kernel address into a bio suitable for io to a block + * device. Returns an error pointer in case of error. + */ +struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, + gfp_t gfp_mask) { unsigned long kaddr = (unsigned long)data; unsigned long end = (kaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT; @@ -1454,8 +1464,11 @@ static struct bio *__bio_map_kern(struct request_queue *q, void *data, bytes = len; if (bio_add_pc_page(q, bio, virt_to_page(data), bytes, - offset) < bytes) - break; + offset) < bytes) { + /* we don't support partial mappings */ + bio_put(bio); + return ERR_PTR(-EINVAL); + } data += bytes; len -= bytes; @@ -1465,35 +1478,6 @@ static struct bio *__bio_map_kern(struct request_queue *q, void *data, bio->bi_end_io = bio_map_kern_endio; return bio; } - -/** - * bio_map_kern - map kernel address into bio - * @q: the struct request_queue for the bio - * @data: pointer to buffer to map - * @len: length in bytes - * @gfp_mask: allocation flags for bio allocation - * - * Map the kernel address into a bio suitable for io to a block - * device. Returns an error pointer in case of error. - */ -struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, - gfp_t gfp_mask) -{ - struct bio *bio; - - bio = __bio_map_kern(q, data, len, gfp_mask); - if (IS_ERR(bio)) - return bio; - - if (bio->bi_iter.bi_size == len) - return bio; - - /* - * Don't support partial mappings. - */ - bio_put(bio); - return ERR_PTR(-EINVAL); -} EXPORT_SYMBOL(bio_map_kern); static void bio_copy_kern_endio(struct bio *bio, int err) |