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authorChristoph Hellwig <hch@lst.de>2015-01-18 16:16:32 +0100
committerJens Axboe <axboe@fb.com>2015-02-05 09:30:42 -0700
commit75c72b8366f35f2e5cf1b841b52095948878b794 (patch)
tree7b7637a0d6dde82baaa894f3244175fd93d8c68c /block
parent26e49cfc7e988a76bf1e55cef0d9e438e5489180 (diff)
downloadkernel-75c72b8366f35f2e5cf1b841b52095948878b794.tar.gz
block: merge __bio_map_kern into bio_map_kern
This saves a little code, and allow to simplify the error handling. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/bio.c50
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)