1 files changed, 9 insertions, 7 deletions

diff --git a/fs/bio.c b/fs/bio.c
index 12429c9553eb..dc17afd672e3 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -507,10 +507,8 @@ int bio_get_nr_vecs(struct block_device *bdev)
 	int nr_pages;
 
 	nr_pages = ((queue_max_sectors(q) << 9) + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	if (nr_pages > queue_max_phys_segments(q))
-		nr_pages = queue_max_phys_segments(q);
-	if (nr_pages > queue_max_hw_segments(q))
-		nr_pages = queue_max_hw_segments(q);
+	if (nr_pages > queue_max_segments(q))
+		nr_pages = queue_max_segments(q);
 
 	return nr_pages;
 }
@@ -542,13 +540,18 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
 
 		if (page == prev->bv_page &&
 		    offset == prev->bv_offset + prev->bv_len) {
+			unsigned int prev_bv_len = prev->bv_len;
 			prev->bv_len += len;
 
 			if (q->merge_bvec_fn) {
 				struct bvec_merge_data bvm = {
+					/* prev_bvec is already charged in
+					   bi_size, discharge it in order to
+					   simulate merging updated prev_bvec
+					   as new bvec. */
 					.bi_bdev = bio->bi_bdev,
 					.bi_sector = bio->bi_sector,
-					.bi_size = bio->bi_size,
+					.bi_size = bio->bi_size - prev_bv_len,
 					.bi_rw = bio->bi_rw,
 				};
 
@@ -570,8 +573,7 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
 	 * make this too complex.
 	 */
 
-	while (bio->bi_phys_segments >= queue_max_phys_segments(q)
-	       || bio->bi_phys_segments >= queue_max_hw_segments(q)) {
+	while (bio->bi_phys_segments >= queue_max_segments(q)) {
 
 		if (retried_segments)
 			return 0;