1 files changed, 6 insertions, 1 deletions

diff --git a/fs/bio.c b/fs/bio.c
index 12429c9553eb..88094afc29ea 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -542,13 +542,18 @@ 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,
                                 };