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-rw-r--r--fs/bio.c7
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,
};