1 files changed, 1 insertions, 5 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5b1514e58de4..e875c7c8a647 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -313,13 +313,9 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
         u64 logical = bio->bi_sector << 9;
         u64 length = 0;
         u64 map_length;
-        struct bio_vec *bvec;
-        int i;
         int ret;
 
-        bio_for_each_segment(bvec, bio, i) {
-                length += bvec->bv_len;
-        }
+        length = bio->bi_size;
         map_tree = &root->fs_info->mapping_tree;
         map_length = length;
         ret = btrfs_map_block(map_tree, READ, logical,