Fix btrfs_wait_ordered_extent_range to properly wait

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index d9c69e16d368..45127e4797c8 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -161,7 +161,8 @@ int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
 
         while(bio_index < bio->bi_vcnt) {
                 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
-                if (offset >= ordered->file_offset + ordered->len) {
+                if (offset >= ordered->file_offset + ordered->len ||
+                    offset < ordered->file_offset) {
                         unsigned long bytes_left;
                         sums->len = this_sum_bytes;
                         this_sum_bytes = 0;