1 files changed, 7 insertions, 0 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index b0352b5958a5..1a47251a9d4d 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -762,6 +762,13 @@ static int prepare_pages(struct btrfs_root *root, struct file *file,
                 set_page_extent_mapped(pages[i]);
                 WARN_ON(!PageLocked(pages[i]));
         }
+        if (start_pos < inode->i_size) {
+                u64 last_pos;
+                last_pos = (index + num_pages) << PAGE_CACHE_SHIFT;
+                clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
+                                  last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC,
+                                  GFP_NOFS);
+        }
         return 0;
 }