--- Revision None
+++ Revision 346266326530
@@ -0,0 +1,34 @@
+diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
+index 4129de5..f2071e82 100644
+--- a/fs/btrfs/file.c
++++ b/fs/btrfs/file.c
+@@ -1960,6 +1960,7 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
+                return ret;
+ 
+        inode_lock(inode);
++       inode_dio_wait(inode);
+        atomic_inc(&root->log_batch);
+        full_sync = test_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
+                             &BTRFS_I(inode)->runtime_flags);
+diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
+index 7f3a080..c1c04b7 100644
+--- a/fs/btrfs/tree-log.c
++++ b/fs/btrfs/tree-log.c
+@@ -4149,7 +4149,7 @@ static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans,
+ 
+        INIT_LIST_HEAD(&extents);
+ 
+-       down_write(&BTRFS_I(inode)->dio_sem);
++       /* down_write(&BTRFS_I(inode)->dio_sem); */
+        write_lock(&tree->lock);
+        test_gen = root->fs_info->last_trans_committed;
+ 
+@@ -4218,7 +4218,7 @@ process:
+        }
+        WARN_ON(!list_empty(&extents));
+        write_unlock(&tree->lock);
+-       up_write(&BTRFS_I(inode)->dio_sem);
++       /* up_write(&BTRFS_I(inode)->dio_sem); */
+ 
+        btrfs_release_path(path);
+        return ret;