orangefs: don't mess with I_DIRTY_TIMES in orangefs_flush

Christoph Hellwig noticed that we were doing some unnecessary
work in orangefs_flush:

  orangefs_flush just writes out data on every close(2) call.  There is
  no need to change anything about the dirty state, especially as
  orangefs doesn't treat I_DIRTY_TIMES special in any way.  The code
  seems to come from partially open coding vfs_fsync.

He sent in a patch with the above commit message and also a
patch that was a reversion of another Orangefs patch I had
sent upstream a while ago. I had to fix his reversion patch
so that it would compile which caused his "don't mess with
I_DIRTY_TIMES" patch to fail to apply. So here I have just
remade his patch and applied it after the fixed reversion patch.
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/file.c

@@ -645,16 +645,8 @@ static int orangefs_flush(struct file *file, fl_owner_t id)
 	 * on an explicit fsync call.  This duplicates historical OrangeFS
 	 * behavior.
 	 */
-	struct inode *inode = file->f_mapping->host;
 	int r;
 
-	if (inode->i_state & I_DIRTY_TIME) {
-		spin_lock(&inode->i_lock);
-		inode->i_state &= ~I_DIRTY_TIME;
-		spin_unlock(&inode->i_lock);
-		mark_inode_dirty_sync(inode);
-	}
-
 	r = filemap_write_and_wait_range(file->f_mapping, 0, LLONG_MAX);
 	if (r > 0)
 		return 0;