From: Mark Fasheh Date: Thu, 24 Jan 2008 00:54:48 +0000 (-0800) Subject: ocfs2: document access rules for blocked_lock_list X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=7ec373cf33533af6c50828a62f6b305c2d7fa931;p=deliverable%2Flinux.git ocfs2: document access rules for blocked_lock_list ocfs2_super->blocked_lock_list and ocfs2_super->blocked_lock_count have some usage restrictions which aren't immediately obvious to anyone reading the code. It's a good idea to document this so that we avoid making costly mistakes in the future. Signed-off-by: Mark Fasheh --- diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index 22e334d125d0..d08480580470 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -262,6 +262,12 @@ struct ocfs2_super unsigned long dc_wake_sequence; unsigned long dc_work_sequence; + /* + * Any thread can add locks to the list, but the downconvert + * thread is the only one allowed to remove locks. Any change + * to this rule requires updating + * ocfs2_downconvert_thread_do_work(). + */ struct list_head blocked_lock_list; unsigned long blocked_lock_count;