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authorMark Fasheh <mark.fasheh@oracle.com>2008-01-23 16:54:48 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2008-01-25 15:05:48 -0800
commit7ec373cf33533af6c50828a62f6b305c2d7fa931 (patch)
treee6f9f829f9d66658e57b5700935dca38f798cbf8
parent116ba5d5ea1a5789a8c14b1087014007cada363b (diff)
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 <mark.fasheh@oracle.com>
-rw-r--r--fs/ocfs2/ocfs2.h6
1 files changed, 6 insertions, 0 deletions
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;