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ocfs2: document access rules for blocked_lock_list

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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>
This commit is contained in:
Mark Fasheh 2008-01-23 16:54:48 -08:00
parent 116ba5d5ea
commit 7ec373cf33
1 changed files with 6 additions and 0 deletions
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6
fs/ocfs2/ocfs2.h
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@ -262,6 +262,12 @@ struct ocfs2_super
unsigned long dc_wake_sequence; unsigned long dc_wake_sequence;
unsigned long dc_work_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; struct list_head blocked_lock_list;
unsigned long blocked_lock_count; unsigned long blocked_lock_count;