[Cluster-devel] [PATCH v1 05/11] locks: encapsulate the fl_link list handling

[Jeff Layton]

Move the fl_link list handling routines into a separate set of helpers.
Also move the global list handling out of locks_insert_block, and into
the caller that ends up triggering it as that allows us to eliminate the
IS_POSIX check there.

Signed-off-by: Jeff Layton <jlay...@redhat.com>
---
 fs/locks.c |   34 +++++++++++++++++++++++++++++-----
 1 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index cef0e04..caca466 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -494,13 +494,38 @@ static int posix_same_owner(struct file_lock *fl1, struct 
file_lock *fl2)
        return fl1->fl_owner == fl2->fl_owner;
 }
 
+/* Remove a blocker or lock from one of the global lists */
+static inline void
+locks_insert_global_blocked(struct file_lock *waiter)
+{
+       list_add(&waiter->fl_link, &blocked_list);
+}
+
+static inline void
+locks_delete_global_blocked(struct file_lock *waiter)
+{
+       list_del_init(&waiter->fl_link);
+}
+
+static inline void
+locks_insert_global_locks(struct file_lock *waiter)
+{
+       list_add_tail(&waiter->fl_link, &file_lock_list);
+}
+
+static inline void
+locks_delete_global_locks(struct file_lock *waiter)
+{
+       list_del_init(&waiter->fl_link);
+}
+
 /* Remove waiter from blocker's block list.
  * When blocker ends up pointing to itself then the list is empty.
  */
 static void __locks_delete_block(struct file_lock *waiter)
 {
        list_del_init(&waiter->fl_block);
-       list_del_init(&waiter->fl_link);
+       locks_delete_global_blocked(waiter);
        waiter->fl_next = NULL;
 }
 
@@ -524,8 +549,6 @@ static void locks_insert_block(struct file_lock *blocker,
        BUG_ON(!list_empty(&waiter->fl_block));
        list_add_tail(&waiter->fl_block, &blocker->fl_block);
        waiter->fl_next = blocker;
-       if (IS_POSIX(blocker))
-               list_add(&waiter->fl_link, &blocked_list);
 }
 
 /* Wake up processes blocked waiting for blocker.
@@ -552,7 +575,7 @@ static void locks_wake_up_blocks(struct file_lock *blocker)
  */
 static void locks_insert_lock(struct file_lock **pos, struct file_lock *fl)
 {
-       list_add(&fl->fl_link, &file_lock_list);
+       locks_insert_global_locks(fl);
 
        fl->fl_nspid = get_pid(task_tgid(current));
 
@@ -573,7 +596,7 @@ static void locks_delete_lock(struct file_lock **thisfl_p)
 
        *thisfl_p = fl->fl_next;
        fl->fl_next = NULL;
-       list_del_init(&fl->fl_link);
+       locks_delete_global_locks(fl);
 
        if (fl->fl_nspid) {
                put_pid(fl->fl_nspid);
@@ -839,6 +862,7 @@ static int __posix_lock_file(struct inode *inode, struct 
file_lock *request, str
                                goto out;
                        error = FILE_LOCK_DEFERRED;
                        locks_insert_block(fl, request);
+                       locks_insert_global_blocked(request);
                        goto out;
                }
        }
-- 
1.7.1