[PATCH v2 05/14] locks: encapsulate the fl_link list handling

From: Jeff Layton
Date: Tue Jun 11 2013 - 07:12:35 EST


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 <jlayton@xxxxxxxxxx>
Acked-by: J. Bruce Fields <bfields@xxxxxxxxxxxx>
---
fs/locks.c | 37 +++++++++++++++++++++++++++++++------
1 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index c186649..e451d18 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -484,13 +484,38 @@ 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)
{
+ locks_delete_global_blocked(waiter);
list_del_init(&waiter->fl_block);
- list_del_init(&waiter->fl_link);
waiter->fl_next = NULL;
}

@@ -514,8 +539,6 @@ 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);
}

/*
@@ -543,13 +566,13 @@ 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);
-
fl->fl_nspid = get_pid(task_tgid(current));

/* insert into file's list */
fl->fl_next = *pos;
*pos = fl;
+
+ locks_insert_global_locks(fl);
}

/*
@@ -562,9 +585,10 @@ static void locks_delete_lock(struct file_lock **thisfl_p)
{
struct file_lock *fl = *thisfl_p;

+ locks_delete_global_locks(fl);
+
*thisfl_p = fl->fl_next;
fl->fl_next = NULL;
- list_del_init(&fl->fl_link);

if (fl->fl_nspid) {
put_pid(fl->fl_nspid);
@@ -830,6 +854,7 @@ 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

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