[PATCH 2/3 v2] fs/locks.c: New ops in file_lock_operations for copying/releasing owner

[Kinglong Mee <kinglongmee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

NFSD or other lockmanager may increase the owner's reference,
so adds two new options for copying and releasing owner.

v2: A new patch isn't exist in v1.

Signed-off-by: Kinglong Mee <kinglongmee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 fs/locks.c         | 12 ++++++++++--
 include/linux/fs.h |  2 ++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 91b0f03..f302a51 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -230,8 +230,12 @@ void locks_release_private(struct file_lock *fl)
 			fl->fl_ops->fl_release_private(fl);
 		fl->fl_ops = NULL;
 	}
-	fl->fl_lmops = NULL;
 
+	if (fl->fl_lmops) {
+		if (fl->fl_lmops->lm_release_owner)
+			fl->fl_lmops->lm_release_owner(fl);
+		fl->fl_lmops = NULL;
+	}
 }
 EXPORT_SYMBOL_GPL(locks_release_private);
 
@@ -262,8 +266,12 @@ static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
 			fl->fl_ops->fl_copy_lock(new, fl);
 		new->fl_ops = fl->fl_ops;
 	}
-	if (fl->fl_lmops)
+
+	if (fl->fl_lmops) {
+		if (fl->fl_lmops->lm_copy_owner)
+			fl->fl_lmops->lm_copy_owner(new, fl);
 		new->fl_lmops = fl->fl_lmops;
+	}
 }
 
 void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index ced023d..622efca 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -843,6 +843,8 @@ struct file_lock_operations {
 struct lock_manager_operations {
 	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
 	unsigned long (*lm_owner_key)(struct file_lock *);
+	void (*lm_copy_owner)(struct file_lock *, struct file_lock *);
+	void (*lm_release_owner)(struct file_lock *);
 	void (*lm_notify)(struct file_lock *);	/* unblock callback */
 	int (*lm_grant)(struct file_lock *, struct file_lock *, int);
 	void (*lm_break)(struct file_lock *);
-- 
1.9.3

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