Re: [PATCH 2/5 v3] locks: Copy all infomation for conflock

Commit d5b9026a67 ([PATCH] knfsd: locks: flag NFSv4-owned locks) using
fl_lmops field in file_lock for checking nfsd4 lockowner.

But, commit 1a747ee0cc (locks: don't call ->copy_lock methods on return
of conflicting locks) causes the fl_lmops of conflock always be NULL.

Also, commit 0996905f93 (lockd: posix_test_lock() should not call
locks_copy_lock()) caused the fl_lmops of conflock always be NULL too.

Make sure copy the private information by fl_copy_lock() in struct
file_lock_operations, merge __locks_copy_lock() to fl_copy_lock().

v3: Update based on Joe and Jeff's patch.

Signed-off-by: Kinglong Mee <redacted>
---
 fs/locks.c         | 24 +++++++-----------------
 include/linux/fs.h |  6 ------
 2 files changed, 7 insertions(+), 23 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index cb66fb0..fe52abb 100644
--- a/fs/locks.c
+++ b/fs/locks.c

@@ -281,33 +281,23 @@ static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
 /*
  * Initialize a new lock from an existing file_lock structure.
  */
-void __locks_copy_lock(struct file_lock *new, const struct file_lock *fl)
+void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
 {
+	/* "new" must be a freshly-initialized lock */
+	WARN_ON_ONCE(new->fl_ops);
+
 	new->fl_owner = fl->fl_owner;
 	new->fl_pid = fl->fl_pid;
-	new->fl_file = NULL;
+	new->fl_file = fl->fl_file;
 	new->fl_flags = fl->fl_flags;
 	new->fl_type = fl->fl_type;
 	new->fl_start = fl->fl_start;
 	new->fl_end = fl->fl_end;
 	new->fl_ops = NULL;
 	new->fl_lmops = NULL;
-}
-EXPORT_SYMBOL(__locks_copy_lock);
-
-void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
-{
-	/* "new" must be a freshly-initialized lock */
-	WARN_ON_ONCE(new->fl_ops);
-
-	__locks_copy_lock(new, fl);
-	new->fl_file = fl->fl_file;
-	new->fl_ops = fl->fl_ops;
-	new->fl_lmops = fl->fl_lmops;
 
 	locks_copy_private(new, fl);
 }
-
 EXPORT_SYMBOL(locks_copy_lock);
 
 static inline int flock_translate_cmd(int cmd) {

@@ -735,7 +725,7 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
 			break;
 	}
 	if (cfl) {
-		__locks_copy_lock(fl, cfl);
+		locks_copy_lock(fl, cfl);
 		if (cfl->fl_nspid)
 			fl->fl_pid = pid_vnr(cfl->fl_nspid);
 	} else

@@ -941,7 +931,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
 			if (!posix_locks_conflict(request, fl))
 				continue;
 			if (conflock)
-				__locks_copy_lock(conflock, fl);
+				locks_copy_lock(conflock, fl);
 			error = -EAGAIN;
 			if (!(request->fl_flags & FL_SLEEP))
 				goto out;

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 908af4f..a383a30 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h

@@ -966,7 +966,6 @@ void locks_free_lock(struct file_lock *fl);
 extern void locks_init_lock(struct file_lock *);
 extern struct file_lock * locks_alloc_lock(void);
 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
-extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
 extern void locks_remove_posix(struct file *, fl_owner_t);
 extern void locks_remove_file(struct file *);
 extern void locks_release_private(struct file_lock *);

@@ -1026,11 +1025,6 @@ static inline void locks_init_lock(struct file_lock *fl)
 	return;
 }
 
-static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
-{
-	return;
-}
-
 static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
 {
 	return;