linux-kernel - [PATCH] filelock: add new locks_wake_up

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Message-Id: <20250602-filelock-6-16-v1-1-7da5b2c930fd@kernel.org>
Date: Mon, 02 Jun 2025 07:58:54 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Chuck Lever <chuck.lever@...cle.com>, 
 Alexander Aring <alex.aring@...il.com>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH] filelock: add new locks_wake_up_waiter() helper

Currently the function that does this takes a struct file_lock, but
__locks_wake_up_blocks() deals with both locks and leases. Currently
this works because both file_lock and file_lease have the file_lock_core
at the beginning of the struct, but it's fragile to rely on that.

Add a new locks_wake_up_waiter() function and call that from
__locks_wake_up_blocks().

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
Christian, would you mind picking this up?
---
 fs/locks.c               | 2 +-
 include/linux/filelock.h | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 1619cddfa7a4d799f0f84f0bc8f28458d8d280db..f96024feab176537b79be41e505e60ef92fb7d68 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -712,7 +712,7 @@ static void __locks_wake_up_blocks(struct file_lock_core *blocker)
 		    fl->fl_lmops && fl->fl_lmops->lm_notify)
 			fl->fl_lmops->lm_notify(fl);
 		else
-			locks_wake_up(fl);
+			locks_wake_up_waiter(waiter);
 
 		/*
 		 * The setting of flc_blocker to NULL marks the "done"
diff --git a/include/linux/filelock.h b/include/linux/filelock.h
index c412ded9171ed781ebe9e8d2e0426dcd10793292..c2ce8ba05d068b451ecf8f513b7e532819a29944 100644
--- a/include/linux/filelock.h
+++ b/include/linux/filelock.h
@@ -175,9 +175,14 @@ static inline bool lock_is_write(struct file_lock *fl)
 	return fl->c.flc_type == F_WRLCK;
 }
 
+static inline void locks_wake_up_waiter(struct file_lock_core *flc)
+{
+	wake_up(&flc->flc_wait);
+}
+
 static inline void locks_wake_up(struct file_lock *fl)
 {
-	wake_up(&fl->c.flc_wait);
+	locks_wake_up_waiter(&fl->c);
 }
 
 static inline bool locks_can_async_lock(const struct file_operations *fops)

---
base-commit: cd2e103d57e5615f9bb027d772f93b9efd567224
change-id: 20250602-filelock-6-16-b78bea7fc9ca

Best regards,
-- 
Jeff Layton <jlayton@...nel.org>