linux-kernel - [PATCH 02/14] mnt: port to ns_ref

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Message-Id: <20250918-work-namespace-ns_ref-v1-2-1b0a98ee041e@kernel.org>
Date: Thu, 18 Sep 2025 12:11:47 +0200
From: Christian Brauner <brauner@...nel.org>
To: linux-fsdevel@...r.kernel.org
Cc: Amir Goldstein <amir73il@...il.com>, Josef Bacik <josef@...icpanda.com>, 
 Jeff Layton <jlayton@...nel.org>, Mike Yuan <me@...dnzj.com>, 
 Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>, 
 Lennart Poettering <mzxreary@...inter.de>, 
 Daan De Meyer <daan.j.demeyer@...il.com>, Aleksa Sarai <cyphar@...har.com>, 
 Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
 Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>, 
 Michal Koutný <mkoutny@...e.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Anna-Maria Behnsen <anna-maria@...utronix.de>, 
 Frederic Weisbecker <frederic@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, cgroups@...r.kernel.org, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 Christian Brauner <brauner@...nel.org>
Subject: [PATCH 02/14] mnt: port to ns_ref_*() helpers

Stop accessing ns.count directly.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 fs/mount.h     | 2 +-
 fs/namespace.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/mount.h b/fs/mount.h
index 76bf863c9ae2..79c85639a7ba 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -143,7 +143,7 @@ static inline void detach_mounts(struct dentry *dentry)
 
 static inline void get_mnt_ns(struct mnt_namespace *ns)
 {
-	refcount_inc(&ns->ns.count);
+	ns_ref_inc(ns);
 }
 
 extern seqlock_t mount_lock;
diff --git a/fs/namespace.c b/fs/namespace.c
index 03bd04559e69..8cc04e0e64da 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2111,7 +2111,7 @@ struct mnt_namespace *get_sequential_mnt_ns(struct mnt_namespace *mntns, bool pr
 		 * the mount namespace and it might already be on its
 		 * deathbed.
 		 */
-		if (!refcount_inc_not_zero(&mntns->ns.count))
+		if (!ns_ref_get(mntns))
 			continue;
 
 		return mntns;
@@ -6080,7 +6080,7 @@ void __init mnt_init(void)
 
 void put_mnt_ns(struct mnt_namespace *ns)
 {
-	if (!refcount_dec_and_test(&ns->ns.count))
+	if (!ns_ref_put(ns))
 		return;
 	namespace_lock();
 	emptied_ns = ns;

-- 
2.47.3