linux-kernel - [PATCH v2 1/2] fs: warn about impending deprecation of mandatory locks

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Date:   Fri, 20 Aug 2021 09:57:06 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     ebiederm@...ssion.com, david@...hat.com, willy@...radead.org,
        linux-nfs@...r.kernel.org, viro@...iv.linux.org.uk,
        linux-doc@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-afs@...ts.infradead.org, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-mm@...ck.org,
        akpm@...ux-foundation.org, luto@...nel.org, bfields@...ldses.org,
        w@....eu, rostedt@...dmis.org, stable@...r.kernel.org
Subject: [PATCH v2 1/2] fs: warn about impending deprecation of mandatory locks

We've had CONFIG_MANDATORY_FILE_LOCKING since 2015 and a lot of distros
have disabled it. Warn the stragglers that still use "-o mand" that
we'll be dropping support for that mount option.

Cc: stable@...r.kernel.org
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/namespace.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index ab4174a3c802..ffab0bb1e649 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1716,8 +1716,16 @@ static inline bool may_mount(void)
 }
 
 #ifdef	CONFIG_MANDATORY_FILE_LOCKING
+static bool warned_mand;
 static inline bool may_mandlock(void)
 {
+	if (!warned_mand) {
+		warned_mand = true;
+		pr_warn("======================================================\n");
+		pr_warn("WARNING: the mand mount option is being deprecated and\n");
+		pr_warn("         will be removed in v5.15!\n");
+		pr_warn("======================================================\n");
+	}
 	return capable(CAP_SYS_ADMIN);
 }
 #else
-- 
2.31.1