linux-kernel - [PATCH 4.9 42/43] fs: warn about impending deprecation of mandatory locks

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Message-Id: <20210824170614.710813-43-sashal@kernel.org>
Date:   Tue, 24 Aug 2021 13:06:13 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jeff Layton <jlayton@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 42/43] fs: warn about impending deprecation of mandatory locks

From: Jeff Layton <jlayton@...nel.org>

[ Upstream commit fdd92b64d15bc4aec973caa25899afd782402e68 ]

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>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/namespace.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 68457fa2f981..b9e30a385c01 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1670,8 +1670,12 @@ static inline bool may_mount(void)
 }
 
 #ifdef	CONFIG_MANDATORY_FILE_LOCKING
-static inline bool may_mandlock(void)
+static bool may_mandlock(void)
 {
+	pr_warn_once("======================================================\n"
+		     "WARNING: the mand mount option is being deprecated and\n"
+		     "         will be removed in v5.15!\n"
+		     "======================================================\n");
 	return capable(CAP_SYS_ADMIN);
 }
 #else
-- 
2.30.2