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[2003:d8:2f0a:7f00:fad7:3bc9:69d:31f]) by smtp.gmail.com with ESMTPSA id a18sm10107804wmg.43.2021.08.20.08.52.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 20 Aug 2021 08:52:20 -0700 (PDT) Subject: Re: [PATCH v2 1/2] fs: warn about impending deprecation of mandatory locks To: Jeff Layton , torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: ebiederm@xmission.com, willy@infradead.org, linux-nfs@vger.kernel.org, viro@zeniv.linux.org.uk, linux-doc@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-afs@lists.infradead.org, cluster-devel@redhat.com, ocfs2-devel@oss.oracle.com, linux-mm@kvack.org, akpm@linux-foundation.org, luto@kernel.org, bfields@fieldses.org, w@1wt.eu, rostedt@goodmis.org, stable@vger.kernel.org References: <20210820135707.171001-1-jlayton@kernel.org> <20210820135707.171001-2-jlayton@kernel.org> From: David Hildenbrand Organization: Red Hat Message-ID: <0f4f3e65-1d2d-e512-2a6f-d7d63effc479@redhat.com> Date: Fri, 20 Aug 2021 17:52:19 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210820135707.171001-2-jlayton@kernel.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 20.08.21 15:57, Jeff Layton wrote: > 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@vger.kernel.org > Signed-off-by: Jeff Layton > --- > 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"); > + } Is there a reason not to use pr_warn_once() ? -- Thanks, David / dhildenb