Re: [PATCH 5.13 126/127] fs: warn about impending deprecation of mandatory locks

[Naresh Kamboju]

On Tue, 24 Aug 2021 at 22:35, Sasha Levin <sashal@xxxxxxxxxx> wrote:
>
> From: Jeff Layton <jlayton@xxxxxxxxxx>
>
> [ 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@xxxxxxxxxxxxxxx
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
> ---
>  fs/namespace.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/fs/namespace.c b/fs/namespace.c
> index caad091fb204..03770bae9dd5 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -1716,8 +1716,12 @@ 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");

We are getting this error on all devices while running LTP syscalls
ftruncate test cases
on all the stable-rc branches.

- Naresh