Re: Removing Mandatory Locks

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To: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject: Re: Removing Mandatory Locks
From: Rodrigo Campos <rodrigo@xxxxxxxxxx>
Date: Wed, 18 Aug 2021 11:34:26 +0200
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, David Laight <David.Laight@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Namhyung Kim <namhyung@xxxxxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Greg Ungerer <gerg@xxxxxxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Vincenzo Frascino <vincenzo.frascino@xxxxxxx>, Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>, Michel Lespinasse <walken@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Huang Ying <ying.huang@xxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Feng Tang <feng.tang@xxxxxxxxx>, Kevin Brodsky <Kevin.Brodsky@xxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Shawn Anastasio <shawn@xxxxxxxxxx>, Steven Price <steven.price@xxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Christian Brauner <christian.brauner@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Shakeel Butt <shakeelb@xxxxxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>, Nicolas Viennot <Nicolas.Viennot@xxxxxxxxxxxx>, Thomas Cedeno <thomascedeno@xxxxxxxxxx>, Collin Fijalkovich <cfijalkovich@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Miklos Szeredi <miklos@xxxxxxxxxx>, Chengguang Xu <cgxu519@xxxxxxxxxxxx>, Christian König <ckoenig.leichtzumerken@xxxxxxxxx>, "linux-unionfs@xxxxxxxxxxxxxxx" <linux-unionfs@xxxxxxxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, "the arch/x86 maintainers" <x86@xxxxxxxxxx>, "<linux-fsdevel@xxxxxxxxxxxxxxx>" <linux-fsdevel@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, Florian Weimer <fweimer@xxxxxxxxxx>, Michael Kerrisk <mtk.manpages@xxxxxxxxx>
In-reply-to: <87k0kkxbjn.fsf_-_@disp2133>

On Tue, Aug 17, 2021 at 6:49 PM Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
>
> Matthew Wilcox <willy@xxxxxxxxxxxxx> writes:
>
> > On Fri, Aug 13, 2021 at 05:49:19PM -0700, Andy Lutomirski wrote:
> >> [0] we have mandatory locks, too. Sigh.
> >
> > I'd love to remove that.  Perhaps we could try persuading more of the
> > distros to disable the CONFIG option first.
>
> Yes.  The support is disabled in RHEL8.

If it helps, it seems to be enabled on the just released debian stable:
    $ grep CONFIG_MANDATORY_FILE_LOCKING /boot/config-5.10.0-8-amd64
    CONFIG_MANDATORY_FILE_LOCKING=y

Also the new 5.13 kernel in experimental has it too:
    $ grep CONFIG_MANDATORY_FILE_LOCKING /boot/config-5.13.0-trunk-amd64
    CONFIG_MANDATORY_FILE_LOCKING=y

Follow-Ups:
- Re: Removing Mandatory Locks
  - From: Jeff Layton

References:
- [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: David Hildenbrand
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Eric W. Biederman
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Andy Lutomirski
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Eric W. Biederman
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Linus Torvalds
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Eric W. Biederman
- RE: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: David Laight
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Linus Torvalds
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Andy Lutomirski
- Re: [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: Matthew Wilcox
- Removing Mandatory Locks
  - From: Eric W. Biederman

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