Re: Removing Mandatory Locks

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To: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: Removing Mandatory Locks
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Tue, 17 Aug 2021 18:50:21 +0200
Cc: Andy Lutomirski <luto@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, David Laight <David.Laight@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-MM <linux-mm@xxxxxxxxx>, Florian Weimer <fweimer@xxxxxxxxxx>, Michael Kerrisk <mtk.manpages@xxxxxxxxx>
In-reply-to: <87k0kkxbjn.fsf_-_@disp2133>
Organization: Red Hat
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 17.08.21 18:48, Eric W. Biederman 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.


kernel-ark also seems to not set it for Fedora and ARK

redhat/configs/common/generic/CONFIG_MANDATORY_FILE_LOCKING:#CONFIG_MANDATORY_FILE_LOCKING is not set



--
Thanks,

David / dhildenb

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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