linux-kernel - [PATCH 0/6 resend] statfs: handle mount propagation

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Message-Id: <20180502154239.14013-1-christian.brauner@ubuntu.com>
Date:   Wed,  2 May 2018 17:42:33 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     viro@...iv.linux.org.uk, torvalds@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        hch@...radead.org
Cc:     tglx@...utronix.de, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, pombredanne@...b.com,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: [PATCH 0/6 resend] statfs: handle mount propagation

Hey,

This is the second resend of this patchset. I'm not sure whether it has
simply been overlooked but the number of people get_maintainer.pl was
rather small and seemed a little random so I added Linus and Christoph,
two people I know that do look at VFS stuff at least from time to time,
although they weren't listed by get_maintainer.pl. I hope that's ok.

This little series
- unifies the definition of constants in statfs.h and fs.h
  *Note, that Andreas has expressed doubts whether this unification is
  useful. Please see https://lkml.org/lkml/2018/4/13/571 . I still think
  it is but I'm happy to drop these two patches if others agree.*
- extends statfs to handle mount propagation. This will let userspace
  easily query a given mountpoint for MS_UNBINDABLE, MS_SHARED,
  MS_PRIVATE and MS_SLAVE without always having to do costly parsing of
  /proc/<pid>/mountinfo.
  To this end the flags:
  - ST_UNBINDABLE
  - ST_SHARED
  - ST_PRIVATE
  - ST_SLAVE
  are added. They have the same value as their MS_* counterparts.

Thanks!
Christian

Christian Brauner (6):
  fs: use << for MS_* flags
  statfs: use << to align with fs header
  statfs: add ST_UNBINDABLE
  statfs: add ST_SHARED
  statfs: add ST_SLAVE
  statfs: add ST_PRIVATE

 fs/statfs.c             | 16 +++++++++++++++-
 include/linux/statfs.h  | 30 +++++++++++++++++-------------
 include/uapi/linux/fs.h | 33 +++++++++++++++++----------------
 3 files changed, 49 insertions(+), 30 deletions(-)

-- 
2.17.0