statfs: handle mount propagation

From:		Christian Brauner <christian.brauner-AT-ubuntu.com>
To:		viro-AT-zeniv.linux.org.uk, kstewart-AT-linuxfoundation.org, tglx-AT-linutronix.de, pombredanne-AT-nexb.com, gregkh-AT-linuxfoundation.org, linux-fsdevel-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, akpm-AT-linux-foundation.org
Subject:		[PATCH 0/6 RESEND] statfs: handle mount propagation
Date:		Wed, 18 Apr 2018 11:27:16 +0200
Message-ID:		<20180418092722.20136-1-christian.brauner@ubuntu.com>
Cc:		Christian Brauner <christian.brauner-AT-ubuntu.com>

Hey,

This is a resend of this to CC more people and because it seems to have
gotten lost in the prior merge window. I should've sent it afterwards
right away.

This series:
- unifies the definition of constants in statfs.h and fs.h
  Please note the comments by Greg and others on this part:
  https://patchwork.kernel.org/patch/10340403/
  https://patchwork.kernel.org/patch/10340379/
  I haven't yet changed the fs.h and statfs.h header changes to not
  bitshifts. I wanted to wait what Al would think of it.
- 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.

The patchset was made against Al's vfs/for-next tree.

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_PRIVATE
  statfs: add ST_SLAVE

 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