linux-kernel - [RFC PATCH 0/4] file: export functions for binder module

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Date:   Mon, 30 Jul 2018 16:37:06 +0200
From:   Christian Brauner <christian@...uner.io>
To:     viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     arve@...roid.com, tkjos@...roid.com, maco@...roid.com,
        rlove@...gle.com, ben@...adent.org.uk,
        Christian Brauner <christian@...uner.io>
Subject: [RFC PATCH 0/4] file: export functions for binder module

Hey,

We currently plan on turning the Android binder and ashmem driver into a
module. We have seen more and more requests by users to be able to use
the binder and ashmem features without wanting to convince each distro
to enable it by default in their kernel. Debian already started to carry
patches for turning them into modules.
The main problem is that binder currently uses multiple functions that
are not exported and are pretty low-level. The most obvious ones that
fall into this category are __alloc_fd(), __fd_install(),
get_files_struct(), and put_files_struct(). Being an IPC mechanism
binder seems like a reasonable user of these functions.
I don't expect this patch to be mergeable but rather to kick-off a
discussion if we can either simply export them as they are or how we can
get supportable exports that allow access to struct files_struct.

Thanks!
Christian

Christian Brauner (4):
  file: export __alloc_fd()
  file: export __fd_install()
  file: export get_files_struct()
  file: export put_files_struct()

 fs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.17.1