From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753179AbdKIBlc (ORCPT ); Wed, 8 Nov 2017 20:41:32 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:47571 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752750AbdKIBlb (ORCPT ); Wed, 8 Nov 2017 20:41:31 -0500 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Hugh Dickins , Andrea Arcangeli , Michal Hocko , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , David Herrmann , Andrew Morton , Mike Kravetz Subject: [RFC PATCH 0/3] restructure memfd code Date: Wed, 8 Nov 2017 17:41:06 -0800 Message-Id: <20171109014109.21077-1-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.13.6 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With the addition of memfd hugetlbfs support, we now have the situation where memfd depends on TMPFS -or- HUGETLBFS. Previously, memfd was only supported on tmpfs, so it made sense that the code resides in shmem.c. This patch series moves the memfd code to separate files (memfd.c and memfd.h). It creates a new config option MEMFD_CREATE that is defined if either TMPFS or HUGETLBFS is defined. In the current code, memfd is only functional if TMPFS is defined. If HUGETLFS is defined and TMPFS is not defined, then memfd functionality will not be available for hugetlbfs. This does not cause BUGs, just a potential lack of desired functionality. Another way to approach this issue would be to simply make HUGETLBFS depend on TMPFS. This patch series is built on top of the Marc-André Lureau v3 series "memfd: add sealing to hugetlb-backed memory": http://lkml.kernel.org/r/20171107122800.25517-1-marcandre.lureau@redhat.com Mike Kravetz (3): mm: hugetlbfs: move HUGETLBFS_I outside #ifdef CONFIG_HUGETLBFS mm: memfd: split out memfd for use by multiple filesystems mm: memfd: remove memfd code from shmem files and use new memfd files fs/Kconfig | 3 + fs/fcntl.c | 2 +- include/linux/hugetlb.h | 27 ++-- include/linux/memfd.h | 16 +++ include/linux/shmem_fs.h | 13 -- mm/Makefile | 1 + mm/memfd.c | 341 +++++++++++++++++++++++++++++++++++++++++++++++ mm/shmem.c | 323 -------------------------------------------- 8 files changed, 378 insertions(+), 348 deletions(-) create mode 100644 include/linux/memfd.h create mode 100644 mm/memfd.c -- 2.13.6