From patchwork Mon Oct 5 22:33:37 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ross Zwisler X-Patchwork-Id: 7331971 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 6D07FBEEA4 for ; Mon, 5 Oct 2015 22:34:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A526920603 for ; Mon, 5 Oct 2015 22:34:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C42F4205E5 for ; Mon, 5 Oct 2015 22:34:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752312AbbJEWeD (ORCPT ); Mon, 5 Oct 2015 18:34:03 -0400 Received: from mga02.intel.com ([134.134.136.20]:53704 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752100AbbJEWdr (ORCPT ); Mon, 5 Oct 2015 18:33:47 -0400 Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga101.jf.intel.com with ESMTP; 05 Oct 2015 15:33:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,641,1437462000"; d="scan'208";a="658457926" Received: from theros.lm.intel.com ([10.232.112.146]) by orsmga003.jf.intel.com with ESMTP; 05 Oct 2015 15:33:47 -0700 From: Ross Zwisler To: linux-kernel@vger.kernel.org Cc: Ross Zwisler , Alexander Viro , linux-fsdevel@vger.kernel.org, Dan Williams , linux-nvdimm@lists.01.org, Matthew Wilcox Subject: [PATCH 2/2] coredump: add DAX filtering for FDPIC ELF coredumps Date: Mon, 5 Oct 2015 16:33:37 -0600 Message-Id: <1444084417-19192-3-git-send-email-ross.zwisler@linux.intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1444084417-19192-1-git-send-email-ross.zwisler@linux.intel.com> References: <1444084417-19192-1-git-send-email-ross.zwisler@linux.intel.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add explicit filtering for DAX mappings to FDPIC ELF coredump. This is useful because DAX mappings have the potential to be very large. This patch has only been compile tested. Signed-off-by: Ross Zwisler --- fs/binfmt_elf_fdpic.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index d3634bf..8632501 100644 --- a/fs/binfmt_elf_fdpic.c +++ b/fs/binfmt_elf_fdpic.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include @@ -1206,6 +1207,20 @@ static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) return 0; } + /* support for DAX */ + if (vma_is_dax(vma)) { + if (vma->vm_flags & VM_SHARED) { + dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags); + kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start, + vma->vm_flags, dump_ok ? "yes" : "no"); + } else { + dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags); + kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start, + vma->vm_flags, dump_ok ? "yes" : "no"); + } + return dump_ok; + } + /* By default, dump shared memory if mapped from an anonymous file. */ if (vma->vm_flags & VM_SHARED) { if (file_inode(vma->vm_file)->i_nlink == 0) {