From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755901AbcAXWOG (ORCPT ); Sun, 24 Jan 2016 17:14:06 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:60973 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755944AbcAXWE7 (ORCPT ); Sun, 24 Jan 2016 17:04:59 -0500 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Russell King , Steven Rostedt , Luis Henriques Subject: [PATCH 3.16.y-ckt 100/128] scripts: recordmcount: break hardlinks Date: Sun, 24 Jan 2016 22:00:55 +0000 Message-Id: <1453672883-2708-101-git-send-email-luis.henriques@canonical.com> In-Reply-To: <1453672883-2708-1-git-send-email-luis.henriques@canonical.com> References: <1453672883-2708-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.16 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.7-ckt23 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Russell King commit dd39a26538e37f6c6131e829a4a510787e43c783 upstream. recordmcount edits the file in-place, which can cause problems when using ccache in hardlink mode. Arrange for recordmcount to break a hardlinked object. Link: http://lkml.kernel.org/r/E1a7MVT-0000et-62@rmk-PC.arm.linux.org.uk Signed-off-by: Russell King Signed-off-by: Steven Rostedt Signed-off-by: Luis Henriques --- scripts/recordmcount.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 650ecc83d7d7..26f0cd2c8e9a 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -194,6 +194,20 @@ static void *mmap_file(char const *fname) addr = umalloc(sb.st_size); uread(fd_map, addr, sb.st_size); } + if (sb.st_nlink != 1) { + /* file is hard-linked, break the hard link */ + close(fd_map); + if (unlink(fname) < 0) { + perror(fname); + fail_file(); + } + fd_map = open(fname, O_RDWR | O_CREAT, sb.st_mode); + if (fd_map < 0) { + perror(fname); + fail_file(); + } + uwrite(fd_map, addr, sb.st_size); + } return addr; }