From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932707AbcGOKlB (ORCPT ); Fri, 15 Jul 2016 06:41:01 -0400 Received: from mail-wm0-f67.google.com ([74.125.82.67]:36630 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932187AbcGOKhX (ORCPT ); Fri, 15 Jul 2016 06:37:23 -0400 From: Topi Miettinen To: linux-kernel@vger.kernel.org Cc: Topi Miettinen , Alexander Viro , linux-fsdevel@vger.kernel.org (open list:FILESYSTEMS (VFS and infrastructure)) Subject: [PATCH 06/14] resource limits: track highwater mark of cores dumped Date: Fri, 15 Jul 2016 13:35:53 +0300 Message-Id: <1468578983-28229-7-git-send-email-toiwoton@gmail.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1468578983-28229-1-git-send-email-toiwoton@gmail.com> References: <1468578983-28229-1-git-send-email-toiwoton@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Track maximum size of core dump written, to be able to configure RLIMIT_CORE resource limits. The information is available with taskstats and cgroupstats netlink socket. Signed-off-by: Topi Miettinen --- fs/coredump.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/coredump.c b/fs/coredump.c index 281b768..a0ace88 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -784,20 +784,25 @@ int dump_emit(struct coredump_params *cprm, const void *addr, int nr) struct file *file = cprm->file; loff_t pos = file->f_pos; ssize_t n; + int r = 0; + if (cprm->written + nr > cprm->limit) return 0; while (nr) { if (dump_interrupted()) - return 0; + goto err; n = __kernel_write(file, addr, nr, &pos); if (n <= 0) - return 0; + goto err; file->f_pos = pos; cprm->written += n; cprm->pos += n; nr -= n; } - return 1; + r = 1; + err: + update_resource_highwatermark(RLIMIT_CORE, cprm->written); + return r; } EXPORT_SYMBOL(dump_emit); -- 2.8.1