From patchwork Mon May 21 16:01:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adam Manzanares X-Patchwork-Id: 10415839 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DE11A6032C for ; Mon, 21 May 2018 16:03:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CF87427C2D for ; Mon, 21 May 2018 16:03:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C371828738; Mon, 21 May 2018 16:03:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5538827C2D for ; Mon, 21 May 2018 16:03:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752897AbeEUQCb (ORCPT ); Mon, 21 May 2018 12:02:31 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:59151 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752092AbeEUQC2 (ORCPT ); Mon, 21 May 2018 12:02:28 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1526918549; x=1558454549; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=Dmaa0IlF6rEyE4+tQeNgBQp4t2iO+qPHONBbECf3eds=; b=YE0/grReyoeGu3jPINp2o4bdsFCdbC3tixkhs65nVl0QmEdqKhWATRt4 9aj5VhVy5SHsNUG7e/5C9wDjM1CSM1hjk7h1nsqKDSgshnuVe6ZXVyPXp ruCpnH6HDtGPEyfzvGjL6K2sZMv1KE0MB1JMT8cn38yaGU5HphIAoJqd2 rx3IZFyGkZmN857MJCQ9J0elfJYrnBthhnd6ZDvfKxnYKlUteHglOd5/r svoVaONJtA6hcjhsw9ahYUO1/rBz8Npz0gbgiK4T8Y7BVgkQIfN1/edUG e+kf8iIyLiich+37IRBcopQFGA+uZWMmfH/Xw9pFTnizhO/O1OlXXcsxX g==; X-IronPort-AV: E=Sophos;i="5.49,426,1520870400"; d="scan'208";a="79445383" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 22 May 2018 00:02:28 +0800 Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP; 21 May 2018 08:53:25 -0700 Received: from penguito-adamm.sdcorp.global.sandisk.com ([10.11.47.13]) by uls-op-cesaip02.wdc.com with ESMTP; 21 May 2018 09:02:28 -0700 From: adam.manzanares@wdc.com To: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org, axboe@kernel.dk, bcrl@kvack.org Cc: tglx@linutronix.de, mingo@kernel.org, pombredanne@nexb.com, kstewart@linuxfoundation.org, gregkh@linuxfoundation.org, bigeasy@linutronix.de, jack@suse.cz, darrick.wong@oracle.com, rgoldwyn@suse.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-aio@kvack.org, linux-api@vger.kernel.org, hch@infradread.org, Adam Manzanares Subject: [PATCH v5 1/5] block: add ioprio_check_cap function Date: Mon, 21 May 2018 09:01:43 -0700 Message-Id: <20180521160147.2372-2-adam.manzanares@wdc.com> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180521160147.2372-1-adam.manzanares@wdc.com> References: <20180521160147.2372-1-adam.manzanares@wdc.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Adam Manzanares Aio per command iopriority support introduces a second interface between userland and the kernel capable of passing iopriority. The aio interface also needs the ability to verify that the submitting context has sufficient priviledges to submit IOPRIO_RT commands. This patch creates the ioprio_check_cap function to be used by the ioprio_set system call and also by the aio interface. Signed-off-by: Adam Manzanares Reviewed-by: Christoph Hellwig Reviewed-by: Jeff Moyer --- block/ioprio.c | 22 ++++++++++++++++------ include/linux/ioprio.h | 2 ++ 2 files changed, 18 insertions(+), 6 deletions(-) diff --git a/block/ioprio.c b/block/ioprio.c index 6f5d0b6625e3..f9821080c92c 100644 --- a/block/ioprio.c +++ b/block/ioprio.c @@ -61,15 +61,10 @@ int set_task_ioprio(struct task_struct *task, int ioprio) } EXPORT_SYMBOL_GPL(set_task_ioprio); -SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio) +int ioprio_check_cap(int ioprio) { int class = IOPRIO_PRIO_CLASS(ioprio); int data = IOPRIO_PRIO_DATA(ioprio); - struct task_struct *p, *g; - struct user_struct *user; - struct pid *pgrp; - kuid_t uid; - int ret; switch (class) { case IOPRIO_CLASS_RT: @@ -92,6 +87,21 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio) return -EINVAL; } + return 0; +} + +SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio) +{ + struct task_struct *p, *g; + struct user_struct *user; + struct pid *pgrp; + kuid_t uid; + int ret; + + ret = ioprio_check_cap(ioprio); + if (ret) + return ret; + ret = -ESRCH; rcu_read_lock(); switch (which) { diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h index 627efac73e6d..4a28cec49ec3 100644 --- a/include/linux/ioprio.h +++ b/include/linux/ioprio.h @@ -77,4 +77,6 @@ extern int ioprio_best(unsigned short aprio, unsigned short bprio); extern int set_task_ioprio(struct task_struct *task, int ioprio); +extern int ioprio_check_cap(int ioprio); + #endif