From patchwork Tue Feb 21 15:39:15 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Coddington X-Patchwork-Id: 9584877 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 CD5A5600CA for ; Tue, 21 Feb 2017 15:39:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B791F288A0 for ; Tue, 21 Feb 2017 15:39:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id ACA7F288DD; Tue, 21 Feb 2017 15:39:25 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 55DA1288A0 for ; Tue, 21 Feb 2017 15:39:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751812AbdBUPjX (ORCPT ); Tue, 21 Feb 2017 10:39:23 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54520 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751926AbdBUPjU (ORCPT ); Tue, 21 Feb 2017 10:39:20 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E30ED15447; Tue, 21 Feb 2017 15:39:20 +0000 (UTC) Received: from bcodding.csb (vpn-62-167.rdu2.redhat.com [10.10.62.167]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v1LFdJWE016721; Tue, 21 Feb 2017 10:39:19 -0500 Received: by bcodding.csb (Postfix, from userid 24008) id 9331210C2C21; Tue, 21 Feb 2017 10:39:17 -0500 (EST) From: Benjamin Coddington To: Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org Subject: [PATCH 2/4] NFS: Move the flock open mode check into nfs_flock() Date: Tue, 21 Feb 2017 10:39:15 -0500 Message-Id: <963d9833fd2a4a4a9e936fb951b45bdf007ef9c8.1487691345.git.bcodding@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Tue, 21 Feb 2017 15:39:21 +0000 (UTC) Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We only need to check lock exclusive/shared types against open mode when flock() is used on NFS, so move it into the flock-specific path instead of checking it for all locks. Signed-off-by: Benjamin Coddington Reviewed-by: Christoph Hellwig Reviewed-by: Jeff Layton --- fs/nfs/file.c | 18 ++++++++++++++++-- fs/nfs/nfs4proc.c | 14 -------------- 2 files changed, 16 insertions(+), 16 deletions(-) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 26dbe8b0c10d..a490f45df4db 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -820,9 +820,23 @@ int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK) is_local = 1; - /* We're simulating flock() locks using posix locks on the server */ - if (fl->fl_type == F_UNLCK) + /* + * VFS doesn't require the open mode to match a flock() lock's type. + * NFS, however, may simulate flock() locking with posix locking which + * requires the open mode to match the lock type. + */ + switch (fl->fl_type) { + case F_UNLCK: return do_unlk(filp, cmd, fl, is_local); + case F_RDLCK: + if (!(filp->f_mode & FMODE_READ)) + return -EBADF; + break; + case F_WRLCK: + if (!(filp->f_mode & FMODE_WRITE)) + return -EBADF; + } + return do_setlk(filp, cmd, fl, is_local); } EXPORT_SYMBOL_GPL(nfs_flock); diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 9388899e4050..91f88bfbbe79 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -6592,20 +6592,6 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) return -ENOLCK; - /* - * Don't rely on the VFS having checked the file open mode, - * since it won't do this for flock() locks. - */ - switch (request->fl_type) { - case F_RDLCK: - if (!(filp->f_mode & FMODE_READ)) - return -EBADF; - break; - case F_WRLCK: - if (!(filp->f_mode & FMODE_WRITE)) - return -EBADF; - } - status = nfs4_set_lock_state(state, request); if (status != 0) return status;