From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ACAFAC5CFE7 for ; Wed, 11 Jul 2018 02:24:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6EC7A20936 for ; Wed, 11 Jul 2018 02:24:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6EC7A20936 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ZenIV.linux.org.uk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732797AbeGKC0A (ORCPT ); Tue, 10 Jul 2018 22:26:00 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:45638 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732355AbeGKCYG (ORCPT ); Tue, 10 Jul 2018 22:24:06 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.87 #1 (Red Hat Linux)) id 1fd4lc-0003KB-VX; Wed, 11 Jul 2018 02:22:08 +0000 From: Al Viro To: Linus Torvalds Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Miklos Szeredi Subject: [RFC][PATCH 26/42] switch atomic_open() and lookup_open() to returning 0 in all success cases Date: Wed, 11 Jul 2018 03:21:50 +0100 Message-Id: <20180711022206.12571-26-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20180711022206.12571-1-viro@ZenIV.linux.org.uk> References: <20180711021136.GN30522@ZenIV.linux.org.uk> <20180711022206.12571-1-viro@ZenIV.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro caller can tell "opened" from "open it yourself" by looking at ->f_mode. Signed-off-by: Al Viro --- fs/namei.c | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 8b1e5cb85f58..ca3f4dec8cda 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3027,9 +3027,9 @@ static int may_o_create(const struct path *dir, struct dentry *dentry, umode_t m * Returns 0 if successful. The file will have been created and attached to * @file by the filesystem calling finish_open(). * - * Returns 1 if the file was looked up only or didn't need creating. The - * caller will need to perform the open themselves. @path will have been - * updated to point to the new dentry. This may be negative. + * If the file was looked up only or didn't need creating, FMODE_OPENED won't + * be set. The caller will need to perform the open themselves. @path will + * have been updated to point to the new dentry. This may be negative. * * Returns an error code otherwise. */ @@ -3082,7 +3082,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry, } else { path->dentry = dentry; path->mnt = nd->path.mnt; - return 1; + return 0; } } } @@ -3093,17 +3093,17 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry, /* * Look up and maybe create and open the last component. * - * Must be called with i_mutex held on parent. - * - * Returns 0 if the file was successfully atomically created (if necessary) and - * opened. In this case the file will be returned attached to @file. + * Must be called with parent locked (exclusive in O_CREAT case). * - * Returns 1 if the file was not completely opened at this time, though lookups - * and creations will have been performed and the dentry returned in @path will - * be positive upon return if O_CREAT was specified. If O_CREAT wasn't - * specified then a negative dentry may be returned. + * Returns 0 on success, that is, if + * the file was successfully atomically created (if necessary) and opened, or + * the file was not completely opened at this time, though lookups and + * creations were performed. + * These case are distinguished by presence of FMODE_OPENED on file->f_mode. + * In the latter case dentry returned in @path might be negative if O_CREAT + * hadn't been specified. * - * An error code is returned otherwise. + * An error code is returned on failure. */ static int lookup_open(struct nameidata *nd, struct path *path, struct file *file, @@ -3225,7 +3225,7 @@ static int lookup_open(struct nameidata *nd, struct path *path, out_no_open: path->dentry = dentry; path->mnt = nd->path.mnt; - return 1; + return 0; out_dput: dput(dentry); @@ -3308,10 +3308,10 @@ static int do_last(struct nameidata *nd, else inode_unlock_shared(dir->d_inode); - if (error <= 0) { - if (error) - goto out; + if (error) + goto out; + if (file->f_mode & FMODE_OPENED) { if ((file->f_mode & FMODE_CREATED) || !S_ISREG(file_inode(file)->i_mode)) will_truncate = false; -- 2.11.0