From patchwork Tue May 5 05:22:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Al Viro X-Patchwork-Id: 6334641 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 38B09BEEE1 for ; Tue, 5 May 2015 05:32:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4547720268 for ; Tue, 5 May 2015 05:32:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6072F20266 for ; Tue, 5 May 2015 05:32:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965390AbbEEFcR (ORCPT ); Tue, 5 May 2015 01:32:17 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:40077 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755637AbbEEFXI (ORCPT ); Tue, 5 May 2015 01:23:08 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.76 #1 (Red Hat Linux)) id 1YpVJx-0001Oq-Q8; Tue, 05 May 2015 05:23:05 +0000 From: Al Viro To: Linus Torvalds Cc: Neil Brown , Christoph Hellwig , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 75/79] namei: simplify the callers of follow_managed() Date: Tue, 5 May 2015 06:22:49 +0100 Message-Id: <1430803373-4948-75-git-send-email-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <20150505052205.GS889@ZenIV.linux.org.uk> References: <20150505052205.GS889@ZenIV.linux.org.uk> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Al Viro now that it gets nameidata, no reason to have setting LOOKUP_JUMPED on mountpoint crossing and calling path_put_conditional() on failures done in every caller. Signed-off-by: Al Viro --- fs/namei.c | 32 ++++++++++---------------------- 1 file changed, 10 insertions(+), 22 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 5ac1079..c9c313c 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1118,7 +1118,11 @@ static int follow_managed(struct path *path, struct nameidata *nd) mntput(path->mnt); if (ret == -EISDIR) ret = 0; - return ret < 0 ? ret : need_mntput; + if (need_mntput) + nd->flags |= LOOKUP_JUMPED; + if (unlikely(ret < 0)) + path_put_conditional(path, nd); + return ret; } int follow_down_one(struct path *path) @@ -1486,14 +1490,9 @@ unlazy: path->mnt = mnt; path->dentry = dentry; err = follow_managed(path, nd); - if (unlikely(err < 0)) { - path_put_conditional(path, nd); - return err; - } - if (err) - nd->flags |= LOOKUP_JUMPED; - *inode = path->dentry->d_inode; - return 0; + if (likely(!err)) + *inode = path->dentry->d_inode; + return err; need_lookup: return 1; @@ -1503,7 +1502,6 @@ need_lookup: static int lookup_slow(struct nameidata *nd, struct path *path) { struct dentry *dentry, *parent; - int err; parent = nd->path.dentry; BUG_ON(nd->inode != parent->d_inode); @@ -1515,14 +1513,7 @@ static int lookup_slow(struct nameidata *nd, struct path *path) return PTR_ERR(dentry); path->mnt = nd->path.mnt; path->dentry = dentry; - err = follow_managed(path, nd); - if (unlikely(err < 0)) { - path_put_conditional(path, nd); - return err; - } - if (err) - nd->flags |= LOOKUP_JUMPED; - return 0; + return follow_managed(path, nd); } static inline int may_lookup(struct nameidata *nd) @@ -3090,10 +3081,7 @@ retry_lookup: error = follow_managed(&path, nd); if (error < 0) - goto exit_dput; - - if (error) - nd->flags |= LOOKUP_JUMPED; + goto out; BUG_ON(nd->flags & LOOKUP_RCU); inode = path.dentry->d_inode;