Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755072AbbEKSIa (ORCPT ); Mon, 11 May 2015 14:08:30 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:46999 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754929AbbEKSIQ (ORCPT ); Mon, 11 May 2015 14:08:16 -0400 From: Al Viro To: Linus Torvalds Cc: Neil Brown , Christoph Hellwig , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v3 025/110] do_last: regularize the logics around following symlinks Date: Mon, 11 May 2015 19:06:45 +0100 Message-Id: <1431367690-5223-25-git-send-email-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <20150511180650.GA4147@ZenIV.linux.org.uk> References: <20150511180650.GA4147@ZenIV.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1558 Lines: 55 From: Al Viro With LOOKUP_FOLLOW we unlazy and return 1; without it we either fail with ELOOP or, for O_PATH opens, succeed. No need to mix those cases... Signed-off-by: Al Viro --- fs/namei.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 3e45233..54cbfe7 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3046,9 +3046,7 @@ retry_lookup: goto out; } finish_lookup: - /* we _can_ be in RCU mode here */ - if (should_follow_link(path->dentry, - !(open_flag & O_PATH) || (nd->flags & LOOKUP_FOLLOW))) { + if (should_follow_link(path->dentry, nd->flags & LOOKUP_FOLLOW)) { if (nd->flags & LOOKUP_RCU) { if (unlikely(nd->path.mnt != path->mnt || unlazy_walk(nd, path->dentry))) { @@ -3057,14 +3055,15 @@ finish_lookup: } } BUG_ON(inode != path->dentry->d_inode); - if (!(nd->flags & LOOKUP_FOLLOW)) { - path_put_conditional(path, nd); - path_put(&nd->path); - return -ELOOP; - } return 1; } + if (unlikely(d_is_symlink(path->dentry)) && !(open_flag & O_PATH)) { + path_to_nameidata(path, nd); + error = -ELOOP; + goto out; + } + if ((nd->flags & LOOKUP_RCU) || nd->path.mnt != path->mnt) { path_to_nameidata(path, nd); } else { -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/