Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755327AbbEKSVJ (ORCPT ); Mon, 11 May 2015 14:21:09 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:47414 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755017AbbEKSI0 (ORCPT ); Mon, 11 May 2015 14:08:26 -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 080/110] namei: fold put_link() into the failure case of complete_walk() Date: Mon, 11 May 2015 19:07:40 +0100 Message-Id: <1431367690-5223-80-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: 2384 Lines: 92 From: Al Viro ... and don't open-code unlazy_walk() in there - the only reason for that is to avoid verfication of cached nd->root, which is trivially avoided by discarding said cached nd->root first. Signed-off-by: Al Viro --- fs/namei.c | 29 ++++++----------------------- 1 file changed, 6 insertions(+), 23 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index c6ff9da..55283fe 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -567,6 +567,8 @@ static inline int nd_alloc_stack(struct nameidata *nd) * to restart the path walk from the beginning in ref-walk mode. */ +static void terminate_walk(struct nameidata *nd); + /** * unlazy_walk - try to switch to ref-walk mode. * @nd: nameidata pathwalk data @@ -673,26 +675,12 @@ static int complete_walk(struct nameidata *nd) int status; if (nd->flags & LOOKUP_RCU) { - nd->flags &= ~LOOKUP_RCU; if (!(nd->flags & LOOKUP_ROOT)) nd->root.mnt = NULL; - - if (!legitimize_mnt(nd->path.mnt, nd->m_seq)) { - rcu_read_unlock(); - return -ECHILD; - } - if (unlikely(!lockref_get_not_dead(&dentry->d_lockref))) { - rcu_read_unlock(); - mntput(nd->path.mnt); - return -ECHILD; - } - if (read_seqcount_retry(&dentry->d_seq, nd->seq)) { - rcu_read_unlock(); - dput(dentry); - mntput(nd->path.mnt); + if (unlikely(unlazy_walk(nd, NULL))) { + terminate_walk(nd); return -ECHILD; } - rcu_read_unlock(); } if (likely(!(nd->flags & LOOKUP_JUMPED))) @@ -708,7 +696,7 @@ static int complete_walk(struct nameidata *nd) if (!status) status = -ESTALE; - path_put(&nd->path); + terminate_walk(nd); return status; } @@ -3008,11 +2996,8 @@ static int do_last(struct nameidata *nd, * about to look up */ error = complete_walk(nd); - if (error) { - if (nd->depth) - put_link(nd); + if (error) return error; - } audit_inode(name, dir, LOOKUP_PARENT); error = -EISDIR; @@ -3117,8 +3102,6 @@ finish_lookup: finish_open: error = complete_walk(nd); if (error) { - if (nd->depth) - put_link(nd); path_put(&save_parent); return error; } -- 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/