From e8bb73dfb0aad673a3b9650e9af0ba1739a4df01 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 8 May 2015 16:28:42 -0400 Subject: [PATCH] namei: fold put_link() into the failure case of complete_walk() ... 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 c6ff9da69cec..55283fe95245 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(); + if (unlikely(unlazy_walk(nd, NULL))) { + terminate_walk(nd); 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); - 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 @@ static int do_last(struct nameidata *nd, finish_open: error = complete_walk(nd); if (error) { - if (nd->depth) - put_link(nd); path_put(&save_parent); return error; }