From acc9cb3cd425f479d8fc4a441bff45dce23aa6dd Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 30 Mar 2012 14:13:15 -0400 Subject: [PATCH] untangling do_lookup() - eliminate a loop. d_lookup() *will* fail after successful d_invalidate(), if we are holding i_mutex all along. IOW, we don't need to jump back to l: - we know what path will be taken there and can do that (i.e. d_alloc_and_lookup()) directly. Signed-off-by: Al Viro --- fs/namei.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 48fc0fb..9ce43a3 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1173,7 +1173,6 @@ retry: BUG_ON(nd->inode != dir); mutex_lock(&dir->i_mutex); -l: dentry = d_lookup(parent, name); if (likely(!dentry)) { dentry = d_alloc_and_lookup(parent, name, nd); @@ -1204,9 +1203,14 @@ l: } if (!d_invalidate(dentry)) { dput(dentry); - dentry = NULL; - need_reval = 1; - goto l; + dentry = d_alloc_and_lookup(parent, name, nd); + if (IS_ERR(dentry)) { + mutex_unlock(&dir->i_mutex); + return PTR_ERR(dentry); + } + /* known good */ + need_reval = 0; + status = 1; } } mutex_unlock(&dir->i_mutex); -- 2.7.4