vfs: do_last(): common slow lookup

Make the slow lookup part of O_CREAT and non-O_CREAT opens common.

This allows atomic_open to be hooked into the slow lookup part.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index 12ed29712b4e03cfad6cc53cc1bdc09413f34a21..285e62e925f74c226f004c94bd77f2683caa3f2e 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2250,30 +2250,13 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
                        symlink_ok = 1;
                /* we _can_ be in RCU mode here */
                error = lookup_fast(nd, &nd->last, path, &inode);
-               if (unlikely(error)) {
-                       if (error < 0)
-                               goto exit;
-
-                       BUG_ON(nd->inode != dir->d_inode);
-
-                       mutex_lock(&dir->d_inode->i_mutex);
-                       dentry = __lookup_hash(&nd->last, dir, nd);
-                       mutex_unlock(&dir->d_inode->i_mutex);
-                       error = PTR_ERR(dentry);
-                       if (IS_ERR(dentry))
-                               goto exit;
-                       path->mnt = nd->path.mnt;
-                       path->dentry = dentry;
-                       error = follow_managed(path, nd->flags);
-                       if (unlikely(error < 0))
-                               goto exit_dput;
+               if (likely(!error))
+                       goto finish_lookup;
 
-                       if (error)
-                               nd->flags |= LOOKUP_JUMPED;
+               if (error < 0)
+                       goto exit;
 
-                       inode = path->dentry->d_inode;
-               }
-               goto finish_lookup;
+               BUG_ON(nd->inode != dir->d_inode);
        } else {
                /* create side of things */
                /*