vfs: do_last(): inline walk_component()

Copy walk_component() into do_lookup().

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 edc18cd..f6b31c9 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2200,6 +2200,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
        int want_write = 0;
        int acc_mode = op->acc_mode;
        struct file *filp;
+       struct inode *inode;
        int error;
 
        nd->flags &= ~LOOKUP_PARENT;
@@ -2237,12 +2238,36 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
                if (open_flag & O_PATH && !(nd->flags & LOOKUP_FOLLOW))
                        symlink_ok = 1;
                /* we _can_ be in RCU mode here */
-               error = walk_component(nd, path, &nd->last, LAST_NORM,
-                                       !symlink_ok);
-               if (error < 0)
-                       return ERR_PTR(error);
-               if (error) /* symlink */
+               error = lookup_fast(nd, &nd->last, path, &inode);
+               if (unlikely(error)) {
+                       if (error < 0)
+                               goto exit;
+
+                       error = lookup_slow(nd, &nd->last, path);
+                       if (error < 0)
+                               goto exit;
+
+                       inode = path->dentry->d_inode;
+               }
+               error = -ENOENT;
+               if (!inode) {
+                       path_to_nameidata(path, nd);
+                       goto exit;
+               }
+
+               if (should_follow_link(inode, !symlink_ok)) {
+                       if (nd->flags & LOOKUP_RCU) {
+                               if (unlikely(unlazy_walk(nd, path->dentry))) {
+                                       error = -ECHILD;
+                                       goto exit;
+                               }
+                       }
+                       BUG_ON(inode != path->dentry->d_inode);
                        return NULL;
+               }
+               path_to_nameidata(path, nd);
+               nd->inode = inode;
+
                /* sayonara */
                error = complete_walk(nd);
                if (error)