Re: [PATCH 09/13] VFS/namei: enable RCU-walk when following symlinks.

[Al Viro]

On Mon, Mar 16, 2015 at 03:43:20PM +1100, NeilBrown wrote:
>  	if (should_follow_link(path->dentry, follow)) {
> -		if (nd->flags & LOOKUP_RCU) {
> -			if (unlikely(unlazy_walk(nd, path->dentry))) {
> -				err = -ECHILD;
> -				goto out_err;
> -			}
> -		}
>  		BUG_ON(inode != path->dentry->d_inode);

... and now this BUG_ON() can bloody well be triggered.
>  	if (should_follow_link(path->dentry, !symlink_ok)) {
> -		if (nd->flags & LOOKUP_RCU) {
> -			if (unlikely(unlazy_walk(nd, path->dentry))) {
> -				error = -ECHILD;
> -				goto out;
> -			}
> -		}
>  		BUG_ON(inode != path->dentry->d_inode);

So can this.
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