Re: dcache: remove trylock loops (was Re: [BUG] lock_parent() breakage when used from shrink_dentry_list())

[Al Viro]

On Mon, Mar 12, 2018 at 06:52:31PM -0500, Eric W. Biederman wrote:

> Ah.  I see now there is now the s_roots list that handles
> that bit of strangeness.
> 
> So one path is to simply remove the heuristic from
> path_connected.
> 
> Another path is to have nfsv2 and nfsv3 not set s_root at all.
> Leaving the heuristic working for the rest of the filesystems,
> and generally simplifying the code.
> 
> Something like the diff below I should think.

> +	/* Leave nfsv2 and nfsv3 s_root == NULL */

Now, grep fs/super.c for s_root.  Or try to boot it, for that
matter...