Re: 2.5.70-bk16: nfs crash

[Dipankar Sarma]

On Thu, Jun 12, 2003 at 10:24:16PM -0700, Trond Myklebust wrote:
> Wrong. Look at the VFS code. In all cases the test is of the form.
> 
>     spin_lock(&dcache_lock);
>     /* Are we the sole users of this dentry */
>     if (atomic_read(&dentry->d_count) == 1) {
>        /* Yes - do some operation */
>     }
> 
> 
> Knowing that d_lookup() can *increase* d_count is not a plus here. The
> whole idea is to have a test for sole use.

I missed this part. If you want to do this, I would suggest taking
the per-dentry lock instead. Most dcache routines have been fixed
to do this. We will look around and see anything violates this rule.

Thanks
Dipankar