linux-kernel - Re: [PATCH 1/2] ceph: conversion to new fscache API

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Date:   Wed, 01 Dec 2021 06:31:00 -0500
From:   Jeff Layton <jlayton@...nel.org>
To:     David Howells <dhowells@...hat.com>
Cc:     ceph-devel@...r.kernel.org, idryomov@...il.com,
        linux-fsdevel@...r.kernel.org, linux-cachefs@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ceph: conversion to new fscache API

On Mon, 2021-11-29 at 16:46 +0000, David Howells wrote:
> Jeff Layton <jlayton@...nel.org> wrote:
> 
> > +void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
> >  {
> > -	return fscache_register_netfs(&ceph_cache_netfs);
> > +	struct fscache_cookie* cookie = xchg(&ci->fscache, NULL);
> > +
> > +	fscache_relinquish_cookie(cookie, false);
> >  }
> 
> xchg() should be excessive there.  This is only called from
> ceph_evict_inode().  Also, if you're going to reset the pointer, it might be
> worth poisoning it rather than nulling it.
> 

Ok, makes sense. I'll make that change soon.
-- 
Jeff Layton <jlayton@...nel.org>