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

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Date:   Mon, 29 Nov 2021 16:46:36 +0000
From:   David Howells <dhowells@...hat.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     dhowells@...hat.com, 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

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.

David