linux-kernel - Re: [PATCH v9 03/21] cachefiles: unbind cachefiles gracefully in on-demand mode

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Date:   Thu, 21 Apr 2022 15:02:18 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        willy@...radead.org, linux-fsdevel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        tao.peng@...ux.alibaba.com, gerry@...ux.alibaba.com,
        eguan@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        luodaowen.backend@...edance.com, tianzichen@...ishou.com,
        fannaihao@...du.com, zhangjiachen.jaycee@...edance.com
Subject: Re: [PATCH v9 03/21] cachefiles: unbind cachefiles gracefully in on-demand mode

Jeffle Xu <jefflexu@...ux.alibaba.com> wrote:

> +	struct kref			unbind_pincount;/* refcount to do daemon unbind */

Please use refcount_t or atomic_t, especially as this isn't the refcount for
the structure.

> -	cachefiles_daemon_unbind(cache);
> -
>  	/* clean up the control file interface */
>  	cache->cachefilesd = NULL;
>  	file->private_data = NULL;
>  	cachefiles_open = 0;

Please call cachefiles_daemon_unbind() before the cleanup.

David