linux-kernel - Re: [PATCH V4 3/5] cachefiles: resend an open request if the read request's object is closed

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Message-ID: <132777.1680012744@warthog.procyon.org.uk>
Date:   Tue, 28 Mar 2023 15:12:24 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jia Zhu <zhujia.zj@...edance.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com,
        linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xin Yin <yinxin.x@...edance.com>,
        Jingbo Xu <jefflexu@...ux.alibaba.com>
Subject: Re: [PATCH V4 3/5] cachefiles: resend an open request if the read request's object is closed

Jia Zhu <zhujia.zj@...edance.com> wrote:

> +	struct cachefiles_object *object =
> +		((struct cachefiles_ondemand_info *)work)->object;

container_of().

> +			continue;
> +		} else if (cachefiles_ondemand_object_is_reopening(object)) {

The "else" is unnecessary.

> +static void ondemand_object_worker(struct work_struct *work)
> +{
> +	struct cachefiles_object *object =
> +		((struct cachefiles_ondemand_info *)work)->object;
> +
> +	cachefiles_ondemand_init_object(object);
> +}

I can't help but feel there's some missing exclusion/locking.  This feels like
it really ought to be driven from the fscache object state machine.