linux-kernel - Re: [PATCH V2 3/5] cachefiles: resend an open request if the read request's object is closed

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Message-ID: <5ca5d4bd-63b4-12e9-39cd-7580958980db@linux.alibaba.com>
Date:   Fri, 14 Oct 2022 14:31:29 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     Jia Zhu <zhujia.zj@...edance.com>, dhowells@...hat.com,
        xiang@...nel.org
Cc:     linux-cachefs@...hat.com, linux-erofs@...ts.ozlabs.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        yinxin.x@...edance.com
Subject: Re: [PATCH V2 3/5] cachefiles: resend an open request if the read
 request's object is closed



On 10/14/22 11:07 AM, Jia Zhu wrote:

> +/*
> + * Reopen the closed object with associated read request.

I think "Reopen the closed object if there's any inflight or subsequent
READ request on this object" would be better?

> + * Skip read requests whose related object are reopening.
					       ^
					      is ?


> @@ -277,14 +308,18 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
>  	xa_unlock(&cache->reqs);
>  
>  	id = xas.xa_index;
> -	msg->msg_id = id;
>  
>  	if (msg->opcode == CACHEFILES_OP_OPEN) {
>  		ret = cachefiles_ondemand_get_fd(req);
> -		if (ret)
> +		if (ret) {
> +			cachefiles_ondemand_set_object_close(req->object);
>  			goto error;
> +		}
>  	}
>  
> +	msg->msg_id = id;
> +	msg->object_id = req->object->private->ondemand_id;

Since currently msg->object_id is always assigned in
cachefiles_ondemand_daemon_read(), we can remove the assignment in
cachefiles_ondemand_get_fd().


Otherwise LGTM.

Reviewed-by: Jingbo Xu <jefflexu@...ux.alibaba.com>

-- 
Thanks,
Jingbo