linux-kernel - Re: [PATCH] cachefiles: fix error return code in cachefiles_ondemand

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Message-ID: <1ee8458c-9200-7ad8-8497-a142df2bbe0b@huawei.com>
Date:   Thu, 18 Aug 2022 19:02:46 +0800
From:   Sun Ke <sunke32@...wei.com>
To:     JeffleXu <jefflexu@...ux.alibaba.com>, <dhowells@...hat.com>
CC:     <linux-cachefs@...hat.com>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] cachefiles: fix error return code in
 cachefiles_ondemand_copen()



在 2022/8/18 18:47, JeffleXu 写道:
> 
> 
> On 8/18/22 5:49 PM, Sun Ke wrote:
>> If size < 0; open request will fail, but cachefiles_ondemand_copen return 0.
> 
> Hi, this is a deliberate design. The cache_size field of copen is
> specified by the user daemon. If cache_size < 0, then the OPEN request
> is expected to fail, while copen itself shall succeed.
> 
>> Fix to return a negative error code.
>>
>> Fixes: c8383054506c ("cachefiles: notify the user daemon when looking up cookie")
>> Signed-off-by: Sun Ke <sunke32@...wei.com>
>> ---
>>   fs/cachefiles/ondemand.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
>> index 1fee702d5529..a31d3ff0ce5f 100644
>> --- a/fs/cachefiles/ondemand.c
>> +++ b/fs/cachefiles/ondemand.c
>> @@ -161,6 +161,7 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args)
>>   		if (!IS_ERR_VALUE(size))
>>   			size = -EINVAL;
> 
> However, it is indeed unexpected when cache_size is an invalid error
> code. How about:
> 
> 		if (!IS_ERR_VALUE(size))
> -			size= -EINVAL;
> +			ret = size = -EINVAL;
> 		req->error = size;
> 		goto out;
> 	}

OK, I will send a v2 patch.

Thanks,
Sun Ke
> 
>>   		req->error = size;
>> +		ret = -EINVAL;
>>   		goto out;
>>   	}
>>   
>