linux-kernel - Re: [v2] cachefiles: fix error return code in cachefiles_ondemand

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Date:   Thu, 18 Aug 2022 20:15:37 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     Sun Ke <sunke32@...wei.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: [v2] cachefiles: fix error return code in
 cachefiles_ondemand_copen()



On 8/18/22 7:27 PM, Sun Ke wrote:
> 
> 
> 在 2022/8/18 19:14, JeffleXu 写道:
>>
>>
>> On 8/18/22 7:19 PM, Sun Ke wrote:
>>> If size < 0; open request will fail, but cachefiles_ondemand_copen
>>> return 0.
>>> Fix to return a negative error code.
>>
>> Could you please also update the commit log?
> 
> 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. However, return 0 is indeed unexpected when
				   ^
				returning

> cache_size is an invalid error code.

> Fix to return a negative error code.

Fix this by returning error when cache_size is an invalid error code.


>>
>> Otherwise LGTM.
>>
>> Reviewed-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
>>
>>
>> BTW, also cc linux-fsdevel@...r.kernel.org
>>
>>>
>>> Fixes: c8383054506c ("cachefiles: notify the user daemon when looking
>>> up cookie")
>>> Signed-off-by: Sun Ke <sunke32@...wei.com>
>>> ---
>>>   fs/cachefiles/ondemand.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
>>> index 1fee702d5529..ea8a1e8317d9 100644
>>> --- a/fs/cachefiles/ondemand.c
>>> +++ b/fs/cachefiles/ondemand.c
>>> @@ -159,7 +159,7 @@ int cachefiles_ondemand_copen(struct
>>> cachefiles_cache *cache, char *args)
>>>       /* fail OPEN request if daemon reports an error */
>>>       if (size < 0) {
>>>           if (!IS_ERR_VALUE(size))
>>> -            size = -EINVAL;
>>> +            ret = size = -EINVAL;
>>>           req->error = size;
>>>           goto out;
>>>       }
>>

-- 
Thanks,
Jingbo