linux-kernel - Re: [PATCH 02/12] cachefiles: remove err_put_fd tag in cachefiles_ondemand_daemon

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Date: Mon, 6 May 2024 12:02:48 +0800
From: Baokun Li <libaokun@...weicloud.com>
To: Jingbo Xu <jefflexu@...ux.alibaba.com>, netfs@...ts.linux.dev
Cc: dhowells@...hat.com, jlayton@...nel.org, zhujia.zj@...edance.com,
 linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, libaokun@...weicloud.com,
 yangerkun <yangerkun@...wei.com>
Subject: Re: [PATCH 02/12] cachefiles: remove err_put_fd tag in
 cachefiles_ondemand_daemon_read()

On 2024/5/6 11:55, Jingbo Xu wrote:
>
> On 4/24/24 11:39 AM, libaokun@...weicloud.com wrote:
>> From: Baokun Li <libaokun1@...wei.com>
>>
>> The err_put_fd tag is only used once, so remove it to make the code more
>> readable.
> I think it's a conventional style to put error handling in the bottom of
> the function so that it could be reused.  Indeed currently err_put_fd
> has only one caller but IMHO it's only styling issues.
>
> By the way it seems that this is not needed anymore if patch 9 is applied.
This is just to make patch 3 look clearer, if you insist on dropping it
I will drop it in the next revision.

Cheers,
Baokun
>> ---
>>   fs/cachefiles/ondemand.c | 7 +++----
>>   1 file changed, 3 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
>> index 4ba42f1fa3b4..fd49728d8bae 100644
>> --- a/fs/cachefiles/ondemand.c
>> +++ b/fs/cachefiles/ondemand.c
>> @@ -347,7 +347,9 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
>>   
>>   	if (copy_to_user(_buffer, msg, n) != 0) {
>>   		ret = -EFAULT;
>> -		goto err_put_fd;
>> +		if (msg->opcode == CACHEFILES_OP_OPEN)
>> +			close_fd(((struct cachefiles_open *)msg->data)->fd);
>> +		goto error;
>>   	}
>>   
>>   	/* CLOSE request has no reply */
>> @@ -358,9 +360,6 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
>>   
>>   	return n;
>>   
>> -err_put_fd:
>> -	if (msg->opcode == CACHEFILES_OP_OPEN)
>> -		close_fd(((struct cachefiles_open *)msg->data)->fd);
>>   error:
>>   	xa_erase(&cache->reqs, id);
>>   	req->error = ret;