linux-kernel - Re: [PATCH v3 1/2] fscache,cachefiles: add prepare_ondemand

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Date:   Wed, 16 Nov 2022 20:17:53 +0800
From:   Jingbo Xu <jefflexu@...ux.alibaba.com>
To:     Jeff Layton <jlayton@...nel.org>, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        linux-cachefs@...hat.com, dhowells@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] fscache,cachefiles: add prepare_ondemand_read()
 callback

Hi Jeff,

Thanks for the comment!

On 11/16/22 7:58 PM, Jeff Layton wrote:

>>  
>> -/*
>> - * Prepare a read operation, shortening it to a cached/uncached
>> - * boundary as appropriate.
>> - */
>> -static enum netfs_io_source cachefiles_prepare_read(struct netfs_io_subrequest *subreq,
>> -						      loff_t i_size)
>> +static enum netfs_io_source cachefiles_do_prepare_read(struct netfs_cache_resources *cres,
>> +					loff_t *_start, size_t *_len,
>> +					unsigned long *_flags, loff_t i_size)
> 
> _start is never changed, so it should be passed by value instead of by
> pointer. 

Yeah, start is indeed unchanged, and I think it's also reasonable to
pass it by value rather than by pointer.


> I'd also reverse the position of the arguments for _flags and
> i_size.  Otherwise, the CPU/compiler have to shuffle things around more
> in cachefiles_prepare_ondemand_read before they call this.

Yeah I didn't notice the details.


I will fix the above two issues in a quick v4 version.

Many thanks for the feedback.



-- 
Thanks,
Jingbo