linux-kernel - Re: [PATCH v2 00/20] fscache,erofs: fscache-based demand-read semantics

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Message-ID: <8f73d28e-db30-f2e4-0143-9d75c4b13087@linux.alibaba.com>
Date:   Thu, 27 Jan 2022 15:07:00 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-cachefs@...hat.com, xiang@...nel.org, chao@...nel.org,
        linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        tao.peng@...ux.alibaba.com, gerry@...ux.alibaba.com,
        eguan@...ux.alibaba.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/20] fscache,erofs: fscache-based demand-read
 semantics



On 1/26/22 4:51 PM, David Howells wrote:
> JeffleXu <jefflexu@...ux.alibaba.com> wrote:
> 
>> "/path/to/file+offset"
>> 		^
>>
>> Besides, what does the 'offset' mean?
> 
> Assuming you're storing multiple erofs files within the same backend file, you
> need to tell the the cache backend how to find the data.  Assuming the erofs
> data is arranged such that each erofs file is a single contiguous region, then
> you need a pathname and a file offset to find one of them.
> 

Alright. In fact one erofs file can contain multiple chunks, which can
correspond to different backing blob files. Thus currently I will use
fscache_read() directly, to push this feature forward.

Thanks a lot.


-- 
Thanks,
Jeffle