linux-kernel - Re: [PATCH RFC] fs: erofs: support PG_mappedtodisk flag for folios with zero-filled

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Message-ID: <0fa18bcf-9af6-4c99-ad57-613fa38ff741@linux.alibaba.com>
Date: Thu, 17 Oct 2024 16:00:14 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Barry Song <21cnbao@...il.com>, xiang@...nel.org, chao@...nel.org,
 linux-erofs@...ts.ozlabs.org
Cc: huyue2@...lpad.com, jefflexu@...ux.alibaba.com, dhavale@...gle.com,
 linux-kernel@...r.kernel.org, Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH RFC] fs: erofs: support PG_mappedtodisk flag for folios
 with zero-filled



On 2024/10/17 15:58, Gao Xiang wrote:
> Hi Barry,
> 
> On 2024/10/17 15:43, Barry Song wrote:
>> From: Barry Song <v-songbaohua@...o.com>
>>
>> When a folio has never been zero-filled, mark it as mappedtodisk
>> to allow other software components to recognize and utilize the
>> flag.
>>
>> Signed-off-by: Barry Song <v-songbaohua@...o.com>
> 
> Thanks for this!
> 
> It looks good to me as an improvement as long as PG_mappedtodisk
> is long-term lived and useful to users.
> 
> Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

BTW, I wonder if iomap supports this since uncompressed EROFS
relies on iomap paths...

Thanks,
Gao Xiang