linux-kernel - Re: [PATCH v15 0/9] erofs: Introduce page cache sharing feature

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Message-ID: <dd20d5d5-3623-40ff-8462-3a36f3b116ed@huawei.com>
Date: Mon, 19 Jan 2026 09:23:34 +0800
From: Hongbo Li <lihongbo22@...wei.com>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>, Christoph Hellwig <hch@....de>
CC: <chao@...nel.org>, <brauner@...nel.org>, <djwong@...nel.org>,
	<amir73il@...il.com>, <linux-fsdevel@...r.kernel.org>,
	<linux-erofs@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v15 0/9] erofs: Introduce page cache sharing feature

Thanks for comments and attention.

So in short: Two files with identical content fingerprints 
(user-defined, such as sha256) will share the same page cache which 
associated with an anonymous inode. Data operations are redirected to 
the anonymous inode while metadata operations (include locating the data 
position on disk) are still performed on the original inode(realinode).

Sorry for the ambiguous annotation, and I will refine the cover-letter 
in next iteration to make it clear as possible.

Thanks,
Hongbo

On 2026/1/17 0:43, Gao Xiang wrote:
> 
> 
> On 2026/1/16 23:36, Christoph Hellwig wrote:
> 
>>
>> Also do you have a git tree for the whole feature?
> 
> I prepared a test tree for Hongbo but it's v14:
> https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git/log/?h=erofs/pagecache-share
> 
> I think v15 is almost close to the final status,
> I hope Hongbo addresses your comment and I will
> review the remaining parts too and apply to
> linux-next at the beginning of next week.
> 
> Thanks,
> Gao Xiang