linux-kernel - Re: [Linux-cachefs] [PATCH v3 00/22] fscache, erofs: fscache-based demand-read semantics

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Date:   Thu, 10 Feb 2022 13:58:13 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Jeffle Xu <jefflexu@...ux.alibaba.com>, linux-cachefs@...hat.com,
        xiang@...nel.org, chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        gregkh@...uxfoundation.org, tao.peng@...ux.alibaba.com,
        willy@...radead.org, linux-kernel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        linux-fsdevel@...r.kernel.org, eguan@...ux.alibaba.com,
        gerry@...ux.alibaba.com, torvalds@...ux-foundation.org
Subject: Re: [Linux-cachefs] [PATCH v3 00/22] fscache,  erofs: fscache-based
 demand-read semantics

Hi David,

On Wed, Feb 09, 2022 at 02:00:46PM +0800, Jeffle Xu wrote:

...

> 
> 
> Jeffle Xu (22):
>   fscache: export fscache_end_operation()
>   fscache: add a method to support on-demand read semantics
>   cachefiles: extract generic function for daemon methods
>   cachefiles: detect backing file size in on-demand read mode
>   cachefiles: introduce new devnode for on-demand read mode

...

> 
>  Documentation/filesystems/netfs_library.rst |  18 +
>  fs/cachefiles/Kconfig                       |  13 +
>  fs/cachefiles/daemon.c                      | 243 +++++++++--
>  fs/cachefiles/internal.h                    |  12 +
>  fs/cachefiles/io.c                          |  60 +++
>  fs/cachefiles/main.c                        |  27 ++
>  fs/cachefiles/namei.c                       |  60 ++-

Would you mind taking a review at this version? We follow your previous
advices written in v2 and it reuses almost all cachefiles code except
that it has slightly different implication of cachefile file size and
a new daemon node.

I think it could be as the first step to implement fscache-based
on-demand read.

Thanks,
Gao Xiang