linux-kernel - Re: [PATCH 0/5] erofs: basic sub-page compressed data support

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Date:   Thu, 14 Dec 2023 22:58:24 +0800
From:   Chao Yu <chao@...nel.org>
To:     Gao Xiang <hsiangkao@...ux.alibaba.com>,
        linux-erofs@...ts.ozlabs.org
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] erofs: basic sub-page compressed data support

On 2023/12/6 17:10, Gao Xiang wrote:
> Hi folks,
> 
> Recently, there are two new cases so that we need to add a preliminary
> sub-page block support for compressed files;
> 
>   - As Android folks requested, Android ecosystem itself is now switching
>     to 16k page size for their arm64 devices.  They needs an option of
>     4k-block image compatibility on their new 16k devices;
> 
>   - Some arm64 cloud servers use 64k page size for their optimized
>     workloads, but 4k-block EROFS container images need to be parsed too.
> 
> So this patchset mainly addresses the requirements above with a very
> very simple approach as a start: just allocate short-lived temporary
> buffers all the time to keep compressed data if sub-page blocks are
> identified.  In other words, no inplace/cache decompression for
> the preliminary support.
> 
> This patchset survives EROFS stress test on my own testfarms.

Looks good to me, feel free to add:

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,

> 
> Thanks,
> Gao Xiang
> 
> Gao Xiang (5):
>    erofs: support I/O submission for sub-page compressed blocks
>    erofs: record `pclustersize` in bytes instead of pages
>    erofs: fix up compacted indexes for block size < 4096
>    erofs: refine z_erofs_transform_plain() for sub-page block support
>    erofs: enable sub-page compressed block support
> 
>   fs/erofs/decompressor.c |  81 +++++++++------
>   fs/erofs/inode.c        |   6 +-
>   fs/erofs/zdata.c        | 224 ++++++++++++++++++----------------------
>   fs/erofs/zmap.c         |  32 +++---
>   4 files changed, 169 insertions(+), 174 deletions(-)
>