linux-kernel - Re: [PATCH v7] erofs: add 'fsoffset' mount option to specify filesystem offset

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Message-ID: <60a7cad0-a415-41aa-b270-5b218d45d720@linux.alibaba.com>
Date: Sat, 17 May 2025 21:38:02 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Sheng Yong <shengyong2021@...il.com>, xiang@...nel.org, chao@...nel.org,
 zbestahu@...il.com, jefflexu@...ux.alibaba.com, dhavale@...gle.com,
 lihongbo22@...wei.com
Cc: linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 Sheng Yong <shengyong1@...omi.com>, Wang Shuai <wangshuai12@...omi.com>
Subject: Re: [PATCH v7] erofs: add 'fsoffset' mount option to specify
 filesystem offset



On 2025/5/17 17:05, Sheng Yong wrote:
> From: Sheng Yong <shengyong1@...omi.com>
> 
> When attempting to use an archive file, such as APEX on android,
> as a file-backed mount source, it fails because EROFS image within
> the archive file does not start at offset 0. As a result, a loop
> or a dm device is still needed to attach the image file at an
> appropriate offset first. Similarly, if an EROFS image within a
> block device does not start at offset 0, it cannot be mounted
> directly either.
> 
> To address this issue, this patch adds a new mount option `fsoffset=x'
> to accept a start offset for the primary device. The offset should be
> aligned to the block size. EROFS will add this offset before performing
> read requests.
> 
> Signed-off-by: Sheng Yong <shengyong1@...omi.com>
> Signed-off-by: Wang Shuai <wangshuai12@...omi.com>

Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

Thanks,
Gao Xiang