From: Li GuiFu via Linux-erofs <linux-erofs@lists.ozlabs.org>
To: Gao Xiang <xiang@kernel.org>,
linux-erofs@lists.ozlabs.org, Li Guifu <bluce.liguifu@huawei.com>
Subject: Re: [PATCH v4 4/5] erofs-utils: zero out garbage trailing data for non-0padding cases
Date: Sat, 1 May 2021 00:17:24 +0800 [thread overview]
Message-ID: <ea990fb8-1aae-b697-b766-aab8592f46d2@aliyun.com> (raw)
In-Reply-To: <20210430040345.17120-4-xiang@kernel.org>
On 2021/4/30 12:03, Gao Xiang wrote:
> When "-E legacy-compress" is used, lz4 0padding feature will be
> disabled by default in order to support old kernels (< Linux v5.3).
>
> In that case, the current mkfs leaves previous garbage data after
> valid compressed data if the length becomes shorter. This doesn't
> matter for kernels >= v5.0 since LZ4_decompress_safe_partial() is used.
>
> However, for staging erofs v4.19, it used an in-house customized
> lz4 implemention due to LZ4_decompress_safe_partial() didn't work
> as expected at that time, yet it doesn't allow trailing random
> data in practice or decompression failure could happen.
>
> I don't think it really matters since "obsoleted_mkfs" works perfectly
> for such old staging versions (v4.19). Anyway, trailing garbage data
> sounds unreasonable, so let's zero out it now.
>
> Fixes: 66653ef10a7f ("erofs-utils: introduce compression for regular files")
> Signed-off-by: Gao Xiang <xiang@kernel.org>
> ---
> lib/compress.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
>
It looks good
Reviewed-by: Li Guifu <bluce.lee@aliyun.com>
Thanks,
next prev parent reply other threads:[~2021-04-30 16:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-30 4:03 [PATCH v4 1/5] erofs-utils: sync up with in-kernel erofs_fs.h Gao Xiang
2021-04-30 4:03 ` [PATCH v4 2/5] erofs-utils: warn out experimental big pcluster Gao Xiang
2021-04-30 16:16 ` Li GuiFu via Linux-erofs
2021-04-30 4:03 ` [PATCH v4 3/5] erofs-utils: manpage: add missing -C option for " Gao Xiang
2021-04-30 16:16 ` Li GuiFu via Linux-erofs
2021-04-30 4:03 ` [PATCH v4 4/5] erofs-utils: zero out garbage trailing data for non-0padding cases Gao Xiang
2021-04-30 16:17 ` Li GuiFu via Linux-erofs [this message]
2021-04-30 4:03 ` [PATCH v4 5/5] erofs-utils: manpage: add manual for erofsfuse Gao Xiang
2021-04-30 16:17 ` Li GuiFu via Linux-erofs
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