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From: Gao Xiang <hsiangkao@redhat.com>
To: 胡玮文 <sehuww@mail.scut.edu.cn>
Cc: linux-erofs@lists.ozlabs.org
Subject: Re: [PATCH] erofs-utils: fix battach on full buffer block
Date: Tue, 19 Jan 2021 23:43:35 +0800	[thread overview]
Message-ID: <20210119154335.GB2601261@xiangao.remote.csb> (raw)
In-Reply-To: <20210119060256.GA7664@DESKTOP-N4CECTO.huww98.cn>

Hi Weiwen,

On Tue, Jan 19, 2021 at 02:02:56PM +0800, 胡玮文 wrote:
> Hi Xiang,
> 
> After further investgate, this bug will not reveal in any released version of
> mkfs.erofs. Previous patch v5 [1] will map all allocated bb when erofs_mapbh()
> is called on an already mapped bb, which triggers this bug. before that patch,
> under the same condition, __erofs_battach() will only be called on bb which is
> not mapped, thus no need to update `tail_blkaddr'.

Good to know this, thanks! I haven't looked into that (I will test it this
weekend.) IMO, although this is not a regression, yet it seems it's potential
harmful if we didn't notice this... So I think a proper testcase is still
useful to look after this... If you have extra time, could you help on it?

Also, without the detail of this, I think the fix might be folded into
the original patchset (could you resend it?). In addition, I think after
last_mapped_block is introduced, we might not need tail_blkaddr anymore,
not sure. But I'm very cautious about this in case of introducing any
new regression...

Thanks,
Gao Xiang

> 
> [1]: https://lore.kernel.org/linux-erofs/20210118123431.22533-1-sehuww@mail.scut.edu.cn/
> 
> Hu Weiwen
> 


  reply	other threads:[~2021-01-19 15:44 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-18 12:39 Hu Weiwen
2021-01-18 13:59 ` Gao Xiang
2021-01-18 15:52   ` 胡玮文
2021-01-18 23:28     ` Gao Xiang
2021-01-19  6:02   ` 胡玮文
2021-01-19 15:43     ` Gao Xiang [this message]
2021-01-20  4:57       ` 胡玮文
2021-01-20  5:12         ` Gao Xiang
2021-01-21  6:07           ` 胡玮文
2021-01-21  7:22             ` 胡玮文
2021-01-21  9:22             ` Gao Xiang
2021-01-21 16:26           ` [PATCH v2] " Hu Weiwen
2021-01-22  2:31             ` Gao Xiang
2021-01-22 12:43             ` Gao Xiang
2021-02-14 15:22             ` Gao Xiang via Linux-erofs
2021-02-14 16:00             ` [PATCH v3] erofs-utils: fix battach on full buffer blocks Gao Xiang via Linux-erofs
2021-02-22 15:34               ` Li GuiFu via Linux-erofs

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