From: Song Liu <song@kernel.org>
To: Xiao Ni <xni@redhat.com>
Cc: Song Liu <songliubraving@fb.com>,
Matthew Ruffell <matthew.ruffell@canonical.com>,
linux-raid <linux-raid@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>, Coly Li <colyli@suse.de>,
Guoqing Jiang <guoqing.jiang@cloud.ionos.com>,
"khalid.elmously@canonical.com" <khalid.elmously@canonical.com>,
Jay Vosburgh <jay.vosburgh@canonical.com>
Subject: Re: PROBLEM: Recent raid10 block discard patchset causes filesystem corruption on fstrim
Date: Sun, 27 Dec 2020 13:57:12 -0800 [thread overview]
Message-ID: <CAPhsuW5Fs9Zz+-2ZEZQe3g5jen4SiHNf7sRtYCN0w4TBGZ1Vsw@mail.gmail.com> (raw)
In-Reply-To: <a85943ed-60d4-05ad-9f6d-d76324fa5538@redhat.com>
Hi Xiao,
On Thu, Dec 24, 2020 at 2:18 AM Xiao Ni <xni@redhat.com> wrote:
>
>
>
[...]
>
> [ 789.709501] discard bio start : 70968, size : 191176
> [ 789.709507] first stripe index 69, start disk index 0, start disk
> offset 70968
> [ 789.709509] last stripe index 256, end disk index 0, end disk offset
> 262144
> [ 789.709511] disk 0, dev start : 70968, dev end : 262144
> [ 789.709515] disk 1, dev start : 70656, dev end : 262144
>
> For example, in this test case, it has 2 near copies. The
> start_disk_offset for the first disk is 70968.
> It should use the same offset address for second disk. But it uses the
> start address of this chunk.
> It discard more region. The patch in the attachment can fix this
> problem. It split the region that
> doesn't align with chunk size.
>
> There is another problem. The stripe size should be calculated
> differently for near layout and far layout.
>
> @Song, do you want me to use a separate patch for this fix, or fix this
> in the original patch?
Please fold in the changes in the original patches and resend the whole
set.
Thanks,
Song
>
> Merry Christmas
> Xiao
>
next prev parent reply other threads:[~2020-12-27 21:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 3:46 PROBLEM: Recent raid10 block discard patchset causes filesystem corruption on fstrim Matthew Ruffell
2020-12-09 4:17 ` Song Liu
2020-12-09 22:04 ` Song Liu
2020-12-10 1:35 ` Xiao Ni
2020-12-24 10:18 ` Xiao Ni
2020-12-27 21:57 ` Song Liu [this message]
2021-02-02 3:42 ` Matthew Ruffell
2021-02-03 1:43 ` Xiao Ni
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