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Re: [PATCH for-4.2 v2 3/3] block/file-posix: Let post-EOF fallocate seri

From: Max Reitz
Subject: Re: [PATCH for-4.2 v2 3/3] block/file-posix: Let post-EOF fallocate serialize
Date: Thu, 14 Nov 2019 18:16:22 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1

On 14.11.19 18:15, Max Reitz wrote:
> On 14.11.19 17:27, Christoph Hellwig wrote:
>> On Fri, Nov 01, 2019 at 04:25:10PM +0100, Max Reitz wrote:
>>> The XFS kernel driver has a bug that may cause data corruption for qcow2
>>> images as of qemu commit c8bb23cbdbe32f.  We can work around it by
>>> treating post-EOF fallocates as serializing up until infinity (INT64_MAX
>>> in practice).
>> This has been fixed in the kernel a while ago.  I don't think it makes
>> sense to work around it in qemu.
> Has it?  It was my understanding that this is fixed by
> https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git/commit/?h=for-next&id=249bd9087a5264d2b8a974081870e2e27671b4dcwhich

Sorry, broke the link.  Let me try again:



> has been merged only very recently and is on track to be part of Linux
> 5.5, as far as I understand.
> Max

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