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SubjectRe: Bug?: unlink cause btrfs error but other fs don't
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On 9/4/19 6:48 PM, Josef Bacik wrote:
> On Wed, Sep 04, 2019 at 04:02:24PM +0800, Hongzhi, Song wrote:
>> Hi ,
>>
>>
>> *Kernel:*
>>
>>     After v5.2-rc1, qemux86-64
>>
>>     make -j40 ARCH=x86_64 CROSS_COMPILE=x86-64-gcc
>>     use qemu to bootup kernel
>>
>>
>> *Reproduce:*
>>
>>     There is a test case failed on btrfs but success on other fs(ext4,ext3),
>> see attachment.
>>
>>
>>     Download attachments:
>>
>>         gcc test.c -o myout -Wall -lpthread
>>
>>         copy myout and run.sh to your qemu same directory.
>>
>>         on qemu:
>>
>>             ./run.sh
>>
>>
>>     I found the block device size with btrfs set 512M will cause the error.
>>     256M and 1G all success.
>>
>>
>> *Error info:*
>>
>>     "BTRFS warning (device loop0): could not allocate space for a delete;
>> will truncate on mount"
>>
>>
>> *Related patch:*
>>
>>     I use git bisect to find the following patch introduces the issue.
>>
>>     commit c8eaeac7b734347c3afba7008b7af62f37b9c140
>>     Author: Josef Bacik <josef@toxicpanda.com>
>>     Date:   Wed Apr 10 15:56:10 2019 -0400
>>
>>         btrfs: reserve delalloc metadata differently
>>         ...
>>
>>
> I meant to reply to this but couldn't find the original thread. The patches I
> wrote for this merge window were to address this issue. Thanks,
>
> Josef


Ok, thank your, I will try to search them.

--Hongzhi


>

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