Re: Bug?: unlink cause btrfs error but other fs don't

["Hongzhi, Song" <hongzhi.song@windriver.com>]

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


>