Re: BTRFS: space_info 4 has 18446742286429913088 free, is not full

[Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>]

hello,

On 09/28/2016 08:02 PM, Stefan Priebe - Profihost AG wrote:
> Hi Xiaoguang Wang,
>
> Am 28.09.2016 um 13:35 schrieb Wang Xiaoguang:
>> hello,
>>
>> On 09/28/2016 07:15 PM, Stefan Priebe - Profihost AG wrote:
>>> Dear list,
>>>
>>> is there any chance anybody wants to work with me on the following issue?
>> Though I'm also somewhat new to btrfs, but I'd like to.
>>
>>> BTRFS: space_info 4 has 18446742286429913088 free, is not full
>>> BTRFS: space_info total=98247376896, used=77036814336, pinned=0,
>>> reserved=0, may_use=1808490201088, readonly=0
>>>
>>> i get this nearly every day.
>>>
>>> Here are some msg collected from today and yesterday from different
>>> servers:
>>> | BTRFS: space_info 4 has 18446742182612910080 free, is not full |
>>> | BTRFS: space_info 4 has 18446742254739439616 free, is not full |
>>> | BTRFS: space_info 4 has 18446743980225085440 free, is not full |
>>> | BTRFS: space_info 4 has 18446743619906420736 free, is not full |
>>> | BTRFS: space_info 4 has 18446743647369576448 free, is not full |
>>> | BTRFS: space_info 4 has 18446742286429913088 free, is not full
>>>
>>> What i tried so far without success:
>>> - use vanilla 4.8-rc8 kernel
>>> - use latest vanilla 4.4 kernel
>>> - use latest 4.4 kernel + patches from holger hoffstaette
>>> - use clear_cache,space_cache=v2
>>> - use clear_cache,space_cache=v1
>>>
>>> But all tries result in ENOSPC after a short period of time doing
>>> backups.
>> I also met enospc error in 4.8-rc6 when doing big files create and
>> delete tests,
>> for my cases, I have written some patches to fix it.
>> Would you please apply my patches to have a try:
>> btrfs: try to satisfy metadata requests when every flush_space() returns
>> btrfs: try to write enough delalloc bytes when reclaiming metadata space
>> btrfs: make shrink_delalloc() try harder to reclaim metadata space
>> You can find them in btrfs mail list.
> those are already in the patchset from holger:
>
> So i have these in my testing patchset (latest 4.4 kernel + patches from
> holger hoffstaette):
>
> btrfs-20160921-try-to-satisfy-metadata-requests-when-every-flush_space()-returns.patch
>
> btrfs-20160921-try-to-write-enough-delalloc-bytes-when-reclaiming-metadata-space.patch
>
> btrfs-20160922-make-shrink_delalloc()-try-harder-to-reclaim-metadata-space.patch
OK, I see.
But given that you often run into enospc errors, can you work out a 
reproduce
script according to you work load. That will give us great help.

Reagrds,
Xiaoguang Wang

>
> Greets,
> Stefan
>
>> Regards,
>> Xiaoguang Wang
>>> Greets,
>>> Stefan
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>>
>>
>