On 17.04.2018 19:08, Matthew Lai wrote:
> Hello!
>
> I am getting ENOSPC on my root filesystem with plenty of unallocated
> space according to "fi usage". Any idea why that may be? This is a root
> partition for Debian Stable. Not doing anything unusual that I'm aware
> of. No snapshots.
>
> Thanks!
>
> Matthew
>
> uname -a:
> Linux bigfoot 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3+deb9u1 (2017-12-23)
> x86_64 GNU/Linux
>
> btrfs --version:
> btrfs-progs v4.7.3
>
> btrfs fi show:
> Label: none uuid: 2364c63f-e20c-410f-90b4-05f722ee1c77
> Total devices 1 FS bytes used 176.27GiB
> devid 1 size 246.33GiB used 185.01GiB path /dev/sda2
>
> btrfs fi df /:
> Data, single: total=183.00GiB, used=175.78GiB
> System, single: total=4.00MiB, used=48.00KiB
> Metadata, single: total=2.01GiB, used=504.81MiB
> GlobalReserve, single: total=211.39MiB, used=0.00B
>
You haven't shown "btrfs fi usage". In any case there were some patches
in more recent kernels which deal with premature ENOSPC:
996478ca9c46 ("btrfs: change how we decide to commit transactions during
flushing")
17024ad0a0fd ("Btrfs: fix early ENOSPC due to delalloc")
I'd advise you update to 4.14 stable. Otherwise running:
git log --oneline --grep "enospc" fs/btrfs/
will shows you likely candidates.
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