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Date: Tue, 25 Feb 2014 18:49:52 +0200
From: Marcus Sundman <sundman@iki.fi>
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To: linux-btrfs@vger.kernel.org
Subject: No space left on device (again)
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Hi

I get "No space left on device" and it is unclear why:

> # df -h|grep sda3
> /dev/sda3       413G  368G   45G  90% /home
> # btrfs filesystem show /dev/sda3
> Label: 'home'  uuid: 46279061-51f4-40c2-afd0-61d6faab7f60
>     Total devices 1 FS bytes used 371.11GB
>     devid    1 size 412.54GB used 412.54GB path /dev/sda3
>
> Btrfs v0.20-rc1
> # btrfs filesystem df /home
> Data: total=410.52GB, used=369.61GB
> System: total=4.00MB, used=64.00KB
> Metadata: total=2.01GB, used=1.50GB
> #

So, 'data' and 'metadata' seem to be fine(?), but 'system' is a bit low. 
Is that it? If so, can I do something about it? Or should I look 
somewhere else?

I really wish I could get a warning before running out of disk space, 
instead of everything breaking suddenly when there seems to be lots and 
lots of space left.

- Marcus