On Thu, Jun 2, 2016 at 1:45 PM, Omari Stephens <xsdg@xxxxxxxx> wrote:
> [Note: not on list; please reply-all]
>
> I've read everything I can find about running out of space on btrfs, and it
> hasn't helped. I'm currently dead in the water.
>
> Everything I do seems to make the problem monotonically worse — I tried
> adding a loopback device to the fs, and now I can't remove it. Then I tried
> adding a real device (mSATA) to the fs and now I still can't remove the
> loopback device (which is making everything super slow), and I also can't
> remove the mSATA. I've removed about 100GB from the filesystem and that
> hasn't done anything either.
>
> Is there anything I can to do even figure out how bad things are, what I
> need to do to make any kind of forward progress? This is a laptop, so I
> don't want to add an external drive only to find out that I can't remove it
> without corrupting my filesystem.
>
> ### FILESYSTEM STATE
> 19:23:14> [root{slobol}@/home/xsdg]
> #btrfs fi show /home
> Label: none uuid: 4776be5b-5058-4248-a1b7-7c213757dfbd
> Total devices 3 FS bytes used 221.02GiB
> devid 1 size 418.72GiB used 413.72GiB path /dev/sda3
> devid 2 size 10.00GiB used 5.00GiB path /dev/loop0
> devid 3 size 14.91GiB used 3.00GiB path /dev/sdb1
>
>
> 19:23:33> [root{slobol}@/home/xsdg]
> #btrfs fi usage /home
> Overall:
> Device size: 443.63GiB
> Device allocated: 421.72GiB
> Device unallocated: 21.91GiB
> Device missing: 0.00B
> Used: 221.68GiB
> Free (estimated): 219.24GiB (min: 208.29GiB)
> Data ratio: 1.00
> Metadata ratio: 2.00
> Global reserve: 228.00MiB (used: 36.00KiB)
>
> Data,single: Size:417.69GiB, Used:220.36GiB
> /dev/loop0 5.00GiB
> /dev/sda3 409.69GiB
> /dev/sdb1 3.00GiB
>
> Metadata,single: Size:8.00MiB, Used:0.00B
> /dev/sda3 8.00MiB
>
> Metadata,DUP: Size:2.00GiB, Used:674.45MiB
> /dev/sda3 4.00GiB
>
> System,single: Size:4.00MiB, Used:0.00B
> /dev/sda3 4.00MiB
>
> System,DUP: Size:8.00MiB, Used:56.00KiB
> /dev/sda3 16.00MiB
>
> Unallocated:
> /dev/loop0 5.00GiB
> /dev/sda3 5.00GiB
> /dev/sdb1 11.91GiB
>
>
> ### BALANCE FAILS, EVEN WITH -dusage=0
> 19:23:02> [root{slobol}@/home/xsdg]
> #btrfs balance start -v -dusage=0 .
> Dumping filters: flags 0x1, state 0x0, force is off
> DATA (flags 0x2): balancing, usage=0
> ERROR: error during balancing '.': No space left on device
> There may be more info in syslog - try dmesg | tail
>
>
> ### CAN'T REMOVE DEVICES -> ENOSPC
> #btrfs device remove /dev/loop0 /home
> ERROR: error removing device '/dev/loop0': No space left on device
Well the big problem here is that it's a loop device so even if it
were a known/fixed bug you're stuck being unable to boot; well, except
you could add a big enough device, convert to raid1, and reboot with
rootflags=degraded.
I'd use the external to make a backup, and start planning to make a
new fs, at least until someone else with a better idea arrives on
scene.
--
Chris Murphy
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