[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
--xsdg
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