Ошибки - просто вылетает, например браузер, и системное окошко - нет места. Скрина под рукой нет, но думаю все видели. А в логах что-то типа такого:
cat /etc/fstab
UUID=bb1e96f2-c892-4fea-89b6-d0936cfc43c4 / btrfs noatime,max_inline=256,defaults,subvol=@ 0 1
UUID=a184e22f-9fe5-4f49-b1df-43b5d8a15cde /boot ext2 defaults 0 2
UUID=b4a99b3e-4de1-4533-8db7-a32ea8e46db0 /home btrfs noatime,max_inline=256,defaults,subvol=@home 0 2
UUID=b955d7fa-c793-4b55-a06f-f2f7e1398a85 none swap sw 0 0
btrfs fi df /
Data, single: total=29.26GiB, used=16.14GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=1.26GiB, used=315.92MiB
GlobalReserve, single: total=112.00MiB, used=0.00B
btrfs fi us /
Overall:
Device size: 30.52GiB
Device allocated: 30.52GiB
Device unallocated: 0.00B
Device missing: 0.00B
Used: 16.45GiB
Free (estimated): 13.12GiB (min: 13.12GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 112.00MiB (used: 0.00B)
Data,single: Size:29.26GiB, Used:16.14GiB
/dev/sda2 29.26GiB
Metadata,single: Size:1.26GiB, Used:315.92MiB
/dev/sda2 1.26GiB
System,single: Size:4.00MiB, Used:16.00KiB
/dev/sda2 4.00MiB
Unallocated:
/dev/sda2 0.00B
btrfs fi df /home/
Data, single: total=198.84GiB, used=122.59GiB
System, single: total=4.00MiB, used=48.00KiB
Metadata, single: total=1.01GiB, used=755.11MiB
GlobalReserve, single: total=256.00MiB, used=0.00B
btrfs fi us /home/
Overall:
Device size: 199.85GiB
Device allocated: 199.85GiB
Device unallocated: 0.00B
Device missing: 0.00B
Used: 123.33GiB
Free (estimated): 76.25GiB (min: 76.25GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 256.00MiB (used: 0.00B)
Data,single: Size:198.84GiB, Used:122.59GiB
/dev/sda4 198.84GiB
Metadata,single: Size:1.01GiB, Used:755.09MiB
/dev/sda4 1.01GiB
System,single: Size:4.00MiB, Used:48.00KiB
/dev/sda4 4.00MiB
Unallocated:
/dev/sda4 0.00B