quotas and qgroups

Enable Quotas: sudo btrfs quota enable Disable Quotas: sudo btrfs quota disable

1. Setting Limits Quotas are managed by “qgroups” (quota groups), which form a hierarchy.

   Set Limit: sudo btrfs qgroup limit (e.g., sudo btrfs qgroup limit 20G /mnt/my-subvol) Remove Limit: Set the size to none Setting Limits on Subvolumes: Limits can be set on existing subvolumes or even before they are created.

2. Viewing Quota Information

   Show Detailed Usage: sudo btrfs qgroup show -pcre Raw Output (Bytes): sudo btrfs qgroup show --raw

btrfs filesystem du -s .

Wont umount

try lazy umount

umount -l [mountpoint]

find process using mount

lsof +f -- [mountpoint] (– just terminates lsof looking for parameters)

No data copy-on-write (CoW)

Must be done on the directory level to be inherited by it’s children.

This can be done with chattr +C /mnt/subvol.

Only new files affected ofcourse.