контролировать состояние глобальной квоты файловой системы btrfs (control the global quota status of a btrfs filesystem)
Описание (Description)
The commands under btrfs quota are used to affect the global
status of quotas of a btrfs filesystem. The quota groups
(qgroups) are managed by the subcommand btrfs qgroup(8).
Note
Qgroups are different than the traditional user quotas and
designed to track shared and exclusive data per-subvolume.
Please refer to the section HIERARCHICAL QUOTA GROUP CONCEPTS
for a detailed description.
PERFORMANCE IMPLICATIONS
When quotas are activated, they affect all extent processing,
which takes a performance hit. Activation of qgroups is not
recommended unless the user intends to actually use them.
STABILITY STATUS
The qgroup implementation has turned out to be quite difficult as
it affects the core of the filesystem operation. Qgroup users
have hit various corner cases over time, such as incorrect
accounting or system instability. The situation is gradually
improving and issues found and fixed.
