управлять использованием квоты в файловых системах XFS (manage use of quota on XFS filesystems)
Предостережение (Caveat)
The XFS allocation mechanism will always reserve the maximum
amount of space required before proceeding with an allocation.
If insufficient space for this reservation is available, due to
the block quota limit being reached for example, this may result
in the allocation failing even though there is sufficient space.
Quota enforcement can thus sometimes happen in situations where
the user is under quota and the end result of some operation
would still have left the user under quota had the operation been
allowed to run its course. This additional overhead is typically
in the range of tens of blocks.
Both of these properties are unavoidable side effects of the way
XFS operates, so should be kept in mind when assigning block
limits.
