User disk quota accounting enabled, and limits (optionally) enforced.

mount -o uquota device mountpoint

Group disk quota accounting enabled, and limits (optionally) enforced.

mount -o grpquota device mountpoint

Project quota accounting enabled, and limits (optionally) enforced.

mount -o prjquota device mountpoint

Can optionally specify uqnoenforce, gqnoenforce and pqnoenforce to use soft limits.