dquotmax & dquotnr

file: /proc/sys/fs/dquotmax & dquotnr
variable: fs.dquotmax & dquotnr
Official reference

The file dquot-max shows the maximum number of cached disk quota entries.

The file dquot-nr shows the number of allocated disk quota entries and the number of free disk quota entries.

If the number of free cached disk quotas is very low and you have some awesome number of simultaneous system users, you might want to raise the limit.