EACCES cmd is Q_QUOTAON, and the quota file pointed to by addr
exists, but is not a regular file or is not on the
filesystem pointed to by special.
EBUSY cmd is Q_QUOTAON, but another Q_QUOTAON had already been
performed.
EFAULT addr or special is invalid.
EINVAL cmd or type is invalid.
EINVAL cmd is Q_QUOTAON, but the specified quota file is
corrupted.
EINVAL (since Linux 5.5)
cmd is Q_XQUOTARM, but addr does not point to valid quota
types.
ENOENT The file specified by special or addr does not exist.
ENOSYS The kernel has not been compiled with the CONFIG_QUOTA
option.
ENOTBLK
special is not a block device.
EPERM The caller lacked the required privilege (CAP_SYS_ADMIN)
for the specified operation.
ERANGE cmd is Q_SETQUOTA, but the specified limits are out of the
range allowed by the quota format.
ESRCH No disk quota is found for the indicated user. Quotas
have not been turned on for this filesystem.
ESRCH cmd is Q_QUOTAON, but the specified quota format was not
found.
ESRCH cmd is Q_GETNEXTQUOTA or Q_XGETNEXTQUOTA, but there is no
ID greater than or equal to id that has an active quota.
