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Project IDs for Disk Quotas on Exec Directories

docs/DISK-QUOTAS-PROJECTIDS.md

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Project IDs on systemd Systems

Project IDs are needed to enforce disk quotas for Exec Directories. Project IDs are unsigned, 32-bit integers. For disk quota enforcement, the range used is 2147483648 - 4294967294, which is the highest range inspired from UIDS-GUID.md. The range is defined through PROJ_ID_MIN and PROJ_ID_MAX in exec-invoke.c.