...appings for a user namespace. (Project IDs are used for disk quotas; see setquota (8) and quotactl (2).) Project ID mappings are defined by writing to the /proc/ pid /projid_map…...kernel developers below. • Perform a range of system administration operations including: quotactl (2), mount (2), umount (2), pivot_root (2), swapon (2), swapoff (2), sethostna…