Oracle Solaris ZFS File System (MOSC)

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Immutable Labeled Zones

in Oracle Solaris ZFS File System (MOSC)

As products evolve tradeoffs are made to take advantage of new technologies. For example, Trusted Solaris had a feature called multilevel home directories in which an instance of /home/bob would be created for each label within bob's clearance. This polyinstantiation was implemented through a custom version of UFS using hidden pathname adornments. 

The Trusted Extensions functionality, which was first integrated into Oracle Solaris 10 used labeled zones to polyinstantiate home directories. Since each labeled zone had a unique set of home directories, no special filesystem extensions were required. Over time this simplification was recognized as insufficiently flexible, so per-file labeling

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