On 18/02/2026 14:31, Carsten Grzemba via illumos-discuss wrote:
Because I havn't found an chproj command in Illumos or Solaris.  Are there still use cases for project Id's in files or filesystems? Which filesystems support project Id's? Where project Id of a file/ filesystem is stored. Or is this feature only available in filesystems which support extended attributes?

Can anyone help with information here?


I see a feature@project_quota in newer zpools:

 project_quota
    GUID                  org.zfsonlinux:project_quota
    DEPENDENCIES          extensible_dataset
    READ-ONLY COMPATIBLE  yes

    This feature allows administrators to account the spaces and
    objects usage information against the project identifier (ID).

    The project ID is an object-based attribute.  When upgrading an
    existing filesystem, objects without a project ID will be
    assigned a zero project ID.  When this feature is enabled, newly
    created objects inherit their parent directories' project ID if
    the parent's inherit flag is set (via chattr [+-]P or zfs project
    -s|-C).  Otherwise, the new object's project ID will be zero.  An
    object's project ID can be changed at any time by the owner (or
    privileged user) via chattr -p prjid or zfs project -p prjid.

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