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    SubjectRe: [RFC v7 15/41] richacl: Automatic Inheritance
    From
    2015-09-18 20:40 GMT+02:00 J. Bruce Fields <bfields@fieldses.org>:
    > On Sat, Sep 05, 2015 at 12:27:10PM +0200, Andreas Gruenbacher wrote:
    >> Automatic Inheritance (AI) allows changes to the acl of a directory to
    > In the above "file" sometimes means "any object" and somethings "a
    > non-directory". I can sort it out, but more consistent terminology
    > would help.

    Okay, I'll fix it.

    >> Linux does not have a way of creating files without setting the file
    >> permission bits, so all files created inside a directory with
    >> RICHACL_AUTO_INHERIT set will have the RICHACL_PROTECTED flag set. This
    >> effectively disables Automatic Inheritance.
    >>
    >> Protocols which support creating files without specifying permissions
    >> can explicitly clear the RICHACL_PROTECTED flag after creating a file
    >> and reset the file masks to "undo" applying the create mode; see
    >> richacl_compute_max_masks(). They should set the RICHACL_DEFAULTED
    >> flag. This is a workaround; a mechanism that would allow a process to
    >> indicate to the kernel to ignore the create mode when there are
    >> inherited permissions would fix this problem.
    >
    > Also, as you know: current nfsd has no way to create files without
    > setting permissions. And if we were to implement that it's unclear how
    > many clients would actually use it (Windows clients are rare). And of
    > course Samba doesn't have the interfaces it would need.
    >
    > I think we should just drop this for now. The rest of the richacl stuff
    > is still useful without it.

    Samba will hack around it and adjust the ACL after the create; that's
    still better than not having Automatic Inheritance. Windows uses AI
    all the time so AI is more important for Samba than for NFSv4.

    Thanks,
    Andreas


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