Re: Non-GPL export of invalidate_mmap_range

From: Daniel Phillips (phillips_at_arcor.de)
Date: 02/19/04

  • Next message: Andi Kleen: "Re: Intel x86-64 support patch breaks amd64" 
    To: Andrew Morton <akpm@osdl.org>, paulmck@us.ibm.com
Date:	Thu, 19 Feb 2004 15:56:49 -0500

    On Tuesday 17 February 2004 19:19, Andrew Morton wrote:
    > I don't see any licensing issues with the patch because the filesystem
    > which needs it clearly meets Linus's "this is not a derived work" criteria.
    >
    > And I don't see a technical problem with the export: given that we export
    > truncate_inode_pages() it makes sense to also export the corresponding
    > pagetable shootdown function.
    >
    > Yes, this is a sensitive issue. Can we please evaluate it strictly
    > according to technical and licensing considerations?
    >
    > Having said that, what concerns issues remain with Paul's patch?

    Hi Andrew,

    OpenGFS and Sistina GFS use zap_page_range directly, essentially doing the
    same as invalidate_mmap_range but skipping any vmas belonging to MAP_PRIVATE
    mmaps. This avoids destroying data on anon pages. GPFS and every other DFS
    have the same problem as far as I can see, and it isn't addressed by
    exporting invalidate_mmap_range as it stands. Paul?

    Regards,

    Daniel

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