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    SubjectRe: [PATCH 07/25] r/o bind mounts: elevate write count for some ioctls
    On Thu, 20 Sep 2007 12:52:57 -0700 Dave Hansen <haveblue@us.ibm.com> wrote:

    > + ret = mnt_want_write(filp->f_vfsmnt);

    It still creeps me out that we have this sprinkled *all over* the tree and
    people will forget to do it and there's no runtime or compile-time checking
    that they remembered to do it and when they forget to do it nobody will
    notice that it broke until ages and ages later.

    IOW: it is a sheer horror for maintainability.


    Please have a think about what we can do about this. For example, if you'd
    thought about this up-front, (and I think it's a big problem), we could
    have done something grotty like, in mnt_want_write():

    current->vfsmnt_im_allowed_to_write_to = inode;

    and then check that current->vfsmnt_im_allowed_to_write_to is the correct
    inode in __mark_inode_dirty() and various other strategic places. That
    sort of thing.


    We need to do *something*, I think. This code just doesn't look feasibly
    maintainable to me.

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