Messages in this thread | | | Date | Tue, 15 May 2001 16:41:09 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: LANANA: To Pending Device Number Registrants |
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On Tue, 15 May 2001, H. Peter Anvin wrote:
> Permission management. The permissions on the subnodes are inherited > from the main node, which is stored on a persistent medium.
If you want them all to inherit it - inherit from mountpoint. End of story. Yes, it means that permission(9) will need vfsmount argument. But we _will_ need that anyway. For per-mountpoint read-only, if nothing else.
Want details? Please. We have the ->getattr() method. Currently not used, but intended to be used by ...stat family (with the current behaviour being default). Now, let's pass to permission(9), notify_change(9) and ->{set,get}attr() both vfsmount and dentry. See what I mean?
We get (essentially for free) * per-mountpoint read-only flag (I've already done nosuid, noexec and nodev per-mountpoint) * ability to have inodes that simply don't have owners - ownership is determined (and handled) by the functions/methods above. So FAT and friends can get rid of knowledge of uid=,gid=" crap. * ability to inherit ownership from mountpoint and if fs wants it - update the ownership of mountpoint.
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