On Tue, 07 Aug 2007 20:45:34 -0400
Trond Myklebust <trond.myklebust@xxxxxxxxxx> wrote:
> > - rename something so that unconverted filesystems will reliably fail to
> > compile?
> >
> > - leave existing filesystems alone, but add a new
> > inode_operations.setattr_jeff, which the networked filesytems can
> > implement, and teach core vfs to call setattr_jeff in preference to
> > setattr?
>
> If you really need to know that the filesystem is handling the flags,
> then how about instead having ->setattr() return something which
> indicates which flags it actually handled? That is likely to be a far
> more intrusive change, but it is one which is future-proof.
>
One thing that we could do here is have notify_change check
attr->ia_valid after the setattr operation returns. If either ATTR_KILL_*
bit is set then BUG(). The helper function already clears those bits
so anything using it should automatically be ok. We'd have to fix
up NFS and a few others that don't implement suid/sgid.
This is not as certain as changing the name of the inode operation. It
would only pop when someone is attempting to change a setuid/setgid
file on these filesystems. Still, it should conceivably catch most if
not all offenders. Would that be sufficient to take care of everyone's
concerns?
--
Jeff Layton <jlayton@xxxxxxxxxx>
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