> > Yes, possibility for finding out where subfilesystems are located
> > _will_ be missing for such filesystems as sshfs.
>
> Why? Can't lookup() notice the change in remote st_dev as you cross the
> filesystem boundary?
a) sftp is path based protocol, there's no separate lookup
b) sftp doesn't transfer st_ino or st_dev, they are both made up on
the client side
> For NFS the plan is to automatically submount such remote
> subfilesystems. That fixes a host of problems including the one that you
> mention w.r.t. statfs, the problem of potential duplicate inode numbers,
> etc.
That is fine. It's clearly a superior sulution when the info is
available. With sshfs the server simply doesn't care about mounts,
and so this is basically out of the question.
Miklos
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