Miklos Szeredi wrote:
> > Actually, in terms of complexity, it's not much different from using
> > bind mounts.
>
> As has been suggested by Pavel, bind mounting foreign namespaces could
> just be done with a new bind_fd(fd, path) syscall and file descriptor
> passing with SCM_RIGHTS.
Yes, he's right.
But you don't need a new system call to bind an fd.
"mount --bind /proc/self/fd/N mount_point" works, try it.
> That sounds to me orders of magnitude less complex (on the kernel side
> at least) than sb sharing.
In terms of what happens in the kernel, they're almost exactly the
same: either way, a super block ends up shared by two mounts. That's
what I meant.
I agree that in terms of what userspace has to do, if just binding
works that's simpler. And it does seem to work with the above mount
command.
-- Jamie
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