[GIT PULL] user namespace and namespace infrastructure changes for 3.8

[Andy Lutomirski]

On Thu, Dec 13, 2012 at 8:11 PM, Eric W. Biederman
<ebiederm at xmission.com> wrote:
> Andy Lutomirski <luto at amacapital.net> writes:
>
>> One more issue: the requirement that both upper and lower uids (etc.)
>> in the maps are in order is rather limiting.  I have no objection if
>> you only require upper ids to be monotonic, but currently there's no
>> way to may root outside to uid n (for n > 0) and some nonroot user
>> outside to uid 0.
>
> There is.  You may set up to 5 (extents).  You just have to use a second
> extent for the non-contiguous bits.  My reader is lazy and you have to
> set all of the extents with a single write, so you may have missed the
> ability to set more than one extent.
>

If I'm wrong, I'll happily eat my words.  Both:

0 1 1
1 0 1

and

1 0 1
0 1 1

are rejected, unless I totally messed up.

--Andy