Re: [PATCH 2/2] proc: Usable inode numbers for the namespace file descriptors.

"Serge E. Hallyn" [off-list ref] writes:

Quoting Eric W. Biederman (ebiederm@xmission.com):

quoted

Assign a unique proc inode to each namespace, yielding an
identifier that userspace can use for identifying a namespace.

This has been a long requested feature and only blocked because
a naive implementation would put the id in a global space and
would ultimately require having a namespace for the names of
namespaces, making migration and certain virtualization tricks
impossible.

We still don't have per superblock inode numbers for proc, which
appears necessary for application unaware checkpoint/restart and
migrations (if the application is using namespace filedescriptors)
but that is now allowd by the design if it becomes important.

I have preallocated the ipc and uts initial proc inode numbers so
their structures can be statically initialized.

Signed-off-by: Eric W. Biederman <redacted>

I've not looked at the setns patches enough, but from what I can see
here it looks good.

Acked-by: Serge Hallyn <serge@hallyn.com>

Thanks.

There are bugs in my existing proc bits that I am working on fixing so
this second patch will have a small update, before it gets merged.

But posting the patches I was looking for a little review and I was
announcing I had solved the technical problem of how we talk about
namespaces, without needing to introduce another namespace for
namespaces.

Eric