Messages in this thread | | | From | (Eric W. Biederman) | Subject | Re: [PATCH -mm 5/7] add user namespace | Date | Sat, 15 Jul 2006 17:29:25 -0600 |
| |
Trond Myklebust <trond.myklebust@fys.uio.no> writes:
> On Sat, 2006-07-15 at 06:35 -0600, Eric W. Biederman wrote: >> I hope the confusion has passed for Trond. My impression was he >> figured this was per process data so it didn't make sense any where >> near a filesystem, and the superblock was the last place it should >> be. > > You are still using the wrong abstraction. Data that is not global to > the entire machine has absolutely _no_ place being put into the > superblock. It doesn't matter if it is process-specific, > container-specific or whatever-else-specific, it will still be vetoed.
Sure, I have no problem with only global data, and filesystem specific data being in a super block. In this case my impression is that the data is at least arguably filesystem specific. filesystem-specific data is ok on the super block is it not?
> If your real problem is uid/gid mapping on top of generic filesystems, > then have you looked into the *BSD solution of using a stackable > filesystem (i.e. umapfs)?
I haven't and it sounds reasonable to look at. As far as I know BSDs don't have my specific problem. uid mapping is simply a tool for dealing with the problem, not the problem itself. A stackable filesystem is a reasonable alternative to using security keys to do the mapping.
My real problem is that there is a good case for uids that are not global to a machine. The discussion is simply how do you cope with that.
Now I do believe that there is a good case for uids being global to a filesystem and all I was really talking about was a tag that marked which parts of the entire system that used the same uids as the filesystem.
Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |