Re: [PATCH V3 0/6] namespaces: log namespaces per task

On 14/05/22, Michael Kerrisk wrote: > Richard, Hi Michael, > On Tue, May 20, 2014 at 3:12 PM, Richard Guy Briggs <rgb(a)redhat.com&gt; wrote: > > The purpose is to track namespaces in use by logged processes from the > > perspective of init_*_ns. > > > > 1/6 defines a function to generate them and assigns them. > > > > Use a serial number per namespace (unique across one boot of one kernel) > > instead of the inode number (which is claimed to have had the right to change > > reserved and is not necessarily unique if there is more than one proc fs). It > > could be argued that the inode numbers have now become a defacto interface and > > can't change now, but I'm proposing this approach to see if this helps address > > some of the objections to the earlier patchset. > > > > 2/6 adds access functions to get to the serial numbers in a similar way to > > inode access for namespace proc operations. > > > > 3/6 implements, as suggested by Serge Hallyn, making these serial numbers > > available in /proc/self/ns/{ipc,mnt,net,pid,user,uts}_snum. I chose "snum" > > instead of "seq" for consistency with inum and there are a number of other uses > > of "seq" in the namespace code. > > > > 4/6 exposes proc's ns entries structure which lists a number of useful > > operations per namespace type for other subsystems to use. > > Since the 3 and 4 change the ABI, please CC iterations of this patch > series to linux-api(a)vger.kernel.org, as per Documentation/SubmitChecklist. Neither patch 3/6 nor 4/6 changes the syscall interface.

Patch 3/6 adds /proc/<pid>/ns/ entries, which looks more like #16 in that document (for which /proc/<pid>/ns/<nstype> was never added).