Andrey Vagin <avagin@xxxxxxxxxx> writes: > Hello, > > I forgot to add --cc-cover for git send-email, so everyone who is in > Cc got only a cover letter. All messages were sent in mail lists. > > Sorry for inconvenience. Mostly the code looked sensible. But I had a couple of issues. Resend this in September (when the merge window is closed and I am back from vacation) and I will give this a thorough review and get this merged. Or possibly next week if Linus releases another -rc > On Thu, Jul 14, 2016 at 11:20 AM, Andrey Vagin <avagin@xxxxxxxxxx> wrote: >> Each namespace has an owning user namespace and now there is not way >> to discover these relationships. >> >> Pid and user namepaces are hierarchical. There is no way to discover >> parent-child relationships too. >> >> Why we may want to know relationships between namespaces? >> >> One use would be visualization, in order to understand the running system. >> Another would be to answer the question: what capability does process X have to >> perform operations on a resource governed by namespace Y? >> >> One more use-case (which usually called abnormal) is checkpoint/restart. >> In CRIU we age going to dump and restore nested namespaces. >> >> There [1] was a discussion about which interface to choose to determing >> relationships between namespaces. >> >> Eric suggested to add two ioctl-s [2]: >>> Grumble, Grumble. I think this may actually a case for creating ioctls >>> for these two cases. Now that random nsfs file descriptors are bind >>> mountable the original reason for using proc files is not as pressing. >>> >>> One ioctl for the user namespace that owns a file descriptor. >>> One ioctl for the parent namespace of a namespace file descriptor. >> >> Here is an implementaions of these ioctl-s. >> >> [1] https://lkml.org/lkml/2016/7/6/158 >> [2] https://lkml.org/lkml/2016/7/9/101 >> >> Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> >> Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> >> Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx> >> Cc: "W. Trevor King" <wking@xxxxxxxxxx> >> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> >> Cc: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx> Eric -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
