kern/52738: rumpfs does not support mtime

[martin%NetBSD.org@localhost]

>Number:         52738
>Category:       kern
>Synopsis:       rumpfs does not support mtime
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 19 21:00:00 +0000 2017
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.6
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-owl.duskware.de 8.99.6 NetBSD 8.99.6 (NIGHT-OWL) #555: Tue Nov 14 10:04:20 CET 2017 martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL amd64
Architecture: x86_64
Machine: amd64
>Description:

While trying to fix PR kern/51762 I noticed that rumpfs never updates the
mtime of anything. The only time a time stamp is set is during setattr VOP
calls setting one of the time stamps externaly, and during initial vnode
creation in makeprivate().

>How-To-Repeat:

Write something on rumpfs, check stat(2) values of mtime before and after.
ATF test program will be added ASAP.

>Fix:
n/a