As of r363471, tmpfs is included in all GENERIC kernel configs. This
results in a warning being emitted for each call to kldload(8):
module_register: cannot register tmpfs from tmpfs.ko; already loaded from kernel
Check for the presence of the module via kldstat first to quiet this
warning.
Reviewed by: asomers, arichardson
Differential Revision: https://reviews.freebsd.org/D26632
This code was originally written for NetBSD. r306031 tried to adapt it to
FreeBSD, but didn't correctly handle the case that tmpfs was available, but
not already loaded. Fix the logic to load the module if necessary. The
tmpfs tests shouldn't be skipped anymore.
Also, fix a comment that was dislocated by r306031.
Reported by: Jenkins
MFC after: 2 weeks
Use kldstat -m to determine whether or not a filesystem is loaded. This works
well with tmpfs, ufs, and zfs
MFC after: 1 month
Sponsored by: Dell EMC Isilon
minus the vendor Makefiles
Provide directions for how to bootstrap the vendor sources in
FREEBSD-upgrade
MFC after 2 weeks
Discussed with: rpaulo
Sponsored by: EMC / Isilon Storage Division
