Mark geom classes as deprecated.

[imp]

Summary

Mark geom classes as deprecated.

geom_bsd, geom_mbr and geom_sunlabel have been obsolete since Marcel
Moolenaar's geom_part was in FreeBSD 7. They haven't been in GENERIC
since FreeBSD 8. Add warning when used.

geom_vol_ffs has been obsolete since ufs support to geom_label was
ncommitted in FreeBSD 5. It hasn't been in GENERIC since FreeBSD 5.
Add warning when used.

geom_fox has been obsolete since gmultipath was committed in FreeBSD 7.
(no warning added, since this is a very obscure class).

These will all be removed in FreeBSD 12.

MFC After 3 days
Differential Revision https://reviews.freebsd.org/D11935

Note Classes will be removed after MFC

[jhibbits]

doIt!

[imp]

Mark more

[imp]

More

[bcr]

This comment was removed by bcr.

[imp]

Summary updated to be actual commit message with some ':' removed to keep Phab from crying over them.

[jhb]

Not sure if you could do a runtime warning for GEOM_FOX as well at least?

head/sys/geom/geom_mbr.c

321 ↗

(On Diff #31823)

FWIW, I would have been fine with whining each time rather than needing a 'once' flag.

[imp]

In D11935#247749, @jhb wrote:

Not sure if you could do a runtime warning for GEOM_FOX as well at least?

OK. I can do that.