K 10
svn:author
V 5
joerg
K 8
svn:date
V 27
2003-01-07T11:56:53.000000Z
K 7
svn:log
V 1434
When parsing the name of the root device, do not assume all the world
is a Va^W^W^W^W everything before a slash must be _PATH_DEV.  Instead,
verify this assumption, and only skip "/dev/" if it is known to be
there.  Also, slightly defer the complaint about a "missing unit
number" in order to allow drivers to pre-allocate the variable
"rootdev", and return this one if the major number of the parsed
driver matches the major number of this pre-allocated rootdev.

This will allow volume managers to pre-allocate rootdev with something
they obtained knowledge through other ways, so the root file system
can be located e. g. on a vinum volume.

This is arguably more a hack than any clean solution, but a clean
solution is simply impossible on RELENG_4 without a major code reorg
(which is nothing we'd like to have now).  A solution for -current
needs to be completely different and can probably be a lot cleaner
(i. e. each driver could/should be allowed to parse the given string
for a root device name), but i more urgently needed this feature on
-stable by now for production machines.  Thus the method has been
chosen that has the least impact and risk of introducing new bugs.
(What doesn't work: since mountroot() cannot really parse the name
given, boot -a cannot translate e. g. ufs:/dev/vinum/root into a valid
device, but it can still parse ufs:/dev/da0a etc. to provide a
fallback for error recovery.)

Reviewed by:	grog

END