'RELENG_3_0_0_RELEASE'.

This commit was manufactured to restore the state of the 3.0-RELEASE image.
Releases prior to 5.3-RELEASE are omitting the secure/ and crypto/ subdirs.

'RELENG_3_0_0_RELEASE'.

Change from lkm to kld

Add field plexsdno to sd struct

Add flag VF_NEWBORN to drive, sd, plex and volume structs, indicating
that the object has just been created.

Add object types for raw (unattached) plexes and subdisks

Remove definitions of VOLNO, PLEXNO and SDNO (now functions Volno,
Plexno and Sdno)

Move revive parameters from struct plex to struct sd.

struct plex:
  maintain a count of the number of inaccessible subdisks.
  remove defective and unmapped regions.

Debug flags: make an enum (previously #define)

Set default revive block size to 64kB (was 32 kB)

  Previously, accidentally starting the wrong version could corrupt
  the RAID5 configuration.

  Add functions Volno, Plexno and Sdno to replace the old defines
  VOLNO, PLEXNO and SDNO.

  plex_reviving (now we revive subdisks)
  drive_coming_up (never happened)

Add state sd_reviving.

Change from lkm to kld

Serious rewrite.  No longer call set_<foo>_state to set the state
based only on other objects; instead, add functions
update_<foo>_state, which determine what the state should be by
themselves.  This allows the set_<foo>_state functions to shrink
enough to be almost intelligible.

Remove flags setstate_recurse and setstate_recursing.

Remove plex defective regions and unmapped regions, which were
maintained but not used.

Change code to allow daemon to perform operations formerly kludged
into an interrupt context.  Remove the DIRTYCONFIG kludge.

makes it easier to keep track of which parts of a plex need reviving.

Use sdio, not vinumstrategy, to write to the subdisk.

Change from lkm to kld

Remove #ifdefs for FreeBSD 2.c

vinumstrategy:
  Support anonymous (`raw') subdisks and plexes.
  Change code to allow daemon to perform operations formerly kludged
  into an interrupt context.  Remove the DIRTYCONFIG kludge.

No longer set B_ORDERED for reviving subdisks.  I suspect this
wouldn't work correctly, and it should be done in a different manner
in vinumrevive.c

sdio: set subdisk state correctly on error
      start to remove code that doesn't make any sense any more.