expand vput inline so that locking is managed properly

allow simple lock failure to be a warning rather than a panic

convert VOP_LOCK to vn_lock; add parameters to VOP_UNLOCK

massive overhaul to use new lock manager;
add vrecycle and vop_nolock* functions

add vn_lock function; convert VOP_LOCK to vn_lock; add parameters to VOP_UNLOCK

get proc pointer rather than pid; more checking for DRAINING errors

vop_inactive is called with locked vnode;
vop_inactive and vop_reclaim get proc pointer

vclean is static to vfs_subr.c

involve the preprocessor so that incorrect argument counts are detected

minor cleanups; non-inline version of simple locking functions for NCPUS == 1

add vfs_mountroot and vfs_rootmountalloc functions;
bdevvp always indicates when it fails

add mountroot functions to vfsconf; no longer make FFS default for root

replace mountroot with function vfs_mountroot

don't call VFS_SYNC for read-only filesystems

VOP_REVOKE(vp, 0) should really be vgone(vp)

set MNT_ROOTFS immediately after doing mountroot rather than in filesystems

disallow unmount of root fs

change mountlist to CIRCLEQ so we can do unmountall (from mycroft)

If the buffer is full, keep the most recent data. (from ralph)

fix bug pointed out by Stevens in his vol II book

missing second parameter to closef (from Poul-Henning Kamp)

silently accept multiple instances of the same address in vfs_hang_addrlist

cleanups of init argument setup (from mycroft)

limit process to 327.67 rather than 227 seconds timeout;
return correct timeout from getsockopt (from rstevens@noao.edu)

move relookup in from ufs_vnops.c