update from margo

add lfs_sysctl and lfs_mount_type

daddr_t => ufs_daddr_t

break out reclaim operations (from mycroft)

merge ffs_root and lfs_root into ufs_root

4.4BSD snapshot (revision 8.1); add 1993 to copyright

Add calls to lfs_vref, lfs_vunref. More args to lfs_seglock.

Remove lfs_bmap and lfs_bmaparray calls (use ufs ones instead).

Add lfs_close to get rid of ITIMES modifying inode IMOD bit without
lfs knowing about it.

Add lfs_check and lfs_getattr; make lfs_newbuf visible for
lfs_syscalls.c

new parameters to fhtovp

restructure vnode walk and dirty block invalidation and discard; add
lock calls to single-thread segment writer

directory ops, unmount, minor cleanup; from Margo Seltzer

prototypes cleaned up after vn_if change

vnode interface conversion

FIFOOPS update for vn_if conversion

VOP_TRUNCATE now takes a cred argument

ensure proper types for local variables and parameters

remove the rest of the typedef's

move lfs_ifind into lfs_inode.c, it's only used in one place

add lfs_vflush; flush a vnode to disk

changes to make lfs_vget retrieve the IFILE inode like any other
inode

lfs_fhtovp takes an additional parameter

add lfs_balloc external declaration

inline lfs_iset in lfs_segment.c