Set segment summary magic numbers and add support for fragments.

new dinode format

prettiness police; From: Charles Hannum <mycroft@NetBSD.ORG>

add lfs_maxsymlinklen (from mycroft)

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

2^31 doesn't work in C

Add lock pid to lfs structure.

Use union for inode number. Compute disk blocks per seg correctly.

Initialize dsize in terms of number of segments (i.e. don't count
extra space that doesn't live in any segment).

Add available space accounting, so that the cleaner can be woken
up explicitly when we need space and so we can return ENOSPC accurately.

Initialize empty segment "nsum" field to 0 so that bytes don't go
negative as soon as you reclaim the segment.

fix checksum

rip out unnecessary includes

Add number of segment summary blocks and number of inodes to segment
usage table. Since SEGUSE is now power of 2, allow fast arithmetic. Change
block accounting to use sectors rather than file sy

Add number of segment summary blocks and number of inodes to segment
usage table. Since SEGUSE is now power of 2, allow fast arithmetic. Change
block accounting to use sectors rather than file system blocks.

show more ...

Write an empty summary block after the first complete partial

block sizes in inodes (dinodes too) are measured in disk blocks not file system
blocks. Fix make_dinode to perform this calculation.

add lfs_maxfilesize in the superblock

struct direct now contains a type; times are now quad

DIRSIZ now takes two args

add lfs_seglock, delete lfs_segtab, lfs_seglist

add directory ops

typo

needs moutn.h

delete if_st_atime

nbytes shouldn't include superblocks or summary blocks