only mark root clean when it is mounted read-only

check and act on the clean flag

add function prototypes

daddr_t => ufs_daddr_t

match rev 8.6 of /sys/sys/mount.h from Mike Hibler
reorganization for generic support of export information

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

rename devname to cdevname, devname(3) now in the C library

canonicalize disk name when running manually;
remount root filesystem after changes are made to avoid reboot

-c now takes a level; write out all superblocks after a conversion

add <sys/time.h> for dinode.h

update from Ralph Campbell to eliminate floating point

break FFS into UFS/FFS/LFS

keep the data structures consistent

fix QUIT processing for preen (was broken when preen.c split out)

lint (from Torek)

lint

new copyright notice

string.h is ANSI C include file

use getopt; do not check for root filesystem when given a list of devices

break out overlapped disk processing to preen.c (for use in quotacheck)

check character device root, not the block device

do not try to fsck non-ufs filesystems (from borman@cray.com)

save block pointers of directories as they are encountered in pass1
so that they do not have to be reread when descending in pass2

convert to BSD only copyright

lint and other aesthetic cleanups