port/dev.c		1990/0227		Created.
		1990/0303
		1990/0329
		1990/0821
		1990/11211
		1991/0318		Eliminate memcpy.
		1991/0411		Add devclwalk.
		1991/0414		Bug fix: close nc if walk errors out.
		1991/0421		Copy nc->aux in devclone. Bug fix confusion: now walk is returning on error.
		1991/0427		Copy mountid in devclone. Remove devclwalk entirely.
		1991/0626		Debugging: print when gen is broken, instead of panicking.
		1991/1109		Add user to devdir parameters.
		1991/1112		Performance: replace memmove with strncpy. Compute access modes for permission.
		1991/1120		Debugging: print more info about broken gen functions.
		1991/1206		Comment edit.
		1991/1220		Add kerndate.
		1992/0111		Move error.h to ../port. Change errors to actual strings.
		1992/0321		Move lib.h to ../port. XXX get copies of old lib.h
		1992/0520		Silence compiler warning.
		1992/0619		Remove "fcall.h".
		1992/0711		Silence compiler warning.
		1992/1217		Change: devchar is now a Rune string
		1993/0321		Format edit.
		1993/0323		Add CHMOUNT bit to mounted channels.
		1993/0330		Confusion over whether braces should stay. Use mode 775 not 700 for device directories.
		1993/0501		Convert to Brazil: add Path, up, format edits.
		1993/0525		Directory mode from 0700 to 0555.
		1993/0725		Remove comment — no longer true.
		1993/1013		Copy mcp in devclone.
		1993/1210		Change strncpy back to memmove.
		1995/0108		Add devbread, devbwrite.
		1995/0804		Remove compiler silencing.
		1995/0811		#undef DEVTAB.
		1996/0223		Remove "devtab.h". XXX make sure have devtab.h
		1997/0327		Add devreset, devinit, devcreate. Format edits. Devtab is now an array of pointers not structures.
		1997/0408		Devtab is now an array of pointers not structures.
		1998/0319		Botch involving lengths.
		1998/0326		Use length properly.
		1998/0512		Whitespace edit.
		1998/0829		Remove Chan.mnt; copy mh in devclone.
		1999/0122		Drop eqqid (it will be back).
		1999/0629		Drop Paths in favor of Cnames.
		1999/0630		Bug fix?: do not free c->name, do not incref.
		1999/0710		Bug fix: avoid empty name.
		1999/0724		Bug fix: = but meant ==.
		1999/1230		Add DEVDOTDOT to handle .. in devgen.
		2000/0716		Bug fix: use 0 as length.
		2000/0718		Add devpermcheck, for use by other drivers.
		2000/0817		Bug fix: do not leak bp on error in devbwrite.
		2001/0527		Convert to 9P2000. XXX.
		2001/0819		Remove debugging print. Remove Chan.mchan.
		2001/0820		Remove QTMOUNT bit.
		2001/0822		Bug fix?: save offset for devdirread to handle reads of large direectories.
		2001/0904		Put QTMOUNT back.
		2001/0905		Add devpower, devconfig.
		2001/0924		Use kstrcpy.
		2002/0104		Be more lax about QTDIR during walk. Why? XXX
		2002/0109		Add devshutdown.
		2002/0925		Error on short reads (cannot return anything useful; bug fix?)
		2002/1222		Add comment explaining use of devgen. Add devdebug.
		2003/0108		Remove devdebug.
		2003/0325		Performance: speed up devgen — allow searches for name.
		2003/0329		Debugging: check for broken devgens.