From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 16 Mar 1999 11:38:33 -0500
From: jmk@plan9.bell-labs.com jmk@plan9.bell-labs.com
Subject: [9fans] Re: M device?
Topicbox-Message-UUID: 935bf6d0-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19990316163833.J4bgl9t03LBxNslK1gYC3wBLQsHLqZ787Vgp8L4pS9o@z>

	Trivial question, but I can't find the answer anywhere I'd expect to see
	it; what's the M device?  It comes up in an ls -l listing of my root
	directory (single machine, 386, standard install from the Plan 9 CDROM).

	d-rwxrwxr-x M 3 sys sys     0 Jun 22  1997 /3210
	d-rwxrwxr-x M 3 sys sys     0 Jun 22  1997 /386
	d-rwxrwxr-x M 3 sys sys     0 Jun 22  1997 /68020
	d-rwxrwxr-x M 3 sys sys     0 Jun 22  1997 /960
	--r--r--r-- M 3 sys sys 63707 Apr  5  1995 /_conform.map
	d-rwxrwxr-x M 3 sys sys     0 Jun 22  1997 /acme
	d-rwxrwxrwx M 3 adm adm     0 Jun 22  1997 /adm
	d-rwxrwxrwx / 0 cwr cwr     0 Apr  4  1995 /bin
	d-rwxrwxr-x M 3 sys sys     0 Apr  5  1995 /bin
	--r-xr-xr-x / 0 cwr cwr 34080 Apr  4  1995 /boot
	--r-xr-xr-x / 0 cwr cwr 38432 Apr  4  1995 /cfs

	etc.

	The sys-owned stuff is the ordinary root fs, so M must be some sort
	of server, but I can't find the relevant letter in man(3).


	Will
	cwr@crash.cts.com

Brazil has the '#c/drivers' file to make finding out which drivers are loaded
with the kernel a bit easier. The devtab table changed from being an array of
Dev to an array of pointers to Dev and Dev acquired a couple of new elements to
describe the entry; devchar went away.

	% tail -20 /sys/src/brazil/port/devmnt.c
	Dev mntdevtab = {
		'M',
		"mnt",

		mntreset,
		devinit,
		mntattach,
		mntclone,
		mntwalk,
		mntstat,
		mntopen,
		mntcreate,
		mntclose,
		mntread,
		devbread,
		mntwrite,
		devbwrite,
		mntremove,
		mntwstat,
	};
	% cat /dev/drivers
	#/ root
	#c cons
	#e env
	#| pipe
	#p proc
	#M mnt
	#s srv
	#d dup
	#r rtc
	#D ssl
	#z mntstats
	#l ether
	#I ip
	#i draw
	#m mouse
	#v vga
	#S scsi
	#W cd
	#w sd
	#H ata
	#f floppy
	#A audio
	#y i82365
	#L lpt
	#t ns16552
	%