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Date: Wed, 19 Apr 1995 21:02:45 -0700
From: Julian Elischer <julian>
Message-Id: <199504200402.VAA13928@freefall.cdrom.com>
To: CVS-commiters, cvs-sys
Subject: cvs commit: src/sys/miscfs/devfs devfs.doc
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julian      95/04/19 21:02:45

  Modified:    sys/miscfs/devfs  devfs.doc
  Log:
  Submitted by:	julian
  NOTES FOR RELEASE 1
  1/	this is very preliminary
  	It's been included so that people can start to play with it.
  	(and fix bugs?)
  2/	Attempts to unmount a devfs structure while you are 'IN' in will
  	result in a message "hanging vnode" and the system will panic.
  3/	'find /devfs -print'
  	will only find the directories, and the devices don't show up.. (?)
  	'find /devfs -ls'
  	DOES show all the devices. (!?)
  4/	the dates of all nodes is '0' i.e. 00:00 1st Jan 1970 UTC.
  	It appears 'time' in the kernel hasn't been started at the time that
  	the devfs is started up. (when the first device registers itself).
  	notably, the VFS hasn't been started yet either so the devfs
  	has to be careful
  	to not use VFS features during probe time.
  5/	many features are not present yet..
  	e.g. symlinks, a comprehensive registration interface
  	(only a crude one)
  	ability to unlink and mv nodes.
  6/	I'm pretty sure my use of vnodes is bad and it may be 'losing'
  	them, or alternatively, corrupting things.. I need a vnode specialist
  	to look at this.
  7/	The back and front node structures have become very similar with time
  	and I have decided to merge them to a single structure,
  	which will be called a "devname" struct, as they can be thought of
  	as the analogue of a directory entry, except that they are linked
  	rather than in an array. (the "devnode" structs can be thought of
  	as inodes)