Date: Tue, 20 Jul 1999 12:52:50 -0700 From: John Milford <jwm@CSUA.Berkeley.EDU> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: "David E. Cross" <crossd@cs.rpi.edu>, freebsd-hackers@FreeBSD.ORG Subject: Re: USFS (User Space File System) Message-ID: <199907201952.MAA14190@soda.CSUA.Berkeley.EDU> In-Reply-To: Message from Matthew Dillon <dillon@apollo.backplane.com> of "Tue, 20 Jul 1999 11:30:09 PDT." <199907201830.LAA06200@apollo.backplane.com>
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Matthew Dillon <dillon@apollo.backplane.com> wrote: > > This seems like an unnecessary complication to me. It would be > easier to simply make it a device that you can open(), read(), and > write() as I first suggested. > > MFS is not a good template for any of this. MFS is very, very simple > and the pieces that would make a user-level device driver work are > considerably more complex because they require the ability to make > information available to a user process that is usually available only > to the kernel. MFS makes no progress to this end, because MFS runs > (more or less permanently) in supervisor mode. > > -Matt I'll defer to you on this as I never got far enough into this project to have discovered all the complications. --John To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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