From owner-cvs-all  Fri Oct  8 12:19:37 1999
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Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/vm vm_swap.c 
In-reply-to: Your message of "Fri, 08 Oct 1999 12:10:19 PDT."
             <199910081910.MAA18645@freefall.freebsd.org> 
Date: Fri, 08 Oct 1999 21:18:58 +0200
Message-ID: <4944.939410338@critter.freebsd.dk>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
Sender: owner-cvs-all@FreeBSD.ORG
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In message <199910081910.MAA18645@freefall.freebsd.org>, Poul-Henning Kamp writ
es:
>phk         1999/10/08 12:10:19 PDT
>
>  Modified files:
>    sys/vm               vm_swap.c 
>  Log:
>  Fix a panic(8) implementation:
>  	hexdump -C < /dev/drum
>  by simply refusing to do I/O from userland.
>  a panic.  I'm not sure we even need /dev/drum anymore, it seems
>  to have been broken for a long time thi

My vi caved in on me, here is the ungarbeled version:

  Fix a panic(8) implementation:
  	hexdump -C < /dev/drum
  by simply refusing to do I/O from userland.

  Substitute noread and nowrite for physread and physwrite, and
  make two dev_t's, one with minor zero which can be opened from
  userland but not sent throug strategt, and one with minor one
  which is used for swapvp.

  It is not clear to me what purpose userland access to the "drum"
  device serve these days.  I can see that libkvm opens the drum,
  but considering that this bug have existed for around to 9 months,
  I gather that it never actually does any reads or writes to
  /dev/drum.

  Unless somebody else beats me to it or explains why we need to
  keep it, /dev/drum is now scheduled for demolition.

--
Poul-Henning Kamp             FreeBSD coreteam member
phk@FreeBSD.ORG               "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!


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