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Date: Mon, 18 Sep 2000 13:23:36 -0400 (EDT)
From: Bosko Milekic <bmilekic@jehovah.technokratis.com>
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Subject: kern/21362: [PATCH] mbuf M_RDONLY flag: to be continued... 
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>Number:         21362
>Category:       kern
>Synopsis:       Adds M_RDONLY to external storage mbufs
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 18 10:30:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Bosko Milekic
>Release:        FreeBSD 5.0-CURRENT i386
>Organization:
N/A 
>Environment:

	FreeBSD 5.0-CURRENT

>Description:

	Here is a working pre-SMPng patch adding M_RDONLY flag and macro to
  mbufs that have an ext_buf attached. It is pre-SMPng and should probably
  just be left sitting here (with this PR) until we're finished threading
  this area of the code, and then merged, possibly modified, and committed,
  if deemed necessary. The diff can be found here:

	http://www.technokratis.com/code/mbuf/mbuf_rdonly.patch

	Idea for this is in part from dwmalone, in part to Ian Dowse. They
  should review/add to this before it's committed. Due to the SMPng delay,
  let it just sit for now.

	The M_RDONLY flag and the macro, by the way, allow for us to
  determine uniformally whether the external storage in question is
  safe to be tampered with/written to, or not. See code and list archives
  (-net, specifically) for details. 

>How-To-Repeat:

	Not applicable.

>Fix:

	Not applicable.


>Release-Note:
>Audit-Trail:
>Unformatted:


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