From owner-cvs-src@FreeBSD.ORG  Mon Sep 18 13:23:09 2006
Return-Path: <owner-cvs-src@FreeBSD.ORG>
X-Original-To: cvs-src@FreeBSD.org
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 58B4E16A40F;
	Mon, 18 Sep 2006 13:23:09 +0000 (UTC) (envelope-from kib@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id CD87143D6E;
	Mon, 18 Sep 2006 13:23:08 +0000 (GMT) (envelope-from kib@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.6/8.13.6) with ESMTP id k8IDN8pV097671;
	Mon, 18 Sep 2006 13:23:08 GMT (envelope-from kib@repoman.freebsd.org)
Received: (from kib@localhost)
	by repoman.freebsd.org (8.13.6/8.13.4/Submit) id k8IDN8je097670;
	Mon, 18 Sep 2006 13:23:08 GMT (envelope-from kib)
Message-Id: <200609181323.k8IDN8je097670@repoman.freebsd.org>
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 18 Sep 2006 13:23:08 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Cc: 
Subject: cvs commit: src/sys/fs/devfs devfs.h devfs_devs.c devfs_vfsops.c
 devfs_vnops.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 18 Sep 2006 13:23:09 -0000

kib         2006-09-18 13:23:08 UTC

  FreeBSD src repository

  Modified files:
    sys/fs/devfs         devfs.h devfs_devs.c devfs_vfsops.c 
                         devfs_vnops.c 
  Log:
  Resolve the devfs deadlock caused by LOR between devfs_mount->dm_lock and
  vnode lock in devfs_allocv. Do this by temporary dropping dm_lock around
  vnode locking.
  
  For safe operation, add hold counters for both devfs_mount and devfs_dirent,
  and DE_DOOMED flag for devfs_dirent. The facilities allow to continue after
  dropping of the dm_lock, by making sure that referenced memory does not
  disappear.
  
  Reviewed by:    tegge
  Tested by:      kris
  Approved by:    kan (mentor)
  PR:             kern/102335
  
  Revision  Changes    Path
  1.30      +11 -0     src/sys/fs/devfs/devfs.h
  1.47      +12 -1     src/sys/fs/devfs/devfs_devs.c
  1.51      +20 -4     src/sys/fs/devfs/devfs_vfsops.c
  1.134     +70 -11    src/sys/fs/devfs/devfs_vnops.c