From owner-cvs-all  Mon Oct 21 18:14:58 2002
Delivered-To: cvs-all@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 239A737B404; Mon, 21 Oct 2002 18:14:57 -0700 (PDT)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id DDCC843E65; Mon, 21 Oct 2002 18:14:56 -0700 (PDT)
	(envelope-from mckusick@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.12.6/8.12.6) with ESMTP id g9M1EPmV050235;
	Mon, 21 Oct 2002 18:14:25 -0700 (PDT)
	(envelope-from mckusick@repoman.freebsd.org)
Received: (from mckusick@localhost)
	by repoman.freebsd.org (8.12.6/8.12.6/Submit) id g9M1EPJ0050234;
	Mon, 21 Oct 2002 18:14:25 -0700 (PDT)
Message-Id: <200210220114.g9M1EPJ0050234@repoman.freebsd.org>
From: Kirk McKusick <mckusick@FreeBSD.org>
Date: Mon, 21 Oct 2002 18:14:25 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/ufs/ffs ffs_balloc.c
X-FreeBSD-CVS-Branch: HEAD
Sender: owner-cvs-all@FreeBSD.ORG
Precedence: bulk
List-ID: <cvs-all.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20cvs-all>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20cvs-all>
X-Loop: FreeBSD.ORG

mckusick    2002/10/21 18:14:25 PDT

  Modified files:
    sys/ufs/ffs          ffs_balloc.c 
  Log:
  This update is a performance improvement when allocating blocks on
  a full filesystem. Previously, if the allocation failed, we had to
  fsync the file before rolling back any partial allocation of indirect
  blocks. Most block allocation requests only need to allocate a single
  data block and if that allocation fails, there is nothing to unroll.
  So, before doing the fsync, we check to see if any rollback will
  really be necessary. If none is necessary, then we simply return.
  This update eliminates the flurry of disk activity that got triggered
  whenever a filesystem would run out of space.
  
  Sponsored by:   DARPA & NAI Labs.
  
  Revision  Changes    Path
  1.39      +12 -0     src/sys/ufs/ffs/ffs_balloc.c

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe cvs-all" in the body of the message