From owner-svn-src-head@FreeBSD.ORG  Fri May  3 17:20:19 2013
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by hub.freebsd.org (Postfix) with ESMTP id 813C7493;
 Fri,  3 May 2013 17:20:19 +0000 (UTC) (envelope-from jhb@freebsd.org)
Received: from bigwig.baldwin.cx (bigwig.baldwin.cx [IPv6:2001:470:1f11:75::1])
 by mx1.freebsd.org (Postfix) with ESMTP id 5F99C12D1;
 Fri,  3 May 2013 17:20:19 +0000 (UTC)
Received: from jhbbsd.localnet (unknown [209.249.190.124])
 by bigwig.baldwin.cx (Postfix) with ESMTPSA id ACE7AB990;
 Fri,  3 May 2013 13:20:18 -0400 (EDT)
From: John Baldwin <jhb@freebsd.org>
To: Konstantin Belousov <kib@freebsd.org>
Subject: Re: svn commit: r250193 - head/sys/fs/msdosfs
Date: Fri, 3 May 2013 11:55:47 -0400
User-Agent: KMail/1.13.5 (FreeBSD/8.2-CBSD-20110714-p25; KDE/4.5.5; amd64; ; )
References: <201305022000.r42K0Bdk098965@svn.freebsd.org>
In-Reply-To: <201305022000.r42K0Bdk098965@svn.freebsd.org>
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="utf-8"
Content-Transfer-Encoding: 7bit
Message-Id: <201305031155.47559.jhb@freebsd.org>
X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.7
 (bigwig.baldwin.cx); Fri, 03 May 2013 13:20:18 -0400 (EDT)
Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 src-committers@freebsd.org
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 03 May 2013 17:20:19 -0000

On Thursday, May 02, 2013 4:00:11 pm Konstantin Belousov wrote:
> Author: kib
> Date: Thu May  2 20:00:11 2013
> New Revision: 250193
> URL: http://svnweb.freebsd.org/changeset/base/250193
> 
> Log:
>   The fsync(2) call should sync the vnode in such way that even after
>   system crash which happen after successfull fsync() return, the data
>   is accessible.  For msdosfs, this means that FAT entries for the file
>   must be written.
>   
>   Since we do not track the FAT blocks containing entries for the
>   current file, just do a sloppy sync of the devvp vnode for the mount,
>   which buffers, among other things, contain FAT blocks.
>   
>   Simultaneously, for deupdat():
>   - optimize by clearing the modified flags before short-circuiting a
>     return, if the mount is read-only;
>   - only ignore the rest of the function for denode with DE_MODIFIED
>     flag clear when the waitfor argument is false.  The directory buffer
>     for the entry might be of delayed write;
>   - microoptimize by comparing the updated directory entry with the
>     current block content;
>   - try to cluster the write, fall back to bawrite() if low on
>     resources.
>   
>   Based on the submission by:	bde
>   MFC after:	2 weeks

Does this fix kern/62762?

-- 
John Baldwin