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From: Linda Dunaphant <linda.dunaphant@ccur.com>
To: trond.myklebust@fys.uio.no
Cc: linux-kernel@vger.kernel.org
Subject: NFS: msync required for data writes to server?
Date: Thu, 12 May 2005 15:21:26 -0400	[thread overview]
Message-ID: <1115925686.6319.3.camel@lindad> (raw)

Hi Trond,

On our 2.6.9 based systems, data written using mmap(MAP_SHARED) on a NFS
client is *never* being pushed out to the server if an explicit msync call
is not issued before the munmap.

On 11/12/04, there was a message thread concerning NFS corruption when
using mmap/munmap:

http://marc.theaimsgroup.com/?l=linux-nfs&m=110028817508318&w=2

In this thread you stated:

     mmap() offers absolutely NO guarantees that the file will be synced to
     disk on close. Use msync(MS_SYNC) if you want such a guarantee.

Are you saying that the data will *never* be written to the server?  Could
you please clarify your position on this further? 

Thanks!
Linda



             reply	other threads:[~2005-05-12 19:21 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-05-12 19:21 Linda Dunaphant [this message]
2005-05-13  0:57 ` NFS: msync required for data writes to server? Andrew Morton
2005-05-13  2:21   ` Linda Dunaphant
2005-05-13  2:42     ` Andrew Morton
2005-05-13  3:41       ` Linda Dunaphant
2005-05-13  3:48       ` Trond Myklebust
2005-05-13 23:57         ` Linda Dunaphant

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