From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J. Bruce Fields" Subject: Re: [Lsf10-pc] [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tag on ext2 write) Date: Thu, 3 Jun 2010 12:30:01 -0400 Message-ID: <20100603163001.GF24994@fieldses.org> References: <20100531112817.GA16260@schmichrtp.mainz.de.ibm.com> <4C07D3D0.8010500@panasas.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <4C07D3D0.8010500@panasas.com> Sender: linux-kernel-owner@vger.kernel.org To: Boaz Harrosh Cc: Christof Schmitt , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, lsf10-pc@lists.linuxfoundation.org, Nick Piggin , Al Viro , Chris Mason , James Bottomley , "Martin K. Petersen" , Ric Wheeler , Matthew Wilcox , Vladislav Bolkhovitin , Christoph Hellwig List-Id: linux-scsi@vger.kernel.org On Thu, Jun 03, 2010 at 07:09:52PM +0300, Boaz Harrosh wrote: > [Topic] > How to not let pages change while in IO > > [Abstract] > As seen in a long thread on the fsdvel scsi mailing lists. Lots of > people have headaches and sleep less nights because individual pages > can change while in IO and/or DMA. Though each one as slightly different > needs, the mechanics look to be the same. > > People that care: > - Mirror and RAID people that need on disk consistency. > - Network storage that wants data checksum. Yes, nfs/rpcsec_gss code is an example of code that tries to sign pages containing data that could change underneath us. I don't know if we've seen it in practice. --b. > - DIF/DIX people > - ... > > I for one know nothing of the subject but am a RAID person and would > like a solution that does not force me to copy the complete data load. > > Please lets get all the VM VFS and drivers people in one room and see > if we can have a Linux solution to this problem > > Boaz > _______________________________________________ > Lsf10-pc mailing list > Lsf10-pc@lists.linux-foundation.org > https://lists.linux-foundation.org/mailman/listinfo/lsf10-pc