From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH] ext4: introduce per-inode DAX flag Date: Fri, 25 Aug 2017 08:40:32 -0700 Message-ID: <20170825154032.GA1827@infradead.org> References: <20170805084601.GA12425@infradead.org> <20170807121212.nuiho4afmdjf5vsd@rh_laptop> <20170808090016.lxfbcrhoybmyfvlc@rh_laptop> <20170811100147.GB7064@infradead.org> <20170811121132.bj5y77scrvkgy7uo@rh_laptop> <20170811125849.GA15300@infradead.org> <20170811134130.o46y5jpekrpj5qvw@rh_laptop> <20170824182057.amdirlrbugezrahy@thunk.org> <20170825075415.GA748@infradead.org> <20170825151445.ycf5xomoxvebgaez@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Christoph Hellwig , linux-ext4@vger.kernel.org, Lukas Czerner , linux-xfs@vger.kernel.org To: Theodore Ts'o Return-path: Received: from bombadil.infradead.org ([65.50.211.133]:47973 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933622AbdHYPkd (ORCPT ); Fri, 25 Aug 2017 11:40:33 -0400 Content-Disposition: inline In-Reply-To: <20170825151445.ycf5xomoxvebgaez@thunk.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri, Aug 25, 2017 at 11:14:45AM -0400, Theodore Ts'o wrote: > > I don't know of anyone that actually uses the flag. If someone did > > that would probably run into problems like changing that changing it > > on a file that's currently mmaped would crash an burn badly. > > Crash and burn meaning the *kernel* will crash and burn? Or will data > be damaged? > > Given that, maybe XFS should withdraw support for the DAX and hope no > one is actually using it? Nah, -o dax works very well. It's just the flag instead of the -o dax option or rather switching it on a mapped file will probably be very dangerous. > > - Ted > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ---end quoted text---