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Message-ID: <20151025212247.GI19199@dastard> Date: Mon, 26 Oct 2015 08:22:47 +1100 From: Dave Chinner <david@...morbit.com> To: Jan Kara <jack@...e.cz> Cc: "Williams, Dan J" <dan.j.williams@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "jmoyer@...hat.com" <jmoyer@...hat.com>, "hch@....de" <hch@....de>, "axboe@...com" <axboe@...com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>, "willy@...ux.intel.com" <willy@...ux.intel.com>, "ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com> Subject: Re: [PATCH 5/5] block: enable dax for raw block devices On Thu, Oct 22, 2015 at 11:08:18PM +0200, Jan Kara wrote: > Ugh2: Now I realized that DAX mmap isn't safe wrt fs freezing even for > filesystems since there's nothing which writeprotects pages that are > writeably mapped. In normal path, page writeback does this but that doesn't > happen for DAX. I remember we once talked about this but it got lost. > We need something like walk all filesystem inodes during fs freeze and > writeprotect all pages that are mapped. But that's going to be slow... fsync() has the same problem - we have no record of the pages that need to be committed and then write protected when fsync() is called after write()... Cheers, Dave. -- Dave Chinner david@...morbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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