From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f42.google.com (mail-wm0-f42.google.com [74.125.82.42]) by kanga.kvack.org (Postfix) with ESMTP id 7A90C6B025E for ; Wed, 30 Mar 2016 03:48:58 -0400 (EDT) Received: by mail-wm0-f42.google.com with SMTP id r72so87173197wmg.0 for ; Wed, 30 Mar 2016 00:48:58 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id v19si3455754wjq.20.2016.03.30.00.48.57 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 30 Mar 2016 00:48:57 -0700 (PDT) Date: Wed, 30 Mar 2016 09:49:26 +0200 From: Jan Kara Subject: Re: [PATCH 4/5] dax: use sb_issue_zerout instead of calling dax_clear_sectors Message-ID: <20160330074926.GC12776@quack.suse.cz> References: <1458861450-17705-1-git-send-email-vishal.l.verma@intel.com> <1458861450-17705-5-git-send-email-vishal.l.verma@intel.com> <1458939796.5501.8.camel@intel.com> <1459195288.15523.3.camel@intel.com> <1459277829.6412.3.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1459277829.6412.3.camel@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Verma, Vishal L" Cc: "Williams, Dan J" , "linux-block@vger.kernel.org" , "xfs@oss.sgi.com" , "linux-mm@kvack.org" , "viro@zeniv.linux.org.uk" , "axboe@fb.com" , "akpm@linux-foundation.org" , "linux-nvdimm@lists.01.org" , "linux-fsdevel@vger.kernel.org" , "ross.zwisler@linux.intel.com" , "linux-ext4@vger.kernel.org" , "Wilcox, Matthew R" , "david@fromorbit.com" , "jack@suse.cz" On Tue 29-03-16 18:57:16, Verma, Vishal L wrote: > On Mon, 2016-03-28 at 16:34 -0700, Dan Williams wrote: > > <> > > > Seems kind of sad to fail the fault due to a bad block when we were > > going to zero it anyway, right? I'm not seeing a compelling reason to > > keep any zeroing in fs/dax.c. > > Agreed - but how do we do this? clear_pmem needs to be able to clear an > arbitrary number of bytes, but to go through the driver, we'd need to > send down a bio? If only the driver had an rw_bytes like interface that > could be used by anyone... :) Actually, my patches for page fault locking remove zeroing from dax_insert_mapping() and __dax_pmd_fault() - the zeroing now happens from the filesystem only and the zeroing in those two functions is just a dead code... Honza -- Jan Kara SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org