From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f72.google.com (mail-it0-f72.google.com [209.85.214.72]) by kanga.kvack.org (Postfix) with ESMTP id 71B676B02FA for ; Tue, 20 Jun 2017 11:42:57 -0400 (EDT) Received: by mail-it0-f72.google.com with SMTP id v184so111367450itc.15 for ; Tue, 20 Jun 2017 08:42:57 -0700 (PDT) Received: from mga05.intel.com (mga05.intel.com. [192.55.52.43]) by mx.google.com with ESMTPS id l67si6027188ith.144.2017.06.20.08.42.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 20 Jun 2017 08:42:56 -0700 (PDT) Date: Tue, 20 Jun 2017 09:42:55 -0600 From: Ross Zwisler Subject: Re: [RFC PATCH 2/2] mm, fs: daxfile, an interface for byte-addressable updates to pmem Message-ID: <20170620154255.GA2536@linux.intel.com> References: <149766212410.22552.15957843500156182524.stgit@dwillia2-desk3.amr.corp.intel.com> <149766213493.22552.4057048843646200083.stgit@dwillia2-desk3.amr.corp.intel.com> <20170620052214.GA3787@birch.djwong.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170620052214.GA3787@birch.djwong.org> Sender: owner-linux-mm@kvack.org List-ID: To: "Darrick J. Wong" Cc: Dan Williams , akpm@linux-foundation.org, Jan Kara , linux-nvdimm@lists.01.org, linux-api@vger.kernel.org, Dave Chinner , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Jeff Moyer , linux-fsdevel@vger.kernel.org, Ross Zwisler , Christoph Hellwig , xfs On Mon, Jun 19, 2017 at 10:22:14PM -0700, Darrick J. Wong wrote: <> > Fourth, the VFS entry points for things like read, write, truncate, > utimes, fallocate, etc. all just bail out if S_IOMAP_FROZEN is set on a > file, so that the block map cannot be modified. mmap is still allowed, > as we've discussed. /Maybe/ we can allow fallocate to extend a file > with zeroed extents (it will be slow) as I've heard murmurs about > wanting to be able to extend a file, maybe not. Read and write should still be allowed, right? -- 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