From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from frost.carfax.org.uk ([85.119.82.111]:55253 "EHLO frost.carfax.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752324AbbDDNAw (ORCPT ); Sat, 4 Apr 2015 09:00:52 -0400 Date: Sat, 4 Apr 2015 13:00:47 +0000 From: Hugo Mills To: Russell Coker Cc: Duncan <1i5t5.duncan@cox.net>, linux-btrfs@vger.kernel.org Subject: Re: Btrfs hangs 3.19-10 Message-ID: <20150404130047.GC13864@carfax.org.uk> References: <20150402191312.1ee31af3@natsu> <201504041255.08052.russell@coker.com.au> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="H8ygTp4AXg6deix2" In-Reply-To: <201504041255.08052.russell@coker.com.au> Sender: linux-btrfs-owner@vger.kernel.org List-ID: --H8ygTp4AXg6deix2 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sat, Apr 04, 2015 at 12:55:08PM +0000, Russell Coker wrote: > On Fri, 3 Apr 2015 05:14:12 AM Duncan wrote: > > Well, btrfs itself isn't really stable yet... Stable series should be > > stable at least to the extent that whatever you're using in them is, but > > with btrfs itself not yet entirely stable... > > Also for stable operation you want both forward and backward compatability. > You could make an Ext3 filesystem and expect that any random ancient Linux box > you are likely to encounter can read it. Even Ext4 has been supported for a > long time and most systems you are likely to encounter won't have any problems > with it. > > I recently made a BTRFS filesystem on a Debian/Jessie system (kernel 3.16.7) > with default options and discovered that Debian/Wheezy (kernel 3.2.65) can't > read it. I think that one criteria for "stable" in a filesystem is that > kernels from a couple of previous releases can mount it. By that criteria > BTRFS won't be "stable" for use in Debian for about 4 years. > > As an aside are there options to mkfs.btrfs that would make a filesystem > mountable by kernel 3.2.65? If so I'll file a Debian/Jessie bug report > requesting that a specific mention be added to the man page. Yes, there are. It's probably -O^extref, but if you can show the dmesg output from the 3.2 kernel on the failed mount (so that it shows what the actual failure was), we should be able to give you a more precise answer. Hugo. -- Hugo Mills | Welcome to Hollywood, a land just off the coast of hugo@... carfax.org.uk | Planet Earth http://carfax.org.uk/ | PGP: 65E74AC0 | The Cat's Meow --H8ygTp4AXg6deix2 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJVH+B/AAoJEFheFHXiqx3kll8QAJMwcz/xpNIvv1jdxwJ4RL32 2caGCdU0NocYy4B48CaQH0vhzaTLtVc94eM8zSgKnCj0MalYDHxVCnK9NY7gdZ4p 2rvWrRJy86NI2cSrx5nwHSRlF+D7FoRkZCLcip8U88YbI6Sx/+2qSyPEG+o4gJnj OaFDDVZlXt0mWyTk6KKyGykxsB8bOvd6Yf6R6fZRZgtxuFOEyg1AHUaC30zfgDcS WggU8jHtKP7+8GMPw3Oo35I5y7e9Nsfn66+DBKJBD/KGCJYt3ihF2S03u/hHkFq3 zqKbaMMEdtE725HYk05A7AyrHmphexpPxMIwK0nZMuMY/0pgZEb8HxXwhk4mdodb d3zklRsc9OQZY7o2OFx8L/yJBzHMpAfgfdkJ6UYfDhWUGDlEKTa9UIuDpkgtMBGb Nru8KCo46Y5aiBkgSYf08CBqW6CoCn9SpBMwH+LXCNj4pzpCYd31i5+mJ6sBSCNO QeJzthsTOp4ZWbutnXn1muagIYicwsRp045p3jIduFSL/UJVlz1NecF9lazdltal ca2+Dd91ww78fQPPkMWQP5OZDepJfi43BoUgnkVD3pVd9XFmR7pjnnhiuFu3Walv 4jrgfw6IUPQ33GY1CsLusSZZA3zRS2rxTcNFpKOIQXL3gx+07pZ/Nba4m9ceDiUc mArWVD7eiLsFAeumsdbq =Iwso -----END PGP SIGNATURE----- --H8ygTp4AXg6deix2--