From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from frost.carfax.org.uk ([85.119.82.111]:38460 "EHLO frost.carfax.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750777AbaANJic (ORCPT ); Tue, 14 Jan 2014 04:38:32 -0500 Date: Tue, 14 Jan 2014 09:38:08 +0000 From: Hugo Mills To: Duncan <1i5t5.duncan@cox.net> Cc: linux-btrfs@vger.kernel.org Subject: Re: btrfsck does not fix Message-ID: <20140114093808.GD7221@carfax.org.uk> References: <52C87B67.1040503@friedels.name> <52CC65C9.3090605@friedels.name> <52D08812.3040707@friedels.name> <0FFB7595-0A34-424C-BFC5-CCF6098A7801@colorremedies.com> <52D317CF.2070007@friedels.name> <4A0D47A5-0FBC-488E-83E9-311FE89DBB03@colorremedies.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="C1iGAkRnbeBonpVg" In-Reply-To: Sender: linux-btrfs-owner@vger.kernel.org List-ID: --C1iGAkRnbeBonpVg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Jan 14, 2014 at 09:30:14AM +0000, Duncan wrote: > Chris Murphy posted on Tue, 14 Jan 2014 00:49:13 -0700 as excerpted: > > > On Jan 13, 2014, at 11:03 PM, Duncan <1i5t5.duncan@cox.net> wrote: > > > >> Chris Murphy posted on Mon, 13 Jan 2014 17:40:33 -0700 as excerpted: > >> > >>> btrfs-image -c 9-t 4 /dev/sdX /mnt/ > >>> > >>> You can keep it handy in case a dev asks for it or you can attach it > >>> to a kernel.org bug report. > >> > >> How big are they? manpage says it's metadata only (data is zeroed), > >> so I'd guess one could expect it to be about metadata size as reported > >> by btrfs fi df? > > > > # btrfs fi df /mnt/isos > > Metadata, DUP: total=1.00GiB, used=289.53MiB > > > > 193M -rw-r--r--. 1 root root 193M Jan 14 00:44 sdb.img > > > > Guess that's too big to attach to a bugzilla bug. > > ~ 290 MiB metadata, ~ 190 MiB btrfs-image. So roughly 2/3 the size of > metadata. Metadata minus file tails (which are actually data, thus > should be zeroed)? > > Thanks. > > I wonder if it compresses? Yes, that's the -c9 option, and it compresses fairly well. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Questions are a burden, and answers a prison for oneself. --- --C1iGAkRnbeBonpVg Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) iQIVAwUBUtUFgFheFHXiqx3kAQJC8BAAvUHT5IfRurckeRvNOCqoV3BWugjY/YW7 P7bgq33WdOBch0KApIfUZPtI5UNEtC5lWElaC+WhsBvqrBx4IH5GvG50aBcrO/Wn neLghuo38CPOBNyzxzJHpGnJVvbBPVazL8kMQ1BWTyalAGJzBcJjSg3Hj0EV6Cv2 3SSK01N29/z7an7S/mX/e7BO7djVyyR+M1/qh8YoxJv2H/30QH2rc3zQXgbKefsP HadWrcu7QJ5xF94khJN/FUz7d94hZkSPvp60BABtNeOL751PL/NXRLuhjXchd99V gwqPpQLXL0OJ/3Zge8bat5qnJqLAEAPg88nLTVL/e0IX2ftdyoBs1Qvpe1BCBsGE Cv1fDJVJhVgrTdeskgzhecBIqmNAXp10amA7cRAxCqaEo1Hlbf+NpmhsB2uVuiim 7VxLbv3aocRJ4iaFqqeibew+VS/yw0JJqMpx9b16i0yVxtjEOcnJcO4SO+85pr1i vwFJn7TdDFN3vviUIHdYfkagHDit4XIZdmXO4ZXXxlLJfeXbkXdR6XxUtTVyUHW0 lFvJz1yBblTsaTOYWDRNRmjsd1cBsJxbPkypfp0haz3UFegGfZxIPFNqBxeXiWA6 IbSQ4vue1zqMg6E4zb9xe0rM6MPE7gcSEA9cA8DWiWKGli6bdkPV/PiVLW+KhVhZ IjeRfw6CaeU= =SVwM -----END PGP SIGNATURE----- --C1iGAkRnbeBonpVg--