From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-01.dd24.net ([193.46.215.41]:56341 "EHLO mailgw01.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750725AbbDRFRz (ORCPT ); Sat, 18 Apr 2015 01:17:55 -0400 Message-ID: <1429334269.8371.75.camel@scientia.net> Subject: Re: how to clone a btrfs filesystem From: Christoph Anton Mitterer To: Russell Coker Cc: linux-btrfs Date: Sat, 18 Apr 2015 07:17:49 +0200 In-Reply-To: <201504180424.40385.russell@coker.com.au> References: <1429312124.8371.62.camel@scientia.net> <201504180424.40385.russell@coker.com.au> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-vaFsB486sgXZQdtISBbE" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-vaFsB486sgXZQdtISBbE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2015-04-18 at 04:24 +0000, Russell Coker wrote:=20 > dd works. ;) > There are patches to rsync that make it work on block devices. Of course= that=20 > will copy space occupied by deleted files too. I think both are not quite the solutions I was looking for. Guess for dd this is obvious, but for rsync I'd also loose all btrfs features like checksum verifications,... and even if these patches you mention would make it work on block devices, I'd guess it would at least need to read everything, it would not longer be a merge into another filesystem (perhaps I shouldn't have written "clone")... and the target block device would need to have at least the size of the origin. Can't one do something like the following: 1) The source fs has several snapshots and subvols. The target fs is empty (the first time). For the first time populating the target fs: 2) Make ro snapshots of all non-ro snapshots and subvols on the source-fs. 3) Send/receive the first of the ro snapshots to the target fs, with no parent and no clone-src. 4) Send/receive all further ro snapshots to the target fs, with no parents, but each time specifying one further clone-src (i.e. all that have already been sent/received) so that they're used for reflinks and so on 5) At the end somehow make rw-subvols from the snapshots/subvols that have been previously rw (how?). In the future, when an incremental backup should be made: 2) as above 3) Send/receive the each of the ro snapshots to the target fs, with using the exact matching ro snapshot on the other side as parent. (Would I need to give anything as clone-src??) Does that sound as if it would somehow work like that? Especially would it preserve all the reflink statuses and everything else (sparse files, etc.) Some additional questions: a) Can btrfs send change anything(!) on the source fs?=20 b) Can one abort (Ctrl-C) a send and/or receive... and make it continue at the same place were it was stopped? Thanks, Chris --=-vaFsB486sgXZQdtISBbE Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCCEZIw ggW/MIIDp6ADAgECAgMCOakwDQYJKoZIhvcNAQENBQAwVDEUMBIGA1UEChMLQ0FjZXJ0IEluYy4x HjAcBgNVBAsTFWh0dHA6Ly93d3cuQ0FjZXJ0Lm9yZzEcMBoGA1UEAxMTQ0FjZXJ0IENsYXNzIDMg Um9vdDAeFw0xNDA2MTIxNjM2MThaFw0xNjA2MTExNjM2MThaMHwxITAfBgNVBAMTGENocmlzdG9w aCBBbnRvbiBNaXR0ZXJlcjEkMCIGCSqGSIb3DQEJARYVY2FsZXN0eW9Ac2NpZW50aWEubmV0MTEw LwYJKoZIhvcNAQkBFiJtYWlsQGNocmlzdG9waC5hbnRvbi5taXR0ZXJlci5uYW1lMIIBIjANBgkq hkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4phP/j9vT9dZT+k3ffHxvRWMOuzBnu5O3Fl4y2+WL7pL rfLiEhWzGXhHvjSqpt4vCNSdqy43453nnu8+hMb+uEtqSIL1AHU5eLhuDNVN9S4bt9E7nA2WKYBU LCUi/xCD/GL7ToyJNwhrhzcCZ7pXSc3xVqFoC4f6weU9ExhoEZQNRpTM0BFCOi4fRxvKFNnUYgjK hqy0Ta5H0Xx86mAp0Q4dxoD7mhI5iTF6TRkUheELxF24JCuAf04M89Cwft6DRH1FpJ3yvgW2B5U5 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