From patchwork Sat Feb 8 15:46:35 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Shilong X-Patchwork-Id: 3610401 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 821BABF418 for ; Sat, 8 Feb 2014 15:48:49 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BB61F20163 for ; Sat, 8 Feb 2014 15:48:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9D77F2011D for ; Sat, 8 Feb 2014 15:48:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751818AbaBHPso (ORCPT ); Sat, 8 Feb 2014 10:48:44 -0500 Received: from mail-pa0-f50.google.com ([209.85.220.50]:54898 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751514AbaBHPso (ORCPT ); Sat, 8 Feb 2014 10:48:44 -0500 Received: by mail-pa0-f50.google.com with SMTP id kp14so4413600pab.37 for ; Sat, 08 Feb 2014 07:48:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id; bh=MmxIvtTIVzhT29+MdIrtyeLRbnwERYl3422Yygr1kuQ=; b=kNpmB0umD1VRGMOQF1asIc+FoIsRmaK38h7tArsoNEK2QEerfuBCi4DMrQ1XLAXd5L WgUq0nL3piKIP6z7ntj7bt1PRWg9CmtbNc1Gs+qRlx5LWMn2IoHTTOzMKSyVQDUQXj9+ XpddKoVYNdwvCyP5g7TrUWITpKUa0JjwCM6Gf5Nhp5G0yPdKKZny+f+dRo2WClWkJkrl wChW58VZhzZe8NxYQNYBEKwtrza/u6zCIHRm2hfTAdYlG0g/hN3LchyYGUWbwoy0HuoX SbZMAfRBaNdcSc1ujkaB+gfk/cErD3KonJqCJ41O7IQs0zOBRIWeXQuUQy3krPAlOIYB srhQ== X-Received: by 10.68.66.1 with SMTP id b1mr26682143pbt.43.1391874523673; Sat, 08 Feb 2014 07:48:43 -0800 (PST) Received: from linux-b0ol.site ([223.65.140.111]) by mx.google.com with ESMTPSA id hb10sm24763222pbd.1.2014.02.08.07.48.41 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 08 Feb 2014 07:48:42 -0800 (PST) From: Wang Shilong To: linux-btrfs@vger.kernel.org Cc: Wang Shilong Subject: [PATCH 1/2] Btrfs: skip readonly root for snapshot-aware defragment Date: Sat, 8 Feb 2014 23:46:35 +0800 Message-Id: <1391874396-2273-1-git-send-email-wangshilong1991@gmail.com> X-Mailer: git-send-email 1.8.4 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.3 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Wang Shilong Btrfs send is assuming readonly root won't change, let's skip readonly root. Signed-off-by: Wang Shilong --- fs/btrfs/inode.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 1af34d0..e8dfd83 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2239,6 +2239,11 @@ static noinline int relink_extent_backref(struct btrfs_path *path, return PTR_ERR(root); } + if (btrfs_root_readonly(root)) { + srcu_read_unlock(&fs_info->subvol_srcu, index); + return 0; + } + /* step 2: get inode */ key.objectid = backref->inum; key.type = BTRFS_INODE_ITEM_KEY;