Message ID | 30bc49ac37e7af23f71260f69df81d8d6c364dbf.1605215645.git.josef@toxicpanda.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <linux-btrfs-owner@kernel.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D298C388F7 for <linux-btrfs@archiver.kernel.org>; Thu, 12 Nov 2020 21:19:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3AC37216C4 for <linux-btrfs@archiver.kernel.org>; Thu, 12 Nov 2020 21:19:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=toxicpanda-com.20150623.gappssmtp.com header.i=@toxicpanda-com.20150623.gappssmtp.com header.b="1WT3gqRH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727208AbgKLVTZ (ORCPT <rfc822;linux-btrfs@archiver.kernel.org>); Thu, 12 Nov 2020 16:19:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726337AbgKLVTZ (ORCPT <rfc822;linux-btrfs@vger.kernel.org>); Thu, 12 Nov 2020 16:19:25 -0500 Received: from mail-qv1-xf43.google.com (mail-qv1-xf43.google.com [IPv6:2607:f8b0:4864:20::f43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1801EC0613D4 for <linux-btrfs@vger.kernel.org>; Thu, 12 Nov 2020 13:19:25 -0800 (PST) Received: by mail-qv1-xf43.google.com with SMTP id ec16so3590406qvb.0 for <linux-btrfs@vger.kernel.org>; Thu, 12 Nov 2020 13:19:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=xH3Ox0Mgc/zVfDLEJgesHypyregZQu4ghlZMZyUxMHA=; b=1WT3gqRHELPV0fGy/1joZRvjiwrvncIdX9da1pWjbqvFuhCpFZdiMsFCdYRqI9RBEh lwNp9zU0sEx+MzmQTDDJSiVMydwEezeAnbrjtrjLrTaWaG3DtPuDacsHp8EljgK0Enq7 FLF8Uge3GOi108zaioYQlTG/uz1Z+YnOZYlArHz0BFvMibWWxxOlhU8KGg7n6kPw9l/g okiNEZYCN8xPKiC6eV400xSGIN3gx1LR8P7h46LAfHV6lnPwVtgKbAiDHSBmojuZOrl+ jPj4YkfyVg0tqmczG5SBqyga9tTLJYjGQtb01oAtJvACOzkTQ8ljJhnYwmHo03kRUE86 ijeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xH3Ox0Mgc/zVfDLEJgesHypyregZQu4ghlZMZyUxMHA=; b=Bm1NZ8KYPTJdLRyxBcowvA/T0aHIuIx9zgrLgJm0G6MTYKM/YbgELOuilK8LA2NF04 y49YxrRaNG5MqhzIED3K7sv0Y2mqOXOmLoA2+CQmkcMeSrBIFrFeeeznr9GCy5Sbd+TW TAd9JSgHUnKxPbowJD0zNd23IjTnNazpFOwT7FZMHEUKFn89I9q4gkMEqeb9DWUmrRiN wUdVLJw0ZLtho15tYs7nMrIgE+Cmj3cPJhjO9KMUYWJJe2/yo8cZvvZ7LdtTMzk1YLn6 i2duR33jzYVWFzyx1uIW8AjnVJvz2nE4sKaHhew2zAObYJYwduFit6dKyaU0Il13eI5y SKCg== X-Gm-Message-State: AOAM532uYEbVo/5UNnMnOvYPfX0KeolKZrboqlwynscCO0GwBvXrthba pHd7Tv/uGUvnfrmV84dIa2EflSpp0UUJqQ== X-Google-Smtp-Source: ABdhPJx4Qvs1bS6ndlh70Zxll3aW3G4tNDuglTvKZBc7eBvcPYxSI21zi9lTcMUVO3G/pqVsjsQvhA== X-Received: by 2002:a0c:9c05:: with SMTP id v5mr1570925qve.7.1605215963533; Thu, 12 Nov 2020 13:19:23 -0800 (PST) Received: from localhost (cpe-174-109-172-136.nc.res.rr.com. [174.109.172.136]) by smtp.gmail.com with ESMTPSA id z6sm5147301qti.88.2020.11.12.13.19.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2020 13:19:22 -0800 (PST) From: Josef Bacik <josef@toxicpanda.com> To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 06/42] btrfs: handle errors from select_reloc_root() Date: Thu, 12 Nov 2020 16:18:33 -0500 Message-Id: <30bc49ac37e7af23f71260f69df81d8d6c364dbf.1605215645.git.josef@toxicpanda.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <cover.1605215645.git.josef@toxicpanda.com> References: <cover.1605215645.git.josef@toxicpanda.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: <linux-btrfs.vger.kernel.org> X-Mailing-List: linux-btrfs@vger.kernel.org |
Series |
Cleanup error handling in relocation
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expand
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diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index bc598eb014fd..a94671199e8d 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -2056,7 +2056,7 @@ struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, break; } if (!root) - return NULL; + return ERR_PTR(-ENOENT); next = node; /* setup backref node path for btrfs_reloc_cow_block */ @@ -2231,7 +2231,18 @@ static int do_relocation(struct btrfs_trans_handle *trans, upper = edge->node[UPPER]; root = select_reloc_root(trans, rc, upper, edges); - BUG_ON(!root); + if (IS_ERR(root)) { + err = PTR_ERR(root); + + /* + * This can happen if there's fs corruption, but if we + * have ASSERT()'s on then we're developers and we + * likely made a logic mistake in the backref code, so + * check for this error condition. + */ + ASSERT(err != -ENOENT); + goto next; + } if (upper->eb && !upper->locked) { if (!lowest) {
Currently select_reloc_root() doesn't return an error, but followup patches will make it possible for it to return an error. We do have proper error recovery in do_relocation however, so handle the possibility of select_reloc_root() having an error properly instead of BUG_ON(!root). I've also adjusted select_reloc_root() to return ERR_PTR(-ENOENT) if we don't find a root, instead of NULL, to make the error case easier to deal with. I've replaced the BUG_ON(!root) with an ASSERT(ret != -ENOENT), as this indicates we messed up the backref walking code, but could indicate corruption so we do not want to have a BUG_ON() here. Signed-off-by: Josef Bacik <josef@toxicpanda.com> --- fs/btrfs/relocation.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)