From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8EDEC7EE2C for ; Mon, 15 May 2023 17:23:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244152AbjEORXo (ORCPT ); Mon, 15 May 2023 13:23:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244053AbjEORXR (ORCPT ); Mon, 15 May 2023 13:23:17 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 176DF44B6 for ; Mon, 15 May 2023 10:21:39 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id ECE4662C54 for ; Mon, 15 May 2023 17:21:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2F27C433D2; Mon, 15 May 2023 17:21:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684171298; bh=TU+tnQ2Ae9mEfDDSV50Mz2VLeYfxmFTYpNP8fYWtdf0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=twSXhjtLzlT9C0SKVqt3lKIpX0vqwV0lVBeohqjDpyHa6fuIGMJhobykVYUkDSvD8 KpM9O7A8FUm6UuWWbPS+Punhh1bLjqHwOUIenCaYPVHtpgMYD7zK0v5iCMxZxuvWUW DntimVD7OW3tfvPrW9Wgg3KGJLTg9A8H5eaVozFg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Anand Jain , Filipe Manana , David Sterba Subject: [PATCH 6.2 137/242] btrfs: fix space cache inconsistency after error loading it from disk Date: Mon, 15 May 2023 18:27:43 +0200 Message-Id: <20230515161726.012955435@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230515161721.802179972@linuxfoundation.org> References: <20230515161721.802179972@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Filipe Manana commit 0004ff15ea26015a0a3a6182dca3b9d1df32e2b7 upstream. When loading a free space cache from disk, at __load_free_space_cache(), if we fail to insert a bitmap entry, we still increment the number of total bitmaps in the btrfs_free_space_ctl structure, which is incorrect since we failed to add the bitmap entry. On error we then empty the cache by calling __btrfs_remove_free_space_cache(), which will result in getting the total bitmaps counter set to 1. A failure to load a free space cache is not critical, so if a failure happens we just rebuild the cache by scanning the extent tree, which happens at block-group.c:caching_thread(). Yet the failure will result in having the total bitmaps of the btrfs_free_space_ctl always bigger by 1 then the number of bitmap entries we have. So fix this by having the total bitmaps counter be incremented only if we successfully added the bitmap entry. Fixes: a67509c30079 ("Btrfs: add a io_ctl struct and helpers for dealing with the space cache") Reviewed-by: Anand Jain CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/free-space-cache.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -870,15 +870,16 @@ static int __load_free_space_cache(struc } spin_lock(&ctl->tree_lock); ret = link_free_space(ctl, e); - ctl->total_bitmaps++; - recalculate_thresholds(ctl); - spin_unlock(&ctl->tree_lock); if (ret) { + spin_unlock(&ctl->tree_lock); btrfs_err(fs_info, "Duplicate entries in free space cache, dumping"); kmem_cache_free(btrfs_free_space_cachep, e); goto free_cache; } + ctl->total_bitmaps++; + recalculate_thresholds(ctl); + spin_unlock(&ctl->tree_lock); list_add_tail(&e->list, &bitmaps); }