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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 DCF25C2D0EC for ; Fri, 10 Apr 2020 03:55:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B4CBE20BED for ; Fri, 10 Apr 2020 03:55:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586490938; bh=Nt6HnPG8US2WoIQ/AddHcN7oFr4OwpjsIl0UXaEifGM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ou7mPijpygNc9S7dOBVwm/M5b8E6vL9QrP8CXDfsE2CiHYRTbeS3khvF7K62NF7nm Vb+ro+bp5GqJsdF0Czq/6z2RxsscIWpZ1ywcas8dRGTKW4kVESOEX/W3D0b8m6zzd/ TwM8BV7xeje9KclNEN3m97SQJJJQa/S7+QJdmPms= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728742AbgDJDuA (ORCPT ); Thu, 9 Apr 2020 23:50:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:34352 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728729AbgDJDt6 (ORCPT ); Thu, 9 Apr 2020 23:49:58 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4F8C3206C0; Fri, 10 Apr 2020 03:49:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586490599; bh=Nt6HnPG8US2WoIQ/AddHcN7oFr4OwpjsIl0UXaEifGM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ICZkK26xPe9OXFQmbeQZUkFZpwLUE5U0nQ66lulIq5qRyXu93KmeDiMdVMnQNaato otOMZcbobtwyS0NlhuhPINWK48iblc2ENNLYwhHGoaI6RXzip5TXHYbyjP/Nn1rJEW meTk/N9nGiZqIwmFcXQkftxK6yJtCBShb0yjjNbc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Josef Bacik , David Sterba , Sasha Levin , linux-btrfs@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 42/46] btrfs: hold a ref on the root in btrfs_recover_relocation Date: Thu, 9 Apr 2020 23:49:05 -0400 Message-Id: <20200410034909.8922-42-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200410034909.8922-1-sashal@kernel.org> References: <20200410034909.8922-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Josef Bacik [ Upstream commit 932fd26df8125a5b14438563c4d3e33f59ba80f7 ] We look up the fs root in various places in here when recovering from a crashed relcoation. Make sure we hold a ref on the root whenever we look them up. Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/relocation.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index bc1d7f144ace9..4abdf3ec81c18 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -4550,6 +4550,12 @@ int btrfs_recover_relocation(struct btrfs_root *root) err = ret; goto out; } + } else { + if (!btrfs_grab_fs_root(fs_root)) { + err = -ENOENT; + goto out; + } + btrfs_put_fs_root(fs_root); } } @@ -4599,10 +4605,15 @@ int btrfs_recover_relocation(struct btrfs_root *root) list_add_tail(&reloc_root->root_list, &reloc_roots); goto out_free; } + if (!btrfs_grab_fs_root(fs_root)) { + err = -ENOENT; + goto out_free; + } err = __add_reloc_root(reloc_root); BUG_ON(err < 0); /* -ENOMEM or logic error */ fs_root->reloc_root = reloc_root; + btrfs_put_fs_root(fs_root); } err = btrfs_commit_transaction(trans); @@ -4634,10 +4645,14 @@ int btrfs_recover_relocation(struct btrfs_root *root) if (err == 0) { /* cleanup orphan inode in data relocation tree */ fs_root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); - if (IS_ERR(fs_root)) + if (IS_ERR(fs_root)) { err = PTR_ERR(fs_root); - else - err = btrfs_orphan_cleanup(fs_root); + } else { + if (btrfs_grab_fs_root(fs_root)) { + err = btrfs_orphan_cleanup(fs_root); + btrfs_put_fs_root(fs_root); + } + } } return err; } -- 2.20.1