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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 1388CC433E2 for ; Fri, 11 Sep 2020 17:31:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CB579221E7 for ; Fri, 11 Sep 2020 17:31:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599845499; bh=IsVOSbbTfRCzjXHFy6RzbyMiobywS2BfjcvnnzG8+hQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OODFta1w18yMa4khvRb+E62Guf1aR0iFZfXvGQGEm4oFG4NIGzS6Y5Vym7AGpLmmJ DwqmRB7ly70HFTYZ6WSyEhb4/+iE+LDkfiY+jubPvbHnL6UgV5aV+X/jUKKKZ4EJD/ 7NRsMJA/DYU/XL4aei9veYvI1E2PomUQ7SOJXtIU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726495AbgIKRbg (ORCPT ); Fri, 11 Sep 2020 13:31:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:48794 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726065AbgIKMze (ORCPT ); Fri, 11 Sep 2020 08:55:34 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 547CE221E3; Fri, 11 Sep 2020 12:54:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599828877; bh=IsVOSbbTfRCzjXHFy6RzbyMiobywS2BfjcvnnzG8+hQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0socJZ5QKHmoj0nneIB66rAjGkkLARY6TU+tOf3DnrjpC6FO2xLUpCLR2LxbKqLnX 6irWkMvLfixNJjy5IYzCJ5yIxvQpGED7St5s6/tpZpQ/TdX/FlNHoDI4Q4NTnSFQli fpVZD4ws1BCxVb2PFumk4tld1mO763NosgJB2GBY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nikolay Borisov , David Sterba , Sasha Levin Subject: [PATCH 4.4 24/62] btrfs: Remove extraneous extent_buffer_get from tree_mod_log_rewind Date: Fri, 11 Sep 2020 14:46:07 +0200 Message-Id: <20200911122503.601915915@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200911122502.395450276@linuxfoundation.org> References: <20200911122502.395450276@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nikolay Borisov [ Upstream commit 24cee18a1c1d7c731ea5987e0c99daea22ae7f4a ] When a rewound buffer is created it already has a ref count of 1 and the dummy flag set. Then another ref is taken bumping the count to 2. Finally when this buffer is released from btrfs_release_path the extra reference is decremented by the special handling code in free_extent_buffer. However, this special code is in fact redundant sinca ref count of 1 is still correct since the buffer is only accessed via btrfs_path struct. This paves the way forward of removing the special handling in free_extent_buffer. Signed-off-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/ctree.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 8765312743f16..a8660b503bf36 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1372,7 +1372,6 @@ tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct btrfs_path *path, btrfs_tree_read_unlock_blocking(eb); free_extent_buffer(eb); - extent_buffer_get(eb_rewin); btrfs_tree_read_lock(eb_rewin); __tree_mod_log_rewind(fs_info, eb_rewin, time_seq, tm); WARN_ON(btrfs_header_nritems(eb_rewin) > -- 2.25.1