Message ID | 20191217153635.44733-10-josef@toxicpanda.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <SRS0=yR0V=2H=vger.kernel.org=linux-btrfs-owner@kernel.org> Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 51FB514B7 for <patchwork-linux-btrfs@patchwork.kernel.org>; Tue, 17 Dec 2019 15:36:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3046524672 for <patchwork-linux-btrfs@patchwork.kernel.org>; Tue, 17 Dec 2019 15:36:57 +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="h3/aX26k" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727782AbfLQPg4 (ORCPT <rfc822;patchwork-linux-btrfs@patchwork.kernel.org>); Tue, 17 Dec 2019 10:36:56 -0500 Received: from mail-qv1-f67.google.com ([209.85.219.67]:33816 "EHLO mail-qv1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727360AbfLQPg4 (ORCPT <rfc822;linux-btrfs@vger.kernel.org>); Tue, 17 Dec 2019 10:36:56 -0500 Received: by mail-qv1-f67.google.com with SMTP id o18so4333402qvf.1 for <linux-btrfs@vger.kernel.org>; Tue, 17 Dec 2019 07:36:55 -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=TbWQBPE4IoDoquDDkXLWAW/nhtZspOmP74cbSr991NI=; b=h3/aX26k6cdGcpcQE0iu+bh8j6Wy/biU6c1QektJ2677Kp9OZBRlDM0pMPfJHUMIsL TKYszH0p/Dh1+/oRZ/GOXPw3HDQbAdinW1bfz4hlnK49BgZsvr9FB3ZXXZDYa7pjo8zo sF926J6Nfg1XZ5AkDisdkV+a9b4PYaPX2FqFbvEoNXNsZw9H6Rog5+qP6mSRE+9lfkmM 2HhyNc5wou34qSWxVYfuHZzYfdTN8iSoQr+M0/4EUhy79AQ4WEw8+aEg3vxZ55bv2j3b ZpijXnEHg202PiHkOuDTbwUr5b0v0Q6asR3GuiQttCzyrEVXHA5eAZT7NbP6ngNX++v7 thEA== 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=TbWQBPE4IoDoquDDkXLWAW/nhtZspOmP74cbSr991NI=; b=kf0zsY8HFl8HmTgFVv4JiPCr0ZHYSkX0/+aDzZsLOGQxUaaILGxqEGxQby0EARUC5W 9ATG85YtFMXqV4uhMjT3EOc5Q0AM9ZKDnZChLrxjXsl/LP4LIE1nJoPe0QFG6klXeEGd AiMp7k+hS7loMn5UeFdri6SH8RAwAF7QiZ3TO4oLGhzi+sBtl3cXPVp44YMBqrERnYvB ryPqKBeRYajE8wNTgjEzQ3dQd0d/fHsTBxsZE3dfPCpiJ4YuTNsne8eF8mpCqLpqvZRI vuiIItBRs1rJV9/MGfCT/MlQsg7U1SzYB6aFpFaWm2OwyfvbikuwJ6AFbysb2b2WwBo3 DDnA== X-Gm-Message-State: APjAAAWn/MFWAq6A5MmUO1jMLKCoGTI4yAz1sYJrVFFY7mteNBv9HgdK FQg+GP+fAnChFXk5e6qxCAgnqoTByerHZw== X-Google-Smtp-Source: APXvYqz+r/z7MfX2bNmEfxfBQQJioProChOiEUBmo0AZx3N/4qcxVI66VQVFoBMcpYAFcVtTo56UQA== X-Received: by 2002:a0c:ab8f:: with SMTP id j15mr5091592qvb.223.1576597014875; Tue, 17 Dec 2019 07:36:54 -0800 (PST) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id 68sm7188981qkj.102.2019.12.17.07.36.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Dec 2019 07:36:53 -0800 (PST) From: Josef Bacik <josef@toxicpanda.com> To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 09/45] btrfs: handle NULL roots in btrfs_put/btrfs_grab_fs_root Date: Tue, 17 Dec 2019 10:35:59 -0500 Message-Id: <20191217153635.44733-10-josef@toxicpanda.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191217153635.44733-1-josef@toxicpanda.com> References: <20191217153635.44733-1-josef@toxicpanda.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: <linux-btrfs.vger.kernel.org> X-Mailing-List: linux-btrfs@vger.kernel.org |
Series |
Cleanup how we handle root refs, part 1
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expand
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diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index 5b38558e164d..7e53da374715 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -88,6 +88,8 @@ struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); */ static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root) { + if (!root) + return NULL; if (refcount_inc_not_zero(&root->refs)) return root; return NULL; @@ -95,6 +97,8 @@ static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root) static inline void btrfs_put_fs_root(struct btrfs_root *root) { + if (!root) + return; if (refcount_dec_and_test(&root->refs)) kfree(root); }
We want to use this for dropping all roots, and in some error cases we may not have a root, so handle this to make the cleanup code easier. Make btrfs_grab_fs_root the same so we can use it in cases where the root may not exist (like the quota root). Signed-off-by: Josef Bacik <josef@toxicpanda.com> --- fs/btrfs/disk-io.h | 4 ++++ 1 file changed, 4 insertions(+)