From patchwork Thu Jan 16 01:25:29 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Sterba X-Patchwork-Id: 3496141 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7C986C02DC for ; Thu, 16 Jan 2014 01:25:57 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A471B2017E for ; Thu, 16 Jan 2014 01:25:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C29F20170 for ; Thu, 16 Jan 2014 01:25:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752718AbaAPBZh (ORCPT ); Wed, 15 Jan 2014 20:25:37 -0500 Received: from cantor2.suse.de ([195.135.220.15]:60959 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752446AbaAPBZe (ORCPT ); Wed, 15 Jan 2014 20:25:34 -0500 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 1A1BAAC34 for ; Thu, 16 Jan 2014 01:25:33 +0000 (UTC) Received: by ds.suse.cz (Postfix, from userid 10065) id C982EDA8D7; Thu, 16 Jan 2014 02:25:32 +0100 (CET) From: David Sterba To: linux-btrfs@vger.kernel.org Cc: David Sterba Subject: [PATCH] btrfs: add simple debugfs interface Date: Thu, 16 Jan 2014 02:25:29 +0100 Message-Id: <1389835529-23944-1-git-send-email-dsterba@suse.cz> X-Mailer: git-send-email 1.8.5 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Help during debugging to export various interesting infromation and tunables without the need of extra mount options or ioctls. Usage: * declare your variable in sysfs.h, and include where you need it * define the variable in sysfs.c and make it visible via debugfs_create_TYPE Depends on CONFIG_DEBUG_FS. Signed-off-by: David Sterba --- fs/btrfs/sysfs.c | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index ba94b277e98d..d0023196e996 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "ctree.h" #include "disk-io.h" @@ -593,6 +594,12 @@ static int add_device_membership(struct btrfs_fs_info *fs_info) /* /sys/fs/btrfs/ entry */ static struct kset *btrfs_kset; +/* /sys/kernel/debug/btrfs */ +static struct dentry *btrfs_debugfs_root_dentry; + +/* Debugging tunables and exported data */ +u64 btrfs_debugfs_test; + int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) { int error; @@ -636,6 +643,18 @@ failure: return error; } +static int btrfs_init_debugfs(void) +{ +#ifdef CONFIG_DEBUG_FS + btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); + if (!btrfs_debugfs_root_dentry) + return -ENOMEM; + + debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, + &btrfs_debugfs_test); +#endif +} + int btrfs_init_sysfs(void) { int ret; @@ -643,6 +662,7 @@ int btrfs_init_sysfs(void) if (!btrfs_kset) return -ENOMEM; + btrfs_init_debugfs(); init_feature_attrs(); ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); @@ -658,5 +678,8 @@ void btrfs_exit_sysfs(void) { sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); kset_unregister(btrfs_kset); +#ifdef CONFIG_DEBUG_FS + debugfs_remove_recursive(btrfs_debugfs_root_dentry); +#endif }