From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cantor2.suse.de ([195.135.220.15]:41009 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751974AbaA3RZE (ORCPT ); Thu, 30 Jan 2014 12:25:04 -0500 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 9AEDFAC5D for ; Thu, 30 Jan 2014 17:25:02 +0000 (UTC) From: David Sterba To: linux-btrfs@vger.kernel.org Cc: David Sterba Subject: [PATCH v2] btrfs: add simple debugfs interface Date: Thu, 30 Jan 2014 18:25:00 +0100 Message-Id: <1391102700-6779-1-git-send-email-dsterba@suse.cz> Sender: linux-btrfs-owner@vger.kernel.org List-ID: 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 --- v2: - added missing return to btrfs_init_debugfs - updated error handling to btrfs_init_sysfs, the cleanup is done in btrfs_exit_sysfs - removed #ifdef in btrfs_exit_sysfs, fs/btrfs/sysfs.c | 33 +++++++++++++++++++++++++++------ 1 files changed, 27 insertions(+), 6 deletions(-) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 782374d8fd19..b725e4574448 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; @@ -636,27 +643,41 @@ 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 + return 0; +} + int btrfs_init_sysfs(void) { int ret; + btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); if (!btrfs_kset) return -ENOMEM; - init_feature_attrs(); + ret = btrfs_init_debugfs(); + if (ret) + return ret; + init_feature_attrs(); ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); - if (ret) { - kset_unregister(btrfs_kset); - return ret; - } - return 0; + return ret; } void btrfs_exit_sysfs(void) { sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); kset_unregister(btrfs_kset); + debugfs_remove_recursive(btrfs_debugfs_root_dentry); } -- 1.7.9