From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763828AbYDBUY7 (ORCPT ); Wed, 2 Apr 2008 16:24:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761618AbYDBURb (ORCPT ); Wed, 2 Apr 2008 16:17:31 -0400 Received: from ns.suse.de ([195.135.220.2]:36611 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760661AbYDBUR1 (ORCPT ); Wed, 2 Apr 2008 16:17:27 -0400 From: Mark Fasheh To: linux-kernel@vger.kernel.org Cc: ocfs2-devel@oss.oracle.com, Joel Becker Subject: [PATCH 23/62] ocfs2: Create stack glue sysfs files. Date: Wed, 2 Apr 2008 13:14:33 -0700 Message-Id: <12071673661674-git-send-email-mfasheh@suse.com> X-Mailer: git-send-email 1.5.2.4 In-Reply-To: <1207167363119-git-send-email-mfasheh@suse.com> References: <12071673121124-git-send-email-mfasheh@suse.com> <1207167318479-git-send-email-mfasheh@suse.com> <12071673203909-git-send-email-mfasheh@suse.com> <12071673232465-git-send-email-mfasheh@suse.com> <12071673263948-git-send-email-mfasheh@suse.com> <12071673282579-git-send-email-mfasheh@suse.com> <1207167330482-git-send-email-mfasheh@suse.com> <12071673321172-git-send-email-mfasheh@suse.com> <12071673341888-git-send-email-mfasheh@suse.com> <12071673362069-git-send-email-mfasheh@suse.com> <12071673391031-git-send-email-mfasheh@suse.com> <12071673413492-git-send-email-mfasheh@suse.com> <1207167343926-git-send-email-mfasheh@suse.com> <12071673461268-git-send-email-mfasheh@suse.com> <12071673481928-git-send-email-mfasheh@suse.com> <12071673492775-git-send-email-mfasheh@suse.com> <12071673511262-git-send-email-mfasheh@suse.com> <12071673543752-git-send-email-mfasheh@suse.com> <1207167355295-git-send-email-mfasheh@suse.com> <12071673571757-git-send-email-mfasheh@suse.com> <12071673591158-git-send-email-mfasheh@suse.com> <12071673613757-git-send-email-mfasheh@suse.com> <1207167363119-git-send-email-mfasheh@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joel Becker Introduce a set of sysfs files that describe the current stack glue state. The files live under /sys/fs/ocfs2. The locking_protocol file displays the version of ocfs2's locking code. The loaded_cluster_plugins file displays all of the currently loaded stack plugins. When filesystems are mounted, the active_cluster_plugin file will display the plugin in use. Signed-off-by: Joel Becker Signed-off-by: Mark Fasheh --- fs/ocfs2/stackglue.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 120 insertions(+), 1 deletions(-) diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c index 1978c9c..76ae4fc 100644 --- a/fs/ocfs2/stackglue.c +++ b/fs/ocfs2/stackglue.c @@ -23,6 +23,9 @@ #include #include #include +#include +#include +#include #include "stackglue.h" @@ -335,14 +338,130 @@ int ocfs2_cluster_this_node(unsigned int *node) EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); -static int __init ocfs2_stack_glue_init(void) +/* + * Sysfs bits + */ + +static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + ssize_t ret = 0; + + spin_lock(&ocfs2_stack_lock); + if (lproto) + ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", + lproto->lp_max_version.pv_major, + lproto->lp_max_version.pv_minor); + spin_unlock(&ocfs2_stack_lock); + + return ret; +} + +static struct kobj_attribute ocfs2_attr_max_locking_protocol = + __ATTR(max_locking_protocol, S_IFREG | S_IRUGO, + ocfs2_max_locking_protocol_show, NULL); + +static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) { + ssize_t ret = 0, total = 0, remain = PAGE_SIZE; + struct ocfs2_stack_plugin *p; + + spin_lock(&ocfs2_stack_lock); + list_for_each_entry(p, &ocfs2_stack_list, sp_list) { + ret = snprintf(buf, remain, "%s\n", + p->sp_name); + if (ret < 0) { + total = ret; + break; + } + if (ret == remain) { + /* snprintf() didn't fit */ + total = -E2BIG; + break; + } + total += ret; + remain -= ret; + } + spin_unlock(&ocfs2_stack_lock); + + return total; +} + +static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins = + __ATTR(loaded_cluster_plugins, S_IFREG | S_IRUGO, + ocfs2_loaded_cluster_plugins_show, NULL); + +static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + ssize_t ret = 0; + + spin_lock(&ocfs2_stack_lock); + if (active_stack) { + ret = snprintf(buf, PAGE_SIZE, "%s\n", + active_stack->sp_name); + if (ret == PAGE_SIZE) + ret = -E2BIG; + } + spin_unlock(&ocfs2_stack_lock); + + return ret; +} + +static struct kobj_attribute ocfs2_attr_active_cluster_plugin = + __ATTR(active_cluster_plugin, S_IFREG | S_IRUGO, + ocfs2_active_cluster_plugin_show, NULL); + +static struct attribute *ocfs2_attrs[] = { + &ocfs2_attr_max_locking_protocol.attr, + &ocfs2_attr_loaded_cluster_plugins.attr, + &ocfs2_attr_active_cluster_plugin.attr, + NULL, +}; + +static struct attribute_group ocfs2_attr_group = { + .attrs = ocfs2_attrs, +}; + +static struct kset *ocfs2_kset; + +static void ocfs2_sysfs_exit(void) +{ + kset_unregister(ocfs2_kset); +} + +static int ocfs2_sysfs_init(void) +{ + int ret; + + ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); + if (!ocfs2_kset) + return -ENOMEM; + + ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); + if (ret) + goto error; + return 0; + +error: + kset_unregister(ocfs2_kset); + return ret; +} + +static int __init ocfs2_stack_glue_init(void) +{ + return ocfs2_sysfs_init(); } static void __exit ocfs2_stack_glue_exit(void) { lproto = NULL; + ocfs2_sysfs_exit(); } MODULE_AUTHOR("Oracle"); -- 1.5.4.1