| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 5 Mar 2008 16:27:39 -0800
From: Joel Becker <joel.becker@...cle.com>
To: ocfs2-devel@....oracle.com
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
mark.fasheh@...cle.com
Subject: [PATCH 16/18] ocfs2: Create stack glue sysfs files.
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 <joel.becker@...cle.com>
---
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 <linux/module.h>
#include <linux/slab.h>
#include <linux/kmod.h>
+#include <linux/fs.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
#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");
--
1.5.3.8
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists