kset: convert ocfs2 to use kset_create

Dynamically create the kset instead of declaring it statically.

Also use the new kobj_attribute which cleans up this file a _lot_.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Cc: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 21 insertions, 62 deletions

diff --git a/fs/ocfs2/cluster/sys.c b/fs/ocfs2/cluster/sys.c
index 880d0138bb0a..a4b07730b2e1 100644
--- a/fs/ocfs2/cluster/sys.c
+++ b/fs/ocfs2/cluster/sys.c
@@ -28,96 +28,55 @@
 #include <linux/module.h>
 #include <linux/kobject.h>
 #include <linux/sysfs.h>
+#include <linux/fs.h>
 
 #include "ocfs2_nodemanager.h"
 #include "masklog.h"
 #include "sys.h"
 
-struct o2cb_attribute {
-        struct attribute        attr;
-        ssize_t (*show)(char *buf);
-        ssize_t (*store)(const char *buf, size_t count);
-};
-
-#define O2CB_ATTR(_name, _mode, _show, _store)  \
-struct o2cb_attribute o2cb_attr_##_name = __ATTR(_name, _mode, _show, _store)
-
-#define to_o2cb_attr(_attr) container_of(_attr, struct o2cb_attribute, attr)
 
-static ssize_t o2cb_interface_revision_show(char *buf)
+static ssize_t version_show(struct kobject *kobj, struct kobj_attribute *attr,
+                            char *buf)
 {
         return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION);
 }
-
-static O2CB_ATTR(interface_revision, S_IFREG | S_IRUGO, o2cb_interface_revision_show, NULL);
+static struct kobj_attribute attr_version =
+        __ATTR(interface_revision, S_IFREG | S_IRUGO, version_show, NULL);
 
 static struct attribute *o2cb_attrs[] = {
-        &o2cb_attr_interface_revision.attr,
+        &attr_version.attr,
         NULL,
 };
 
-static ssize_t
-o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer);
-static ssize_t
-o2cb_store(struct kobject * kobj, struct attribute * attr,
-           const char * buffer, size_t count);
-static struct sysfs_ops o2cb_sysfs_ops = {
-        .show   = o2cb_show,
-        .store  = o2cb_store,
+static struct attribute_group o2cb_attr_group = {
+        .attrs = o2cb_attrs,
 };
 
-static struct kobj_type o2cb_subsys_type = {
-        .default_attrs  = o2cb_attrs,
-        .sysfs_ops      = &o2cb_sysfs_ops,
-};
-
-/* gives us o2cb_subsys */
-static decl_subsys(o2cb, NULL);
-
-static ssize_t
-o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer)
-{
-        struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr);
-        struct kset *sbs = to_kset(kobj);
-
-        BUG_ON(sbs != &o2cb_subsys);
-
-        if (o2cb_attr->show)
-                return o2cb_attr->show(buffer);
-        return -EIO;
-}
-
-static ssize_t
-o2cb_store(struct kobject * kobj, struct attribute * attr,
-             const char * buffer, size_t count)
-{
-        struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr);
-        struct kset *sbs = to_kset(kobj);
-
-        BUG_ON(sbs != &o2cb_subsys);
-
-        if (o2cb_attr->store)
-                return o2cb_attr->store(buffer, count);
-        return -EIO;
-}
+static struct kset *o2cb_kset;
 
 void o2cb_sys_shutdown(void)
 {
         mlog_sys_shutdown();
-        subsystem_unregister(&o2cb_subsys);
+        kset_unregister(o2cb_kset);
 }
 
 int o2cb_sys_init(void)
 {
         int ret;
 
-        o2cb_subsys.kobj.ktype = &o2cb_subsys_type;
-        ret = subsystem_register(&o2cb_subsys);
+        o2cb_kset = kset_create_and_add("o2cb", NULL, fs_kobj);
+        if (!o2cb_kset)
+                return -ENOMEM;
+
+        ret = sysfs_create_group(&o2cb_kset->kobj, &o2cb_attr_group);
         if (ret)
-                return ret;
+                goto error;
 
-        ret = mlog_sys_init(&o2cb_subsys);
+        ret = mlog_sys_init(o2cb_kset);
         if (ret)
-                subsystem_unregister(&o2cb_subsys);
+                goto error;
+        return 0;
+error:
+        kset_unregister(o2cb_kset);
         return ret;
 }