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authorEric W. Biederman <ebiederm@xmission.com>2010-03-30 11:31:25 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-21 09:37:31 -0700
commitbc451f2058238013e1cdf4acd443c01734d332f0 (patch)
tree16a1ca2f762edcfbda8f2a4afb6763ba7b090271 /drivers/base
parentba514a57f5c38d9d79ea15e75059e07f49238726 (diff)
downloadop-kernel-dev-bc451f2058238013e1cdf4acd443c01734d332f0.zip
op-kernel-dev-bc451f2058238013e1cdf4acd443c01734d332f0.tar.gz
kobj: Add basic infrastructure for dealing with namespaces.
Move complete knowledge of namespaces into the kobject layer so we can use that information when reporting kobjects to userspace. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/class.c9
-rw-r--r--drivers/base/core.c77
2 files changed, 72 insertions, 14 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 9c6a0d6..8e231d0 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -63,6 +63,14 @@ static void class_release(struct kobject *kobj)
kfree(cp);
}
+static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject *kobj)
+{
+ struct class_private *cp = to_class(kobj);
+ struct class *class = cp->class;
+
+ return class->ns_type;
+}
+
static const struct sysfs_ops class_sysfs_ops = {
.show = class_attr_show,
.store = class_attr_store,
@@ -71,6 +79,7 @@ static const struct sysfs_ops class_sysfs_ops = {
static struct kobj_type class_ktype = {
.sysfs_ops = &class_sysfs_ops,
.release = class_release,
+ .child_ns_type = class_child_ns_type,
};
/* Hotplug events for classes go to the class class_subsys */
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 356dd01..f0699918 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -131,9 +131,21 @@ static void device_release(struct kobject *kobj)
kfree(p);
}
+static const void *device_namespace(struct kobject *kobj)
+{
+ struct device *dev = to_dev(kobj);
+ const void *ns = NULL;
+
+ if (dev->class && dev->class->ns_type)
+ ns = dev->class->namespace(dev);
+
+ return ns;
+}
+
static struct kobj_type device_ktype = {
.release = device_release,
.sysfs_ops = &dev_sysfs_ops,
+ .namespace = device_namespace,
};
@@ -595,11 +607,59 @@ static struct kobject *virtual_device_parent(struct device *dev)
return virtual_dir;
}
-static struct kobject *get_device_parent(struct device *dev,
- struct device *parent)
+struct class_dir {
+ struct kobject kobj;
+ struct class *class;
+};
+
+#define to_class_dir(obj) container_of(obj, struct class_dir, kobj)
+
+static void class_dir_release(struct kobject *kobj)
+{
+ struct class_dir *dir = to_class_dir(kobj);
+ kfree(dir);
+}
+
+static const
+struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj)
{
+ struct class_dir *dir = to_class_dir(kobj);
+ return dir->class->ns_type;
+}
+
+static struct kobj_type class_dir_ktype = {
+ .release = class_dir_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+ .child_ns_type = class_dir_child_ns_type
+};
+
+static struct kobject *
+class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
+{
+ struct class_dir *dir;
int retval;
+ dir = kzalloc(sizeof(*dir), GFP_KERNEL);
+ if (!dir)
+ return NULL;
+
+ dir->class = class;
+ kobject_init(&dir->kobj, &class_dir_ktype);
+
+ dir->kobj.kset = &class->p->class_dirs;
+
+ retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name);
+ if (retval < 0) {
+ kobject_put(&dir->kobj);
+ return NULL;
+ }
+ return &dir->kobj;
+}
+
+
+static struct kobject *get_device_parent(struct device *dev,
+ struct device *parent)
+{
if (dev->class) {
static DEFINE_MUTEX(gdp_mutex);
struct kobject *kobj = NULL;
@@ -634,18 +694,7 @@ static struct kobject *get_device_parent(struct device *dev,
}
/* or create a new class-directory at the parent device */
- k = kobject_create();
- if (!k) {
- mutex_unlock(&gdp_mutex);
- return NULL;
- }
- k->kset = &dev->class->p->class_dirs;
- retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
- if (retval < 0) {
- mutex_unlock(&gdp_mutex);
- kobject_put(k);
- return NULL;
- }
+ k = class_dir_create_and_add(dev->class, parent_kobj);
/* do not emit an uevent for this simple "glue" directory */
mutex_unlock(&gdp_mutex);
return k;
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