Currently there exists the kset_create_and_add() helper that does not allow to have a different ktype for the created kset kobject. To allow a different ktype this patch will introduce the function kset_type_create_and_add() that allows to set a different ktype instead of using the global default kset_ktype variable. In my example I need to separate the created kobject inside the kset by net-namespaces. This patch allows me to do that by providing a user defined kobj_type structure that implements the necessary namespace functionality. Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx> --- include/linux/kobject.h | 8 ++++-- lib/kobject.c | 59 ++++++++++++++++++++++++++++++----------- 2 files changed, 50 insertions(+), 17 deletions(-) diff --git a/include/linux/kobject.h b/include/linux/kobject.h index c8219505a79f..7504b7547ed2 100644 --- a/include/linux/kobject.h +++ b/include/linux/kobject.h @@ -175,8 +175,12 @@ struct kset { void kset_init(struct kset *kset); int __must_check kset_register(struct kset *kset); void kset_unregister(struct kset *kset); -struct kset * __must_check kset_create_and_add(const char *name, const struct kset_uevent_ops *u, - struct kobject *parent_kobj); +struct kset * __must_check +kset_type_create_and_add(const char *name, const struct kset_uevent_ops *u, + struct kobject *parent_kobj, const struct kobj_type *ktype); +struct kset * __must_check +kset_create_and_add(const char *name, const struct kset_uevent_ops *u, + struct kobject *parent_kobj); static inline struct kset *to_kset(struct kobject *kobj) { diff --git a/lib/kobject.c b/lib/kobject.c index 72fa20f405f1..09dd3d4c7f56 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -946,6 +946,7 @@ static const struct kobj_type kset_ktype = { * @name: the name for the kset * @uevent_ops: a struct kset_uevent_ops for the kset * @parent_kobj: the parent kobject of this kset, if any. + * @ktype: a struct kobj_type for the kset * * This function creates a kset structure dynamically. This structure can * then be registered with the system and show up in sysfs with a call to @@ -957,7 +958,8 @@ static const struct kobj_type kset_ktype = { */ static struct kset *kset_create(const char *name, const struct kset_uevent_ops *uevent_ops, - struct kobject *parent_kobj) + struct kobject *parent_kobj, + const struct kobj_type *ktype) { struct kset *kset; int retval; @@ -973,39 +975,38 @@ static struct kset *kset_create(const char *name, kset->uevent_ops = uevent_ops; kset->kobj.parent = parent_kobj; - /* - * The kobject of this kset will have a type of kset_ktype and belong to - * no kset itself. That way we can properly free it when it is - * finished being used. - */ - kset->kobj.ktype = &kset_ktype; + kset->kobj.ktype = ktype; kset->kobj.kset = NULL; return kset; } /** - * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs. + * kset_type_create_and_add() - Create a struct kset with kobj_type dynamically + * and add it to sysfs. * * @name: the name for the kset * @uevent_ops: a struct kset_uevent_ops for the kset * @parent_kobj: the parent kobject of this kset, if any. + * @ktype: a struct kobj_type for the kset * - * This function creates a kset structure dynamically and registers it - * with sysfs. When you are finished with this structure, call + * This function creates a kset structure with ktype structure dynamically and + * registers it with sysfs. When you are finished with this structure, call * kset_unregister() and the structure will be dynamically freed when it - * is no longer being used. + * is no longer being used. Works like kset_create_and_add() just with the + * possibility to assign kobj_type to the kset. * * If the kset was not able to be created, NULL will be returned. */ -struct kset *kset_create_and_add(const char *name, - const struct kset_uevent_ops *uevent_ops, - struct kobject *parent_kobj) +struct kset *kset_type_create_and_add(const char *name, + const struct kset_uevent_ops *uevent_ops, + struct kobject *parent_kobj, + const struct kobj_type *ktype) { struct kset *kset; int error; - kset = kset_create(name, uevent_ops, parent_kobj); + kset = kset_create(name, uevent_ops, parent_kobj, ktype); if (!kset) return NULL; error = kset_register(kset); @@ -1015,6 +1016,34 @@ struct kset *kset_create_and_add(const char *name, } return kset; } +EXPORT_SYMBOL_GPL(kset_type_create_and_add); + +/** + * kset_create_and_add() - Create a struct kset dynamically and add it to sysfs. + * + * @name: the name for the kset + * @uevent_ops: a struct kset_uevent_ops for the kset + * @parent_kobj: the parent kobject of this kset, if any. + * + * This function creates a kset structure dynamically and registers it + * with sysfs. When you are finished with this structure, call + * kset_unregister() and the structure will be dynamically freed when it + * is no longer being used. + * + * If the kset was not able to be created, NULL will be returned. + */ +struct kset *kset_create_and_add(const char *name, + const struct kset_uevent_ops *uevent_ops, + struct kobject *parent_kobj) +{ + /* + * The kobject of this kset will have a type of kset_ktype and belong to + * no kset itself. That way we can properly free it when it is + * finished being used. + */ + return kset_type_create_and_add(name, uevent_ops, parent_kobj, + &kset_ktype); +} EXPORT_SYMBOL_GPL(kset_create_and_add); -- 2.43.0