Quelle kobject_ns.h Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Kernel object name space definitions
*
* Copyright (c) 2002-2003 Patrick Mochel
* Copyright (c) 2002-2003 Open Source Development Labs
* Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (c) 2006-2008 Novell Inc.
*
* Split from kobject.h by David Howells (dhowells@redhat.com)
*
* Please read Documentation/core-api/kobject.rst before using the kobject
* interface, ESPECIALLY the parts about reference counts and object
* destructors.
*/

#ifndef _LINUX_KOBJECT_NS_H
#define _LINUX_KOBJECT_NS_H

struct sock;
struct kobject;

/*
* Namespace types which are used to tag kobjects and sysfs entries.
* Network namespace will likely be the first.
*/
enum kobj_ns_type {
KOBJ_NS_TYPE_NONE = 0,
KOBJ_NS_TYPE_NET,
KOBJ_NS_TYPES
};

/*
* Callbacks so sysfs can determine namespaces
*   @grab_current_ns: return a new reference to calling task's namespace
*   @netlink_ns: return namespace to which a sock belongs (right?)
*   @initial_ns: return the initial namespace (i.e. init_net_ns)
*   @drop_ns: drops a reference to namespace
*/
struct kobj_ns_type_operations {
enum kobj_ns_type type;
bool (*current_may_mount)(void);
void *(*grab_current_ns)(void);
const void *(*netlink_ns)(struct sock *sk);
const void *(*initial_ns)(void);
void (*drop_ns)(void *);
};

int kobj_ns_type_register(const struct kobj_ns_type_operations *ops);
int kobj_ns_type_registered(enum kobj_ns_type type);
const struct kobj_ns_type_operations *kobj_child_ns_ops(const struct kobject *parent);
const struct kobj_ns_type_operations *kobj_ns_ops(const struct kobject *kobj);

bool kobj_ns_current_may_mount(enum kobj_ns_type type);
void *kobj_ns_grab_current(enum kobj_ns_type type);
void kobj_ns_drop(enum kobj_ns_type type, void *ns);

#endif /* _LINUX_KOBJECT_NS_H */

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