1 // SPDX-License-Identifier: GPL-2.0-only
11 static void ns_debug(struct ns_common *ns, const struct proc_ns_operations *ops)  in ns_debug()  argument
13 	switch (ns->ns_type) {  in ns_debug()
56 int __ns_common_init(struct ns_common *ns, u32 ns_type, const struct proc_ns_operations *ops, int i…  in __ns_common_init()  argument
60 	refcount_set(&ns->__ns_ref, 1);  in __ns_common_init()
61 	ns->stashed = NULL;  in __ns_common_init()
62 	ns->ops = ops;  in __ns_common_init()
63 	ns->ns_id = 0;  in __ns_common_init()
64 	ns->ns_type = ns_type;  in __ns_common_init()
65 	ns_tree_node_init(&ns->ns_tree_node);  in __ns_common_init()
66 	ns_tree_node_init(&ns->ns_unified_node);  in __ns_common_init()
67 	ns_tree_node_init(&ns->ns_owner_node);  in __ns_common_init()
68 	ns_tree_root_init(&ns->ns_owner_root);  in __ns_common_init()
71 	ns_debug(ns, ops);  in __ns_common_init()
75 		ns->inum = inum;  in __ns_common_init()
77 		ret = proc_alloc_inum(&ns->inum);  in __ns_common_init()
85 	if (is_ns_init_inum(ns))  in __ns_common_init()
86 		atomic_set(&ns->__ns_ref_active, 1);  in __ns_common_init()
88 		atomic_set(&ns->__ns_ref_active, 0);  in __ns_common_init()
92 void __ns_common_free(struct ns_common *ns)  in __ns_common_free()  argument
94 	proc_free_inum(ns->inum);  in __ns_common_free()
97 struct ns_common *__must_check ns_owner(struct ns_common *ns)  in ns_owner()  argument
101 	if (unlikely(!ns->ops))  in ns_owner()
103 	VFS_WARN_ON_ONCE(!ns->ops->owner);  in ns_owner()
104 	owner = ns->ops->owner(ns);  in ns_owner()
105 	VFS_WARN_ON_ONCE(!owner && ns != to_ns_common(&init_user_ns));  in ns_owner()
123  * - : dropping active reference
148  *                        -      -
153  *                        +   -   +
164 void __ns_ref_active_put(struct ns_common *ns)  in __ns_ref_active_put()  argument
167 	if (is_ns_init_id(ns))  in __ns_ref_active_put()
170 	if (!atomic_dec_and_test(&ns->__ns_ref_active)) {  in __ns_ref_active_put()
171 		VFS_WARN_ON_ONCE(__ns_ref_active_read(ns) < 0);  in __ns_ref_active_put()
175 	VFS_WARN_ON_ONCE(is_ns_init_id(ns));  in __ns_ref_active_put()
176 	VFS_WARN_ON_ONCE(!__ns_ref_read(ns));  in __ns_ref_active_put()
179 		ns = ns_owner(ns);  in __ns_ref_active_put()
180 		if (!ns)  in __ns_ref_active_put()
182 		VFS_WARN_ON_ONCE(is_ns_init_id(ns));  in __ns_ref_active_put()
183 		if (!atomic_dec_and_test(&ns->__ns_ref_active)) {  in __ns_ref_active_put()
184 			VFS_WARN_ON_ONCE(__ns_ref_active_read(ns) < 0);  in __ns_ref_active_put()
200  * - : dropping active reference
225  *                        -      -
230  *                        +   -   +
242  *                        -      -
247  *                        -   -   -
259  *                        +      -
264  *                        -   +   -
282 void __ns_ref_active_get(struct ns_common *ns)  in __ns_ref_active_get()  argument
287 	if (is_ns_init_id(ns))  in __ns_ref_active_get()
291 	prev = atomic_fetch_add(1, &ns->__ns_ref_active);  in __ns_ref_active_get()
301 		ns = ns_owner(ns);  in __ns_ref_active_get()
302 		if (!ns)  in __ns_ref_active_get()
305 		VFS_WARN_ON_ONCE(is_ns_init_id(ns));  in __ns_ref_active_get()
306 		prev = atomic_fetch_add(1, &ns->__ns_ref_active);  in __ns_ref_active_get()