1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/ns_common.h>
4 #include <linux/proc_ns.h>
5 #include <linux/vfsdebug.h>
6
7 #ifdef CONFIG_DEBUG_VFS
ns_debug(struct ns_common * ns,const struct proc_ns_operations * ops)8 static void ns_debug(struct ns_common *ns, const struct proc_ns_operations *ops)
9 {
10 switch (ns->ns_type) {
11 #ifdef CONFIG_CGROUPS
12 case CLONE_NEWCGROUP:
13 VFS_WARN_ON_ONCE(ops != &cgroupns_operations);
14 break;
15 #endif
16 #ifdef CONFIG_IPC_NS
17 case CLONE_NEWIPC:
18 VFS_WARN_ON_ONCE(ops != &ipcns_operations);
19 break;
20 #endif
21 case CLONE_NEWNS:
22 VFS_WARN_ON_ONCE(ops != &mntns_operations);
23 break;
24 #ifdef CONFIG_NET_NS
25 case CLONE_NEWNET:
26 VFS_WARN_ON_ONCE(ops != &netns_operations);
27 break;
28 #endif
29 #ifdef CONFIG_PID_NS
30 case CLONE_NEWPID:
31 VFS_WARN_ON_ONCE(ops != &pidns_operations);
32 break;
33 #endif
34 #ifdef CONFIG_TIME_NS
35 case CLONE_NEWTIME:
36 VFS_WARN_ON_ONCE(ops != &timens_operations);
37 break;
38 #endif
39 #ifdef CONFIG_USER_NS
40 case CLONE_NEWUSER:
41 VFS_WARN_ON_ONCE(ops != &userns_operations);
42 break;
43 #endif
44 #ifdef CONFIG_UTS_NS
45 case CLONE_NEWUTS:
46 VFS_WARN_ON_ONCE(ops != &utsns_operations);
47 break;
48 #endif
49 }
50 }
51 #endif
52
__ns_common_init(struct ns_common * ns,u32 ns_type,const struct proc_ns_operations * ops,int inum)53 int __ns_common_init(struct ns_common *ns, u32 ns_type, const struct proc_ns_operations *ops, int inum)
54 {
55 refcount_set(&ns->__ns_ref, 1);
56 ns->stashed = NULL;
57 ns->ops = ops;
58 ns->ns_id = 0;
59 ns->ns_type = ns_type;
60 RB_CLEAR_NODE(&ns->ns_tree_node);
61 INIT_LIST_HEAD(&ns->ns_list_node);
62
63 #ifdef CONFIG_DEBUG_VFS
64 ns_debug(ns, ops);
65 #endif
66
67 if (inum) {
68 ns->inum = inum;
69 return 0;
70 }
71 return proc_alloc_inum(&ns->inum);
72 }
73
__ns_common_free(struct ns_common * ns)74 void __ns_common_free(struct ns_common *ns)
75 {
76 proc_free_inum(ns->inum);
77 }
78