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