diff options
Diffstat (limited to 'kernel/nscommon.c')
| -rw-r--r-- | kernel/nscommon.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/kernel/nscommon.c b/kernel/nscommon.c new file mode 100644 index 000000000000..c1fb2bad6d72 --- /dev/null +++ b/kernel/nscommon.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/ns_common.h> +#include <linux/proc_ns.h> +#include <linux/vfsdebug.h> + +#ifdef CONFIG_DEBUG_VFS +static void ns_debug(struct ns_common *ns, const struct proc_ns_operations *ops) +{ + switch (ns->ns_type) { +#ifdef CONFIG_CGROUPS + case CLONE_NEWCGROUP: + VFS_WARN_ON_ONCE(ops != &cgroupns_operations); + break; +#endif +#ifdef CONFIG_IPC_NS + case CLONE_NEWIPC: + VFS_WARN_ON_ONCE(ops != &ipcns_operations); + break; +#endif + case CLONE_NEWNS: + VFS_WARN_ON_ONCE(ops != &mntns_operations); + break; +#ifdef CONFIG_NET_NS + case CLONE_NEWNET: + VFS_WARN_ON_ONCE(ops != &netns_operations); + break; +#endif +#ifdef CONFIG_PID_NS + case CLONE_NEWPID: + VFS_WARN_ON_ONCE(ops != &pidns_operations); + break; +#endif +#ifdef CONFIG_TIME_NS + case CLONE_NEWTIME: + VFS_WARN_ON_ONCE(ops != &timens_operations); + break; +#endif +#ifdef CONFIG_USER_NS + case CLONE_NEWUSER: + VFS_WARN_ON_ONCE(ops != &userns_operations); + break; +#endif +#ifdef CONFIG_UTS_NS + case CLONE_NEWUTS: + VFS_WARN_ON_ONCE(ops != &utsns_operations); + break; +#endif + } +} +#endif + +int __ns_common_init(struct ns_common *ns, u32 ns_type, const struct proc_ns_operations *ops, int inum) +{ + refcount_set(&ns->__ns_ref, 1); + ns->stashed = NULL; + ns->ops = ops; + ns->ns_id = 0; + ns->ns_type = ns_type; + RB_CLEAR_NODE(&ns->ns_tree_node); + INIT_LIST_HEAD(&ns->ns_list_node); + +#ifdef CONFIG_DEBUG_VFS + ns_debug(ns, ops); +#endif + + if (inum) { + ns->inum = inum; + return 0; + } + return proc_alloc_inum(&ns->inum); +} + +void __ns_common_free(struct ns_common *ns) +{ + proc_free_inum(ns->inum); +} |