From: Christian Brauner Date: Fri, 12 Sep 2025 11:52:50 +0000 (+0200) Subject: nsfs: add current_in_namespace() X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d2afdb73f8ad77b49eca9d110d0c54bf30d1df0f;p=thirdparty%2Fkernel%2Fstable.git nsfs: add current_in_namespace() Add a helper to easily check whether a given namespace is the caller's current namespace. This is currently open-coded in a lot of places. Simply switch on the type and compare the results. Reviewed-by: Aleksa Sarai Signed-off-by: Christian Brauner --- diff --git a/include/linux/nsfs.h b/include/linux/nsfs.h index fb84aa538091f..e5a5fa83d36bd 100644 --- a/include/linux/nsfs.h +++ b/include/linux/nsfs.h @@ -5,6 +5,8 @@ #define _LINUX_NSFS_H #include +#include +#include struct path; struct task_struct; @@ -22,5 +24,17 @@ int ns_get_name(char *buf, size_t size, struct task_struct *task, const struct proc_ns_operations *ns_ops); void nsfs_init(void); -#endif /* _LINUX_NSFS_H */ +#define __current_namespace_from_type(__ns) \ + _Generic((__ns), \ + struct cgroup_namespace *: current->nsproxy->cgroup_ns, \ + struct ipc_namespace *: current->nsproxy->ipc_ns, \ + struct net *: current->nsproxy->net_ns, \ + struct pid_namespace *: task_active_pid_ns(current), \ + struct mnt_namespace *: current->nsproxy->mnt_ns, \ + struct time_namespace *: current->nsproxy->time_ns, \ + struct user_namespace *: current_user_ns(), \ + struct uts_namespace *: current->nsproxy->uts_ns) + +#define current_in_namespace(__ns) (__current_namespace_from_type(__ns) == __ns) +#endif /* _LINUX_NSFS_H */