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nsproxy: add helper to go from arbitrary namespace to ns_common

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They all contains struct ns_common ns and if there ever is one where
that isn't the case we'll catch it here at build time.

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-06-28 10:05:19 +02:00
parent d057c10815
commit 85e4daaeb7
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1 changed files with 11 additions and 0 deletions
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11
include/linux/nsproxy.h
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@ -42,6 +42,17 @@ struct nsproxy {
};
extern struct nsproxy init_nsproxy;
#define to_ns_common(__ns) \
_Generic((__ns), \
struct cgroup_namespace *: &(__ns->ns), \
struct ipc_namespace *: &(__ns->ns), \
struct net *: &(__ns->ns), \
struct pid_namespace *: &(__ns->ns), \
struct mnt_namespace *: &(__ns->ns), \
struct time_namespace *: &(__ns->ns), \
struct user_namespace *: &(__ns->ns), \
struct uts_namespace *: &(__ns->ns))
/*
* A structure to encompass all bits needed to install
* a partial or complete new set of namespaces.