Christian Brauner
5612ff3ec5
There's a lot of information that namespace implementers don't need to know about at all. Encapsulate this all in the initialization helper. Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>
84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_NS_COMMON_H
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#define _LINUX_NS_COMMON_H
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#include <linux/refcount.h>
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#include <linux/rbtree.h>
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struct proc_ns_operations;
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struct cgroup_namespace;
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struct ipc_namespace;
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struct mnt_namespace;
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struct net;
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struct pid_namespace;
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struct time_namespace;
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struct user_namespace;
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struct uts_namespace;
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extern struct cgroup_namespace init_cgroup_ns;
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extern struct ipc_namespace init_ipc_ns;
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extern struct mnt_namespace init_mnt_ns;
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extern struct net init_net;
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extern struct pid_namespace init_pid_ns;
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extern struct time_namespace init_time_ns;
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extern struct user_namespace init_user_ns;
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extern struct uts_namespace init_uts_ns;
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struct ns_common {
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struct dentry *stashed;
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const struct proc_ns_operations *ops;
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unsigned int inum;
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refcount_t count;
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union {
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struct {
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u64 ns_id;
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struct rb_node ns_tree_node;
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struct list_head ns_list_node;
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};
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struct rcu_head ns_rcu;
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};
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};
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int __ns_common_init(struct ns_common *ns, const struct proc_ns_operations *ops, int inum);
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#define to_ns_common(__ns) \
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_Generic((__ns), \
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struct cgroup_namespace *: &(__ns)->ns, \
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struct ipc_namespace *: &(__ns)->ns, \
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struct mnt_namespace *: &(__ns)->ns, \
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struct net *: &(__ns)->ns, \
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struct pid_namespace *: &(__ns)->ns, \
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struct time_namespace *: &(__ns)->ns, \
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struct user_namespace *: &(__ns)->ns, \
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struct uts_namespace *: &(__ns)->ns)
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#define ns_init_inum(__ns) \
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_Generic((__ns), \
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struct cgroup_namespace *: CGROUP_NS_INIT_INO, \
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struct ipc_namespace *: IPC_NS_INIT_INO, \
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struct mnt_namespace *: MNT_NS_INIT_INO, \
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struct net *: NET_NS_INIT_INO, \
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struct pid_namespace *: PID_NS_INIT_INO, \
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struct time_namespace *: TIME_NS_INIT_INO, \
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struct user_namespace *: USER_NS_INIT_INO, \
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struct uts_namespace *: UTS_NS_INIT_INO)
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#define ns_init_ns(__ns) \
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_Generic((__ns), \
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struct cgroup_namespace *: &init_cgroup_ns, \
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struct ipc_namespace *: &init_ipc_ns, \
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struct mnt_namespace *: &init_mnt_ns, \
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struct net *: &init_net, \
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struct pid_namespace *: &init_pid_ns, \
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struct time_namespace *: &init_time_ns, \
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struct user_namespace *: &init_user_ns, \
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struct uts_namespace *: &init_uts_ns)
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#define ns_common_init(__ns, __ops) \
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__ns_common_init(to_ns_common(__ns), __ops, (((__ns) == ns_init_ns(__ns)) ? ns_init_inum(__ns) : 0))
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#define ns_common_init_inum(__ns, __ops, __inum) __ns_common_init(to_ns_common(__ns), __ops, __inum)
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#endif
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