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- #ifndef _LINUX_NSPROXY_H
- #define _LINUX_NSPROXY_H
- #include <linux/spinlock.h>
- #include <linux/sched.h>
- struct mnt_namespace;
- struct uts_namespace;
- struct ipc_namespace;
- struct pid_namespace;
- /*
- * A structure to contain pointers to all per-process
- * namespaces - fs (mount), uts, network, sysvipc, etc.
- *
- * 'count' is the number of tasks holding a reference.
- * The count for each namespace, then, will be the number
- * of nsproxies pointing to it, not the number of tasks.
- *
- * The nsproxy is shared by tasks which share all namespaces.
- * As soon as a single namespace is cloned or unshared, the
- * nsproxy is copied.
- */
- struct nsproxy {
- atomic_t count;
- spinlock_t nslock;
- struct uts_namespace *uts_ns;
- struct ipc_namespace *ipc_ns;
- struct mnt_namespace *mnt_ns;
- struct pid_namespace *pid_ns;
- };
- extern struct nsproxy init_nsproxy;
- struct nsproxy *dup_namespaces(struct nsproxy *orig);
- int copy_namespaces(int flags, struct task_struct *tsk);
- void get_task_namespaces(struct task_struct *tsk);
- void free_nsproxy(struct nsproxy *ns);
- static inline void put_nsproxy(struct nsproxy *ns)
- {
- if (atomic_dec_and_test(&ns->count)) {
- free_nsproxy(ns);
- }
- }
- static inline void exit_task_namespaces(struct task_struct *p)
- {
- struct nsproxy *ns = p->nsproxy;
- if (ns) {
- task_lock(p);
- p->nsproxy = NULL;
- task_unlock(p);
- put_nsproxy(ns);
- }
- }
- #endif
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