forked from mirrors/linux
1adfcb03e3
makes procfs ->premission() instances safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
#ifndef _LINUX_PID_NS_H
|
|
#define _LINUX_PID_NS_H
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/kref.h>
|
|
|
|
struct pidmap {
|
|
atomic_t nr_free;
|
|
void *page;
|
|
};
|
|
|
|
#define BITS_PER_PAGE (PAGE_SIZE * 8)
|
|
#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
|
|
#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
|
|
|
|
struct bsd_acct_struct;
|
|
|
|
struct pid_namespace {
|
|
struct kref kref;
|
|
struct pidmap pidmap[PIDMAP_ENTRIES];
|
|
struct rcu_head rcu;
|
|
int last_pid;
|
|
unsigned int nr_hashed;
|
|
struct task_struct *child_reaper;
|
|
struct kmem_cache *pid_cachep;
|
|
unsigned int level;
|
|
struct pid_namespace *parent;
|
|
#ifdef CONFIG_PROC_FS
|
|
struct vfsmount *proc_mnt;
|
|
struct dentry *proc_self;
|
|
#endif
|
|
#ifdef CONFIG_BSD_PROCESS_ACCT
|
|
struct bsd_acct_struct *bacct;
|
|
#endif
|
|
struct user_namespace *user_ns;
|
|
struct work_struct proc_work;
|
|
kgid_t pid_gid;
|
|
int hide_pid;
|
|
int reboot; /* group exit code if this pidns was rebooted */
|
|
unsigned int proc_inum;
|
|
};
|
|
|
|
extern struct pid_namespace init_pid_ns;
|
|
|
|
#define PIDNS_HASH_ADDING (1U << 31)
|
|
|
|
#ifdef CONFIG_PID_NS
|
|
static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
|
|
{
|
|
if (ns != &init_pid_ns)
|
|
kref_get(&ns->kref);
|
|
return ns;
|
|
}
|
|
|
|
extern struct pid_namespace *copy_pid_ns(unsigned long flags,
|
|
struct user_namespace *user_ns, struct pid_namespace *ns);
|
|
extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
|
|
extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
|
|
extern void put_pid_ns(struct pid_namespace *ns);
|
|
|
|
#else /* !CONFIG_PID_NS */
|
|
#include <linux/err.h>
|
|
|
|
static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
|
|
{
|
|
return ns;
|
|
}
|
|
|
|
static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
|
|
struct user_namespace *user_ns, struct pid_namespace *ns)
|
|
{
|
|
if (flags & CLONE_NEWPID)
|
|
ns = ERR_PTR(-EINVAL);
|
|
return ns;
|
|
}
|
|
|
|
static inline void put_pid_ns(struct pid_namespace *ns)
|
|
{
|
|
}
|
|
|
|
static inline void zap_pid_ns_processes(struct pid_namespace *ns)
|
|
{
|
|
BUG();
|
|
}
|
|
|
|
static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PID_NS */
|
|
|
|
extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
|
|
void pidhash_init(void);
|
|
void pidmap_init(void);
|
|
|
|
#endif /* _LINUX_PID_NS_H */
|