LXR linux/include/linux/proc

   1/*
   2 * procfs namespace bits
   3 */
   4#ifndef _LINUX_PROC_NS_H
   5#define _LINUX_PROC_NS_H
   6
   7#include <linux/ns_common.h>
   8
   9struct pid_namespace;
  10struct nsproxy;
  11struct path;
  12struct task_struct;
  13struct inode;
  14
  15struct proc_ns_operations {
  16        const char *name;
  17        int type;
  18        struct ns_common *(*get)(struct task_struct *task);
  19        void (*put)(struct ns_common *ns);
  20        int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
  21};
  22
  23extern const struct proc_ns_operations netns_operations;
  24extern const struct proc_ns_operations utsns_operations;
  25extern const struct proc_ns_operations ipcns_operations;
  26extern const struct proc_ns_operations pidns_operations;
  27extern const struct proc_ns_operations userns_operations;
  28extern const struct proc_ns_operations mntns_operations;
  29extern const struct proc_ns_operations cgroupns_operations;
  30
  31/*
  32 * We always define these enumerators
  33 */
  34enum {
  35        PROC_ROOT_INO           = 1,
  36        PROC_IPC_INIT_INO       = 0xEFFFFFFFU,
  37        PROC_UTS_INIT_INO       = 0xEFFFFFFEU,
  38        PROC_USER_INIT_INO      = 0xEFFFFFFDU,
  39        PROC_PID_INIT_INO       = 0xEFFFFFFCU,
  40        PROC_CGROUP_INIT_INO    = 0xEFFFFFFBU,
  41};
  42
  43#ifdef CONFIG_PROC_FS
  44
  45extern int pid_ns_prepare_proc(struct pid_namespace *ns);
  46extern void pid_ns_release_proc(struct pid_namespace *ns);
  47extern int proc_alloc_inum(unsigned int *pino);
  48extern void proc_free_inum(unsigned int inum);
  49
  50#else /* CONFIG_PROC_FS */
  51
  52static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
  53static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
  54
  55static inline int proc_alloc_inum(unsigned int *inum)
  56{
  57        *inum = 1;
  58        return 0;
  59}
  60static inline void proc_free_inum(unsigned int inum) {}
  61
  62#endif /* CONFIG_PROC_FS */
  63
  64static inline int ns_alloc_inum(struct ns_common *ns)
  65{
  66        atomic_long_set(&ns->stashed, 0);
  67        return proc_alloc_inum(&ns->inum);
  68}
  69
  70#define ns_free_inum(ns) proc_free_inum((ns)->inum)
  71
  72extern struct file *proc_ns_fget(int fd);
  73#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
  74extern void *ns_get_path(struct path *path, struct task_struct *task,
  75                        const struct proc_ns_operations *ns_ops);
  76
  77extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
  78                        const struct proc_ns_operations *ns_ops);
  79extern void nsfs_init(void);
  80
  81#endif /* _LINUX_PROC_NS_H */
  82