LXR linux/include/linux/proc

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * The proc filesystem constants/structures
   4 */
   5#ifndef _LINUX_PROC_FS_H
   6#define _LINUX_PROC_FS_H
   7
   8#include <linux/types.h>
   9#include <linux/fs.h>
  10
  11struct proc_dir_entry;
  12struct seq_file;
  13struct seq_operations;
  14
  15#ifdef CONFIG_PROC_FS
  16
  17typedef int (*proc_write_t)(struct file *, char *, size_t);
  18
  19extern void proc_root_init(void);
  20extern void proc_flush_task(struct task_struct *);
  21
  22extern struct proc_dir_entry *proc_symlink(const char *,
  23                struct proc_dir_entry *, const char *);
  24extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *);
  25extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
  26                                              struct proc_dir_entry *, void *);
  27extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
  28                                              struct proc_dir_entry *);
  29struct proc_dir_entry *proc_create_mount_point(const char *name);
  30
  31struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
  32                struct proc_dir_entry *parent, const struct seq_operations *ops,
  33                unsigned int state_size, void *data);
  34#define proc_create_seq_data(name, mode, parent, ops, data) \
  35        proc_create_seq_private(name, mode, parent, ops, 0, data)
  36#define proc_create_seq(name, mode, parent, ops) \
  37        proc_create_seq_private(name, mode, parent, ops, 0, NULL)
  38struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
  39                struct proc_dir_entry *parent,
  40                int (*show)(struct seq_file *, void *), void *data);
  41#define proc_create_single(name, mode, parent, show) \
  42        proc_create_single_data(name, mode, parent, show, NULL)
  43 
  44extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
  45                                               struct proc_dir_entry *,
  46                                               const struct file_operations *,
  47                                               void *);
  48
  49struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct file_operations *proc_fops);
  50extern void proc_set_size(struct proc_dir_entry *, loff_t);
  51extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
  52extern void *PDE_DATA(const struct inode *);
  53extern void *proc_get_parent_data(const struct inode *);
  54extern void proc_remove(struct proc_dir_entry *);
  55extern void remove_proc_entry(const char *, struct proc_dir_entry *);
  56extern int remove_proc_subtree(const char *, struct proc_dir_entry *);
  57
  58struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
  59                struct proc_dir_entry *parent, const struct seq_operations *ops,
  60                unsigned int state_size, void *data);
  61#define proc_create_net(name, mode, parent, ops, state_size) \
  62        proc_create_net_data(name, mode, parent, ops, state_size, NULL)
  63struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
  64                struct proc_dir_entry *parent,
  65                int (*show)(struct seq_file *, void *), void *data);
  66struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
  67                                                  struct proc_dir_entry *parent,
  68                                                  const struct seq_operations *ops,
  69                                                  proc_write_t write,
  70                                                  unsigned int state_size, void *data);
  71struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
  72                                                    struct proc_dir_entry *parent,
  73                                                    int (*show)(struct seq_file *, void *),
  74                                                    proc_write_t write,
  75                                                    void *data);
  76extern struct pid *tgid_pidfd_to_pid(const struct file *file);
  77
  78#ifdef CONFIG_PROC_PID_ARCH_STATUS
  79/*
  80 * The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
  81 * provide proc_pid_arch_status() definition.
  82 */
  83int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns,
  84                        struct pid *pid, struct task_struct *task);
  85#endif /* CONFIG_PROC_PID_ARCH_STATUS */
  86
  87#else /* CONFIG_PROC_FS */
  88
  89static inline void proc_root_init(void)
  90{
  91}
  92
  93static inline void proc_flush_task(struct task_struct *task)
  94{
  95}
  96
  97static inline struct proc_dir_entry *proc_symlink(const char *name,
  98                struct proc_dir_entry *parent,const char *dest) { return NULL;}
  99static inline struct proc_dir_entry *proc_mkdir(const char *name,
 100        struct proc_dir_entry *parent) {return NULL;}
 101static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; }
 102static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
 103        umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
 104static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
 105        umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 106#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
 107#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
 108#define proc_create_seq(name, mode, parent, ops) ({NULL;})
 109#define proc_create_single(name, mode, parent, show) ({NULL;})
 110#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
 111#define proc_create(name, mode, parent, proc_fops) ({NULL;})
 112#define proc_create_data(name, mode, parent, proc_fops, data) ({NULL;})
 113
 114static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
 115static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
 116static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
 117static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }
 118
 119static inline void proc_remove(struct proc_dir_entry *de) {}
 120#define remove_proc_entry(name, parent) do {} while (0)
 121static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; }
 122
 123#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
 124#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
 125#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
 126
 127static inline struct pid *tgid_pidfd_to_pid(const struct file *file)
 128{
 129        return ERR_PTR(-EBADF);
 130}
 131
 132#endif /* CONFIG_PROC_FS */
 133
 134struct net;
 135
 136static inline struct proc_dir_entry *proc_net_mkdir(
 137        struct net *net, const char *name, struct proc_dir_entry *parent)
 138{
 139        return proc_mkdir_data(name, 0, parent, net);
 140}
 141
 142struct ns_common;
 143int open_related_ns(struct ns_common *ns,
 144                   struct ns_common *(*get_ns)(struct ns_common *ns));
 145
 146/* get the associated pid namespace for a file in procfs */
 147static inline struct pid_namespace *proc_pid_ns(const struct inode *inode)
 148{
 149        return inode->i_sb->s_fs_info;
 150}
 151
 152#endif /* _LINUX_PROC_FS_H */
 153