include/linux/proc_fs.h

   1 #ifndef _LINUX_PROC_FS_H
   2 #define _LINUX_PROC_FS_H
   3
   4 #include <linux/config.h>
   5 #include <linux/malloc.h>
   6
   7 /*
   8  * The proc filesystem constants/structures
   9  */
  10
  11 /*
  12  * Offset of the first process in the /proc root directory..
  13  */
  14 #define FIRST_PROCESS_ENTRY 256
  15
  16
  17 /*
  18  * We always define these enumerators
  19  */
  20
  21 enum {
  22         PROC_ROOT_INO = 1,
  23 };
  24
  25 /* Finally, the dynamically allocatable proc entries are reserved: */
  26
  27 #define PROC_DYNAMIC_FIRST 4096
  28 #define PROC_NDYNAMIC      4096
  29
  30 #define PROC_SUPER_MAGIC 0x9fa0
  31
  32 /*
  33  * This is not completely implemented yet. The idea is to
  34  * create an in-memory tree (like the actual /proc filesystem
  35  * tree) of these proc_dir_entries, so that we can dynamically
  36  * add new files to /proc.
  37  *
  38  * The "next" pointer creates a linked list of one /proc directory,
  39  * while parent/subdir create the directory structure (every
  40  * /proc file has a parent, but "subdir" is NULL for all
  41  * non-directory entries).
  42  *
  43  * "get_info" is called at "read", while "owner" is used to protect module
  44  * from unloading while proc_dir_entry is in use
  45  */
  46
  47 typedef int (read_proc_t)(char *page, char **start, off_t off,
  48                           int count, int *eof, void *data);
  49 typedef int (write_proc_t)(struct file *file, const char *buffer,
  50                            unsigned long count, void *data);
  51 typedef int (get_info_t)(char *, char **, off_t, int);
  52
  53 struct proc_dir_entry {
  54         unsigned short low_ino;
  55         unsigned short namelen;
  56         const char *name;
  57         mode_t mode;
  58         nlink_t nlink;
  59         uid_t uid;
  60         gid_t gid;
  61         unsigned long size;
  62         struct inode_operations * proc_iops;
  63         struct file_operations * proc_fops;
  64         get_info_t *get_info;
  65         struct module *owner;
  66         struct proc_dir_entry *next, *parent, *subdir;
  67         void *data;
  68         read_proc_t *read_proc;
  69         write_proc_t *write_proc;
  70         atomic_t count;         /* use count */
  71         int deleted;            /* delete flag */
  72         kdev_t  rdev;
  73 };
  74
  75 #define PROC_INODE_PROPER(inode) ((inode)->i_ino & ~0xffff)
  76
  77 #ifdef CONFIG_PROC_FS
  78
  79 extern struct proc_dir_entry proc_root;
  80 extern struct proc_dir_entry *proc_root_fs;
  81 extern struct proc_dir_entry *proc_net;
  82 extern struct proc_dir_entry *proc_bus;
  83 extern struct proc_dir_entry *proc_root_driver;
  84 extern struct proc_dir_entry *proc_root_kcore;
  85
  86 extern void proc_root_init(void);
  87 extern void proc_misc_init(void);
  88
  89 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry);
  90 void proc_pid_delete_inode(struct inode *inode);
  91 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
  92
  93 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
  94                                                 struct proc_dir_entry *parent);
  95 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
  96
  97 extern struct vfsmount *proc_mnt;
  98 extern struct super_block *proc_read_super(struct super_block *,void *,int);
  99 extern struct inode * proc_get_inode(struct super_block *, int, struct proc_dir_entry *);
 100
 101 extern int proc_match(int, const char *,struct proc_dir_entry *);
 102
 103 /*
 104  * These are generic /proc routines that use the internal
 105  * "struct proc_dir_entry" tree to traverse the filesystem.
 106  *
 107  * The /proc root directory has extended versions to take care
 108  * of the /proc/<pid> subdirectories.
 109  */
 110 extern int proc_readdir(struct file *, void *, filldir_t);
 111 extern struct dentry *proc_lookup(struct inode *, struct dentry *);
 112
 113 extern struct file_operations proc_kcore_operations;
 114 extern struct file_operations proc_kmsg_operations;
 115 extern struct file_operations ppc_htab_operations;
 116
 117 /*
 118  * proc_tty.c
 119  */
 120 extern void proc_tty_init(void);
 121 extern void proc_tty_register_driver(struct tty_driver *driver);
 122 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 123
 124 /*
 125  * proc_devtree.c
 126  */
 127 extern void proc_device_tree_init(void);
 128
 129 extern struct proc_dir_entry *proc_symlink(const char *,
 130                 struct proc_dir_entry *, const char *);
 131 extern struct proc_dir_entry *proc_mknod(const char *,mode_t,
 132                 struct proc_dir_entry *,kdev_t);
 133 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 134
 135 extern inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 136         mode_t mode, struct proc_dir_entry *base,
 137         read_proc_t *read_proc, void * data)
 138 {
 139         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 140         if (res) {
 141                 res->read_proc=read_proc;
 142                 res->data=data;
 143         }
 144         return res;
 145 }
 146
 147 extern inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 148         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 149 {
 150         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 151         if (res) res->get_info=get_info;
 152         return res;
 153 }
 154
 155 extern inline struct proc_dir_entry *proc_net_create(const char *name,
 156         mode_t mode, get_info_t *get_info)
 157 {
 158         return create_proc_info_entry(name,mode,proc_net,get_info);
 159 }
 160
 161 extern inline void proc_net_remove(const char *name)
 162 {
 163         remove_proc_entry(name,proc_net);
 164 }
 165
 166 #else
 167
 168 extern inline struct proc_dir_entry *proc_net_create(const char *name, mode_t mode,
 169         get_info_t *get_info) {return NULL;}
 170 extern inline void proc_net_remove(const char *name) {}
 171
 172 extern inline struct proc_dir_entry *create_proc_entry(const char *name,
 173         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 174
 175 extern inline void remove_proc_entry(const char *name, struct proc_dir_entry *parent) {};
 176 extern inline struct proc_dir_entry *proc_symlink(const char *name,
 177                 struct proc_dir_entry *parent,char *dest) {return NULL;}
 178 extern inline struct proc_dir_entry *proc_mknod(const char *name,mode_t mode,
 179                 struct proc_dir_entry *parent,kdev_t rdev) {return NULL;}
 180 extern inline struct proc_dir_entry *proc_mkdir(const char *name,
 181         struct proc_dir_entry *parent) {return NULL;}
 182
 183 extern inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 184         mode_t mode, struct proc_dir_entry *base,
 185         int (*read_proc)(char *, char **, off_t, int, int *, void *),
 186         void * data) { return NULL; }
 187 extern inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 188         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 189         { return NULL; }
 190
 191 extern inline void proc_tty_register_driver(struct tty_driver *driver) {};
 192 extern inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 193
 194 extern struct proc_dir_entry proc_root;
 195
 196 #endif /* CONFIG_PROC_FS */
 197
 198 #endif /* _LINUX_PROC_FS_H */