include/linux/proc_fs.h

   1 #ifndef _LINUX_PROC_FS_H
   2 #define _LINUX_PROC_FS_H
   3
   4 #include <linux/slab.h>
   5 #include <linux/fs.h>
   6 #include <linux/spinlock.h>
   7 #include <asm/atomic.h>
   8
   9 /*
  10  * The proc filesystem constants/structures
  11  */
  12
  13 /*
  14  * Offset of the first process in the /proc root directory..
  15  */
  16 #define FIRST_PROCESS_ENTRY 256
  17
  18
  19 /*
  20  * We always define these enumerators
  21  */
  22
  23 enum {
  24         PROC_ROOT_INO = 1,
  25 };
  26
  27 #define PROC_SUPER_MAGIC 0x9fa0
  28
  29 /*
  30  * This is not completely implemented yet. The idea is to
  31  * create an in-memory tree (like the actual /proc filesystem
  32  * tree) of these proc_dir_entries, so that we can dynamically
  33  * add new files to /proc.
  34  *
  35  * The "next" pointer creates a linked list of one /proc directory,
  36  * while parent/subdir create the directory structure (every
  37  * /proc file has a parent, but "subdir" is NULL for all
  38  * non-directory entries).
  39  *
  40  * "get_info" is called at "read", while "owner" is used to protect module
  41  * from unloading while proc_dir_entry is in use
  42  */
  43
  44 typedef int (read_proc_t)(char *page, char **start, off_t off,
  45                           int count, int *eof, void *data);
  46 typedef int (write_proc_t)(struct file *file, const char __user *buffer,
  47                            unsigned long count, void *data);
  48 typedef int (get_info_t)(char *, char **, off_t, int);
  49
  50 struct proc_dir_entry {
  51         unsigned int low_ino;
  52         unsigned short namelen;
  53         const char *name;
  54         mode_t mode;
  55         nlink_t nlink;
  56         uid_t uid;
  57         gid_t gid;
  58         loff_t size;
  59         struct inode_operations * proc_iops;
  60         const struct file_operations * proc_fops;
  61         get_info_t *get_info;
  62         struct module *owner;
  63         struct proc_dir_entry *next, *parent, *subdir;
  64         void *data;
  65         read_proc_t *read_proc;
  66         write_proc_t *write_proc;
  67         atomic_t count;         /* use count */
  68         int deleted;            /* delete flag */
  69         void *set;
  70 };
  71
  72 struct kcore_list {
  73         struct kcore_list *next;
  74         unsigned long addr;
  75         size_t size;
  76 };
  77
  78 struct vmcore {
  79         struct list_head list;
  80         unsigned long long paddr;
  81         unsigned long long size;
  82         loff_t offset;
  83 };
  84
  85 #ifdef CONFIG_PROC_FS
  86
  87 extern struct proc_dir_entry proc_root;
  88 extern struct proc_dir_entry *proc_root_fs;
  89 extern struct proc_dir_entry *proc_net;
  90 extern struct proc_dir_entry *proc_net_stat;
  91 extern struct proc_dir_entry *proc_bus;
  92 extern struct proc_dir_entry *proc_root_driver;
  93 extern struct proc_dir_entry *proc_root_kcore;
  94
  95 extern spinlock_t proc_subdir_lock;
  96
  97 extern void proc_root_init(void);
  98 extern void proc_misc_init(void);
  99
 100 struct mm_struct;
 101
 102 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
 103 struct dentry *proc_pid_unhash(struct task_struct *p);
 104 void proc_pid_flush(struct dentry *proc_dentry);
 105 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 106 unsigned long task_vsize(struct mm_struct *);
 107 int task_statm(struct mm_struct *, int *, int *, int *, int *);
 108 char *task_mem(struct mm_struct *, char *);
 109
 110 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 111                                                 struct proc_dir_entry *parent);
 112 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 113
 114 extern struct vfsmount *proc_mnt;
 115 extern int proc_fill_super(struct super_block *,void *,int);
 116 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
 117
 118 extern int proc_match(int, const char *,struct proc_dir_entry *);
 119
 120 /*
 121  * These are generic /proc routines that use the internal
 122  * "struct proc_dir_entry" tree to traverse the filesystem.
 123  *
 124  * The /proc root directory has extended versions to take care
 125  * of the /proc/<pid> subdirectories.
 126  */
 127 extern int proc_readdir(struct file *, void *, filldir_t);
 128 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
 129
 130 extern const struct file_operations proc_kcore_operations;
 131 extern const struct file_operations proc_kmsg_operations;
 132 extern const struct file_operations ppc_htab_operations;
 133
 134 /*
 135  * proc_tty.c
 136  */
 137 struct tty_driver;
 138 extern void proc_tty_init(void);
 139 extern void proc_tty_register_driver(struct tty_driver *driver);
 140 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 141
 142 /*
 143  * proc_devtree.c
 144  */
 145 #ifdef CONFIG_PROC_DEVICETREE
 146 struct device_node;
 147 struct property;
 148 extern void proc_device_tree_init(void);
 149 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 150 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 151 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 152                                          struct property *prop);
 153 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 154                                          struct property *newprop,
 155                                          struct property *oldprop);
 156 #endif /* CONFIG_PROC_DEVICETREE */
 157
 158 extern struct proc_dir_entry *proc_symlink(const char *,
 159                 struct proc_dir_entry *, const char *);
 160 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 161 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 162                         struct proc_dir_entry *parent);
 163
 164 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 165         mode_t mode, struct proc_dir_entry *base,
 166         read_proc_t *read_proc, void * data)
 167 {
 168         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 169         if (res) {
 170                 res->read_proc=read_proc;
 171                 res->data=data;
 172         }
 173         return res;
 174 }
 175
 176 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 177         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 178 {
 179         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 180         if (res) res->get_info=get_info;
 181         return res;
 182 }
 183
 184 static inline struct proc_dir_entry *proc_net_create(const char *name,
 185         mode_t mode, get_info_t *get_info)
 186 {
 187         return create_proc_info_entry(name,mode,proc_net,get_info);
 188 }
 189
 190 static inline struct proc_dir_entry *proc_net_fops_create(const char *name,
 191         mode_t mode, const struct file_operations *fops)
 192 {
 193         struct proc_dir_entry *res = create_proc_entry(name, mode, proc_net);
 194         if (res)
 195                 res->proc_fops = fops;
 196         return res;
 197 }
 198
 199 static inline void proc_net_remove(const char *name)
 200 {
 201         remove_proc_entry(name,proc_net);
 202 }
 203
 204 #else
 205
 206 #define proc_root_driver NULL
 207 #define proc_net NULL
 208 #define proc_bus NULL
 209
 210 #define proc_net_fops_create(name, mode, fops)  ({ (void)(mode), NULL; })
 211 #define proc_net_create(name, mode, info)       ({ (void)(mode), NULL; })
 212 static inline void proc_net_remove(const char *name) {}
 213
 214 static inline struct dentry *proc_pid_unhash(struct task_struct *p) { return NULL; }
 215 static inline void proc_pid_flush(struct dentry *proc_dentry) { }
 216
 217 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 218         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 219
 220 #define remove_proc_entry(name, parent) do {} while (0)
 221
 222 static inline struct proc_dir_entry *proc_symlink(const char *name,
 223                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 224 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 225         struct proc_dir_entry *parent) {return NULL;}
 226
 227 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 228         mode_t mode, struct proc_dir_entry *base,
 229         read_proc_t *read_proc, void * data) { return NULL; }
 230 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 231         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 232         { return NULL; }
 233
 234 struct tty_driver;
 235 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 236 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 237
 238 extern struct proc_dir_entry proc_root;
 239
 240 #endif /* CONFIG_PROC_FS */
 241
 242 #if !defined(CONFIG_PROC_KCORE)
 243 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
 244 {
 245 }
 246 #else
 247 extern void kclist_add(struct kcore_list *, void *, size_t);
 248 #endif
 249
 250 struct proc_inode {
 251         struct task_struct *task;
 252         int type;
 253         union {
 254                 int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
 255                 int (*proc_read)(struct task_struct *task, char *page);
 256         } op;
 257         struct proc_dir_entry *pde;
 258         struct inode vfs_inode;
 259 };
 260
 261 static inline struct proc_inode *PROC_I(const struct inode *inode)
 262 {
 263         return container_of(inode, struct proc_inode, vfs_inode);
 264 }
 265
 266 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 267 {
 268         return PROC_I(inode)->pde;
 269 }
 270
 271 #endif /* _LINUX_PROC_FS_H */