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 <linux/magic.h>
   8 #include <asm/atomic.h>
   9
  10 struct net;
  11 struct completion;
  12
  13 /*
  14  * The proc filesystem constants/structures
  15  */
  16
  17 /*
  18  * Offset of the first process in the /proc root directory..
  19  */
  20 #define FIRST_PROCESS_ENTRY 256
  21
  22
  23 /*
  24  * We always define these enumerators
  25  */
  26
  27 enum {
  28         PROC_ROOT_INO = 1,
  29 };
  30
  31 /*
  32  * This is not completely implemented yet. The idea is to
  33  * create an in-memory tree (like the actual /proc filesystem
  34  * tree) of these proc_dir_entries, so that we can dynamically
  35  * add new files to /proc.
  36  *
  37  * The "next" pointer creates a linked list of one /proc directory,
  38  * while parent/subdir create the directory structure (every
  39  * /proc file has a parent, but "subdir" is NULL for all
  40  * non-directory entries).
  41  *
  42  * "get_info" is called at "read", while "owner" is used to protect module
  43  * from unloading while proc_dir_entry is in use
  44  */
  45
  46 typedef int (read_proc_t)(char *page, char **start, off_t off,
  47                           int count, int *eof, void *data);
  48 typedef int (write_proc_t)(struct file *file, const char __user *buffer,
  49                            unsigned long count, void *data);
  50 typedef int (get_info_t)(char *, char **, off_t, int);
  51 typedef struct proc_dir_entry *(shadow_proc_t)(struct task_struct *task,
  52                                                 struct proc_dir_entry *pde);
  53
  54 struct proc_dir_entry {
  55         unsigned int low_ino;
  56         unsigned short namelen;
  57         const char *name;
  58         mode_t mode;
  59         nlink_t nlink;
  60         uid_t uid;
  61         gid_t gid;
  62         loff_t size;
  63         const struct inode_operations *proc_iops;
  64         /*
  65          * NULL ->proc_fops means "PDE is going away RSN" or
  66          * "PDE is just created". In either case, e.g. ->read_proc won't be
  67          * called because it's too late or too early, respectively.
  68          *
  69          * If you're allocating ->proc_fops dynamically, save a pointer
  70          * somewhere.
  71          */
  72         const struct file_operations *proc_fops;
  73         get_info_t *get_info;
  74         struct module *owner;
  75         struct proc_dir_entry *next, *parent, *subdir;
  76         void *data;
  77         read_proc_t *read_proc;
  78         write_proc_t *write_proc;
  79         atomic_t count;         /* use count */
  80         int deleted;            /* delete flag */
  81         int pde_users;  /* number of callers into module in progress */
  82         spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
  83         struct completion *pde_unload_completion;
  84         shadow_proc_t *shadow_proc;
  85 };
  86
  87 struct kcore_list {
  88         struct kcore_list *next;
  89         unsigned long addr;
  90         size_t size;
  91 };
  92
  93 struct vmcore {
  94         struct list_head list;
  95         unsigned long long paddr;
  96         unsigned long long size;
  97         loff_t offset;
  98 };
  99
 100 #ifdef CONFIG_PROC_FS
 101
 102 extern struct proc_dir_entry proc_root;
 103 extern struct proc_dir_entry *proc_root_fs;
 104 extern struct proc_dir_entry *proc_bus;
 105 extern struct proc_dir_entry *proc_root_driver;
 106 extern struct proc_dir_entry *proc_root_kcore;
 107
 108 extern spinlock_t proc_subdir_lock;
 109
 110 extern void proc_root_init(void);
 111 extern void proc_misc_init(void);
 112
 113 struct mm_struct;
 114
 115 void proc_flush_task(struct task_struct *task);
 116 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
 117 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 118 unsigned long task_vsize(struct mm_struct *);
 119 int task_statm(struct mm_struct *, int *, int *, int *, int *);
 120 char *task_mem(struct mm_struct *, char *);
 121 void clear_refs_smap(struct mm_struct *mm);
 122
 123 struct proc_dir_entry *de_get(struct proc_dir_entry *de);
 124 void de_put(struct proc_dir_entry *de);
 125
 126 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 127                                                 struct proc_dir_entry *parent);
 128 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 129
 130 extern struct vfsmount *proc_mnt;
 131 struct pid_namespace;
 132 extern int proc_fill_super(struct super_block *);
 133 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
 134
 135 /*
 136  * These are generic /proc routines that use the internal
 137  * "struct proc_dir_entry" tree to traverse the filesystem.
 138  *
 139  * The /proc root directory has extended versions to take care
 140  * of the /proc/<pid> subdirectories.
 141  */
 142 extern int proc_readdir(struct file *, void *, filldir_t);
 143 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
 144
 145 extern const struct file_operations proc_kcore_operations;
 146 extern const struct file_operations proc_kmsg_operations;
 147 extern const struct file_operations ppc_htab_operations;
 148
 149 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 150 extern void pid_ns_release_proc(struct pid_namespace *ns);
 151
 152 /*
 153  * proc_tty.c
 154  */
 155 struct tty_driver;
 156 extern void proc_tty_init(void);
 157 extern void proc_tty_register_driver(struct tty_driver *driver);
 158 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 159
 160 /*
 161  * proc_devtree.c
 162  */
 163 #ifdef CONFIG_PROC_DEVICETREE
 164 struct device_node;
 165 struct property;
 166 extern void proc_device_tree_init(void);
 167 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 168 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 169 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 170                                          struct property *prop);
 171 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 172                                          struct property *newprop,
 173                                          struct property *oldprop);
 174 #endif /* CONFIG_PROC_DEVICETREE */
 175
 176 extern struct proc_dir_entry *proc_symlink(const char *,
 177                 struct proc_dir_entry *, const char *);
 178 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 179 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 180                         struct proc_dir_entry *parent);
 181
 182 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 183         mode_t mode, struct proc_dir_entry *base,
 184         read_proc_t *read_proc, void * data)
 185 {
 186         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 187         if (res) {
 188                 res->read_proc=read_proc;
 189                 res->data=data;
 190         }
 191         return res;
 192 }
 193
 194 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 195         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 196 {
 197         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 198         if (res) res->get_info=get_info;
 199         return res;
 200 }
 201
 202 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 203         const char *name, mode_t mode, const struct file_operations *fops);
 204 extern void proc_net_remove(struct net *net, const char *name);
 205
 206 #else
 207
 208 #define proc_root_driver NULL
 209 #define proc_bus NULL
 210
 211 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 212 static inline void proc_net_remove(struct net *net, const char *name) {}
 213
 214 static inline void proc_flush_task(struct task_struct *task)
 215 {
 216 }
 217
 218 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 219         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 220
 221 #define remove_proc_entry(name, parent) do {} while (0)
 222
 223 static inline struct proc_dir_entry *proc_symlink(const char *name,
 224                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 225 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 226         struct proc_dir_entry *parent) {return NULL;}
 227
 228 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 229         mode_t mode, struct proc_dir_entry *base,
 230         read_proc_t *read_proc, void * data) { return NULL; }
 231 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 232         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 233         { return NULL; }
 234
 235 struct tty_driver;
 236 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 237 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 238
 239 extern struct proc_dir_entry proc_root;
 240
 241 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 242 {
 243         return 0;
 244 }
 245
 246 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 247 {
 248 }
 249
 250 #endif /* CONFIG_PROC_FS */
 251
 252 #if !defined(CONFIG_PROC_KCORE)
 253 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
 254 {
 255 }
 256 #else
 257 extern void kclist_add(struct kcore_list *, void *, size_t);
 258 #endif
 259
 260 union proc_op {
 261         int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
 262         int (*proc_read)(struct task_struct *task, char *page);
 263 };
 264
 265 struct proc_inode {
 266         struct pid *pid;
 267         int fd;
 268         union proc_op op;
 269         struct proc_dir_entry *pde;
 270         struct inode vfs_inode;
 271 };
 272
 273 static inline struct proc_inode *PROC_I(const struct inode *inode)
 274 {
 275         return container_of(inode, struct proc_inode, vfs_inode);
 276 }
 277
 278 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 279 {
 280         return PROC_I(inode)->pde;
 281 }
 282
 283 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 284 {
 285         return pde->parent->data;
 286 }
 287
 288 struct net *get_proc_net(const struct inode *inode);
 289
 290 struct proc_maps_private {
 291         struct pid *pid;
 292         struct task_struct *task;
 293 #ifdef CONFIG_MMU
 294         struct vm_area_struct *tail_vma;
 295 #endif
 296 };
 297
 298 #endif /* _LINUX_PROC_FS_H */