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 /* Worst case buffer size needed for holding an integer. */
  23 #define PROC_NUMBUF 13
  24
  25 /*
  26  * We always define these enumerators
  27  */
  28
  29 enum {
  30         PROC_ROOT_INO = 1,
  31 };
  32
  33 /*
  34  * This is not completely implemented yet. The idea is to
  35  * create an in-memory tree (like the actual /proc filesystem
  36  * tree) of these proc_dir_entries, so that we can dynamically
  37  * add new files to /proc.
  38  *
  39  * The "next" pointer creates a linked list of one /proc directory,
  40  * while parent/subdir create the directory structure (every
  41  * /proc file has a parent, but "subdir" is NULL for all
  42  * non-directory entries).
  43  *
  44  * "get_info" is called at "read", while "owner" is used to protect module
  45  * from unloading while proc_dir_entry is in use
  46  */
  47
  48 typedef int (read_proc_t)(char *page, char **start, off_t off,
  49                           int count, int *eof, void *data);
  50 typedef int (write_proc_t)(struct file *file, const char __user *buffer,
  51                            unsigned long count, void *data);
  52 typedef int (get_info_t)(char *, char **, off_t, int);
  53 typedef struct proc_dir_entry *(shadow_proc_t)(struct task_struct *task,
  54                                                 struct proc_dir_entry *pde);
  55
  56 struct proc_dir_entry {
  57         unsigned int low_ino;
  58         unsigned short namelen;
  59         const char *name;
  60         mode_t mode;
  61         nlink_t nlink;
  62         uid_t uid;
  63         gid_t gid;
  64         loff_t size;
  65         const struct inode_operations *proc_iops;
  66         /*
  67          * NULL ->proc_fops means "PDE is going away RSN" or
  68          * "PDE is just created". In either case, e.g. ->read_proc won't be
  69          * called because it's too late or too early, respectively.
  70          *
  71          * If you're allocating ->proc_fops dynamically, save a pointer
  72          * somewhere.
  73          */
  74         const struct file_operations *proc_fops;
  75         get_info_t *get_info;
  76         struct module *owner;
  77         struct proc_dir_entry *next, *parent, *subdir;
  78         void *data;
  79         read_proc_t *read_proc;
  80         write_proc_t *write_proc;
  81         atomic_t count;         /* use count */
  82         int pde_users;  /* number of callers into module in progress */
  83         spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
  84         struct completion *pde_unload_completion;
  85         shadow_proc_t *shadow_proc;
  86 };
  87
  88 struct kcore_list {
  89         struct kcore_list *next;
  90         unsigned long addr;
  91         size_t size;
  92 };
  93
  94 struct vmcore {
  95         struct list_head list;
  96         unsigned long long paddr;
  97         unsigned long long size;
  98         loff_t offset;
  99 };
 100
 101 #ifdef CONFIG_PROC_FS
 102
 103 extern struct proc_dir_entry proc_root;
 104 extern struct proc_dir_entry *proc_root_fs;
 105 extern struct proc_dir_entry *proc_bus;
 106 extern struct proc_dir_entry *proc_root_driver;
 107 extern struct proc_dir_entry *proc_root_kcore;
 108
 109 extern spinlock_t proc_subdir_lock;
 110
 111 extern void proc_root_init(void);
 112 extern void proc_misc_init(void);
 113
 114 struct mm_struct;
 115
 116 void proc_flush_task(struct task_struct *task);
 117 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
 118 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 119 unsigned long task_vsize(struct mm_struct *);
 120 int task_statm(struct mm_struct *, int *, int *, int *, int *);
 121 void task_mem(struct seq_file *, struct mm_struct *);
 122 void clear_refs_smap(struct mm_struct *mm);
 123
 124 struct proc_dir_entry *de_get(struct proc_dir_entry *de);
 125 void de_put(struct proc_dir_entry *de);
 126
 127 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 128                                                 struct proc_dir_entry *parent);
 129 struct proc_dir_entry *proc_create(const char *name, mode_t mode,
 130                                 struct proc_dir_entry *parent,
 131                                 const struct file_operations *proc_fops);
 132 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 133
 134 extern struct vfsmount *proc_mnt;
 135 struct pid_namespace;
 136 extern int proc_fill_super(struct super_block *);
 137 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
 138
 139 /*
 140  * These are generic /proc routines that use the internal
 141  * "struct proc_dir_entry" tree to traverse the filesystem.
 142  *
 143  * The /proc root directory has extended versions to take care
 144  * of the /proc/<pid> subdirectories.
 145  */
 146 extern int proc_readdir(struct file *, void *, filldir_t);
 147 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
 148
 149 extern const struct file_operations proc_kcore_operations;
 150 extern const struct file_operations proc_kmsg_operations;
 151 extern const struct file_operations ppc_htab_operations;
 152
 153 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 154 extern void pid_ns_release_proc(struct pid_namespace *ns);
 155
 156 /*
 157  * proc_tty.c
 158  */
 159 struct tty_driver;
 160 extern void proc_tty_init(void);
 161 extern void proc_tty_register_driver(struct tty_driver *driver);
 162 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 163
 164 /*
 165  * proc_devtree.c
 166  */
 167 #ifdef CONFIG_PROC_DEVICETREE
 168 struct device_node;
 169 struct property;
 170 extern void proc_device_tree_init(void);
 171 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 172 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 173 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 174                                          struct property *prop);
 175 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 176                                          struct property *newprop,
 177                                          struct property *oldprop);
 178 #endif /* CONFIG_PROC_DEVICETREE */
 179
 180 extern struct proc_dir_entry *proc_symlink(const char *,
 181                 struct proc_dir_entry *, const char *);
 182 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 183 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 184                         struct proc_dir_entry *parent);
 185
 186 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 187         mode_t mode, struct proc_dir_entry *base,
 188         read_proc_t *read_proc, void * data)
 189 {
 190         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 191         if (res) {
 192                 res->read_proc=read_proc;
 193                 res->data=data;
 194         }
 195         return res;
 196 }
 197
 198 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 199         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 200 {
 201         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 202         if (res) res->get_info=get_info;
 203         return res;
 204 }
 205
 206 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 207         const char *name, mode_t mode, const struct file_operations *fops);
 208 extern void proc_net_remove(struct net *net, const char *name);
 209 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 210         struct proc_dir_entry *parent);
 211
 212 #else
 213
 214 #define proc_root_driver NULL
 215 #define proc_bus NULL
 216
 217 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 218 static inline void proc_net_remove(struct net *net, const char *name) {}
 219
 220 static inline void proc_flush_task(struct task_struct *task)
 221 {
 222 }
 223
 224 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 225         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 226 static inline struct proc_dir_entry *proc_create(const char *name,
 227         mode_t mode, struct proc_dir_entry *parent,
 228         const struct file_operations *proc_fops)
 229 {
 230         return NULL;
 231 }
 232 #define remove_proc_entry(name, parent) do {} while (0)
 233
 234 static inline struct proc_dir_entry *proc_symlink(const char *name,
 235                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 236 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 237         struct proc_dir_entry *parent) {return NULL;}
 238
 239 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 240         mode_t mode, struct proc_dir_entry *base,
 241         read_proc_t *read_proc, void * data) { return NULL; }
 242 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 243         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 244         { return NULL; }
 245
 246 struct tty_driver;
 247 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 248 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 249
 250 extern struct proc_dir_entry proc_root;
 251
 252 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 253 {
 254         return 0;
 255 }
 256
 257 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 258 {
 259 }
 260
 261 #endif /* CONFIG_PROC_FS */
 262
 263 #if !defined(CONFIG_PROC_KCORE)
 264 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
 265 {
 266 }
 267 #else
 268 extern void kclist_add(struct kcore_list *, void *, size_t);
 269 #endif
 270
 271 union proc_op {
 272         int (*proc_get_link)(struct inode *, struct path *);
 273         int (*proc_read)(struct task_struct *task, char *page);
 274         int (*proc_show)(struct seq_file *m,
 275                 struct pid_namespace *ns, struct pid *pid,
 276                 struct task_struct *task);
 277 };
 278
 279 struct proc_inode {
 280         struct pid *pid;
 281         int fd;
 282         union proc_op op;
 283         struct proc_dir_entry *pde;
 284         struct inode vfs_inode;
 285 };
 286
 287 static inline struct proc_inode *PROC_I(const struct inode *inode)
 288 {
 289         return container_of(inode, struct proc_inode, vfs_inode);
 290 }
 291
 292 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 293 {
 294         return PROC_I(inode)->pde;
 295 }
 296
 297 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 298 {
 299         return pde->parent->data;
 300 }
 301
 302 struct net *get_proc_net(const struct inode *inode);
 303
 304 struct proc_maps_private {
 305         struct pid *pid;
 306         struct task_struct *task;
 307 #ifdef CONFIG_MMU
 308         struct vm_area_struct *tail_vma;
 309 #endif
 310 };
 311
 312 #endif /* _LINUX_PROC_FS_H */