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  * The proc filesystem constants/structures
  14  */
  15
  16 /*
  17  * Offset of the first process in the /proc root directory..
  18  */
  19 #define FIRST_PROCESS_ENTRY 256
  20
  21 /* Worst case buffer size needed for holding an integer. */
  22 #define PROC_NUMBUF 13
  23
  24 /*
  25  * We always define these enumerators
  26  */
  27
  28 enum {
  29         PROC_ROOT_INO = 1,
  30 };
  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 __user *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 int 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         loff_t size;
  62         const struct inode_operations *proc_iops;
  63         /*
  64          * NULL ->proc_fops means "PDE is going away RSN" or
  65          * "PDE is just created". In either case, e.g. ->read_proc won't be
  66          * called because it's too late or too early, respectively.
  67          *
  68          * If you're allocating ->proc_fops dynamically, save a pointer
  69          * somewhere.
  70          */
  71         const struct file_operations *proc_fops;
  72         get_info_t *get_info;
  73         struct module *owner;
  74         struct proc_dir_entry *next, *parent, *subdir;
  75         void *data;
  76         read_proc_t *read_proc;
  77         write_proc_t *write_proc;
  78         atomic_t count;         /* use count */
  79         int pde_users;  /* number of callers into module in progress */
  80         spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
  81         struct completion *pde_unload_completion;
  82 };
  83
  84 struct kcore_list {
  85         struct kcore_list *next;
  86         unsigned long addr;
  87         size_t size;
  88 };
  89
  90 struct vmcore {
  91         struct list_head list;
  92         unsigned long long paddr;
  93         unsigned long long size;
  94         loff_t offset;
  95 };
  96
  97 #ifdef CONFIG_PROC_FS
  98
  99 extern struct proc_dir_entry proc_root;
 100 extern struct proc_dir_entry *proc_root_kcore;
 101
 102 extern spinlock_t proc_subdir_lock;
 103
 104 extern void proc_root_init(void);
 105 extern void proc_misc_init(void);
 106
 107 struct mm_struct;
 108
 109 void proc_flush_task(struct task_struct *task);
 110 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
 111 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 112 unsigned long task_vsize(struct mm_struct *);
 113 int task_statm(struct mm_struct *, int *, int *, int *, int *);
 114 void task_mem(struct seq_file *, struct mm_struct *);
 115 void clear_refs_smap(struct mm_struct *mm);
 116
 117 struct proc_dir_entry *de_get(struct proc_dir_entry *de);
 118 void de_put(struct proc_dir_entry *de);
 119
 120 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 121                                                 struct proc_dir_entry *parent);
 122 struct proc_dir_entry *proc_create(const char *name, mode_t mode,
 123                                 struct proc_dir_entry *parent,
 124                                 const struct file_operations *proc_fops);
 125 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 126
 127 extern struct vfsmount *proc_mnt;
 128 struct pid_namespace;
 129 extern int proc_fill_super(struct super_block *);
 130 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
 131
 132 /*
 133  * These are generic /proc routines that use the internal
 134  * "struct proc_dir_entry" tree to traverse the filesystem.
 135  *
 136  * The /proc root directory has extended versions to take care
 137  * of the /proc/<pid> subdirectories.
 138  */
 139 extern int proc_readdir(struct file *, void *, filldir_t);
 140 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
 141
 142 extern const struct file_operations proc_kcore_operations;
 143 extern const struct file_operations proc_kmsg_operations;
 144 extern const struct file_operations ppc_htab_operations;
 145
 146 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 147 extern void pid_ns_release_proc(struct pid_namespace *ns);
 148
 149 /*
 150  * proc_tty.c
 151  */
 152 struct tty_driver;
 153 extern void proc_tty_init(void);
 154 extern void proc_tty_register_driver(struct tty_driver *driver);
 155 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 156
 157 /*
 158  * proc_devtree.c
 159  */
 160 #ifdef CONFIG_PROC_DEVICETREE
 161 struct device_node;
 162 struct property;
 163 extern void proc_device_tree_init(void);
 164 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 165 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 166 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 167                                          struct property *prop);
 168 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 169                                          struct property *newprop,
 170                                          struct property *oldprop);
 171 #endif /* CONFIG_PROC_DEVICETREE */
 172
 173 extern struct proc_dir_entry *proc_symlink(const char *,
 174                 struct proc_dir_entry *, const char *);
 175 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 176 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 177                         struct proc_dir_entry *parent);
 178
 179 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 180         mode_t mode, struct proc_dir_entry *base,
 181         read_proc_t *read_proc, void * data)
 182 {
 183         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 184         if (res) {
 185                 res->read_proc=read_proc;
 186                 res->data=data;
 187         }
 188         return res;
 189 }
 190
 191 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 192         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 193 {
 194         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 195         if (res) res->get_info=get_info;
 196         return res;
 197 }
 198
 199 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 200         const char *name, mode_t mode, const struct file_operations *fops);
 201 extern void proc_net_remove(struct net *net, const char *name);
 202 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 203         struct proc_dir_entry *parent);
 204
 205 /* While the {get|set|dup}_mm_exe_file functions are for mm_structs, they are
 206  * only needed to implement /proc/<pid>|self/exe so we define them here. */
 207 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
 208 extern struct file *get_mm_exe_file(struct mm_struct *mm);
 209 extern void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm);
 210
 211 #else
 212
 213 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 214 static inline void proc_net_remove(struct net *net, const char *name) {}
 215
 216 static inline void proc_flush_task(struct task_struct *task)
 217 {
 218 }
 219
 220 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 221         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 222 static inline struct proc_dir_entry *proc_create(const char *name,
 223         mode_t mode, struct proc_dir_entry *parent,
 224         const struct file_operations *proc_fops)
 225 {
 226         return NULL;
 227 }
 228 #define remove_proc_entry(name, parent) do {} while (0)
 229
 230 static inline struct proc_dir_entry *proc_symlink(const char *name,
 231                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 232 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 233         struct proc_dir_entry *parent) {return NULL;}
 234
 235 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 236         mode_t mode, struct proc_dir_entry *base,
 237         read_proc_t *read_proc, void * data) { return NULL; }
 238 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 239         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 240         { return NULL; }
 241
 242 struct tty_driver;
 243 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 244 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 245
 246 extern struct proc_dir_entry proc_root;
 247
 248 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 249 {
 250         return 0;
 251 }
 252
 253 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 254 {
 255 }
 256
 257 static inline void set_mm_exe_file(struct mm_struct *mm,
 258                                    struct file *new_exe_file)
 259 {}
 260
 261 static inline struct file *get_mm_exe_file(struct mm_struct *mm)
 262 {
 263         return NULL;
 264 }
 265
 266 static inline void dup_mm_exe_file(struct mm_struct *oldmm,
 267                                    struct mm_struct *newmm)
 268 {}
 269
 270 #endif /* CONFIG_PROC_FS */
 271
 272 #if !defined(CONFIG_PROC_KCORE)
 273 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
 274 {
 275 }
 276 #else
 277 extern void kclist_add(struct kcore_list *, void *, size_t);
 278 #endif
 279
 280 union proc_op {
 281         int (*proc_get_link)(struct inode *, struct path *);
 282         int (*proc_read)(struct task_struct *task, char *page);
 283         int (*proc_show)(struct seq_file *m,
 284                 struct pid_namespace *ns, struct pid *pid,
 285                 struct task_struct *task);
 286 };
 287
 288 struct proc_inode {
 289         struct pid *pid;
 290         int fd;
 291         union proc_op op;
 292         struct proc_dir_entry *pde;
 293         struct inode vfs_inode;
 294 };
 295
 296 static inline struct proc_inode *PROC_I(const struct inode *inode)
 297 {
 298         return container_of(inode, struct proc_inode, vfs_inode);
 299 }
 300
 301 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 302 {
 303         return PROC_I(inode)->pde;
 304 }
 305
 306 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 307 {
 308         return pde->parent->data;
 309 }
 310
 311 struct net *get_proc_net(const struct inode *inode);
 312
 313 struct proc_maps_private {
 314         struct pid *pid;
 315         struct task_struct *task;
 316 #ifdef CONFIG_MMU
 317         struct vm_area_struct *tail_vma;
 318 #endif
 319 };
 320
 321 #endif /* _LINUX_PROC_FS_H */