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 pde_users;  /* number of callers into module in progress */
  81         spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
  82         struct completion *pde_unload_completion;
  83         shadow_proc_t *shadow_proc;
  84 };
  85
  86 struct kcore_list {
  87         struct kcore_list *next;
  88         unsigned long addr;
  89         size_t size;
  90 };
  91
  92 struct vmcore {
  93         struct list_head list;
  94         unsigned long long paddr;
  95         unsigned long long size;
  96         loff_t offset;
  97 };
  98
  99 #ifdef CONFIG_PROC_FS
 100
 101 extern struct proc_dir_entry proc_root;
 102 extern struct proc_dir_entry *proc_root_fs;
 103 extern struct proc_dir_entry *proc_bus;
 104 extern struct proc_dir_entry *proc_root_driver;
 105 extern struct proc_dir_entry *proc_root_kcore;
 106
 107 extern spinlock_t proc_subdir_lock;
 108
 109 extern void proc_root_init(void);
 110 extern void proc_misc_init(void);
 111
 112 struct mm_struct;
 113
 114 void proc_flush_task(struct task_struct *task);
 115 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
 116 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 117 unsigned long task_vsize(struct mm_struct *);
 118 int task_statm(struct mm_struct *, int *, int *, int *, int *);
 119 char *task_mem(struct mm_struct *, char *);
 120 void clear_refs_smap(struct mm_struct *mm);
 121
 122 struct proc_dir_entry *de_get(struct proc_dir_entry *de);
 123 void de_put(struct proc_dir_entry *de);
 124
 125 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 126                                                 struct proc_dir_entry *parent);
 127 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 128
 129 extern struct vfsmount *proc_mnt;
 130 struct pid_namespace;
 131 extern int proc_fill_super(struct super_block *);
 132 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
 133
 134 /*
 135  * These are generic /proc routines that use the internal
 136  * "struct proc_dir_entry" tree to traverse the filesystem.
 137  *
 138  * The /proc root directory has extended versions to take care
 139  * of the /proc/<pid> subdirectories.
 140  */
 141 extern int proc_readdir(struct file *, void *, filldir_t);
 142 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
 143
 144 extern const struct file_operations proc_kcore_operations;
 145 extern const struct file_operations proc_kmsg_operations;
 146 extern const struct file_operations ppc_htab_operations;
 147
 148 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 149 extern void pid_ns_release_proc(struct pid_namespace *ns);
 150
 151 /*
 152  * proc_tty.c
 153  */
 154 struct tty_driver;
 155 extern void proc_tty_init(void);
 156 extern void proc_tty_register_driver(struct tty_driver *driver);
 157 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 158
 159 /*
 160  * proc_devtree.c
 161  */
 162 #ifdef CONFIG_PROC_DEVICETREE
 163 struct device_node;
 164 struct property;
 165 extern void proc_device_tree_init(void);
 166 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 167 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 168 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 169                                          struct property *prop);
 170 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 171                                          struct property *newprop,
 172                                          struct property *oldprop);
 173 #endif /* CONFIG_PROC_DEVICETREE */
 174
 175 extern struct proc_dir_entry *proc_symlink(const char *,
 176                 struct proc_dir_entry *, const char *);
 177 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 178 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 179                         struct proc_dir_entry *parent);
 180
 181 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 182         mode_t mode, struct proc_dir_entry *base,
 183         read_proc_t *read_proc, void * data)
 184 {
 185         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 186         if (res) {
 187                 res->read_proc=read_proc;
 188                 res->data=data;
 189         }
 190         return res;
 191 }
 192
 193 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 194         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 195 {
 196         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 197         if (res) res->get_info=get_info;
 198         return res;
 199 }
 200
 201 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 202         const char *name, mode_t mode, const struct file_operations *fops);
 203 extern void proc_net_remove(struct net *net, const char *name);
 204 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 205         struct proc_dir_entry *parent);
 206
 207 #else
 208
 209 #define proc_root_driver NULL
 210 #define proc_bus NULL
 211
 212 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 213 static inline void proc_net_remove(struct net *net, const char *name) {}
 214
 215 static inline void proc_flush_task(struct task_struct *task)
 216 {
 217 }
 218
 219 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 220         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 221
 222 #define remove_proc_entry(name, parent) do {} while (0)
 223
 224 static inline struct proc_dir_entry *proc_symlink(const char *name,
 225                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 226 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 227         struct proc_dir_entry *parent) {return NULL;}
 228
 229 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 230         mode_t mode, struct proc_dir_entry *base,
 231         read_proc_t *read_proc, void * data) { return NULL; }
 232 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
 233         mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
 234         { return NULL; }
 235
 236 struct tty_driver;
 237 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 238 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 239
 240 extern struct proc_dir_entry proc_root;
 241
 242 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 243 {
 244         return 0;
 245 }
 246
 247 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 248 {
 249 }
 250
 251 #endif /* CONFIG_PROC_FS */
 252
 253 #if !defined(CONFIG_PROC_KCORE)
 254 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
 255 {
 256 }
 257 #else
 258 extern void kclist_add(struct kcore_list *, void *, size_t);
 259 #endif
 260
 261 union proc_op {
 262         int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
 263         int (*proc_read)(struct task_struct *task, char *page);
 264 };
 265
 266 struct proc_inode {
 267         struct pid *pid;
 268         int fd;
 269         union proc_op op;
 270         struct proc_dir_entry *pde;
 271         struct inode vfs_inode;
 272 };
 273
 274 static inline struct proc_inode *PROC_I(const struct inode *inode)
 275 {
 276         return container_of(inode, struct proc_inode, vfs_inode);
 277 }
 278
 279 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 280 {
 281         return PROC_I(inode)->pde;
 282 }
 283
 284 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 285 {
 286         return pde->parent->data;
 287 }
 288
 289 struct net *get_proc_net(const struct inode *inode);
 290
 291 struct proc_maps_private {
 292         struct pid *pid;
 293         struct task_struct *task;
 294 #ifdef CONFIG_MMU
 295         struct vm_area_struct *tail_vma;
 296 #endif
 297 };
 298
 299 #endif /* _LINUX_PROC_FS_H */