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 struct mm_struct;
  13
  14 /*
  15  * The proc filesystem constants/structures
  16  */
  17
  18 /*
  19  * Offset of the first process in the /proc root directory..
  20  */
  21 #define FIRST_PROCESS_ENTRY 256
  22
  23 /* Worst case buffer size needed for holding an integer. */
  24 #define PROC_NUMBUF 13
  25
  26 /*
  27  * We always define these enumerators
  28  */
  29
  30 enum {
  31         PROC_ROOT_INO = 1,
  32 };
  33
  34 /*
  35  * This is not completely implemented yet. The idea is to
  36  * create an in-memory tree (like the actual /proc filesystem
  37  * tree) of these proc_dir_entries, so that we can dynamically
  38  * add new files to /proc.
  39  *
  40  * The "next" pointer creates a linked list of one /proc directory,
  41  * while parent/subdir create the directory structure (every
  42  * /proc file has a parent, but "subdir" is NULL for all
  43  * non-directory entries).
  44  *
  45  * "owner" is used to protect module
  46  * from unloading while proc_dir_entry is in use
  47  */
  48
  49 typedef int (read_proc_t)(char *page, char **start, off_t off,
  50                           int count, int *eof, void *data);
  51 typedef int (write_proc_t)(struct file *file, const char __user *buffer,
  52                            unsigned long count, void *data);
  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         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         struct list_head pde_openers;   /* who did ->open, but not ->release */
  83 };
  84
  85 struct kcore_list {
  86         struct kcore_list *next;
  87         unsigned long addr;
  88         size_t size;
  89 };
  90
  91 struct vmcore {
  92         struct list_head list;
  93         unsigned long long paddr;
  94         unsigned long long size;
  95         loff_t offset;
  96 };
  97
  98 #ifdef CONFIG_PROC_FS
  99
 100 extern spinlock_t proc_subdir_lock;
 101
 102 extern void proc_root_init(void);
 103
 104 void proc_flush_task(struct task_struct *task);
 105 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
 106 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 107 unsigned long task_vsize(struct mm_struct *);
 108 int task_statm(struct mm_struct *, int *, int *, int *, int *);
 109 void task_mem(struct seq_file *, struct mm_struct *);
 110 void clear_refs_smap(struct mm_struct *mm);
 111
 112 struct proc_dir_entry *de_get(struct proc_dir_entry *de);
 113 void de_put(struct proc_dir_entry *de);
 114
 115 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 116                                                 struct proc_dir_entry *parent);
 117 struct proc_dir_entry *proc_create_data(const char *name, mode_t mode,
 118                                 struct proc_dir_entry *parent,
 119                                 const struct file_operations *proc_fops,
 120                                 void *data);
 121 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 122
 123 extern struct vfsmount *proc_mnt;
 124 struct pid_namespace;
 125 extern int proc_fill_super(struct super_block *);
 126 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
 127
 128 /*
 129  * These are generic /proc routines that use the internal
 130  * "struct proc_dir_entry" tree to traverse the filesystem.
 131  *
 132  * The /proc root directory has extended versions to take care
 133  * of the /proc/<pid> subdirectories.
 134  */
 135 extern int proc_readdir(struct file *, void *, filldir_t);
 136 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
 137
 138 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 139 extern void pid_ns_release_proc(struct pid_namespace *ns);
 140
 141 /*
 142  * proc_tty.c
 143  */
 144 struct tty_driver;
 145 extern void proc_tty_init(void);
 146 extern void proc_tty_register_driver(struct tty_driver *driver);
 147 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 148
 149 /*
 150  * proc_devtree.c
 151  */
 152 #ifdef CONFIG_PROC_DEVICETREE
 153 struct device_node;
 154 struct property;
 155 extern void proc_device_tree_init(void);
 156 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 157 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 158 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 159                                          struct property *prop);
 160 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 161                                          struct property *newprop,
 162                                          struct property *oldprop);
 163 #endif /* CONFIG_PROC_DEVICETREE */
 164
 165 extern struct proc_dir_entry *proc_symlink(const char *,
 166                 struct proc_dir_entry *, const char *);
 167 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 168 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 169                         struct proc_dir_entry *parent);
 170
 171 static inline struct proc_dir_entry *proc_create(const char *name, mode_t mode,
 172         struct proc_dir_entry *parent, const struct file_operations *proc_fops)
 173 {
 174         return proc_create_data(name, mode, parent, proc_fops, NULL);
 175 }
 176
 177 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 178         mode_t mode, struct proc_dir_entry *base,
 179         read_proc_t *read_proc, void * data)
 180 {
 181         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 182         if (res) {
 183                 res->read_proc=read_proc;
 184                 res->data=data;
 185         }
 186         return res;
 187 }
 188
 189 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 190         const char *name, mode_t mode, const struct file_operations *fops);
 191 extern void proc_net_remove(struct net *net, const char *name);
 192 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 193         struct proc_dir_entry *parent);
 194
 195 /* While the {get|set|dup}_mm_exe_file functions are for mm_structs, they are
 196  * only needed to implement /proc/<pid>|self/exe so we define them here. */
 197 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
 198 extern struct file *get_mm_exe_file(struct mm_struct *mm);
 199 extern void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm);
 200
 201 #else
 202
 203 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 204 static inline void proc_net_remove(struct net *net, const char *name) {}
 205
 206 static inline void proc_flush_task(struct task_struct *task)
 207 {
 208 }
 209
 210 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 211         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 212 static inline struct proc_dir_entry *proc_create(const char *name,
 213         mode_t mode, struct proc_dir_entry *parent,
 214         const struct file_operations *proc_fops)
 215 {
 216         return NULL;
 217 }
 218 static inline struct proc_dir_entry *proc_create_data(const char *name,
 219         mode_t mode, struct proc_dir_entry *parent,
 220         const struct file_operations *proc_fops, void *data)
 221 {
 222         return NULL;
 223 }
 224 #define remove_proc_entry(name, parent) do {} while (0)
 225
 226 static inline struct proc_dir_entry *proc_symlink(const char *name,
 227                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 228 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 229         struct proc_dir_entry *parent) {return NULL;}
 230
 231 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 232         mode_t mode, struct proc_dir_entry *base,
 233         read_proc_t *read_proc, void * data) { 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 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 240 {
 241         return 0;
 242 }
 243
 244 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 245 {
 246 }
 247
 248 static inline void set_mm_exe_file(struct mm_struct *mm,
 249                                    struct file *new_exe_file)
 250 {}
 251
 252 static inline struct file *get_mm_exe_file(struct mm_struct *mm)
 253 {
 254         return NULL;
 255 }
 256
 257 static inline void dup_mm_exe_file(struct mm_struct *oldmm,
 258                                    struct mm_struct *newmm)
 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 ctl_table_header;
 280 struct ctl_table;
 281
 282 struct proc_inode {
 283         struct pid *pid;
 284         int fd;
 285         union proc_op op;
 286         struct proc_dir_entry *pde;
 287         struct ctl_table_header *sysctl;
 288         struct ctl_table *sysctl_entry;
 289         struct inode vfs_inode;
 290 };
 291
 292 static inline struct proc_inode *PROC_I(const struct inode *inode)
 293 {
 294         return container_of(inode, struct proc_inode, vfs_inode);
 295 }
 296
 297 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 298 {
 299         return PROC_I(inode)->pde;
 300 }
 301
 302 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 303 {
 304         return pde->parent->data;
 305 }
 306
 307 struct proc_maps_private {
 308         struct pid *pid;
 309         struct task_struct *task;
 310 #ifdef CONFIG_MMU
 311         struct vm_area_struct *tail_vma;
 312 #endif
 313 };
 314
 315 #endif /* _LINUX_PROC_FS_H */