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
  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
  51 struct proc_dir_entry {
  52         unsigned int low_ino;
  53         unsigned short namelen;
  54         const char *name;
  55         mode_t mode;
  56         nlink_t nlink;
  57         uid_t uid;
  58         gid_t gid;
  59         loff_t size;
  60         const struct inode_operations *proc_iops;
  61         /*
  62          * NULL ->proc_fops means "PDE is going away RSN" or
  63          * "PDE is just created". In either case, e.g. ->read_proc won't be
  64          * called because it's too late or too early, respectively.
  65          *
  66          * If you're allocating ->proc_fops dynamically, save a pointer
  67          * somewhere.
  68          */
  69         const struct file_operations *proc_fops;
  70         struct proc_dir_entry *next, *parent, *subdir;
  71         void *data;
  72         read_proc_t *read_proc;
  73         write_proc_t *write_proc;
  74         atomic_t count;         /* use count */
  75         int pde_users;  /* number of callers into module in progress */
  76         spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
  77         struct completion *pde_unload_completion;
  78         struct list_head pde_openers;   /* who did ->open, but not ->release */
  79 };
  80
  81 struct kcore_list {
  82         struct kcore_list *next;
  83         unsigned long addr;
  84         size_t size;
  85 };
  86
  87 struct vmcore {
  88         struct list_head list;
  89         unsigned long long paddr;
  90         unsigned long long size;
  91         loff_t offset;
  92 };
  93
  94 #ifdef CONFIG_PROC_FS
  95
  96 extern void proc_root_init(void);
  97
  98 void proc_flush_task(struct task_struct *task);
  99
 100 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 101                                                 struct proc_dir_entry *parent);
 102 struct proc_dir_entry *proc_create_data(const char *name, mode_t mode,
 103                                 struct proc_dir_entry *parent,
 104                                 const struct file_operations *proc_fops,
 105                                 void *data);
 106 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 107
 108 struct pid_namespace;
 109
 110 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 111 extern void pid_ns_release_proc(struct pid_namespace *ns);
 112
 113 /*
 114  * proc_tty.c
 115  */
 116 struct tty_driver;
 117 extern void proc_tty_init(void);
 118 extern void proc_tty_register_driver(struct tty_driver *driver);
 119 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 120
 121 /*
 122  * proc_devtree.c
 123  */
 124 #ifdef CONFIG_PROC_DEVICETREE
 125 struct device_node;
 126 struct property;
 127 extern void proc_device_tree_init(void);
 128 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 129 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 130 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 131                                          struct property *prop);
 132 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 133                                          struct property *newprop,
 134                                          struct property *oldprop);
 135 #endif /* CONFIG_PROC_DEVICETREE */
 136
 137 extern struct proc_dir_entry *proc_symlink(const char *,
 138                 struct proc_dir_entry *, const char *);
 139 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 140 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 141                         struct proc_dir_entry *parent);
 142
 143 static inline struct proc_dir_entry *proc_create(const char *name, mode_t mode,
 144         struct proc_dir_entry *parent, const struct file_operations *proc_fops)
 145 {
 146         return proc_create_data(name, mode, parent, proc_fops, NULL);
 147 }
 148
 149 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 150         mode_t mode, struct proc_dir_entry *base,
 151         read_proc_t *read_proc, void * data)
 152 {
 153         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 154         if (res) {
 155                 res->read_proc=read_proc;
 156                 res->data=data;
 157         }
 158         return res;
 159 }
 160
 161 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 162         const char *name, mode_t mode, const struct file_operations *fops);
 163 extern void proc_net_remove(struct net *net, const char *name);
 164 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 165         struct proc_dir_entry *parent);
 166
 167 /* While the {get|set|dup}_mm_exe_file functions are for mm_structs, they are
 168  * only needed to implement /proc/<pid>|self/exe so we define them here. */
 169 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
 170 extern struct file *get_mm_exe_file(struct mm_struct *mm);
 171 extern void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm);
 172
 173 #else
 174
 175 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 176 static inline void proc_net_remove(struct net *net, const char *name) {}
 177
 178 static inline void proc_flush_task(struct task_struct *task)
 179 {
 180 }
 181
 182 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 183         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 184 static inline struct proc_dir_entry *proc_create(const char *name,
 185         mode_t mode, struct proc_dir_entry *parent,
 186         const struct file_operations *proc_fops)
 187 {
 188         return NULL;
 189 }
 190 static inline struct proc_dir_entry *proc_create_data(const char *name,
 191         mode_t mode, struct proc_dir_entry *parent,
 192         const struct file_operations *proc_fops, void *data)
 193 {
 194         return NULL;
 195 }
 196 #define remove_proc_entry(name, parent) do {} while (0)
 197
 198 static inline struct proc_dir_entry *proc_symlink(const char *name,
 199                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 200 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 201         struct proc_dir_entry *parent) {return NULL;}
 202
 203 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 204         mode_t mode, struct proc_dir_entry *base,
 205         read_proc_t *read_proc, void * data) { return NULL; }
 206
 207 struct tty_driver;
 208 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 209 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 210
 211 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 212 {
 213         return 0;
 214 }
 215
 216 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 217 {
 218 }
 219
 220 static inline void set_mm_exe_file(struct mm_struct *mm,
 221                                    struct file *new_exe_file)
 222 {}
 223
 224 static inline struct file *get_mm_exe_file(struct mm_struct *mm)
 225 {
 226         return NULL;
 227 }
 228
 229 static inline void dup_mm_exe_file(struct mm_struct *oldmm,
 230                                    struct mm_struct *newmm)
 231 {}
 232
 233 #endif /* CONFIG_PROC_FS */
 234
 235 #if !defined(CONFIG_PROC_KCORE)
 236 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
 237 {
 238 }
 239 #else
 240 extern void kclist_add(struct kcore_list *, void *, size_t);
 241 #endif
 242
 243 union proc_op {
 244         int (*proc_get_link)(struct inode *, struct path *);
 245         int (*proc_read)(struct task_struct *task, char *page);
 246         int (*proc_show)(struct seq_file *m,
 247                 struct pid_namespace *ns, struct pid *pid,
 248                 struct task_struct *task);
 249 };
 250
 251 struct ctl_table_header;
 252 struct ctl_table;
 253
 254 struct proc_inode {
 255         struct pid *pid;
 256         int fd;
 257         union proc_op op;
 258         struct proc_dir_entry *pde;
 259         struct ctl_table_header *sysctl;
 260         struct ctl_table *sysctl_entry;
 261         struct inode vfs_inode;
 262 };
 263
 264 static inline struct proc_inode *PROC_I(const struct inode *inode)
 265 {
 266         return container_of(inode, struct proc_inode, vfs_inode);
 267 }
 268
 269 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 270 {
 271         return PROC_I(inode)->pde;
 272 }
 273
 274 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 275 {
 276         return pde->parent->data;
 277 }
 278
 279 struct proc_maps_private {
 280         struct pid *pid;
 281         struct task_struct *task;
 282 #ifdef CONFIG_MMU
 283         struct vm_area_struct *tail_vma;
 284 #endif
 285 };
 286
 287 #endif /* _LINUX_PROC_FS_H */