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 int 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 enum kcore_type {
  82         KCORE_TEXT,
  83         KCORE_VMALLOC,
  84         KCORE_RAM,
  85         KCORE_VMEMMAP,
  86         KCORE_OTHER,
  87 };
  88
  89 struct kcore_list {
  90         struct list_head list;
  91         unsigned long addr;
  92         size_t size;
  93         int type;
  94 };
  95
  96 struct vmcore {
  97         struct list_head list;
  98         unsigned long long paddr;
  99         unsigned long long size;
 100         loff_t offset;
 101 };
 102
 103 #ifdef CONFIG_PROC_FS
 104
 105 extern void proc_root_init(void);
 106
 107 void proc_flush_task(struct task_struct *task);
 108
 109 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 110                                                 struct proc_dir_entry *parent);
 111 struct proc_dir_entry *proc_create_data(const char *name, mode_t mode,
 112                                 struct proc_dir_entry *parent,
 113                                 const struct file_operations *proc_fops,
 114                                 void *data);
 115 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 116
 117 struct pid_namespace;
 118
 119 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 120 extern void pid_ns_release_proc(struct pid_namespace *ns);
 121
 122 /*
 123  * proc_tty.c
 124  */
 125 struct tty_driver;
 126 extern void proc_tty_init(void);
 127 extern void proc_tty_register_driver(struct tty_driver *driver);
 128 extern void proc_tty_unregister_driver(struct tty_driver *driver);
 129
 130 /*
 131  * proc_devtree.c
 132  */
 133 #ifdef CONFIG_PROC_DEVICETREE
 134 struct device_node;
 135 struct property;
 136 extern void proc_device_tree_init(void);
 137 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 138 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 139 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 140                                          struct property *prop);
 141 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 142                                          struct property *newprop,
 143                                          struct property *oldprop);
 144 #endif /* CONFIG_PROC_DEVICETREE */
 145
 146 extern struct proc_dir_entry *proc_symlink(const char *,
 147                 struct proc_dir_entry *, const char *);
 148 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 149 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
 150                         struct proc_dir_entry *parent);
 151
 152 static inline struct proc_dir_entry *proc_create(const char *name, mode_t mode,
 153         struct proc_dir_entry *parent, const struct file_operations *proc_fops)
 154 {
 155         return proc_create_data(name, mode, parent, proc_fops, NULL);
 156 }
 157
 158 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 159         mode_t mode, struct proc_dir_entry *base,
 160         read_proc_t *read_proc, void * data)
 161 {
 162         struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 163         if (res) {
 164                 res->read_proc=read_proc;
 165                 res->data=data;
 166         }
 167         return res;
 168 }
 169
 170 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 171         const char *name, mode_t mode, const struct file_operations *fops);
 172 extern void proc_net_remove(struct net *net, const char *name);
 173 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 174         struct proc_dir_entry *parent);
 175
 176 /* While the {get|set|dup}_mm_exe_file functions are for mm_structs, they are
 177  * only needed to implement /proc/<pid>|self/exe so we define them here. */
 178 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
 179 extern struct file *get_mm_exe_file(struct mm_struct *mm);
 180 extern void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm);
 181
 182 extern struct file *proc_ns_fget(int fd);
 183
 184 #else
 185
 186 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 187 static inline void proc_net_remove(struct net *net, const char *name) {}
 188
 189 static inline void proc_flush_task(struct task_struct *task)
 190 {
 191 }
 192
 193 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 194         mode_t mode, struct proc_dir_entry *parent) { return NULL; }
 195 static inline struct proc_dir_entry *proc_create(const char *name,
 196         mode_t mode, struct proc_dir_entry *parent,
 197         const struct file_operations *proc_fops)
 198 {
 199         return NULL;
 200 }
 201 static inline struct proc_dir_entry *proc_create_data(const char *name,
 202         mode_t mode, struct proc_dir_entry *parent,
 203         const struct file_operations *proc_fops, void *data)
 204 {
 205         return NULL;
 206 }
 207 #define remove_proc_entry(name, parent) do {} while (0)
 208
 209 static inline struct proc_dir_entry *proc_symlink(const char *name,
 210                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 211 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 212         struct proc_dir_entry *parent) {return NULL;}
 213
 214 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 215         mode_t mode, struct proc_dir_entry *base,
 216         read_proc_t *read_proc, void * data) { return NULL; }
 217
 218 struct tty_driver;
 219 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 220 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 221
 222 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 223 {
 224         return 0;
 225 }
 226
 227 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 228 {
 229 }
 230
 231 static inline void set_mm_exe_file(struct mm_struct *mm,
 232                                    struct file *new_exe_file)
 233 {}
 234
 235 static inline struct file *get_mm_exe_file(struct mm_struct *mm)
 236 {
 237         return NULL;
 238 }
 239
 240 static inline void dup_mm_exe_file(struct mm_struct *oldmm,
 241                                    struct mm_struct *newmm)
 242 {}
 243
 244 static inline struct file *proc_ns_fget(int fd)
 245 {
 246         return ERR_PTR(-EINVAL);
 247 }
 248
 249 #endif /* CONFIG_PROC_FS */
 250
 251 #if !defined(CONFIG_PROC_KCORE)
 252 static inline void
 253 kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
 254 {
 255 }
 256 #else
 257 extern void kclist_add(struct kcore_list *, void *, size_t, int type);
 258 #endif
 259
 260 struct nsproxy;
 261 struct proc_ns_operations {
 262         const char *name;
 263         int type;
 264         void *(*get)(struct task_struct *task);
 265         void (*put)(void *ns);
 266         int (*install)(struct nsproxy *nsproxy, void *ns);
 267 };
 268 extern const struct proc_ns_operations netns_operations;
 269 extern const struct proc_ns_operations utsns_operations;
 270 extern const struct proc_ns_operations ipcns_operations;
 271
 272 union proc_op {
 273         int (*proc_get_link)(struct inode *, struct path *);
 274         int (*proc_read)(struct task_struct *task, char *page);
 275         int (*proc_show)(struct seq_file *m,
 276                 struct pid_namespace *ns, struct pid *pid,
 277                 struct task_struct *task);
 278 };
 279
 280 struct ctl_table_header;
 281 struct ctl_table;
 282
 283 struct proc_inode {
 284         struct pid *pid;
 285         int fd;
 286         union proc_op op;
 287         struct proc_dir_entry *pde;
 288         struct ctl_table_header *sysctl;
 289         struct ctl_table *sysctl_entry;
 290         void *ns;
 291         const struct proc_ns_operations *ns_ops;
 292         struct inode vfs_inode;
 293 };
 294
 295 static inline struct proc_inode *PROC_I(const struct inode *inode)
 296 {
 297         return container_of(inode, struct proc_inode, vfs_inode);
 298 }
 299
 300 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 301 {
 302         return PROC_I(inode)->pde;
 303 }
 304
 305 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 306 {
 307         return pde->parent->data;
 308 }
 309
 310 struct proc_maps_private {
 311         struct pid *pid;
 312         struct task_struct *task;
 313 #ifdef CONFIG_MMU
 314         struct vm_area_struct *tail_vma;
 315 #endif
 316 };
 317
 318 #endif /* _LINUX_PROC_FS_H */