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 <linux/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         umode_t mode;
  54         nlink_t nlink;
  55         uid_t uid;
  56         gid_t gid;
  57         loff_t size;
  58         const struct inode_operations *proc_iops;
  59         /*
  60          * NULL ->proc_fops means "PDE is going away RSN" or
  61          * "PDE is just created". In either case, e.g. ->read_proc won't be
  62          * called because it's too late or too early, respectively.
  63          *
  64          * If you're allocating ->proc_fops dynamically, save a pointer
  65          * somewhere.
  66          */
  67         const struct file_operations *proc_fops;
  68         struct proc_dir_entry *next, *parent, *subdir;
  69         void *data;
  70         read_proc_t *read_proc;
  71         write_proc_t *write_proc;
  72         atomic_t count;         /* use count */
  73         int pde_users;  /* number of callers into module in progress */
  74         struct completion *pde_unload_completion;
  75         struct list_head pde_openers;   /* who did ->open, but not ->release */
  76         spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
  77         u8 namelen;
  78         char name[];
  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, umode_t mode,
 110                                                 struct proc_dir_entry *parent);
 111 struct proc_dir_entry *proc_create_data(const char *name, umode_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, umode_t mode,
 150                         struct proc_dir_entry *parent);
 151
 152 static inline struct proc_dir_entry *proc_create(const char *name, umode_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         umode_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, umode_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 extern struct file *proc_ns_fget(int fd);
 177
 178 #else
 179
 180 #define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 181 static inline void proc_net_remove(struct net *net, const char *name) {}
 182
 183 static inline void proc_flush_task(struct task_struct *task)
 184 {
 185 }
 186
 187 static inline struct proc_dir_entry *create_proc_entry(const char *name,
 188         umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 189 static inline struct proc_dir_entry *proc_create(const char *name,
 190         umode_t mode, struct proc_dir_entry *parent,
 191         const struct file_operations *proc_fops)
 192 {
 193         return NULL;
 194 }
 195 static inline struct proc_dir_entry *proc_create_data(const char *name,
 196         umode_t mode, struct proc_dir_entry *parent,
 197         const struct file_operations *proc_fops, void *data)
 198 {
 199         return NULL;
 200 }
 201 #define remove_proc_entry(name, parent) do {} while (0)
 202
 203 static inline struct proc_dir_entry *proc_symlink(const char *name,
 204                 struct proc_dir_entry *parent,const char *dest) {return NULL;}
 205 static inline struct proc_dir_entry *proc_mkdir(const char *name,
 206         struct proc_dir_entry *parent) {return NULL;}
 207 static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
 208         umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 209
 210 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 211         umode_t mode, struct proc_dir_entry *base,
 212         read_proc_t *read_proc, void * data) { return NULL; }
 213
 214 struct tty_driver;
 215 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 216 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 217
 218 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 219 {
 220         return 0;
 221 }
 222
 223 static inline void pid_ns_release_proc(struct pid_namespace *ns)
 224 {
 225 }
 226
 227 static inline struct file *proc_ns_fget(int fd)
 228 {
 229         return ERR_PTR(-EINVAL);
 230 }
 231
 232 #endif /* CONFIG_PROC_FS */
 233
 234 #if !defined(CONFIG_PROC_KCORE)
 235 static inline void
 236 kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
 237 {
 238 }
 239 #else
 240 extern void kclist_add(struct kcore_list *, void *, size_t, int type);
 241 #endif
 242
 243 struct nsproxy;
 244 struct proc_ns_operations {
 245         const char *name;
 246         int type;
 247         void *(*get)(struct task_struct *task);
 248         void (*put)(void *ns);
 249         int (*install)(struct nsproxy *nsproxy, void *ns);
 250 };
 251 extern const struct proc_ns_operations netns_operations;
 252 extern const struct proc_ns_operations utsns_operations;
 253 extern const struct proc_ns_operations ipcns_operations;
 254
 255 union proc_op {
 256         int (*proc_get_link)(struct dentry *, struct path *);
 257         int (*proc_read)(struct task_struct *task, char *page);
 258         int (*proc_show)(struct seq_file *m,
 259                 struct pid_namespace *ns, struct pid *pid,
 260                 struct task_struct *task);
 261 };
 262
 263 struct ctl_table_header;
 264 struct ctl_table;
 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 ctl_table_header *sysctl;
 272         struct ctl_table *sysctl_entry;
 273         void *ns;
 274         const struct proc_ns_operations *ns_ops;
 275         struct inode vfs_inode;
 276 };
 277
 278 static inline struct proc_inode *PROC_I(const struct inode *inode)
 279 {
 280         return container_of(inode, struct proc_inode, vfs_inode);
 281 }
 282
 283 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 284 {
 285         return PROC_I(inode)->pde;
 286 }
 287
 288 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 289 {
 290         return pde->parent->data;
 291 }
 292
 293 #endif /* _LINUX_PROC_FS_H */