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 PROC_IPC_INIT_INO = 0xEFFFFFFFU, 33 PROC_UTS_INIT_INO = 0xEFFFFFFEU, 34 PROC_USER_INIT_INO = 0xEFFFFFFDU, 35 PROC_PID_INIT_INO = 0xEFFFFFFCU, 36 }; 37 38 /* 39 * This is not completely implemented yet. The idea is to 40 * create an in-memory tree (like the actual /proc filesystem 41 * tree) of these proc_dir_entries, so that we can dynamically 42 * add new files to /proc. 43 * 44 * The "next" pointer creates a linked list of one /proc directory, 45 * while parent/subdir create the directory structure (every 46 * /proc file has a parent, but "subdir" is NULL for all 47 * non-directory entries). 48 */ 49 50 typedef int (read_proc_t)(char *page, char **start, off_t off, 51 int count, int *eof, void *data); 52 typedef int (write_proc_t)(struct file *file, const char __user *buffer, 53 unsigned long count, void *data); 54 55 struct proc_dir_entry { 56 unsigned int low_ino; 57 umode_t mode; 58 nlink_t nlink; 59 kuid_t uid; 60 kgid_t gid; 61 loff_t size; 62 const struct inode_operations *proc_iops; 63 /* 64 * NULL ->proc_fops means "PDE is going away RSN" or 65 * "PDE is just created". In either case, e.g. ->read_proc won't be 66 * called because it's too late or too early, respectively. 67 * 68 * If you're allocating ->proc_fops dynamically, save a pointer 69 * somewhere. 70 */ 71 const struct file_operations *proc_fops; 72 struct proc_dir_entry *next, *parent, *subdir; 73 void *data; 74 read_proc_t *read_proc; 75 write_proc_t *write_proc; 76 atomic_t count; /* use count */ 77 int pde_users; /* number of callers into module in progress */ 78 struct completion *pde_unload_completion; 79 struct list_head pde_openers; /* who did ->open, but not ->release */ 80 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */ 81 u8 namelen; 82 char name[]; 83 }; 84 85 enum kcore_type { 86 KCORE_TEXT, 87 KCORE_VMALLOC, 88 KCORE_RAM, 89 KCORE_VMEMMAP, 90 KCORE_OTHER, 91 }; 92 93 struct kcore_list { 94 struct list_head list; 95 unsigned long addr; 96 size_t size; 97 int type; 98 }; 99 100 struct vmcore { 101 struct list_head list; 102 unsigned long long paddr; 103 unsigned long long size; 104 loff_t offset; 105 }; 106 107 #ifdef CONFIG_PROC_FS 108 109 extern void proc_root_init(void); 110 111 void proc_flush_task(struct task_struct *task); 112 113 extern struct proc_dir_entry *create_proc_entry(const char *name, umode_t mode, 114 struct proc_dir_entry *parent); 115 struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, 116 struct proc_dir_entry *parent, 117 const struct file_operations *proc_fops, 118 void *data); 119 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent); 120 121 struct pid_namespace; 122 123 extern int pid_ns_prepare_proc(struct pid_namespace *ns); 124 extern void pid_ns_release_proc(struct pid_namespace *ns); 125 126 /* 127 * proc_tty.c 128 */ 129 struct tty_driver; 130 #ifdef CONFIG_TTY 131 extern void proc_tty_init(void); 132 #else 133 static inline void proc_tty_init(void) 134 { } 135 #endif 136 extern void proc_tty_register_driver(struct tty_driver *driver); 137 extern void proc_tty_unregister_driver(struct tty_driver *driver); 138 139 /* 140 * proc_devtree.c 141 */ 142 #ifdef CONFIG_PROC_DEVICETREE 143 struct device_node; 144 struct property; 145 extern void proc_device_tree_init(void); 146 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *); 147 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop); 148 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde, 149 struct property *prop); 150 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde, 151 struct property *newprop, 152 struct property *oldprop); 153 #endif /* CONFIG_PROC_DEVICETREE */ 154 155 extern struct proc_dir_entry *proc_symlink(const char *, 156 struct proc_dir_entry *, const char *); 157 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *); 158 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, 159 struct proc_dir_entry *parent); 160 161 static inline struct proc_dir_entry *proc_create(const char *name, umode_t mode, 162 struct proc_dir_entry *parent, const struct file_operations *proc_fops) 163 { 164 return proc_create_data(name, mode, parent, proc_fops, NULL); 165 } 166 167 static inline struct proc_dir_entry *create_proc_read_entry(const char *name, 168 umode_t mode, struct proc_dir_entry *base, 169 read_proc_t *read_proc, void * data) 170 { 171 struct proc_dir_entry *res=create_proc_entry(name,mode,base); 172 if (res) { 173 res->read_proc=read_proc; 174 res->data=data; 175 } 176 return res; 177 } 178 179 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name, 180 struct proc_dir_entry *parent); 181 182 extern struct file *proc_ns_fget(int fd); 183 extern bool proc_ns_inode(struct inode *inode); 184 185 extern int proc_alloc_inum(unsigned int *pino); 186 extern void proc_free_inum(unsigned int inum); 187 #else 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 umode_t mode, struct proc_dir_entry *parent) { return NULL; } 195 196 #define proc_create(name, mode, parent, fops) ({ (void)(mode), NULL; }) 197 198 static inline struct proc_dir_entry *proc_create_data(const char *name, 199 umode_t mode, struct proc_dir_entry *parent, 200 const struct file_operations *proc_fops, void *data) 201 { 202 return NULL; 203 } 204 #define remove_proc_entry(name, parent) do {} while (0) 205 206 static inline struct proc_dir_entry *proc_symlink(const char *name, 207 struct proc_dir_entry *parent,const char *dest) {return NULL;} 208 static inline struct proc_dir_entry *proc_mkdir(const char *name, 209 struct proc_dir_entry *parent) {return NULL;} 210 static inline struct proc_dir_entry *proc_mkdir_mode(const char *name, 211 umode_t mode, struct proc_dir_entry *parent) { return NULL; } 212 213 static inline struct proc_dir_entry *create_proc_read_entry(const char *name, 214 umode_t mode, struct proc_dir_entry *base, 215 read_proc_t *read_proc, void * data) { return NULL; } 216 217 struct tty_driver; 218 static inline void proc_tty_register_driver(struct tty_driver *driver) {}; 219 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {}; 220 221 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) 222 { 223 return 0; 224 } 225 226 static inline void pid_ns_release_proc(struct pid_namespace *ns) 227 { 228 } 229 230 static inline struct file *proc_ns_fget(int fd) 231 { 232 return ERR_PTR(-EINVAL); 233 } 234 235 static inline bool proc_ns_inode(struct inode *inode) 236 { 237 return false; 238 } 239 240 static inline int proc_alloc_inum(unsigned int *inum) 241 { 242 *inum = 1; 243 return 0; 244 } 245 static inline void proc_free_inum(unsigned int inum) 246 { 247 } 248 #endif /* CONFIG_PROC_FS */ 249 250 #if !defined(CONFIG_PROC_KCORE) 251 static inline void 252 kclist_add(struct kcore_list *new, void *addr, size_t size, int type) 253 { 254 } 255 #else 256 extern void kclist_add(struct kcore_list *, void *, size_t, int type); 257 #endif 258 259 struct nsproxy; 260 struct proc_ns_operations { 261 const char *name; 262 int type; 263 void *(*get)(struct task_struct *task); 264 void (*put)(void *ns); 265 int (*install)(struct nsproxy *nsproxy, void *ns); 266 unsigned int (*inum)(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 extern const struct proc_ns_operations pidns_operations; 272 extern const struct proc_ns_operations userns_operations; 273 extern const struct proc_ns_operations mntns_operations; 274 275 union proc_op { 276 int (*proc_get_link)(struct dentry *, struct path *); 277 int (*proc_read)(struct task_struct *task, char *page); 278 int (*proc_show)(struct seq_file *m, 279 struct pid_namespace *ns, struct pid *pid, 280 struct task_struct *task); 281 }; 282 283 struct ctl_table_header; 284 struct ctl_table; 285 286 struct proc_inode { 287 struct pid *pid; 288 int fd; 289 union proc_op op; 290 struct proc_dir_entry *pde; 291 struct ctl_table_header *sysctl; 292 struct ctl_table *sysctl_entry; 293 void *ns; 294 const struct proc_ns_operations *ns_ops; 295 struct inode vfs_inode; 296 }; 297 298 static inline struct proc_inode *PROC_I(const struct inode *inode) 299 { 300 return container_of(inode, struct proc_inode, vfs_inode); 301 } 302 303 static inline struct proc_dir_entry *PDE(const struct inode *inode) 304 { 305 return PROC_I(inode)->pde; 306 } 307 308 static inline struct net *PDE_NET(struct proc_dir_entry *pde) 309 { 310 return pde->parent->data; 311 } 312 313 #include <linux/signal.h> 314 315 void render_sigset_t(struct seq_file *m, const char *header, sigset_t *set); 316 #endif /* _LINUX_PROC_FS_H */ 317