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 kuid_t uid; 56 kgid_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 */ 294