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 * "owner" is used to protect module 46 * from unloading while proc_dir_entry is in use 47 */ 48 49 typedef int (read_proc_t)(char *page, char **start, off_t off, 50 int count, int *eof, void *data); 51 typedef int (write_proc_t)(struct file *file, const char __user *buffer, 52 unsigned long count, void *data); 53 54 struct proc_dir_entry { 55 unsigned int low_ino; 56 unsigned short namelen; 57 const char *name; 58 mode_t mode; 59 nlink_t nlink; 60 uid_t uid; 61 gid_t gid; 62 loff_t size; 63 const struct inode_operations *proc_iops; 64 /* 65 * NULL ->proc_fops means "PDE is going away RSN" or 66 * "PDE is just created". In either case, e.g. ->read_proc won't be 67 * called because it's too late or too early, respectively. 68 * 69 * If you're allocating ->proc_fops dynamically, save a pointer 70 * somewhere. 71 */ 72 const struct file_operations *proc_fops; 73 struct module *owner; 74 struct proc_dir_entry *next, *parent, *subdir; 75 void *data; 76 read_proc_t *read_proc; 77 write_proc_t *write_proc; 78 atomic_t count; /* use count */ 79 int pde_users; /* number of callers into module in progress */ 80 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */ 81 struct completion *pde_unload_completion; 82 struct list_head pde_openers; /* who did ->open, but not ->release */ 83 }; 84 85 struct kcore_list { 86 struct kcore_list *next; 87 unsigned long addr; 88 size_t size; 89 }; 90 91 struct vmcore { 92 struct list_head list; 93 unsigned long long paddr; 94 unsigned long long size; 95 loff_t offset; 96 }; 97 98 #ifdef CONFIG_PROC_FS 99 100 extern struct proc_dir_entry *proc_root_kcore; 101 102 extern spinlock_t proc_subdir_lock; 103 104 extern void proc_root_init(void); 105 extern void proc_misc_init(void); 106 107 void proc_flush_task(struct task_struct *task); 108 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *); 109 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir); 110 unsigned long task_vsize(struct mm_struct *); 111 int task_statm(struct mm_struct *, int *, int *, int *, int *); 112 void task_mem(struct seq_file *, struct mm_struct *); 113 void clear_refs_smap(struct mm_struct *mm); 114 115 struct proc_dir_entry *de_get(struct proc_dir_entry *de); 116 void de_put(struct proc_dir_entry *de); 117 118 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode, 119 struct proc_dir_entry *parent); 120 struct proc_dir_entry *proc_create_data(const char *name, mode_t mode, 121 struct proc_dir_entry *parent, 122 const struct file_operations *proc_fops, 123 void *data); 124 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent); 125 126 extern struct vfsmount *proc_mnt; 127 struct pid_namespace; 128 extern int proc_fill_super(struct super_block *); 129 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *); 130 131 /* 132 * These are generic /proc routines that use the internal 133 * "struct proc_dir_entry" tree to traverse the filesystem. 134 * 135 * The /proc root directory has extended versions to take care 136 * of the /proc/<pid> subdirectories. 137 */ 138 extern int proc_readdir(struct file *, void *, filldir_t); 139 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *); 140 141 extern const struct file_operations proc_kcore_operations; 142 143 extern int pid_ns_prepare_proc(struct pid_namespace *ns); 144 extern void pid_ns_release_proc(struct pid_namespace *ns); 145 146 /* 147 * proc_tty.c 148 */ 149 struct tty_driver; 150 extern void proc_tty_init(void); 151 extern void proc_tty_register_driver(struct tty_driver *driver); 152 extern void proc_tty_unregister_driver(struct tty_driver *driver); 153 154 /* 155 * proc_devtree.c 156 */ 157 #ifdef CONFIG_PROC_DEVICETREE 158 struct device_node; 159 struct property; 160 extern void proc_device_tree_init(void); 161 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *); 162 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop); 163 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde, 164 struct property *prop); 165 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde, 166 struct property *newprop, 167 struct property *oldprop); 168 #endif /* CONFIG_PROC_DEVICETREE */ 169 170 extern struct proc_dir_entry *proc_symlink(const char *, 171 struct proc_dir_entry *, const char *); 172 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *); 173 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode, 174 struct proc_dir_entry *parent); 175 176 static inline struct proc_dir_entry *proc_create(const char *name, mode_t mode, 177 struct proc_dir_entry *parent, const struct file_operations *proc_fops) 178 { 179 return proc_create_data(name, mode, parent, proc_fops, NULL); 180 } 181 182 static inline struct proc_dir_entry *create_proc_read_entry(const char *name, 183 mode_t mode, struct proc_dir_entry *base, 184 read_proc_t *read_proc, void * data) 185 { 186 struct proc_dir_entry *res=create_proc_entry(name,mode,base); 187 if (res) { 188 res->read_proc=read_proc; 189 res->data=data; 190 } 191 return res; 192 } 193 194 extern struct proc_dir_entry *proc_net_fops_create(struct net *net, 195 const char *name, mode_t mode, const struct file_operations *fops); 196 extern void proc_net_remove(struct net *net, const char *name); 197 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name, 198 struct proc_dir_entry *parent); 199 200 /* While the {get|set|dup}_mm_exe_file functions are for mm_structs, they are 201 * only needed to implement /proc/<pid>|self/exe so we define them here. */ 202 extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); 203 extern struct file *get_mm_exe_file(struct mm_struct *mm); 204 extern void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm); 205 206 #else 207 208 #define proc_net_fops_create(net, name, mode, fops) ({ (void)(mode), NULL; }) 209 static inline void proc_net_remove(struct net *net, const char *name) {} 210 211 static inline void proc_flush_task(struct task_struct *task) 212 { 213 } 214 215 static inline struct proc_dir_entry *create_proc_entry(const char *name, 216 mode_t mode, struct proc_dir_entry *parent) { return NULL; } 217 static inline struct proc_dir_entry *proc_create(const char *name, 218 mode_t mode, struct proc_dir_entry *parent, 219 const struct file_operations *proc_fops) 220 { 221 return NULL; 222 } 223 static inline struct proc_dir_entry *proc_create_data(const char *name, 224 mode_t mode, struct proc_dir_entry *parent, 225 const struct file_operations *proc_fops, void *data) 226 { 227 return NULL; 228 } 229 #define remove_proc_entry(name, parent) do {} while (0) 230 231 static inline struct proc_dir_entry *proc_symlink(const char *name, 232 struct proc_dir_entry *parent,const char *dest) {return NULL;} 233 static inline struct proc_dir_entry *proc_mkdir(const char *name, 234 struct proc_dir_entry *parent) {return NULL;} 235 236 static inline struct proc_dir_entry *create_proc_read_entry(const char *name, 237 mode_t mode, struct proc_dir_entry *base, 238 read_proc_t *read_proc, void * data) { return NULL; } 239 240 struct tty_driver; 241 static inline void proc_tty_register_driver(struct tty_driver *driver) {}; 242 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {}; 243 244 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) 245 { 246 return 0; 247 } 248 249 static inline void pid_ns_release_proc(struct pid_namespace *ns) 250 { 251 } 252 253 static inline void set_mm_exe_file(struct mm_struct *mm, 254 struct file *new_exe_file) 255 {} 256 257 static inline struct file *get_mm_exe_file(struct mm_struct *mm) 258 { 259 return NULL; 260 } 261 262 static inline void dup_mm_exe_file(struct mm_struct *oldmm, 263 struct mm_struct *newmm) 264 {} 265 266 #endif /* CONFIG_PROC_FS */ 267 268 #if !defined(CONFIG_PROC_KCORE) 269 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size) 270 { 271 } 272 #else 273 extern void kclist_add(struct kcore_list *, void *, size_t); 274 #endif 275 276 union proc_op { 277 int (*proc_get_link)(struct inode *, struct path *); 278 int (*proc_read)(struct task_struct *task, char *page); 279 int (*proc_show)(struct seq_file *m, 280 struct pid_namespace *ns, struct pid *pid, 281 struct task_struct *task); 282 }; 283 284 struct ctl_table_header; 285 struct ctl_table; 286 287 struct proc_inode { 288 struct pid *pid; 289 int fd; 290 union proc_op op; 291 struct proc_dir_entry *pde; 292 struct ctl_table_header *sysctl; 293 struct ctl_table *sysctl_entry; 294 struct inode vfs_inode; 295 }; 296 297 static inline struct proc_inode *PROC_I(const struct inode *inode) 298 { 299 return container_of(inode, struct proc_inode, vfs_inode); 300 } 301 302 static inline struct proc_dir_entry *PDE(const struct inode *inode) 303 { 304 return PROC_I(inode)->pde; 305 } 306 307 static inline struct net *PDE_NET(struct proc_dir_entry *pde) 308 { 309 return pde->parent->data; 310 } 311 312 struct proc_maps_private { 313 struct pid *pid; 314 struct task_struct *task; 315 #ifdef CONFIG_MMU 316 struct vm_area_struct *tail_vma; 317 #endif 318 }; 319 320 #endif /* _LINUX_PROC_FS_H */ 321