linux/include/linux/proc_fs.h
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   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
  10struct net;
  11struct completion;
  12struct 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
  30enum {
  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
  50typedef int (read_proc_t)(char *page, char **start, off_t off,
  51                          int count, int *eof, void *data);
  52typedef int (write_proc_t)(struct file *file, const char __user *buffer,
  53                           unsigned long count, void *data);
  54
  55struct 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
  85enum kcore_type {
  86        KCORE_TEXT,
  87        KCORE_VMALLOC,
  88        KCORE_RAM,
  89        KCORE_VMEMMAP,
  90        KCORE_OTHER,
  91};
  92
  93struct kcore_list {
  94        struct list_head list;
  95        unsigned long addr;
  96        size_t size;
  97        int type;
  98};
  99
 100struct 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
 109extern void proc_root_init(void);
 110
 111void proc_flush_task(struct task_struct *task);
 112
 113extern struct proc_dir_entry *create_proc_entry(const char *name, umode_t mode,
 114                                                struct proc_dir_entry *parent);
 115struct 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);
 119extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 120extern int remove_proc_subtree(const char *name, struct proc_dir_entry *parent);
 121
 122struct pid_namespace;
 123
 124extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 125extern void pid_ns_release_proc(struct pid_namespace *ns);
 126
 127/*
 128 * proc_tty.c
 129 */
 130struct tty_driver;
 131#ifdef CONFIG_TTY
 132extern void proc_tty_init(void);
 133#else
 134static inline void proc_tty_init(void)
 135{ }
 136#endif
 137extern void proc_tty_register_driver(struct tty_driver *driver);
 138extern void proc_tty_unregister_driver(struct tty_driver *driver);
 139
 140/*
 141 * proc_devtree.c
 142 */
 143#ifdef CONFIG_PROC_DEVICETREE
 144struct device_node;
 145struct property;
 146extern void proc_device_tree_init(void);
 147extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 148extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 149extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 150                                         struct property *prop);
 151extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 152                                         struct property *newprop,
 153                                         struct property *oldprop);
 154#endif /* CONFIG_PROC_DEVICETREE */
 155
 156extern struct proc_dir_entry *proc_symlink(const char *,
 157                struct proc_dir_entry *, const char *);
 158extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 159extern struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode,
 160                        struct proc_dir_entry *parent);
 161
 162static inline struct proc_dir_entry *proc_create(const char *name, umode_t mode,
 163        struct proc_dir_entry *parent, const struct file_operations *proc_fops)
 164{
 165        return proc_create_data(name, mode, parent, proc_fops, NULL);
 166}
 167
 168static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 169        umode_t mode, struct proc_dir_entry *base, 
 170        read_proc_t *read_proc, void * data)
 171{
 172        struct proc_dir_entry *res=create_proc_entry(name,mode,base);
 173        if (res) {
 174                res->read_proc=read_proc;
 175                res->data=data;
 176        }
 177        return res;
 178}
 179 
 180extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 181        struct proc_dir_entry *parent);
 182
 183extern struct file *proc_ns_fget(int fd);
 184extern bool proc_ns_inode(struct inode *inode);
 185
 186extern int proc_alloc_inum(unsigned int *pino);
 187extern void proc_free_inum(unsigned int inum);
 188#else
 189
 190static inline void proc_flush_task(struct task_struct *task)
 191{
 192}
 193
 194static inline struct proc_dir_entry *create_proc_entry(const char *name,
 195        umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 196
 197#define proc_create(name, mode, parent, fops)  ({ (void)(mode), NULL; })
 198
 199static inline struct proc_dir_entry *proc_create_data(const char *name,
 200        umode_t mode, struct proc_dir_entry *parent,
 201        const struct file_operations *proc_fops, void *data)
 202{
 203        return NULL;
 204}
 205#define remove_proc_entry(name, parent) do {} while (0)
 206#define remove_proc_subtree(name, parent) do {} while (0)
 207
 208static inline struct proc_dir_entry *proc_symlink(const char *name,
 209                struct proc_dir_entry *parent,const char *dest) {return NULL;}
 210static inline struct proc_dir_entry *proc_mkdir(const char *name,
 211        struct proc_dir_entry *parent) {return NULL;}
 212static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
 213        umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 214
 215static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
 216        umode_t mode, struct proc_dir_entry *base, 
 217        read_proc_t *read_proc, void * data) { return NULL; }
 218
 219struct tty_driver;
 220static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 221static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 222
 223static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 224{
 225        return 0;
 226}
 227
 228static inline void pid_ns_release_proc(struct pid_namespace *ns)
 229{
 230}
 231
 232static inline struct file *proc_ns_fget(int fd)
 233{
 234        return ERR_PTR(-EINVAL);
 235}
 236
 237static inline bool proc_ns_inode(struct inode *inode)
 238{
 239        return false;
 240}
 241
 242static inline int proc_alloc_inum(unsigned int *inum)
 243{
 244        *inum = 1;
 245        return 0;
 246}
 247static inline void proc_free_inum(unsigned int inum)
 248{
 249}
 250#endif /* CONFIG_PROC_FS */
 251
 252#if !defined(CONFIG_PROC_KCORE)
 253static inline void
 254kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
 255{
 256}
 257#else
 258extern void kclist_add(struct kcore_list *, void *, size_t, int type);
 259#endif
 260
 261struct nsproxy;
 262struct proc_ns_operations {
 263        const char *name;
 264        int type;
 265        void *(*get)(struct task_struct *task);
 266        void (*put)(void *ns);
 267        int (*install)(struct nsproxy *nsproxy, void *ns);
 268        unsigned int (*inum)(void *ns);
 269};
 270extern const struct proc_ns_operations netns_operations;
 271extern const struct proc_ns_operations utsns_operations;
 272extern const struct proc_ns_operations ipcns_operations;
 273extern const struct proc_ns_operations pidns_operations;
 274extern const struct proc_ns_operations userns_operations;
 275extern const struct proc_ns_operations mntns_operations;
 276
 277union proc_op {
 278        int (*proc_get_link)(struct dentry *, struct path *);
 279        int (*proc_read)(struct task_struct *task, char *page);
 280        int (*proc_show)(struct seq_file *m,
 281                struct pid_namespace *ns, struct pid *pid,
 282                struct task_struct *task);
 283};
 284
 285struct ctl_table_header;
 286struct ctl_table;
 287
 288struct proc_inode {
 289        struct pid *pid;
 290        int fd;
 291        union proc_op op;
 292        struct proc_dir_entry *pde;
 293        struct ctl_table_header *sysctl;
 294        struct ctl_table *sysctl_entry;
 295        void *ns;
 296        const struct proc_ns_operations *ns_ops;
 297        struct inode vfs_inode;
 298};
 299
 300static inline struct proc_inode *PROC_I(const struct inode *inode)
 301{
 302        return container_of(inode, struct proc_inode, vfs_inode);
 303}
 304
 305static inline struct proc_dir_entry *PDE(const struct inode *inode)
 306{
 307        return PROC_I(inode)->pde;
 308}
 309
 310static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 311{
 312        return pde->parent->data;
 313}
 314
 315#include <linux/signal.h>
 316
 317void render_sigset_t(struct seq_file *m, const char *header, sigset_t *set);
 318#endif /* _LINUX_PROC_FS_H */
 319
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