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};
  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
  46typedef int (read_proc_t)(char *page, char **start, off_t off,
  47                          int count, int *eof, void *data);
  48typedef int (write_proc_t)(struct file *file, const char __user *buffer,
  49                           unsigned long count, void *data);
  50
  51struct 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
  81enum kcore_type {
  82        KCORE_TEXT,
  83        KCORE_VMALLOC,
  84        KCORE_RAM,
  85        KCORE_VMEMMAP,
  86        KCORE_OTHER,
  87};
  88
  89struct kcore_list {
  90        struct list_head list;
  91        unsigned long addr;
  92        size_t size;
  93        int type;
  94};
  95
  96struct 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
 105extern void proc_root_init(void);
 106
 107void proc_flush_task(struct task_struct *task);
 108
 109extern struct proc_dir_entry *create_proc_entry(const char *name, umode_t mode,
 110                                                struct proc_dir_entry *parent);
 111struct 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);
 115extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
 116
 117struct pid_namespace;
 118
 119extern int pid_ns_prepare_proc(struct pid_namespace *ns);
 120extern void pid_ns_release_proc(struct pid_namespace *ns);
 121
 122/*
 123 * proc_tty.c
 124 */
 125struct tty_driver;
 126extern void proc_tty_init(void);
 127extern void proc_tty_register_driver(struct tty_driver *driver);
 128extern void proc_tty_unregister_driver(struct tty_driver *driver);
 129
 130/*
 131 * proc_devtree.c
 132 */
 133#ifdef CONFIG_PROC_DEVICETREE
 134struct device_node;
 135struct property;
 136extern void proc_device_tree_init(void);
 137extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 138extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 139extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 140                                         struct property *prop);
 141extern 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
 146extern struct proc_dir_entry *proc_symlink(const char *,
 147                struct proc_dir_entry *, const char *);
 148extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
 149extern struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode,
 150                        struct proc_dir_entry *parent);
 151
 152static 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
 158static 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 
 170extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
 171        const char *name, umode_t mode, const struct file_operations *fops);
 172extern void proc_net_remove(struct net *net, const char *name);
 173extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 174        struct proc_dir_entry *parent);
 175
 176extern struct file *proc_ns_fget(int fd);
 177
 178#else
 179
 180#define proc_net_fops_create(net, name, mode, fops)  ({ (void)(mode), NULL; })
 181static inline void proc_net_remove(struct net *net, const char *name) {}
 182
 183static inline void proc_flush_task(struct task_struct *task)
 184{
 185}
 186
 187static inline struct proc_dir_entry *create_proc_entry(const char *name,
 188        umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 189static 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}
 195static 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
 203static inline struct proc_dir_entry *proc_symlink(const char *name,
 204                struct proc_dir_entry *parent,const char *dest) {return NULL;}
 205static inline struct proc_dir_entry *proc_mkdir(const char *name,
 206        struct proc_dir_entry *parent) {return NULL;}
 207static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
 208        umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 209
 210static 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
 214struct tty_driver;
 215static inline void proc_tty_register_driver(struct tty_driver *driver) {};
 216static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
 217
 218static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
 219{
 220        return 0;
 221}
 222
 223static inline void pid_ns_release_proc(struct pid_namespace *ns)
 224{
 225}
 226
 227static 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)
 235static inline void
 236kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
 237{
 238}
 239#else
 240extern void kclist_add(struct kcore_list *, void *, size_t, int type);
 241#endif
 242
 243struct nsproxy;
 244struct 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};
 251extern const struct proc_ns_operations netns_operations;
 252extern const struct proc_ns_operations utsns_operations;
 253extern const struct proc_ns_operations ipcns_operations;
 254
 255union 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
 263struct ctl_table_header;
 264struct ctl_table;
 265
 266struct 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
 278static inline struct proc_inode *PROC_I(const struct inode *inode)
 279{
 280        return container_of(inode, struct proc_inode, vfs_inode);
 281}
 282
 283static inline struct proc_dir_entry *PDE(const struct inode *inode)
 284{
 285        return PROC_I(inode)->pde;
 286}
 287
 288static 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
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