1 #ifndef _LINUX_PROC_FS_H
2 #define _LINUX_PROC_FS_H
4 #include <linux/slab.h>
6 #include <linux/spinlock.h>
7 #include <linux/magic.h>
8 #include <linux/atomic.h>
9 #include <linux/proc_ns.h>
16 * The proc filesystem constants/structures
20 * Offset of the first process in the /proc root directory..
22 #define FIRST_PROCESS_ENTRY 256
24 /* Worst case buffer size needed for holding an integer. */
25 #define PROC_NUMBUF 13
28 * This is not completely implemented yet. The idea is to
29 * create an in-memory tree (like the actual /proc filesystem
30 * tree) of these proc_dir_entries, so that we can dynamically
31 * add new files to /proc.
33 * The "next" pointer creates a linked list of one /proc directory,
34 * while parent/subdir create the directory structure (every
35 * /proc file has a parent, but "subdir" is NULL for all
36 * non-directory entries).
39 struct proc_dir_entry {
46 const struct inode_operations *proc_iops;
47 const struct file_operations *proc_fops;
48 struct proc_dir_entry *next, *parent, *subdir;
50 atomic_t count; /* use count */
51 atomic_t in_use; /* number of callers into module in progress; */
52 /* negative -> it's going away RSN */
53 struct completion *pde_unload_completion;
54 struct list_head pde_openers; /* who did ->open, but not ->release */
55 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
62 extern void proc_root_init(void);
64 void proc_flush_task(struct task_struct *task);
66 struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
67 struct proc_dir_entry *parent,
68 const struct file_operations *proc_fops,
70 extern void proc_remove(struct proc_dir_entry *);
71 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
72 extern int remove_proc_subtree(const char *name, struct proc_dir_entry *parent);
74 extern struct proc_dir_entry *proc_symlink(const char *,
75 struct proc_dir_entry *, const char *);
76 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
77 extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
78 struct proc_dir_entry *, void *);
79 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode,
80 struct proc_dir_entry *parent);
82 static inline struct proc_dir_entry *proc_create(const char *name, umode_t mode,
83 struct proc_dir_entry *parent, const struct file_operations *proc_fops)
85 return proc_create_data(name, mode, parent, proc_fops, NULL);
88 extern void proc_set_size(struct proc_dir_entry *, loff_t);
89 extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
90 extern void *PDE_DATA(const struct inode *);
91 extern void *proc_get_parent_data(const struct inode *);
94 static inline void proc_flush_task(struct task_struct *task)
98 #define proc_create(name, mode, parent, fops) ({ (void)(mode), NULL; })
100 static inline struct proc_dir_entry *proc_create_data(const char *name,
101 umode_t mode, struct proc_dir_entry *parent,
102 const struct file_operations *proc_fops, void *data)
106 static inline void proc_remove(struct proc_dir_entry *de) {}
107 #define remove_proc_entry(name, parent) do {} while (0)
108 #define remove_proc_subtree(name, parent) do {} while (0)
110 static inline struct proc_dir_entry *proc_symlink(const char *name,
111 struct proc_dir_entry *parent,const char *dest) {return NULL;}
112 static inline struct proc_dir_entry *proc_mkdir(const char *name,
113 struct proc_dir_entry *parent) {return NULL;}
114 static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
115 umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
116 static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
117 umode_t mode, struct proc_dir_entry *parent) { return NULL; }
118 static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
119 static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
120 static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
122 #endif /* CONFIG_PROC_FS */
126 int (*proc_get_link)(struct dentry *, struct path *);
127 int (*proc_read)(struct task_struct *task, char *page);
128 int (*proc_show)(struct seq_file *m,
129 struct pid_namespace *ns, struct pid *pid,
130 struct task_struct *task);
133 struct ctl_table_header;
140 struct proc_dir_entry *pde;
141 struct ctl_table_header *sysctl;
142 struct ctl_table *sysctl_entry;
144 struct inode vfs_inode;
147 static inline struct proc_dir_entry *proc_net_mkdir(
148 struct net *net, const char *name, struct proc_dir_entry *parent)
150 return proc_mkdir_data(name, 0, parent, net);
153 #endif /* _LINUX_PROC_FS_H */