fs/proc/internal.h

   1 /* internal.h: internal procfs definitions
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/sched.h>
  13 #include <linux/proc_fs.h>
  14 struct  ctl_table_header;
  15
  16 extern struct proc_dir_entry proc_root;
  17 #ifdef CONFIG_PROC_SYSCTL
  18 extern int proc_sys_init(void);
  19 extern void sysctl_head_put(struct ctl_table_header *head);
  20 #else
  21 static inline void proc_sys_init(void) { }
  22 static inline void sysctl_head_put(struct ctl_table_header *head) { }
  23 #endif
  24 #ifdef CONFIG_NET
  25 extern int proc_net_init(void);
  26 #else
  27 static inline int proc_net_init(void) { return 0; }
  28 #endif
  29
  30 struct vmalloc_info {
  31         unsigned long   used;
  32         unsigned long   largest_chunk;
  33 };
  34
  35 #ifdef CONFIG_MMU
  36 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
  37 extern void get_vmalloc_info(struct vmalloc_info *vmi);
  38 #else
  39
  40 #define VMALLOC_TOTAL 0UL
  41 #define get_vmalloc_info(vmi)                   \
  42 do {                                            \
  43         (vmi)->used = 0;                        \
  44         (vmi)->largest_chunk = 0;               \
  45 } while(0)
  46 #endif
  47
  48 extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
  49                                 struct pid *pid, struct task_struct *task);
  50 extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
  51                                 struct pid *pid, struct task_struct *task);
  52 extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
  53                                 struct pid *pid, struct task_struct *task);
  54 extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
  55                                 struct pid *pid, struct task_struct *task);
  56 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
  57
  58 extern const struct file_operations proc_tid_children_operations;
  59 extern const struct file_operations proc_pid_maps_operations;
  60 extern const struct file_operations proc_tid_maps_operations;
  61 extern const struct file_operations proc_pid_numa_maps_operations;
  62 extern const struct file_operations proc_tid_numa_maps_operations;
  63 extern const struct file_operations proc_pid_smaps_operations;
  64 extern const struct file_operations proc_tid_smaps_operations;
  65 extern const struct file_operations proc_clear_refs_operations;
  66 extern const struct file_operations proc_pagemap_operations;
  67 extern const struct file_operations proc_net_operations;
  68 extern const struct inode_operations proc_net_inode_operations;
  69 extern const struct inode_operations proc_pid_link_inode_operations;
  70
  71 struct proc_maps_private {
  72         struct pid *pid;
  73         struct task_struct *task;
  74 #ifdef CONFIG_MMU
  75         struct vm_area_struct *tail_vma;
  76 #endif
  77 };
  78
  79 void proc_init_inodecache(void);
  80
  81 static inline struct pid *proc_pid(struct inode *inode)
  82 {
  83         return PROC_I(inode)->pid;
  84 }
  85
  86 static inline struct task_struct *get_proc_task(struct inode *inode)
  87 {
  88         return get_pid_task(proc_pid(inode), PIDTYPE_PID);
  89 }
  90
  91 static inline int proc_fd(struct inode *inode)
  92 {
  93         return PROC_I(inode)->fd;
  94 }
  95
  96 static inline int task_dumpable(struct task_struct *task)
  97 {
  98         int dumpable = 0;
  99         struct mm_struct *mm;
 100
 101         task_lock(task);
 102         mm = task->mm;
 103         if (mm)
 104                 dumpable = get_dumpable(mm);
 105         task_unlock(task);
 106         if (dumpable == SUID_DUMPABLE_ENABLED)
 107                 return 1;
 108         return 0;
 109 }
 110
 111 static inline int pid_delete_dentry(const struct dentry * dentry)
 112 {
 113         /* Is the task we represent dead?
 114          * If so, then don't put the dentry on the lru list,
 115          * kill it immediately.
 116          */
 117         return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
 118 }
 119
 120 static inline unsigned name_to_int(struct dentry *dentry)
 121 {
 122         const char *name = dentry->d_name.name;
 123         int len = dentry->d_name.len;
 124         unsigned n = 0;
 125
 126         if (len > 1 && *name == '0')
 127                 goto out;
 128         while (len-- > 0) {
 129                 unsigned c = *name++ - '0';
 130                 if (c > 9)
 131                         goto out;
 132                 if (n >= (~0U-9)/10)
 133                         goto out;
 134                 n *= 10;
 135                 n += c;
 136         }
 137         return n;
 138 out:
 139         return ~0U;
 140 }
 141
 142 struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
 143                 struct dentry *dentry);
 144 int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
 145                 filldir_t filldir);
 146
 147 struct pde_opener {
 148         struct inode *inode;
 149         struct file *file;
 150         int (*release)(struct inode *, struct file *);
 151         struct list_head lh;
 152 };
 153 void pde_users_dec(struct proc_dir_entry *pde);
 154
 155 extern spinlock_t proc_subdir_lock;
 156
 157 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
 158 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 159 unsigned long task_vsize(struct mm_struct *);
 160 unsigned long task_statm(struct mm_struct *,
 161         unsigned long *, unsigned long *, unsigned long *, unsigned long *);
 162 void task_mem(struct seq_file *, struct mm_struct *);
 163
 164 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
 165 {
 166         atomic_inc(&pde->count);
 167         return pde;
 168 }
 169 void pde_put(struct proc_dir_entry *pde);
 170
 171 int proc_fill_super(struct super_block *);
 172 struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
 173 int proc_remount(struct super_block *sb, int *flags, char *data);
 174
 175 /*
 176  * These are generic /proc routines that use the internal
 177  * "struct proc_dir_entry" tree to traverse the filesystem.
 178  *
 179  * The /proc root directory has extended versions to take care
 180  * of the /proc/<pid> subdirectories.
 181  */
 182 int proc_readdir(struct file *, void *, filldir_t);
 183 struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
 184
 185
 186
 187 /* Lookups */
 188 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
 189                                 struct task_struct *, const void *);
 190 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
 191         const char *name, int len,
 192         instantiate_t instantiate, struct task_struct *task, const void *ptr);
 193 int pid_revalidate(struct dentry *dentry, unsigned int flags);
 194 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
 195 extern const struct dentry_operations pid_dentry_operations;
 196 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
 197 int proc_setattr(struct dentry *dentry, struct iattr *attr);
 198
 199 extern const struct inode_operations proc_ns_dir_inode_operations;
 200 extern const struct file_operations proc_ns_dir_operations;
 201