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 struct  mempolicy;
  16
  17 extern struct proc_dir_entry proc_root;
  18 #ifdef CONFIG_PROC_SYSCTL
  19 extern int proc_sys_init(void);
  20 extern void sysctl_head_put(struct ctl_table_header *head);
  21 #else
  22 static inline void proc_sys_init(void) { }
  23 static inline void sysctl_head_put(struct ctl_table_header *head) { }
  24 #endif
  25 #ifdef CONFIG_NET
  26 extern int proc_net_init(void);
  27 #else
  28 static inline int proc_net_init(void) { return 0; }
  29 #endif
  30
  31 struct vmalloc_info {
  32         unsigned long   used;
  33         unsigned long   largest_chunk;
  34 };
  35
  36 #ifdef CONFIG_MMU
  37 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
  38 extern void get_vmalloc_info(struct vmalloc_info *vmi);
  39 #else
  40
  41 #define VMALLOC_TOTAL 0UL
  42 #define get_vmalloc_info(vmi)                   \
  43 do {                                            \
  44         (vmi)->used = 0;                        \
  45         (vmi)->largest_chunk = 0;               \
  46 } while(0)
  47 #endif
  48
  49 extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
  50                                 struct pid *pid, struct task_struct *task);
  51 extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
  52                                 struct pid *pid, struct task_struct *task);
  53 extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
  54                                 struct pid *pid, struct task_struct *task);
  55 extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
  56                                 struct pid *pid, struct task_struct *task);
  57 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
  58
  59 extern const struct file_operations proc_tid_children_operations;
  60 extern const struct file_operations proc_pid_maps_operations;
  61 extern const struct file_operations proc_tid_maps_operations;
  62 extern const struct file_operations proc_pid_numa_maps_operations;
  63 extern const struct file_operations proc_tid_numa_maps_operations;
  64 extern const struct file_operations proc_pid_smaps_operations;
  65 extern const struct file_operations proc_tid_smaps_operations;
  66 extern const struct file_operations proc_clear_refs_operations;
  67 extern const struct file_operations proc_pagemap_operations;
  68 extern const struct file_operations proc_net_operations;
  69 extern const struct inode_operations proc_net_inode_operations;
  70 extern const struct inode_operations proc_pid_link_inode_operations;
  71
  72 struct proc_maps_private {
  73         struct pid *pid;
  74         struct task_struct *task;
  75 #ifdef CONFIG_MMU
  76         struct vm_area_struct *tail_vma;
  77 #endif
  78 #ifdef CONFIG_NUMA
  79         struct mempolicy *task_mempolicy;
  80 #endif
  81 };
  82
  83 void proc_init_inodecache(void);
  84
  85 static inline struct pid *proc_pid(struct inode *inode)
  86 {
  87         return PROC_I(inode)->pid;
  88 }
  89
  90 static inline struct task_struct *get_proc_task(struct inode *inode)
  91 {
  92         return get_pid_task(proc_pid(inode), PIDTYPE_PID);
  93 }
  94
  95 static inline int proc_fd(struct inode *inode)
  96 {
  97         return PROC_I(inode)->fd;
  98 }
  99
 100 static inline int task_dumpable(struct task_struct *task)
 101 {
 102         int dumpable = 0;
 103         struct mm_struct *mm;
 104
 105         task_lock(task);
 106         mm = task->mm;
 107         if (mm)
 108                 dumpable = get_dumpable(mm);
 109         task_unlock(task);
 110         if (dumpable == SUID_DUMPABLE_ENABLED)
 111                 return 1;
 112         return 0;
 113 }
 114
 115 static inline int pid_delete_dentry(const struct dentry * dentry)
 116 {
 117         /* Is the task we represent dead?
 118          * If so, then don't put the dentry on the lru list,
 119          * kill it immediately.
 120          */
 121         return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
 122 }
 123
 124 static inline unsigned name_to_int(struct dentry *dentry)
 125 {
 126         const char *name = dentry->d_name.name;
 127         int len = dentry->d_name.len;
 128         unsigned n = 0;
 129
 130         if (len > 1 && *name == '0')
 131                 goto out;
 132         while (len-- > 0) {
 133                 unsigned c = *name++ - '0';
 134                 if (c > 9)
 135                         goto out;
 136                 if (n >= (~0U-9)/10)
 137                         goto out;
 138                 n *= 10;
 139                 n += c;
 140         }
 141         return n;
 142 out:
 143         return ~0U;
 144 }
 145
 146 struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
 147                 struct dentry *dentry);
 148 int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
 149                 filldir_t filldir);
 150
 151 struct pde_opener {
 152         struct inode *inode;
 153         struct file *file;
 154         int (*release)(struct inode *, struct file *);
 155         struct list_head lh;
 156 };
 157 void pde_users_dec(struct proc_dir_entry *pde);
 158
 159 extern spinlock_t proc_subdir_lock;
 160
 161 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
 162 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 163 unsigned long task_vsize(struct mm_struct *);
 164 unsigned long task_statm(struct mm_struct *,
 165         unsigned long *, unsigned long *, unsigned long *, unsigned long *);
 166 void task_mem(struct seq_file *, struct mm_struct *);
 167
 168 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
 169 {
 170         atomic_inc(&pde->count);
 171         return pde;
 172 }
 173 void pde_put(struct proc_dir_entry *pde);
 174
 175 int proc_fill_super(struct super_block *);
 176 struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
 177 int proc_remount(struct super_block *sb, int *flags, char *data);
 178
 179 /*
 180  * These are generic /proc routines that use the internal
 181  * "struct proc_dir_entry" tree to traverse the filesystem.
 182  *
 183  * The /proc root directory has extended versions to take care
 184  * of the /proc/<pid> subdirectories.
 185  */
 186 int proc_readdir(struct file *, void *, filldir_t);
 187 struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
 188
 189
 190
 191 /* Lookups */
 192 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
 193                                 struct task_struct *, const void *);
 194 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
 195         const char *name, int len,
 196         instantiate_t instantiate, struct task_struct *task, const void *ptr);
 197 int pid_revalidate(struct dentry *dentry, unsigned int flags);
 198 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
 199 extern const struct dentry_operations pid_dentry_operations;
 200 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
 201 int proc_setattr(struct dentry *dentry, struct iattr *attr);
 202
 203 extern const struct inode_operations proc_ns_dir_inode_operations;
 204 extern const struct file_operations proc_ns_dir_operations;
 205