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 #include <linux/binfmts.h>
  15 struct  ctl_table_header;
  16 struct  mempolicy;
  17
  18 extern struct proc_dir_entry proc_root;
  19 extern void proc_self_init(void);
  20 #ifdef CONFIG_PROC_SYSCTL
  21 extern int proc_sys_init(void);
  22 extern void sysctl_head_put(struct ctl_table_header *head);
  23 #else
  24 static inline void proc_sys_init(void) { }
  25 static inline void sysctl_head_put(struct ctl_table_header *head) { }
  26 #endif
  27 #ifdef CONFIG_NET
  28 extern int proc_net_init(void);
  29 #else
  30 static inline int proc_net_init(void) { return 0; }
  31 #endif
  32
  33 struct vmalloc_info {
  34         unsigned long   used;
  35         unsigned long   largest_chunk;
  36 };
  37
  38 #ifdef CONFIG_MMU
  39 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
  40 extern void get_vmalloc_info(struct vmalloc_info *vmi);
  41 #else
  42
  43 #define VMALLOC_TOTAL 0UL
  44 #define get_vmalloc_info(vmi)                   \
  45 do {                                            \
  46         (vmi)->used = 0;                        \
  47         (vmi)->largest_chunk = 0;               \
  48 } while(0)
  49 #endif
  50
  51 extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
  52                                 struct pid *pid, struct task_struct *task);
  53 extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
  54                                 struct pid *pid, struct task_struct *task);
  55 extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
  56                                 struct pid *pid, struct task_struct *task);
  57 extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
  58                                 struct pid *pid, struct task_struct *task);
  59 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
  60
  61 extern const struct file_operations proc_tid_children_operations;
  62 extern const struct file_operations proc_pid_maps_operations;
  63 extern const struct file_operations proc_tid_maps_operations;
  64 extern const struct file_operations proc_pid_numa_maps_operations;
  65 extern const struct file_operations proc_tid_numa_maps_operations;
  66 extern const struct file_operations proc_pid_smaps_operations;
  67 extern const struct file_operations proc_tid_smaps_operations;
  68 extern const struct file_operations proc_clear_refs_operations;
  69 extern const struct file_operations proc_pagemap_operations;
  70 extern const struct file_operations proc_net_operations;
  71 extern const struct inode_operations proc_net_inode_operations;
  72 extern const struct inode_operations proc_pid_link_inode_operations;
  73
  74 struct proc_maps_private {
  75         struct pid *pid;
  76         struct task_struct *task;
  77 #ifdef CONFIG_MMU
  78         struct vm_area_struct *tail_vma;
  79 #endif
  80 #ifdef CONFIG_NUMA
  81         struct mempolicy *task_mempolicy;
  82 #endif
  83 };
  84
  85 void proc_init_inodecache(void);
  86
  87 static inline struct pid *proc_pid(struct inode *inode)
  88 {
  89         return PROC_I(inode)->pid;
  90 }
  91
  92 static inline struct task_struct *get_proc_task(struct inode *inode)
  93 {
  94         return get_pid_task(proc_pid(inode), PIDTYPE_PID);
  95 }
  96
  97 static inline int task_dumpable(struct task_struct *task)
  98 {
  99         int dumpable = 0;
 100         struct mm_struct *mm;
 101
 102         task_lock(task);
 103         mm = task->mm;
 104         if (mm)
 105                 dumpable = get_dumpable(mm);
 106         task_unlock(task);
 107         if (dumpable == SUID_DUMP_USER)
 108                 return 1;
 109         return 0;
 110 }
 111
 112 static inline unsigned name_to_int(struct dentry *dentry)
 113 {
 114         const char *name = dentry->d_name.name;
 115         int len = dentry->d_name.len;
 116         unsigned n = 0;
 117
 118         if (len > 1 && *name == '0')
 119                 goto out;
 120         while (len-- > 0) {
 121                 unsigned c = *name++ - '0';
 122                 if (c > 9)
 123                         goto out;
 124                 if (n >= (~0U-9)/10)
 125                         goto out;
 126                 n *= 10;
 127                 n += c;
 128         }
 129         return n;
 130 out:
 131         return ~0U;
 132 }
 133
 134 /*
 135  * base.c
 136  */
 137 extern int pid_delete_dentry(const struct dentry *);
 138
 139 struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
 140                 struct dentry *dentry);
 141 int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
 142                 filldir_t filldir);
 143
 144 struct pde_opener {
 145         struct file *file;
 146         struct list_head lh;
 147         int closing;
 148         struct completion *c;
 149 };
 150
 151 void proc_entry_rundown(struct proc_dir_entry *);
 152
 153 extern spinlock_t proc_subdir_lock;
 154
 155 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
 156 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 157 unsigned long task_vsize(struct mm_struct *);
 158 unsigned long task_statm(struct mm_struct *,
 159         unsigned long *, unsigned long *, unsigned long *, unsigned long *);
 160 void task_mem(struct seq_file *, struct mm_struct *);
 161
 162 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
 163 {
 164         atomic_inc(&pde->count);
 165         return pde;
 166 }
 167 void pde_put(struct proc_dir_entry *pde);
 168
 169 int proc_fill_super(struct super_block *);
 170 struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
 171 int proc_remount(struct super_block *sb, int *flags, char *data);
 172
 173 /*
 174  * These are generic /proc routines that use the internal
 175  * "struct proc_dir_entry" tree to traverse the filesystem.
 176  *
 177  * The /proc root directory has extended versions to take care
 178  * of the /proc/<pid> subdirectories.
 179  */
 180 int proc_readdir(struct file *, void *, filldir_t);
 181 struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
 182
 183
 184
 185 /* Lookups */
 186 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
 187                                 struct task_struct *, const void *);
 188 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
 189         const char *name, int len,
 190         instantiate_t instantiate, struct task_struct *task, const void *ptr);
 191 int pid_revalidate(struct dentry *dentry, unsigned int flags);
 192 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
 193 extern const struct dentry_operations pid_dentry_operations;
 194 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
 195 int proc_setattr(struct dentry *dentry, struct iattr *attr);
 196
 197 extern const struct inode_operations proc_ns_dir_inode_operations;
 198 extern const struct file_operations proc_ns_dir_operations;
 199
 200 extern int proc_setup_self(struct super_block *);