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 extern void proc_self_init(void);
  19 #ifdef CONFIG_PROC_SYSCTL
  20 extern int proc_sys_init(void);
  21 extern void sysctl_head_put(struct ctl_table_header *head);
  22 #else
  23 static inline void proc_sys_init(void) { }
  24 static inline void sysctl_head_put(struct ctl_table_header *head) { }
  25 #endif
  26 #ifdef CONFIG_NET
  27 extern int proc_net_init(void);
  28 #else
  29 static inline int proc_net_init(void) { return 0; }
  30 #endif
  31
  32 struct vmalloc_info {
  33         unsigned long   used;
  34         unsigned long   largest_chunk;
  35 };
  36
  37 #ifdef CONFIG_MMU
  38 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
  39 extern void get_vmalloc_info(struct vmalloc_info *vmi);
  40 #else
  41
  42 #define VMALLOC_TOTAL 0UL
  43 #define get_vmalloc_info(vmi)                   \
  44 do {                                            \
  45         (vmi)->used = 0;                        \
  46         (vmi)->largest_chunk = 0;               \
  47 } while(0)
  48 #endif
  49
  50 extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
  51                                 struct pid *pid, struct task_struct *task);
  52 extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
  53                                 struct pid *pid, struct task_struct *task);
  54 extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
  55                                 struct pid *pid, struct task_struct *task);
  56 extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
  57                                 struct pid *pid, struct task_struct *task);
  58 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
  59
  60 extern const struct file_operations proc_tid_children_operations;
  61 extern const struct file_operations proc_pid_maps_operations;
  62 extern const struct file_operations proc_tid_maps_operations;
  63 extern const struct file_operations proc_pid_numa_maps_operations;
  64 extern const struct file_operations proc_tid_numa_maps_operations;
  65 extern const struct file_operations proc_pid_smaps_operations;
  66 extern const struct file_operations proc_tid_smaps_operations;
  67 extern const struct file_operations proc_clear_refs_operations;
  68 extern const struct file_operations proc_pagemap_operations;
  69 extern const struct file_operations proc_net_operations;
  70 extern const struct inode_operations proc_net_inode_operations;
  71 extern const struct inode_operations proc_pid_link_inode_operations;
  72
  73 struct proc_maps_private {
  74         struct pid *pid;
  75         struct task_struct *task;
  76 #ifdef CONFIG_MMU
  77         struct vm_area_struct *tail_vma;
  78 #endif
  79 #ifdef CONFIG_NUMA
  80         struct mempolicy *task_mempolicy;
  81 #endif
  82 };
  83
  84 void proc_init_inodecache(void);
  85
  86 static inline struct pid *proc_pid(struct inode *inode)
  87 {
  88         return PROC_I(inode)->pid;
  89 }
  90
  91 static inline struct task_struct *get_proc_task(struct inode *inode)
  92 {
  93         return get_pid_task(proc_pid(inode), PIDTYPE_PID);
  94 }
  95
  96 static inline int proc_fd(struct inode *inode)
  97 {
  98         return PROC_I(inode)->fd;
  99 }
 100
 101 static inline int task_dumpable(struct task_struct *task)
 102 {
 103         int dumpable = 0;
 104         struct mm_struct *mm;
 105
 106         task_lock(task);
 107         mm = task->mm;
 108         if (mm)
 109                 dumpable = get_dumpable(mm);
 110         task_unlock(task);
 111         if (dumpable == SUID_DUMPABLE_ENABLED)
 112                 return 1;
 113         return 0;
 114 }
 115
 116 static inline int pid_delete_dentry(const struct dentry * dentry)
 117 {
 118         /* Is the task we represent dead?
 119          * If so, then don't put the dentry on the lru list,
 120          * kill it immediately.
 121          */
 122         return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
 123 }
 124
 125 static inline unsigned name_to_int(struct dentry *dentry)
 126 {
 127         const char *name = dentry->d_name.name;
 128         int len = dentry->d_name.len;
 129         unsigned n = 0;
 130
 131         if (len > 1 && *name == '0')
 132                 goto out;
 133         while (len-- > 0) {
 134                 unsigned c = *name++ - '0';
 135                 if (c > 9)
 136                         goto out;
 137                 if (n >= (~0U-9)/10)
 138                         goto out;
 139                 n *= 10;
 140                 n += c;
 141         }
 142         return n;
 143 out:
 144         return ~0U;
 145 }
 146
 147 struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
 148                 struct dentry *dentry);
 149 int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
 150                 filldir_t filldir);
 151
 152 struct pde_opener {
 153         struct inode *inode;
 154         struct file *file;
 155         int (*release)(struct inode *, struct file *);
 156         struct list_head lh;
 157 };
 158 void pde_users_dec(struct proc_dir_entry *pde);
 159
 160 extern spinlock_t proc_subdir_lock;
 161
 162 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
 163 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
 164 unsigned long task_vsize(struct mm_struct *);
 165 unsigned long task_statm(struct mm_struct *,
 166         unsigned long *, unsigned long *, unsigned long *, unsigned long *);
 167 void task_mem(struct seq_file *, struct mm_struct *);
 168
 169 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
 170 {
 171         atomic_inc(&pde->count);
 172         return pde;
 173 }
 174 void pde_put(struct proc_dir_entry *pde);
 175
 176 int proc_fill_super(struct super_block *);
 177 struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
 178 int proc_remount(struct super_block *sb, int *flags, char *data);
 179
 180 /*
 181  * These are generic /proc routines that use the internal
 182  * "struct proc_dir_entry" tree to traverse the filesystem.
 183  *
 184  * The /proc root directory has extended versions to take care
 185  * of the /proc/<pid> subdirectories.
 186  */
 187 int proc_readdir(struct file *, void *, filldir_t);
 188 struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
 189
 190
 191
 192 /* Lookups */
 193 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
 194                                 struct task_struct *, const void *);
 195 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
 196         const char *name, int len,
 197         instantiate_t instantiate, struct task_struct *task, const void *ptr);
 198 int pid_revalidate(struct dentry *dentry, unsigned int flags);
 199 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
 200 extern const struct dentry_operations pid_dentry_operations;
 201 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
 202 int proc_setattr(struct dentry *dentry, struct iattr *attr);
 203
 204 extern const struct inode_operations proc_ns_dir_inode_operations;
 205 extern const struct file_operations proc_ns_dir_operations;
 206