fs/proc/internal.h

   1 /* 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/proc_fs.h>
  13 #include <linux/proc_ns.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/atomic.h>
  16 #include <linux/binfmts.h>
  17 #include <linux/sched/coredump.h>
  18 #include <linux/sched/task.h>
  19
  20 struct ctl_table_header;
  21 struct mempolicy;
  22
  23 /*
  24  * This is not completely implemented yet. The idea is to
  25  * create an in-memory tree (like the actual /proc filesystem
  26  * tree) of these proc_dir_entries, so that we can dynamically
  27  * add new files to /proc.
  28  *
  29  * parent/subdir are used for the directory structure (every /proc file has a
  30  * parent, but "subdir" is empty for all non-directory entries).
  31  * subdir_node is used to build the rb tree "subdir" of the parent.
  32  */
  33 struct proc_dir_entry {
  34         /*
  35          * number of callers into module in progress;
  36          * negative -> it's going away RSN
  37          */
  38         atomic_t in_use;
  39         atomic_t count;         /* use count */
  40         struct list_head pde_openers;   /* who did ->open, but not ->release */
  41         /* protects ->pde_openers and all struct pde_opener instances */
  42         spinlock_t pde_unload_lock;
  43         struct completion *pde_unload_completion;
  44         const struct inode_operations *proc_iops;
  45         const struct file_operations *proc_fops;
  46         void *data;
  47         unsigned int low_ino;
  48         nlink_t nlink;
  49         kuid_t uid;
  50         kgid_t gid;
  51         loff_t size;
  52         struct proc_dir_entry *parent;
  53         struct rb_root_cached subdir;
  54         struct rb_node subdir_node;
  55         umode_t mode;
  56         u8 namelen;
  57         char name[];
  58 } __randomize_layout;
  59
  60 union proc_op {
  61         int (*proc_get_link)(struct dentry *, struct path *);
  62         int (*proc_show)(struct seq_file *m,
  63                 struct pid_namespace *ns, struct pid *pid,
  64                 struct task_struct *task);
  65 };
  66
  67 struct proc_inode {
  68         struct pid *pid;
  69         unsigned int fd;
  70         union proc_op op;
  71         struct proc_dir_entry *pde;
  72         struct ctl_table_header *sysctl;
  73         struct ctl_table *sysctl_entry;
  74         struct hlist_node sysctl_inodes;
  75         const struct proc_ns_operations *ns_ops;
  76         struct inode vfs_inode;
  77 } __randomize_layout;
  78
  79 /*
  80  * General functions
  81  */
  82 static inline struct proc_inode *PROC_I(const struct inode *inode)
  83 {
  84         return container_of(inode, struct proc_inode, vfs_inode);
  85 }
  86
  87 static inline struct proc_dir_entry *PDE(const struct inode *inode)
  88 {
  89         return PROC_I(inode)->pde;
  90 }
  91
  92 static inline void *__PDE_DATA(const struct inode *inode)
  93 {
  94         return PDE(inode)->data;
  95 }
  96
  97 static inline struct pid *proc_pid(struct inode *inode)
  98 {
  99         return PROC_I(inode)->pid;
 100 }
 101
 102 static inline struct task_struct *get_proc_task(struct inode *inode)
 103 {
 104         return get_pid_task(proc_pid(inode), PIDTYPE_PID);
 105 }
 106
 107 void task_dump_owner(struct task_struct *task, umode_t mode,
 108                      kuid_t *ruid, kgid_t *rgid);
 109
 110 unsigned name_to_int(const struct qstr *qstr);
 111 /*
 112  * Offset of the first process in the /proc root directory..
 113  */
 114 #define FIRST_PROCESS_ENTRY 256
 115
 116 /* Worst case buffer size needed for holding an integer. */
 117 #define PROC_NUMBUF 13
 118
 119 /*
 120  * array.c
 121  */
 122 extern const struct file_operations proc_tid_children_operations;
 123
 124 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
 125                          struct pid *, struct task_struct *);
 126 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
 127                           struct pid *, struct task_struct *);
 128 extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
 129                            struct pid *, struct task_struct *);
 130 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
 131                           struct pid *, struct task_struct *);
 132
 133 /*
 134  * base.c
 135  */
 136 extern const struct dentry_operations pid_dentry_operations;
 137 extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
 138 extern int proc_setattr(struct dentry *, struct iattr *);
 139 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
 140 extern int pid_revalidate(struct dentry *, unsigned int);
 141 extern int pid_delete_dentry(const struct dentry *);
 142 extern int proc_pid_readdir(struct file *, struct dir_context *);
 143 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
 144 extern loff_t mem_lseek(struct file *, loff_t, int);
 145
 146 /* Lookups */
 147 typedef int instantiate_t(struct inode *, struct dentry *,
 148                                      struct task_struct *, const void *);
 149 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
 150                            instantiate_t, struct task_struct *, const void *);
 151
 152 /*
 153  * generic.c
 154  */
 155 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
 156 struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *);
 157 extern int proc_readdir(struct file *, struct dir_context *);
 158 int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *);
 159
 160 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
 161 {
 162         atomic_inc(&pde->count);
 163         return pde;
 164 }
 165 extern void pde_put(struct proc_dir_entry *);
 166
 167 static inline bool is_empty_pde(const struct proc_dir_entry *pde)
 168 {
 169         return S_ISDIR(pde->mode) && !pde->proc_iops;
 170 }
 171
 172 /*
 173  * inode.c
 174  */
 175 struct pde_opener {
 176         struct file *file;
 177         struct list_head lh;
 178         bool closing;
 179         struct completion *c;
 180 };
 181 extern const struct inode_operations proc_link_inode_operations;
 182
 183 extern const struct inode_operations proc_pid_link_inode_operations;
 184
 185 extern void proc_init_inodecache(void);
 186 void set_proc_pid_nlink(void);
 187 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
 188 extern int proc_fill_super(struct super_block *, void *data, int flags);
 189 extern void proc_entry_rundown(struct proc_dir_entry *);
 190
 191 /*
 192  * proc_namespaces.c
 193  */
 194 extern const struct inode_operations proc_ns_dir_inode_operations;
 195 extern const struct file_operations proc_ns_dir_operations;
 196
 197 /*
 198  * proc_net.c
 199  */
 200 extern const struct file_operations proc_net_operations;
 201 extern const struct inode_operations proc_net_inode_operations;
 202
 203 #ifdef CONFIG_NET
 204 extern int proc_net_init(void);
 205 #else
 206 static inline int proc_net_init(void) { return 0; }
 207 #endif
 208
 209 /*
 210  * proc_self.c
 211  */
 212 extern int proc_setup_self(struct super_block *);
 213
 214 /*
 215  * proc_thread_self.c
 216  */
 217 extern int proc_setup_thread_self(struct super_block *);
 218 extern void proc_thread_self_init(void);
 219
 220 /*
 221  * proc_sysctl.c
 222  */
 223 #ifdef CONFIG_PROC_SYSCTL
 224 extern int proc_sys_init(void);
 225 extern void proc_sys_evict_inode(struct inode *inode,
 226                                  struct ctl_table_header *head);
 227 #else
 228 static inline void proc_sys_init(void) { }
 229 static inline void proc_sys_evict_inode(struct  inode *inode,
 230                                         struct ctl_table_header *head) { }
 231 #endif
 232
 233 /*
 234  * proc_tty.c
 235  */
 236 #ifdef CONFIG_TTY
 237 extern void proc_tty_init(void);
 238 #else
 239 static inline void proc_tty_init(void) {}
 240 #endif
 241
 242 /*
 243  * root.c
 244  */
 245 extern struct proc_dir_entry proc_root;
 246 extern int proc_parse_options(char *options, struct pid_namespace *pid);
 247
 248 extern void proc_self_init(void);
 249 extern int proc_remount(struct super_block *, int *, char *);
 250
 251 /*
 252  * task_[no]mmu.c
 253  */
 254 struct mem_size_stats;
 255 struct proc_maps_private {
 256         struct inode *inode;
 257         struct task_struct *task;
 258         struct mm_struct *mm;
 259         struct mem_size_stats *rollup;
 260 #ifdef CONFIG_MMU
 261         struct vm_area_struct *tail_vma;
 262 #endif
 263 #ifdef CONFIG_NUMA
 264         struct mempolicy *task_mempolicy;
 265 #endif
 266 } __randomize_layout;
 267
 268 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
 269
 270 extern const struct file_operations proc_pid_maps_operations;
 271 extern const struct file_operations proc_tid_maps_operations;
 272 extern const struct file_operations proc_pid_numa_maps_operations;
 273 extern const struct file_operations proc_tid_numa_maps_operations;
 274 extern const struct file_operations proc_pid_smaps_operations;
 275 extern const struct file_operations proc_pid_smaps_rollup_operations;
 276 extern const struct file_operations proc_tid_smaps_operations;
 277 extern const struct file_operations proc_clear_refs_operations;
 278 extern const struct file_operations proc_pagemap_operations;
 279
 280 extern unsigned long task_vsize(struct mm_struct *);
 281 extern unsigned long task_statm(struct mm_struct *,
 282                                 unsigned long *, unsigned long *,
 283                                 unsigned long *, unsigned long *);
 284 extern void task_mem(struct seq_file *, struct mm_struct *);