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/refcount.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/atomic.h>
  17 #include <linux/binfmts.h>
  18 #include <linux/sched/coredump.h>
  19 #include <linux/sched/task.h>
  20
  21 struct ctl_table_header;
  22 struct mempolicy;
  23
  24 /*
  25  * This is not completely implemented yet. The idea is to
  26  * create an in-memory tree (like the actual /proc filesystem
  27  * tree) of these proc_dir_entries, so that we can dynamically
  28  * add new files to /proc.
  29  *
  30  * parent/subdir are used for the directory structure (every /proc file has a
  31  * parent, but "subdir" is empty for all non-directory entries).
  32  * subdir_node is used to build the rb tree "subdir" of the parent.
  33  */
  34 struct proc_dir_entry {
  35         /*
  36          * number of callers into module in progress;
  37          * negative -> it's going away RSN
  38          */
  39         atomic_t in_use;
  40         refcount_t refcnt;
  41         struct list_head pde_openers;   /* who did ->open, but not ->release */
  42         /* protects ->pde_openers and all struct pde_opener instances */
  43         spinlock_t pde_unload_lock;
  44         struct completion *pde_unload_completion;
  45         const struct inode_operations *proc_iops;
  46         const struct file_operations *proc_fops;
  47         union {
  48                 const struct seq_operations *seq_ops;
  49                 int (*single_show)(struct seq_file *, void *);
  50         };
  51         proc_write_t write;
  52         void *data;
  53         unsigned int state_size;
  54         unsigned int low_ino;
  55         nlink_t nlink;
  56         kuid_t uid;
  57         kgid_t gid;
  58         loff_t size;
  59         struct proc_dir_entry *parent;
  60         struct rb_root subdir;
  61         struct rb_node subdir_node;
  62         char *name;
  63         umode_t mode;
  64         u8 namelen;
  65         char inline_name[];
  66 } __randomize_layout;
  67
  68 #define SIZEOF_PDE      (                               \
  69         sizeof(struct proc_dir_entry) < 128 ? 128 :     \
  70         sizeof(struct proc_dir_entry) < 192 ? 192 :     \
  71         sizeof(struct proc_dir_entry) < 256 ? 256 :     \
  72         sizeof(struct proc_dir_entry) < 512 ? 512 :     \
  73         0)
  74 #define SIZEOF_PDE_INLINE_NAME (SIZEOF_PDE - sizeof(struct proc_dir_entry))
  75
  76 extern struct kmem_cache *proc_dir_entry_cache;
  77 void pde_free(struct proc_dir_entry *pde);
  78
  79 union proc_op {
  80         int (*proc_get_link)(struct dentry *, struct path *);
  81         int (*proc_show)(struct seq_file *m,
  82                 struct pid_namespace *ns, struct pid *pid,
  83                 struct task_struct *task);
  84 };
  85
  86 struct proc_inode {
  87         struct pid *pid;
  88         unsigned int fd;
  89         union proc_op op;
  90         struct proc_dir_entry *pde;
  91         struct ctl_table_header *sysctl;
  92         struct ctl_table *sysctl_entry;
  93         struct hlist_node sysctl_inodes;
  94         const struct proc_ns_operations *ns_ops;
  95         struct inode vfs_inode;
  96 } __randomize_layout;
  97
  98 /*
  99  * General functions
 100  */
 101 static inline struct proc_inode *PROC_I(const struct inode *inode)
 102 {
 103         return container_of(inode, struct proc_inode, vfs_inode);
 104 }
 105
 106 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 107 {
 108         return PROC_I(inode)->pde;
 109 }
 110
 111 static inline void *__PDE_DATA(const struct inode *inode)
 112 {
 113         return PDE(inode)->data;
 114 }
 115
 116 static inline struct pid *proc_pid(const struct inode *inode)
 117 {
 118         return PROC_I(inode)->pid;
 119 }
 120
 121 static inline struct task_struct *get_proc_task(const struct inode *inode)
 122 {
 123         return get_pid_task(proc_pid(inode), PIDTYPE_PID);
 124 }
 125
 126 void task_dump_owner(struct task_struct *task, umode_t mode,
 127                      kuid_t *ruid, kgid_t *rgid);
 128
 129 unsigned name_to_int(const struct qstr *qstr);
 130 /*
 131  * Offset of the first process in the /proc root directory..
 132  */
 133 #define FIRST_PROCESS_ENTRY 256
 134
 135 /* Worst case buffer size needed for holding an integer. */
 136 #define PROC_NUMBUF 13
 137
 138 /*
 139  * array.c
 140  */
 141 extern const struct file_operations proc_tid_children_operations;
 142
 143 extern void proc_task_name(struct seq_file *m, struct task_struct *p,
 144                            bool escape);
 145 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
 146                          struct pid *, struct task_struct *);
 147 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
 148                           struct pid *, struct task_struct *);
 149 extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
 150                            struct pid *, struct task_struct *);
 151 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
 152                           struct pid *, struct task_struct *);
 153
 154 /*
 155  * base.c
 156  */
 157 extern const struct dentry_operations pid_dentry_operations;
 158 extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
 159 extern int proc_setattr(struct dentry *, struct iattr *);
 160 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
 161 extern void pid_update_inode(struct task_struct *, struct inode *);
 162 extern int pid_delete_dentry(const struct dentry *);
 163 extern int proc_pid_readdir(struct file *, struct dir_context *);
 164 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
 165 extern loff_t mem_lseek(struct file *, loff_t, int);
 166
 167 /* Lookups */
 168 typedef struct dentry *instantiate_t(struct dentry *,
 169                                      struct task_struct *, const void *);
 170 bool proc_fill_cache(struct file *, struct dir_context *, const char *, unsigned int,
 171                            instantiate_t, struct task_struct *, const void *);
 172
 173 /*
 174  * generic.c
 175  */
 176 struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
 177                 struct proc_dir_entry **parent, void *data);
 178 struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
 179                 struct proc_dir_entry *dp);
 180 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
 181 struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *);
 182 extern int proc_readdir(struct file *, struct dir_context *);
 183 int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *);
 184
 185 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
 186 {
 187         refcount_inc(&pde->refcnt);
 188         return pde;
 189 }
 190 extern void pde_put(struct proc_dir_entry *);
 191
 192 static inline bool is_empty_pde(const struct proc_dir_entry *pde)
 193 {
 194         return S_ISDIR(pde->mode) && !pde->proc_iops;
 195 }
 196 extern ssize_t proc_simple_write(struct file *, const char __user *, size_t, loff_t *);
 197
 198 /*
 199  * inode.c
 200  */
 201 struct pde_opener {
 202         struct file *file;
 203         struct list_head lh;
 204         bool closing;
 205         struct completion *c;
 206 } __randomize_layout;
 207 extern const struct inode_operations proc_link_inode_operations;
 208
 209 extern const struct inode_operations proc_pid_link_inode_operations;
 210
 211 void proc_init_kmemcache(void);
 212 void set_proc_pid_nlink(void);
 213 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
 214 extern int proc_fill_super(struct super_block *, void *data, int flags);
 215 extern void proc_entry_rundown(struct proc_dir_entry *);
 216
 217 /*
 218  * proc_namespaces.c
 219  */
 220 extern const struct inode_operations proc_ns_dir_inode_operations;
 221 extern const struct file_operations proc_ns_dir_operations;
 222
 223 /*
 224  * proc_net.c
 225  */
 226 extern const struct file_operations proc_net_operations;
 227 extern const struct inode_operations proc_net_inode_operations;
 228
 229 #ifdef CONFIG_NET
 230 extern int proc_net_init(void);
 231 #else
 232 static inline int proc_net_init(void) { return 0; }
 233 #endif
 234
 235 /*
 236  * proc_self.c
 237  */
 238 extern int proc_setup_self(struct super_block *);
 239
 240 /*
 241  * proc_thread_self.c
 242  */
 243 extern int proc_setup_thread_self(struct super_block *);
 244 extern void proc_thread_self_init(void);
 245
 246 /*
 247  * proc_sysctl.c
 248  */
 249 #ifdef CONFIG_PROC_SYSCTL
 250 extern int proc_sys_init(void);
 251 extern void proc_sys_evict_inode(struct inode *inode,
 252                                  struct ctl_table_header *head);
 253 #else
 254 static inline void proc_sys_init(void) { }
 255 static inline void proc_sys_evict_inode(struct  inode *inode,
 256                                         struct ctl_table_header *head) { }
 257 #endif
 258
 259 /*
 260  * proc_tty.c
 261  */
 262 #ifdef CONFIG_TTY
 263 extern void proc_tty_init(void);
 264 #else
 265 static inline void proc_tty_init(void) {}
 266 #endif
 267
 268 /*
 269  * root.c
 270  */
 271 extern struct proc_dir_entry proc_root;
 272 extern int proc_parse_options(char *options, struct pid_namespace *pid);
 273
 274 extern void proc_self_init(void);
 275 extern int proc_remount(struct super_block *, int *, char *);
 276
 277 /*
 278  * task_[no]mmu.c
 279  */
 280 struct mem_size_stats;
 281 struct proc_maps_private {
 282         struct inode *inode;
 283         struct task_struct *task;
 284         struct mm_struct *mm;
 285 #ifdef CONFIG_MMU
 286         struct vm_area_struct *tail_vma;
 287 #endif
 288 #ifdef CONFIG_NUMA
 289         struct mempolicy *task_mempolicy;
 290 #endif
 291 } __randomize_layout;
 292
 293 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
 294
 295 extern const struct file_operations proc_pid_maps_operations;
 296 extern const struct file_operations proc_pid_numa_maps_operations;
 297 extern const struct file_operations proc_pid_smaps_operations;
 298 extern const struct file_operations proc_pid_smaps_rollup_operations;
 299 extern const struct file_operations proc_clear_refs_operations;
 300 extern const struct file_operations proc_pagemap_operations;
 301
 302 extern unsigned long task_vsize(struct mm_struct *);
 303 extern unsigned long task_statm(struct mm_struct *,
 304                                 unsigned long *, unsigned long *,
 305                                 unsigned long *, unsigned long *);
 306 extern void task_mem(struct seq_file *, struct mm_struct *);