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 18 struct ctl_table_header; 19 struct mempolicy; 20 21 /* 22 * This is not completely implemented yet. The idea is to 23 * create an in-memory tree (like the actual /proc filesystem 24 * tree) of these proc_dir_entries, so that we can dynamically 25 * add new files to /proc. 26 * 27 * parent/subdir are used for the directory structure (every /proc file has a 28 * parent, but "subdir" is empty for all non-directory entries). 29 * subdir_node is used to build the rb tree "subdir" of the parent. 30 */ 31 struct proc_dir_entry { 32 unsigned int low_ino; 33 umode_t mode; 34 nlink_t nlink; 35 kuid_t uid; 36 kgid_t gid; 37 loff_t size; 38 const struct inode_operations *proc_iops; 39 const struct file_operations *proc_fops; 40 struct proc_dir_entry *parent; 41 struct rb_root subdir; 42 struct rb_node subdir_node; 43 void *data; 44 atomic_t count; /* use count */ 45 atomic_t in_use; /* number of callers into module in progress; */ 46 /* negative -> it's going away RSN */ 47 struct completion *pde_unload_completion; 48 struct list_head pde_openers; /* who did ->open, but not ->release */ 49 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */ 50 u8 namelen; 51 char name[]; 52 }; 53 54 union proc_op { 55 int (*proc_get_link)(struct dentry *, struct path *); 56 int (*proc_show)(struct seq_file *m, 57 struct pid_namespace *ns, struct pid *pid, 58 struct task_struct *task); 59 }; 60 61 struct proc_inode { 62 struct pid *pid; 63 unsigned int fd; 64 union proc_op op; 65 struct proc_dir_entry *pde; 66 struct ctl_table_header *sysctl; 67 struct ctl_table *sysctl_entry; 68 struct list_head sysctl_inodes; 69 const struct proc_ns_operations *ns_ops; 70 struct inode vfs_inode; 71 }; 72 73 /* 74 * General functions 75 */ 76 static inline struct proc_inode *PROC_I(const struct inode *inode) 77 { 78 return container_of(inode, struct proc_inode, vfs_inode); 79 } 80 81 static inline struct proc_dir_entry *PDE(const struct inode *inode) 82 { 83 return PROC_I(inode)->pde; 84 } 85 86 static inline void *__PDE_DATA(const struct inode *inode) 87 { 88 return PDE(inode)->data; 89 } 90 91 static inline struct pid *proc_pid(struct inode *inode) 92 { 93 return PROC_I(inode)->pid; 94 } 95 96 static inline struct task_struct *get_proc_task(struct inode *inode) 97 { 98 return get_pid_task(proc_pid(inode), PIDTYPE_PID); 99 } 100 101 void task_dump_owner(struct task_struct *task, mode_t mode, 102 kuid_t *ruid, kgid_t *rgid); 103 104 static inline unsigned name_to_int(const struct qstr *qstr) 105 { 106 const char *name = qstr->name; 107 int len = qstr->len; 108 unsigned n = 0; 109 110 if (len > 1 && *name == '0') 111 goto out; 112 while (len-- > 0) { 113 unsigned c = *name++ - '0'; 114 if (c > 9) 115 goto out; 116 if (n >= (~0U-9)/10) 117 goto out; 118 n *= 10; 119 n += c; 120 } 121 return n; 122 out: 123 return ~0U; 124 } 125 126 /* 127 * Offset of the first process in the /proc root directory.. 128 */ 129 #define FIRST_PROCESS_ENTRY 256 130 131 /* Worst case buffer size needed for holding an integer. */ 132 #define PROC_NUMBUF 13 133 134 /* 135 * array.c 136 */ 137 extern const struct file_operations proc_tid_children_operations; 138 139 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, 140 struct pid *, struct task_struct *); 141 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, 142 struct pid *, struct task_struct *); 143 extern int proc_pid_status(struct seq_file *, struct pid_namespace *, 144 struct pid *, struct task_struct *); 145 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, 146 struct pid *, struct task_struct *); 147 148 /* 149 * base.c 150 */ 151 extern const struct dentry_operations pid_dentry_operations; 152 extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *); 153 extern int proc_setattr(struct dentry *, struct iattr *); 154 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t); 155 extern int pid_revalidate(struct dentry *, unsigned int); 156 extern int pid_delete_dentry(const struct dentry *); 157 extern int proc_pid_readdir(struct file *, struct dir_context *); 158 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); 159 extern loff_t mem_lseek(struct file *, loff_t, int); 160 161 /* Lookups */ 162 typedef int instantiate_t(struct inode *, struct dentry *, 163 struct task_struct *, const void *); 164 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, 165 instantiate_t, struct task_struct *, const void *); 166 167 /* 168 * generic.c 169 */ 170 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); 171 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *, 172 struct dentry *); 173 extern int proc_readdir(struct file *, struct dir_context *); 174 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *); 175 176 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) 177 { 178 atomic_inc(&pde->count); 179 return pde; 180 } 181 extern void pde_put(struct proc_dir_entry *); 182 183 static inline bool is_empty_pde(const struct proc_dir_entry *pde) 184 { 185 return S_ISDIR(pde->mode) && !pde->proc_iops; 186 } 187 188 /* 189 * inode.c 190 */ 191 struct pde_opener { 192 struct file *file; 193 struct list_head lh; 194 bool closing; 195 struct completion *c; 196 }; 197 extern const struct inode_operations proc_link_inode_operations; 198 199 extern const struct inode_operations proc_pid_link_inode_operations; 200 201 extern void proc_init_inodecache(void); 202 void set_proc_pid_nlink(void); 203 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); 204 extern int proc_fill_super(struct super_block *, void *data, int flags); 205 extern void proc_entry_rundown(struct proc_dir_entry *); 206 207 /* 208 * proc_namespaces.c 209 */ 210 extern const struct inode_operations proc_ns_dir_inode_operations; 211 extern const struct file_operations proc_ns_dir_operations; 212 213 /* 214 * proc_net.c 215 */ 216 extern const struct file_operations proc_net_operations; 217 extern const struct inode_operations proc_net_inode_operations; 218 219 #ifdef CONFIG_NET 220 extern int proc_net_init(void); 221 #else 222 static inline int proc_net_init(void) { return 0; } 223 #endif 224 225 /* 226 * proc_self.c 227 */ 228 extern int proc_setup_self(struct super_block *); 229 230 /* 231 * proc_thread_self.c 232 */ 233 extern int proc_setup_thread_self(struct super_block *); 234 extern void proc_thread_self_init(void); 235 236 /* 237 * proc_sysctl.c 238 */ 239 #ifdef CONFIG_PROC_SYSCTL 240 extern int proc_sys_init(void); 241 extern void proc_sys_evict_inode(struct inode *inode, 242 struct ctl_table_header *head); 243 #else 244 static inline void proc_sys_init(void) { } 245 static inline void proc_sys_evict_inode(struct inode *inode, 246 struct ctl_table_header *head) { } 247 #endif 248 249 /* 250 * proc_tty.c 251 */ 252 #ifdef CONFIG_TTY 253 extern void proc_tty_init(void); 254 #else 255 static inline void proc_tty_init(void) {} 256 #endif 257 258 /* 259 * root.c 260 */ 261 extern struct proc_dir_entry proc_root; 262 extern int proc_parse_options(char *options, struct pid_namespace *pid); 263 264 extern void proc_self_init(void); 265 extern int proc_remount(struct super_block *, int *, char *); 266 267 /* 268 * task_[no]mmu.c 269 */ 270 struct proc_maps_private { 271 struct inode *inode; 272 struct task_struct *task; 273 struct mm_struct *mm; 274 #ifdef CONFIG_MMU 275 struct vm_area_struct *tail_vma; 276 #endif 277 #ifdef CONFIG_NUMA 278 struct mempolicy *task_mempolicy; 279 #endif 280 }; 281 282 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode); 283 284 extern const struct file_operations proc_pid_maps_operations; 285 extern const struct file_operations proc_tid_maps_operations; 286 extern const struct file_operations proc_pid_numa_maps_operations; 287 extern const struct file_operations proc_tid_numa_maps_operations; 288 extern const struct file_operations proc_pid_smaps_operations; 289 extern const struct file_operations proc_tid_smaps_operations; 290 extern const struct file_operations proc_clear_refs_operations; 291 extern const struct file_operations proc_pagemap_operations; 292 293 extern unsigned long task_vsize(struct mm_struct *); 294 extern unsigned long task_statm(struct mm_struct *, 295 unsigned long *, unsigned long *, 296 unsigned long *, unsigned long *); 297 extern void task_mem(struct seq_file *, struct mm_struct *); 298