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 * The "next" pointer creates a linked list of one /proc directory, 28 * while parent/subdir create the directory structure (every 29 * /proc file has a parent, but "subdir" is NULL for all 30 * non-directory entries). 31 */ 32 struct proc_dir_entry { 33 unsigned int low_ino; 34 umode_t mode; 35 nlink_t nlink; 36 kuid_t uid; 37 kgid_t gid; 38 loff_t size; 39 const struct inode_operations *proc_iops; 40 const struct file_operations *proc_fops; 41 struct proc_dir_entry *next, *parent, *subdir; 42 void *data; 43 atomic_t count; /* use count */ 44 atomic_t in_use; /* number of callers into module in progress; */ 45 /* negative -> it's going away RSN */ 46 struct completion *pde_unload_completion; 47 struct list_head pde_openers; /* who did ->open, but not ->release */ 48 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */ 49 u8 namelen; 50 char name[]; 51 }; 52 53 union proc_op { 54 int (*proc_get_link)(struct dentry *, struct path *); 55 int (*proc_show)(struct seq_file *m, 56 struct pid_namespace *ns, struct pid *pid, 57 struct task_struct *task); 58 }; 59 60 struct proc_inode { 61 struct pid *pid; 62 int fd; 63 union proc_op op; 64 struct proc_dir_entry *pde; 65 struct ctl_table_header *sysctl; 66 struct ctl_table *sysctl_entry; 67 struct proc_ns ns; 68 struct inode vfs_inode; 69 }; 70 71 /* 72 * General functions 73 */ 74 static inline struct proc_inode *PROC_I(const struct inode *inode) 75 { 76 return container_of(inode, struct proc_inode, vfs_inode); 77 } 78 79 static inline struct proc_dir_entry *PDE(const struct inode *inode) 80 { 81 return PROC_I(inode)->pde; 82 } 83 84 static inline void *__PDE_DATA(const struct inode *inode) 85 { 86 return PDE(inode)->data; 87 } 88 89 static inline struct pid *proc_pid(struct inode *inode) 90 { 91 return PROC_I(inode)->pid; 92 } 93 94 static inline struct task_struct *get_proc_task(struct inode *inode) 95 { 96 return get_pid_task(proc_pid(inode), PIDTYPE_PID); 97 } 98 99 static inline int task_dumpable(struct task_struct *task) 100 { 101 int dumpable = 0; 102 struct mm_struct *mm; 103 104 task_lock(task); 105 mm = task->mm; 106 if (mm) 107 dumpable = get_dumpable(mm); 108 task_unlock(task); 109 if (dumpable == SUID_DUMP_USER) 110 return 1; 111 return 0; 112 } 113 114 static inline unsigned name_to_int(const struct qstr *qstr) 115 { 116 const char *name = qstr->name; 117 int len = qstr->len; 118 unsigned n = 0; 119 120 if (len > 1 && *name == '0') 121 goto out; 122 while (len-- > 0) { 123 unsigned c = *name++ - '0'; 124 if (c > 9) 125 goto out; 126 if (n >= (~0U-9)/10) 127 goto out; 128 n *= 10; 129 n += c; 130 } 131 return n; 132 out: 133 return ~0U; 134 } 135 136 /* 137 * Offset of the first process in the /proc root directory.. 138 */ 139 #define FIRST_PROCESS_ENTRY 256 140 141 /* Worst case buffer size needed for holding an integer. */ 142 #define PROC_NUMBUF 13 143 144 /* 145 * array.c 146 */ 147 extern const struct file_operations proc_tid_children_operations; 148 149 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, 150 struct pid *, struct task_struct *); 151 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, 152 struct pid *, struct task_struct *); 153 extern int proc_pid_status(struct seq_file *, struct pid_namespace *, 154 struct pid *, struct task_struct *); 155 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, 156 struct pid *, struct task_struct *); 157 158 /* 159 * base.c 160 */ 161 extern const struct dentry_operations pid_dentry_operations; 162 extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *); 163 extern int proc_setattr(struct dentry *, struct iattr *); 164 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *); 165 extern int pid_revalidate(struct dentry *, unsigned int); 166 extern int pid_delete_dentry(const struct dentry *); 167 extern int proc_pid_readdir(struct file *, struct dir_context *); 168 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); 169 extern loff_t mem_lseek(struct file *, loff_t, int); 170 171 /* Lookups */ 172 typedef int instantiate_t(struct inode *, struct dentry *, 173 struct task_struct *, const void *); 174 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, 175 instantiate_t, struct task_struct *, const void *); 176 177 /* 178 * generic.c 179 */ 180 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); 181 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *, 182 struct dentry *); 183 extern int proc_readdir(struct file *, struct dir_context *); 184 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *); 185 186 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) 187 { 188 atomic_inc(&pde->count); 189 return pde; 190 } 191 extern void pde_put(struct proc_dir_entry *); 192 193 /* 194 * inode.c 195 */ 196 struct pde_opener { 197 struct file *file; 198 struct list_head lh; 199 int closing; 200 struct completion *c; 201 }; 202 203 extern const struct inode_operations proc_pid_link_inode_operations; 204 205 extern void proc_init_inodecache(void); 206 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); 207 extern int proc_fill_super(struct super_block *); 208 extern void proc_entry_rundown(struct proc_dir_entry *); 209 210 /* 211 * proc_namespaces.c 212 */ 213 extern const struct inode_operations proc_ns_dir_inode_operations; 214 extern const struct file_operations proc_ns_dir_operations; 215 216 /* 217 * proc_net.c 218 */ 219 extern const struct file_operations proc_net_operations; 220 extern const struct inode_operations proc_net_inode_operations; 221 222 #ifdef CONFIG_NET 223 extern int proc_net_init(void); 224 #else 225 static inline int proc_net_init(void) { return 0; } 226 #endif 227 228 /* 229 * proc_self.c 230 */ 231 extern int proc_setup_self(struct super_block *); 232 233 /* 234 * proc_thread_self.c 235 */ 236 extern int proc_setup_thread_self(struct super_block *); 237 extern void proc_thread_self_init(void); 238 239 /* 240 * proc_sysctl.c 241 */ 242 #ifdef CONFIG_PROC_SYSCTL 243 extern int proc_sys_init(void); 244 extern void sysctl_head_put(struct ctl_table_header *); 245 #else 246 static inline void proc_sys_init(void) { } 247 static inline void sysctl_head_put(struct ctl_table_header *head) { } 248 #endif 249 250 /* 251 * proc_tty.c 252 */ 253 #ifdef CONFIG_TTY 254 extern void proc_tty_init(void); 255 #else 256 static inline void proc_tty_init(void) {} 257 #endif 258 259 /* 260 * root.c 261 */ 262 extern struct proc_dir_entry proc_root; 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 pid *pid; 272 struct task_struct *task; 273 #ifdef CONFIG_MMU 274 struct vm_area_struct *tail_vma; 275 #endif 276 #ifdef CONFIG_NUMA 277 struct mempolicy *task_mempolicy; 278 #endif 279 }; 280 281 extern const struct file_operations proc_pid_maps_operations; 282 extern const struct file_operations proc_tid_maps_operations; 283 extern const struct file_operations proc_pid_numa_maps_operations; 284 extern const struct file_operations proc_tid_numa_maps_operations; 285 extern const struct file_operations proc_pid_smaps_operations; 286 extern const struct file_operations proc_tid_smaps_operations; 287 extern const struct file_operations proc_clear_refs_operations; 288 extern const struct file_operations proc_pagemap_operations; 289 290 extern unsigned long task_vsize(struct mm_struct *); 291 extern unsigned long task_statm(struct mm_struct *, 292 unsigned long *, unsigned long *, 293 unsigned long *, unsigned long *); 294 extern void task_mem(struct seq_file *, struct mm_struct *); 295