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_read)(struct task_struct *task, char *page); 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 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 proc_ns ns; 69 struct inode vfs_inode; 70 }; 71 72 /* 73 * General functions 74 */ 75 static inline struct proc_inode *PROC_I(const struct inode *inode) 76 { 77 return container_of(inode, struct proc_inode, vfs_inode); 78 } 79 80 static inline struct proc_dir_entry *PDE(const struct inode *inode) 81 { 82 return PROC_I(inode)->pde; 83 } 84 85 static inline void *__PDE_DATA(const struct inode *inode) 86 { 87 return PDE(inode)->data; 88 } 89 90 static inline struct pid *proc_pid(struct inode *inode) 91 { 92 return PROC_I(inode)->pid; 93 } 94 95 static inline struct task_struct *get_proc_task(struct inode *inode) 96 { 97 return get_pid_task(proc_pid(inode), PIDTYPE_PID); 98 } 99 100 static inline int task_dumpable(struct task_struct *task) 101 { 102 int dumpable = 0; 103 struct mm_struct *mm; 104 105 task_lock(task); 106 mm = task->mm; 107 if (mm) 108 dumpable = get_dumpable(mm); 109 task_unlock(task); 110 if (dumpable == SUID_DUMP_USER) 111 return 1; 112 return 0; 113 } 114 115 static inline unsigned name_to_int(struct dentry *dentry) 116 { 117 const char *name = dentry->d_name.name; 118 int len = dentry->d_name.len; 119 unsigned n = 0; 120 121 if (len > 1 && *name == '0') 122 goto out; 123 while (len-- > 0) { 124 unsigned c = *name++ - '0'; 125 if (c > 9) 126 goto out; 127 if (n >= (~0U-9)/10) 128 goto out; 129 n *= 10; 130 n += c; 131 } 132 return n; 133 out: 134 return ~0U; 135 } 136 137 /* 138 * Offset of the first process in the /proc root directory.. 139 */ 140 #define FIRST_PROCESS_ENTRY 256 141 142 /* Worst case buffer size needed for holding an integer. */ 143 #define PROC_NUMBUF 13 144 145 /* 146 * array.c 147 */ 148 extern const struct file_operations proc_tid_children_operations; 149 150 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, 151 struct pid *, struct task_struct *); 152 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, 153 struct pid *, struct task_struct *); 154 extern int proc_pid_status(struct seq_file *, struct pid_namespace *, 155 struct pid *, struct task_struct *); 156 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, 157 struct pid *, struct task_struct *); 158 159 /* 160 * base.c 161 */ 162 extern const struct dentry_operations pid_dentry_operations; 163 extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *); 164 extern int proc_setattr(struct dentry *, struct iattr *); 165 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *); 166 extern int pid_revalidate(struct dentry *, unsigned int); 167 extern int pid_delete_dentry(const struct dentry *); 168 extern int proc_pid_readdir(struct file *, struct dir_context *); 169 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); 170 extern loff_t mem_lseek(struct file *, loff_t, int); 171 172 /* Lookups */ 173 typedef int instantiate_t(struct inode *, struct dentry *, 174 struct task_struct *, const void *); 175 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, 176 instantiate_t, struct task_struct *, const void *); 177 178 /* 179 * generic.c 180 */ 181 extern spinlock_t proc_subdir_lock; 182 183 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); 184 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *, 185 struct dentry *); 186 extern int proc_readdir(struct file *, struct dir_context *); 187 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *); 188 189 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) 190 { 191 atomic_inc(&pde->count); 192 return pde; 193 } 194 extern void pde_put(struct proc_dir_entry *); 195 196 /* 197 * inode.c 198 */ 199 struct pde_opener { 200 struct file *file; 201 struct list_head lh; 202 int closing; 203 struct completion *c; 204 }; 205 206 extern const struct inode_operations proc_pid_link_inode_operations; 207 208 extern void proc_init_inodecache(void); 209 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); 210 extern int proc_fill_super(struct super_block *); 211 extern void proc_entry_rundown(struct proc_dir_entry *); 212 213 /* 214 * proc_namespaces.c 215 */ 216 extern const struct inode_operations proc_ns_dir_inode_operations; 217 extern const struct file_operations proc_ns_dir_operations; 218 219 /* 220 * proc_net.c 221 */ 222 extern const struct file_operations proc_net_operations; 223 extern const struct inode_operations proc_net_inode_operations; 224 225 #ifdef CONFIG_NET 226 extern int proc_net_init(void); 227 #else 228 static inline int proc_net_init(void) { return 0; } 229 #endif 230 231 /* 232 * proc_self.c 233 */ 234 extern int proc_setup_self(struct super_block *); 235 236 /* 237 * proc_sysctl.c 238 */ 239 #ifdef CONFIG_PROC_SYSCTL 240 extern int proc_sys_init(void); 241 extern void sysctl_head_put(struct ctl_table_header *); 242 #else 243 static inline void proc_sys_init(void) { } 244 static inline void sysctl_head_put(struct ctl_table_header *head) { } 245 #endif 246 247 /* 248 * proc_tty.c 249 */ 250 #ifdef CONFIG_TTY 251 extern void proc_tty_init(void); 252 #else 253 static inline void proc_tty_init(void) {} 254 #endif 255 256 /* 257 * root.c 258 */ 259 extern struct proc_dir_entry proc_root; 260 261 extern void proc_self_init(void); 262 extern int proc_remount(struct super_block *, int *, char *); 263 264 /* 265 * task_[no]mmu.c 266 */ 267 struct proc_maps_private { 268 struct pid *pid; 269 struct task_struct *task; 270 #ifdef CONFIG_MMU 271 struct vm_area_struct *tail_vma; 272 #endif 273 #ifdef CONFIG_NUMA 274 struct mempolicy *task_mempolicy; 275 #endif 276 }; 277 278 extern const struct file_operations proc_pid_maps_operations; 279 extern const struct file_operations proc_tid_maps_operations; 280 extern const struct file_operations proc_pid_numa_maps_operations; 281 extern const struct file_operations proc_tid_numa_maps_operations; 282 extern const struct file_operations proc_pid_smaps_operations; 283 extern const struct file_operations proc_tid_smaps_operations; 284 extern const struct file_operations proc_clear_refs_operations; 285 extern const struct file_operations proc_pagemap_operations; 286 287 extern unsigned long task_vsize(struct mm_struct *); 288 extern unsigned long task_statm(struct mm_struct *, 289 unsigned long *, unsigned long *, 290 unsigned long *, unsigned long *); 291 extern void task_mem(struct seq_file *, struct mm_struct *); 292