1 /* internal.h: 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/sched.h> 13 #include <linux/proc_fs.h> 14 #include <linux/binfmts.h> 15 struct ctl_table_header; 16 struct mempolicy; 17 18 extern struct proc_dir_entry proc_root; 19 extern void proc_self_init(void); 20 #ifdef CONFIG_PROC_SYSCTL 21 extern int proc_sys_init(void); 22 extern void sysctl_head_put(struct ctl_table_header *head); 23 #else 24 static inline void proc_sys_init(void) { } 25 static inline void sysctl_head_put(struct ctl_table_header *head) { } 26 #endif 27 #ifdef CONFIG_NET 28 extern int proc_net_init(void); 29 #else 30 static inline int proc_net_init(void) { return 0; } 31 #endif 32 33 struct vmalloc_info { 34 unsigned long used; 35 unsigned long largest_chunk; 36 }; 37 38 #ifdef CONFIG_MMU 39 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 40 extern void get_vmalloc_info(struct vmalloc_info *vmi); 41 #else 42 43 #define VMALLOC_TOTAL 0UL 44 #define get_vmalloc_info(vmi) \ 45 do { \ 46 (vmi)->used = 0; \ 47 (vmi)->largest_chunk = 0; \ 48 } while(0) 49 #endif 50 51 extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 52 struct pid *pid, struct task_struct *task); 53 extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 54 struct pid *pid, struct task_struct *task); 55 extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 56 struct pid *pid, struct task_struct *task); 57 extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 58 struct pid *pid, struct task_struct *task); 59 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig); 60 61 extern const struct file_operations proc_tid_children_operations; 62 extern const struct file_operations proc_pid_maps_operations; 63 extern const struct file_operations proc_tid_maps_operations; 64 extern const struct file_operations proc_pid_numa_maps_operations; 65 extern const struct file_operations proc_tid_numa_maps_operations; 66 extern const struct file_operations proc_pid_smaps_operations; 67 extern const struct file_operations proc_tid_smaps_operations; 68 extern const struct file_operations proc_clear_refs_operations; 69 extern const struct file_operations proc_pagemap_operations; 70 extern const struct file_operations proc_net_operations; 71 extern const struct inode_operations proc_net_inode_operations; 72 extern const struct inode_operations proc_pid_link_inode_operations; 73 74 struct proc_maps_private { 75 struct pid *pid; 76 struct task_struct *task; 77 #ifdef CONFIG_MMU 78 struct vm_area_struct *tail_vma; 79 #endif 80 #ifdef CONFIG_NUMA 81 struct mempolicy *task_mempolicy; 82 #endif 83 }; 84 85 void proc_init_inodecache(void); 86 87 static inline struct pid *proc_pid(struct inode *inode) 88 { 89 return PROC_I(inode)->pid; 90 } 91 92 static inline struct task_struct *get_proc_task(struct inode *inode) 93 { 94 return get_pid_task(proc_pid(inode), PIDTYPE_PID); 95 } 96 97 static inline int proc_fd(struct inode *inode) 98 { 99 return PROC_I(inode)->fd; 100 } 101 102 static inline int task_dumpable(struct task_struct *task) 103 { 104 int dumpable = 0; 105 struct mm_struct *mm; 106 107 task_lock(task); 108 mm = task->mm; 109 if (mm) 110 dumpable = get_dumpable(mm); 111 task_unlock(task); 112 if (dumpable == SUID_DUMP_USER) 113 return 1; 114 return 0; 115 } 116 117 static inline int pid_delete_dentry(const struct dentry * dentry) 118 { 119 /* Is the task we represent dead? 120 * If so, then don't put the dentry on the lru list, 121 * kill it immediately. 122 */ 123 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; 124 } 125 126 static inline unsigned name_to_int(struct dentry *dentry) 127 { 128 const char *name = dentry->d_name.name; 129 int len = dentry->d_name.len; 130 unsigned n = 0; 131 132 if (len > 1 && *name == '0') 133 goto out; 134 while (len-- > 0) { 135 unsigned c = *name++ - '0'; 136 if (c > 9) 137 goto out; 138 if (n >= (~0U-9)/10) 139 goto out; 140 n *= 10; 141 n += c; 142 } 143 return n; 144 out: 145 return ~0U; 146 } 147 148 struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino, 149 struct dentry *dentry); 150 int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent, 151 filldir_t filldir); 152 153 struct pde_opener { 154 struct file *file; 155 struct list_head lh; 156 int closing; 157 struct completion *c; 158 }; 159 160 ssize_t __proc_file_read(struct file *, char __user *, size_t, loff_t *); 161 extern const struct file_operations proc_file_operations; 162 void proc_entry_rundown(struct proc_dir_entry *); 163 164 extern spinlock_t proc_subdir_lock; 165 166 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int); 167 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir); 168 unsigned long task_vsize(struct mm_struct *); 169 unsigned long task_statm(struct mm_struct *, 170 unsigned long *, unsigned long *, unsigned long *, unsigned long *); 171 void task_mem(struct seq_file *, struct mm_struct *); 172 173 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) 174 { 175 atomic_inc(&pde->count); 176 return pde; 177 } 178 void pde_put(struct proc_dir_entry *pde); 179 180 int proc_fill_super(struct super_block *); 181 struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); 182 int proc_remount(struct super_block *sb, int *flags, char *data); 183 184 /* 185 * These are generic /proc routines that use the internal 186 * "struct proc_dir_entry" tree to traverse the filesystem. 187 * 188 * The /proc root directory has extended versions to take care 189 * of the /proc/<pid> subdirectories. 190 */ 191 int proc_readdir(struct file *, void *, filldir_t); 192 struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); 193 194 195 196 /* Lookups */ 197 typedef struct dentry *instantiate_t(struct inode *, struct dentry *, 198 struct task_struct *, const void *); 199 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, 200 const char *name, int len, 201 instantiate_t instantiate, struct task_struct *task, const void *ptr); 202 int pid_revalidate(struct dentry *dentry, unsigned int flags); 203 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task); 204 extern const struct dentry_operations pid_dentry_operations; 205 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); 206 int proc_setattr(struct dentry *dentry, struct iattr *attr); 207 208 extern const struct inode_operations proc_ns_dir_inode_operations; 209 extern const struct file_operations proc_ns_dir_operations; 210 211 extern int proc_setup_self(struct super_block *); 212