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