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