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