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