1/* -*- linux-c -*- ------------------------------------------------------- * 2 * 3 * linux/fs/autofs/autofs_i.h 4 * 5 * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved 6 * 7 * This file is part of the Linux kernel and is made available under 8 * the terms of the GNU General Public License, version 2, or at your 9 * option, any later version, incorporated herein by reference. 10 * 11 * ----------------------------------------------------------------------- */ 12 13/* Internal header file for autofs */ 14 15#include <linux/auto_fs.h> 16 17/* This is the range of ioctl() numbers we claim as ours */ 18#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY 19#define AUTOFS_IOC_COUNT 32 20 21#include <linux/kernel.h> 22#include <linux/slab.h> 23#include <linux/time.h> 24#include <linux/string.h> 25#include <linux/wait.h> 26#include <linux/dcache.h> 27#include <linux/namei.h> 28#include <linux/mount.h> 29#include <linux/sched.h> 30 31#include <asm/current.h> 32#include <asm/uaccess.h> 33 34#ifdef DEBUG 35#define DPRINTK(D) (printk D) 36#else 37#define DPRINTK(D) ((void)0) 38#endif 39 40/* 41 * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the 42 * kernel will keep the negative response cached for up to the time given 43 * here, although the time can be shorter if the kernel throws the dcache 44 * entry away. This probably should be settable from user space. 45 */ 46#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */ 47 48/* Structures associated with the root directory hash table */ 49 50#define AUTOFS_HASH_SIZE 67 51 52struct autofs_dir_ent { 53 int hash; 54 char *name; 55 int len; 56 ino_t ino; 57 struct dentry *dentry; 58 /* Linked list of entries */ 59 struct autofs_dir_ent *next; 60 struct autofs_dir_ent **back; 61 /* The following entries are for the expiry system */ 62 unsigned long last_usage; 63 struct list_head exp; 64}; 65 66struct autofs_dirhash { 67 struct autofs_dir_ent *h[AUTOFS_HASH_SIZE]; 68 struct list_head expiry_head; 69}; 70 71struct autofs_wait_queue { 72 wait_queue_head_t queue; 73 struct autofs_wait_queue *next; 74 autofs_wqt_t wait_queue_token; 75 /* We use the following to see what we are waiting for */ 76 int hash; 77 int len; 78 char *name; 79 /* This is for status reporting upon return */ 80 int status; 81 int wait_ctr; 82}; 83 84struct autofs_symlink { 85 char *data; 86 int len; 87 time_t mtime; 88}; 89 90#define AUTOFS_MAX_SYMLINKS 256 91 92#define AUTOFS_ROOT_INO 1 93#define AUTOFS_FIRST_SYMLINK 2 94#define AUTOFS_FIRST_DIR_INO (AUTOFS_FIRST_SYMLINK+AUTOFS_MAX_SYMLINKS) 95 96#define AUTOFS_SYMLINK_BITMAP_LEN \ 97 ((AUTOFS_MAX_SYMLINKS+((sizeof(long)*1)-1))/(sizeof(long)*8)) 98 99#define AUTOFS_SBI_MAGIC 0x6d4a556d 100 101struct autofs_sb_info { 102 u32 magic; 103 struct file *pipe; 104 struct pid *oz_pgrp; 105 int catatonic; 106 struct super_block *sb; 107 unsigned long exp_timeout; 108 ino_t next_dir_ino; 109 struct autofs_wait_queue *queues; /* Wait queue pointer */ 110 struct autofs_dirhash dirhash; /* Root directory hash */ 111 struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS]; 112 unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN]; 113}; 114 115static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb) 116{ 117 return (struct autofs_sb_info *)(sb->s_fs_info); 118} 119 120/* autofs_oz_mode(): do we see the man behind the curtain? (The 121 processes which do manipulations for us in user space sees the raw 122 filesystem without "magic".) */ 123 124static inline int autofs_oz_mode(struct autofs_sb_info *sbi) { 125 return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp; 126} 127 128/* Hash operations */ 129 130void autofs_initialize_hash(struct autofs_dirhash *); 131struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *); 132void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *); 133void autofs_hash_delete(struct autofs_dir_ent *); 134struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *); 135void autofs_hash_dputall(struct autofs_dirhash *); 136void autofs_hash_nuke(struct autofs_sb_info *); 137 138/* Expiration-handling functions */ 139 140void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *); 141struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt); 142 143/* Operations structures */ 144 145extern const struct inode_operations autofs_root_inode_operations; 146extern const struct inode_operations autofs_symlink_inode_operations; 147extern const struct file_operations autofs_root_operations; 148 149/* Initializing function */ 150 151int autofs_fill_super(struct super_block *, void *, int); 152void autofs_kill_sb(struct super_block *sb); 153 154/* Queue management functions */ 155 156int autofs_wait(struct autofs_sb_info *,struct qstr *); 157int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); 158void autofs_catatonic_mode(struct autofs_sb_info *); 159 160#ifdef DEBUG 161void autofs_say(const char *name, int len); 162#else 163#define autofs_say(n,l) ((void)0) 164#endif 165