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 #define AUTOFS_SUPER_MAGIC 0x0187
41
42 /*
43 * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
44 * kernel will keep the negative response cached for up to the time given
45 * here, although the time can be shorter if the kernel throws the dcache
46 * entry away. This probably should be settable from user space.
47 */
48 #define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */
49
50 /* Structures associated with the root directory hash table */
51
52 #define AUTOFS_HASH_SIZE 67
53
54 struct autofs_dir_ent {
55 int hash;
56 char *name;
57 int len;
58 ino_t ino;
59 struct dentry *dentry;
60 /* Linked list of entries */
61 struct autofs_dir_ent *next;
62 struct autofs_dir_ent **back;
63 /* The following entries are for the expiry system */
64 unsigned long last_usage;
65 struct list_head exp;
66 };
67
68 struct autofs_dirhash {
69 struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];
70 struct list_head expiry_head;
71 };
72
73 struct autofs_wait_queue {
74 wait_queue_head_t queue;
75 struct autofs_wait_queue *next;
76 autofs_wqt_t wait_queue_token;
77 /* We use the following to see what we are waiting for */
78 int hash;
79 int len;
80 char *name;
81 /* This is for status reporting upon return */
82 int status;
83 int wait_ctr;
84 };
85
86 struct autofs_symlink {
87 char *data;
88 int len;
89 time_t mtime;
90 };
91
92 #define AUTOFS_MAX_SYMLINKS 256
93
94 #define AUTOFS_ROOT_INO 1
95 #define AUTOFS_FIRST_SYMLINK 2
96 #define AUTOFS_FIRST_DIR_INO (AUTOFS_FIRST_SYMLINK+AUTOFS_MAX_SYMLINKS)
97
98 #define AUTOFS_SYMLINK_BITMAP_LEN \
99 ((AUTOFS_MAX_SYMLINKS+((sizeof(long)*1)-1))/(sizeof(long)*8))
100
101 #define AUTOFS_SBI_MAGIC 0x6d4a556d
102
103 struct autofs_sb_info {
104 u32 magic;
105 struct file *pipe;
106 pid_t oz_pgrp;
107 int catatonic;
108 unsigned long exp_timeout;
109 ino_t next_dir_ino;
110 struct autofs_wait_queue *queues; /* Wait queue pointer */
111 struct autofs_dirhash dirhash; /* Root directory hash */
112 struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS];
113 unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];
114 };
115
116 static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
117 {
118 return (struct autofs_sb_info *)(sb->s_fs_info);
119 }
120
121 /* autofs_oz_mode(): do we see the man behind the curtain? (The
122 processes which do manipulations for us in user space sees the raw
123 filesystem without "magic".) */
124
125 static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {
126 return sbi->catatonic || process_group(current) == sbi->oz_pgrp;
127 }
128
129 /* Hash operations */
130
131 void autofs_initialize_hash(struct autofs_dirhash *);
132 struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *);
133 void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *);
134 void autofs_hash_delete(struct autofs_dir_ent *);
135 struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *);
136 void autofs_hash_dputall(struct autofs_dirhash *);
137 void autofs_hash_nuke(struct autofs_dirhash *);
138
139 /* Expiration-handling functions */
140
141 void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *);
142 struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt);
143
144 /* Operations structures */
145
146 extern struct inode_operations autofs_root_inode_operations;
147 extern struct inode_operations autofs_symlink_inode_operations;
148 extern struct file_operations autofs_root_operations;
149
150 /* Initializing function */
151
152 int autofs_fill_super(struct super_block *, void *, int);
153
154 /* Queue management functions */
155
156 int autofs_wait(struct autofs_sb_info *,struct qstr *);
157 int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
158 void autofs_catatonic_mode(struct autofs_sb_info *);
159
160 #ifdef DEBUG
161 void autofs_say(const char *name, int len);
162 #else
163 #define autofs_say(n,l) ((void)0)
164 #endif
165
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