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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; | |
f76baf93 | 108 | struct super_block *sb; |
1da177e4 LT |
109 | unsigned long exp_timeout; |
110 | ino_t next_dir_ino; | |
111 | struct autofs_wait_queue *queues; /* Wait queue pointer */ | |
112 | struct autofs_dirhash dirhash; /* Root directory hash */ | |
113 | struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS]; | |
114 | unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN]; | |
115 | }; | |
116 | ||
117 | static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb) | |
118 | { | |
119 | return (struct autofs_sb_info *)(sb->s_fs_info); | |
120 | } | |
121 | ||
122 | /* autofs_oz_mode(): do we see the man behind the curtain? (The | |
123 | processes which do manipulations for us in user space sees the raw | |
124 | filesystem without "magic".) */ | |
125 | ||
126 | static inline int autofs_oz_mode(struct autofs_sb_info *sbi) { | |
127 | return sbi->catatonic || process_group(current) == sbi->oz_pgrp; | |
128 | } | |
129 | ||
130 | /* Hash operations */ | |
131 | ||
132 | void autofs_initialize_hash(struct autofs_dirhash *); | |
133 | struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *); | |
134 | void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *); | |
135 | void autofs_hash_delete(struct autofs_dir_ent *); | |
136 | struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *); | |
137 | void autofs_hash_dputall(struct autofs_dirhash *); | |
f76baf93 | 138 | void autofs_hash_nuke(struct autofs_sb_info *); |
1da177e4 LT |
139 | |
140 | /* Expiration-handling functions */ | |
141 | ||
142 | void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *); | |
143 | struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt); | |
144 | ||
145 | /* Operations structures */ | |
146 | ||
147 | extern struct inode_operations autofs_root_inode_operations; | |
148 | extern struct inode_operations autofs_symlink_inode_operations; | |
149 | extern struct file_operations autofs_root_operations; | |
150 | ||
151 | /* Initializing function */ | |
152 | ||
153 | int autofs_fill_super(struct super_block *, void *, int); | |
154 | ||
155 | /* Queue management functions */ | |
156 | ||
157 | int autofs_wait(struct autofs_sb_info *,struct qstr *); | |
158 | int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); | |
159 | void autofs_catatonic_mode(struct autofs_sb_info *); | |
160 | ||
161 | #ifdef DEBUG | |
162 | void autofs_say(const char *name, int len); | |
163 | #else | |
164 | #define autofs_say(n,l) ((void)0) | |
165 | #endif |