1 /* -*- 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_fs4.h>
16 #include <linux/list.h>
17
18 /* This is the range of ioctl() numbers we claim as ours */
19 #define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
20 #define AUTOFS_IOC_COUNT 32
21
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/string.h>
26 #include <linux/wait.h>
27 #include <linux/sched.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <asm/current.h>
31 #include <asm/uaccess.h>
32
33 /* #define DEBUG */
34
35 #ifdef DEBUG
36 #define DPRINTK(fmt,args...) do { printk(KERN_DEBUG "pid %d: %s: " fmt "\n" , current->pid , __FUNCTION__ , ##args); } while(0)
37 #else
38 #define DPRINTK(fmt,args...) do {} while(0)
39 #endif
40
41 #define AUTOFS_SUPER_MAGIC 0x0187
42
43 /*
44 * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
45 * kernel will keep the negative response cached for up to the time given
46 * here, although the time can be shorter if the kernel throws the dcache
47 * entry away. This probably should be settable from user space.
48 */
49 #define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */
50
51 /* Unified info structure. This is pointed to by both the dentry and
52 inode structures. Each file in the filesystem has an instance of this
53 structure. It holds a reference to the dentry, so dentries are never
54 flushed while the file exists. All name lookups are dealt with at the
55 dentry level, although the filesystem can interfere in the validation
56 process. Readdir is implemented by traversing the dentry lists. */
57 struct autofs_info {
58 struct dentry *dentry;
59 struct inode *inode;
60
61 int flags;
62
63 struct autofs_sb_info *sbi;
64 unsigned long last_used;
65
66 mode_t mode;
67 size_t size;
68
69 void (*free)(struct autofs_info *);
70 union {
71 const char *symlink;
72 } u;
73 };
74
75 #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
76
77 struct autofs_wait_queue {
78 wait_queue_head_t queue;
79 struct autofs_wait_queue *next;
80 autofs_wqt_t wait_queue_token;
81 /* We use the following to see what we are waiting for */
82 int hash;
83 int len;
84 char *name;
85 /* This is for status reporting upon return */
86 int status;
87 atomic_t wait_ctr;
88 };
89
90 #define AUTOFS_SBI_MAGIC 0x6d4a556d
91
92 struct autofs_sb_info {
93 u32 magic;
94 struct file *pipe;
95 pid_t oz_pgrp;
96 int catatonic;
97 int version;
98 int sub_version;
99 unsigned long exp_timeout;
100 int reghost_enabled;
101 int needs_reghost;
102 struct super_block *sb;
103 struct semaphore wq_sem;
104 struct autofs_wait_queue *queues; /* Wait queue pointer */
105 };
106
107 static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
108 {
109 return (struct autofs_sb_info *)(sb->s_fs_info);
110 }
111
112 static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
113 {
114 return (struct autofs_info *)(dentry->d_fsdata);
115 }
116
117 /* autofs4_oz_mode(): do we see the man behind the curtain? (The
118 processes which do manipulations for us in user space sees the raw
119 filesystem without "magic".) */
120
121 static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
122 return sbi->catatonic || process_group(current) == sbi->oz_pgrp;
123 }
124
125 /* Does a dentry have some pending activity? */
126 static inline int autofs4_ispending(struct dentry *dentry)
127 {
128 struct autofs_info *inf = autofs4_dentry_ino(dentry);
129
130 return (dentry->d_flags & DCACHE_AUTOFS_PENDING) ||
131 (inf != NULL && inf->flags & AUTOFS_INF_EXPIRING);
132 }
133
134 static inline void autofs4_copy_atime(struct file *src, struct file *dst)
135 {
136 dst->f_dentry->d_inode->i_atime = src->f_dentry->d_inode->i_atime;
137 return;
138 }
139
140 struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *);
141 void autofs4_free_ino(struct autofs_info *);
142
143 /* Expiration */
144 int is_autofs4_dentry(struct dentry *);
145 int autofs4_expire_run(struct super_block *, struct vfsmount *,
146 struct autofs_sb_info *,
147 struct autofs_packet_expire __user *);
148 int autofs4_expire_multi(struct super_block *, struct vfsmount *,
149 struct autofs_sb_info *, int __user *);
150
151 /* Operations structures */
152
153 extern struct inode_operations autofs4_symlink_inode_operations;
154 extern struct inode_operations autofs4_dir_inode_operations;
155 extern struct inode_operations autofs4_root_inode_operations;
156 extern struct file_operations autofs4_dir_operations;
157 extern struct file_operations autofs4_root_operations;
158
159 /* Initializing function */
160
161 int autofs4_fill_super(struct super_block *, void *, int);
162 struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode);
163
164 /* Queue management functions */
165
166 enum autofs_notify
167 {
168 NFY_NONE,
169 NFY_MOUNT,
170 NFY_EXPIRE
171 };
172
173 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
174 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
175 void autofs4_catatonic_mode(struct autofs_sb_info *);
176
177 static inline int simple_positive(struct dentry *dentry)
178 {
179 return dentry->d_inode && !d_unhashed(dentry);
180 }
181
182 static inline int simple_empty_nolock(struct dentry *dentry)
183 {
184 struct dentry *child;
185 int ret = 0;
186
187 list_for_each_entry(child, &dentry->d_subdirs, d_child)
188 if (simple_positive(child))
189 goto out;
190 ret = 1;
191 out:
192 return ret;
193 }
194
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