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1da177e4 LT |
1 | /* -*- c -*- ------------------------------------------------------------- * |
2 | * | |
3 | * linux/fs/autofs/autofs_i.h | |
4 | * | |
5 | * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved | |
34ca959c | 6 | * Copyright 2005-2006 Ian Kent <raven@themaw.net> |
1da177e4 LT |
7 | * |
8 | * This file is part of the Linux kernel and is made available under | |
9 | * the terms of the GNU General Public License, version 2, or at your | |
10 | * option, any later version, incorporated herein by reference. | |
11 | * | |
12 | * ----------------------------------------------------------------------- */ | |
13 | ||
14 | /* Internal header file for autofs */ | |
15 | ||
16 | #include <linux/auto_fs4.h> | |
1d5599e3 | 17 | #include <linux/mutex.h> |
1da177e4 LT |
18 | #include <linux/list.h> |
19 | ||
20 | /* This is the range of ioctl() numbers we claim as ours */ | |
21 | #define AUTOFS_IOC_FIRST AUTOFS_IOC_READY | |
22 | #define AUTOFS_IOC_COUNT 32 | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/wait.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/mount.h> | |
31 | #include <linux/namei.h> | |
32 | #include <asm/current.h> | |
33 | #include <asm/uaccess.h> | |
34 | ||
35 | /* #define DEBUG */ | |
36 | ||
37 | #ifdef DEBUG | |
38 | #define DPRINTK(fmt,args...) do { printk(KERN_DEBUG "pid %d: %s: " fmt "\n" , current->pid , __FUNCTION__ , ##args); } while(0) | |
39 | #else | |
40 | #define DPRINTK(fmt,args...) do {} while(0) | |
41 | #endif | |
42 | ||
1da177e4 LT |
43 | /* Unified info structure. This is pointed to by both the dentry and |
44 | inode structures. Each file in the filesystem has an instance of this | |
45 | structure. It holds a reference to the dentry, so dentries are never | |
46 | flushed while the file exists. All name lookups are dealt with at the | |
47 | dentry level, although the filesystem can interfere in the validation | |
48 | process. Readdir is implemented by traversing the dentry lists. */ | |
49 | struct autofs_info { | |
50 | struct dentry *dentry; | |
51 | struct inode *inode; | |
52 | ||
53 | int flags; | |
54 | ||
55 | struct autofs_sb_info *sbi; | |
56 | unsigned long last_used; | |
1aff3c8b | 57 | atomic_t count; |
1da177e4 LT |
58 | |
59 | mode_t mode; | |
60 | size_t size; | |
61 | ||
62 | void (*free)(struct autofs_info *); | |
63 | union { | |
64 | const char *symlink; | |
65 | } u; | |
66 | }; | |
67 | ||
68 | #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */ | |
69 | ||
70 | struct autofs_wait_queue { | |
71 | wait_queue_head_t queue; | |
72 | struct autofs_wait_queue *next; | |
73 | autofs_wqt_t wait_queue_token; | |
74 | /* We use the following to see what we are waiting for */ | |
a5370553 IK |
75 | unsigned int hash; |
76 | unsigned int len; | |
1da177e4 | 77 | char *name; |
5c0a32fc IK |
78 | u32 dev; |
79 | u64 ino; | |
80 | uid_t uid; | |
81 | gid_t gid; | |
82 | pid_t pid; | |
83 | pid_t tgid; | |
1da177e4 LT |
84 | /* This is for status reporting upon return */ |
85 | int status; | |
86 | atomic_t wait_ctr; | |
87 | }; | |
88 | ||
89 | #define AUTOFS_SBI_MAGIC 0x6d4a556d | |
90 | ||
44d53eb0 IK |
91 | #define AUTOFS_TYPE_INDIRECT 0x0001 |
92 | #define AUTOFS_TYPE_DIRECT 0x0002 | |
93 | #define AUTOFS_TYPE_OFFSET 0x0004 | |
34ca959c | 94 | |
1da177e4 LT |
95 | struct autofs_sb_info { |
96 | u32 magic; | |
d7c4a5f1 | 97 | int pipefd; |
1da177e4 LT |
98 | struct file *pipe; |
99 | pid_t oz_pgrp; | |
100 | int catatonic; | |
101 | int version; | |
102 | int sub_version; | |
d7c4a5f1 IK |
103 | int min_proto; |
104 | int max_proto; | |
1da177e4 | 105 | unsigned long exp_timeout; |
34ca959c | 106 | unsigned int type; |
1da177e4 LT |
107 | int reghost_enabled; |
108 | int needs_reghost; | |
109 | struct super_block *sb; | |
1d5599e3 | 110 | struct mutex wq_mutex; |
3a9720ce | 111 | spinlock_t fs_lock; |
1da177e4 LT |
112 | struct autofs_wait_queue *queues; /* Wait queue pointer */ |
113 | }; | |
114 | ||
115 | static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb) | |
116 | { | |
117 | return (struct autofs_sb_info *)(sb->s_fs_info); | |
118 | } | |
119 | ||
120 | static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry) | |
121 | { | |
122 | return (struct autofs_info *)(dentry->d_fsdata); | |
123 | } | |
124 | ||
125 | /* autofs4_oz_mode(): do we see the man behind the curtain? (The | |
126 | processes which do manipulations for us in user space sees the raw | |
127 | filesystem without "magic".) */ | |
128 | ||
129 | static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) { | |
130 | return sbi->catatonic || process_group(current) == sbi->oz_pgrp; | |
131 | } | |
132 | ||
133 | /* Does a dentry have some pending activity? */ | |
134 | static inline int autofs4_ispending(struct dentry *dentry) | |
135 | { | |
136 | struct autofs_info *inf = autofs4_dentry_ino(dentry); | |
3a9720ce | 137 | int pending = 0; |
1da177e4 | 138 | |
3a9720ce IK |
139 | if (dentry->d_flags & DCACHE_AUTOFS_PENDING) |
140 | return 1; | |
141 | ||
142 | if (inf) { | |
143 | spin_lock(&inf->sbi->fs_lock); | |
144 | pending = inf->flags & AUTOFS_INF_EXPIRING; | |
145 | spin_unlock(&inf->sbi->fs_lock); | |
146 | } | |
147 | ||
148 | return pending; | |
1da177e4 LT |
149 | } |
150 | ||
151 | static inline void autofs4_copy_atime(struct file *src, struct file *dst) | |
152 | { | |
a4669ed8 JJS |
153 | dst->f_path.dentry->d_inode->i_atime = |
154 | src->f_path.dentry->d_inode->i_atime; | |
1da177e4 LT |
155 | return; |
156 | } | |
157 | ||
158 | struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *); | |
159 | void autofs4_free_ino(struct autofs_info *); | |
160 | ||
161 | /* Expiration */ | |
162 | int is_autofs4_dentry(struct dentry *); | |
163 | int autofs4_expire_run(struct super_block *, struct vfsmount *, | |
164 | struct autofs_sb_info *, | |
165 | struct autofs_packet_expire __user *); | |
166 | int autofs4_expire_multi(struct super_block *, struct vfsmount *, | |
167 | struct autofs_sb_info *, int __user *); | |
168 | ||
169 | /* Operations structures */ | |
170 | ||
754661f1 AV |
171 | extern const struct inode_operations autofs4_symlink_inode_operations; |
172 | extern const struct inode_operations autofs4_dir_inode_operations; | |
173 | extern const struct inode_operations autofs4_root_inode_operations; | |
174 | extern const struct inode_operations autofs4_indirect_root_inode_operations; | |
175 | extern const struct inode_operations autofs4_direct_root_inode_operations; | |
4b6f5d20 AV |
176 | extern const struct file_operations autofs4_dir_operations; |
177 | extern const struct file_operations autofs4_root_operations; | |
1da177e4 LT |
178 | |
179 | /* Initializing function */ | |
180 | ||
181 | int autofs4_fill_super(struct super_block *, void *, int); | |
182 | struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode); | |
183 | ||
184 | /* Queue management functions */ | |
185 | ||
1da177e4 LT |
186 | int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify); |
187 | int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); | |
188 | void autofs4_catatonic_mode(struct autofs_sb_info *); | |
189 | ||
9b1e3afd IK |
190 | static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **dentry) |
191 | { | |
192 | int res = 0; | |
193 | ||
194 | while (d_mountpoint(*dentry)) { | |
195 | int followed = follow_down(mnt, dentry); | |
196 | if (!followed) | |
197 | break; | |
198 | res = 1; | |
199 | } | |
200 | return res; | |
201 | } | |
202 | ||
5c0a32fc IK |
203 | static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi) |
204 | { | |
205 | return new_encode_dev(sbi->sb->s_dev); | |
206 | } | |
207 | ||
208 | static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi) | |
209 | { | |
210 | return sbi->sb->s_root->d_inode->i_ino; | |
211 | } | |
212 | ||
1da177e4 LT |
213 | static inline int simple_positive(struct dentry *dentry) |
214 | { | |
215 | return dentry->d_inode && !d_unhashed(dentry); | |
216 | } | |
217 | ||
90a59c7c | 218 | static inline int __simple_empty(struct dentry *dentry) |
1da177e4 LT |
219 | { |
220 | struct dentry *child; | |
221 | int ret = 0; | |
222 | ||
5160ee6f | 223 | list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) |
1da177e4 LT |
224 | if (simple_positive(child)) |
225 | goto out; | |
226 | ret = 1; | |
227 | out: | |
228 | return ret; | |
229 | } | |
f5b95ff0 AB |
230 | |
231 | void autofs4_dentry_release(struct dentry *); | |
6ce31523 | 232 | extern void autofs4_kill_sb(struct super_block *); |