Commit | Line | Data |
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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 | |
8e24eea7 | 38 | #define DPRINTK(fmt,args...) do { printk(KERN_DEBUG "pid %d: %s: " fmt "\n" , current->pid , __func__ , ##args); } while(0) |
1da177e4 LT |
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 | ||
25767378 | 55 | struct list_head active; |
5f6f4f28 | 56 | struct list_head expiring; |
f50b6f86 | 57 | |
1da177e4 LT |
58 | struct autofs_sb_info *sbi; |
59 | unsigned long last_used; | |
1aff3c8b | 60 | atomic_t count; |
1da177e4 LT |
61 | |
62 | mode_t mode; | |
63 | size_t size; | |
64 | ||
65 | void (*free)(struct autofs_info *); | |
66 | union { | |
67 | const char *symlink; | |
68 | } u; | |
69 | }; | |
70 | ||
71 | #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */ | |
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 */ | |
a5370553 IK |
78 | unsigned int hash; |
79 | unsigned int len; | |
1da177e4 | 80 | char *name; |
5c0a32fc IK |
81 | u32 dev; |
82 | u64 ino; | |
83 | uid_t uid; | |
84 | gid_t gid; | |
85 | pid_t pid; | |
86 | pid_t tgid; | |
1da177e4 LT |
87 | /* This is for status reporting upon return */ |
88 | int status; | |
89 | atomic_t wait_ctr; | |
90 | }; | |
91 | ||
92 | #define AUTOFS_SBI_MAGIC 0x6d4a556d | |
93 | ||
44d53eb0 IK |
94 | #define AUTOFS_TYPE_INDIRECT 0x0001 |
95 | #define AUTOFS_TYPE_DIRECT 0x0002 | |
96 | #define AUTOFS_TYPE_OFFSET 0x0004 | |
34ca959c | 97 | |
1da177e4 LT |
98 | struct autofs_sb_info { |
99 | u32 magic; | |
d7c4a5f1 | 100 | int pipefd; |
1da177e4 LT |
101 | struct file *pipe; |
102 | pid_t oz_pgrp; | |
103 | int catatonic; | |
104 | int version; | |
105 | int sub_version; | |
d7c4a5f1 IK |
106 | int min_proto; |
107 | int max_proto; | |
1da177e4 | 108 | unsigned long exp_timeout; |
34ca959c | 109 | unsigned int type; |
1da177e4 LT |
110 | int reghost_enabled; |
111 | int needs_reghost; | |
112 | struct super_block *sb; | |
1d5599e3 | 113 | struct mutex wq_mutex; |
3a9720ce | 114 | spinlock_t fs_lock; |
1da177e4 | 115 | struct autofs_wait_queue *queues; /* Wait queue pointer */ |
5f6f4f28 | 116 | spinlock_t lookup_lock; |
25767378 | 117 | struct list_head active_list; |
5f6f4f28 | 118 | struct list_head expiring_list; |
1da177e4 LT |
119 | }; |
120 | ||
121 | static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb) | |
122 | { | |
123 | return (struct autofs_sb_info *)(sb->s_fs_info); | |
124 | } | |
125 | ||
126 | static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry) | |
127 | { | |
128 | return (struct autofs_info *)(dentry->d_fsdata); | |
129 | } | |
130 | ||
131 | /* autofs4_oz_mode(): do we see the man behind the curtain? (The | |
132 | processes which do manipulations for us in user space sees the raw | |
133 | filesystem without "magic".) */ | |
134 | ||
135 | static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) { | |
a47afb0f | 136 | return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp; |
1da177e4 LT |
137 | } |
138 | ||
139 | /* Does a dentry have some pending activity? */ | |
140 | static inline int autofs4_ispending(struct dentry *dentry) | |
141 | { | |
142 | struct autofs_info *inf = autofs4_dentry_ino(dentry); | |
3a9720ce | 143 | int pending = 0; |
1da177e4 | 144 | |
3a9720ce IK |
145 | if (dentry->d_flags & DCACHE_AUTOFS_PENDING) |
146 | return 1; | |
147 | ||
148 | if (inf) { | |
149 | spin_lock(&inf->sbi->fs_lock); | |
150 | pending = inf->flags & AUTOFS_INF_EXPIRING; | |
151 | spin_unlock(&inf->sbi->fs_lock); | |
152 | } | |
153 | ||
154 | return pending; | |
1da177e4 LT |
155 | } |
156 | ||
157 | static inline void autofs4_copy_atime(struct file *src, struct file *dst) | |
158 | { | |
a4669ed8 JJS |
159 | dst->f_path.dentry->d_inode->i_atime = |
160 | src->f_path.dentry->d_inode->i_atime; | |
1da177e4 LT |
161 | return; |
162 | } | |
163 | ||
164 | struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *); | |
165 | void autofs4_free_ino(struct autofs_info *); | |
166 | ||
167 | /* Expiration */ | |
168 | int is_autofs4_dentry(struct dentry *); | |
169 | int autofs4_expire_run(struct super_block *, struct vfsmount *, | |
170 | struct autofs_sb_info *, | |
171 | struct autofs_packet_expire __user *); | |
172 | int autofs4_expire_multi(struct super_block *, struct vfsmount *, | |
173 | struct autofs_sb_info *, int __user *); | |
174 | ||
175 | /* Operations structures */ | |
176 | ||
754661f1 AV |
177 | extern const struct inode_operations autofs4_symlink_inode_operations; |
178 | extern const struct inode_operations autofs4_dir_inode_operations; | |
179 | extern const struct inode_operations autofs4_root_inode_operations; | |
180 | extern const struct inode_operations autofs4_indirect_root_inode_operations; | |
181 | extern const struct inode_operations autofs4_direct_root_inode_operations; | |
4b6f5d20 AV |
182 | extern const struct file_operations autofs4_dir_operations; |
183 | extern const struct file_operations autofs4_root_operations; | |
1da177e4 LT |
184 | |
185 | /* Initializing function */ | |
186 | ||
187 | int autofs4_fill_super(struct super_block *, void *, int); | |
188 | struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode); | |
189 | ||
190 | /* Queue management functions */ | |
191 | ||
1da177e4 LT |
192 | int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify); |
193 | int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); | |
194 | void autofs4_catatonic_mode(struct autofs_sb_info *); | |
195 | ||
9b1e3afd IK |
196 | static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **dentry) |
197 | { | |
198 | int res = 0; | |
199 | ||
200 | while (d_mountpoint(*dentry)) { | |
201 | int followed = follow_down(mnt, dentry); | |
202 | if (!followed) | |
203 | break; | |
204 | res = 1; | |
205 | } | |
206 | return res; | |
207 | } | |
208 | ||
5c0a32fc IK |
209 | static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi) |
210 | { | |
211 | return new_encode_dev(sbi->sb->s_dev); | |
212 | } | |
213 | ||
214 | static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi) | |
215 | { | |
216 | return sbi->sb->s_root->d_inode->i_ino; | |
217 | } | |
218 | ||
1da177e4 LT |
219 | static inline int simple_positive(struct dentry *dentry) |
220 | { | |
221 | return dentry->d_inode && !d_unhashed(dentry); | |
222 | } | |
223 | ||
90a59c7c | 224 | static inline int __simple_empty(struct dentry *dentry) |
1da177e4 LT |
225 | { |
226 | struct dentry *child; | |
227 | int ret = 0; | |
228 | ||
5160ee6f | 229 | list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) |
1da177e4 LT |
230 | if (simple_positive(child)) |
231 | goto out; | |
232 | ret = 1; | |
233 | out: | |
234 | return ret; | |
235 | } | |
f5b95ff0 AB |
236 | |
237 | void autofs4_dentry_release(struct dentry *); | |
6ce31523 | 238 | extern void autofs4_kill_sb(struct super_block *); |