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> | |
8d7b48e0 | 17 | #include <linux/auto_dev-ioctl.h> |
1d5599e3 | 18 | #include <linux/mutex.h> |
1da177e4 LT |
19 | #include <linux/list.h> |
20 | ||
21 | /* This is the range of ioctl() numbers we claim as ours */ | |
22 | #define AUTOFS_IOC_FIRST AUTOFS_IOC_READY | |
23 | #define AUTOFS_IOC_COUNT 32 | |
24 | ||
8d7b48e0 IK |
25 | #define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION) |
26 | #define AUTOFS_DEV_IOCTL_IOC_COUNT (AUTOFS_IOC_COUNT - 11) | |
27 | ||
1da177e4 LT |
28 | #include <linux/kernel.h> |
29 | #include <linux/slab.h> | |
30 | #include <linux/time.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/wait.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/mount.h> | |
35 | #include <linux/namei.h> | |
36 | #include <asm/current.h> | |
37 | #include <asm/uaccess.h> | |
38 | ||
39 | /* #define DEBUG */ | |
40 | ||
41 | #ifdef DEBUG | |
8d7b48e0 IK |
42 | #define DPRINTK(fmt, args...) \ |
43 | do { \ | |
44 | printk(KERN_DEBUG "pid %d: %s: " fmt "\n", \ | |
45 | current->pid, __func__, ##args); \ | |
46 | } while (0) | |
1da177e4 | 47 | #else |
8d7b48e0 | 48 | #define DPRINTK(fmt, args...) do {} while (0) |
1da177e4 LT |
49 | #endif |
50 | ||
8d7b48e0 IK |
51 | #define AUTOFS_WARN(fmt, args...) \ |
52 | do { \ | |
53 | printk(KERN_WARNING "pid %d: %s: " fmt "\n", \ | |
54 | current->pid, __func__, ##args); \ | |
55 | } while (0) | |
56 | ||
57 | #define AUTOFS_ERROR(fmt, args...) \ | |
58 | do { \ | |
59 | printk(KERN_ERR "pid %d: %s: " fmt "\n", \ | |
60 | current->pid, __func__, ##args); \ | |
61 | } while (0) | |
62 | ||
213614d5 IK |
63 | struct rehash_entry { |
64 | struct task_struct *task; | |
65 | struct list_head list; | |
66 | }; | |
67 | ||
1da177e4 LT |
68 | /* Unified info structure. This is pointed to by both the dentry and |
69 | inode structures. Each file in the filesystem has an instance of this | |
70 | structure. It holds a reference to the dentry, so dentries are never | |
71 | flushed while the file exists. All name lookups are dealt with at the | |
72 | dentry level, although the filesystem can interfere in the validation | |
73 | process. Readdir is implemented by traversing the dentry lists. */ | |
74 | struct autofs_info { | |
75 | struct dentry *dentry; | |
76 | struct inode *inode; | |
77 | ||
78 | int flags; | |
79 | ||
6e60a9ab IK |
80 | struct completion expire_complete; |
81 | ||
25767378 | 82 | struct list_head active; |
4f8427d1 | 83 | int active_count; |
213614d5 | 84 | struct list_head rehash_list; |
4f8427d1 | 85 | |
5f6f4f28 | 86 | struct list_head expiring; |
f50b6f86 | 87 | |
1da177e4 LT |
88 | struct autofs_sb_info *sbi; |
89 | unsigned long last_used; | |
1aff3c8b | 90 | atomic_t count; |
1da177e4 | 91 | |
c0f54d3e IK |
92 | uid_t uid; |
93 | gid_t gid; | |
94 | ||
1da177e4 LT |
95 | mode_t mode; |
96 | size_t size; | |
97 | ||
98 | void (*free)(struct autofs_info *); | |
99 | union { | |
100 | const char *symlink; | |
101 | } u; | |
102 | }; | |
103 | ||
104 | #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */ | |
6e60a9ab | 105 | #define AUTOFS_INF_MOUNTPOINT (1<<1) /* mountpoint status for direct expire */ |
aa952eb2 | 106 | #define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */ |
213614d5 | 107 | #define AUTOFS_INF_REHASH (1<<3) /* dentry in transit to ->lookup() */ |
1da177e4 LT |
108 | |
109 | struct autofs_wait_queue { | |
110 | wait_queue_head_t queue; | |
111 | struct autofs_wait_queue *next; | |
112 | autofs_wqt_t wait_queue_token; | |
113 | /* We use the following to see what we are waiting for */ | |
70b52a0a | 114 | struct qstr name; |
5c0a32fc IK |
115 | u32 dev; |
116 | u64 ino; | |
117 | uid_t uid; | |
118 | gid_t gid; | |
119 | pid_t pid; | |
120 | pid_t tgid; | |
1da177e4 LT |
121 | /* This is for status reporting upon return */ |
122 | int status; | |
296f7bf7 | 123 | unsigned int wait_ctr; |
1da177e4 LT |
124 | }; |
125 | ||
126 | #define AUTOFS_SBI_MAGIC 0x6d4a556d | |
127 | ||
128 | struct autofs_sb_info { | |
129 | u32 magic; | |
d7c4a5f1 | 130 | int pipefd; |
1da177e4 LT |
131 | struct file *pipe; |
132 | pid_t oz_pgrp; | |
133 | int catatonic; | |
134 | int version; | |
135 | int sub_version; | |
d7c4a5f1 IK |
136 | int min_proto; |
137 | int max_proto; | |
1da177e4 | 138 | unsigned long exp_timeout; |
34ca959c | 139 | unsigned int type; |
1da177e4 LT |
140 | int reghost_enabled; |
141 | int needs_reghost; | |
142 | struct super_block *sb; | |
1d5599e3 | 143 | struct mutex wq_mutex; |
3a9720ce | 144 | spinlock_t fs_lock; |
1da177e4 | 145 | struct autofs_wait_queue *queues; /* Wait queue pointer */ |
5f6f4f28 | 146 | spinlock_t lookup_lock; |
25767378 | 147 | struct list_head active_list; |
5f6f4f28 | 148 | struct list_head expiring_list; |
1da177e4 LT |
149 | }; |
150 | ||
151 | static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb) | |
152 | { | |
153 | return (struct autofs_sb_info *)(sb->s_fs_info); | |
154 | } | |
155 | ||
156 | static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry) | |
157 | { | |
158 | return (struct autofs_info *)(dentry->d_fsdata); | |
159 | } | |
160 | ||
161 | /* autofs4_oz_mode(): do we see the man behind the curtain? (The | |
162 | processes which do manipulations for us in user space sees the raw | |
163 | filesystem without "magic".) */ | |
164 | ||
165 | static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) { | |
a47afb0f | 166 | return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp; |
1da177e4 LT |
167 | } |
168 | ||
169 | /* Does a dentry have some pending activity? */ | |
170 | static inline int autofs4_ispending(struct dentry *dentry) | |
171 | { | |
172 | struct autofs_info *inf = autofs4_dentry_ino(dentry); | |
173 | ||
aa952eb2 | 174 | if (inf->flags & AUTOFS_INF_PENDING) |
3a9720ce IK |
175 | return 1; |
176 | ||
97e7449a IK |
177 | if (inf->flags & AUTOFS_INF_EXPIRING) |
178 | return 1; | |
3a9720ce | 179 | |
97e7449a | 180 | return 0; |
1da177e4 LT |
181 | } |
182 | ||
183 | static inline void autofs4_copy_atime(struct file *src, struct file *dst) | |
184 | { | |
a4669ed8 JJS |
185 | dst->f_path.dentry->d_inode->i_atime = |
186 | src->f_path.dentry->d_inode->i_atime; | |
1da177e4 LT |
187 | return; |
188 | } | |
189 | ||
190 | struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *); | |
191 | void autofs4_free_ino(struct autofs_info *); | |
192 | ||
193 | /* Expiration */ | |
194 | int is_autofs4_dentry(struct dentry *); | |
06a35985 | 195 | int autofs4_expire_wait(struct dentry *dentry); |
1da177e4 LT |
196 | int autofs4_expire_run(struct super_block *, struct vfsmount *, |
197 | struct autofs_sb_info *, | |
198 | struct autofs_packet_expire __user *); | |
56fcef75 IK |
199 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
200 | struct autofs_sb_info *sbi, int when); | |
1da177e4 LT |
201 | int autofs4_expire_multi(struct super_block *, struct vfsmount *, |
202 | struct autofs_sb_info *, int __user *); | |
8d7b48e0 IK |
203 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
204 | struct vfsmount *mnt, | |
205 | struct autofs_sb_info *sbi, int how); | |
206 | struct dentry *autofs4_expire_indirect(struct super_block *sb, | |
207 | struct vfsmount *mnt, | |
208 | struct autofs_sb_info *sbi, int how); | |
209 | ||
210 | /* Device node initialization */ | |
211 | ||
212 | int autofs_dev_ioctl_init(void); | |
213 | void autofs_dev_ioctl_exit(void); | |
1da177e4 LT |
214 | |
215 | /* Operations structures */ | |
216 | ||
754661f1 AV |
217 | extern const struct inode_operations autofs4_symlink_inode_operations; |
218 | extern const struct inode_operations autofs4_dir_inode_operations; | |
219 | extern const struct inode_operations autofs4_root_inode_operations; | |
220 | extern const struct inode_operations autofs4_indirect_root_inode_operations; | |
221 | extern const struct inode_operations autofs4_direct_root_inode_operations; | |
4b6f5d20 AV |
222 | extern const struct file_operations autofs4_dir_operations; |
223 | extern const struct file_operations autofs4_root_operations; | |
1da177e4 LT |
224 | |
225 | /* Initializing function */ | |
226 | ||
227 | int autofs4_fill_super(struct super_block *, void *, int); | |
228 | struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode); | |
229 | ||
230 | /* Queue management functions */ | |
231 | ||
1da177e4 LT |
232 | int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify); |
233 | int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); | |
234 | void autofs4_catatonic_mode(struct autofs_sb_info *); | |
235 | ||
9393bd07 | 236 | static inline int autofs4_follow_mount(struct path *path) |
9b1e3afd IK |
237 | { |
238 | int res = 0; | |
239 | ||
9393bd07 AV |
240 | while (d_mountpoint(path->dentry)) { |
241 | int followed = follow_down(path); | |
9b1e3afd IK |
242 | if (!followed) |
243 | break; | |
244 | res = 1; | |
245 | } | |
246 | return res; | |
247 | } | |
248 | ||
5c0a32fc IK |
249 | static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi) |
250 | { | |
251 | return new_encode_dev(sbi->sb->s_dev); | |
252 | } | |
253 | ||
254 | static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi) | |
255 | { | |
256 | return sbi->sb->s_root->d_inode->i_ino; | |
257 | } | |
258 | ||
1da177e4 LT |
259 | static inline int simple_positive(struct dentry *dentry) |
260 | { | |
261 | return dentry->d_inode && !d_unhashed(dentry); | |
262 | } | |
263 | ||
90a59c7c | 264 | static inline int __simple_empty(struct dentry *dentry) |
1da177e4 LT |
265 | { |
266 | struct dentry *child; | |
267 | int ret = 0; | |
268 | ||
5160ee6f | 269 | list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) |
1da177e4 LT |
270 | if (simple_positive(child)) |
271 | goto out; | |
272 | ret = 1; | |
273 | out: | |
274 | return ret; | |
275 | } | |
f5b95ff0 | 276 | |
c4cd70b3 IK |
277 | static inline void autofs4_add_expiring(struct dentry *dentry) |
278 | { | |
279 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
280 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
281 | if (ino) { | |
282 | spin_lock(&sbi->lookup_lock); | |
283 | if (list_empty(&ino->expiring)) | |
284 | list_add(&ino->expiring, &sbi->expiring_list); | |
285 | spin_unlock(&sbi->lookup_lock); | |
286 | } | |
287 | return; | |
288 | } | |
289 | ||
290 | static inline void autofs4_del_expiring(struct dentry *dentry) | |
291 | { | |
292 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
293 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
294 | if (ino) { | |
295 | spin_lock(&sbi->lookup_lock); | |
296 | if (!list_empty(&ino->expiring)) | |
297 | list_del_init(&ino->expiring); | |
298 | spin_unlock(&sbi->lookup_lock); | |
299 | } | |
300 | return; | |
301 | } | |
302 | ||
f5b95ff0 | 303 | void autofs4_dentry_release(struct dentry *); |
6ce31523 | 304 | extern void autofs4_kill_sb(struct super_block *); |