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1 | /* -*- c -*- ------------------------------------------------------------- * |
2 | * |
3 | * linux/fs/autofs/autofs_i.h |
4 | * |
5 | * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved |
6 | * Copyright 2005-2006 Ian Kent <raven@themaw.net> |
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> |
17 | #include <linux/auto_dev-ioctl.h> |
18 | #include <linux/mutex.h> |
19 | #include <linux/spinlock.h> |
20 | #include <linux/list.h> |
21 | |
22 | /* This is the range of ioctl() numbers we claim as ours */ |
23 | #define AUTOFS_IOC_FIRST AUTOFS_IOC_READY |
24 | #define AUTOFS_IOC_COUNT 32 |
25 | |
26 | #define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION) |
27 | #define AUTOFS_DEV_IOCTL_IOC_COUNT (AUTOFS_IOC_COUNT - 11) |
28 | |
29 | #include <linux/kernel.h> |
30 | #include <linux/slab.h> |
31 | #include <linux/time.h> |
32 | #include <linux/string.h> |
33 | #include <linux/wait.h> |
34 | #include <linux/sched.h> |
35 | #include <linux/mount.h> |
36 | #include <linux/namei.h> |
37 | #include <asm/current.h> |
38 | #include <asm/uaccess.h> |
39 | |
40 | /* #define DEBUG */ |
41 | |
42 | #ifdef DEBUG |
43 | #define DPRINTK(fmt, args...) \ |
44 | do { \ |
45 | printk(KERN_DEBUG "pid %d: %s: " fmt "\n", \ |
46 | current->pid, __func__, ##args); \ |
47 | } while (0) |
48 | #else |
49 | #define DPRINTK(fmt, args...) do {} while (0) |
50 | #endif |
51 | |
52 | #define AUTOFS_WARN(fmt, args...) \ |
53 | do { \ |
54 | printk(KERN_WARNING "pid %d: %s: " fmt "\n", \ |
55 | current->pid, __func__, ##args); \ |
56 | } while (0) |
57 | |
58 | #define AUTOFS_ERROR(fmt, args...) \ |
59 | do { \ |
60 | printk(KERN_ERR "pid %d: %s: " fmt "\n", \ |
61 | current->pid, __func__, ##args); \ |
62 | } while (0) |
63 | |
64 | /* Unified info structure. This is pointed to by both the dentry and |
65 | inode structures. Each file in the filesystem has an instance of this |
66 | structure. It holds a reference to the dentry, so dentries are never |
67 | flushed while the file exists. All name lookups are dealt with at the |
68 | dentry level, although the filesystem can interfere in the validation |
69 | process. Readdir is implemented by traversing the dentry lists. */ |
70 | struct autofs_info { |
71 | struct dentry *dentry; |
72 | struct inode *inode; |
73 | |
74 | int flags; |
75 | |
76 | struct completion expire_complete; |
77 | |
78 | struct list_head active; |
79 | int active_count; |
80 | |
81 | struct list_head expiring; |
82 | |
83 | struct autofs_sb_info *sbi; |
84 | unsigned long last_used; |
85 | atomic_t count; |
86 | |
87 | uid_t uid; |
88 | gid_t gid; |
89 | }; |
90 | |
91 | #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */ |
92 | #define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */ |
93 | |
94 | struct autofs_wait_queue { |
95 | wait_queue_head_t queue; |
96 | struct autofs_wait_queue *next; |
97 | autofs_wqt_t wait_queue_token; |
98 | /* We use the following to see what we are waiting for */ |
99 | struct qstr name; |
100 | u32 dev; |
101 | u64 ino; |
102 | uid_t uid; |
103 | gid_t gid; |
104 | pid_t pid; |
105 | pid_t tgid; |
106 | /* This is for status reporting upon return */ |
107 | int status; |
108 | unsigned int wait_ctr; |
109 | }; |
110 | |
111 | #define AUTOFS_SBI_MAGIC 0x6d4a556d |
112 | |
113 | struct autofs_sb_info { |
114 | u32 magic; |
115 | int pipefd; |
116 | struct file *pipe; |
117 | pid_t oz_pgrp; |
118 | int catatonic; |
119 | int version; |
120 | int sub_version; |
121 | int min_proto; |
122 | int max_proto; |
123 | unsigned long exp_timeout; |
124 | unsigned int type; |
125 | int reghost_enabled; |
126 | int needs_reghost; |
127 | struct super_block *sb; |
128 | struct mutex wq_mutex; |
129 | spinlock_t fs_lock; |
130 | struct autofs_wait_queue *queues; /* Wait queue pointer */ |
131 | spinlock_t lookup_lock; |
132 | struct list_head active_list; |
133 | struct list_head expiring_list; |
134 | }; |
135 | |
136 | static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb) |
137 | { |
138 | return (struct autofs_sb_info *)(sb->s_fs_info); |
139 | } |
140 | |
141 | static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry) |
142 | { |
143 | return (struct autofs_info *)(dentry->d_fsdata); |
144 | } |
145 | |
146 | /* autofs4_oz_mode(): do we see the man behind the curtain? (The |
147 | processes which do manipulations for us in user space sees the raw |
148 | filesystem without "magic".) */ |
149 | |
150 | static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) { |
151 | return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp; |
152 | } |
153 | |
154 | /* Does a dentry have some pending activity? */ |
155 | static inline int autofs4_ispending(struct dentry *dentry) |
156 | { |
157 | struct autofs_info *inf = autofs4_dentry_ino(dentry); |
158 | |
159 | if (inf->flags & AUTOFS_INF_PENDING) |
160 | return 1; |
161 | |
162 | if (inf->flags & AUTOFS_INF_EXPIRING) |
163 | return 1; |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | struct inode *autofs4_get_inode(struct super_block *, mode_t); |
169 | void autofs4_free_ino(struct autofs_info *); |
170 | |
171 | /* Expiration */ |
172 | int is_autofs4_dentry(struct dentry *); |
173 | int autofs4_expire_wait(struct dentry *dentry); |
174 | int autofs4_expire_run(struct super_block *, struct vfsmount *, |
175 | struct autofs_sb_info *, |
176 | struct autofs_packet_expire __user *); |
177 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
178 | struct autofs_sb_info *sbi, int when); |
179 | int autofs4_expire_multi(struct super_block *, struct vfsmount *, |
180 | struct autofs_sb_info *, int __user *); |
181 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
182 | struct vfsmount *mnt, |
183 | struct autofs_sb_info *sbi, int how); |
184 | struct dentry *autofs4_expire_indirect(struct super_block *sb, |
185 | struct vfsmount *mnt, |
186 | struct autofs_sb_info *sbi, int how); |
187 | |
188 | /* Device node initialization */ |
189 | |
190 | int autofs_dev_ioctl_init(void); |
191 | void autofs_dev_ioctl_exit(void); |
192 | |
193 | /* Operations structures */ |
194 | |
195 | extern const struct inode_operations autofs4_symlink_inode_operations; |
196 | extern const struct inode_operations autofs4_dir_inode_operations; |
197 | extern const struct file_operations autofs4_dir_operations; |
198 | extern const struct file_operations autofs4_root_operations; |
199 | extern const struct dentry_operations autofs4_dentry_operations; |
200 | |
201 | /* VFS automount flags management functions */ |
202 | |
203 | static inline void __managed_dentry_set_automount(struct dentry *dentry) |
204 | { |
205 | dentry->d_flags |= DCACHE_NEED_AUTOMOUNT; |
206 | } |
207 | |
208 | static inline void managed_dentry_set_automount(struct dentry *dentry) |
209 | { |
210 | spin_lock(&dentry->d_lock); |
211 | __managed_dentry_set_automount(dentry); |
212 | spin_unlock(&dentry->d_lock); |
213 | } |
214 | |
215 | static inline void __managed_dentry_clear_automount(struct dentry *dentry) |
216 | { |
217 | dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT; |
218 | } |
219 | |
220 | static inline void managed_dentry_clear_automount(struct dentry *dentry) |
221 | { |
222 | spin_lock(&dentry->d_lock); |
223 | __managed_dentry_clear_automount(dentry); |
224 | spin_unlock(&dentry->d_lock); |
225 | } |
226 | |
227 | static inline void __managed_dentry_set_transit(struct dentry *dentry) |
228 | { |
229 | dentry->d_flags |= DCACHE_MANAGE_TRANSIT; |
230 | } |
231 | |
232 | static inline void managed_dentry_set_transit(struct dentry *dentry) |
233 | { |
234 | spin_lock(&dentry->d_lock); |
235 | __managed_dentry_set_transit(dentry); |
236 | spin_unlock(&dentry->d_lock); |
237 | } |
238 | |
239 | static inline void __managed_dentry_clear_transit(struct dentry *dentry) |
240 | { |
241 | dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT; |
242 | } |
243 | |
244 | static inline void managed_dentry_clear_transit(struct dentry *dentry) |
245 | { |
246 | spin_lock(&dentry->d_lock); |
247 | __managed_dentry_clear_transit(dentry); |
248 | spin_unlock(&dentry->d_lock); |
249 | } |
250 | |
251 | static inline void __managed_dentry_set_managed(struct dentry *dentry) |
252 | { |
253 | dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT); |
254 | } |
255 | |
256 | static inline void managed_dentry_set_managed(struct dentry *dentry) |
257 | { |
258 | spin_lock(&dentry->d_lock); |
259 | __managed_dentry_set_managed(dentry); |
260 | spin_unlock(&dentry->d_lock); |
261 | } |
262 | |
263 | static inline void __managed_dentry_clear_managed(struct dentry *dentry) |
264 | { |
265 | dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT); |
266 | } |
267 | |
268 | static inline void managed_dentry_clear_managed(struct dentry *dentry) |
269 | { |
270 | spin_lock(&dentry->d_lock); |
271 | __managed_dentry_clear_managed(dentry); |
272 | spin_unlock(&dentry->d_lock); |
273 | } |
274 | |
275 | /* Initializing function */ |
276 | |
277 | int autofs4_fill_super(struct super_block *, void *, int); |
278 | struct autofs_info *autofs4_new_ino(struct autofs_sb_info *); |
279 | void autofs4_clean_ino(struct autofs_info *); |
280 | |
281 | /* Queue management functions */ |
282 | |
283 | int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify); |
284 | int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); |
285 | void autofs4_catatonic_mode(struct autofs_sb_info *); |
286 | |
287 | static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi) |
288 | { |
289 | return new_encode_dev(sbi->sb->s_dev); |
290 | } |
291 | |
292 | static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi) |
293 | { |
294 | return sbi->sb->s_root->d_inode->i_ino; |
295 | } |
296 | |
297 | static inline int simple_positive(struct dentry *dentry) |
298 | { |
299 | return dentry->d_inode && !d_unhashed(dentry); |
300 | } |
301 | |
302 | static inline void __autofs4_add_expiring(struct dentry *dentry) |
303 | { |
304 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
305 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
306 | if (ino) { |
307 | if (list_empty(&ino->expiring)) |
308 | list_add(&ino->expiring, &sbi->expiring_list); |
309 | } |
310 | return; |
311 | } |
312 | |
313 | static inline void autofs4_add_expiring(struct dentry *dentry) |
314 | { |
315 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
316 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
317 | if (ino) { |
318 | spin_lock(&sbi->lookup_lock); |
319 | if (list_empty(&ino->expiring)) |
320 | list_add(&ino->expiring, &sbi->expiring_list); |
321 | spin_unlock(&sbi->lookup_lock); |
322 | } |
323 | return; |
324 | } |
325 | |
326 | static inline void autofs4_del_expiring(struct dentry *dentry) |
327 | { |
328 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); |
329 | struct autofs_info *ino = autofs4_dentry_ino(dentry); |
330 | if (ino) { |
331 | spin_lock(&sbi->lookup_lock); |
332 | if (!list_empty(&ino->expiring)) |
333 | list_del_init(&ino->expiring); |
334 | spin_unlock(&sbi->lookup_lock); |
335 | } |
336 | return; |
337 | } |
338 | |
339 | extern void autofs4_kill_sb(struct super_block *); |
340 |
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