1 /* -*- c -*- ------------------------------------------------------------- *
3 * linux/fs/autofs/autofs_i.h
5 * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
6 * Copyright 2005-2006 Ian Kent <raven@themaw.net>
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.
12 * ----------------------------------------------------------------------- */
14 /* Internal header file for autofs */
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>
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
26 #define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION)
27 #define AUTOFS_DEV_IOCTL_IOC_COUNT (AUTOFS_IOC_COUNT - 11)
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>
43 #define DPRINTK(fmt, args...) \
45 printk(KERN_DEBUG "pid %d: %s: " fmt "\n", \
46 current->pid, __func__, ##args); \
49 #define DPRINTK(fmt, args...) do {} while (0)
52 #define AUTOFS_WARN(fmt, args...) \
54 printk(KERN_WARNING "pid %d: %s: " fmt "\n", \
55 current->pid, __func__, ##args); \
58 #define AUTOFS_ERROR(fmt, args...) \
60 printk(KERN_ERR "pid %d: %s: " fmt "\n", \
61 current->pid, __func__, ##args); \
64 extern spinlock_t autofs4_lock;
66 /* Unified info structure. This is pointed to by both the dentry and
67 inode structures. Each file in the filesystem has an instance of this
68 structure. It holds a reference to the dentry, so dentries are never
69 flushed while the file exists. All name lookups are dealt with at the
70 dentry level, although the filesystem can interfere in the validation
71 process. Readdir is implemented by traversing the dentry lists. */
73 struct dentry *dentry;
78 struct completion expire_complete;
80 struct list_head active;
83 struct list_head expiring;
85 struct autofs_sb_info *sbi;
86 unsigned long last_used;
95 #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
96 #define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
98 struct autofs_wait_queue {
99 wait_queue_head_t queue;
100 struct autofs_wait_queue *next;
101 autofs_wqt_t wait_queue_token;
102 /* We use the following to see what we are waiting for */
110 /* This is for status reporting upon return */
112 unsigned int wait_ctr;
115 #define AUTOFS_SBI_MAGIC 0x6d4a556d
117 struct autofs_sb_info {
127 unsigned long exp_timeout;
131 struct super_block *sb;
132 struct mutex wq_mutex;
134 struct autofs_wait_queue *queues; /* Wait queue pointer */
135 spinlock_t lookup_lock;
136 struct list_head active_list;
137 struct list_head expiring_list;
140 static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
142 return (struct autofs_sb_info *)(sb->s_fs_info);
145 static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
147 return (struct autofs_info *)(dentry->d_fsdata);
150 /* autofs4_oz_mode(): do we see the man behind the curtain? (The
151 processes which do manipulations for us in user space sees the raw
152 filesystem without "magic".) */
154 static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
155 return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp;
158 /* Does a dentry have some pending activity? */
159 static inline int autofs4_ispending(struct dentry *dentry)
161 struct autofs_info *inf = autofs4_dentry_ino(dentry);
163 if (inf->flags & AUTOFS_INF_PENDING)
166 if (inf->flags & AUTOFS_INF_EXPIRING)
172 struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *, mode_t);
173 void autofs4_free_ino(struct autofs_info *);
176 int is_autofs4_dentry(struct dentry *);
177 int autofs4_expire_wait(struct dentry *dentry);
178 int autofs4_expire_run(struct super_block *, struct vfsmount *,
179 struct autofs_sb_info *,
180 struct autofs_packet_expire __user *);
181 int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
182 struct autofs_sb_info *sbi, int when);
183 int autofs4_expire_multi(struct super_block *, struct vfsmount *,
184 struct autofs_sb_info *, int __user *);
185 struct dentry *autofs4_expire_direct(struct super_block *sb,
186 struct vfsmount *mnt,
187 struct autofs_sb_info *sbi, int how);
188 struct dentry *autofs4_expire_indirect(struct super_block *sb,
189 struct vfsmount *mnt,
190 struct autofs_sb_info *sbi, int how);
192 /* Device node initialization */
194 int autofs_dev_ioctl_init(void);
195 void autofs_dev_ioctl_exit(void);
197 /* Operations structures */
199 extern const struct inode_operations autofs4_symlink_inode_operations;
200 extern const struct inode_operations autofs4_dir_inode_operations;
201 extern const struct file_operations autofs4_dir_operations;
202 extern const struct file_operations autofs4_root_operations;
203 extern const struct dentry_operations autofs4_dentry_operations;
205 /* VFS automount flags management functions */
207 static inline void __managed_dentry_set_automount(struct dentry *dentry)
209 dentry->d_flags |= DCACHE_NEED_AUTOMOUNT;
212 static inline void managed_dentry_set_automount(struct dentry *dentry)
214 spin_lock(&dentry->d_lock);
215 __managed_dentry_set_automount(dentry);
216 spin_unlock(&dentry->d_lock);
219 static inline void __managed_dentry_clear_automount(struct dentry *dentry)
221 dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
224 static inline void managed_dentry_clear_automount(struct dentry *dentry)
226 spin_lock(&dentry->d_lock);
227 __managed_dentry_clear_automount(dentry);
228 spin_unlock(&dentry->d_lock);
231 static inline void __managed_dentry_set_transit(struct dentry *dentry)
233 dentry->d_flags |= DCACHE_MANAGE_TRANSIT;
236 static inline void managed_dentry_set_transit(struct dentry *dentry)
238 spin_lock(&dentry->d_lock);
239 __managed_dentry_set_transit(dentry);
240 spin_unlock(&dentry->d_lock);
243 static inline void __managed_dentry_clear_transit(struct dentry *dentry)
245 dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
248 static inline void managed_dentry_clear_transit(struct dentry *dentry)
250 spin_lock(&dentry->d_lock);
251 __managed_dentry_clear_transit(dentry);
252 spin_unlock(&dentry->d_lock);
255 static inline void __managed_dentry_set_managed(struct dentry *dentry)
257 dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
260 static inline void managed_dentry_set_managed(struct dentry *dentry)
262 spin_lock(&dentry->d_lock);
263 __managed_dentry_set_managed(dentry);
264 spin_unlock(&dentry->d_lock);
267 static inline void __managed_dentry_clear_managed(struct dentry *dentry)
269 dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
272 static inline void managed_dentry_clear_managed(struct dentry *dentry)
274 spin_lock(&dentry->d_lock);
275 __managed_dentry_clear_managed(dentry);
276 spin_unlock(&dentry->d_lock);
279 /* Initializing function */
281 int autofs4_fill_super(struct super_block *, void *, int);
282 struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi);
284 /* Queue management functions */
286 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
287 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
288 void autofs4_catatonic_mode(struct autofs_sb_info *);
290 static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
292 return new_encode_dev(sbi->sb->s_dev);
295 static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
297 return sbi->sb->s_root->d_inode->i_ino;
300 static inline int simple_positive(struct dentry *dentry)
302 return dentry->d_inode && !d_unhashed(dentry);
305 static inline void __autofs4_add_expiring(struct dentry *dentry)
307 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
308 struct autofs_info *ino = autofs4_dentry_ino(dentry);
310 if (list_empty(&ino->expiring))
311 list_add(&ino->expiring, &sbi->expiring_list);
316 static inline void autofs4_add_expiring(struct dentry *dentry)
318 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
319 struct autofs_info *ino = autofs4_dentry_ino(dentry);
321 spin_lock(&sbi->lookup_lock);
322 if (list_empty(&ino->expiring))
323 list_add(&ino->expiring, &sbi->expiring_list);
324 spin_unlock(&sbi->lookup_lock);
329 static inline void autofs4_del_expiring(struct dentry *dentry)
331 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
332 struct autofs_info *ino = autofs4_dentry_ino(dentry);
334 spin_lock(&sbi->lookup_lock);
335 if (!list_empty(&ino->expiring))
336 list_del_init(&ino->expiring);
337 spin_unlock(&sbi->lookup_lock);
342 void autofs4_dentry_release(struct dentry *);
343 extern void autofs4_kill_sb(struct super_block *);