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>
42 #define DPRINTK(fmt, ...) \
43 pr_debug("pid %d: %s: " fmt "\n", \
44 current->pid, __func__, ##__VA_ARGS__)
46 #define AUTOFS_WARN(fmt, ...) \
47 printk(KERN_WARNING "pid %d: %s: " fmt "\n", \
48 current->pid, __func__, ##__VA_ARGS__)
50 #define AUTOFS_ERROR(fmt, ...) \
51 printk(KERN_ERR "pid %d: %s: " fmt "\n", \
52 current->pid, __func__, ##__VA_ARGS__)
54 /* Unified info structure. This is pointed to by both the dentry and
55 inode structures. Each file in the filesystem has an instance of this
56 structure. It holds a reference to the dentry, so dentries are never
57 flushed while the file exists. All name lookups are dealt with at the
58 dentry level, although the filesystem can interfere in the validation
59 process. Readdir is implemented by traversing the dentry lists. */
61 struct dentry *dentry;
66 struct completion expire_complete;
68 struct list_head active;
71 struct list_head expiring;
73 struct autofs_sb_info *sbi;
74 unsigned long last_used;
81 #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
82 #define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
84 struct autofs_wait_queue {
85 wait_queue_head_t queue;
86 struct autofs_wait_queue *next;
87 autofs_wqt_t wait_queue_token;
88 /* We use the following to see what we are waiting for */
96 /* This is for status reporting upon return */
98 unsigned int wait_ctr;
101 #define AUTOFS_SBI_MAGIC 0x6d4a556d
103 struct autofs_sb_info {
113 unsigned long exp_timeout;
117 struct super_block *sb;
118 struct mutex wq_mutex;
119 struct mutex pipe_mutex;
121 struct autofs_wait_queue *queues; /* Wait queue pointer */
122 spinlock_t lookup_lock;
123 struct list_head active_list;
124 struct list_head expiring_list;
128 static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
130 return (struct autofs_sb_info *)(sb->s_fs_info);
133 static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
135 return (struct autofs_info *)(dentry->d_fsdata);
138 /* autofs4_oz_mode(): do we see the man behind the curtain? (The
139 processes which do manipulations for us in user space sees the raw
140 filesystem without "magic".) */
142 static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
143 return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp;
146 struct inode *autofs4_get_inode(struct super_block *, umode_t);
147 void autofs4_free_ino(struct autofs_info *);
150 int is_autofs4_dentry(struct dentry *);
151 int autofs4_expire_wait(struct dentry *dentry);
152 int autofs4_expire_run(struct super_block *, struct vfsmount *,
153 struct autofs_sb_info *,
154 struct autofs_packet_expire __user *);
155 int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
156 struct autofs_sb_info *sbi, int when);
157 int autofs4_expire_multi(struct super_block *, struct vfsmount *,
158 struct autofs_sb_info *, int __user *);
159 struct dentry *autofs4_expire_direct(struct super_block *sb,
160 struct vfsmount *mnt,
161 struct autofs_sb_info *sbi, int how);
162 struct dentry *autofs4_expire_indirect(struct super_block *sb,
163 struct vfsmount *mnt,
164 struct autofs_sb_info *sbi, int how);
166 /* Device node initialization */
168 int autofs_dev_ioctl_init(void);
169 void autofs_dev_ioctl_exit(void);
171 /* Operations structures */
173 extern const struct inode_operations autofs4_symlink_inode_operations;
174 extern const struct inode_operations autofs4_dir_inode_operations;
175 extern const struct file_operations autofs4_dir_operations;
176 extern const struct file_operations autofs4_root_operations;
177 extern const struct dentry_operations autofs4_dentry_operations;
179 /* VFS automount flags management functions */
181 static inline void __managed_dentry_set_automount(struct dentry *dentry)
183 dentry->d_flags |= DCACHE_NEED_AUTOMOUNT;
186 static inline void managed_dentry_set_automount(struct dentry *dentry)
188 spin_lock(&dentry->d_lock);
189 __managed_dentry_set_automount(dentry);
190 spin_unlock(&dentry->d_lock);
193 static inline void __managed_dentry_clear_automount(struct dentry *dentry)
195 dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
198 static inline void managed_dentry_clear_automount(struct dentry *dentry)
200 spin_lock(&dentry->d_lock);
201 __managed_dentry_clear_automount(dentry);
202 spin_unlock(&dentry->d_lock);
205 static inline void __managed_dentry_set_transit(struct dentry *dentry)
207 dentry->d_flags |= DCACHE_MANAGE_TRANSIT;
210 static inline void managed_dentry_set_transit(struct dentry *dentry)
212 spin_lock(&dentry->d_lock);
213 __managed_dentry_set_transit(dentry);
214 spin_unlock(&dentry->d_lock);
217 static inline void __managed_dentry_clear_transit(struct dentry *dentry)
219 dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
222 static inline void managed_dentry_clear_transit(struct dentry *dentry)
224 spin_lock(&dentry->d_lock);
225 __managed_dentry_clear_transit(dentry);
226 spin_unlock(&dentry->d_lock);
229 static inline void __managed_dentry_set_managed(struct dentry *dentry)
231 dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
234 static inline void managed_dentry_set_managed(struct dentry *dentry)
236 spin_lock(&dentry->d_lock);
237 __managed_dentry_set_managed(dentry);
238 spin_unlock(&dentry->d_lock);
241 static inline void __managed_dentry_clear_managed(struct dentry *dentry)
243 dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
246 static inline void managed_dentry_clear_managed(struct dentry *dentry)
248 spin_lock(&dentry->d_lock);
249 __managed_dentry_clear_managed(dentry);
250 spin_unlock(&dentry->d_lock);
253 /* Initializing function */
255 int autofs4_fill_super(struct super_block *, void *, int);
256 struct autofs_info *autofs4_new_ino(struct autofs_sb_info *);
257 void autofs4_clean_ino(struct autofs_info *);
259 static inline int autofs_prepare_pipe(struct file *pipe)
261 if (!pipe->f_op->write)
263 if (!S_ISFIFO(file_inode(pipe)->i_mode))
265 /* We want a packet pipe */
266 pipe->f_flags |= O_DIRECT;
270 /* Queue management functions */
272 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
273 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
274 void autofs4_catatonic_mode(struct autofs_sb_info *);
276 static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
278 return new_encode_dev(sbi->sb->s_dev);
281 static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
283 return sbi->sb->s_root->d_inode->i_ino;
286 static inline int simple_positive(struct dentry *dentry)
288 return dentry->d_inode && !d_unhashed(dentry);
291 static inline void __autofs4_add_expiring(struct dentry *dentry)
293 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
294 struct autofs_info *ino = autofs4_dentry_ino(dentry);
296 if (list_empty(&ino->expiring))
297 list_add(&ino->expiring, &sbi->expiring_list);
302 static inline void autofs4_add_expiring(struct dentry *dentry)
304 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
305 struct autofs_info *ino = autofs4_dentry_ino(dentry);
307 spin_lock(&sbi->lookup_lock);
308 if (list_empty(&ino->expiring))
309 list_add(&ino->expiring, &sbi->expiring_list);
310 spin_unlock(&sbi->lookup_lock);
315 static inline void autofs4_del_expiring(struct dentry *dentry)
317 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
318 struct autofs_info *ino = autofs4_dentry_ino(dentry);
320 spin_lock(&sbi->lookup_lock);
321 if (!list_empty(&ino->expiring))
322 list_del_init(&ino->expiring);
323 spin_unlock(&sbi->lookup_lock);
328 extern void autofs4_kill_sb(struct super_block *);