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;
96 #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
97 #define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
99 struct autofs_wait_queue {
100 wait_queue_head_t queue;
101 struct autofs_wait_queue *next;
102 autofs_wqt_t wait_queue_token;
103 /* We use the following to see what we are waiting for */
111 /* This is for status reporting upon return */
113 unsigned int wait_ctr;
116 #define AUTOFS_SBI_MAGIC 0x6d4a556d
118 struct autofs_sb_info {
128 unsigned long exp_timeout;
132 struct super_block *sb;
133 struct mutex wq_mutex;
135 struct autofs_wait_queue *queues; /* Wait queue pointer */
136 spinlock_t lookup_lock;
137 struct list_head active_list;
138 struct list_head expiring_list;
141 static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
143 return (struct autofs_sb_info *)(sb->s_fs_info);
146 static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
148 return (struct autofs_info *)(dentry->d_fsdata);
151 /* autofs4_oz_mode(): do we see the man behind the curtain? (The
152 processes which do manipulations for us in user space sees the raw
153 filesystem without "magic".) */
155 static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
156 return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp;
159 /* Does a dentry have some pending activity? */
160 static inline int autofs4_ispending(struct dentry *dentry)
162 struct autofs_info *inf = autofs4_dentry_ino(dentry);
164 if (inf->flags & AUTOFS_INF_PENDING)
167 if (inf->flags & AUTOFS_INF_EXPIRING)
173 struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *);
174 void autofs4_free_ino(struct autofs_info *);
177 int is_autofs4_dentry(struct dentry *);
178 int autofs4_expire_wait(struct dentry *dentry);
179 int autofs4_expire_run(struct super_block *, struct vfsmount *,
180 struct autofs_sb_info *,
181 struct autofs_packet_expire __user *);
182 int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
183 struct autofs_sb_info *sbi, int when);
184 int autofs4_expire_multi(struct super_block *, struct vfsmount *,
185 struct autofs_sb_info *, int __user *);
186 struct dentry *autofs4_expire_direct(struct super_block *sb,
187 struct vfsmount *mnt,
188 struct autofs_sb_info *sbi, int how);
189 struct dentry *autofs4_expire_indirect(struct super_block *sb,
190 struct vfsmount *mnt,
191 struct autofs_sb_info *sbi, int how);
193 /* Device node initialization */
195 int autofs_dev_ioctl_init(void);
196 void autofs_dev_ioctl_exit(void);
198 /* Operations structures */
200 extern const struct inode_operations autofs4_symlink_inode_operations;
201 extern const struct inode_operations autofs4_dir_inode_operations;
202 extern const struct file_operations autofs4_dir_operations;
203 extern const struct file_operations autofs4_root_operations;
204 extern const struct dentry_operations autofs4_dentry_operations;
206 /* VFS automount flags management functions */
208 static inline void __managed_dentry_set_automount(struct dentry *dentry)
210 dentry->d_flags |= DCACHE_NEED_AUTOMOUNT;
213 static inline void managed_dentry_set_automount(struct dentry *dentry)
215 spin_lock(&dentry->d_lock);
216 __managed_dentry_set_automount(dentry);
217 spin_unlock(&dentry->d_lock);
220 static inline void __managed_dentry_clear_automount(struct dentry *dentry)
222 dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
225 static inline void managed_dentry_clear_automount(struct dentry *dentry)
227 spin_lock(&dentry->d_lock);
228 __managed_dentry_clear_automount(dentry);
229 spin_unlock(&dentry->d_lock);
232 static inline void __managed_dentry_set_transit(struct dentry *dentry)
234 dentry->d_flags |= DCACHE_MANAGE_TRANSIT;
237 static inline void managed_dentry_set_transit(struct dentry *dentry)
239 spin_lock(&dentry->d_lock);
240 __managed_dentry_set_transit(dentry);
241 spin_unlock(&dentry->d_lock);
244 static inline void __managed_dentry_clear_transit(struct dentry *dentry)
246 dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
249 static inline void managed_dentry_clear_transit(struct dentry *dentry)
251 spin_lock(&dentry->d_lock);
252 __managed_dentry_clear_transit(dentry);
253 spin_unlock(&dentry->d_lock);
256 static inline void __managed_dentry_set_managed(struct dentry *dentry)
258 dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
261 static inline void managed_dentry_set_managed(struct dentry *dentry)
263 spin_lock(&dentry->d_lock);
264 __managed_dentry_set_managed(dentry);
265 spin_unlock(&dentry->d_lock);
268 static inline void __managed_dentry_clear_managed(struct dentry *dentry)
270 dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
273 static inline void managed_dentry_clear_managed(struct dentry *dentry)
275 spin_lock(&dentry->d_lock);
276 __managed_dentry_clear_managed(dentry);
277 spin_unlock(&dentry->d_lock);
280 /* Initializing function */
282 int autofs4_fill_super(struct super_block *, void *, int);
283 struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode);
285 /* Queue management functions */
287 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
288 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
289 void autofs4_catatonic_mode(struct autofs_sb_info *);
291 static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
293 return new_encode_dev(sbi->sb->s_dev);
296 static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
298 return sbi->sb->s_root->d_inode->i_ino;
301 static inline int simple_positive(struct dentry *dentry)
303 return dentry->d_inode && !d_unhashed(dentry);
306 static inline void __autofs4_add_expiring(struct dentry *dentry)
308 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
309 struct autofs_info *ino = autofs4_dentry_ino(dentry);
311 if (list_empty(&ino->expiring))
312 list_add(&ino->expiring, &sbi->expiring_list);
317 static inline void autofs4_add_expiring(struct dentry *dentry)
319 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
320 struct autofs_info *ino = autofs4_dentry_ino(dentry);
322 spin_lock(&sbi->lookup_lock);
323 if (list_empty(&ino->expiring))
324 list_add(&ino->expiring, &sbi->expiring_list);
325 spin_unlock(&sbi->lookup_lock);
330 static inline void autofs4_del_expiring(struct dentry *dentry)
332 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
333 struct autofs_info *ino = autofs4_dentry_ino(dentry);
335 spin_lock(&sbi->lookup_lock);
336 if (!list_empty(&ino->expiring))
337 list_del_init(&ino->expiring);
338 spin_unlock(&sbi->lookup_lock);
343 void autofs4_dentry_release(struct dentry *);
344 extern void autofs4_kill_sb(struct super_block *);