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/mutex.h>
18 #include <linux/list.h>
20 /* This is the range of ioctl() numbers we claim as ours */
21 #define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
22 #define AUTOFS_IOC_COUNT 32
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/string.h>
28 #include <linux/wait.h>
29 #include <linux/sched.h>
30 #include <linux/mount.h>
31 #include <linux/namei.h>
32 #include <asm/current.h>
33 #include <asm/uaccess.h>
38 #define DPRINTK(fmt,args...) do { printk(KERN_DEBUG "pid %d: %s: " fmt "\n" , current->pid , __FUNCTION__ , ##args); } while(0)
40 #define DPRINTK(fmt,args...) do {} while(0)
43 #define AUTOFS_SUPER_MAGIC 0x0187
45 /* Unified info structure. This is pointed to by both the dentry and
46 inode structures. Each file in the filesystem has an instance of this
47 structure. It holds a reference to the dentry, so dentries are never
48 flushed while the file exists. All name lookups are dealt with at the
49 dentry level, although the filesystem can interfere in the validation
50 process. Readdir is implemented by traversing the dentry lists. */
52 struct dentry *dentry;
57 struct autofs_sb_info *sbi;
58 unsigned long last_used;
64 void (*free)(struct autofs_info *);
70 #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
72 struct autofs_wait_queue {
73 wait_queue_head_t queue;
74 struct autofs_wait_queue *next;
75 autofs_wqt_t wait_queue_token;
76 /* We use the following to see what we are waiting for */
86 /* This is for status reporting upon return */
91 #define AUTOFS_SBI_MAGIC 0x6d4a556d
93 #define AUTOFS_TYPE_INDIRECT 0x0001
94 #define AUTOFS_TYPE_DIRECT 0x0002
95 #define AUTOFS_TYPE_OFFSET 0x0004
97 struct autofs_sb_info {
108 unsigned long exp_timeout;
112 struct super_block *sb;
113 struct mutex wq_mutex;
115 struct autofs_wait_queue *queues; /* Wait queue pointer */
118 static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
120 return (struct autofs_sb_info *)(sb->s_fs_info);
123 static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
125 return (struct autofs_info *)(dentry->d_fsdata);
128 /* autofs4_oz_mode(): do we see the man behind the curtain? (The
129 processes which do manipulations for us in user space sees the raw
130 filesystem without "magic".) */
132 static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
133 return sbi->catatonic || process_group(current) == sbi->oz_pgrp;
136 /* Does a dentry have some pending activity? */
137 static inline int autofs4_ispending(struct dentry *dentry)
139 struct autofs_info *inf = autofs4_dentry_ino(dentry);
142 if (dentry->d_flags & DCACHE_AUTOFS_PENDING)
146 spin_lock(&inf->sbi->fs_lock);
147 pending = inf->flags & AUTOFS_INF_EXPIRING;
148 spin_unlock(&inf->sbi->fs_lock);
154 static inline void autofs4_copy_atime(struct file *src, struct file *dst)
156 dst->f_dentry->d_inode->i_atime = src->f_dentry->d_inode->i_atime;
160 struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *);
161 void autofs4_free_ino(struct autofs_info *);
164 int is_autofs4_dentry(struct dentry *);
165 int autofs4_expire_run(struct super_block *, struct vfsmount *,
166 struct autofs_sb_info *,
167 struct autofs_packet_expire __user *);
168 int autofs4_expire_multi(struct super_block *, struct vfsmount *,
169 struct autofs_sb_info *, int __user *);
171 /* Operations structures */
173 extern struct inode_operations autofs4_symlink_inode_operations;
174 extern struct inode_operations autofs4_dir_inode_operations;
175 extern struct inode_operations autofs4_root_inode_operations;
176 extern struct inode_operations autofs4_indirect_root_inode_operations;
177 extern struct inode_operations autofs4_direct_root_inode_operations;
178 extern const struct file_operations autofs4_dir_operations;
179 extern const struct file_operations autofs4_root_operations;
181 /* Initializing function */
183 int autofs4_fill_super(struct super_block *, void *, int);
184 struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode);
186 /* Queue management functions */
188 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
189 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
190 void autofs4_catatonic_mode(struct autofs_sb_info *);
192 static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **dentry)
196 while (d_mountpoint(*dentry)) {
197 int followed = follow_down(mnt, dentry);
205 static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
207 return new_encode_dev(sbi->sb->s_dev);
210 static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
212 return sbi->sb->s_root->d_inode->i_ino;
215 static inline int simple_positive(struct dentry *dentry)
217 return dentry->d_inode && !d_unhashed(dentry);
220 static inline int __simple_empty(struct dentry *dentry)
222 struct dentry *child;
225 list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child)
226 if (simple_positive(child))
233 void autofs4_dentry_release(struct dentry *);