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 #define AUTOFS_TYPE_TRIGGER (AUTOFS_TYPE_DIRECT|AUTOFS_TYPE_OFFSET)
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/time.h>
29 #include <linux/string.h>
30 #include <linux/wait.h>
31 #include <linux/sched.h>
32 #include <linux/mount.h>
33 #include <linux/namei.h>
34 #include <asm/current.h>
35 #include <asm/uaccess.h>
40 #define DPRINTK(fmt,args...) do { printk(KERN_DEBUG "pid %d: %s: " fmt "\n" , current->pid , __func__ , ##args); } while(0)
42 #define DPRINTK(fmt,args...) do {} while(0)
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 completion expire_complete;
59 struct list_head active;
60 struct list_head expiring;
62 struct autofs_sb_info *sbi;
63 unsigned long last_used;
72 void (*free)(struct autofs_info *);
78 #define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
79 #define AUTOFS_INF_MOUNTPOINT (1<<1) /* mountpoint status for direct expire */
81 struct autofs_wait_queue {
82 wait_queue_head_t queue;
83 struct autofs_wait_queue *next;
84 autofs_wqt_t wait_queue_token;
85 /* We use the following to see what we are waiting for */
93 /* This is for status reporting upon return */
95 unsigned int wait_ctr;
98 #define AUTOFS_SBI_MAGIC 0x6d4a556d
100 struct autofs_sb_info {
110 unsigned long exp_timeout;
114 struct super_block *sb;
115 struct mutex wq_mutex;
117 struct autofs_wait_queue *queues; /* Wait queue pointer */
118 spinlock_t lookup_lock;
119 struct list_head active_list;
120 struct list_head expiring_list;
123 static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
125 return (struct autofs_sb_info *)(sb->s_fs_info);
128 static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
130 return (struct autofs_info *)(dentry->d_fsdata);
133 /* autofs4_oz_mode(): do we see the man behind the curtain? (The
134 processes which do manipulations for us in user space sees the raw
135 filesystem without "magic".) */
137 static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
138 return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp;
141 /* Does a dentry have some pending activity? */
142 static inline int autofs4_ispending(struct dentry *dentry)
144 struct autofs_info *inf = autofs4_dentry_ino(dentry);
146 if (dentry->d_flags & DCACHE_AUTOFS_PENDING)
149 if (inf->flags & AUTOFS_INF_EXPIRING)
155 static inline void autofs4_copy_atime(struct file *src, struct file *dst)
157 dst->f_path.dentry->d_inode->i_atime =
158 src->f_path.dentry->d_inode->i_atime;
162 struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *);
163 void autofs4_free_ino(struct autofs_info *);
166 int is_autofs4_dentry(struct dentry *);
167 int autofs4_expire_wait(struct dentry *dentry);
168 int autofs4_expire_run(struct super_block *, struct vfsmount *,
169 struct autofs_sb_info *,
170 struct autofs_packet_expire __user *);
171 int autofs4_expire_multi(struct super_block *, struct vfsmount *,
172 struct autofs_sb_info *, int __user *);
174 /* Operations structures */
176 extern const struct inode_operations autofs4_symlink_inode_operations;
177 extern const struct inode_operations autofs4_dir_inode_operations;
178 extern const struct inode_operations autofs4_root_inode_operations;
179 extern const struct inode_operations autofs4_indirect_root_inode_operations;
180 extern const struct inode_operations autofs4_direct_root_inode_operations;
181 extern const struct file_operations autofs4_dir_operations;
182 extern const struct file_operations autofs4_root_operations;
184 /* Initializing function */
186 int autofs4_fill_super(struct super_block *, void *, int);
187 struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode);
189 /* Queue management functions */
191 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
192 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
193 void autofs4_catatonic_mode(struct autofs_sb_info *);
195 static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **dentry)
199 while (d_mountpoint(*dentry)) {
200 int followed = follow_down(mnt, dentry);
208 static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
210 return new_encode_dev(sbi->sb->s_dev);
213 static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
215 return sbi->sb->s_root->d_inode->i_ino;
218 static inline int simple_positive(struct dentry *dentry)
220 return dentry->d_inode && !d_unhashed(dentry);
223 static inline int __simple_empty(struct dentry *dentry)
225 struct dentry *child;
228 list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child)
229 if (simple_positive(child))
236 void autofs4_dentry_release(struct dentry *);
237 extern void autofs4_kill_sb(struct super_block *);