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/* -*- linux-c -*- ------------------------------------------------------- *

 *

 * linux/fs/autofs/autofs_i.h

 *

 *   Copyright 1997-1998 Transmeta Corporation - All Rights Reserved

 *

 * This file is part of the Linux kernel and is made available under

 * the terms of the GNU General Public License, version 2, or at your

 * option, any later version, incorporated herein by reference.

 *

 * ----------------------------------------------------------------------- */

/* Internal header file for autofs */

#include <linux/auto_fs.h>

/* This is the range of ioctl() numbers we claim as ours */

#define AUTOFS_IOC_FIRST     AUTOFS_IOC_READY

#define AUTOFS_IOC_COUNT     32

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/sched.h>

#include <linux/string.h>

#include <linux/wait.h>

#include <asm/uaccess.h>

#ifdef DEBUG

#define DPRINTK(D) (printk D)

#else

#define DPRINTK(D) ((void)0)

#endif

#define AUTOFS_SUPER_MAGIC 0x0187

/*

 * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the

 * kernel will keep the negative response cached for up to the time given

 * here, although the time can be shorter if the kernel throws the dcache

 * entry away.  This probably should be settable from user space.

 */

#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */

/* Structures associated with the root directory hash table */

#define AUTOFS_HASH_SIZE 67

struct autofs_dir_ent {

        int hash;

        char *name;

        int len;

        ino_t ino;

        struct dentry *dentry;

        /* Linked list of entries */

        struct autofs_dir_ent *next;

        struct autofs_dir_ent **back;

        /* The following entries are for the expiry system */

        unsigned long last_usage;

        struct list_head exp;

};

struct autofs_dirhash {

        struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];

        struct list_head expiry_head;

};

struct autofs_wait_queue {

        wait_queue_head_t queue;

        struct autofs_wait_queue *next;

        autofs_wqt_t wait_queue_token;

        /* We use the following to see what we are waiting for */

        int hash;

        int len;

        char *name;

        /* This is for status reporting upon return */

        int status;

        int wait_ctr;

};

struct autofs_symlink {

        char *data;

        int len;

        time_t mtime;

};

#define AUTOFS_MAX_SYMLINKS 256

#define AUTOFS_ROOT_INO      1

#define AUTOFS_FIRST_SYMLINK 2

#define AUTOFS_FIRST_DIR_INO (AUTOFS_FIRST_SYMLINK+AUTOFS_MAX_SYMLINKS)

#define AUTOFS_SYMLINK_BITMAP_LEN \

        ((AUTOFS_MAX_SYMLINKS+((sizeof(long)*1)-1))/(sizeof(long)*8))

#define AUTOFS_SBI_MAGIC 0x6d4a556d

struct autofs_sb_info {

        u32 magic;

        struct file *pipe;

        pid_t oz_pgrp;

        int catatonic;

        unsigned long exp_timeout;

        ino_t next_dir_ino;

        struct autofs_wait_queue *queues; /* Wait queue pointer */

        struct autofs_dirhash dirhash; /* Root directory hash */

        struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS];

        unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];

};

static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)

{

        return (struct autofs_sb_info *)(sb->u.generic_sbp);

}

/* autofs_oz_mode(): do we see the man behind the curtain?  (The

   processes which do manipulations for us in user space sees the raw

   filesystem without "magic".) */

static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {

        return sbi->catatonic || current->pgrp == sbi->oz_pgrp;

}

/* Hash operations */

void autofs_initialize_hash(struct autofs_dirhash *);

struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *);

void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *);

void autofs_hash_delete(struct autofs_dir_ent *);

struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *);

void autofs_hash_dputall(struct autofs_dirhash *);

void autofs_hash_nuke(struct autofs_dirhash *);

/* Expiration-handling functions */

void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *);

struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt);

/* Operations structures */

extern struct inode_operations autofs_root_inode_operations;

extern struct inode_operations autofs_symlink_inode_operations;

extern struct inode_operations autofs_dir_inode_operations;

extern struct file_operations autofs_root_operations;

/* Initializing function */

struct super_block *autofs_read_super(struct super_block *, void *,int);

/* Queue management functions */

int autofs_wait(struct autofs_sb_info *,struct qstr *);

int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);

void autofs_catatonic_mode(struct autofs_sb_info *);

#ifdef DEBUG

void autofs_say(const char *name, int len);

#else

#define autofs_say(n,l) ((void)0)

#endif