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

 *

 * linux/fs/autofs/autofs_i.h

 *

 *   Copyright 1997 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/malloc.h>

#include <linux/sched.h>

#include <linux/string.h>

#include <linux/wait.h>

#define kver(a,b,c) (((a) << 16) + ((b) << 8) + (c)) 

#if LINUX_VERSION_CODE < kver(2,1,0)

/* Segmentation stuff for pre-2.1 kernels */

#include <asm/segment.h>

static inline int copy_to_user(void *dst, void *src, unsigned long len)

{

        int rv = verify_area(VERIFY_WRITE, dst, len);

        if ( rv )

                return -1;

        memcpy_tofs(dst,src,len);

        return 0;

}

static inline int copy_from_user(void *dst, void *src, unsigned long len)

{

        int rv = verify_area(VERIFY_READ, src, len);

        if ( rv )

                return -1;

        memcpy_fromfs(dst,src,len);

        return 0;

}

#else

/* Segmentation stuff for post-2.1 kernels */

#include <asm/uaccess.h>

#define register_symtab(x)      ((void)0)

#endif

#ifdef DEBUG

#define DPRINTK(D) printk D;

#else

#define DPRINTK(D)

#endif

#define AUTOFS_SUPER_MAGIC 0x0187

/* Structures associated with the root directory hash */

#define AUTOFS_HASH_SIZE 67

typedef u32 autofs_hash_t;      /* Type returned by autofs_hash() */

struct autofs_dir_ent {

        autofs_hash_t hash;

        struct autofs_dir_ent *next;

        struct autofs_dir_ent **back;

        char *name;

        int len;

        ino_t ino;

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

        unsigned long last_usage;

        struct autofs_dir_ent *exp_next;

        struct autofs_dir_ent *exp_prev;

};

struct autofs_dirhash {

        struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];

        struct autofs_dir_ent expiry_head;

};

struct autofs_wait_queue {

        unsigned long wait_queue_token;

        struct wait_queue *queue;

        struct autofs_wait_queue *next;

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

        autofs_hash_t hash;

        int len;

        char *name;

        /* This is for status reporting upon return */

        int status;

        int wait_ctr;

};

struct autofs_symlink {

        int len;

        char *data;

        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+31)/32)

#ifndef END_OF_TIME

#define END_OF_TIME ((time_t)((unsigned long)((time_t)(~0UL)) >> 1))

#endif

#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];

        u32 symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];

};

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

static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {

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

}

/* Debug the mysteriously disappearing wait list */

#ifdef DEBUG_WAITLIST

#define CHECK_WAITLIST(S,O) autofs_check_waitlist_integrity(S,O)

void autofs_check_waitlist_integrity(struct autofs_sb_info *,char *);

#else

#define CHECK_WAITLIST(S,O)

#endif

/* Hash operations */

autofs_hash_t autofs_hash(const char *,int);

void autofs_initialize_hash(struct autofs_dirhash *);

struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,autofs_hash_t,const char *,int);

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 *);

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 autofs_dirhash *,unsigned long);

/* 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;

/* Initializing function */

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

/* Queue management functions */

int autofs_wait(struct autofs_sb_info *,autofs_hash_t,const char *,int);

int autofs_wait_release(struct autofs_sb_info *,unsigned long,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)

#endif