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#ifndef _BLK_H

#define _BLK_H

#include <linux/blkdev.h>

#include <linux/locks.h>

#include <linux/config.h>

/*

 * NR_REQUEST is the number of entries in the request-queue.

 * NOTE that writes may use only the low 2/3 of these: reads

 * take precedence.

 */

#define NR_REQUEST      64

/*

 * This is used in the elevator algorithm.  We don't prioritise reads

 * over writes any more --- although reads are more time-critical than

 * writes, by treating them equally we increase filesystem throughput.

 * This turns out to give better overall performance.  -- sct

 */

#define IN_ORDER(s1,s2) \

((s1)->rq_dev < (s2)->rq_dev || (((s1)->rq_dev == (s2)->rq_dev && \

(s1)->sector < (s2)->sector)))

/*

 * These will have to be changed to be aware of different buffer

 * sizes etc.. It actually needs a major cleanup.

 */

#if defined(IDE_DRIVER) || defined(MD_DRIVER)

#define SECTOR_MASK ((BLOCK_SIZE >> 9) - 1)

#else

#define SECTOR_MASK (blksize_size[MAJOR_NR] &&     \

        blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] ? \

        ((blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] >> 9) - 1) :  \

        ((BLOCK_SIZE >> 9)  -  1))

#endif /* IDE_DRIVER */

#define SUBSECTOR(block) (CURRENT->current_nr_sectors > 0)

#ifdef CONFIG_CDU31A

extern int cdu31a_init(void);

#endif CONFIG_CDU31A

#ifdef CONFIG_MCD

extern int mcd_init(void);

#endif CONFIG_MCD

#ifdef CONFIG_MCDX

extern int mcdx_init(void);

#endif CONFIG_MCDX

#ifdef CONFIG_SBPCD

extern int sbpcd_init(void);

#endif CONFIG_SBPCD

#ifdef CONFIG_AZTCD

extern int aztcd_init(void);

#endif CONFIG_AZTCD

#ifdef CONFIG_CDU535

extern int sony535_init(void);

#endif CONFIG_CDU535

#ifdef CONFIG_GSCD

extern int gscd_init(void);

#endif CONFIG_GSCD

#ifdef CONFIG_CM206

extern int cm206_init(void);

#endif CONFIG_CM206

#ifdef CONFIG_OPTCD

extern int optcd_init(void);

#endif CONFIG_OPTCD

#ifdef CONFIG_SJCD

extern int sjcd_init(void);

#endif CONFIG_SJCD

#ifdef CONFIG_BLK_DEV_HD

extern int hd_init(void);

#endif

#ifdef CONFIG_BLK_DEV_IDE

extern int ide_init(void);

#endif

#ifdef CONFIG_BLK_DEV_XD

extern int xd_init(void);

#endif

#ifdef CONFIG_BLK_DEV_LOOP

extern int loop_init(void);

#endif

#ifdef CONFIG_BLK_DEV_MD

extern int md_init(void);

#endif CONFIG_BLK_DEV_MD

extern void set_device_ro(kdev_t dev,int flag);

void add_blkdev_randomness(int major);

extern int floppy_init(void);

extern void rd_load(void);

extern int rd_init(void);

extern int rd_doload;           /* 1 = load ramdisk, 0 = don't load */

extern int rd_prompt;           /* 1 = prompt for ramdisk, 0 = don't prompt */

extern int rd_image_start;      /* starting block # of image */

#ifdef CONFIG_BLK_DEV_INITRD

#define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */

extern unsigned long initrd_start,initrd_end;

extern int mount_initrd; /* zero if initrd should not be mounted */

void initrd_init(void);

#endif

#define RO_IOCTLS(dev,where) \

  case BLKROSET: { int __err;  if (!suser()) return -EACCES; \

                   __err = verify_area(VERIFY_READ, (void *) (where), sizeof(long)); \

                   if (!__err) set_device_ro((dev),get_fs_long((long *) (where))); return __err; } \

  case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \

                   if (!__err) put_fs_long(0!=is_read_only(dev),(long *) (where)); return __err; }

#if defined(MAJOR_NR) || defined(IDE_DRIVER)

/*

 * Add entries as needed.

 */

#ifdef IDE_DRIVER

#define DEVICE_NR(device)       (MINOR(device) >> PARTN_BITS)

#define DEVICE_ON(device)       /* nothing */

#define DEVICE_OFF(device)      /* nothing */

#elif (MAJOR_NR == RAMDISK_MAJOR)

/* ram disk */

#define DEVICE_NAME "ramdisk"

#define DEVICE_REQUEST rd_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device) 

#define DEVICE_OFF(device)

#define DEVICE_NO_RANDOM

#elif (MAJOR_NR == FLOPPY_MAJOR)

static void floppy_off(unsigned int nr);

#define DEVICE_NAME "floppy"

#define DEVICE_INTR do_floppy

#define DEVICE_REQUEST do_fd_request

#define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))

#define DEVICE_ON(device)

#define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))

#elif (MAJOR_NR == HD_MAJOR)

/* harddisk: timeout is 6 seconds.. */

#define DEVICE_NAME "harddisk"

#define DEVICE_INTR do_hd

#define DEVICE_TIMEOUT HD_TIMER

#define TIMEOUT_VALUE (6*HZ)

#define DEVICE_REQUEST do_hd_request

#define DEVICE_NR(device) (MINOR(device)>>6)

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == SCSI_DISK_MAJOR)

#define DEVICE_NAME "scsidisk"

#define DEVICE_INTR do_sd  

#define TIMEOUT_VALUE (2*HZ)

#define DEVICE_REQUEST do_sd_request

#define DEVICE_NR(device) (MINOR(device) >> 4)

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

/* Kludge to use the same number for both char and block major numbers */

#elif  (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)

#define DEVICE_NAME "Multiple devices driver"

#define DEVICE_REQUEST do_md_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == SCSI_TAPE_MAJOR)

#define DEVICE_NAME "scsitape"

#define DEVICE_INTR do_st  

#define DEVICE_NR(device) (MINOR(device) & 0x7f)

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == SCSI_CDROM_MAJOR)

#define DEVICE_NAME "CD-ROM"

#define DEVICE_INTR do_sr

#define DEVICE_REQUEST do_sr_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == XT_DISK_MAJOR)

#define DEVICE_NAME "xt disk"

#define DEVICE_REQUEST do_xd_request

#define DEVICE_NR(device) (MINOR(device) >> 6)

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif defined(MFM_DISK_MAJOR) && (MAJOR_NR == MFM_DISK_MAJOR)

#define DEVICE_NAME "mfm disk"

#define DEVICE_INTR do_mfm

#define DEVICE_REQUEST do_mfm_request

#define DEVICE_NR(device) (MINOR(device) >> 6)

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == CDU31A_CDROM_MAJOR)

#define DEVICE_NAME "CDU31A"

#define DEVICE_REQUEST do_cdu31a_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)

#define DEVICE_NAME "Mitsumi CD-ROM"

/* #define DEVICE_INTR do_mcd */

#define DEVICE_REQUEST do_mcd_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)

#define DEVICE_NAME "Mitsumi CD-ROM"

/* #define DEVICE_INTR do_mcdx */

#define DEVICE_REQUEST do_mcdx_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)

#define DEVICE_NAME "Matsushita CD-ROM controller #1"

#define DEVICE_REQUEST do_sbpcd_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)

#define DEVICE_NAME "Matsushita CD-ROM controller #2"

#define DEVICE_REQUEST do_sbpcd2_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)

#define DEVICE_NAME "Matsushita CD-ROM controller #3"

#define DEVICE_REQUEST do_sbpcd3_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)

#define DEVICE_NAME "Matsushita CD-ROM controller #4"

#define DEVICE_REQUEST do_sbpcd4_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == AZTECH_CDROM_MAJOR)

#define DEVICE_NAME "Aztech CD-ROM"

#define DEVICE_REQUEST do_aztcd_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == CDU535_CDROM_MAJOR)

#define DEVICE_NAME "SONY-CDU535"

#define DEVICE_INTR do_cdu535

#define DEVICE_REQUEST do_cdu535_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)

#define DEVICE_NAME "Goldstar R420"

#define DEVICE_REQUEST do_gscd_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == CM206_CDROM_MAJOR)

#define DEVICE_NAME "Philips/LMS cd-rom cm206"

#define DEVICE_REQUEST do_cm206_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == OPTICS_CDROM_MAJOR)

#define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"

#define DEVICE_REQUEST do_optcd_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#elif (MAJOR_NR == SANYO_CDROM_MAJOR)

#define DEVICE_NAME "Sanyo H94A CD-ROM"

#define DEVICE_REQUEST do_sjcd_request

#define DEVICE_NR(device) (MINOR(device))

#define DEVICE_ON(device)

#define DEVICE_OFF(device)

#endif /* MAJOR_NR == whatever */

#if (MAJOR_NR != SCSI_TAPE_MAJOR)

#if !defined(IDE_DRIVER)

#ifndef CURRENT

#define CURRENT (blk_dev[MAJOR_NR].current_request)

#endif

#define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)

#ifdef DEVICE_INTR

static void (*DEVICE_INTR)(void) = NULL;

#endif

#ifdef DEVICE_TIMEOUT

#define SET_TIMER \

((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \

(timer_active |= 1<<DEVICE_TIMEOUT))

#define CLEAR_TIMER \

timer_active &= ~(1<<DEVICE_TIMEOUT)

#define SET_INTR(x) \

if ((DEVICE_INTR = (x)) != NULL) \

        SET_TIMER; \

else \

        CLEAR_TIMER;

#else

#define SET_INTR(x) (DEVICE_INTR = (x))

#endif /* DEVICE_TIMEOUT */

static void (DEVICE_REQUEST)(void);

#ifdef DEVICE_INTR

#define CLEAR_INTR SET_INTR(NULL)

#else

#define CLEAR_INTR

#endif

#define INIT_REQUEST \

        if (!CURRENT) {\

                CLEAR_INTR; \

                return; \

        } \

        if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \

                panic(DEVICE_NAME ": request list destroyed"); \

        if (CURRENT->bh) { \

                if (!buffer_locked(CURRENT->bh)) \

                        panic(DEVICE_NAME ": block not locked"); \

        }

#endif /* !defined(IDE_DRIVER) */

/* end_request() - SCSI devices have their own version */

/*               - IDE drivers have their own copy too */

#if ! SCSI_BLK_MAJOR(MAJOR_NR)

#if defined(IDE_DRIVER) && !defined(_IDE_C) /* shared copy for IDE modules */

void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);

#else

#ifdef IDE_DRIVER

void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) {

        struct request *req = hwgroup->rq;

#else

static void end_request(int uptodate) {

        struct request *req = CURRENT;

#endif /* IDE_DRIVER */

        struct buffer_head * bh;

        req->errors = 0;

        if (!uptodate) {

                printk("end_request: I/O error, dev %s, sector %lu\n",

                        kdevname(req->rq_dev), req->sector);

                req->nr_sectors--;

                req->nr_sectors &= ~SECTOR_MASK;

                req->sector += (BLOCK_SIZE / 512);

                req->sector &= ~SECTOR_MASK;

        }

        if ((bh = req->bh) != NULL) {

                req->bh = bh->b_reqnext;

                bh->b_reqnext = NULL;

                mark_buffer_uptodate(bh, uptodate);

                unlock_buffer(bh);

                if ((bh = req->bh) != NULL) {

                        req->current_nr_sectors = bh->b_size >> 9;

                        if (req->nr_sectors < req->current_nr_sectors) {

                                req->nr_sectors = req->current_nr_sectors;

                                printk("end_request: buffer-list destroyed\n");

                        }

                        req->buffer = bh->b_data;

                        return;

                }

        }

#ifndef DEVICE_NO_RANDOM

        add_blkdev_randomness(MAJOR(req->rq_dev));

#endif

#ifdef IDE_DRIVER

        blk_dev[MAJOR(req->rq_dev)].current_request = req->next;

        hwgroup->rq = NULL;

#else

        DEVICE_OFF(req->rq_dev);

        CURRENT = req->next;

#endif /* IDE_DRIVER */

        if (req->sem != NULL)

                up(req->sem);

        req->rq_status = RQ_INACTIVE;

        wake_up(&wait_for_request);

}

#endif /* defined(IDE_DRIVER) && !defined(_IDE_C) */

#endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */

#endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */

#endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */

#endif /* _BLK_H */