/****************************************Copyright (c)****************************************************                               Guangzou ZLG-MCU Development Co.,LTD.**                                     graduate school**                                 http://www.zlgmcu.com****--------------File Info-------------------------------------------------------------------------------** File name:			zlg_fs.c** Last modified Date:  2005-05-25** Last Version:		1.0** Descriptions:		This is a Kernel module for uClinux 2.4.x .**                      This module let uClinux 2.4.x can use ZLG/FS . **------------------------------------------------------------------------------------------------------** Created by:			Chenmingji** Created date:		2005-05-25** Version:				1.0** Descriptions:		The original version****------------------------------------------------------------------------------------------------------** Modified by:			Chenmingji** Modified date:		2005-05-25** Version:				1.01** Descriptions:		Modified zlg_fs_cleanup()**********************************************************************************************************/#define IN_ZLG_FS#include "config.h"/********************************************************************************************************              function announce********************************************************************************************************/static int zlg_fs_open(struct inode *inode, struct file *filp);static int zlg_fs_release(struct inode *inode, struct file *filp); static int zlg_fs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,		    unsigned long param);static int check_zlg_fs_change(kdev_t dev);static int zlg_fs_revalidate(kdev_t dev);int  zlg_fs_init(void);void zlg_fs_cleanup(void);/********************************************************************************************************              function announce********************************************************************************************************/#define MAJOR_NR major                      /* force definitions on in blk.h    */#define DEVICE_NO_RANDOM                    /* no entropy to contribute         */#define DEVICE_OFF(d)                       /* do-nothing */MODULE_PARM(major, "i");module_init(zlg_fs_init);module_exit(zlg_fs_cleanup);#define DEVICE_NR(device) (MINOR(device) >> ZLG_FS_SHIFT)MODULE_LICENSE("Proprietary");MODULE_DESCRIPTION("Guangzou ZLG-MCU Development Co.,LTD.\ngraduate school\nhttp://www.zlgmcu.com");MODULE_SUPPORTED_DEVICE("uClinux2.4.x LPC2200 ZLG/FS");MODULE_AUTHOR("chenmingji");/***********************************************************************************************************                  "全局和靜態變量在這里定義"         **        global variables and static variables define here********************************************************************************************************/static int major = ZLG_FS_MAJOR_NR;             /* must be declared before including blk.h */#include <linux/blk.h>static int ZLG_FS_blocksizes[MAX_DISKS << ZLG_FS_SHIFT]; /* bytes per device         */static int ZLG_FS_sizes[MAX_DISKS << ZLG_FS_SHIFT];      /* bytes per device's block */                                                                /* must be (1 << n)         */static unsigned int ZLG_FS_usage[MAX_DISKS];                   /* device using count */fs_drivers *DiskInfo[MAX_DISKS];static struct hd_struct part[MAX_DISKS << ZLG_FS_SHIFT];struct gendisk zlg_fs_gendisk;/********************************************************************************************************/static struct block_device_operations zlg_fs_fops =        /* driver info  */{    owner:              THIS_MODULE,    open:               zlg_fs_open,    release:            zlg_fs_release,    ioctl:              zlg_fs_ioctl,    check_media_change: check_zlg_fs_change,    revalidate:         zlg_fs_revalidate,};/*********************************************************************************************************** Function name: zlg_fs_add_driver** Descriptions: add driver.** Input:info:   driver info** Output 0:     OK**        other: not OK** Created by:   Chenmingji** Created Date: 2005-05-25**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/        int zlg_fs_add_driver(fs_drivers *info){    int i;        for (i = 0; i < MAX_DISKS; i++)    {        if (DiskInfo[i] == NULL)        {            DiskInfo[i] = info;            return 0;        }    }    return -1;    }/*********************************************************************************************************** Function name: zlg_fs_remove_driver** Descriptions: replace  __make_request() in this module.** Descriptions: remove driver** Input:info:   driver info** Output 0:     OK**        other: not OK** Created by:   Chenmingji** Created Date: 2005-05-25**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/        int zlg_fs_remove_driver(fs_drivers *info){    int i;        for (i = 0; i < MAX_DISKS; i++)    {        if (DiskInfo[i] == info)        {            DiskInfo[i] = NULL;            return 0;        }    }    return -1;}/*********************************************************************************************************** Function name: zlg_fs_make_request** Descriptions: replace  __make_request() in this module.** Input:queue:  request queue**       rw：    command(read or write)**       bh:     information of block** Output 0:     OK**        other: not OK** Created by:   Chenmingji** Created Date: 2005-05-25**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/        static int zlg_fs_make_request(request_queue_t *queue, int rw, struct buffer_head *bh){    u32 temp, SecSize;    u32 size;    int part, num, nr;    Disk_RW_Parameter dp;    fs_drivers *fs;    num = DEVICE_NR(bh->b_rdev);    nr = MINOR(bh->b_rdev);    if (num >= MAX_DISKS)     {        static int count = 0;        if (count++ < 5)        {            printk(KERN_WARNING DEVICE_NAME ": request past end of device\n");        }        bh->b_end_io(bh, 0);        return 0;    }    fs = DiskInfo[num];    /* Figure out what we are doing */    dp.RsvdForLow = fs->RsvdForLow;    SecSize = fs->BytesPerSec;    dp.SectorIndex = bh->b_rsector + zlg_fs_gendisk.part[nr].start_sect;    dp.Buf = bh->b_data;    size = bh->b_size;    if (bh->b_rsector + size / SecSize >= zlg_fs_gendisk.part[nr].nr_sects)    {        bh->b_end_io(bh, 0);        return 0;    }    /* Do the transfer */    switch(rw)    {        case READ:        case READA:  /* Readahead */            while (size >= SecSize)            {                DiskInfo[num]->DiakCommand(DISK_READ_SECTOR, &dp);                size = size - SecSize;                dp.SectorIndex++;                dp.Buf += SecSize;            }            bh->b_end_io(bh, 1);            break;        case WRITE:            refile_buffer(bh);            while (size >= SecSize)            {                DiskInfo[num]->DiakCommand(DISK_WRITE_SECTOR, &dp);                size = size - SecSize;                dp.SectorIndex++;                dp.Buf += SecSize;            }            mark_buffer_uptodate(bh, 1);            bh->b_end_io(bh, 1);            break;        default:            /* can't happen */            bh->b_end_io(bh, 0);            break;    }    /* Nonzero return means we're done */    return 0;    }/*********************************************************************************************************** Function name: zlg_fs_queue** Descriptions: queue device** Input:q:      queue** Output 0:     OK**        other: not OK** Created by:   Chenmingji** Created Date: 2005-05-25**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/#if 0        static int  zlg_fs_queue(request_queue_t *q){    return 0; } #endif/*********************************************************************************************************** Function name: zlg_fs_open** Descriptions: open device** Input:inode:  information of device**       filp:   pointer of file** Output 0:     OK**        other: not OK** Created by:   Chenmingji** Created Date: 2005-05-25**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/        static int  zlg_fs_open(struct inode *inode, struct file *filp){    int num;    unsigned long flag;    Disk_RW_Parameter dp;    num = DEVICE_NR(inode->i_rdev);    if (num >= MAX_DISKS)    {        return -ENODEV;    }    if (DiskInfo[num] == NULL)    {        return -ENODEV;    }    //local_irq_save(flag);    ZLG_FS_usage[num]++;    if (ZLG_FS_usage[num] == 1)    {        dp.RsvdForLow = DiskInfo[num]->RsvdForLow;        DiskInfo[num]->DiakCommand(DISK_INIT, &dp);        if (DiskInfo[num]->open != NULL)        {            DiskInfo[num]->open(inode, filp);        }        zlg_fs_revalidate(inode->i_rdev);    }    //local_irq_restore(flag);        MOD_INC_USE_COUNT;    return 0;          /* success */} /*********************************************************************************************************** Function name: zlg_fs_release** Descriptions: release device** Input:inode:  information of device**       filp:   pointer of file** Output 0:     OK**        other: not OK** Created by:   Chenmingji** Created Date: 2005-05-25**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/        static int  zlg_fs_release(struct inode *inode, struct file *filp) {    int num;    Disk_RW_Parameter dp;    unsigned long flag;    int part1, npart, i;    num = DEVICE_NR(inode->i_rdev);    if (num >= MAX_DISKS)    {        return -ENODEV;