#include?
#include?
#include?
#include?
#include?	
#include?		
#include?		
#include?	
#include?	
#include?	
#include?	
#include?
#include?
#include?
#include?
#include?	
#include?
#include?“sbull.h“

static?int?sbull_major?=?SBULL_MAJOR;	//主設備號?0
static?int?nsectors?=?16384;		//設備大小
static?int?hardsect_size?=?512;		//扇區大小

module_param（sbull_majorint0）;
module_param（nsectorsint0）;
module_param（hardsect_sizeint0）;

struct?sbull_dev
{
	int	size;			//以扇區為單位設備的大小
	u8	*data;			//數據數組（存儲磁盤數據隊列）
	struct?request_queue?*queue;	//請求隊列（用于互斥）
	struct?gendisk?*gd;		//gendisk結構
	spinlock_t?lock;		//設備自旋鎖
};

static?struct?sbull_dev?*Devices?=?NULL;

static?int?sbull_open（struct?inode?*inodestruct?file?*filp）
{
	return?0;
}

static?int?sbull_release（struct?inode?*inodestruct?file?*filp）
{
	return?0;
}

static?int?sbull_ioctl（struct?inode?*inodestruct?file?*filpunsigned?int?cmdunsigned?long?arg）
{
	int?ret?=?0;
	int?err?=?0;
	//檢測命令的有效性
	if（_IOC_TYPE（cmd）?!=?SBULL_IOC_MAGIC）
	{
		return?-EINVAL;
	}
	if（_IOC_NR（cmd）?>?SBULL_IOC_MAXNR）
	{
		return?-EINVAL;
	}
	//根據命令類型，檢測用戶空間是否可以訪問
	if（_IOC_DIR（cmd）?&?_IOC_READ）
	{
		err?=?!access_ok（VERIFY_WRITE（void*）arg_IOC_SIZE（cmd））;
	}
	else?if（_IOC_DIR（cmd）?&?_IOC_WRITE）
	{
		err?=?!access_ok（VERIFY_READ（void*）arg_IOC_SIZE（cmd））;
	}
	if（err）
	{
		return?-EFAULT;
	}
	switch（cmd）
	{
		case?SBULL_IOCGETMAJOR:		//得到主設備號
			ret?=?__put_user（sbull_major（int?__user*）arg）;
			break;
		case?SBULL_IOCGETSECTORS:	//得到扇區總數
			ret?=?__put_user（nsectors（int?__user*）arg）;
			break;
		case?SBULL_IOCGETSIZE:		//得到塊設備大小
			ret?=?__put_user（nsectors?*?hardsect_size（int?__user*）arg）;
			break;
		default:
			return?-EFAULT;
	}
	return?ret;
}

static?void?sbull_transfer（struct?sbull_dev?*devsector_t?sectorunsigned?long?nsectchar?*bufferint?write）
{
	unsigned?long?offset?=?sector?<	unsigned?long?nbytes?=?nsect?<	if（?（offset?+?nbytes）?>?dev->size?）
	{
		printk（KERN_NOTICE?“Beyond-end?write?（%ld?%ld）\n“offsetnbytes）;
		return;
	}
	if（write）
	{	
		printk（KERN_NOTICE?“writing?to?disk\n“）;
		memcpy（dev->data?+?offsetbuffernbytes）;
	}
	else
	{
		printk（KERN_NOTICE?“readding?from?disk\n“）;
		memcpy（bufferdev->data?+?offsetnbytes）;
	}
	
}

static?void?sbull_request（struct?request_queue?*q）
{
	struct?request?*req;
	req?=?blk_fetch_request（q）;
	while（?req?!=?NULL?）
	{
		struct?sbull_dev?*dev?=?req->rq_disk->private_data;
		if（!blk_fs_request（req））
		{
			printk（KERN_NOTICE?“Skip?non-fs?request\n“）;
			__blk_end_request_all（req0）;
			continue;
		}
		sbull_transfer（devblk_rq_pos（req）blk_rq_cur_sectors（req）req->bufferrq_data_dir（req））;
		if（?!__blk_end_request_cur（req0））
		{
			req?=?blk_fetch_request（q）;
		}
	}
}

static?struct?block_device_operations?sb

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件?????235520??2011-12-25?20:32??操作系統.doc

?????文件????????267??2011-12-11?10:10??sbull\sbull\.sbull.ko.cmd

?????文件??????24214??2011-12-11?10:10??sbull\sbull\.sbull.mod.o.cmd

?????文件??????33966??2011-12-11?10:10??sbull\sbull\.sbull.o.cmd

?????文件?????????77??2011-12-11?10:16??sbull\sbull\.tmp_versions\sbull.mod

?????文件????????235??2011-12-06?10:53??sbull\sbull\Makefile

?????文件??????????0??2011-12-10?20:23??sbull\sbull\Module.symvers

?????文件?????????46??2011-12-11?10:16??sbull\sbull\modules.order

?????文件???????5332??2011-12-11?10:48??sbull\sbull\sbull.c

?????文件????????411??2011-12-10?20:41??sbull\sbull\sbull.h

?????文件???????8715??2011-12-11?10:10??sbull\sbull\sbull.ko

?????文件???????1451??2011-12-11?10:10??sbull\sbull\sbull.mod.c

?????文件???????3268??2011-12-11?10:10??sbull\sbull\sbull.mod.o

?????文件???????6084??2011-12-11?10:10??sbull\sbull\sbull.o

?????文件????????411??2011-12-10?20:56??sbull\test\sbull.h

?????文件???????7302??2011-12-11?10:15??sbull\test\test

?????文件???????1072??2011-12-11?09:53??sbull\test\test.c

????..AD...?????????0??2014-08-30?14:11??sbull\sbull\.tmp_versions

????..AD...?????????0??2014-08-30?14:11??sbull\sbull

????..AD...?????????0??2014-08-30?14:11??sbull\test

????..AD...?????????0??2014-08-30?14:11??sbull

-----------?---------??----------?-----??----

???????????????328371????????????????????21