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很悲催, 我自己根据sbull简化的块设备出问题了...搞了几天都没解决.!
在mkfs.ext3 /dev/my_block 的时候...卡在Writing superblocks and filesystem accounting information: /*这里*/
-,- 实在想不通哪出问题了.!.. 以下是代码, 哪个好心的帮我解决一下....
还有就是- - 有没有关于驱动的群... .我自己QQ上加的群都没几个人说话- - 一问问题群就冷清了.!
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/genhd.h>
#include <linux/vmalloc.h>
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/fcntl.h>
#include <linux/sched.h>
MODULE_LICENSE("GPL");
#define MY_BLOCK_SIZE (16*1024*1024)
static int block_major = 0;
module_param(block_major, int , 0);
struct block_dev{
int size;
u8 *data;
spinlock_t lock;
struct request_queue *queue;
struct gendisk *gd;
};
struct block_dev *Devices = NULL;
static void block_transfer(struct block_dev *dev, unsigned long sector,
unsigned long nsect, char *buffer, int write)
{
unsigned long offset = sector << 9;
unsigned long nbytes = nsect << 9;
if ((offset + nbytes) > dev->size)
{
printk(KERN_NOTICE "Beyond-end write (%lu %lu)\n", offset, nbytes);
return;
}
if (write == WRITE)
memcpy(dev->data + offset, buffer , nbytes);
else
memcpy(buffer, dev->data + offset, nbytes);
}
static void block_request(struct request_queue *q)
{
struct request *req;
while((req = blk_fetch_request(q)) != NULL)
{
struct block_dev *dev = req->rq_disk->private_data;
if (!blk_fs_request(req))
{
printk(KERN_ALERT "Blk_fs_request error");
__blk_end_request_all(req, -1);
continue;
}
block_transfer(dev, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req));
__blk_end_request_cur(req, 0);
}
}
static struct block_device_operations block_fops ={
.owner = THIS_MODULE,
};
static int __init block_init(void)
{
block_major = register_blkdev(block_major, "My_block");
if (block_major <= 0){
printk(KERN_ALERT "Register blkdev error:%d", block_major);
return 0;
}
Devices = kmalloc(sizeof(struct block_dev), GFP_KERNEL);
if (Devices == NULL){
printk(KERN_ALERT "Kmalloc error");
unregister_blkdev(block_major, "My_block");
return -ENOMEM;
}
memset(Devices, 0, sizeof(struct block_dev));
Devices -> size = MY_BLOCK_SIZE;
Devices -> data = vmalloc(Devices->size);
if (Devices->data == NULL){
printk(KERN_ALERT"Vmalloc error");
return ENOMEM;;
}
spin_lock_init(&Devices->lock);
Devices->queue = blk_init_queue(block_request, &Devices->lock);
if (Devices->queue == NULL)
{
if (Devices->data)
vfree(Devices->data);
return -ENOMEM;
}
Devices->queue->queuedata = Devices;
blk_queue_logical_block_size(Devices->queue, 512);
Devices->gd = alloc_disk(1);
if (! Devices->gd)
{
if (Devices->data)
vfree(Devices->data);
return -ENOMEM;
}
strcpy(Devices->gd->disk_name, "My_block");
Devices->gd->major = block_major;
Devices->gd->first_minor = 0;
Devices->gd->fops = &block_fops;
Devices->gd->queue = Devices->queue;
Devices->gd->private_data = Devices;
set_capacity(Devices->gd, MY_BLOCK_SIZE>>9);
add_disk(Devices->gd);
return 0;
}
static void __exit block_exit(void)
{
if (Devices->gd)
del_gendisk(Devices->gd);
if (Devices->queue)
blk_cleanup_queue(Devices->queue);
if (Devices -> data)
vfree(Devices->data);
unregister_blkdev(block_major, "My_block");
kfree(Devices);
}
module_init(block_init);
module_exit(block_exit); |
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