/**
* Main loop of HD driver.
*
*****************************************************************************/
PUBLIC void task_hd()
{
MESSAGE msg;
init_hd();
while (1) {
send_recv(RECEIVE, ANY, &msg);
int src = msg.source;
switch (msg.type) {
case DEV_OPEN:
hd_open(msg.DEVICE);
break;
case DEV_CLOSE:
hd_close(msg.DEVICE);
break;
case DEV_READ:
case DEV_WRITE:
hd_rdwt(&msg);
break;
case DEV_IOCTL:
hd_ioctl(&msg);
break;
default:
dump_msg("HD driver::unknown msg", &msg);
spin("FS::main_loop (invalid msg.type)");
break;
}
send_recv(SEND, src, &msg);
}
}
PUBLIC void task_hd() {
MESSAGE msg;
init_hd();
printl("Task HD begins.\n");
while (TRUE) {
send_recv(RECEIVE, ANY, &msg);
int src = msg.source;
switch(msg.type) {
case DEV_OPEN:
/* 获得硬盘的信息 */
/* hd_identify(0); */
hd_open(msg.DEVICE);
break;
case DEV_CLOSE:
hd_close(msg.DEVICE);
break;
case DEV_READ:
case DEV_WRITE:
hd_rdwt(&msg);
break;
case DEV_IOCTL:
hd_ioctl(&msg);
break;
default:
panic("HD driver::unknown msg");
}
send_recv(SEND, src, &msg);
}
}
/*
* This returns the size of the passed device in number of 512 blocks (?)
*/
int hd_size(dev_t dev)
{
u_int major = major(dev);
u_int unit = dkunit(dev);
u_int part = dkpart(dev);
struct disk *du;
int val;
if (unit >= MAXDISKS) return(-1);
du = &hd[major].disk[unit];
if (du->dk_state == CLOSED) {
val = hd_open(dev,0,0);
if (val < 0) return(-1);
}
return((int)((u_long)du->dk_lab.d_partitions[part].p_size *
du->dk_lab.d_secsize / 512));
}
/*
功能：
处理硬盘相关请求的任务进程。初始化后，永久运行接收有关硬盘请求的信息
参数：
（无）
返回值：
（无）
*/
void task_hd(){
MESSAGE message;
#ifdef DEBUG_HD
printl("in task_hd\n");
#endif
//初始化硬盘
init_hd();
while(1){
reset_message(&message);
send_receive(RECEIVE,ANY,&message);
int src=message.source_pid;
switch(message.type){
case INFO_FS_OPEN:
hd_open(&message);
break;
case INFO_FS_CLOSE:
hd_close(&message);
break;
case INFO_FS_READ:
case INFO_FS_WRITE:
hd_rdwt(&message);
break;
case INFO_FS_IOCTL:
hd_ioctl(&message);
break;
case INFO_FS_DEVICE:
hd_device_info(&message);
break;
default:
//panic("unkonw message type(%d) in task_hd",src);
break;
}
#ifdef DEBUG_HD
printl("in task_hd\n");
#endif
/* message.source_pid=process2pid(p_process_ready); */
send_receive(SEND,src,&message);
}
}
//--------------------------------------------------------------------------------------------------*/
// 文件系统初始化
void init_fs(void)
{
File_Desc* p_fd;
Inode* p_inode;
no_answer = 0;
for(p_fd = file_table;p_fd < file_table + MAX_ALL_FILE;p_fd++)
p_fd->fd_inode = 0;
for(p_inode = inode_table;p_inode < inode_table + MAX_ALL_INODE;p_inode++)
p_inode->i_cnt = 0;
hd_open(ROOT_DEV);
hd_read(ROOT_DEV,fsbuf,512,1);
DEV_Super_Block* p_sb = (DEV_Super_Block*)fsbuf;
if(p_sb->magic != MAGIC)
fs_make(); // 只在建立文件系统的时候调用，调用之后会覆盖之前的文件系统
hd_read(ROOT_DEV,fsbuf,SECTOR_SIZE * INODE_1ST_SECTS,1); // 获取目录inode
DEV_Inode* p_devinode = (DEV_Inode*)fsbuf;
inode_table[0] = *(Inode*)(p_devinode + 1); // inode_table第0个元素用于存放目录inode
inode_table[0].i_dev = ROOT_DEV;
inode_table[0].i_cnt = 1;
inode_table[0].i_num = 1;
p_inode_de = inode_table;
}
