/* Detect FS type on device and returt pointer to static structure from fstype.c */
const char *detect_fstype(char *device, struct charlist *fl)
{
int fd;
const char *fstype;
fd = open(device, O_RDONLY);
if (fd < 0) {
log_msg(lg, "+ can't open device: %s", ERRMSG);
return NULL;
}
if ( 0 != identify_fs(fd, &fstype, NULL, 0) ) {
close(fd);
log_msg(lg, "+ can't identify FS type");
return NULL;
}
close(fd);
log_msg(lg, "+ FS type '%s' detected", fstype);
/* Check that FS is known */
if (in_charlist(fl, fstype) < 0) {
/* whitelist 'ubi', we assume it is ubifs */
if (!strncmp(fstype, "ubi",3)) {
log_msg(lg, "+ found %s container: assume ubifs", fstype);
} else {
log_msg(lg, "+ FS %s is not supported by kernel", fstype);
return NULL;
}
}
return(fstype);
}
/*
* Interpret filesystem auto type if necessary
*/
static void interpret_type(struct fs_info *fs)
{
const char *type;
if (strcmp(fs->type, "auto") == 0) {
type = identify_fs(fs->device);
if (type) {
free(fs->type);
fs->type = string_copy(type);
} else
fprintf(stderr, _("Could not determine "
"filesystem type for %s\n"),
fs->device);
}
}
/*main*/
void HariMain(void){
fs_pid=get_pid();
while(identify_hd()==FALSE);
while(identify_fs()==FALSE);//读取superBlock
/*如果硬盘上不存在文件系统，则新建一个。注：约定tinyOS文件系统的superBlock前5字节为字符串“TINY”*/
if(strcmp(superBlock.sign,"TINY")==FALSE)
{
create_fs();
identify_fs();/*因为之前读取的可能无效，当文件系统不存在时*/
}
read_hd_bmp ();
read_fat();
while(1)
{
receive(&msg_recv,STATUS_RECV_ANY,0,fs_pid);
u_int32 recv_type=msg_recv.type;
u_int32 send_pid =msg_recv.send_pid;
switch(recv_type)
{
case FILE_MSG_TYPE:
{
struct FILE_MSG *msg =&msg_recv.u.msg_file;
u_int32 file_msg_type=msg->type ;
int8*file_name =msg->file_name ;
void*buf =msg->buf ;
u_int32 buf_len =msg->buf_len ;
u_int32 handle =msg->handle ;
u_int32 result ;
struct I_NODE*inode =msg->inode ;
switch(file_msg_type)
{
case FILE_IDENTIFY:
if(identify_file(handle,inode,send_pid)==TRUE )
awake(send_pid,TRUE );
else
awake(send_pid,FALSE );
break;
case FILE_OPEN :
handle=open_file(file_name,send_pid);
awake(send_pid,handle);
break;
case FILE_READ :
if((result=read_file(handle,buf_len,buf,send_pid))!=FALSE)
awake(send_pid,result );
else
awake(send_pid,FALSE );
break;
case FILE_WRITE :
if(write_file(handle,buf_len,buf,send_pid)==TRUE )
awake(send_pid,TRUE );
else
awake(send_pid,FALSE);
break;
case FILE_CREATE :
if(create_file(file_name,send_pid)==TRUE )
awake(send_pid,TRUE );
else
awake(send_pid,FALSE);
break;
case FILE_DELETE :
if(delete_file(handle,send_pid)==TRUE )
awake(send_pid,TRUE );
else
awake(send_pid,FALSE );
break;
case POWER_OFF :
write_back( );
awake(send_pid,TRUE );
break;
default:
awake(send_pid,FALSE );
break;
}
break;
}
default:
break;
}
}
}
