inodelist_memory.cpp

来自「模拟Linux文件系统 在任一OS下」· C++ 代码 · 共 34 行

#include"disk.h"
extern disk DISK;
void inodelist_memory::inodelist_memory_ini(){
	for(int i=0;i<inodelist_memoryamount;i++)
		usetimes[i]=0;
}
inode*inodelist_memory::inodelist_memory_searchbyinodenum(int inodenum)//按inode号查找表，若找到则表的usetimes++，若找不到则按inodenum从硬盘写入表，返回inode指针
{
	for(int i=0;i<inodelist_memoryamount;i++){
		if(inodelist[i].inode_num==inodenum&&usetimes[i]!=0){
			usetimes[i]++;
			return  inodelist+i;
		}
	}
	for(i=0;i<inodelist_memoryamount;i++){
		if(usetimes[i]==0){
			inode itemp;
			inodelist_disk ild(DISK.iof);
			ild.inodelist_disk_read(inodenum,&itemp);//根据inode号读inode
			inodelist[i]=itemp;
			usetimes[i]=1;
			return inodelist+i;
		}
	}
	cout<<"there is no free space in inodelist_memory"<<endl;
	exit(0);
	return NULL;
}
void inodelist_memory::deleteitem(inode*it){
	usetimes[it-inodelist]=0;
}