int main(int argc, char **argv) {
if(argc != 3) {
fprintf(stderr, "Usage: ext2_mkdir <image file name> <path to file>\n");
exit(1);
}
disk_initialization(argv[1]); /* initialize disk */
/* retrieve the inode index for parent directory */
unsigned int inode_dir = inode_from_path(extract_parent_path(argv[2]));
/* get filename for new directory */
char *filename = extract_filename(argv[2]);
if (dir_find(inode_dir, filename)) {
// Case: filename already exists
fprintf(stderr, "%s: already exists\n", argv[2]);
exit(EEXIST);
}
/* allocate inode for new directory */
unsigned int new_inode = allocate_inode();
/* initialize the new directory inode and add as entry to parent directory */
init_dir_inode(new_inode, inode_dir, filename);
return 0;
}
/*创建新的目录项*/
int make_file(int inode, char* name, int type)
{
char original_name_path[30];
int original_inode = inode_num;//记录当前的inode
strcpy(original_name_path, name);
if (eat_path(name) == -1) {
if (type == File)
printf("touch: cannot touch‘%s’: No such file or directory\n", original_name_path);
if (type == Directory)
printf("mkdir: cannot create directory ‘%s’: No such file or directory\n", original_name_path);
return -1;
}
int new_node;
int blk_need = 1;//本目录需要增加磁盘块则blk_need=2
int t;
Inode temp;
/*读取当前目录的Inode*/
fseek(Disk, InodeBeg + sizeof(Inode)*inode, SEEK_SET);
fread(&temp, sizeof(Inode), 1, Disk);
if (temp.access[1] == 0) { //当前目录不允许写
if (type == Directory)
printf("mkdir: cannot create directory ‘%s’: Permission denied\n", original_name_path);
if (type == File)
printf("touch: cannot touch ‘%s’: Permission denied\n", original_name_path);
close_dir(inode_num);
inode_num = original_inode;
open_dir(inode_num);
return -1;
}
if (dir_num>MaxDirNum) {//超过了目录文件能包含的最大目录项
if (type == Directory)
printf("mkdir: cannot create directory '%s' : Directory full\n", original_name_path);
if (type == File)
printf("touch: cannot create file '%s' : Directory full\n", original_name_path);
close_dir(inode_num);
inode_num = original_inode;
open_dir(inode_num);
return -1;
}
if (check_name(inode, name) != -1) {//防止重命名
if (type == Directory)
printf("mkdir: cannnot create directory '%s' : Directory exist\n", original_name_path);
if (type == File)
printf("touch: cannot create file '%s' : File exist\n", original_name_path);
close_dir(inode_num);
inode_num = original_inode;
open_dir(inode_num);
return -1;
}
if (dir_num / DirPerBlk != (dir_num + 1) / DirPerBlk) {//本目录也要增加磁盘块
blk_need = 2;
}
// printf("blk_used:%d\n",super_blk.blk_used);
if (super_blk.blk_used + blk_need>BlkNum) {
if (type == Directory)
printf("mkdir: cannot create directory '%s' :Block used up\n", original_name_path);
if (type == File)
printf("touch: cannot create file '%s' : Block used up\n", original_name_path);
close_dir(inode_num);
inode_num = original_inode;
open_dir(inode_num);
return -1;
}
if (blk_need == 2) {//本目录需要增加磁盘块
t = curr_inode.blk_num++;
curr_inode.blk_identifier[t] = get_blk();
}
/*申请inode*/
new_node = apply_inode();
if (new_node == -1) {
if (type == Directory)
printf("mkdir: cannot create directory '%s' :Inode used up\n", original_name_path);
if (type == File)
printf("touch: cannot create file '%s' : Inode used up\n", original_name_path);
close_dir(inode_num);
inode_num = original_inode;
open_dir(inode_num);
return -1;
}
if (type == Directory) {
/*初始化新建目录的inode*/
init_dir_inode(new_node, inode);
}
else if (type == File) {
/*初始化新建文件的inode*/
init_file_inode(new_node);
}
strcpy(dir_table[dir_num].name, name);
dir_table[dir_num++].inode_num = new_node;
close_dir(inode_num);
inode_num = original_inode;
open_dir(inode_num);
return 0;
}
