int sfs_initialize(int erase)
{
if (erase == 1)
{
new_filesystem();
put_super_blk();
put_inode_table();
// open root folder /
int fd = sfs_open("/");
if (fd >= 0) {
printf("%s %d\n", "Root folder / is opened. File descriptor:", fd);
}
return 0;
}
else
{
get_inode_table_from_disk();
return 1;
}
return -1;
}
// *pathname - the path of the new file or directory(file)
// type - if the file at the pathname should be a file or directory.
// When type = 1, file is a directory, otherwise the file is a file.
int sfs_create(char *pathname, int type) {
// parse pathname and store reference to cnum
int result;
int cnum = 0;
result = parse_pathname(pathname, &cnum);
if(result < 0) {
printf("\nFailed to parse pathname.\n");
return -1;
}
// check if the file already exists and retrieve its inumber
result = fileexists(cnum);
if(result >= 0) { // file already exists
printf("\nThe file already exists.\n");
return -1;
}
// if the result is anything but the last component
if(result != -2) {
return result; // return the value of the result
}
// retrieve the inumber of the parent directory of the new file
result = fileexists(cnum-1);
if(result < 0) {
printf("\nCould not find i_number from parent directory.\n");
return -1;
}
int pinum;
pinum = result;
// retrieve the file pointer table
get_fileptr_table();
// check if there is enough room for a new file
if(file_pointer[pinum] == 120) {
printf("\nThe directory is full.\n");
return -1;
}
char ninum[3];
sprintf(ninum, "%d", get_firstfree_inode());
// get the first free block available to store the file
int freeblock;
freeblock = get_firstfree_blk();
// retrieve the inumber table
get_inode_table();
// create either a file or directory
// directory are -1*freeblock
// files are freeblock
if(type) {
file_blockno[0][atoi(ninum)] = -1*freeblock;
} else {
file_blockno[0][atoi(ninum)] = freeblock;
}
// get the block from the parent directory
get_block(-1*(file_blockno[0][pinum]), directory_pointer);
// Get the names of the newly creating file names
char file_name[FILE_NAME_LENGTH + 1];
strcpy(file_name, pathname_parse[cnum-1]);
int i;
// check for file_name lengths to be file name length limit
if(strlen(file_name) < 6) {
// pad the filename with spaces
for(i = strlen(file_name); i < FILE_NAME_LENGTH; i++) {
file_name[i] = ' ';
}
}
// Creating a new entry in parent directory
for(i = 0; i < 6; i++) {
directory_pointer[file_pointer[pinum] + i] = file_name[i];
}
directory_pointer[file_pointer[pinum] + 6] = ninum[0];
directory_pointer[file_pointer[pinum] + 7] = ninum[1];
directory_pointer[file_pointer[pinum] + 8] = ' ';
directory_pointer[file_pointer[pinum] + 9] = ' ';
// increase the size of the file_pointer[pinum] by 10
file_pointer[pinum] = file_pointer[pinum] + 10;
// saves the new info in the parent directory
put_block(-1*(file_blockno[0][pinum]), directory_pointer);
// save inode and file pointer to the disk
put_inode_table();
put_fileptr_table();
return 1; // success
}
