static int add_entry(struct inode *inode, char *name,ino_t ino)
{
struct buffer *buf;
struct dir_entry *de;
int size=0;
if (!inode)
panic("find_entry:inode is NULL");
for (int i = 0; i < 7 + 512; i++) {
buf = bread(inode->i_dev, minix1_wbmap(inode, i));
if (!buf)
panic("add_entry:can not read buf");
de = (struct dir_entry *) buf->b_data;
for (int j = 0; j < 1024 / sizeof(struct dir_entry); j++) {
if (size<inode->i_size && de->ino) {
size += sizeof(struct dir_entry);
de++;
continue;
}
strncpy(de->name,name,NAME_LEN);
de->ino=ino;
buf->b_flag |= B_DIRTY;
size += sizeof(struct dir_entry);
if (size > inode->i_size) {
inode->i_size = size;
inode->i_flag |= I_DIRTY;
}
brelse(buf);
return 0;
}
brelse(buf);
return 1;
}
return 1;
}
int minix1_file_write(struct inode *inode, char * buf, size_t size, off_t off,
int rw_flag)
{
struct buffer *bh;
int left, chars;
left = size;
while (left) {
bh = bread(inode->i_dev, minix1_wbmap(inode, off / 1024));
if (!bh) {
panic("write file error");
}
chars = min((1024 - off % 1024), left);
memcpy(bh->b_data + off % 1024, buf, chars);
off += chars;
left -= chars;
bh->b_flag|=B_DIRTY;
brelse(bh);
}
return size - left;
}
