// Get metadata about file f.
int
filestat(struct file *f, struct stat *st)
{
uchar cksum;
struct buf *bp;
int i;
if(f->type == FD_INODE){
ilock(f->ip);
stati(f->ip, st);
cksum = getcksum(f->ip->addrs[0]);
for(i = 1; i < NDIRECT; i++){
cksum = cksum ^ getcksum(f->ip->addrs[i]);
}
bp = bread(f->ip->dev, getptr(f->ip->addrs[NDIRECT]));
uint *a;
a = (uint*)bp->data;
for(i = 0; i < 512/sizeof(uint); i++){
cksum = cksum ^ getcksum(a[i]);
}
st->checksum = cksum;
iunlock(f->ip);
return 0;
}
return -1;
}
// Get metadata about file f.
int
filestat(struct file *f, struct stat *st)
{
if(f->type == FD_INODE){
ilock(f->ip);
stati(f->ip, st);
iunlock(f->ip);
return 0;
}
return -1;
}
