static void recover_from_log(void)
{
read_head();
install_trans(); // if committed, copy from log to disk
log.lh.n = 0;
write_head(); // clear the log
}
static void
recover_from_log(void)
{
read_head();
cprintf("recovery: n=%d\n", log.lh.n);
install_trans();
log.lh.n = 0;
write_head();
}
static void
commit(void)
{
if (log.lh.n > 0) {
write_log(); // Write modified blocks from cache to log
write_head(); // Write header to disk -- the real commit
install_trans(); // Now install writes to home locations
log.lh.n = 0;
write_head(); // Erase the transaction from the log
}
}
void commit_trans(void)
{
if (log.lh.n > 0) {
write_head(); // Write header to disk -- the real commit
install_trans(); // Now install writes to home locations
log.lh.n = 0;
write_head(); // Erase the transaction from the log
}
acquire(&log.lock);
log.busy = 0;
wakeup(&log);
release(&log.lock);
}
void
commit_trans(void)
{
if (log.lh.n > 0) {
write_head(); // Causes all blocks till log.head to be commited
install_trans(); // Install all the transactions till head
log.lh.n = 0;
write_head(); // Reclaim log
}
acquire(&log.lock);
log.intrans = 0;
wakeup(&log);
release(&log.lock);
}