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Make blockstore list operation return consistent snapshots

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This commit is contained in:
Vitaliy Filippov
2020-03-14 02:10:25 +03:00
parent 6982fe1255
commit 46f9bd2a69
5 changed files with 35 additions and 3 deletions
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blockstore_impl.cpp
+20 -3
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@@ -145,7 +145,7 @@ void blockstore_impl_t::loop()
}
unsigned ring_space = ringloop->space_left();
unsigned prev_sqe_pos = ringloop->save();
int dequeue_op = 0;
bool dequeue_op = false;
if (op->opcode == BS_OP_READ)
{
dequeue_op = dequeue_read(op);
@@ -175,16 +175,33 @@ void blockstore_impl_t::loop()
}
else if (op->opcode == BS_OP_STABLE)
{
if (has_writes == 2)
{
// Don't submit additional flushes before completing previous LISTs
break;
}
dequeue_op = dequeue_stable(op);
}
else if (op->opcode == BS_OP_ROLLBACK)
{
if (has_writes == 2)
{
// Don't submit additional flushes before completing previous LISTs
break;
}
dequeue_op = dequeue_rollback(op);
}
else if (op->opcode == BS_OP_LIST)
{
process_list(op);
dequeue_op = true;
// Block LIST operation by previous modifications,
// so it always returns a consistent state snapshot
if (has_writes == 2 || inflight_writes > 0)
has_writes = 2;
else
{
process_list(op);
dequeue_op = true;
}
}
if (dequeue_op)
{