Split blockstore implementation and interface header
This commit is contained in:
Vitaliy Filippov
@@ -0,0 +1,303 @@
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#include "blockstore_impl.h"
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blockstore_impl_t::blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop)
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{
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assert(sizeof(blockstore_op_private_t) <= BS_OP_PRIVATE_DATA_SIZE);
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this->ringloop = ringloop;
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ring_consumer.loop = [this]() { loop(); };
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ringloop->register_consumer(ring_consumer);
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initialized = 0;
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block_order = strtoull(config["block_size_order"].c_str(), NULL, 10);
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if (block_order == 0)
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{
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block_order = DEFAULT_ORDER;
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}
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block_size = 1 << block_order;
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if (block_size < MIN_BLOCK_SIZE || block_size >= MAX_BLOCK_SIZE)
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{
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throw std::runtime_error("Bad block size");
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}
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zero_object = (uint8_t*)memalign(DISK_ALIGNMENT, block_size);
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data_fd = meta_fd = journal.fd = -1;
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try
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{
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open_data(config);
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open_meta(config);
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open_journal(config);
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calc_lengths(config);
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data_alloc = new allocator(block_count);
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}
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catch (std::exception & e)
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{
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if (data_fd >= 0)
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close(data_fd);
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if (meta_fd >= 0 && meta_fd != data_fd)
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close(meta_fd);
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if (journal.fd >= 0 && journal.fd != meta_fd)
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close(journal.fd);
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throw;
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}
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int flusher_count = strtoull(config["flusher_count"].c_str(), NULL, 10);
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if (!flusher_count)
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flusher_count = 32;
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flusher = new journal_flusher_t(flusher_count, this);
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}
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blockstore_impl_t::~blockstore_impl_t()
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{
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delete data_alloc;
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delete flusher;
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free(zero_object);
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ringloop->unregister_consumer(ring_consumer);
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if (data_fd >= 0)
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close(data_fd);
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if (meta_fd >= 0 && meta_fd != data_fd)
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close(meta_fd);
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if (journal.fd >= 0 && journal.fd != meta_fd)
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close(journal.fd);
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if (metadata_buffer)
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free(metadata_buffer);
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}
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bool blockstore_impl_t::is_started()
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{
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return initialized == 10;
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}
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// main event loop - produce requests
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void blockstore_impl_t::loop()
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{
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if (initialized != 10)
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{
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// read metadata, then journal
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if (initialized == 0)
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{
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metadata_init_reader = new blockstore_init_meta(this);
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initialized = 1;
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}
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if (initialized == 1)
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{
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int res = metadata_init_reader->loop();
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if (!res)
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{
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delete metadata_init_reader;
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metadata_init_reader = NULL;
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journal_init_reader = new blockstore_init_journal(this);
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initialized = 2;
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}
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}
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if (initialized == 2)
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{
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int res = journal_init_reader->loop();
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if (!res)
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{
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delete journal_init_reader;
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journal_init_reader = NULL;
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initialized = 10;
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}
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}
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}
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else
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{
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// try to submit ops
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auto cur_sync = in_progress_syncs.begin();
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while (cur_sync != in_progress_syncs.end())
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{
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continue_sync(*cur_sync++);
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}
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auto cur = submit_queue.begin();
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int has_writes = 0;
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while (cur != submit_queue.end())
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{
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auto op_ptr = cur;
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auto op = *(cur++);
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// FIXME: This needs some simplification
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// Writes should not block reads if the ring is not full and if reads don't depend on them
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// In all other cases we should stop submission
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if (PRIV(op)->wait_for)
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{
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check_wait(op);
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if (PRIV(op)->wait_for == WAIT_SQE)
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{
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break;
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}
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else if (PRIV(op)->wait_for)
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{
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if ((op->flags & OP_TYPE_MASK) == OP_WRITE ||
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(op->flags & OP_TYPE_MASK) == OP_DELETE)
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{
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has_writes = 2;
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}
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continue;
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}
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}
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unsigned ring_space = io_uring_sq_space_left(&ringloop->ring);
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unsigned prev_sqe_pos = ringloop->ring.sq.sqe_tail;
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int dequeue_op = 0;
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if ((op->flags & OP_TYPE_MASK) == OP_READ)
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{
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dequeue_op = dequeue_read(op);
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}
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else if ((op->flags & OP_TYPE_MASK) == OP_WRITE ||
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(op->flags & OP_TYPE_MASK) == OP_DELETE)
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{
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if (has_writes == 2)
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{
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// Some writes could not be submitted
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break;
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}
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dequeue_op = dequeue_write(op);
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has_writes = dequeue_op ? 1 : 2;
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}
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else if ((op->flags & OP_TYPE_MASK) == OP_SYNC)
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{
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// wait for all small writes to be submitted
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// wait for all big writes to complete, submit data device fsync
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// wait for the data device fsync to complete, then submit journal writes for big writes
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// then submit an fsync operation
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if (has_writes)
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{
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// Can't submit SYNC before previous writes
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continue;
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}
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dequeue_op = dequeue_sync(op);
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}
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else if ((op->flags & OP_TYPE_MASK) == OP_STABLE)
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{
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dequeue_op = dequeue_stable(op);
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}
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if (dequeue_op)
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{
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submit_queue.erase(op_ptr);
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}
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else
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{
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ringloop->ring.sq.sqe_tail = prev_sqe_pos;
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if (PRIV(op)->wait_for == WAIT_SQE)
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{
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PRIV(op)->wait_detail = 1 + ring_space;
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// ring is full, stop submission
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break;
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}
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}
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}
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if (!readonly)
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{
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flusher->loop();
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}
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int ret = ringloop->submit();
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if (ret < 0)
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{
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throw std::runtime_error(std::string("io_uring_submit: ") + strerror(-ret));
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}
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}
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}
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bool blockstore_impl_t::is_safe_to_stop()
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{
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// It's safe to stop blockstore when there are no in-flight operations,
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// no in-progress syncs and flusher isn't doing anything
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if (submit_queue.size() > 0 || in_progress_syncs.size() > 0 || !readonly && flusher->is_active())
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{
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return false;
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}
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if (unsynced_big_writes.size() > 0 || unsynced_small_writes.size() > 0)
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{
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if (!readonly && !stop_sync_submitted)
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{
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// We should sync the blockstore before unmounting
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blockstore_op_t *op = new blockstore_op_t;
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op->flags = OP_SYNC;
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op->buf = NULL;
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op->callback = [](blockstore_op_t *op)
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{
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delete op;
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};
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enqueue_op(op);
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stop_sync_submitted = true;
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}
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return false;
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}
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return true;
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}
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void blockstore_impl_t::check_wait(blockstore_op_t *op)
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{
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if (PRIV(op)->wait_for == WAIT_SQE)
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{
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if (io_uring_sq_space_left(&ringloop->ring) < PRIV(op)->wait_detail)
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{
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// stop submission if there's still no free space
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return;
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}
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PRIV(op)->wait_for = 0;
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}
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else if (PRIV(op)->wait_for == WAIT_IN_FLIGHT)
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{
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auto dirty_it = dirty_db.find((obj_ver_id){
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.oid = op->oid,
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.version = PRIV(op)->wait_detail,
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});
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if (dirty_it != dirty_db.end() && IS_IN_FLIGHT(dirty_it->second.state))
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{
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// do not submit
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return;
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}
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PRIV(op)->wait_for = 0;
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}
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else if (PRIV(op)->wait_for == WAIT_JOURNAL)
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{
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if (journal.used_start == PRIV(op)->wait_detail)
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{
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// do not submit
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return;
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}
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PRIV(op)->wait_for = 0;
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}
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else if (PRIV(op)->wait_for == WAIT_JOURNAL_BUFFER)
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{
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if (journal.sector_info[((journal.cur_sector + 1) % journal.sector_count)].usage_count > 0)
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{
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// do not submit
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return;
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}
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PRIV(op)->wait_for = 0;
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}
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else if (PRIV(op)->wait_for == WAIT_FREE)
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{
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if (!data_alloc->get_free_count() && !flusher->is_active())
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{
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return;
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}
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PRIV(op)->wait_for = 0;
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}
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else
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{
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throw std::runtime_error("BUG: op->wait_for value is unexpected");
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}
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}
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void blockstore_impl_t::enqueue_op(blockstore_op_t *op)
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{
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int type = op->flags & OP_TYPE_MASK;
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if (type < OP_READ || type > OP_DELETE || (type == OP_READ || type == OP_WRITE) &&
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(op->offset >= block_size || op->len > block_size-op->offset || (op->len % DISK_ALIGNMENT)) ||
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readonly && type != OP_READ)
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{
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// Basic verification not passed
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op->retval = -EINVAL;
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op->callback(op);
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return;
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}
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// Call constructor without allocating memory. We'll call destructor before returning op back
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new ((void*)op->private_data) blockstore_op_private_t;
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PRIV(op)->wait_for = 0;
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PRIV(op)->sync_state = 0;
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PRIV(op)->pending_ops = 0;
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submit_queue.push_back(op);
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if ((op->flags & OP_TYPE_MASK) == OP_WRITE)
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{
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enqueue_write(op);
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}
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ringloop->wakeup();
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}
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