forked from vitalif/vitastor
334 lines
11 KiB
C++
334 lines
11 KiB
C++
#include "blockstore.h"
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blockstore::blockstore(spp::sparse_hash_map<std::string, std::string> & config, ring_loop_t *ringloop)
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{
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this->ringloop = ringloop;
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ring_consumer.handle_event = [this](ring_data_t *d) { handle_event(d); };
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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 = stoull(config["block_size_order"]);
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block_size = 1 << block_order;
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if (block_size <= 1 || block_size >= MAX_BLOCK_SIZE)
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{
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throw new std::runtime_error("Bad block size");
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}
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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 = allocator_create(block_count);
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if (!data_alloc)
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throw new std::bad_alloc();
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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 e;
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}
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}
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blockstore::~blockstore()
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{
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ringloop->unregister_consumer(ring_consumer.number);
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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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free(journal.sector_buf);
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free(journal.sector_info);
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}
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// main event loop - handle requests
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void blockstore::handle_event(ring_data_t *data)
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{
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if (initialized != 10)
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{
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if (metadata_init_reader)
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{
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metadata_init_reader->handle_event(data);
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}
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else if (journal_init_reader)
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{
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journal_init_reader->handle_event(data);
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}
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}
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else
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{
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struct blockstore_operation* op = (struct blockstore_operation*)data->op;
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if ((op->flags & OP_TYPE_MASK) == OP_READ_DIRTY ||
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(op->flags & OP_TYPE_MASK) == OP_READ)
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{
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op->pending_ops--;
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if (data->res < 0)
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{
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// read error
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op->retval = data->res;
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}
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if (op->pending_ops == 0)
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{
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if (op->retval == 0)
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op->retval = op->len;
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op->callback(op);
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in_process_ops.erase(op);
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}
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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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op->pending_ops--;
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if (data->res < 0)
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{
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// write error
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// FIXME: our state becomes corrupted after a write error. maybe do something better than just die
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throw new std::runtime_error("write operation failed. in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111");
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}
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if (op->min_used_journal_sector > 0)
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{
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for (uint64_t s = op->min_used_journal_sector; s <= op->max_used_journal_sector; s++)
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{
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journal.sector_info[s-1].usage_count--;
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}
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op->min_used_journal_sector = op->max_used_journal_sector = 0;
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}
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if (op->pending_ops == 0)
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{
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// Acknowledge write without sync
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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 = op->version,
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});
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dirty_it->second.state = (dirty_it->second.state == ST_J_SUBMITTED
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? ST_J_WRITTEN : (dirty_it->second.state == ST_DEL_SUBMITTED ? ST_DEL_WRITTEN : ST_D_WRITTEN));
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op->retval = op->len;
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op->callback(op);
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in_process_ops.erase(op);
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unsynced_writes.push_back((obj_ver_id){
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.oid = op->oid,
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.version = op->version,
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});
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}
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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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if (op->min_used_journal_sector > 0)
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{
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for (uint64_t s = op->min_used_journal_sector; s <= op->max_used_journal_sector; s++)
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{
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journal.sector_info[s-1].usage_count--;
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}
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op->min_used_journal_sector = op->max_used_journal_sector = 0;
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}
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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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}
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}
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}
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// main event loop - produce requests
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void blockstore::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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else 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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else 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 = submit_queue.begin();
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bool has_writes = false;
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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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if (op->wait_for)
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{
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if (op->wait_for == WAIT_SQE)
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{
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if (io_uring_sq_space_left(ringloop->ring) < op->wait_detail)
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{
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// stop submission if there's still no free space
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break;
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}
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op->wait_for = 0;
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}
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else if (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 = 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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continue;
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}
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op->wait_for = 0;
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}
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else if (op->wait_for == WAIT_JOURNAL)
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{
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if (journal.used_start < op->wait_detail)
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{
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// do not submit
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continue;
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}
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op->wait_for = 0;
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}
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else if (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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continue;
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}
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op->wait_for = 0;
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}
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else
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{
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throw new std::runtime_error("BUG: op->wait_for value is unexpected");
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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_DIRTY ||
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(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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has_writes = true;
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dequeue_op = dequeue_write(op);
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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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}
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if (dequeue_op)
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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 new std::runtime_error(std::string("io_uring_submit: ") + strerror(-ret));
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}
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submit_queue.erase(op_ptr);
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in_process_ops.insert(op);
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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 (op->wait_for == WAIT_SQE)
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{
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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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}
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}
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int blockstore::enqueue_op(blockstore_operation *op)
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{
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if (op->offset >= block_size || op->len >= block_size-op->offset ||
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(op->len % DISK_ALIGNMENT) ||
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(op->flags & OP_TYPE_MASK) < OP_READ || (op->flags & OP_TYPE_MASK) > OP_DELETE)
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{
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// Basic verification not passed
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return -EINVAL;
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}
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op->wait_for = 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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// Assign version number
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auto dirty_it = dirty_db.upper_bound((obj_ver_id){
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.oid = op->oid,
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.version = UINT64_MAX,
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});
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dirty_it--;
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if (dirty_it != dirty_db.end() && dirty_it->first.oid == op->oid)
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{
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op->version = dirty_it->first.version + 1;
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}
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else
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{
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auto clean_it = object_db.find(op->oid);
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if (clean_it != object_db.end())
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{
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op->version = clean_it->second.version + 1;
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}
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else
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{
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op->version = 1;
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}
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}
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// Immediately add the operation into dirty_db, so subsequent reads could see it
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dirty_db.emplace((obj_ver_id){
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.oid = op->oid,
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.version = op->version,
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}, (dirty_entry){
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.state = ST_IN_FLIGHT,
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.flags = 0,
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.location = 0,
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.offset = op->offset,
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.size = op->len,
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});
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}
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return 0;
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}
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