6 changed files with 324 additions and 223 deletions
@ -0,0 +1,190 @@ |
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#include "blockstore.h" |
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#define SYNC_NO_BIG 1 |
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#define SYNC_HAS_BIG 2 |
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#define SYNC_DATA_SYNC_SENT 3 |
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#define SYNC_JOURNAL_SYNC_SENT 4 |
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#define SYNC_DONE 5 |
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|
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int blockstore::dequeue_sync(blockstore_operation *op) |
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{ |
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if (op->sync_state == 0) |
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{ |
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op->big_write_count = 0; |
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op->sync_state = SYNC_NO_BIG; |
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op->sync_writes.swap(unsynced_writes); |
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unsynced_writes.clear(); |
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if (op->sync_writes.size() == 0) |
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{ |
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op->sync_state = SYNC_DONE; |
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} |
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auto it = op->sync_writes.begin(); |
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while (it != op->sync_writes.end()) |
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{ |
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uint32_t state = dirty_db[*it].state; |
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if (IS_BIG_WRITE(state)) |
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{ |
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op->big_write_count++; |
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op->sync_state = SYNC_HAS_BIG; |
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} |
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it++; |
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} |
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} |
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if (op->sync_state == SYNC_NO_BIG) |
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{ |
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// No big writes, just fsync the journal
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BS_SUBMIT_GET_SQE(sqe, data); |
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io_uring_prep_fsync(sqe, journal.fd, 0); |
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data->op = op; |
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op->pending_ops = 1; |
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op->sync_state = SYNC_JOURNAL_SYNC_SENT; |
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} |
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else if (op->sync_state == SYNC_HAS_BIG) |
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{ |
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// 1st step: fsync data
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BS_SUBMIT_GET_SQE(sqe, data); |
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io_uring_prep_fsync(sqe, data_fd, 0); |
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data->op = op; |
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op->pending_ops = 1; |
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op->sync_state = SYNC_DATA_SYNC_SENT; |
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} |
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else if (op->sync_state == SYNC_DATA_SYNC_SENT) |
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{ |
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// 2nd step: Data device is synced, prepare & write journal entries
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// Check space in the journal and journal memory buffers
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int required = op->big_write_count, sectors_required = 1; |
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uint64_t next_pos = journal.next_free, next_sector = journal.cur_sector; |
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while (1) |
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{ |
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int fits = (512 - journal.in_sector_pos) / sizeof(journal_entry_big_write); |
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required -= fits; |
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if (required <= 0) |
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break; |
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next_pos = (next_pos+512) < journal.len ? next_pos+512 : 512; |
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sectors_required++; |
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next_sector = ((next_sector + 1) % journal.sector_count); |
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if (journal.sector_info[next_sector].usage_count > 0) |
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{ |
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// No memory buffer available. Wait for it.
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op->wait_for = WAIT_JOURNAL_BUFFER; |
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return 0; |
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} |
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} |
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if (next_pos >= journal.used_start) |
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{ |
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// No space in the journal. Wait for it.
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op->wait_for = WAIT_JOURNAL; |
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op->wait_detail = next_pos; |
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return 0; |
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} |
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// Get SQEs. Don't bother about merging, submit each journal sector as a separate request
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struct io_uring_sqe *sqe[sectors_required+1]; |
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for (int i = 0; i < sectors_required+1; i++) |
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{ |
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BS_SUBMIT_GET_SQE_DECL(sqe[i]); |
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} |
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// Prepare and submit journal entries
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op->min_used_journal_sector = 1 + journal.cur_sector; |
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sectors_required = 0; |
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required = op->big_write_count; |
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// FIXME: advance it
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auto it = op->sync_writes.begin(); |
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while (1) |
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{ |
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int fits = (512 - journal.in_sector_pos) / sizeof(journal_entry_big_write); |
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while (fits > 0 && required > 0) |
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{ |
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journal_entry_big_write *je = (journal_entry_big_write*)( |
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journal.sector_buf + 512*journal.cur_sector + journal.in_sector_pos |
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); |
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*je = { |
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.crc32 = 0, |
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.magic = JOURNAL_MAGIC, |
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.type = JE_BIG_WRITE, |
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.size = sizeof(journal_entry_big_write), |
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.crc32_prev = journal.crc32_last, |
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.oid = it->oid, |
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.version = it->version, |
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.block = dirty_db[*it].location, |
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}; |
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je->crc32 = je_crc32((journal_entry*)je); |
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journal.crc32_last = je->crc32; |
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journal.in_sector_pos += sizeof(journal_entry_big_write); |
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required--; |
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} |
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if (required <= 0) |
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break; |
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journal.sector_info[journal.cur_sector].usage_count++; |
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struct ring_data_t *data = ((ring_data_t*)sqe[sectors_required]->user_data); |
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data->iov = (struct iovec){ journal.sector_buf + 512*journal.cur_sector, 512 }; |
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data->op = op; |
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io_uring_prep_writev( |
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sqe[sectors_required], journal.fd, &data->iov, 1, journal.offset + journal.sector_info[journal.cur_sector].offset |
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); |
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journal.cur_sector = ((journal.cur_sector + 1) % journal.sector_count); |
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journal.sector_info[journal.cur_sector].offset = journal.next_free; |
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journal.in_sector_pos = 0; |
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journal.next_free = (journal.next_free + 512) < journal.len ? journal.next_free + 512 : 512; |
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memset(journal.sector_buf + 512*journal.cur_sector, 0, 512); |
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sectors_required++; |
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} |
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// ... And a journal fsync
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io_uring_prep_fsync(sqe[sectors_required], journal.fd, 0); |
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struct ring_data_t *data = ((ring_data_t*)sqe[sectors_required]->user_data); |
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data->op = op; |
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op->pending_ops = 1 + sectors_required; |
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op->max_used_journal_sector = 1 + journal.cur_sector; |
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op->sync_state = SYNC_JOURNAL_SYNC_SENT; |
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} |
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// FIXME: resubmit op from in_progress
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op->prev_sync_count = in_progress_syncs.size(); |
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op->in_progress_ptr = in_progress_syncs.insert(in_progress_syncs.end(), op); |
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return 1; |
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} |
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void blockstore::handle_sync_event(ring_data_t *data, blockstore_operation *op) |
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{ |
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if (data->res < 0) |
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{ |
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// sync 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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op->pending_ops--; |
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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 = (s + 1) % journal.sector_count) |
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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 sync
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auto it = op->in_progress_ptr; |
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int done_syncs = 1; |
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++it; |
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while (it != in_progress_syncs.end()) |
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{ |
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auto & next_sync = *it; |
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next_sync->prev_sync_count -= done_syncs; |
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if (next_sync->prev_sync_count == 0/* && next_sync->DONE*/) |
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{ |
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done_syncs++; |
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auto next_it = it; |
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it++; |
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in_progress_syncs.erase(next_it); |
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next_sync->retval = 0; |
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next_sync->callback(next_sync); |
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in_progress_ops.erase(next_sync); |
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} |
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else |
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it++; |
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} |
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in_progress_syncs.erase(op->in_progress_ptr); |
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op->retval = 0; |
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op->callback(op); |
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in_progress_ops.erase(op); |
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} |
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} |
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