619 lines
20 KiB
C++
619 lines
20 KiB
C++
#include "blockstore.h"
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journal_flusher_t::journal_flusher_t(int flusher_count, blockstore *bs)
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{
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this->bs = bs;
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this->flusher_count = flusher_count;
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active_flushers = 0;
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active_until_sync = 0;
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sync_threshold = flusher_count == 1 ? 1 : flusher_count/2;
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journal_trim_interval = sync_threshold;
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journal_trim_counter = 0;
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journal_superblock = bs->journal.inmemory ? bs->journal.buffer : memalign(512, 512);
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co = new journal_flusher_co[flusher_count];
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for (int i = 0; i < flusher_count; i++)
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{
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co[i].bs = bs;
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co[i].flusher = this;
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}
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}
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journal_flusher_co::journal_flusher_co()
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{
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wait_state = 0;
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simple_callback_r = [this](ring_data_t* data)
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{
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if (data->res != data->iov.iov_len)
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{
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throw std::runtime_error(
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"data read operation failed during flush ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
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"). can't continue, sorry :-("
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);
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}
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wait_count--;
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};
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simple_callback_w = [this](ring_data_t* data)
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{
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if (data->res != data->iov.iov_len)
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{
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throw std::runtime_error(
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"write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
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"). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
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);
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}
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wait_count--;
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};
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}
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journal_flusher_t::~journal_flusher_t()
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{
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if (!bs->journal.inmemory)
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free(journal_superblock);
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delete[] co;
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}
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bool journal_flusher_t::is_active()
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{
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return active_flushers > 0 || flush_queue.size() > 0;
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}
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void journal_flusher_t::loop()
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{
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for (int i = 0; i < flusher_count; i++)
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{
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if (!active_flushers && !flush_queue.size())
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{
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return;
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}
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co[i].loop();
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}
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}
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void journal_flusher_t::enqueue_flush(obj_ver_id ov)
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{
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auto it = flush_versions.find(ov.oid);
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if (it != flush_versions.end())
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{
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if (it->second < ov.version)
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it->second = ov.version;
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}
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else
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{
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flush_versions[ov.oid] = ov.version;
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flush_queue.push_back(ov.oid);
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}
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}
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void journal_flusher_t::unshift_flush(obj_ver_id ov)
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{
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auto it = flush_versions.find(ov.oid);
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if (it != flush_versions.end())
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{
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if (it->second < ov.version)
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it->second = ov.version;
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}
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else
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{
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flush_versions[ov.oid] = ov.version;
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flush_queue.push_front(ov.oid);
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}
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}
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#define await_sqe(label) \
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resume_##label:\
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sqe = bs->get_sqe();\
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if (!sqe)\
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{\
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wait_state = label;\
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return false;\
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}\
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data = ((ring_data_t*)sqe->user_data);
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bool journal_flusher_co::loop()
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{
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// This is much better than implementing the whole function as an FSM
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// Maybe I should consider a coroutine library like https://github.com/hnes/libaco ...
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if (wait_state == 1)
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goto resume_1;
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else if (wait_state == 2)
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goto resume_2;
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else if (wait_state == 3)
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goto resume_3;
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else if (wait_state == 4)
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goto resume_4;
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else if (wait_state == 5)
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goto resume_5;
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else if (wait_state == 6)
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goto resume_6;
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else if (wait_state == 7)
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goto resume_7;
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else if (wait_state == 8)
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goto resume_8;
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else if (wait_state == 9)
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goto resume_9;
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else if (wait_state == 10)
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goto resume_10;
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else if (wait_state == 11)
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goto resume_11;
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else if (wait_state == 12)
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goto resume_12;
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else if (wait_state == 13)
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goto resume_13;
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else if (wait_state == 14)
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goto resume_14;
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else if (wait_state == 15)
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goto resume_15;
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resume_0:
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if (!flusher->flush_queue.size())
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{
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wait_state = 0;
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return true;
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}
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cur.oid = flusher->flush_queue.front();
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cur.version = flusher->flush_versions[cur.oid];
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flusher->flush_queue.pop_front();
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flusher->flush_versions.erase(cur.oid);
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dirty_end = bs->dirty_db.find(cur);
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if (dirty_end != bs->dirty_db.end())
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{
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repeat_it = flusher->sync_to_repeat.find(cur.oid);
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if (repeat_it != flusher->sync_to_repeat.end())
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{
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#ifdef BLOCKSTORE_DEBUG
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printf("Postpone %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
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#endif
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// We don't flush different parts of history of the same object in parallel
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// So we check if someone is already flushing this object
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// In that case we set sync_to_repeat and pick another object
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// Another coroutine will see it and re-queue the object after it finishes
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if (repeat_it->second < cur.version)
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repeat_it->second = cur.version;
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goto resume_0;
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}
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else
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flusher->sync_to_repeat[cur.oid] = 0;
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#ifdef BLOCKSTORE_DEBUG
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printf("Flushing %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
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#endif
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dirty_it = dirty_end;
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flusher->active_flushers++;
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flusher->active_until_sync++;
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v.clear();
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wait_count = 0;
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copy_count = 0;
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clean_loc = UINT64_MAX;
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has_delete = false;
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skip_copy = false;
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while (1)
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{
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if (dirty_it->second.state == ST_J_STABLE && !skip_copy)
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{
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// First we submit all reads
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offset = dirty_it->second.offset;
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len = dirty_it->second.len;
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it = v.begin();
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while (1)
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{
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for (; it != v.end(); it++)
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if (it->offset >= offset)
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break;
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if (it == v.end() || it->offset > offset)
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{
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submit_offset = dirty_it->second.location + offset - dirty_it->second.offset;
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submit_len = it == v.end() || it->offset >= offset+len ? len : it->offset-offset;
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it = v.insert(it, (copy_buffer_t){ .offset = offset, .len = submit_len, .buf = memalign(512, submit_len) });
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copy_count++;
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if (bs->journal.inmemory)
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{
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// Take it from memory
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memcpy(v.back().buf, bs->journal.buffer + submit_offset, submit_len);
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}
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else
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{
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// Read it from disk
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await_sqe(1);
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data->iov = (struct iovec){ v.back().buf, (size_t)submit_len };
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data->callback = simple_callback_r;
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my_uring_prep_readv(
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sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + submit_offset
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);
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wait_count++;
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}
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}
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if (it == v.end() || it->offset+it->len >= offset+len)
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{
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break;
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}
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}
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}
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else if (dirty_it->second.state == ST_D_STABLE && !skip_copy)
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{
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// There is an unflushed big write. Copy small writes in its position
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clean_loc = dirty_it->second.location;
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skip_copy = true;
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}
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else if (dirty_it->second.state == ST_DEL_STABLE && !skip_copy)
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{
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// There is an unflushed delete
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has_delete = true;
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skip_copy = true;
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}
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else if (!IS_STABLE(dirty_it->second.state))
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{
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char err[1024];
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snprintf(
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err, 1024, "BUG: Unexpected dirty_entry %lu:%lu v%lu state during flush: %d",
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dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version, dirty_it->second.state
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);
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throw std::runtime_error(err);
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}
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if (dirty_it == bs->dirty_db.begin())
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{
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break;
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}
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dirty_it--;
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if (dirty_it->first.oid != cur.oid)
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{
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break;
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}
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}
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if (copy_count == 0 && clean_loc == UINT64_MAX && !has_delete)
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{
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// Nothing to flush
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flusher->active_flushers--;
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flusher->active_until_sync--;
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repeat_it = flusher->sync_to_repeat.find(cur.oid);
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if (repeat_it->second > cur.version)
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{
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// Requeue version
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flusher->unshift_flush({ .oid = cur.oid, .version = repeat_it->second });
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}
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flusher->sync_to_repeat.erase(repeat_it);
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goto resume_0;
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}
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// Find it in clean_db
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{
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auto clean_it = bs->clean_db.find(cur.oid);
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old_clean_loc = (clean_it != bs->clean_db.end() ? clean_it->second.location : UINT64_MAX);
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old_clean_ver = (clean_it != bs->clean_db.end() ? clean_it->second.version : 0);
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}
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if (clean_loc == UINT64_MAX)
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{
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if (copy_count > 0 && has_delete || old_clean_loc == UINT64_MAX)
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{
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// Object not present at all. This is a bug.
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char err[1024];
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snprintf(
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err, 1024, "BUG: Object %lu:%lu v%lu that we are trying to flush is not allocated on the data device",
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cur.oid.inode, cur.oid.stripe, cur.version
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);
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throw std::runtime_error(err);
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}
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else
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clean_loc = old_clean_loc;
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}
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else
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has_delete = false;
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// Also we need to submit metadata read(s). We do read-modify-write cycle(s) for every operation.
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resume_2:
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if (!modify_meta_read(clean_loc, meta_new, 2))
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{
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wait_state += 2;
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return false;
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}
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if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
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{
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resume_14:
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if (!modify_meta_read(old_clean_loc, meta_old, 14))
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{
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wait_state += 14;
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return false;
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}
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}
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else
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meta_old.submitted = false;
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resume_3:
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if (wait_count > 0)
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{
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wait_state = 3;
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return false;
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}
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if (meta_new.submitted)
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{
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meta_new.it->second.state = 1;
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bs->ringloop->wakeup(bs->ring_consumer);
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}
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if (meta_old.submitted)
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{
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meta_old.it->second.state = 1;
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bs->ringloop->wakeup(bs->ring_consumer);
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}
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// Reads completed, submit writes
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for (it = v.begin(); it != v.end(); it++)
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{
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await_sqe(4);
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data->iov = (struct iovec){ it->buf, (size_t)it->len };
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data->callback = simple_callback_w;
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my_uring_prep_writev(
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sqe, bs->data_fd, &data->iov, 1, bs->data_offset + clean_loc + it->offset
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);
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wait_count++;
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}
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resume_5:
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// And metadata writes, but only after data writes complete
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if (meta_new.it->second.state == 0 || wait_count > 0)
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{
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// metadata sector is still being read or data is still being written, wait for it
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wait_state = 5;
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return false;
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}
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if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
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{
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if (meta_old.it->second.state == 0)
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{
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wait_state = 5;
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return false;
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}
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((clean_disk_entry*)meta_old.it->second.buf)[meta_old.pos] = { 0 };
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await_sqe(15);
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data->iov = (struct iovec){ meta_old.it->second.buf, 512 };
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data->callback = simple_callback_w;
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my_uring_prep_writev(
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sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + meta_old.sector
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);
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wait_count++;
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}
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((clean_disk_entry*)meta_new.it->second.buf)[meta_new.pos] = has_delete
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? (clean_disk_entry){ 0 }
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: (clean_disk_entry){
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.oid = cur.oid,
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.version = cur.version,
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};
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await_sqe(6);
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data->iov = (struct iovec){ meta_new.it->second.buf, 512 };
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data->callback = simple_callback_w;
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my_uring_prep_writev(
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sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + meta_new.sector
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);
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wait_count++;
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resume_7:
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if (wait_count > 0)
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{
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wait_state = 7;
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return false;
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}
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// Done, free all buffers
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meta_new.it->second.usage_count--;
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if (meta_new.it->second.usage_count == 0)
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{
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free(meta_new.it->second.buf);
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flusher->meta_sectors.erase(meta_new.it);
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}
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if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
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{
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meta_old.it->second.usage_count--;
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if (meta_old.it->second.usage_count == 0)
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{
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free(meta_old.it->second.buf);
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flusher->meta_sectors.erase(meta_old.it);
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}
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}
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for (it = v.begin(); it != v.end(); it++)
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{
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free(it->buf);
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}
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v.clear();
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// And sync everything (in batches - not per each operation!)
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flusher->active_until_sync--;
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resume_8:
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resume_9:
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resume_10:
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resume_11:
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if (!fsync_batch())
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{
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return false;
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}
|
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// Update clean_db and dirty_db, free old data locations
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update_clean_db();
|
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// Clear unused part of the journal every <journal_trim_interval> flushes
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if (!((++flusher->journal_trim_counter) % flusher->journal_trim_interval))
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{
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flusher->journal_trim_counter = 0;
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if (bs->journal.trim())
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{
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// Update journal "superblock"
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await_sqe(12);
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data->callback = simple_callback_w;
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*((journal_entry_start*)flusher->journal_superblock) = {
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.crc32 = 0,
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.magic = JOURNAL_MAGIC,
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.type = JE_START,
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.size = sizeof(journal_entry_start),
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.reserved = 0,
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.journal_start = bs->journal.used_start,
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};
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((journal_entry_start*)flusher->journal_superblock)->crc32 = je_crc32((journal_entry*)flusher->journal_superblock);
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data->iov = (struct iovec){ flusher->journal_superblock, 512 };
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my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
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wait_count++;
|
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resume_13:
|
|
if (wait_count > 0)
|
|
{
|
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wait_state = 13;
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return false;
|
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}
|
|
}
|
|
}
|
|
// All done
|
|
#ifdef BLOCKSTORE_DEBUG
|
|
printf("Flushed %lu:%lu v%lu\n", cur.oid.inode, cur.oid.stripe, cur.version);
|
|
#endif
|
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flusher->active_flushers--;
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repeat_it = flusher->sync_to_repeat.find(cur.oid);
|
|
if (repeat_it->second > cur.version)
|
|
{
|
|
// Requeue version
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flusher->unshift_flush({ .oid = cur.oid, .version = repeat_it->second });
|
|
}
|
|
flusher->sync_to_repeat.erase(repeat_it);
|
|
goto resume_0;
|
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}
|
|
return true;
|
|
}
|
|
|
|
bool journal_flusher_co::modify_meta_read(uint64_t meta_loc, flusher_meta_write_t &wr, int wait_base)
|
|
{
|
|
if (wait_state == wait_base)
|
|
goto resume_0;
|
|
// But we must check if the same sector is already in memory.
|
|
// Another option is to keep all raw metadata in memory all the time. FIXME: Maybe add this mode.
|
|
// And yet another option is to use LSM trees for metadata, but it sophisticates everything a lot,
|
|
// so I'll avoid it as long as I can.
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wr.sector = ((meta_loc >> bs->block_order) / (512 / sizeof(clean_disk_entry))) * 512;
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wr.pos = ((meta_loc >> bs->block_order) % (512 / sizeof(clean_disk_entry)));
|
|
wr.it = flusher->meta_sectors.find(wr.sector);
|
|
if (wr.it == flusher->meta_sectors.end())
|
|
{
|
|
// Not in memory yet, read it
|
|
wr.it = flusher->meta_sectors.emplace(wr.sector, (meta_sector_t){
|
|
.offset = wr.sector,
|
|
.len = 512,
|
|
.state = 0, // 0 = not read yet
|
|
.buf = memalign(512, 512),
|
|
.usage_count = 1,
|
|
}).first;
|
|
await_sqe(0);
|
|
data->iov = (struct iovec){ wr.it->second.buf, 512 };
|
|
data->callback = simple_callback_r;
|
|
wr.submitted = true;
|
|
my_uring_prep_readv(
|
|
sqe, bs->meta_fd, &data->iov, 1, bs->meta_offset + wr.sector
|
|
);
|
|
wait_count++;
|
|
}
|
|
else
|
|
{
|
|
wr.submitted = false;
|
|
wr.it->second.usage_count++;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void journal_flusher_co::update_clean_db()
|
|
{
|
|
if (old_clean_loc != UINT64_MAX && old_clean_loc != clean_loc)
|
|
{
|
|
#ifdef BLOCKSTORE_DEBUG
|
|
printf("Free block %lu\n", old_clean_loc >> bs->block_order);
|
|
#endif
|
|
bs->data_alloc->set(old_clean_loc >> bs->block_order, false);
|
|
}
|
|
if (has_delete)
|
|
{
|
|
auto clean_it = bs->clean_db.find(cur.oid);
|
|
bs->clean_db.erase(clean_it);
|
|
bs->data_alloc->set(clean_loc >> bs->block_order, false);
|
|
clean_loc = UINT64_MAX;
|
|
}
|
|
else
|
|
{
|
|
bs->clean_db[cur.oid] = {
|
|
.version = cur.version,
|
|
.location = clean_loc,
|
|
};
|
|
}
|
|
dirty_it = dirty_end;
|
|
while (1)
|
|
{
|
|
if (IS_BIG_WRITE(dirty_it->second.state) && dirty_it->second.location != clean_loc)
|
|
{
|
|
#ifdef BLOCKSTORE_DEBUG
|
|
printf("Free block %lu\n", dirty_it->second.location >> bs->block_order);
|
|
#endif
|
|
bs->data_alloc->set(dirty_it->second.location >> bs->block_order, false);
|
|
}
|
|
#ifdef BLOCKSTORE_DEBUG
|
|
printf("remove usage of journal offset %lu by %lu:%lu v%lu\n", dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
|
|
#endif
|
|
int used = --bs->journal.used_sectors[dirty_it->second.journal_sector];
|
|
if (used == 0)
|
|
{
|
|
bs->journal.used_sectors.erase(dirty_it->second.journal_sector);
|
|
}
|
|
if (dirty_it == bs->dirty_db.begin())
|
|
{
|
|
break;
|
|
}
|
|
dirty_it--;
|
|
if (dirty_it->first.oid != cur.oid)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
// Then, basically, remove everything up to the current version from dirty_db...
|
|
if (dirty_it->first.oid != cur.oid)
|
|
dirty_it++;
|
|
bs->dirty_db.erase(dirty_it, std::next(dirty_end));
|
|
}
|
|
|
|
bool journal_flusher_co::fsync_batch()
|
|
{
|
|
if (wait_state == 8)
|
|
goto resume_8;
|
|
else if (wait_state == 9)
|
|
goto resume_9;
|
|
else if (wait_state == 10)
|
|
goto resume_10;
|
|
else if (wait_state == 11)
|
|
goto resume_11;
|
|
if (!bs->disable_fsync)
|
|
{
|
|
cur_sync = flusher->syncs.end();
|
|
if (cur_sync == flusher->syncs.begin() || cur_sync->state == 1)
|
|
cur_sync = flusher->syncs.emplace(flusher->syncs.end(), (flusher_sync_t){ .ready_count = 0, .state = 0 });
|
|
else
|
|
cur_sync--;
|
|
cur_sync->ready_count++;
|
|
if (cur_sync->ready_count >= flusher->sync_threshold ||
|
|
!flusher->active_until_sync && (!flusher->flush_queue.size() || flusher->active_flushers >= flusher->flusher_count))
|
|
{
|
|
// Sync batch is ready. Do it.
|
|
await_sqe(9);
|
|
data->callback = simple_callback_w;
|
|
data->iov = { 0 };
|
|
my_uring_prep_fsync(sqe, bs->data_fd, IORING_FSYNC_DATASYNC);
|
|
wait_count++;
|
|
if (bs->meta_fd != bs->data_fd)
|
|
{
|
|
await_sqe(10);
|
|
data->callback = simple_callback_w;
|
|
data->iov = { 0 };
|
|
my_uring_prep_fsync(sqe, bs->meta_fd, IORING_FSYNC_DATASYNC);
|
|
wait_count++;
|
|
}
|
|
resume_11:
|
|
if (wait_count > 0)
|
|
{
|
|
wait_state = 11;
|
|
return false;
|
|
}
|
|
// Sync completed. All previous coroutines waiting for it must be resumed
|
|
cur_sync->state = 1;
|
|
bs->ringloop->wakeup(bs->ring_consumer);
|
|
}
|
|
// Wait until someone else sends and completes a sync.
|
|
resume_8:
|
|
if (!cur_sync->state)
|
|
{
|
|
wait_state = 8;
|
|
return false;
|
|
}
|
|
cur_sync->ready_count--;
|
|
if (cur_sync->ready_count == 0)
|
|
{
|
|
flusher->syncs.erase(cur_sync);
|
|
}
|
|
}
|
|
return true;
|
|
}
|