Simplified distributed block storage with strong consistency, like in Ceph
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struct copy_buffer_t
{
uint64_t offset, len;
void *buf;
};
struct meta_sector_t
{
uint64_t offset, len;
int state;
void *buf;
int usage_count;
};
class journal_flusher_t;
// Journal flusher coroutine
struct journal_flusher_co
{
blockstore *bs;
journal_flusher_t *flusher;
int wait_state, wait_count;
struct io_uring_sqe *sqe;
struct ring_data_t *data;
bool skip_copy;
obj_ver_id cur;
std::map<obj_ver_id, dirty_entry>::iterator dirty_it;
std::vector<copy_buffer_t> v;
std::vector<copy_buffer_t>::iterator it;
uint64_t offset, len, submit_len, clean_loc, meta_sector, meta_pos;
std::map<uint64_t, meta_sector_t>::iterator meta_it;
friend class journal_flusher_t;
public:
void loop();
};
// Journal flusher itself
class journal_flusher_t
{
int flusher_count;
int active_flushers;
journal_flusher_co *co;
blockstore *bs;
friend class journal_flusher_co;
public:
std::map<uint64_t, meta_sector_t> meta_sectors;
std::deque<obj_ver_id> flush_queue;
journal_flusher_t(int flusher_count, blockstore *bs);
~journal_flusher_t();
void loop();
};