116 lines
2.9 KiB
C++
116 lines
2.9 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 (see README.md for details)
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struct copy_buffer_t
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{
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uint64_t offset, len;
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void *buf;
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};
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struct meta_sector_t
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{
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uint64_t offset, len;
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int state;
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void *buf;
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int usage_count;
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};
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struct flusher_sync_t
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{
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bool fsync_meta;
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int ready_count;
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int state;
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};
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struct flusher_meta_write_t
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{
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uint64_t sector, pos;
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bool submitted;
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void *buf;
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std::map<uint64_t, meta_sector_t>::iterator it;
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};
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class journal_flusher_t;
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// Journal flusher coroutine
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class journal_flusher_co
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{
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blockstore_impl_t *bs;
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journal_flusher_t *flusher;
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int wait_state, wait_count;
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struct io_uring_sqe *sqe;
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struct ring_data_t *data;
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std::list<flusher_sync_t>::iterator cur_sync;
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obj_ver_id cur;
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std::map<obj_ver_id, dirty_entry>::iterator dirty_it, dirty_start, dirty_end;
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std::map<object_id, uint64_t>::iterator repeat_it;
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std::function<void(ring_data_t*)> simple_callback_r, simple_callback_w;
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bool skip_copy, has_delete, has_writes;
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blockstore_clean_db_t::iterator clean_it;
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std::vector<copy_buffer_t> v;
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std::vector<copy_buffer_t>::iterator it;
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int copy_count;
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uint64_t clean_loc, old_clean_loc;
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flusher_meta_write_t meta_old, meta_new;
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bool clean_init_bitmap;
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uint64_t clean_bitmap_offset, clean_bitmap_len;
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void *new_clean_bitmap;
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uint64_t new_trim_pos;
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// local: scan_dirty()
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uint64_t offset, end_offset, submit_offset, submit_len;
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friend class journal_flusher_t;
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bool scan_dirty(int wait_base);
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bool modify_meta_read(uint64_t meta_loc, flusher_meta_write_t &wr, int wait_base);
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void update_clean_db();
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bool fsync_batch(bool fsync_meta, int wait_base);
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public:
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journal_flusher_co();
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bool loop();
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};
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// Journal flusher itself
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class journal_flusher_t
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{
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int trim_wanted = 0;
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bool dequeuing;
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int min_flusher_count, max_flusher_count, cur_flusher_count, target_flusher_count;
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int flusher_start_threshold;
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journal_flusher_co *co;
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blockstore_impl_t *bs;
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friend class journal_flusher_co;
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int journal_trim_counter, journal_trim_interval;
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bool trimming;
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void* journal_superblock;
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int active_flushers;
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int syncing_flushers;
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std::list<flusher_sync_t> syncs;
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std::map<object_id, uint64_t> sync_to_repeat;
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std::map<uint64_t, meta_sector_t> meta_sectors;
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std::deque<object_id> flush_queue;
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std::map<object_id, uint64_t> flush_versions;
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bool try_find_older(std::map<obj_ver_id, dirty_entry>::iterator & dirty_end, obj_ver_id & cur);
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public:
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journal_flusher_t(blockstore_impl_t *bs);
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~journal_flusher_t();
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void loop();
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bool is_active();
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void mark_trim_possible();
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void request_trim();
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void release_trim();
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void enqueue_flush(obj_ver_id oid);
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void unshift_flush(obj_ver_id oid, bool force);
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void remove_flush(object_id oid);
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void dump_diagnostics();
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};
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