79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 (see README.md for details)
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#pragma once
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class blockstore_impl_t;
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struct journal_sector_info_t
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{
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uint64_t offset;
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uint64_t flush_count;
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bool written;
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bool dirty;
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uint64_t submit_id;
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};
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struct pending_journaling_t
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{
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int pending;
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int sector;
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blockstore_op_t *op;
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};
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struct journal_t
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{
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int fd;
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bool inmemory = false;
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bool flush_journal = false;
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void *buffer = NULL;
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uint64_t block_size;
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uint64_t offset, len;
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// Next free block offset
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uint64_t next_free = 0;
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// First occupied block offset
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uint64_t used_start = 0;
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// End of the last block not used for writing anymore
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uint64_t dirty_start = 0;
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uint32_t crc32_last = 0;
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// Current sector(s) used for writing
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void *sector_buf = NULL;
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journal_sector_info_t *sector_info = NULL;
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uint64_t sector_count;
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bool no_same_sector_overwrites = false;
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int cur_sector = 0;
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int in_sector_pos = 0;
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std::vector<int> submitting_sectors;
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std::multimap<uint64_t, pending_journaling_t> flushing_ops;
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uint64_t submit_id = 0;
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// Used sector map
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// May use ~ 80 MB per 1 GB of used journal space in the worst case
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std::map<uint64_t, uint64_t> used_sectors;
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~journal_t();
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bool trim();
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uint64_t get_trim_pos();
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void dump_diagnostics();
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inline bool entry_fits(int size)
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{
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return !(block_size - in_sector_pos < size ||
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no_same_sector_overwrites && sector_info[cur_sector].written);
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}
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};
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struct blockstore_journal_check_t
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{
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blockstore_impl_t *bs;
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uint64_t next_pos, next_sector, next_in_pos;
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int sectors_to_write, first_sector;
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bool right_dir; // writing to the end or the beginning of the ring buffer
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blockstore_journal_check_t(blockstore_impl_t *bs);
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int check_available(blockstore_op_t *op, int required, int size, int data_after);
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};
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journal_entry* prefill_single_journal_entry(journal_t & journal, uint16_t type, uint32_t size);
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