63 lines
2.5 KiB
C++
63 lines
2.5 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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#include <stdint.h>
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#include <string>
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#include <map>
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#define BLOCKSTORE_CSUM_NONE 0
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// Lower byte of checksum type is its length
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#define BLOCKSTORE_CSUM_CRC32C 0x104
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struct blockstore_disk_t
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{
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std::string data_device, meta_device, journal_device;
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uint32_t data_block_size;
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uint64_t cfg_journal_size, cfg_data_size;
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// Required write alignment and journal/metadata/data areas' location alignment
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uint32_t disk_alignment = 4096;
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// Journal block size - minimum_io_size of the journal device is the best choice
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uint64_t journal_block_size = 4096;
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// Metadata block size - minimum_io_size of the metadata device is the best choice
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uint64_t meta_block_size = 4096;
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// Sparse write tracking granularity. 4 KB is a good choice. Must be a multiple of disk_alignment
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uint64_t bitmap_granularity = 4096;
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// Data checksum type, BLOCKSTORE_CSUM_NONE or BLOCKSTORE_CSUM_CRC32C
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uint32_t data_csum_type = BLOCKSTORE_CSUM_NONE;
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// Checksum block size, must be a multiple of bitmap_granularity
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uint32_t csum_block_size = 4096;
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// By default, Blockstore locks all opened devices exclusively. This option can be used to disable locking
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bool disable_flock = false;
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// I/O modes for data, metadata and journal: direct or "" = O_DIRECT, cached = O_SYNC, directsync = O_DIRECT|O_SYNC
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// O_SYNC without O_DIRECT = use Linux page cache for reads and writes
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std::string data_io, meta_io, journal_io;
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int meta_fd = -1, data_fd = -1, journal_fd = -1;
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uint64_t meta_offset, meta_device_sect, meta_device_size, meta_len, meta_format = 0;
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uint64_t data_offset, data_device_sect, data_device_size, data_len;
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uint64_t journal_offset, journal_device_sect, journal_device_size, journal_len;
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uint32_t block_order;
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uint64_t block_count;
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uint32_t clean_entry_bitmap_size = 0, clean_entry_size = 0, clean_dyn_size = 0;
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void parse_config(std::map<std::string, std::string> & config);
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void open_data();
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void open_meta();
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void open_journal();
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void calc_lengths(bool skip_meta_check = false);
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void close_all();
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inline uint64_t dirty_dyn_size(uint64_t offset, uint64_t len)
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{
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// Checksums may be partial if write is not aligned with csum_block_size
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return clean_entry_bitmap_size + (csum_block_size && len > 0
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? ((offset+len+csum_block_size-1)/csum_block_size - offset/csum_block_size)
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* (data_csum_type & 0xFF)
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: 0);
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}
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};
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