forked from vitalif/vitastor
103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
#pragma once
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#ifndef _LARGEFILE64_SOURCE
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#define _LARGEFILE64_SOURCE
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#endif
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#include <stdint.h>
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#include <map>
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#include <unordered_map>
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#include <functional>
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#include "object_id.h"
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#include "ringloop.h"
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// Default block size is 128 KB, current allowed range is 4K - 128M
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#define DEFAULT_ORDER 17
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#define MIN_BLOCK_SIZE 4*1024
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#define MAX_BLOCK_SIZE 128*1024*1024
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#define BS_OP_MIN 1
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#define BS_OP_READ 1
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#define BS_OP_WRITE 2
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#define BS_OP_SYNC 3
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#define BS_OP_STABLE 4
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#define BS_OP_DELETE 5
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#define BS_OP_LIST 6
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#define BS_OP_MAX 6
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#define BS_OP_TYPE_MASK 0x7
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#define BS_OP_PRIVATE_DATA_SIZE 256
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/* BS_OP_LIST:
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Input:
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- len = divisor
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- offset = modulo. object is listed if (object_id % len) == offset.
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Output:
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- retval = total obj_ver_id count
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- version = stable obj_ver_id count
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- buf = obj_ver_id array allocated by the blockstore. stable versions come first
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*/
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struct blockstore_op_t
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{
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// operation
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uint64_t opcode;
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// finish callback
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std::function<void (blockstore_op_t*)> callback;
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// For reads, writes & deletes: oid is the requested object
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object_id oid;
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// For reads: version=0 -> last stable, version=UINT64_MAX -> last unstable, version=X -> specific version
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// For writes & deletes: a new version is assigned automatically
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uint64_t version;
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// For reads & writes: offset & len are the requested part of the object, buf is the buffer
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uint32_t offset;
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// For stabilize requests: buf contains <len> obj_ver_id's to stabilize
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uint32_t len;
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void *buf;
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int retval;
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uint8_t private_data[BS_OP_PRIVATE_DATA_SIZE];
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};
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typedef std::unordered_map<std::string, std::string> blockstore_config_t;
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class blockstore_impl_t;
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class blockstore_t
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{
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blockstore_impl_t *impl;
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public:
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blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop);
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~blockstore_t();
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// Event loop
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void loop();
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// Returns true when blockstore is ready to process operations
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// (Although you're free to enqueue them before that)
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bool is_started();
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// Returns true when blockstore is stalled
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bool is_stalled();
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// Returns true when it's safe to destroy the instance. If destroying the instance
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// requires to purge some queues, starts that process. Should be called in the event
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// loop until it returns true.
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bool is_safe_to_stop();
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// Submission
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void enqueue_op(blockstore_op_t *op);
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// Unstable writes are added here (map of object_id -> version)
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std::map<object_id, uint64_t> & get_unstable_writes();
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uint32_t get_block_size();
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uint32_t get_block_order();
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uint64_t get_block_count();
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};
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