Simplified distributed block storage with strong consistency, like in Ceph
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// Copyright (c) Vitaliy Filippov, 2019+
// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
#pragma once
#include "messenger.h"
#include "etcd_state_client.h"
#define MIN_BLOCK_SIZE 4*1024
#define MAX_BLOCK_SIZE 128*1024*1024
#define DEFAULT_CLIENT_MAX_DIRTY_BYTES 32*1024*1024
#define DEFAULT_CLIENT_MAX_DIRTY_OPS 1024
struct cluster_op_t;
struct cluster_op_part_t
{
cluster_op_t *parent;
uint64_t offset;
uint32_t len;
pg_num_t pg_num;
osd_num_t osd_num;
osd_op_buf_list_t iov;
unsigned flags;
osd_op_t op;
};
struct cluster_op_t
{
uint64_t opcode; // OSD_OP_READ, OSD_OP_WRITE, OSD_OP_SYNC
uint64_t inode;
uint64_t offset;
uint64_t len;
int retval;
osd_op_buf_list_t iov;
std::function<void(cluster_op_t*)> callback;
~cluster_op_t();
protected:
int flags = 0;
int state = 0;
uint64_t cur_inode; // for snapshot reads
void *buf = NULL;
cluster_op_t *orig_op = NULL;
bool needs_reslice = false;
bool up_wait = false;
int inflight_count = 0, done_count = 0;
std::vector<cluster_op_part_t> parts;
void *bitmap_buf = NULL, *part_bitmaps = NULL;
unsigned bitmap_buf_size = 0;
cluster_op_t *prev = NULL, *next = NULL;
friend class cluster_client_t;
};
struct cluster_buffer_t
{
void *buf;
uint64_t len;
int state;
};
// FIXME: Split into public and private interfaces
class cluster_client_t
{
timerfd_manager_t *tfd;
ring_loop_t *ringloop;
uint64_t bs_block_size = 0;
uint32_t bs_bitmap_granularity = 0, bs_bitmap_size = 0;
std::map<pool_id_t, uint64_t> pg_counts;
bool immediate_commit = false;
// FIXME: Implement inmemory_commit mode. Note that it requires to return overlapping reads from memory.
uint64_t client_max_dirty_bytes = 0;
uint64_t client_max_dirty_ops = 0;
int log_level;
int up_wait_retry_interval = 500; // ms
int retry_timeout_id = 0;
uint64_t op_id = 1;
std::vector<cluster_op_t*> offline_ops;
cluster_op_t *op_queue_head = NULL, *op_queue_tail = NULL;
std::map<object_id, cluster_buffer_t> dirty_buffers;
std::set<osd_num_t> dirty_osds;
uint64_t dirty_bytes = 0, dirty_ops = 0;
void *scrap_buffer = NULL;
unsigned scrap_buffer_size = 0;
bool pgs_loaded = false;
ring_consumer_t consumer;
std::vector<std::function<void(void)>> on_ready_hooks;
int continuing_ops = 0;
public:
etcd_state_client_t st_cli;
osd_messenger_t msgr;
json11::Json config;
cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config);
~cluster_client_t();
void execute(cluster_op_t *op);
bool is_ready();
void on_ready(std::function<void(void)> fn);
static void copy_write(cluster_op_t *op, std::map<object_id, cluster_buffer_t> & dirty_buffers);
void continue_ops(bool up_retry = false);
protected:
bool affects_osd(uint64_t inode, uint64_t offset, uint64_t len, osd_num_t osd);
void flush_buffer(const object_id & oid, cluster_buffer_t *wr);
void on_load_config_hook(json11::Json::object & config);
void on_load_pgs_hook(bool success);
void on_change_hook(std::map<std::string, etcd_kv_t> & changes);
void on_change_osd_state_hook(uint64_t peer_osd);
int continue_rw(cluster_op_t *op);
void slice_rw(cluster_op_t *op);
bool try_send(cluster_op_t *op, int i);
int continue_sync(cluster_op_t *op);
void send_sync(cluster_op_t *op, cluster_op_part_t *part);
void handle_op_part(cluster_op_part_t *part);
void copy_part_bitmap(cluster_op_t *op, cluster_op_part_t *part);
void erase_op(cluster_op_t *op);
};