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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2021 Red Hat, Inc.
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License version 2.1, as published by
* the Free Software Foundation. See file COPYING.
*
*/
#ifndef _SIMPLERADOSSTRIPER_H
#define _SIMPLERADOSSTRIPER_H
#include <queue>
#include <string_view>
#include <thread>
#include "include/buffer.h"
#include "include/rados/librados.hpp"
#include "include/uuid.h"
#include "include/types.h"
#include "common/ceph_time.h"
#include "common/perf_counters.h"
class [[gnu::visibility("default")]] SimpleRADOSStriper
{
public:
using aiocompletionptr = std::unique_ptr<librados::AioCompletion>;
using clock = ceph::coarse_mono_clock;
using time = ceph::coarse_mono_time;
static inline const uint64_t object_size = 22; /* power of 2 */
static inline const uint64_t min_growth = (1<<27); /* 128 MB */
static int config_logger(CephContext* cct, std::string_view name, std::shared_ptr<PerfCounters>* l);
SimpleRADOSStriper() = default;
SimpleRADOSStriper(librados::IoCtx _ioctx, std::string _oid)
: ioctx(std::move(_ioctx))
, oid(std::move(_oid))
{
cookie.generate_random();
auto r = librados::Rados(ioctx);
myaddrs = r.get_addrs();
}
SimpleRADOSStriper(const SimpleRADOSStriper&) = delete;
SimpleRADOSStriper& operator=(const SimpleRADOSStriper&) = delete;
SimpleRADOSStriper& operator=(SimpleRADOSStriper&&) = delete;
SimpleRADOSStriper(SimpleRADOSStriper&&) = delete;
~SimpleRADOSStriper();
int create();
int open();
int remove();
int stat(uint64_t* size);
ssize_t write(const void* data, size_t len, uint64_t off);
ssize_t read(void* data, size_t len, uint64_t off);
int truncate(size_t size);
int flush();
int lock(uint64_t timeoutms);
int unlock();
int is_locked() const {
return locked;
}
int print_lockers(std::ostream& out);
void set_logger(std::shared_ptr<PerfCounters> l) {
logger = std::move(l);
}
void set_lock_interval(std::chrono::milliseconds t) {
lock_keeper_interval = t;
}
void set_lock_timeout(std::chrono::milliseconds t) {
lock_keeper_timeout = t;
}
void set_blocklist_the_dead(bool b) {
blocklist_the_dead = b;
}
protected:
struct extent {
std::string soid;
size_t len;
size_t off;
};
ceph::bufferlist str2bl(std::string_view sv);
ceph::bufferlist uint2bl(uint64_t v);
int set_metadata(uint64_t new_size, bool update_size);
int shrink_alloc(uint64_t a);
int maybe_shrink_alloc();
int wait_for_aios(bool block);
int recover_lock();
extent get_next_extent(uint64_t off, size_t len) const;
extent get_first_extent() const {
return get_next_extent(0, 0);
}
private:
static inline const char XATTR_EXCL[] = "striper.excl";
static inline const char XATTR_SIZE[] = "striper.size";
static inline const char XATTR_ALLOCATED[] = "striper.allocated";
static inline const char XATTR_VERSION[] = "striper.version";
static inline const char XATTR_LAYOUT_STRIPE_UNIT[] = "striper.layout.stripe_unit";
static inline const char XATTR_LAYOUT_STRIPE_COUNT[] = "striper.layout.stripe_count";
static inline const char XATTR_LAYOUT_OBJECT_SIZE[] = "striper.layout.object_size";
static inline const std::string biglock = "striper.lock";
static inline const std::string lockdesc = "SimpleRADOSStriper";
void lock_keeper_main();
librados::IoCtx ioctx;
std::shared_ptr<PerfCounters> logger;
std::string oid;
std::thread lock_keeper;
std::condition_variable lock_keeper_cvar;
std::mutex lock_keeper_mutex;
time last_renewal = time::min();
std::chrono::milliseconds lock_keeper_interval = 2000ms;
std::chrono::milliseconds lock_keeper_timeout = 30000ms;
std::atomic<bool> blocklisted = false;
bool shutdown = false;
version_t version = 0;
std::string exclusive_holder;
uint64_t size = 0;
uint64_t allocated = 0;
uuid_d cookie{};
bool locked = false;
bool size_dirty = false;
bool blocklist_the_dead = true;
std::queue<aiocompletionptr> aios;
int aios_failure = 0;
std::string myaddrs;
};
#endif /* _SIMPLERADOSSTRIPER_H */
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