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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) 2015 XSky <haomai@xsky.com>
*
* Author: Haomai Wang <haomaiwang@gmail.com>
*
* 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 CEPH_OS_BLUESTORE_BLOCKDEVICE_H
#define CEPH_OS_BLUESTORE_BLOCKDEVICE_H
#include <atomic>
#include <condition_variable>
#include <list>
#include <map>
#include <mutex>
#include <set>
#include <string>
#include <vector>
#include "acconfig.h"
#ifdef HAVE_LIBAIO
#include "aio.h"
#endif
#include "include/assert.h"
#include "include/buffer.h"
#define SPDK_PREFIX "spdk:"
class CephContext;
/// track in-flight io
struct IOContext {
private:
std::mutex lock;
std::condition_variable cond;
int r = 0;
public:
CephContext* cct;
void *priv;
#ifdef HAVE_SPDK
void *nvme_task_first = nullptr;
void *nvme_task_last = nullptr;
std::atomic_int total_nseg = {0};
#endif
#ifdef HAVE_LIBAIO
std::list<aio_t> pending_aios; ///< not yet submitted
std::list<aio_t> running_aios; ///< submitting or submitted
#endif
std::atomic_int num_pending = {0};
std::atomic_int num_running = {0};
bool allow_eio;
explicit IOContext(CephContext* cct, void *p, bool allow_eio = false)
: cct(cct), priv(p), allow_eio(allow_eio)
{}
// no copying
IOContext(const IOContext& other) = delete;
IOContext &operator=(const IOContext& other) = delete;
bool has_pending_aios() {
return num_pending.load();
}
void aio_wait();
void try_aio_wake() {
if (num_running == 1) {
// we might have some pending IOs submitted after the check
// as there is no lock protection for aio_submit.
// Hence we might have false conditional trigger.
// aio_wait has to handle that hence do not care here.
std::lock_guard<std::mutex> l(lock);
cond.notify_all();
--num_running;
assert(num_running >= 0);
} else {
--num_running;
}
}
void set_return_value(int _r) {
r = _r;
}
int get_return_value() const {
return r;
}
};
class BlockDevice {
public:
CephContext* cct;
typedef void (*aio_callback_t)(void *handle, void *aio);
private:
std::mutex ioc_reap_lock;
std::vector<IOContext*> ioc_reap_queue;
std::atomic_int ioc_reap_count = {0};
protected:
uint64_t size;
uint64_t block_size;
bool rotational = true;
public:
aio_callback_t aio_callback;
void *aio_callback_priv;
BlockDevice(CephContext* cct, aio_callback_t cb, void *cbpriv)
: cct(cct),
size(0),
block_size(0),
aio_callback(cb),
aio_callback_priv(cbpriv)
{}
virtual ~BlockDevice() = default;
static BlockDevice *create(
CephContext* cct, const std::string& path, aio_callback_t cb, void *cbpriv);
virtual bool supported_bdev_label() { return true; }
virtual bool is_rotational() { return rotational; }
virtual void aio_submit(IOContext *ioc) = 0;
uint64_t get_size() const { return size; }
uint64_t get_block_size() const { return block_size; }
virtual int collect_metadata(const std::string& prefix, std::map<std::string,std::string> *pm) const = 0;
virtual int get_devname(std::string *out) {
return -ENOENT;
}
virtual int get_devices(std::set<std::string> *ls) {
std::string s;
if (get_devname(&s) == 0) {
ls->insert(s);
}
return 0;
}
virtual int read(
uint64_t off,
uint64_t len,
bufferlist *pbl,
IOContext *ioc,
bool buffered) = 0;
virtual int read_random(
uint64_t off,
uint64_t len,
char *buf,
bool buffered) = 0;
virtual int write(
uint64_t off,
bufferlist& bl,
bool buffered) = 0;
virtual int aio_read(
uint64_t off,
uint64_t len,
bufferlist *pbl,
IOContext *ioc) = 0;
virtual int aio_write(
uint64_t off,
bufferlist& bl,
IOContext *ioc,
bool buffered) = 0;
virtual int flush() = 0;
void queue_reap_ioc(IOContext *ioc);
void reap_ioc();
// for managing buffered readers/writers
virtual int invalidate_cache(uint64_t off, uint64_t len) = 0;
virtual int open(const std::string& path) = 0;
virtual void close() = 0;
protected:
bool is_valid_io(uint64_t off, uint64_t len) const {
return (off % block_size == 0 &&
len % block_size == 0 &&
len > 0 &&
off < size &&
off + len <= size);
}
};
#endif //CEPH_OS_BLUESTORE_BLOCKDEVICE_H
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