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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.
*
*/
#include <libgen.h>
#include <unistd.h>
#include "BlockDevice.h"
#if defined(HAVE_LIBAIO) || defined(HAVE_POSIXAIO)
#include "KernelDevice.h"
#endif
#if defined(HAVE_SPDK)
#include "NVMEDevice.h"
#endif
#if defined(HAVE_PMEM)
#include "PMEMDevice.h"
#include "libpmem.h"
#endif
#include "common/debug.h"
#include "common/EventTrace.h"
#include "common/errno.h"
#include "include/compat.h"
#define dout_context cct
#define dout_subsys ceph_subsys_bdev
#undef dout_prefix
#define dout_prefix *_dout << "bdev "
void IOContext::aio_wait()
{
std::unique_lock l(lock);
// see _aio_thread for waker logic
while (num_running.load() > 0) {
dout(10) << __func__ << " " << this
<< " waiting for " << num_running.load() << " aios to complete"
<< dendl;
cond.wait(l);
}
dout(20) << __func__ << " " << this << " done" << dendl;
}
uint64_t IOContext::get_num_ios() const
{
// this is about the simplest model for transaction cost you can
// imagine. there is some fixed overhead cost by saying there is a
// minimum of one "io". and then we have some cost per "io" that is
// a configurable (with different hdd and ssd defaults), and add
// that to the bytes value.
uint64_t ios = 0;
#if defined(HAVE_LIBAIO) || defined(HAVE_POSIXAIO)
ios += pending_aios.size();
#endif
#ifdef HAVE_SPDK
ios += total_nseg;
#endif
return ios;
}
void IOContext::release_running_aios()
{
ceph_assert(!num_running);
#if defined(HAVE_LIBAIO) || defined(HAVE_POSIXAIO)
// release aio contexts (including pinned buffers).
running_aios.clear();
#endif
}
BlockDevice *BlockDevice::create(CephContext* cct, const string& path,
aio_callback_t cb, void *cbpriv, aio_callback_t d_cb, void *d_cbpriv)
{
string type = "kernel";
char buf[PATH_MAX + 1];
int r = ::readlink(path.c_str(), buf, sizeof(buf) - 1);
if (r >= 0) {
buf[r] = '\0';
char *bname = ::basename(buf);
if (strncmp(bname, SPDK_PREFIX, sizeof(SPDK_PREFIX)-1) == 0)
type = "ust-nvme";
}
#if defined(HAVE_PMEM)
if (type == "kernel") {
int is_pmem = 0;
size_t map_len = 0;
void *addr = pmem_map_file(path.c_str(), 0, PMEM_FILE_EXCL, O_RDONLY, &map_len, &is_pmem);
if (addr != NULL) {
if (is_pmem)
type = "pmem";
else
dout(1) << path.c_str() << " isn't pmem file" << dendl;
pmem_unmap(addr, map_len);
} else {
dout(1) << "pmem_map_file:" << path.c_str() << " failed." << pmem_errormsg() << dendl;
}
}
#endif
dout(1) << __func__ << " path " << path << " type " << type << dendl;
#if defined(HAVE_PMEM)
if (type == "pmem") {
return new PMEMDevice(cct, cb, cbpriv);
}
#endif
#if defined(HAVE_LIBAIO) || defined(HAVE_POSIXAIO)
if (type == "kernel") {
return new KernelDevice(cct, cb, cbpriv, d_cb, d_cbpriv);
}
#endif
#if defined(HAVE_SPDK)
if (type == "ust-nvme") {
return new NVMEDevice(cct, cb, cbpriv);
}
#endif
derr << __func__ << " unknown backend " << type << dendl;
ceph_abort();
return NULL;
}
void BlockDevice::queue_reap_ioc(IOContext *ioc)
{
std::lock_guard l(ioc_reap_lock);
if (ioc_reap_count.load() == 0)
++ioc_reap_count;
ioc_reap_queue.push_back(ioc);
}
void BlockDevice::reap_ioc()
{
if (ioc_reap_count.load()) {
std::lock_guard l(ioc_reap_lock);
for (auto p : ioc_reap_queue) {
dout(20) << __func__ << " reap ioc " << p << dendl;
delete p;
}
ioc_reap_queue.clear();
--ioc_reap_count;
}
}
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