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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "FreelistManager.h"
#include "BitmapFreelistManager.h"
#ifdef HAVE_LIBZBD
#include "ZonedFreelistManager.h"
#endif
FreelistManager *FreelistManager::create(
CephContext* cct,
std::string type,
std::string prefix)
{
// a bit of a hack... we hard-code the prefixes here. we need to
// put the freelistmanagers in different prefixes because the merge
// op is per prefix, has to done pre-db-open, and we don't know the
// freelist type until after we open the db.
ceph_assert(prefix == "B");
if (type == "bitmap") {
return new BitmapFreelistManager(cct, "B", "b");
}
if (type == "null") {
// use BitmapFreelistManager with the null option to stop allocations from going to RocksDB
auto *fm = new BitmapFreelistManager(cct, "B", "b");
fm->set_null_manager();
return fm;
}
#ifdef HAVE_LIBZBD
// With zoned drives there is only one FreelistManager implementation that we
// can use, and we also know if a drive is zoned right after opening it
// (BlueStore::_open_bdev). Hence, we set freelist_type to "zoned" whenever
// we open the device and it turns out to be is zoned. We ignore |prefix|
// passed to create and use the prefixes defined for zoned devices at the top
// of BlueStore.cc.
if (type == "zoned")
return new ZonedFreelistManager(cct, "Z", "z");
#endif
return NULL;
}
void FreelistManager::setup_merge_operators(KeyValueDB *db,
const std::string& type)
{
#ifdef HAVE_LIBZBD
if (type == "zoned")
ZonedFreelistManager::setup_merge_operator(db, "z");
else
#endif
BitmapFreelistManager::setup_merge_operator(db, "b");
}
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