ceph/src/os/bluestore/FreelistManager.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "FreelistManager.h"
   5 #include "BitmapFreelistManager.h"
   6 #ifdef HAVE_LIBZBD
   7 #include "ZonedFreelistManager.h"
   8 #endif
   9
  10 FreelistManager *FreelistManager::create(
  11   CephContext* cct,
  12   std::string type,
  13   std::string prefix)
  14 {
  15   // a bit of a hack... we hard-code the prefixes here.  we need to
  16   // put the freelistmanagers in different prefixes because the merge
  17   // op is per prefix, has to done pre-db-open, and we don't know the
  18   // freelist type until after we open the db.
  19   ceph_assert(prefix == "B");
  20   if (type == "bitmap") {
  21     return new BitmapFreelistManager(cct, "B", "b");
  22   }
  23   if (type == "null") {
  24     // use BitmapFreelistManager with the null option to stop allocations from going to RocksDB
  25     auto *fm = new BitmapFreelistManager(cct, "B", "b");
  26     fm->set_null_manager();
  27     return fm;
  28   }
  29
  30 #ifdef HAVE_LIBZBD
  31   // With zoned drives there is only one FreelistManager implementation that we
  32   // can use, and we also know if a drive is zoned right after opening it
  33   // (BlueStore::_open_bdev).  Hence, we set freelist_type to "zoned" whenever
  34   // we open the device and it turns out to be is zoned.  We ignore |prefix|
  35   // passed to create and use the prefixes defined for zoned devices at the top
  36   // of BlueStore.cc.
  37   if (type == "zoned")
  38     return new ZonedFreelistManager(cct, "Z", "z");
  39 #endif
  40
  41   return NULL;
  42 }
  43
  44 void FreelistManager::setup_merge_operators(KeyValueDB *db,
  45                                             const std::string& type)
  46 {
  47 #ifdef HAVE_LIBZBD
  48   if (type == "zoned")
  49     ZonedFreelistManager::setup_merge_operator(db, "z");
  50   else
  51 #endif
  52     BitmapFreelistManager::setup_merge_operator(db, "b");
  53 }