ceph/src/os/bluestore/bluestore_common.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2014 Red Hat
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #ifndef CEPH_OSD_BLUESTORE_COMMON_H
  16 #define CEPH_OSD_BLUESTORE_COMMON_H
  17
  18 #include "include/intarith.h"
  19 #include "include/ceph_assert.h"
  20 #include "kv/KeyValueDB.h"
  21
  22 template <class Bitset, class Func>
  23 void apply_for_bitset_range(uint64_t off,
  24   uint64_t len,
  25   uint64_t granularity,
  26   Bitset &bitset,
  27   Func f) {
  28   auto end = round_up_to(off + len, granularity) / granularity;
  29   ceph_assert(end <= bitset.size());
  30   uint64_t pos = off / granularity;
  31   while (pos < end) {
  32     f(pos, bitset);
  33     pos++;
  34   }
  35 }
  36
  37 // merge operators
  38
  39 struct Int64ArrayMergeOperator : public KeyValueDB::MergeOperator {
  40   void merge_nonexistent(
  41     const char *rdata, size_t rlen, std::string *new_value) override {
  42     *new_value = std::string(rdata, rlen);
  43   }
  44   void merge(
  45     const char *ldata, size_t llen,
  46     const char *rdata, size_t rlen,
  47     std::string *new_value) override {
  48     ceph_assert(llen == rlen);
  49     ceph_assert((rlen % 8) == 0);
  50     new_value->resize(rlen);
  51     const ceph_le64* lv = (const ceph_le64*)ldata;
  52     const ceph_le64* rv = (const ceph_le64*)rdata;
  53     ceph_le64* nv = &(ceph_le64&)new_value->at(0);
  54     for (size_t i = 0; i < rlen >> 3; ++i) {
  55       nv[i] = lv[i] + rv[i];
  56     }
  57   }
  58   // We use each operator name and each prefix to construct the
  59   // overall RocksDB operator name for consistency check at open time.
  60   const char *name() const override {
  61     return "int64_array";
  62   }
  63 };
  64
  65 #endif