ceph/src/common/buffer_seastar.cc

   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) 2017 Red Hat, Inc.
   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 #include <seastar/core/sharded.hh>
  16 #include <seastar/net/packet.hh>
  17
  18 #include "include/buffer_raw.h"
  19 #include "buffer_seastar.h"
  20
  21 using temporary_buffer = seastar::temporary_buffer<char>;
  22
  23 namespace ceph::buffer {
  24
  25 class raw_seastar_foreign_ptr : public raw {
  26   seastar::foreign_ptr<temporary_buffer> ptr;
  27  public:
  28   raw_seastar_foreign_ptr(temporary_buffer&& buf)
  29     : raw(buf.get_write(), buf.size()), ptr(std::move(buf)) {}
  30 };
  31
  32 class raw_seastar_local_ptr : public raw {
  33   temporary_buffer buf;
  34  public:
  35   raw_seastar_local_ptr(temporary_buffer&& buf)
  36     : raw(buf.get_write(), buf.size()), buf(std::move(buf)) {}
  37 };
  38
  39 inline namespace v15_2_0 {
  40
  41 ceph::unique_leakable_ptr<buffer::raw> create(temporary_buffer&& buf) {
  42   return ceph::unique_leakable_ptr<buffer::raw>(
  43     new raw_seastar_foreign_ptr(std::move(buf)));
  44 }
  45
  46 ceph::unique_leakable_ptr<buffer::raw> create_local(temporary_buffer&& buf) {
  47   return ceph::unique_leakable_ptr<buffer::raw>(
  48     new raw_seastar_local_ptr(std::move(buf)));
  49 }
  50
  51 } // inline namespace v15_2_0
  52
  53 // buffer::ptr conversions
  54
  55 ptr::operator seastar::temporary_buffer<char>() &
  56 {
  57   return {c_str(), _len, seastar::make_object_deleter(*this)};
  58 }
  59
  60 ptr::operator seastar::temporary_buffer<char>() &&
  61 {
  62   auto data = c_str();
  63   auto length = _len;
  64   return {data, length, seastar::make_object_deleter(std::move(*this))};
  65 }
  66
  67 // buffer::list conversions
  68
  69 list::operator seastar::net::packet() &&
  70 {
  71   seastar::net::packet p(_num);
  72   for (auto& ptr : _buffers) {
  73     // append each ptr as a temporary_buffer
  74     p = seastar::net::packet(std::move(p), std::move(ptr));
  75   }
  76   clear();
  77   return p;
  78 }
  79
  80 } // namespace ceph::buffer
  81
  82 namespace {
  83
  84 using ceph::buffer::raw;
  85 class raw_seastar_local_shared_ptr : public raw {
  86   temporary_buffer buf;
  87 public:
  88   raw_seastar_local_shared_ptr(temporary_buffer& buf)
  89     : raw(buf.get_write(), buf.size()), buf(buf.share()) {}
  90 };
  91 }
  92
  93 buffer::ptr seastar_buffer_iterator::get_ptr(size_t len)
  94 {
  95   buffer::ptr p{ceph::unique_leakable_ptr<buffer::raw>(
  96     new raw_seastar_local_shared_ptr{buf})};
  97   p.set_length(len);
  98   return p;
  99 }
 100
 101 buffer::ptr const_seastar_buffer_iterator::get_ptr(size_t len)
 102 {
 103   return buffer::ptr{ buffer::copy(get_pos_add(len), len) };
 104 }