ceph/src/librbd/cache/ImageWriteback.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 "ImageWriteback.h"
   5 #include "include/buffer.h"
   6 #include "common/dout.h"
   7 #include "librbd/ImageCtx.h"
   8 #include "librbd/io/AioCompletion.h"
   9 #include "librbd/io/ImageRequest.h"
  10 #include "librbd/io/ReadResult.h"
  11
  12 #define dout_subsys ceph_subsys_rbd
  13 #undef dout_prefix
  14 #define dout_prefix *_dout << "librbd::ImageWriteback: " << __func__ << ": "
  15
  16 namespace librbd {
  17 namespace cache {
  18
  19 template <typename I>
  20 ImageWriteback<I>::ImageWriteback(I &image_ctx) : m_image_ctx(image_ctx) {
  21 }
  22
  23 template <typename I>
  24 void ImageWriteback<I>::aio_read(Extents &&image_extents, bufferlist *bl,
  25                                  int fadvise_flags, Context *on_finish) {
  26   CephContext *cct = m_image_ctx.cct;
  27   ldout(cct, 20) << "image_extents=" << image_extents << ", "
  28                  << "on_finish=" << on_finish << dendl;
  29
  30   auto aio_comp = io::AioCompletion::create_and_start(on_finish, &m_image_ctx,
  31                                                       io::AIO_TYPE_READ);
  32   io::ImageReadRequest<I> req(m_image_ctx, aio_comp, std::move(image_extents),
  33                               io::ReadResult{bl}, fadvise_flags, {});
  34   req.set_bypass_image_cache();
  35   req.send();
  36 }
  37
  38 template <typename I>
  39 void ImageWriteback<I>::aio_write(Extents &&image_extents,
  40                                   ceph::bufferlist&& bl,
  41                                   int fadvise_flags, Context *on_finish) {
  42   CephContext *cct = m_image_ctx.cct;
  43   ldout(cct, 20) << "image_extents=" << image_extents << ", "
  44                  << "on_finish=" << on_finish << dendl;
  45
  46   auto aio_comp = io::AioCompletion::create_and_start(on_finish, &m_image_ctx,
  47                                                       io::AIO_TYPE_WRITE);
  48   io::ImageWriteRequest<I> req(m_image_ctx, aio_comp, std::move(image_extents),
  49                                std::move(bl), fadvise_flags, {});
  50   req.set_bypass_image_cache();
  51   req.send();
  52 }
  53
  54 template <typename I>
  55 void ImageWriteback<I>::aio_discard(uint64_t offset, uint64_t length,
  56                                     bool skip_partial_discard,
  57                                     Context *on_finish) {
  58   CephContext *cct = m_image_ctx.cct;
  59   ldout(cct, 20) << "offset=" << offset << ", "
  60                  << "length=" << length << ", "
  61                 << "on_finish=" << on_finish << dendl;
  62
  63   auto aio_comp = io::AioCompletion::create_and_start(on_finish, &m_image_ctx,
  64                                                       io::AIO_TYPE_DISCARD);
  65   io::ImageDiscardRequest<I> req(m_image_ctx, aio_comp, offset, length,
  66                                  skip_partial_discard, {});
  67   req.set_bypass_image_cache();
  68   req.send();
  69 }
  70
  71 template <typename I>
  72 void ImageWriteback<I>::aio_flush(Context *on_finish) {
  73   CephContext *cct = m_image_ctx.cct;
  74   ldout(cct, 20) << "on_finish=" << on_finish << dendl;
  75
  76   auto aio_comp = io::AioCompletion::create_and_start(on_finish, &m_image_ctx,
  77                                                       io::AIO_TYPE_FLUSH);
  78   io::ImageFlushRequest<I> req(m_image_ctx, aio_comp, {});
  79   req.set_bypass_image_cache();
  80   req.send();
  81 }
  82
  83 template <typename I>
  84 void ImageWriteback<I>::aio_writesame(uint64_t offset, uint64_t length,
  85                                       ceph::bufferlist&& bl,
  86                                       int fadvise_flags, Context *on_finish) {
  87   CephContext *cct = m_image_ctx.cct;
  88   ldout(cct, 20) << "offset=" << offset << ", "
  89                  << "length=" << length << ", "
  90                  << "data_len=" << bl.length() << ", "
  91                  << "on_finish=" << on_finish << dendl;
  92
  93   auto aio_comp = io::AioCompletion::create_and_start(on_finish, &m_image_ctx,
  94                                                       io::AIO_TYPE_WRITESAME);
  95   io::ImageWriteSameRequest<I> req(m_image_ctx, aio_comp, offset, length,
  96                                    std::move(bl), fadvise_flags, {});
  97   req.set_bypass_image_cache();
  98   req.send();
  99 }
 100
 101 } // namespace cache
 102 } // namespace librbd
 103
 104 template class librbd::cache::ImageWriteback<librbd::ImageCtx>;
 105