ceph/src/librbd/cache/PassthroughImageCache.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 "PassthroughImageCache.h"
   5 #include "include/buffer.h"
   6 #include "common/dout.h"
   7 #include "librbd/ImageCtx.h"
   8
   9 #define dout_subsys ceph_subsys_rbd
  10 #undef dout_prefix
  11 #define dout_prefix *_dout << "librbd::PassthroughImageCache: " << this << " " \
  12                            <<  __func__ << ": "
  13
  14 namespace librbd {
  15 namespace cache {
  16
  17 template <typename I>
  18 PassthroughImageCache<I>::PassthroughImageCache(ImageCtx &image_ctx)
  19   : m_image_ctx(image_ctx), m_image_writeback(image_ctx) {
  20 }
  21
  22 template <typename I>
  23 void PassthroughImageCache<I>::aio_read(Extents &&image_extents, bufferlist *bl,
  24                                         int fadvise_flags, Context *on_finish) {
  25   CephContext *cct = m_image_ctx.cct;
  26   ldout(cct, 20) << "image_extents=" << image_extents << ", "
  27                  << "on_finish=" << on_finish << dendl;
  28
  29   m_image_writeback.aio_read(std::move(image_extents), bl, fadvise_flags,
  30                              on_finish);
  31 }
  32
  33 template <typename I>
  34 void PassthroughImageCache<I>::aio_write(Extents &&image_extents,
  35                                          bufferlist&& bl,
  36                                          int fadvise_flags,
  37                                          Context *on_finish) {
  38   CephContext *cct = m_image_ctx.cct;
  39   ldout(cct, 20) << "image_extents=" << image_extents << ", "
  40                  << "on_finish=" << on_finish << dendl;
  41
  42   m_image_writeback.aio_write(std::move(image_extents), std::move(bl),
  43                               fadvise_flags, on_finish);
  44 }
  45
  46 template <typename I>
  47 void PassthroughImageCache<I>::aio_discard(uint64_t offset, uint64_t length,
  48                                            bool skip_partial_discard, Context *on_finish) {
  49   CephContext *cct = m_image_ctx.cct;
  50   ldout(cct, 20) << "offset=" << offset << ", "
  51                  << "length=" << length << ", "
  52                  << "on_finish=" << on_finish << dendl;
  53
  54   m_image_writeback.aio_discard(offset, length, skip_partial_discard, on_finish);
  55 }
  56
  57 template <typename I>
  58 void PassthroughImageCache<I>::aio_flush(Context *on_finish) {
  59   CephContext *cct = m_image_ctx.cct;
  60   ldout(cct, 20) << "on_finish=" << on_finish << dendl;
  61
  62   m_image_writeback.aio_flush(on_finish);
  63 }
  64
  65 template <typename I>
  66 void PassthroughImageCache<I>::aio_writesame(uint64_t offset, uint64_t length,
  67                                              bufferlist&& bl, int fadvise_flags,
  68                                              Context *on_finish) {
  69   CephContext *cct = m_image_ctx.cct;
  70   ldout(cct, 20) << "offset=" << offset << ", "
  71                  << "length=" << length << ", "
  72                  << "data_len=" << bl.length() << ", "
  73                  << "on_finish=" << on_finish << dendl;
  74
  75   m_image_writeback.aio_writesame(offset, length, std::move(bl), fadvise_flags,
  76                                   on_finish);
  77 }
  78
  79 template <typename I>
  80 void PassthroughImageCache<I>::init(Context *on_finish) {
  81   CephContext *cct = m_image_ctx.cct;
  82   ldout(cct, 20) << dendl;
  83
  84   on_finish->complete(0);
  85 }
  86
  87 template <typename I>
  88 void PassthroughImageCache<I>::shut_down(Context *on_finish) {
  89   CephContext *cct = m_image_ctx.cct;
  90   ldout(cct, 20) << dendl;
  91
  92   on_finish->complete(0);
  93 }
  94
  95 template <typename I>
  96 void PassthroughImageCache<I>::invalidate(Context *on_finish) {
  97   CephContext *cct = m_image_ctx.cct;
  98   ldout(cct, 20) << dendl;
  99
 100   // dump cache contents (don't have anything)
 101   on_finish->complete(0);
 102 }
 103
 104 template <typename I>
 105 void PassthroughImageCache<I>::flush(Context *on_finish) {
 106   CephContext *cct = m_image_ctx.cct;
 107   ldout(cct, 20) << dendl;
 108
 109   // internal flush -- nothing to writeback but make sure
 110   // in-flight IO is flushed
 111   aio_flush(on_finish);
 112 }
 113
 114 } // namespace cache
 115 } // namespace librbd
 116
 117 template class librbd::cache::PassthroughImageCache<librbd::ImageCtx>;