// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab

#include "PassthroughImageCache.h"
#include "include/buffer.h"
#include "common/dout.h"
#include "librbd/ImageCtx.h"

#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::PassthroughImageCache: " << this << " " \
                           <<  __func__ << ": "

namespace librbd {
namespace cache {

template <typename I>
PassthroughImageCache<I>::PassthroughImageCache(ImageCtx &image_ctx)
  : m_image_ctx(image_ctx), m_image_writeback(image_ctx) {
}

template <typename I>
void PassthroughImageCache<I>::aio_read(Extents &&image_extents, bufferlist *bl,
                                        int fadvise_flags, Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "image_extents=" << image_extents << ", "
                 << "on_finish=" << on_finish << dendl;

  m_image_writeback.aio_read(std::move(image_extents), bl, fadvise_flags,
                             on_finish);
}

template <typename I>
void PassthroughImageCache<I>::aio_write(Extents &&image_extents,
                                         bufferlist&& bl,
                                         int fadvise_flags,
                                         Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "image_extents=" << image_extents << ", "
                 << "on_finish=" << on_finish << dendl;

  m_image_writeback.aio_write(std::move(image_extents), std::move(bl),
                              fadvise_flags, on_finish);
}

template <typename I>
void PassthroughImageCache<I>::aio_discard(uint64_t offset, uint64_t length,
                                           uint32_t discard_granularity_bytes,
                                           Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "offset=" << offset << ", "
                 << "length=" << length << ", "
                 << "on_finish=" << on_finish << dendl;

  m_image_writeback.aio_discard(offset, length, discard_granularity_bytes,
                                on_finish);
}

template <typename I>
void PassthroughImageCache<I>::aio_flush(Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "on_finish=" << on_finish << dendl;

  m_image_writeback.aio_flush(on_finish);
}

template <typename I>
void PassthroughImageCache<I>::aio_writesame(uint64_t offset, uint64_t length,
                                             bufferlist&& bl, int fadvise_flags,
                                             Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "offset=" << offset << ", "
                 << "length=" << length << ", "
                 << "data_len=" << bl.length() << ", "
                 << "on_finish=" << on_finish << dendl;

  m_image_writeback.aio_writesame(offset, length, std::move(bl), fadvise_flags,
                                  on_finish);
}

template <typename I>
void PassthroughImageCache<I>::aio_compare_and_write(Extents &&image_extents,
                                                     bufferlist&& cmp_bl,
                                                     bufferlist&& bl,
                                                     uint64_t *mismatch_offset,
                                                     int fadvise_flags,
                                                     Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "image_extents=" << image_extents << ", "
                 << "on_finish=" << on_finish << dendl;

  m_image_writeback.aio_compare_and_write(
    std::move(image_extents), std::move(cmp_bl), std::move(bl), mismatch_offset,
    fadvise_flags, on_finish);
}

template <typename I>
void PassthroughImageCache<I>::init(Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << dendl;

  on_finish->complete(0);
}

template <typename I>
void PassthroughImageCache<I>::shut_down(Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << dendl;

  on_finish->complete(0);
}

template <typename I>
void PassthroughImageCache<I>::invalidate(Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << dendl;

  // dump cache contents (don't have anything)
  on_finish->complete(0);
}

template <typename I>
void PassthroughImageCache<I>::flush(Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << dendl;

  // internal flush -- nothing to writeback but make sure
  // in-flight IO is flushed
  aio_flush(on_finish);
}

} // namespace cache
} // namespace librbd

template class librbd::cache::PassthroughImageCache<librbd::ImageCtx>;