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AioImageRequest.h
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AioImageRequest.h
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_AIO_IMAGE_REQUEST_H
#define CEPH_LIBRBD_AIO_IMAGE_REQUEST_H
#include "include/int_types.h"
#include "include/buffer_fwd.h"
#include "common/snap_types.h"
#include "osd/osd_types.h"
#include "librbd/AioCompletion.h"
#include <list>
#include <utility>
#include <vector>
namespace librbd {
class AioCompletion;
class AioObjectRequestHandle;
class ImageCtx;
template <typename ImageCtxT = ImageCtx>
class AioImageRequest {
public:
typedef std::vector<std::pair<uint64_t,uint64_t> > Extents;
virtual ~AioImageRequest() {}
static void aio_read(ImageCtxT *ictx, AioCompletion *c,
const std::vector<std::pair<uint64_t,uint64_t> > &extents,
char *buf, bufferlist *pbl, int op_flags);
static void aio_read(ImageCtxT *ictx, AioCompletion *c, uint64_t off,
size_t len, char *buf, bufferlist *pbl, int op_flags);
static void aio_write(ImageCtxT *ictx, AioCompletion *c, uint64_t off,
size_t len, const char *buf, int op_flags);
static void aio_discard(ImageCtxT *ictx, AioCompletion *c, uint64_t off,
uint64_t len);
static void aio_flush(ImageCtxT *ictx, AioCompletion *c);
virtual bool is_write_op() const {
return false;
}
void start_op() {
m_aio_comp->start_op();
}
void send();
void fail(int r);
protected:
typedef std::list<AioObjectRequestHandle *> AioObjectRequests;
ImageCtxT &m_image_ctx;
AioCompletion *m_aio_comp;
AioImageRequest(ImageCtxT &image_ctx, AioCompletion *aio_comp)
: m_image_ctx(image_ctx), m_aio_comp(aio_comp) {}
virtual void send_request() = 0;
virtual aio_type_t get_aio_type() const = 0;
virtual const char *get_request_type() const = 0;
};
template <typename ImageCtxT = ImageCtx>
class AioImageRead : public AioImageRequest<ImageCtxT> {
public:
using typename AioImageRequest<ImageCtxT>::Extents;
AioImageRead(ImageCtxT &image_ctx, AioCompletion *aio_comp, uint64_t off,
size_t len, char *buf, bufferlist *pbl, int op_flags)
: AioImageRequest<ImageCtxT>(image_ctx, aio_comp), m_buf(buf), m_pbl(pbl),
m_op_flags(op_flags) {
m_image_extents.push_back(std::make_pair(off, len));
}
AioImageRead(ImageCtxT &image_ctx, AioCompletion *aio_comp,
const Extents &image_extents, char *buf, bufferlist *pbl,
int op_flags)
: AioImageRequest<ImageCtxT>(image_ctx, aio_comp),
m_image_extents(image_extents), m_buf(buf), m_pbl(pbl),
m_op_flags(op_flags) {
}
protected:
virtual void send_request();
virtual aio_type_t get_aio_type() const {
return AIO_TYPE_READ;
}
virtual const char *get_request_type() const {
return "aio_read";
}
private:
Extents m_image_extents;
char *m_buf;
bufferlist *m_pbl;
int m_op_flags;
};
template <typename ImageCtxT = ImageCtx>
class AbstractAioImageWrite : public AioImageRequest<ImageCtxT> {
public:
virtual bool is_write_op() const {
return true;
}
inline void flag_synchronous() {
m_synchronous = true;
}
protected:
using typename AioImageRequest<ImageCtxT>::AioObjectRequests;
typedef std::vector<ObjectExtent> ObjectExtents;
const uint64_t m_off;
const size_t m_len;
AbstractAioImageWrite(ImageCtxT &image_ctx, AioCompletion *aio_comp,
uint64_t off, size_t len)
: AioImageRequest<ImageCtxT>(image_ctx, aio_comp), m_off(off), m_len(len),
m_synchronous(false) {
}
virtual void send_request();
virtual void prune_object_extents(ObjectExtents &object_extents) {
}
virtual uint32_t get_cache_request_count(bool journaling) const {
return 0;
}
virtual void send_cache_requests(const ObjectExtents &object_extents,
uint64_t journal_tid) = 0;
virtual void send_object_requests(const ObjectExtents &object_extents,
const ::SnapContext &snapc,
AioObjectRequests *aio_object_requests);
virtual AioObjectRequestHandle *create_object_request(
const ObjectExtent &object_extent, const ::SnapContext &snapc,
Context *on_finish) = 0;
virtual uint64_t append_journal_event(const AioObjectRequests &requests,
bool synchronous) = 0;
virtual void update_stats(size_t length) = 0;
private:
bool m_synchronous;
};
template <typename ImageCtxT = ImageCtx>
class AioImageWrite : public AbstractAioImageWrite<ImageCtxT> {
public:
AioImageWrite(ImageCtxT &image_ctx, AioCompletion *aio_comp, uint64_t off,
size_t len, const char *buf, int op_flags)
: AbstractAioImageWrite<ImageCtxT>(image_ctx, aio_comp, off, len),
m_buf(buf), m_op_flags(op_flags) {
}
protected:
using typename AioImageRequest<ImageCtxT>::AioObjectRequests;
using typename AbstractAioImageWrite<ImageCtxT>::ObjectExtents;
virtual aio_type_t get_aio_type() const {
return AIO_TYPE_WRITE;
}
virtual const char *get_request_type() const {
return "aio_write";
}
void assemble_extent(const ObjectExtent &object_extent, bufferlist *bl);
virtual void send_cache_requests(const ObjectExtents &object_extents,
uint64_t journal_tid);
virtual void send_object_requests(const ObjectExtents &object_extents,
const ::SnapContext &snapc,
AioObjectRequests *aio_object_requests);
virtual AioObjectRequestHandle *create_object_request(
const ObjectExtent &object_extent, const ::SnapContext &snapc,
Context *on_finish);
virtual uint64_t append_journal_event(const AioObjectRequests &requests,
bool synchronous);
virtual void update_stats(size_t length);
private:
const char *m_buf;
int m_op_flags;
};
template <typename ImageCtxT = ImageCtx>
class AioImageDiscard : public AbstractAioImageWrite<ImageCtxT> {
public:
AioImageDiscard(ImageCtxT &image_ctx, AioCompletion *aio_comp, uint64_t off,
uint64_t len)
: AbstractAioImageWrite<ImageCtxT>(image_ctx, aio_comp, off, len) {
}
protected:
using typename AioImageRequest<ImageCtxT>::AioObjectRequests;
using typename AbstractAioImageWrite<ImageCtxT>::ObjectExtents;
virtual aio_type_t get_aio_type() const {
return AIO_TYPE_DISCARD;
}
virtual const char *get_request_type() const {
return "aio_discard";
}
virtual void prune_object_extents(ObjectExtents &object_extents) override;
virtual uint32_t get_cache_request_count(bool journaling) const override;
virtual void send_cache_requests(const ObjectExtents &object_extents,
uint64_t journal_tid);
virtual AioObjectRequestHandle *create_object_request(
const ObjectExtent &object_extent, const ::SnapContext &snapc,
Context *on_finish);
virtual uint64_t append_journal_event(const AioObjectRequests &requests,
bool synchronous);
virtual void update_stats(size_t length);
};
template <typename ImageCtxT = ImageCtx>
class AioImageFlush : public AioImageRequest<ImageCtxT> {
public:
AioImageFlush(ImageCtxT &image_ctx, AioCompletion *aio_comp)
: AioImageRequest<ImageCtxT>(image_ctx, aio_comp) {
}
virtual bool is_write_op() const {
return true;
}
protected:
using typename AioImageRequest<ImageCtxT>::AioObjectRequests;
virtual void send_request();
virtual aio_type_t get_aio_type() const {
return AIO_TYPE_FLUSH;
}
virtual const char *get_request_type() const {
return "aio_flush";
}
};
} // namespace librbd
extern template class librbd::AioImageRequest<librbd::ImageCtx>;
extern template class librbd::AbstractAioImageWrite<librbd::ImageCtx>;
extern template class librbd::AioImageWrite<librbd::ImageCtx>;
extern template class librbd::AioImageDiscard<librbd::ImageCtx>;
extern template class librbd::AioImageFlush<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_AIO_IMAGE_REQUEST_H