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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_OPERATION_TRIM_REQUEST_H
#define CEPH_LIBRBD_OPERATION_TRIM_REQUEST_H
#include "librbd/AsyncRequest.h"
namespace librbd
{
class ImageCtx;
class ProgressContext;
namespace operation {
template <typename ImageCtxT = ImageCtx>
class TrimRequest : public AsyncRequest<ImageCtxT>
{
public:
static TrimRequest *create(ImageCtxT &image_ctx, Context *on_finish,
uint64_t original_size, uint64_t new_size,
ProgressContext &prog_ctx) {
return new TrimRequest(image_ctx, on_finish, original_size, new_size,
prog_ctx);
}
TrimRequest(ImageCtxT &image_ctx, Context *on_finish,
uint64_t original_size, uint64_t new_size,
ProgressContext &prog_ctx);
void send() override;
protected:
/**
* Trim goes through the following state machine to remove whole objects,
* clean partially trimmed objects, and update the object map:
*
* @verbatim
*
* <start> . . . . . . . . . . . . . . . . .
* | .
* v (skip if not needed) .
* STATE_PRE_TRIM .
* | .
* v (skip if not needed) .
* STATE_COPYUP_OBJECTS .
* | .
* v (skip if not needed) .
* STATE_REMOVE_OBJECTS .
* | .
* v (skip if not needed) .
* STATE_POST_TRIM .
* | .
* v (skip if not needed) .
* STATE_CLEAN_BOUNDARY .
* | .
* v .
* STATE_FINISHED < . . . . . . . . . . . . . . .
* |
* v
* <finish>
*
* The _COPYUP_OBJECTS state is skipped if there is no parent overlap
* within the new image size and the image does not have any snapshots.
* The _PRE_TRIM/_POST_TRIM states are skipped if the object map
* isn't enabled. The _REMOVE_OBJECTS state is skipped if no whole objects
* are removed. The _CLEAN_BOUNDARY state is skipped if no boundary
* objects are cleaned. The state machine will immediately transition
* to _FINISHED state if there are no bytes to trim.
*/
enum State {
STATE_PRE_TRIM,
STATE_COPYUP_OBJECTS,
STATE_REMOVE_OBJECTS,
STATE_POST_TRIM,
STATE_CLEAN_BOUNDARY,
STATE_FINISHED
};
bool should_complete(int r) override;
State m_state = STATE_PRE_TRIM;
private:
uint64_t m_delete_start;
uint64_t m_delete_start_min = 0;
uint64_t m_num_objects;
uint64_t m_delete_off;
uint64_t m_new_size;
ProgressContext &m_prog_ctx;
void send_pre_trim();
void send_copyup_objects();
void send_remove_objects();
void send_post_trim();
void send_clean_boundary();
void send_finish(int r);
};
} // namespace operation
} // namespace librbd
extern template class librbd::operation::TrimRequest<librbd::ImageCtx>;
#endif // CEPH_LIBRBD_OPERATION_TRIM_REQUEST_H
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