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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_OSDC_WRITEBACKHANDLER_H
#define CEPH_OSDC_WRITEBACKHANDLER_H
#include "include/Context.h"
#include "include/types.h"
#include "common/zipkin_trace.h"
#include "osd/osd_types.h"
class WritebackHandler {
public:
WritebackHandler() {}
virtual ~WritebackHandler() {}
virtual void read(const object_t& oid, uint64_t object_no,
const object_locator_t& oloc, uint64_t off, uint64_t len,
snapid_t snapid, ceph::buffer::list *pbl, uint64_t trunc_size,
__u32 trunc_seq, int op_flags,
const ZTracer::Trace &parent_trace, Context *onfinish) = 0;
/**
* check if a given extent read result may change due to a write
*
* Check if the content we see at the given read offset may change
* due to a write to this object.
*
* @param oid object
* @param read_off read offset
* @param read_len read length
* @param snapid read snapid
*/
virtual bool may_copy_on_write(const object_t& oid, uint64_t read_off,
uint64_t read_len, snapid_t snapid) = 0;
virtual ceph_tid_t write(const object_t& oid, const object_locator_t& oloc,
uint64_t off, uint64_t len,
const SnapContext& snapc,
const ceph::buffer::list &bl, ceph::real_time mtime,
uint64_t trunc_size, __u32 trunc_seq,
ceph_tid_t journal_tid,
const ZTracer::Trace &parent_trace,
Context *oncommit) = 0;
virtual void overwrite_extent(const object_t& oid, uint64_t off, uint64_t len,
ceph_tid_t original_journal_tid,
ceph_tid_t new_journal_tid) {}
virtual bool can_scattered_write() { return false; }
virtual ceph_tid_t write(const object_t& oid, const object_locator_t& oloc,
std::vector<std::pair<uint64_t, ceph::buffer::list> >& io_vec,
const SnapContext& snapc, ceph::real_time mtime,
uint64_t trunc_size, __u32 trunc_seq,
Context *oncommit) {
return 0;
}
};
#endif
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