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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_CACHE_OBJECT_CACHER_WRITEBACK_H
#define CEPH_LIBRBD_CACHE_OBJECT_CACHER_WRITEBACK_H
#include "common/snap_types.h"
#include "osd/osd_types.h"
#include "osdc/WritebackHandler.h"
#include <queue>
class Context;
namespace librbd {
struct ImageCtx;
namespace cache {
class ObjectCacherWriteback : public WritebackHandler {
public:
static const int READ_FLAGS_MASK = 0xF000;
static const int READ_FLAGS_SHIFT = 24;
ObjectCacherWriteback(ImageCtx *ictx, ceph::mutex& lock);
// Note that oloc, trunc_size, and trunc_seq are ignored
void read(const object_t& oid, uint64_t object_no,
const object_locator_t& oloc, uint64_t off, uint64_t len,
snapid_t snapid, bufferlist *pbl, uint64_t trunc_size,
__u32 trunc_seq, int op_flags,
const ZTracer::Trace &parent_trace, Context *onfinish) override;
// Determine whether a read to this extent could be affected by a
// write-triggered copy-on-write
bool may_copy_on_write(const object_t& oid, uint64_t read_off,
uint64_t read_len, snapid_t snapid) override;
// Note that oloc, trunc_size, and trunc_seq are ignored
ceph_tid_t write(const object_t& oid, const object_locator_t& oloc,
uint64_t off, uint64_t len,
const SnapContext& snapc, const bufferlist &bl,
ceph::real_time mtime, uint64_t trunc_size,
__u32 trunc_seq, ceph_tid_t journal_tid,
const ZTracer::Trace &parent_trace,
Context *oncommit) override;
using WritebackHandler::write;
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) override;
struct write_result_d {
bool done;
int ret;
std::string oid;
Context *oncommit;
write_result_d(const std::string& oid, Context *oncommit) :
done(false), ret(0), oid(oid), oncommit(oncommit) {}
private:
write_result_d(const write_result_d& rhs);
const write_result_d& operator=(const write_result_d& rhs);
};
private:
void complete_writes(const std::string& oid);
ceph_tid_t m_tid;
ceph::mutex& m_lock;
librbd::ImageCtx *m_ictx;
ceph::unordered_map<std::string, std::queue<write_result_d*> > m_writes;
friend class C_OrderedWrite;
};
} // namespace cache
} // namespace librbd
#endif // CEPH_LIBRBD_CACHE_OBJECT_CACHER_WRITEBACK_H
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