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-rw-r--r--src/librbd/cache/ObjectCacherWriteback.h78
1 files changed, 78 insertions, 0 deletions
diff --git a/src/librbd/cache/ObjectCacherWriteback.h b/src/librbd/cache/ObjectCacherWriteback.h
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+++ b/src/librbd/cache/ObjectCacherWriteback.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_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