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-rw-r--r--src/librbd/io/ImageDispatchSpec.h254
1 files changed, 254 insertions, 0 deletions
diff --git a/src/librbd/io/ImageDispatchSpec.h b/src/librbd/io/ImageDispatchSpec.h
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+++ b/src/librbd/io/ImageDispatchSpec.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_IO_IMAGE_DISPATCH_SPEC_H
+#define CEPH_LIBRBD_IO_IMAGE_DISPATCH_SPEC_H
+
+#include "include/int_types.h"
+#include "include/buffer.h"
+#include "include/Context.h"
+#include "common/zipkin_trace.h"
+#include "librbd/io/AioCompletion.h"
+#include "librbd/io/Types.h"
+#include "librbd/io/ReadResult.h"
+#include <boost/variant/variant.hpp>
+#include <atomic>
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace io {
+
+struct ImageDispatcherInterface;
+
+class ImageDispatchSpec {
+private:
+ // helper to avoid extra heap allocation per object IO
+ struct C_Dispatcher : public Context {
+ ImageDispatchSpec* image_dispatch_spec;
+
+ C_Dispatcher(ImageDispatchSpec* image_dispatch_spec)
+ : image_dispatch_spec(image_dispatch_spec) {
+ }
+
+ void complete(int r) override;
+ void finish(int r) override;
+ };
+
+public:
+ struct Read {
+ ReadResult read_result;
+ int read_flags;
+
+ Read(ReadResult &&read_result, int read_flags)
+ : read_result(std::move(read_result)), read_flags(read_flags) {
+ }
+ };
+
+ struct Discard {
+ uint32_t discard_granularity_bytes;
+
+ Discard(uint32_t discard_granularity_bytes)
+ : discard_granularity_bytes(discard_granularity_bytes) {
+ }
+ };
+
+ struct Write {
+ bufferlist bl;
+
+ Write(bufferlist&& bl) : bl(std::move(bl)) {
+ }
+ };
+
+ struct WriteSame {
+ bufferlist bl;
+
+ WriteSame(bufferlist&& bl) : bl(std::move(bl)) {
+ }
+ };
+
+ struct CompareAndWrite {
+ bufferlist cmp_bl;
+ bufferlist bl;
+ uint64_t *mismatch_offset;
+
+ CompareAndWrite(bufferlist&& cmp_bl, bufferlist&& bl,
+ uint64_t *mismatch_offset)
+ : cmp_bl(std::move(cmp_bl)), bl(std::move(bl)),
+ mismatch_offset(mismatch_offset) {
+ }
+ };
+
+ struct Flush {
+ FlushSource flush_source;
+
+ Flush(FlushSource flush_source) : flush_source(flush_source) {
+ }
+ };
+
+ struct ListSnaps {
+ SnapIds snap_ids;
+ int list_snaps_flags;
+ SnapshotDelta* snapshot_delta;
+
+ ListSnaps(SnapIds&& snap_ids, int list_snaps_flags,
+ SnapshotDelta* snapshot_delta)
+ : snap_ids(std::move(snap_ids)), list_snaps_flags(list_snaps_flags),
+ snapshot_delta(snapshot_delta) {
+ }
+ };
+
+ typedef boost::variant<Read,
+ Discard,
+ Write,
+ WriteSame,
+ CompareAndWrite,
+ Flush,
+ ListSnaps> Request;
+
+ C_Dispatcher dispatcher_ctx;
+
+ ImageDispatcherInterface* image_dispatcher;
+ ImageDispatchLayer dispatch_layer;
+ std::atomic<uint32_t> image_dispatch_flags = 0;
+ DispatchResult dispatch_result = DISPATCH_RESULT_INVALID;
+
+ AioCompletion* aio_comp;
+ Extents image_extents;
+ Request request;
+ IOContext io_context;
+ int op_flags;
+ ZTracer::Trace parent_trace;
+ uint64_t tid = 0;
+
+ template <typename ImageCtxT = ImageCtx>
+ static ImageDispatchSpec* create_read(
+ ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
+ AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
+ ReadResult &&read_result, IOContext io_context, int op_flags,
+ int read_flags, const ZTracer::Trace &parent_trace) {
+ return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
+ image_dispatch_layer, aio_comp,
+ std::move(image_extents), area,
+ Read{std::move(read_result), read_flags},
+ io_context, op_flags, parent_trace);
+ }
+
+ template <typename ImageCtxT = ImageCtx>
+ static ImageDispatchSpec* create_discard(
+ ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
+ AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
+ uint32_t discard_granularity_bytes, const ZTracer::Trace &parent_trace) {
+ return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
+ image_dispatch_layer, aio_comp,
+ std::move(image_extents), area,
+ Discard{discard_granularity_bytes},
+ {}, 0, parent_trace);
+ }
+
+ template <typename ImageCtxT = ImageCtx>
+ static ImageDispatchSpec* create_write(
+ ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
+ AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
+ bufferlist &&bl, int op_flags, const ZTracer::Trace &parent_trace) {
+ return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
+ image_dispatch_layer, aio_comp,
+ std::move(image_extents), area,
+ Write{std::move(bl)},
+ {}, op_flags, parent_trace);
+ }
+
+ template <typename ImageCtxT = ImageCtx>
+ static ImageDispatchSpec* create_write_same(
+ ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
+ AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
+ bufferlist &&bl, int op_flags, const ZTracer::Trace &parent_trace) {
+ return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
+ image_dispatch_layer, aio_comp,
+ std::move(image_extents), area,
+ WriteSame{std::move(bl)},
+ {}, op_flags, parent_trace);
+ }
+
+ template <typename ImageCtxT = ImageCtx>
+ static ImageDispatchSpec* create_compare_and_write(
+ ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
+ AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
+ bufferlist &&cmp_bl, bufferlist &&bl, uint64_t *mismatch_offset,
+ int op_flags, const ZTracer::Trace &parent_trace) {
+ return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
+ image_dispatch_layer, aio_comp,
+ std::move(image_extents), area,
+ CompareAndWrite{std::move(cmp_bl),
+ std::move(bl),
+ mismatch_offset},
+ {}, op_flags, parent_trace);
+ }
+
+ template <typename ImageCtxT = ImageCtx>
+ static ImageDispatchSpec* create_flush(
+ ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
+ AioCompletion *aio_comp, FlushSource flush_source,
+ const ZTracer::Trace &parent_trace) {
+ return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
+ image_dispatch_layer, aio_comp, {},
+ ImageArea::DATA /* dummy for {} */,
+ Flush{flush_source}, {}, 0, parent_trace);
+ }
+
+ template <typename ImageCtxT = ImageCtx>
+ static ImageDispatchSpec* create_list_snaps(
+ ImageCtxT &image_ctx, ImageDispatchLayer image_dispatch_layer,
+ AioCompletion *aio_comp, Extents &&image_extents, ImageArea area,
+ SnapIds&& snap_ids, int list_snaps_flags, SnapshotDelta* snapshot_delta,
+ const ZTracer::Trace &parent_trace) {
+ return new ImageDispatchSpec(image_ctx.io_image_dispatcher,
+ image_dispatch_layer, aio_comp,
+ std::move(image_extents), area,
+ ListSnaps{std::move(snap_ids),
+ list_snaps_flags, snapshot_delta},
+ {}, 0, parent_trace);
+ }
+
+ ~ImageDispatchSpec() {
+ aio_comp->put();
+ }
+
+ void send();
+ void fail(int r);
+
+private:
+ struct SendVisitor;
+ struct IsWriteOpVisitor;
+ struct TokenRequestedVisitor;
+
+ ImageDispatchSpec(ImageDispatcherInterface* image_dispatcher,
+ ImageDispatchLayer image_dispatch_layer,
+ AioCompletion* aio_comp, Extents&& image_extents,
+ ImageArea area, Request&& request, IOContext io_context,
+ int op_flags, const ZTracer::Trace& parent_trace)
+ : dispatcher_ctx(this), image_dispatcher(image_dispatcher),
+ dispatch_layer(image_dispatch_layer), aio_comp(aio_comp),
+ image_extents(std::move(image_extents)), request(std::move(request)),
+ io_context(io_context), op_flags(op_flags), parent_trace(parent_trace) {
+ ceph_assert(aio_comp->image_dispatcher_ctx == nullptr);
+ aio_comp->image_dispatcher_ctx = &dispatcher_ctx;
+ aio_comp->get();
+
+ switch (area) {
+ case ImageArea::DATA:
+ break;
+ case ImageArea::CRYPTO_HEADER:
+ image_dispatch_flags |= IMAGE_DISPATCH_FLAG_CRYPTO_HEADER;
+ break;
+ default:
+ ceph_abort();
+ }
+ }
+};
+
+} // namespace io
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_IO_IMAGE_DISPATCH_SPEC_H
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-12 12:33:35 +0000