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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#ifndef CEPH_STRIPER_H
+#define CEPH_STRIPER_H
+
+#include "include/common_fwd.h"
+#include "include/types.h"
+#include "osd/osd_types.h"
+#include "osdc/StriperTypes.h"
+
+
+//namespace ceph {
+
+ class Striper {
+ public:
+ static void file_to_extents(
+ CephContext *cct, const file_layout_t *layout, uint64_t offset,
+ uint64_t len, uint64_t trunc_size, uint64_t buffer_offset,
+ striper::LightweightObjectExtents* object_extents);
+
+ /*
+ * std::map (ino, layout, offset, len) to a (list of) ObjectExtents (byte
+ * ranges in objects on (primary) osds)
+ */
+ static void file_to_extents(CephContext *cct, const char *object_format,
+ const file_layout_t *layout,
+ uint64_t offset, uint64_t len,
+ uint64_t trunc_size,
+ std::map<object_t, std::vector<ObjectExtent> >& extents,
+ uint64_t buffer_offset=0);
+
+ static void file_to_extents(CephContext *cct, const char *object_format,
+ const file_layout_t *layout,
+ uint64_t offset, uint64_t len,
+ uint64_t trunc_size,
+ std::vector<ObjectExtent>& extents,
+ uint64_t buffer_offset=0);
+
+ static void file_to_extents(CephContext *cct, inodeno_t ino,
+ const file_layout_t *layout,
+ uint64_t offset, uint64_t len,
+ uint64_t trunc_size,
+ std::vector<ObjectExtent>& extents) {
+ // generate prefix/format
+ char buf[32];
+ snprintf(buf, sizeof(buf), "%llx.%%08llx", (long long unsigned)ino);
+
+ file_to_extents(cct, buf, layout, offset, len, trunc_size, extents);
+ }
+
+ /**
+ * reverse std::map an object extent to file extents
+ */
+ static void extent_to_file(CephContext *cct, file_layout_t *layout,
+ uint64_t objectno, uint64_t off, uint64_t len,
+ std::vector<std::pair<uint64_t, uint64_t> >& extents);
+
+ static uint64_t object_truncate_size(
+ CephContext *cct, const file_layout_t *layout,
+ uint64_t objectno, uint64_t trunc_size);
+
+ static uint64_t get_num_objects(const file_layout_t& layout,
+ uint64_t size);
+
+ static uint64_t get_file_offset(CephContext *cct,
+ const file_layout_t *layout, uint64_t objectno, uint64_t off);
+ /*
+ * helper to assemble a striped result
+ */
+ class StripedReadResult {
+ // offset -> (data, intended length)
+ std::map<uint64_t, std::pair<ceph::buffer::list, uint64_t> > partial;
+ uint64_t total_intended_len = 0; //sum of partial.second.second
+
+ public:
+ void add_partial_result(
+ CephContext *cct, ceph::buffer::list& bl,
+ const std::vector<std::pair<uint64_t,uint64_t> >& buffer_extents);
+ void add_partial_result(
+ CephContext *cct, ceph::buffer::list&& bl,
+ const striper::LightweightBufferExtents& buffer_extents);
+
+ /**
+ * add sparse read into results
+ *
+ * @param bl buffer
+ * @param bl_map std::map of which logical source extents this covers
+ * @param bl_off logical buffer offset (e.g., first bl_map key
+ * if the buffer is not sparse)
+ * @param buffer_extents output buffer extents the data maps to
+ */
+ void add_partial_sparse_result(
+ CephContext *cct, ceph::buffer::list& bl,
+ const std::map<uint64_t, uint64_t>& bl_map, uint64_t bl_off,
+ const std::vector<std::pair<uint64_t,uint64_t> >& buffer_extents);
+ void add_partial_sparse_result(
+ CephContext *cct, ceph::buffer::list&& bl,
+ const std::vector<std::pair<uint64_t, uint64_t>>& bl_map,
+ uint64_t bl_off,
+ const striper::LightweightBufferExtents& buffer_extents);
+
+ void assemble_result(CephContext *cct, ceph::buffer::list& bl,
+ bool zero_tail);
+
+ /**
+ * @buffer copy read data into buffer
+ * @len the length of buffer
+ */
+ void assemble_result(CephContext *cct, char *buffer, size_t len);
+
+ uint64_t assemble_result(CephContext *cct,
+ std::map<uint64_t, uint64_t> *extent_map,
+ ceph::buffer::list *bl);
+ };
+
+ };
+
+//};
+
+#endif