Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 169 insertions, 0 deletions

diff --git a/src/osd/ECUtil.h b/src/osd/ECUtil.h
new file mode 100644
index 00000000..8e980e27
--- /dev/null
+++ b/src/osd/ECUtil.h
@@ -0,0 +1,169 @@
+// -*- 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) 2013 Inktank Storage, Inc.
+ *
+ * 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 ECUTIL_H
+#define ECUTIL_H
+
+#include <ostream>
+#include "erasure-code/ErasureCodeInterface.h"
+#include "include/buffer_fwd.h"
+#include "include/ceph_assert.h"
+#include "include/encoding.h"
+#include "common/Formatter.h"
+
+namespace ECUtil {
+
+class stripe_info_t {
+  const uint64_t stripe_width;
+  const uint64_t chunk_size;
+public:
+  stripe_info_t(uint64_t stripe_size, uint64_t stripe_width)
+    : stripe_width(stripe_width),
+      chunk_size(stripe_width / stripe_size) {
+    ceph_assert(stripe_width % stripe_size == 0);
+  }
+  bool logical_offset_is_stripe_aligned(uint64_t logical) const {
+    return (logical % stripe_width) == 0;
+  }
+  uint64_t get_stripe_width() const {
+    return stripe_width;
+  }
+  uint64_t get_chunk_size() const {
+    return chunk_size;
+  }
+  uint64_t logical_to_prev_chunk_offset(uint64_t offset) const {
+    return (offset / stripe_width) * chunk_size;
+  }
+  uint64_t logical_to_next_chunk_offset(uint64_t offset) const {
+    return ((offset + stripe_width - 1)/ stripe_width) * chunk_size;
+  }
+  uint64_t logical_to_prev_stripe_offset(uint64_t offset) const {
+    return offset - (offset % stripe_width);
+  }
+  uint64_t logical_to_next_stripe_offset(uint64_t offset) const {
+    return ((offset % stripe_width) ?
+      (offset - (offset % stripe_width) + stripe_width) :
+      offset);
+  }
+  uint64_t aligned_logical_offset_to_chunk_offset(uint64_t offset) const {
+    ceph_assert(offset % stripe_width == 0);
+    return (offset / stripe_width) * chunk_size;
+  }
+  uint64_t aligned_chunk_offset_to_logical_offset(uint64_t offset) const {
+    ceph_assert(offset % chunk_size == 0);
+    return (offset / chunk_size) * stripe_width;
+  }
+  std::pair<uint64_t, uint64_t> aligned_offset_len_to_chunk(
+    std::pair<uint64_t, uint64_t> in) const {
+    return std::make_pair(
+      aligned_logical_offset_to_chunk_offset(in.first),
+      aligned_logical_offset_to_chunk_offset(in.second));
+  }
+  std::pair<uint64_t, uint64_t> offset_len_to_stripe_bounds(
+    std::pair<uint64_t, uint64_t> in) const {
+    uint64_t off = logical_to_prev_stripe_offset(in.first);
+    uint64_t len = logical_to_next_stripe_offset(
+      (in.first - off) + in.second);
+    return std::make_pair(off, len);
+  }
+};
+
+int decode(
+  const stripe_info_t &sinfo,
+  ErasureCodeInterfaceRef &ec_impl,
+  std::map<int, bufferlist> &to_decode,
+  bufferlist *out);
+
+int decode(
+  const stripe_info_t &sinfo,
+  ErasureCodeInterfaceRef &ec_impl,
+  std::map<int, bufferlist> &to_decode,
+  std::map<int, bufferlist*> &out);
+
+int encode(
+  const stripe_info_t &sinfo,
+  ErasureCodeInterfaceRef &ec_impl,
+  bufferlist &in,
+  const std::set<int> &want,
+  std::map<int, bufferlist> *out);
+
+class HashInfo {
+  uint64_t total_chunk_size = 0;
+  std::vector<uint32_t> cumulative_shard_hashes;
+
+  // purely ephemeral, represents the size once all in-flight ops commit
+  uint64_t projected_total_chunk_size = 0;
+public:
+  HashInfo() {}
+  explicit HashInfo(unsigned num_chunks) :
+    cumulative_shard_hashes(num_chunks, -1) {}
+  void append(uint64_t old_size, std::map<int, bufferlist> &to_append);
+  void clear() {
+    total_chunk_size = 0;
+    cumulative_shard_hashes = std::vector<uint32_t>(
+      cumulative_shard_hashes.size(),
+      -1);
+  }
+  void encode(bufferlist &bl) const;
+  void decode(bufferlist::const_iterator &bl);
+  void dump(Formatter *f) const;
+  static void generate_test_instances(std::list<HashInfo*>& o);
+  uint32_t get_chunk_hash(int shard) const {
+    ceph_assert((unsigned)shard < cumulative_shard_hashes.size());
+    return cumulative_shard_hashes[shard];
+  }
+  uint64_t get_total_chunk_size() const {
+    return total_chunk_size;
+  }
+  uint64_t get_projected_total_chunk_size() const {
+    return projected_total_chunk_size;
+  }
+  uint64_t get_total_logical_size(const stripe_info_t &sinfo) const {
+    return get_total_chunk_size() *
+      (sinfo.get_stripe_width()/sinfo.get_chunk_size());
+  }
+  uint64_t get_projected_total_logical_size(const stripe_info_t &sinfo) const {
+    return get_projected_total_chunk_size() *
+      (sinfo.get_stripe_width()/sinfo.get_chunk_size());
+  }
+  void set_projected_total_logical_size(
+    const stripe_info_t &sinfo,
+    uint64_t logical_size) {
+    ceph_assert(sinfo.logical_offset_is_stripe_aligned(logical_size));
+    projected_total_chunk_size = sinfo.aligned_logical_offset_to_chunk_offset(
+      logical_size);
+  }
+  void set_total_chunk_size_clear_hash(uint64_t new_chunk_size) {
+    cumulative_shard_hashes.clear();
+    total_chunk_size = new_chunk_size;
+  }
+  bool has_chunk_hash() const {
+    return !cumulative_shard_hashes.empty();
+  }
+  void update_to(const HashInfo &rhs) {
+    auto ptcs = projected_total_chunk_size;
+    *this = rhs;
+    projected_total_chunk_size = ptcs;
+  }
+  friend std::ostream& operator<<(std::ostream& out, const HashInfo& hi);
+};
+
+typedef std::shared_ptr<HashInfo> HashInfoRef;
+
+bool is_hinfo_key_string(const std::string &key);
+const std::string &get_hinfo_key();
+
+WRITE_CLASS_ENCODER(ECUtil::HashInfo)
+}
+#endif