ceph/src/mds/cephfs_features.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include <array>
   5 #include "cephfs_features.h"
   6 #include "mdstypes.h"
   7
   8 #include <fmt/format.h>
   9
  10 static const std::array feature_names
  11 {
  12   "reserved",
  13   "reserved",
  14   "reserved",
  15   "reserved",
  16   "reserved",
  17   "jewel",
  18   "kraken",
  19   "luminous",
  20   "mimic",
  21   "reply_encoding",
  22   "reclaim_client",
  23   "lazy_caps_wanted",
  24   "multi_reconnect",
  25   "deleg_ino",
  26   "metric_collect",
  27   "alternate_name",
  28   "notify_session_state",
  29   "op_getvxattr",
  30   "32bits_retry_fwd",
  31   "new_snaprealm_info",
  32 };
  33 static_assert(feature_names.size() == CEPHFS_FEATURE_MAX + 1);
  34
  35 std::string_view cephfs_feature_name(size_t id)
  36 {
  37   if (id > feature_names.size())
  38     return "unknown";
  39   return feature_names[id];
  40 }
  41
  42 int cephfs_feature_from_name(std::string_view name)
  43 {
  44   if (name == "reserved") {
  45     return -1;
  46   }
  47   for (size_t i = 0; i < feature_names.size(); ++i) {
  48     if (name == feature_names[i])
  49       return i;
  50   }
  51   return -1;
  52 }
  53
  54 std::string cephfs_stringify_features(const feature_bitset_t& features)
  55 {
  56   CachedStackStringStream css;
  57   bool first = true;
  58   *css << "{";
  59   for (size_t i = 0; i < feature_names.size(); ++i) {
  60     if (!features.test(i))
  61       continue;
  62     if (!first)
  63       *css << ",";
  64     *css << i << "=" << cephfs_feature_name(i);
  65     first = false;
  66   }
  67   *css << "}";
  68   return css->str();
  69 }
  70
  71 void cephfs_dump_features(ceph::Formatter *f, const feature_bitset_t& features)
  72 {
  73   for (size_t i = 0; i < feature_names.size(); ++i) {
  74     if (!features.test(i))
  75       continue;
  76     f->dump_string(fmt::format("feature_{}", i),
  77                    cephfs_feature_name(i));
  78   }
  79 }