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 static const std::array feature_names
   9 {
  10   "reserved",
  11   "reserved",
  12   "reserved",
  13   "reserved",
  14   "reserved",
  15   "jewel",
  16   "kraken",
  17   "luminous",
  18   "mimic",
  19   "reply_encoding",
  20   "reclaim_client",
  21   "lazy_caps_wanted",
  22   "multi_reconnect",
  23   "deleg_ino",
  24   "metric_collect",
  25   "alternate_name",
  26 };
  27 static_assert(feature_names.size() == CEPHFS_FEATURE_MAX + 1);
  28
  29 std::string_view cephfs_feature_name(size_t id)
  30 {
  31   if (id > feature_names.size())
  32     return "unknown";
  33   return feature_names[id];
  34 }
  35
  36 int cephfs_feature_from_name(std::string_view name)
  37 {
  38   if (name == "reserved") {
  39     return -1;
  40   }
  41   for (size_t i = 0; i < feature_names.size(); ++i) {
  42     if (name == feature_names[i])
  43       return i;
  44   }
  45   return -1;
  46 }
  47
  48 std::string cephfs_stringify_features(const feature_bitset_t& features)
  49 {
  50   CachedStackStringStream css;
  51   bool first = true;
  52   *css << "{";
  53   for (size_t i = 0; i < feature_names.size(); ++i) {
  54     if (!features.test(i))
  55       continue;
  56     if (!first)
  57       *css << ",";
  58     *css << i << "=" << cephfs_feature_name(i);
  59     first = false;
  60   }
  61   *css << "}";
  62   return css->str();
  63 }
  64
  65 void cephfs_dump_features(ceph::Formatter *f, const feature_bitset_t& features)
  66 {
  67   for (size_t i = 0; i < feature_names.size(); ++i) {
  68     if (!features.test(i))
  69       continue;
  70     char s[18];
  71     snprintf(s, sizeof(s), "feature_%zu", i);
  72     f->dump_string(s, cephfs_feature_name(i));
  73   }
  74 }
  75