ceph/src/librbd/io/IoOperations.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 <boost/lexical_cast.hpp>
   5 #include <boost/algorithm/string.hpp>
   6
   7 #include "librbd/io/Types.h"
   8 #include "librbd/io/IoOperations.h"
   9
  10 #include <map>
  11 #include <vector>
  12
  13 namespace librbd {
  14 namespace io {
  15
  16 #define RBD_IO_OPERATION_NAME_READ                 "read"
  17 #define RBD_IO_OPERATION_NAME_WRITE                "write"
  18 #define RBD_IO_OPERATION_NAME_DISCARD              "discard"
  19 #define RBD_IO_OPERATION_NAME_WRITE_SAME           "write_same"
  20 #define RBD_IO_OPERATION_NAME_COMPARE_AND_WRITE    "compare_and_write"
  21
  22 static const std::map<std::string, uint64_t> RBD_IO_OPERATION_MAP = {
  23   {RBD_IO_OPERATION_NAME_READ, RBD_IO_OPERATION_READ},
  24   {RBD_IO_OPERATION_NAME_WRITE, RBD_IO_OPERATION_WRITE},
  25   {RBD_IO_OPERATION_NAME_DISCARD, RBD_IO_OPERATION_DISCARD},
  26   {RBD_IO_OPERATION_NAME_WRITE_SAME, RBD_IO_OPERATION_WRITE_SAME},
  27   {RBD_IO_OPERATION_NAME_COMPARE_AND_WRITE, RBD_IO_OPERATION_COMPARE_AND_WRITE},
  28 };
  29 static_assert((RBD_IO_OPERATION_COMPARE_AND_WRITE << 1) > RBD_IO_OPERATIONS_ALL,
  30                           "new RBD io operation added");
  31
  32 std::string rbd_io_operations_to_string(uint64_t operations,
  33                                         std::ostream *err)
  34 {
  35   std::string r;
  36   for (auto& i : RBD_IO_OPERATION_MAP) {
  37     if (operations & i.second) {
  38       if (!r.empty()) {
  39       r += ",";
  40       }
  41       r += i.first;
  42       operations &= ~i.second;
  43     }
  44   }
  45   if (err && operations) {
  46     *err << "ignoring unknown io operation mask 0x"
  47          << std::hex << operations << std::dec;
  48   }
  49   return r;
  50 }
  51
  52 uint64_t rbd_io_operations_from_string(const std::string& orig_value,
  53                                        std::ostream *err)
  54 {
  55   uint64_t operations = 0;
  56   std::string value = orig_value;
  57   boost::trim(value);
  58
  59   // empty string means default operations
  60   if (!value.size()) {
  61     return RBD_IO_OPERATIONS_DEFAULT;
  62   }
  63
  64   try {
  65     // numeric?
  66     operations = boost::lexical_cast<uint64_t>(value);
  67
  68     // drop unrecognized bits
  69     uint64_t unsupported_operations = (operations & ~RBD_IO_OPERATIONS_ALL);
  70     if (unsupported_operations != 0ull) {
  71       operations &= RBD_IO_OPERATIONS_ALL;
  72       if (err) {
  73         *err << "ignoring unknown operation mask 0x"
  74              << std::hex << unsupported_operations << std::dec;
  75       }
  76     }
  77   } catch (boost::bad_lexical_cast&) {
  78     // operation name list?
  79     bool errors = false;
  80     std::vector<std::string> operation_names;
  81     boost::split(operation_names, value, boost::is_any_of(","));
  82     for (auto operation_name: operation_names) {
  83       boost::trim(operation_name);
  84       auto operation_it = RBD_IO_OPERATION_MAP.find(operation_name);
  85       if (operation_it != RBD_IO_OPERATION_MAP.end()) {
  86         operations += operation_it->second;
  87       } else if (err) {
  88         if (errors) {
  89           *err << ", ";
  90         } else {
  91           errors = true;
  92         }
  93         *err << "ignoring unknown operation " << operation_name;
  94       }
  95     }
  96   }
  97   return operations;
  98 }
  99
 100 } // namespace io
 101 } // namespace librbd