ceph/src/mon/FSCommands.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2017 Red Hat Ltd
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15
  16 #ifndef FS_COMMANDS_H_
  17 #define FS_COMMANDS_H_
  18
  19 #include "Monitor.h"
  20
  21 #include "osd/OSDMap.h"
  22 #include "mds/FSMap.h"
  23
  24 #include <string>
  25 #include <sstream>
  26
  27 class FileSystemCommandHandler
  28 {
  29 protected:
  30   std::string prefix;
  31
  32   /**
  33    * Parse true|yes|1 style boolean string from `bool_str`
  34    * `result` must be non-null.
  35    * `ss` will be populated with error message on error.
  36    *
  37    * @return 0 on success, else -EINVAL
  38    */
  39   int parse_bool(
  40       const std::string &bool_str,
  41       bool *result,
  42       std::ostream &ss);
  43
  44   /**
  45    * Return 0 if the pool is suitable for use with CephFS, or
  46    * in case of errors return a negative error code, and populate
  47    * the passed stringstream with an explanation.
  48    *
  49    * @param metadata whether the pool will be for metadata (stricter checks)
  50    */
  51   int _check_pool(
  52       OSDMap &osd_map,
  53       const int64_t pool_id,
  54       bool metadata,
  55       bool force,
  56       std::stringstream *ss) const;
  57
  58   virtual std::string const &get_prefix() {return prefix;}
  59
  60 public:
  61   FileSystemCommandHandler(const std::string &prefix_)
  62     : prefix(prefix_)
  63   {}
  64
  65   virtual ~FileSystemCommandHandler()
  66   {}
  67
  68   bool can_handle(std::string const &prefix_)
  69   {
  70     return get_prefix() == prefix_;
  71   }
  72
  73   static std::list<std::shared_ptr<FileSystemCommandHandler> > load(Paxos *paxos);
  74
  75   virtual bool batched_propose() {
  76     return false;
  77   }
  78
  79   virtual int handle(
  80     Monitor *mon,
  81     FSMap &fsmap,
  82     MonOpRequestRef op,
  83     map<string, cmd_vartype> &cmdmap,
  84     std::stringstream &ss) = 0;
  85 };
  86
  87 #endif