ceph/src/common/io_priority.cc

   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) 2012 Red Hat
   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 #include <unistd.h>
  16 #ifdef __linux__
  17 #include <sys/syscall.h>   /* For SYS_xxx definitions */
  18 #endif
  19 #include <algorithm>
  20 #include <errno.h>
  21
  22 #include "io_priority.h"
  23
  24 pid_t ceph_gettid(void)
  25 {
  26 #ifdef __linux__
  27   return syscall(SYS_gettid);
  28 #else
  29   return -ENOSYS;
  30 #endif
  31 }
  32
  33 int ceph_ioprio_set(int whence, int who, int ioprio)
  34 {
  35 #ifdef __linux__
  36   return syscall(SYS_ioprio_set, whence, who, ioprio);
  37 #else
  38   return -ENOSYS;
  39 #endif
  40 }
  41
  42 int ceph_ioprio_string_to_class(const std::string& s)
  43 {
  44   std::string l = s;
  45   std::transform(l.begin(), l.end(), l.begin(), ::tolower);
  46
  47   if (l == "idle")
  48     return IOPRIO_CLASS_IDLE;
  49   if (l == "be" || l == "besteffort" || l == "best effort")
  50     return IOPRIO_CLASS_BE;
  51   if (l == "rt" || l == "realtime" || l == "real time")
  52     return IOPRIO_CLASS_RT;
  53   return -EINVAL;
  54 }