ceph/src/os/fs/XFS.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) 2014 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 "XFS.h"
  16
  17 #include <xfs/xfs.h>
  18
  19 int XFS::set_alloc_hint(int fd, uint64_t val)
  20 {
  21   struct fsxattr fsx;
  22   struct stat sb;
  23   int ret;
  24
  25   if (fstat(fd, &sb) < 0) {
  26     ret = -errno;
  27     return ret;
  28   }
  29   if (!S_ISREG(sb.st_mode)) {
  30     return -EINVAL;
  31   }
  32
  33   if (ioctl(fd, XFS_IOC_FSGETXATTR, &fsx) < 0) {
  34     ret = -errno;
  35     return ret;
  36   }
  37
  38   // already set?
  39   if ((fsx.fsx_xflags & XFS_XFLAG_EXTSIZE) && fsx.fsx_extsize == val)
  40     return 0;
  41
  42   // xfs won't change extent size if any extents are allocated
  43   if (fsx.fsx_nextents != 0)
  44     return 0;
  45
  46   fsx.fsx_xflags |= XFS_XFLAG_EXTSIZE;
  47   fsx.fsx_extsize = val;
  48
  49   if (ioctl(fd, XFS_IOC_FSSETXATTR, &fsx) < 0) {
  50     ret = -errno;
  51     return ret;
  52   }
  53
  54   return 0;
  55 }