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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 Red Hat
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "XFS.h"
#include <xfs/xfs.h>
int XFS::set_alloc_hint(int fd, uint64_t val)
{
struct fsxattr fsx;
struct stat sb;
int ret;
if (fstat(fd, &sb) < 0) {
ret = -errno;
return ret;
}
if (!S_ISREG(sb.st_mode)) {
return -EINVAL;
}
if (ioctl(fd, XFS_IOC_FSGETXATTR, &fsx) < 0) {
ret = -errno;
return ret;
}
// already set?
if ((fsx.fsx_xflags & XFS_XFLAG_EXTSIZE) && fsx.fsx_extsize == val)
return 0;
// xfs won't change extent size if any extents are allocated
if (fsx.fsx_nextents != 0)
return 0;
fsx.fsx_xflags |= XFS_XFLAG_EXTSIZE;
fsx.fsx_extsize = val;
if (ioctl(fd, XFS_IOC_FSSETXATTR, &fsx) < 0) {
ret = -errno;
return ret;
}
return 0;
}
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