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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 Inktank, Inc
*
* 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 "XfsFileStoreBackend.h"
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/utsname.h>
#include <xfs/xfs.h>
#include "common/errno.h"
#include "common/linux_version.h"
#include "include/ceph_assert.h"
#include "include/compat.h"
#define dout_context cct()
#define dout_subsys ceph_subsys_filestore
#undef dout_prefix
#define dout_prefix *_dout << "xfsfilestorebackend(" << get_basedir_path() << ") "
XfsFileStoreBackend::XfsFileStoreBackend(FileStore *fs):
GenericFileStoreBackend(fs), m_has_extsize(false) { }
/*
* Set extsize attr on a file to val. Should be a free-standing
* function, but dout_prefix expanding to a call to get_basedir_path()
* protected member function won't let it.
*/
int XfsFileStoreBackend::set_extsize(int fd, unsigned int val)
{
struct fsxattr fsx;
struct stat sb;
int ret;
if (fstat(fd, &sb) < 0) {
ret = -errno;
dout(0) << "set_extsize: fstat: " << cpp_strerror(ret) << dendl;
return ret;
}
if (!S_ISREG(sb.st_mode)) {
dout(0) << "set_extsize: invalid target file type" << dendl;
return -EINVAL;
}
if (ioctl(fd, XFS_IOC_FSGETXATTR, &fsx) < 0) {
ret = -errno;
dout(0) << "set_extsize: FSGETXATTR: " << cpp_strerror(ret) << dendl;
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;
dout(0) << "set_extsize: FSSETXATTR: " << cpp_strerror(ret) << dendl;
return ret;
}
return 0;
}
int XfsFileStoreBackend::detect_features()
{
int ret;
ret = GenericFileStoreBackend::detect_features();
if (ret < 0)
return ret;
// extsize?
int fd = ::openat(get_basedir_fd(), "extsize_test", O_CREAT|O_WRONLY, 0600);
if (fd < 0) {
ret = -errno;
dout(0) << "detect_feature: failed to create test file for extsize attr: "
<< cpp_strerror(ret) << dendl;
goto out;
}
if (::unlinkat(get_basedir_fd(), "extsize_test", 0) < 0) {
ret = -errno;
dout(0) << "detect_feature: failed to unlink test file for extsize attr: "
<< cpp_strerror(ret) << dendl;
goto out_close;
}
if (cct()->_conf->filestore_xfs_extsize) {
ret = set_extsize(fd, 1U << 15); // a few pages
if (ret) {
ret = 0;
dout(0) << "detect_feature: failed to set test file extsize, assuming extsize is NOT supported" << dendl;
goto out_close;
}
// make sure we have 3.5 or newer, which includes this fix
// aff3a9edb7080f69f07fe76a8bd089b3dfa4cb5d
// for this set_extsize bug
// http://oss.sgi.com/bugzilla/show_bug.cgi?id=874
int ver = get_linux_version();
if (ver == 0) {
dout(0) << __func__ << ": couldn't verify extsize not buggy, disabling extsize" << dendl;
m_has_extsize = false;
} else if (ver < KERNEL_VERSION(3, 5, 0)) {
dout(0) << __func__ << ": disabling extsize, your kernel < 3.5 and has buggy extsize ioctl" << dendl;
m_has_extsize = false;
} else {
dout(0) << __func__ << ": extsize is supported and your kernel >= 3.5" << dendl;
m_has_extsize = true;
}
} else {
dout(0) << "detect_feature: extsize is disabled by conf" << dendl;
}
out_close:
TEMP_FAILURE_RETRY(::close(fd));
out:
return ret;
}
int XfsFileStoreBackend::set_alloc_hint(int fd, uint64_t hint)
{
if (!m_has_extsize)
return -EOPNOTSUPP;
ceph_assert(hint < UINT_MAX);
return set_extsize(fd, hint);
}
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