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xfs.cpp

/***************************************************************************
 *   Copyright (C) 2008 by Volker Lanz <vl@fidra.de>                       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
 ***************************************************************************/

#include "fs/xfs.h"

#include "util/externalcommand.h"
#include "util/capacity.h"
#include "util/report.h"

#include <QString>
#include <QStringList>
#include <QRegExp>

#include <ktempdir.h>
#include <klocale.h>

#include <unistd.h>

namespace FS
{
      FileSystem::SupportType xfs::m_GetUsed = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_GetLabel = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_Create = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_Grow = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_Move = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_Check = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_Copy = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_Backup = FileSystem::SupportNone;
      FileSystem::SupportType xfs::m_SetLabel = FileSystem::SupportNone;

      xfs::xfs(qint64 firstsector, qint64 lastsector, qint64 sectorsused, const QString& label) :
            FileSystem(firstsector, lastsector, sectorsused, label, FileSystem::Xfs)
      {
      }

      void xfs::init()
      {
            m_SetLabel = m_GetLabel = m_GetUsed = findExternal("xfs_db") ? SupportExternal : SupportNone;
            m_Create = findExternal("mkfs.xfs") ? SupportExternal : SupportNone;

            m_Check = findExternal("xfs_repair") ? SupportExternal : SupportNone;
            m_Grow = (findExternal("xfs_growfs", QStringList() << "-V") && m_Check != SupportNone) ? SupportExternal : SupportNone;
            m_Copy = findExternal("xfs_copy") ? SupportExternal : SupportNone;
            m_Move = (m_Check != SupportNone) ? SupportInternal : SupportNone;
            m_Backup = SupportInternal;
      }

00064       qint64 xfs::minCapacity() const
      {
            return 32 * Capacity::unitFactor(Capacity::Byte, Capacity::MiB);
      }
      
00069       qint64 xfs::readUsedCapacity(const QString& deviceNode) const
      {
            ExternalCommand cmd("xfs_db", QStringList() << "-c" << "sb 0" << "-c" << "print" << deviceNode);

            if (cmd.run())
            {
                  qint64 dBlocks = -1;
                  QRegExp rxDBlocks("dblocks = (\\d+)");

                  if (rxDBlocks.indexIn(cmd.output()) != -1)
                        dBlocks = rxDBlocks.cap(1).toLongLong();

                  qint64 blockSize = -1;
                  QRegExp rxBlockSize("blocksize = (\\d+)");

                  if (rxBlockSize.indexIn(cmd.output()) != -1)
                        blockSize = rxBlockSize.cap(1).toLongLong();

                  qint64 fdBlocks = -1;
                  QRegExp rxFdBlocks("fdblocks = (\\d+)");

                  if (rxFdBlocks.indexIn(cmd.output()) != -1)
                        fdBlocks = rxFdBlocks.cap(1).toLongLong();

                  if (dBlocks > -1 && blockSize > -1 && fdBlocks > -1)
                        return (dBlocks - fdBlocks) * blockSize;
            }

            return -1;
      }

00100       QString xfs::readLabel(const QString& deviceNode) const
      {
            ExternalCommand cmd("xfs_db", QStringList() << "-c" << "sb 0" << "-c" << "label" << deviceNode);

            if (cmd.run())
            {
                  QRegExp rxLabel("label = \"(\\w+)\"");

                  if (rxLabel.indexIn(cmd.output()) != -1)
                        return rxLabel.cap(1);
            }

            return QString();
      }

00115       bool xfs::writeLabel(Report& report, const QString& deviceNode, const QString& newLabel)
      {
            return ExternalCommand(report, "xfs_db", QStringList() << "-x" << "-c" << "sb 0" << "-c" << QString("label " + newLabel) << deviceNode).run(-1);
      }

00120       bool xfs::check(Report& report, const QString& deviceNode) const
      {
            ExternalCommand cmd(report, "xfs_repair", QStringList() << "-v" << deviceNode);
            return cmd.run(-1) && cmd.exitCode() == 0;
      }

00126       bool xfs::create(Report& report, const QString& deviceNode) const
      {
            return ExternalCommand(report, "mkfs.xfs", QStringList() << "-f" << deviceNode).run(-1);
      }

00131       bool xfs::copy(Report& report, const QString& targetDeviceNode, const QString& sourceDeviceNode) const
      {
            ExternalCommand cmd(report, "xfs_copy", QStringList() << sourceDeviceNode << targetDeviceNode);

            // xfs_copy behaves a little strangely. It apparently kills itself at the end of main, causing QProcess
            // to report that it crashed.
            // See http://oss.sgi.com/archives/xfs/2004-11/msg00169.html
            // So we cannot rely on QProcess::exitStatus() and thus not on ExternalCommand::run() returning true.

            cmd.run(-1);
            return cmd.exitCode() == 0;
      }

00144       bool xfs::resize(Report& report, const QString& deviceNode, qint64) const
      {
            KTempDir tempDir;
            if (!tempDir.exists())
            {
                  report.line() << i18nc("@info/plain", "Resizing XFS file system on partition <filename>%1</filename> failed: Could not create temp dir.", deviceNode);
                  return false;
            }

            bool rval = false;

            ExternalCommand mountCmd(report, "mount", QStringList() << "-v" << "-t" << "xfs" << deviceNode << tempDir.name());
            
            if (mountCmd.run(-1))
            {
                  ExternalCommand resizeCmd(report, "xfs_growfs", QStringList() << tempDir.name());
            
                  if (resizeCmd.run(-1))
                        rval = true;
                  else
                        report.line() << i18nc("@info/plain", "Resizing XFS file system on partition <filename>%1</filename> failed: xfs_growfs failed.", deviceNode);
                  
                  ExternalCommand unmountCmd(report, "umount", QStringList() << tempDir.name());

                  if (!unmountCmd.run(-1))
                        report.line() << i18nc("@info/plain", "Warning: Resizing XFS file system on partition <filename>%1</filename>: Unmount failed.", deviceNode);
            }
            else
                  report.line() << i18nc("@info/plain", "Resizing XFS file system on partition <filename>%1</filename> failed: Initial mount failed.", deviceNode);
            
            return rval;
      }
}

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