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jfs.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/jfs.h"

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

#include <QStringList>
#include <QRegExp>

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

#include <unistd.h>

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

      jfs::jfs(qint64 firstsector, qint64 lastsector, qint64 sectorsused, const QString& label) :
            FileSystem(firstsector, lastsector, sectorsused, label, FileSystem::Jfs)
      {
      }

      void jfs::init()
      {
            m_GetUsed = findExternal("jfs_debugfs") ? SupportExternal : SupportNone;
            m_SetLabel = m_GetLabel = findExternal("jfs_tune", QStringList() << "-V") ? SupportExternal : SupportNone;
            m_Create = findExternal("mkfs.jfs", QStringList() << "-V") ? SupportExternal : SupportNone;
            m_Grow = m_Check = findExternal("fsck.jfs", QStringList() << "-V") ? SupportExternal : SupportNone;
            m_Copy = m_Move = (m_Check != SupportNone) ? SupportInternal : SupportNone;
            m_Backup = SupportInternal;
      }

00061       qint64 jfs::minCapacity() const
      {
            return 16 * Capacity::unitFactor(Capacity::Byte, Capacity::MiB);
      }
      
00066       qint64 jfs::readUsedCapacity(const QString& deviceNode) const
      {
            ExternalCommand cmd("jfs_debugfs", QStringList() << deviceNode);

            if (cmd.start() && cmd.write("dm") == 2 && cmd.waitFor())
            {
                  qint64 blockSize = -1;
                  QRegExp rxBlockSize("Block Size: (\\d+)");

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

                  qint64 nBlocks = -1;
                  QRegExp rxnBlocks("dn_mapsize:\\s+0x([0-9a-f]+)");

                  bool ok = false;
                  if (rxnBlocks.indexIn(cmd.output()) != -1)
                  {
                        nBlocks = rxnBlocks.cap(1).toLongLong(&ok, 16);
                        if (!ok)
                              nBlocks = -1;
                  }
                  
                  qint64 nFree = -1;
                  QRegExp rxnFree("dn_nfree:\\s+0x([0-9a-f]+)");

                  if (rxnFree.indexIn(cmd.output()) != -1)
                  {
                        nFree = rxnFree.cap(1).toLongLong(&ok, 16);
                        if (!ok)
                              nFree = -1;
                  }

                  if (nBlocks > -1 && blockSize > -1 && nFree > -1)
                        return (nBlocks - nFree) * blockSize;
            }

            return -1;
      }

00106       QString jfs::readLabel(const QString& deviceNode) const
      {
            ExternalCommand cmd("jfs_tune", QStringList() << "-l" << deviceNode);

            if (cmd.run())
            {
                  QRegExp rxLabel("Volume label:\\s+'(\\w+)'");

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

            return QString();
      }

00121       bool jfs::writeLabel(Report& report, const QString& deviceNode, const QString& newLabel)
      {
            return ExternalCommand(report, "jfs_tune", QStringList() << "-L" << newLabel << deviceNode).run(-1);
      }

00126       bool jfs::check(Report& report, const QString& deviceNode) const
      {
            ExternalCommand cmd(report, "fsck.jfs", QStringList() << "-f" << deviceNode);
            return cmd.run(-1) && (cmd.exitCode() == 0 || cmd.exitCode() == 1);
      }

00132       bool jfs::create(Report& report, const QString& deviceNode) const
      {
            return ExternalCommand(report, "mkfs.jfs", QStringList() << "-q" << deviceNode).run(-1);
      }
      
00137       bool jfs::resize(Report& report, const QString& deviceNode, qint64) const
      {
            KTempDir tempDir;
            if (!tempDir.exists())
            {
                  report.line() << i18nc("@info/plain", "Resizing JFS 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" << "jfs" << deviceNode << tempDir.name());
            
            if (mountCmd.run(-1))
            {
                  ExternalCommand resizeMountCmd(report, "mount", QStringList() << "-v" << "-t" << "jfs" << "-o" << "remount,resize" << deviceNode << tempDir.name());
            
                  if (resizeMountCmd.run(-1))
                        rval = true;
                  else
                        report.line() << i18nc("@info/plain", "Resizing JFS file system on partition <filename>%1</filename> failed: Remount failed.", deviceNode);
                        
                  ExternalCommand unmountCmd(report, "umount", QStringList() << tempDir.name());

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

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