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tdeadmin/kdat/TapeDrive.cpp

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// KDat - a tar-based DAT archiver
// Copyright (C) 1998-2000 Sean Vyain, svyain@mail.tds.net
// Copyright (C) 2001-2002 Lawrence Widman, kdat@cardiothink.com
//
// 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 <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mtio.h>
#include <unistd.h>
#include <time.h>
#include <tqfile.h>
#include <kmessagebox.h>
#include <kapplication.h>
#include <klocale.h>
#include "KDatMainWindow.h"
#include "Options.h"
#include "Tape.h"
#include "TapeManager.h"
#include "TapeDrive.h"
#include "kdat.h"
#include "TapeDrive.moc"
TapeDrive* TapeDrive::_instance = 0;
TapeDrive* TapeDrive::instance()
{
if ( !_instance ) {
_instance = new TapeDrive();
}
return _instance;
}
TapeDrive::TapeDrive()
: _fd ( -1 ),
_readOnly( TRUE ),
_tape( 0 ),
_writeBuf( 0 ),
_readBuf( 0 ),
_writeBufIdx( 0 ),
_readBufIdx( Options::instance()->getTapeBlockSize() )
{
setBlockSize( Options::instance()->getTapeBlockSize() );
_writeBuf = new char[ Options::instance()->getTapeBlockSize() ];
_readBuf = new char[ Options::instance()->getTapeBlockSize() ];
}
TapeDrive::~TapeDrive()
{
if ( Options::instance()->getLockOnMount() ) {
unlock();
}
delete [] _writeBuf;
delete [] _readBuf;
}
void TapeDrive::flush()
{
_readBufIdx = Options::instance()->getTapeBlockSize();
if ( _writeBufIdx <= 0 ) {
return;
}
memset( _writeBuf + _writeBufIdx, 0, Options::instance()->getTapeBlockSize() - _writeBufIdx );
int ret = ::write( _fd, _writeBuf, Options::instance()->getTapeBlockSize() );
if ( ret < 0 ) {
printf( "TapeDrive::flush() -- write failed!\n" );
}
_writeBufIdx = 0;
}
bool TapeDrive::load()
{
if ( _fd < 0 ) {
return FALSE;
}
#ifdef MTLOAD
struct mtop tapeOp;
tapeOp.mt_op = MTLOAD;
tapeOp.mt_count = 1;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::lock() -- ioctl( MTLOAD ) failed!\n" );
}
return ret >= 0;
#else
return TRUE;
#endif
}
bool TapeDrive::lock()
{
if ( _fd < 0 ) {
return FALSE;
}
#ifdef MTLOCK
struct mtop tapeOp;
tapeOp.mt_op = MTLOCK;
tapeOp.mt_count = 1;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::lock() -- ioctl( MTLOCK ) failed!\n" );
}
return ret >= 0;
#else
return TRUE;
#endif
}
bool TapeDrive::unlock()
{
if ( _fd < 0 ) {
return FALSE;
}
#ifdef MTUNLOCK
struct mtop tapeOp;
tapeOp.mt_op = MTUNLOCK;
tapeOp.mt_count = 1;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::unlock() -- ioctl( MTUNLOCK ) failed!\n" );
}
return ret >= 0;
#else
return TRUE;
#endif
}
bool TapeDrive::isReadOnly()
{
return _readOnly;
}
bool TapeDrive::isTapePresent()
{
open();
if ( _fd < 0 ) {
return FALSE;
}
// Get tape status.
struct mtget tapeStatus;
int ret = ioctl( _fd, MTIOCGET, &tapeStatus );
if ( ret < 0 ) {
return FALSE;
}
// Check for the presence of a tape.
// if ( !GMT_DR_OPEN( tapeStatus.mt_gstat ) ) {
if ( GMT_ONLINE( tapeStatus.mt_gstat ) ) {
// Lock the tape drive door.
//struct mtop tapeOp;
//tapeOp.mt_op = MTLOCK;
//tapeOp.mt_count = 1;
//int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
//if ( ret < 0 ) {
// printf( "TapeDrive::isTapePresent() -- ioctl( MTLOCK ) failed!\n" );
//}
if ( _readOnly ) {
emit sigStatus( i18n( "Tape mounted readonly." ) );
} else {
emit sigStatus( i18n( "Tape mounted read/write." ) );
}
return TRUE;
} else {
return FALSE;
}
}
void TapeDrive::eject()
{
if ( _fd < 0 ) {
return;
}
flush();
struct mtop tapeOp;
tapeOp.mt_op = MTOFFL;
tapeOp.mt_count = 1;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::ejectTape() -- ioctl( MTOFFL ) failed!\n" );
}
}
Tape* TapeDrive::readHeader()
{
_tape = NULL;
// Rewind tape.
emit sigStatus( "Rewinding tape..." );
if ( !rewind() ) {
KMessageBox::error( KDatMainWindow::getInstance(), i18n( "Rewinding tape failed." ));
return NULL;
}
// KDat magic string.
emit sigStatus( i18n( "Reading magic string..." ) );
char magic[9];
if ( read( magic, 9 ) < 9 ) {
KMessageBox::error( KDatMainWindow::getInstance(), i18n( "Reading magic string failed." ));
return NULL;
}
if ( strncmp( "KDatMAGIC", magic, 9 ) ) {
// Bad magic.
return NULL;
}
// Read version number.
emit sigStatus( i18n( "Reading version number..." ) );
int version;
if ( read( (char*)&version, 4 ) < 4 ) {
KMessageBox::error( KDatMainWindow::getInstance(), i18n( "Reading version number failed." ));
return NULL;
}
if ( version > KDAT_TAPE_HEADER_VERSION ) {
KMessageBox::information( KDatMainWindow::getInstance(), i18n( "Tape was formatted by a more recent version of KDat. Consider upgrading." ));
}
// Read tape ID.
emit sigStatus( i18n( "Reading tape ID..." ) );
int len;
if ( read( (char*)&len, 4 ) < 4 ) {
KMessageBox::error( KDatMainWindow::getInstance(), i18n( "Reading tape ID length failed." ));
return NULL;
}
char* tapeID = new char[len];
if ( read( tapeID, len ) < len ) {
KMessageBox::error( KDatMainWindow::getInstance(), i18n( "Reading tape ID failed." ));
delete [] tapeID;
return NULL;
}
_tape = TapeManager::instance()->findTape( tapeID );
delete [] tapeID;
return _tape;
}
bool TapeDrive::rewind()
{
if ( _fd < 0 ) {
return FALSE;
}
flush();
struct mtop tapeOp;
tapeOp.mt_op = MTREW;
tapeOp.mt_count = 1;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::rewind() -- ioctl( MTREW ) failed!\n" );
}
return ret >= 0;
}
int TapeDrive::getFile()
{
if ( _fd < 0 ) {
return -1;
}
struct mtget tapePos;
if ( ioctl( _fd, MTIOCGET, &tapePos ) < 0 ) {
printf( "TapeDrive::getFile() -- ioctl( MTIOCGET ) failed!\n" );
return -1;
}
return tapePos.mt_fileno;
}
int TapeDrive::getBlock()
{
if ( _fd < 0 ) {
return -1;
}
struct mtget tapePos;
if ( ioctl( _fd, MTIOCGET, &tapePos ) < 0 ) {
printf( "TapeDrive::getBlock() -- ioctl( MTIOCGET ) failed!\n" );
return -1;
}
//%%% I don't think this makes sense anymore because the tape buffer size == the tape block size.
// Need to subtract off the blocks that the application has not "read" yet.
//int unread = ( Options::instance()->getTapeBlockSize() - _readBufIdx ) / Options::instance()->getTapeBlockSize();
//return tapePos.mt_blkno - unread;
return tapePos.mt_blkno;
}
bool TapeDrive::nextFile( int count )
{
if ( _fd < 0 ) {
return FALSE;
}
flush();
struct mtop tapeOp;
tapeOp.mt_op = MTFSF;
tapeOp.mt_count = count;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::nextFile() -- ioctl( MTFSF ) failed!\n" );
}
return ret >= 0;
}
bool TapeDrive::prevFile( int count )
{
if ( _fd < 0 ) {
return FALSE;
}
flush();
struct mtop tapeOp;
tapeOp.mt_op = MTBSF;
tapeOp.mt_count = count;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::prevFile() -- ioctl( MTBSF ) failed!\n" );
}
return ret >= 0;
}
bool TapeDrive::nextRecord( int count )
{
if ( _fd < 0 ) {
return FALSE;
}
flush();
struct mtop tapeOp;
tapeOp.mt_op = MTFSR;
tapeOp.mt_count = count;
bool status = ( ioctl( _fd, MTIOCTOP, &tapeOp ) >= 0 );
if ( !status ) {
// Try reading count * TapeBlockSize bytes.
char *buf = new char[Options::instance()->getTapeBlockSize()];
int bytes = count * Options::instance()->getTapeBlockSize();
int ret;
while ( bytes > 0 ) {
ret = read( buf, bytes > Options::instance()->getTapeBlockSize() ? Options::instance()->getTapeBlockSize() : bytes );
if ( ret <= 0 ) {
status = FALSE;
break;
}
bytes -= ret;
}
delete [] buf;
status = TRUE;
}
return status;
}
bool TapeDrive::prevRecord( int count )
{
if ( _fd < 0 ) {
return FALSE;
}
flush();
struct mtop tapeOp;
tapeOp.mt_op = MTBSR;
tapeOp.mt_count = count;
int ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::prevRecord() -- ioctl( MTBSR ) failed!\n" );
}
return ret >= 0;
}
void TapeDrive::close()
{
if ( _fd < 0 ) {
return;
}
flush();
::close( _fd );
}
void TapeDrive::open()
{
close();
// Open the tape device.
_fd = ::open( TQFile::encodeName(Options::instance()->getTapeDevice()), O_RDWR );
if ( _fd < 0 ) {
_fd = ::open( TQFile::encodeName(Options::instance()->getTapeDevice()), O_RDONLY );
if ( _fd < 0 ) {
return;
} else {
_readOnly = TRUE;
}
} else {
_readOnly = FALSE;
}
// Set the tape block size after the device is opened.
setBlockSize( Options::instance()->getTapeBlockSize() );
}
int TapeDrive::read( char* buf, int len )
{
if ( _fd < 0 ) {
return -1;
}
//printf( "TapeDrive::read() -- _readBufIdx = %d\n", _readBufIdx );
int remain = Options::instance()->getTapeBlockSize() - _readBufIdx;
if ( len <= remain ) {
memcpy( buf, _readBuf + _readBufIdx, len );
_readBufIdx += len;
} else {
memcpy( buf, _readBuf + _readBufIdx, remain );
_readBufIdx = Options::instance()->getTapeBlockSize();
int need = Options::instance()->getTapeBlockSize();
int count = 0;
while ( need > 0 ) {
int ret = ::read( _fd, _readBuf + count, Options::instance()->getTapeBlockSize() );
if ( ret <= 0 ) return ret;
need -= ret;
count += ret;
}
memcpy( buf + remain, _readBuf, len - remain );
_readBufIdx = len - remain;
}
//int ret = ::read( _fd, buf, len );
return len;
}
int TapeDrive::write( const char* buf, int len )
{
if ( _fd < 0 ) {
return -1;
}
int bufIdx = 0;
while ( len + _writeBufIdx - bufIdx > Options::instance()->getTapeBlockSize() ) {
memcpy( _writeBuf + _writeBufIdx, buf + bufIdx, Options::instance()->getTapeBlockSize() - _writeBufIdx );
int ret = ::write( _fd, _writeBuf, Options::instance()->getTapeBlockSize() );
if ( ret < 0 ) {
printf( "TapeDrive::write() -- write failed!\n" );
return ret;
}
bufIdx += Options::instance()->getTapeBlockSize() - _writeBufIdx;
_writeBufIdx = 0;
}
if ( bufIdx < len ) {
memcpy( _writeBuf + _writeBufIdx, buf + bufIdx, len - bufIdx );
_writeBufIdx += len - bufIdx;
}
return len;
}
bool TapeDrive::seek( int file, int tarBlock )
{
// printf( "TapeDrive::seek() -- file = %d, block = %d\n", file, tarBlock );
if ( _fd < 0 ) {
printf( "bailing1\n" );
return FALSE;
}
flush();
// Go to the desired archive.
emit sigStatus( i18n( "Skipping to archive..." ) );
int curFile = getFile();
// printf( "TapeDrive::seek() -- curFile = %d\n", curFile );
if ( curFile < 0 ) {
emit sigStatus( i18n( "Rewinding tape..." ) );
rewind();
curFile = 0;
}
int fileDiff = file - curFile;
if ( fileDiff > 0 ) {
nextFile( fileDiff );
} else if ( fileDiff < 0 ) {
prevFile( -fileDiff + 1 );
nextFile( 1 );
}
int tapeBlock = tarBlock / ( Options::instance()->getTapeBlockSize() / 512 );
// printf( "TapeDrive::seek() -- desired tapeBlock = %d\n", tapeBlock );
// Go to the desired record within the archive.
emit sigStatus( i18n( "Skipping to block..." ) );
int curBlock = getBlock();
// printf( "TapeDrive::seek() -- curBlock = %d\n", curBlock );
if ( curBlock < 0 ) {
emit sigStatus( i18n( "Rewinding tape..." ) );
rewind();
nextFile( file );
if ( ( curBlock = getBlock() ) < 0 ) {
printf( "bailing2\n" );
return FALSE;
}
}
if ( tapeBlock > curBlock ) {
if ( !nextRecord( tapeBlock - curBlock ) ) {
printf( "bailing3\n" );
return FALSE;
}
} else if ( tapeBlock < curBlock ) {
if ( tapeBlock == 0 ) {
if ( !prevFile( 1 ) ) {
printf( "bailing6\n" );
return FALSE;
}
if ( !nextFile( 1 ) ) {
printf( "bailing7\n" );
return FALSE;
}
} else {
if ( !prevRecord( curBlock - tapeBlock + 1 ) ) {
printf( "bailing4\n" );
return FALSE;
}
if ( !nextRecord( 1 ) ) {
printf( "bailing5\n" );
return FALSE;
}
}
}
// printf( "TapeDrive::seek() -- now: file = %d, block = %d\n", getFile(), getBlock() );
// If tapeBlockSize > 512, we may need to skip some tar blocks.
// printf ( "TapeDrive::seek() -- skipping %d tar blocks.\n", tarBlock - tapeBlock * ( Options::instance()->getTapeBlockSize() / 512 ) );
char *buf = new char[ Options::instance()->getTapeBlockSize() ];
read( buf, 512 * ( tarBlock - tapeBlock * ( Options::instance()->getTapeBlockSize() / 512 ) ) );
delete [] buf;
return TRUE;
}
bool TapeDrive::pastEOF()
{
if ( _fd < 0 ) {
return FALSE;
}
struct mtget tapeStatus;
if ( ioctl( _fd, MTIOCGET, &tapeStatus ) < 0 ) {
printf( "TapeDrive::pastEOF() -- ioctl( MTIOCGET ) failed!\n" );
return FALSE;
}
return GMT_EOF( tapeStatus.mt_gstat );
}
bool TapeDrive::setBlockSize( int blockSize )
{
if ( _fd < 0 ) {
return FALSE;
}
#ifdef MTSETBLK
flush();
int ret = 0;
if ( Options::instance()->getVariableBlockSize() ) {
struct mtop tapeOp;
tapeOp.mt_op = MTSETBLK;
tapeOp.mt_count = blockSize;
ret = ioctl( _fd, MTIOCTOP, &tapeOp );
if ( ret < 0 ) {
printf( "TapeDrive::setBlockSize() -- ioctl( MTSETBLK ) failed!\n" );
}
}
_readBufIdx = blockSize;
_writeBufIdx = 0;
delete [] _readBuf;
_readBuf = new char[ blockSize ];
delete [] _writeBuf;
_writeBuf = new char[ blockSize ];
return ret >= 0;
#else
// some systems (e.g. HP-UX) encode block size into device file names
// so setting the block size by software does not make sense
return TRUE;
#endif
}
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