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dvdisaster/scsi-linux.c
TANIGUCHI Takaki 9ad5d25d65 New upstream version 0.79.5
2017-02-02 22:24:37 +09:00

350 lines
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/* dvdisaster: Additional error correction for optical media.
* Copyright (C) 2004-2015 Carsten Gnoerlich.
*
* Email: carsten@dvdisaster.org -or- cgnoerlich@fsfe.org
* Project homepage: http://www.dvdisaster.org
*
* This file is part of dvdisaster.
*
* dvdisaster 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 3 of the License, or
* (at your option) any later version.
*
* dvdisaster 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 dvdisaster. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dvdisaster.h"
#include "scsi-layer.h"
#include "udf.h"
/***
*** The GNU/Linux SCSI wrapper. Uses the uniform CDROM driver. Kernel 2.6.x recommended.
***/
#ifdef SYS_LINUX
#include <linux/param.h>
#include <scsi/sg.h>
char* DefaultDevice()
{ DeviceHandle *dh;
GDir *dir;
const char* dev;
int dev_type;
/* As a convenience, add the simulated drive first. */
InitSimulatedCD();
/* Now probe the physical drives. */
dir = g_dir_open("/dev", 0, NULL);
if(!dir)
{ PrintLog(_("Can not access /dev for devices\n"
"No drives will be pre-selected.\n"));
return g_strdup("/dev/cdrom");
}
dh = g_malloc(sizeof(DeviceHandle));
while((dev = g_dir_read_name(dir)))
{
if(!strncmp(dev,"scd",3) || !strncmp(dev,"sr", 2))
{ char buf[80];
sprintf(buf,"/dev/%s", dev);
memset(dh, 0, sizeof(DeviceHandle));
dh->fd = open(buf, O_RDWR | O_NONBLOCK);
dh->device = buf;
if(dh->fd < 0) /* device not even present */
continue;
dev_type = InquireDevice(dh, 1);
close(dh->fd);
if(dev_type != 5) /* not a CD/DVD ROM */
continue;
g_ptr_array_add(Closure->deviceNodes, g_strdup(buf));
sprintf(buf, "%s (/dev/%s)", dh->devinfo, dev);
g_ptr_array_add(Closure->deviceNames, g_strdup(buf));
}
}
g_dir_close(dir);
g_free(dh);
if(Closure->deviceNodes->len)
return g_strdup(g_ptr_array_index(Closure->deviceNodes, 0));
else
{ PrintLog(_("No optical drives found in /dev.\n"
"No drives will be pre-selected.\n"));
return g_strdup("/dev/cdrom");
}
}
DeviceHandle* OpenDevice(char *device)
{ DeviceHandle *dh;
dh = g_malloc0(sizeof(DeviceHandle));
dh->senseSize = sizeof(Sense);
if(!strcmp(device, "sim-cd"))
{ if(!Closure->simulateCD) /* can happen via resource file / last-device */
{ g_free(dh);
return NULL;
}
dh->simImage = LargeOpen(Closure->simulateCD, O_RDONLY, IMG_PERMS);
if(!dh->simImage)
{ g_free(dh);
Stop(_("Could not open %s: %s"), Closure->simulateCD, strerror(errno));
return NULL;
}
}
else
{ dh->fd = open(device, O_RDWR | O_NONBLOCK);
if(dh->fd < 0)
{ g_free(dh);
Stop(_("Could not open %s: %s"),device, strerror(errno));
return NULL;
}
}
dh->device = g_strdup(device);
return dh;
}
void CloseDevice(DeviceHandle *dh)
{
if(dh->simImage)
LargeClose(dh->simImage);
if(dh->canReadDefective)
SetRawMode(dh, MODE_PAGE_UNSET);
if(dh->rawBuffer)
FreeRawBuffer(dh->rawBuffer);
if(dh->fd)
close(dh->fd);
if(dh->device)
g_free(dh->device);
if(dh->typeDescr)
g_free(dh->typeDescr);
if(dh->mediumDescr)
g_free(dh->mediumDescr);
if(dh->defects)
FreeBitmap(dh->defects);
g_free(dh);
}
//#define ASSERT_CDB_LENGTH
#ifdef ASSERT_CDB_LENGTH
static void assert_cdb_length(unsigned char cdb, int cdb_size, int expected_size)
{
if(cdb_size != expected_size)
PrintLog("SendPacket(): Wrong size %d for opcode %0x (expected %d)\n",
cdb_size, cdb, expected_size);
}
static void assert_cdb_direction(unsigned char cdb, int expected, int given)
{
if(expected != given)
PrintLog("SendPacket(): Wrong data direction %d for opcode %0x (expected %d)\n",
given, cdb, expected);
}
static void test_cdb(unsigned char *cdb, int cdb_size, int direction)
{
switch(cdb[0])
{ case 0x00: assert_cdb_length(cdb[0], cdb_size, 6); /* TEST UNIT READY */
assert_cdb_direction(cdb[0], DATA_NONE, direction);
break;
case 0x12: assert_cdb_length(cdb[0], cdb_size, 6); /* INQUIRY */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x1b: assert_cdb_length(cdb[0], cdb_size, 6); /* START STOP */
assert_cdb_direction(cdb[0], DATA_NONE, direction);
break;
case 0x1e: assert_cdb_length(cdb[0], cdb_size, 6); /* PREVENT ALLOW MEDIUM REMOVAL */
assert_cdb_direction(cdb[0], DATA_NONE, direction);
break;
case 0x23: assert_cdb_length(cdb[0], cdb_size, 10); /* READ FORMAT CAPACITIES */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x25: assert_cdb_length(cdb[0], cdb_size, 10); /* READ CAPACITY */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x28: assert_cdb_length(cdb[0], cdb_size, 10); /* READ(10) */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x43: assert_cdb_length(cdb[0], cdb_size, 10); /* READ TOC/PMA/ATIP */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x46: assert_cdb_length(cdb[0], cdb_size, 10); /* GET CONFIGURATION */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x51: assert_cdb_length(cdb[0], cdb_size, 10); /* READ DISC INFORMATION */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x52: assert_cdb_length(cdb[0], cdb_size, 10); /* READ TRACK INFORMATION */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0x55: assert_cdb_length(cdb[0], cdb_size, 10); /* MODE SELECT */
assert_cdb_direction(cdb[0], DATA_WRITE, direction);
break;
case 0x5a: assert_cdb_length(cdb[0], cdb_size, 10); /* MODE SENSE */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0xad: assert_cdb_length(cdb[0], cdb_size, 12); /* READ DVD STRUCTURE */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
case 0xbe: assert_cdb_length(cdb[0], cdb_size, 12); /* READ CD */
assert_cdb_direction(cdb[0], DATA_READ, direction);
break;
default:
PrintLog("SendPacket(): Unknown opcode %0x\n", cdb[0]);
}
}
#endif
/*
* The CDROM ioctl() interface has been used since the first dvdisaster release.
* However with recent 2.6 kernels it seems to become outdated - several parallel
* SCSI cards are already exhibiting failures using this interface.
* Starting with dvdisaster 0.79.3, the SG_IO interface has become
* the default now. You can revert back to old behaviour using --driver=cdrom.
*/
static int send_packet_cdrom(DeviceHandle *dh, unsigned char *cmd, int cdb_size, unsigned char *buf, int size, Sense *sense, int data_mode)
{ struct cdrom_generic_command cgc;
#ifdef ASSERT_CDB_LENGTH
test_cdb(cmd, cdb_size, data_mode);
#endif
memset(&cgc, 0, sizeof(cgc));
memcpy(cgc.cmd, cmd, MAX_CDB_SIZE); /* GNU/Linux ignores the CDB size */
cgc.buffer = buf;
cgc.buflen = size;
cgc.sense = (struct request_sense*)sense;
cgc.timeout = 10*60*HZ; /* 10 minutes; a timeout hangs newer kernels */
switch(data_mode)
{ case DATA_READ:
cgc.data_direction = CGC_DATA_READ;
break;
case DATA_WRITE:
cgc.data_direction = CGC_DATA_WRITE;
break;
case DATA_NONE:
cgc.data_direction = CGC_DATA_NONE;
break;
default:
Stop("illegal data_mode: %d", data_mode);
}
return ioctl(dh->fd, CDROM_SEND_PACKET, &cgc);
}
/*
* Access to the drive through the generic SCSI interface
* has been added in dvdisaster 0.72 - it seems to be better
* maintained than the older CDROM_SEND_PACKET interface now.
* Especially parallel SCSI cdroms require this now.
*/
static int send_packet_generic(DeviceHandle *dh, unsigned char *cmd, int cdb_size, unsigned char *buf, int size, Sense *sense, int data_mode)
{ struct sg_io_hdr sg_io;
#ifdef ASSERT_CDB_LENGTH
test_cdb(cmd, cdb_size, data_mode);
#endif
memset(&sg_io, 0, sizeof(sg_io));
sg_io.interface_id = 'S';
switch(data_mode)
{ case DATA_READ:
sg_io.dxfer_direction = SG_DXFER_FROM_DEV;
break;
case DATA_WRITE:
sg_io.dxfer_direction = SG_DXFER_TO_DEV;
break;
case DATA_NONE:
sg_io.dxfer_direction = SG_DXFER_NONE;
break;
default:
Stop("illegal data_mode: %d", data_mode);
}
sg_io.cmd_len = cdb_size;
sg_io.mx_sb_len = sizeof(Sense);
sg_io.dxfer_len = size;
sg_io.dxferp = buf;
sg_io.cmdp = cmd;
sg_io.sbp = (unsigned char*)sense;
sg_io.timeout = 10*60*1000;
sg_io.flags = SG_FLAG_LUN_INHIBIT|SG_FLAG_DIRECT_IO;
if(ioctl(dh->fd,SG_IO,&sg_io))
{ dh->sense.sense_key = 3; /* pseudo error indicating */
dh->sense.asc = 255; /* ioctl() failure */
dh->sense.ascq = 254;
return -1;
}
if(sg_io.status)
return -1;
#if 0
if ((sg_io.info&SG_INFO_OK_MASK) == SG_INFO_OK)
return 0;
#endif
return 0;
}
int SendPacket(DeviceHandle *dh, unsigned char *cmd, int cdb_size, unsigned char *buf, int size, Sense *sense, int data_mode)
{
if(dh->simImage)
return SimulateSendPacket(dh, cmd, cdb_size, buf, size, sense, data_mode);
switch(Closure->useSCSIDriver)
{
case DRIVER_SG:
return send_packet_generic(dh, cmd, cdb_size, buf, size, sense, data_mode);
case DRIVER_CDROM:
return send_packet_cdrom(dh, cmd, cdb_size, buf, size, sense, data_mode);
default:
Stop("no SCSI driver selected");
break;
}
return -1;
}
#endif /* SYS_LINUX */
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