/*
* Foward space num records
*
* Returns: false on failure
* true on success
*/
bool generic_tape_device::fsr(int num)
{
struct mtop mt_com;
int status;
if (!is_open()) {
dev_errno = EBADF;
Mmsg0(errmsg, _("Bad call to fsr. Device not open\n"));
Emsg0(M_FATAL, 0, errmsg);
return false;
}
if (!has_cap(CAP_FSR)) {
Mmsg1(errmsg, _("ioctl MTFSR not permitted on %s.\n"), prt_name);
return false;
}
Dmsg1(100, "fsr %d\n", num);
mt_com.mt_op = MTFSR;
mt_com.mt_count = num;
status = d_ioctl(m_fd, MTIOCTOP, (char *)&mt_com);
if (status == 0) {
clear_eof();
block_num += num;
} else {
berrno be;
struct mtget mt_stat;
clrerror(mt_com.mt_op);
Dmsg1(100, "FSF fail: ERR=%s\n", be.bstrerror());
if (dev_get_os_pos(this, &mt_stat)) {
Dmsg4(100, "Adjust from %d:%d to %d:%d\n", file,
block_num, mt_stat.mt_fileno, mt_stat.mt_blkno);
file = mt_stat.mt_fileno;
block_num = mt_stat.mt_blkno;
} else {
if (at_eof()) {
set_eot();
} else {
set_ateof();
}
}
Mmsg3(errmsg, _("ioctl MTFSR %d error on %s. ERR=%s.\n"), num, prt_name, be.bstrerror());
}
return status == 0;
}
/*
* Position device to end of medium (end of data)
*
* Returns: true on succes
* false on error
*/
bool DEVICE::eod(DCR *dcr)
{
boffset_t pos;
if (m_fd < 0) {
dev_errno = EBADF;
Mmsg1(errmsg, _("Bad call to eod. Device %s not open\n"), print_name());
return false;
}
if (is_vtl()) {
return true;
}
Dmsg0(100, "Enter eod\n");
if (at_eot()) {
return true;
}
clear_eof(); /* remove EOF flag */
block_num = file = 0;
file_size = 0;
file_addr = 0;
pos = lseek(dcr, (boffset_t)0, SEEK_END);
Dmsg1(200, "====== Seek to %lld\n", pos);
if (pos >= 0) {
update_pos(dcr);
set_eot();
return true;
}
dev_errno = errno;
berrno be;
Mmsg2(errmsg, _("lseek error on %s. ERR=%s.\n"), print_name(), be.bstrerror());
Dmsg0(100, errmsg);
return false;
}
/*
* Foward space a file
*
* Returns: true on success
* false on failure
*/
bool generic_tape_device::fsf(int num)
{
int32_t os_file = 0;
struct mtop mt_com;
int status = 0;
if (!is_open()) {
dev_errno = EBADF;
Mmsg0(errmsg, _("Bad call to fsf. Device not open\n"));
Emsg0(M_FATAL, 0, errmsg);
return false;
}
if (at_eot()) {
dev_errno = 0;
Mmsg1(errmsg, _("Device %s at End of Tape.\n"), prt_name);
return false;
}
if (at_eof()) {
Dmsg0(200, "ST_EOF set on entry to FSF\n");
}
Dmsg0(100, "fsf\n");
block_num = 0;
/*
* If Fast forward space file is set, then we
* use MTFSF to forward space and MTIOCGET
* to get the file position. We assume that
* the SCSI driver will ensure that we do not
* forward space past the end of the medium.
*/
if (has_cap(CAP_FSF) && has_cap(CAP_MTIOCGET) && has_cap(CAP_FASTFSF)) {
int my_errno = 0;
mt_com.mt_op = MTFSF;
mt_com.mt_count = num;
status = d_ioctl(m_fd, MTIOCTOP, (char *)&mt_com);
if (status < 0) {
my_errno = errno; /* save errno */
} else if ((os_file=get_os_tape_file()) < 0) {
my_errno = errno; /* save errno */
}
if (my_errno != 0) {
berrno be;
set_eot();
Dmsg0(200, "Set ST_EOT\n");
clrerror(mt_com.mt_op);
Mmsg2(errmsg, _("ioctl MTFSF error on %s. ERR=%s.\n"), prt_name, be.bstrerror(my_errno));
Dmsg1(200, "%s", errmsg);
return false;
}
Dmsg1(200, "fsf file=%d\n", os_file);
set_ateof();
file = os_file;
return true;
/*
* Here if CAP_FSF is set, and virtually all drives
* these days support it, we read a record, then forward
* space one file. Using this procedure, which is slow,
* is the only way we can be sure that we don't read
* two consecutive EOF marks, which means End of Data.
*/
} else if (has_cap(CAP_FSF)) {
POOLMEM *rbuf;
int rbuf_len;
Dmsg0(200, "FSF has cap_fsf\n");
if (max_block_size == 0) {
rbuf_len = DEFAULT_BLOCK_SIZE;
} else {
rbuf_len = max_block_size;
}
rbuf = get_memory(rbuf_len);
mt_com.mt_op = MTFSF;
mt_com.mt_count = 1;
while (num-- && !at_eot()) {
Dmsg0(100, "Doing read before fsf\n");
if ((status = this->read((char *)rbuf, rbuf_len)) < 0) {
if (errno == ENOMEM) { /* tape record exceeds buf len */
status = rbuf_len; /* This is OK */
/*
* On IBM drives, they return ENOSPC at EOM instead of EOF status
*/
} else if (at_eof() && errno == ENOSPC) {
status = 0;
} else if (has_cap(CAP_IOERRATEOM) && at_eof() && errno == EIO) {
if (has_cap(CAP_IBMLINTAPE)) {
Dmsg0(100, "Got EIO on read, checking lin_tape sense data\n");
if (check_scsi_at_eod(m_fd)) {
Dmsg0(100, "Sense data confirms it's EOD\n");
status = 0;
} else {
Dmsg0(100, "Not at EOD, might be a real error. Check sense trace from lin_taped logs.\n");
set_eot();
clrerror(-1);
Mmsg1(errmsg, _("read error on %s. ERR=Input/Output error.\n"), prt_name);
break;
}
} else {
Dmsg0(100, "Got EIO on read, assuming that's due to EOD\n");
status = 0;
}
} else {
berrno be;
set_eot();
clrerror(-1);
Dmsg2(100, "Set ST_EOT read errno=%d. ERR=%s\n", dev_errno, be.bstrerror());
Mmsg2(errmsg, _("read error on %s. ERR=%s.\n"), prt_name, be.bstrerror());
Dmsg1(100, "%s", errmsg);
break;
}
}
if (status == 0) { /* EOF */
Dmsg1(100, "End of File mark from read. File=%d\n", file+1);
/*
* Two reads of zero means end of tape
*/
if (at_eof()) {
set_eot();
Dmsg0(100, "Set ST_EOT\n");
break;
} else {
set_ateof();
continue;
}
} else { /* Got data */
clear_eot();
clear_eof();
}
Dmsg0(100, "Doing MTFSF\n");
status = d_ioctl(m_fd, MTIOCTOP, (char *)&mt_com);
if (status < 0) { /* error => EOT */
berrno be;
set_eot();
Dmsg0(100, "Set ST_EOT\n");
clrerror(mt_com.mt_op);
Mmsg2(errmsg, _("ioctl MTFSF error on %s. ERR=%s.\n"), prt_name, be.bstrerror());
Dmsg0(100, "Got < 0 for MTFSF\n");
Dmsg1(100, "%s", errmsg);
} else {
set_ateof();
}
}
free_memory(rbuf);
/*
* No FSF, so use FSR to simulate it
*/
} else {
Dmsg0(200, "Doing FSR for FSF\n");
while (num-- && !at_eot()) {
fsr(INT32_MAX); /* returns -1 on EOF or EOT */
}
if (at_eot()) {
dev_errno = 0;
Mmsg1(errmsg, _("Device %s at End of Tape.\n"), prt_name);
status = -1;
} else {
status = 0;
}
}
Dmsg1(200, "Return %d from FSF\n", status);
if (at_eof()) {
Dmsg0(200, "ST_EOF set on exit FSF\n");
}
if (at_eot()) {
Dmsg0(200, "ST_EOT set on exit FSF\n");
}
Dmsg1(200, "Return from FSF file=%d\n", file);
return status == 0;
}
