static int sg_io(struct file *file, request_queue_t *q,
struct gendisk *bd_disk, struct sg_io_hdr *hdr)
{
unsigned long start_time, timeout;
int writing = 0, ret = 0;
struct request *rq;
char sense[SCSI_SENSE_BUFFERSIZE];
unsigned char cmd[BLK_MAX_CDB];
struct bio *bio;
if (hdr->interface_id != 'S')
return -EINVAL;
if (hdr->cmd_len > BLK_MAX_CDB)
return -EINVAL;
if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
return -EFAULT;
if (verify_command(file, cmd))
return -EPERM;
if (hdr->dxfer_len > (q->max_hw_sectors << 9))
return -EIO;
if (hdr->dxfer_len)
switch (hdr->dxfer_direction) {
default:
return -EINVAL;
case SG_DXFER_TO_DEV:
writing = 1;
break;
case SG_DXFER_TO_FROM_DEV:
case SG_DXFER_FROM_DEV:
break;
}
rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
if (!rq)
return -ENOMEM;
/*
* fill in request structure
*/
rq->cmd_len = hdr->cmd_len;
memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
memcpy(rq->cmd, cmd, hdr->cmd_len);
memset(sense, 0, sizeof(sense));
rq->sense = sense;
rq->sense_len = 0;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
timeout = msecs_to_jiffies(hdr->timeout);
rq->timeout = (timeout < INT_MAX) ? timeout : INT_MAX;
if (!rq->timeout)
rq->timeout = q->sg_timeout;
if (!rq->timeout)
rq->timeout = BLK_DEFAULT_TIMEOUT;
if (hdr->iovec_count) {
const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
struct sg_iovec *iov;
iov = kmalloc(size, GFP_KERNEL);
if (!iov) {
ret = -ENOMEM;
goto out;
}
if (copy_from_user(iov, hdr->dxferp, size)) {
kfree(iov);
ret = -EFAULT;
goto out;
}
ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count,
hdr->dxfer_len);
kfree(iov);
} else if (hdr->dxfer_len)
ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
if (ret)
goto out;
bio = rq->bio;
rq->retries = 0;
start_time = jiffies;
/* ignore return value. All information is passed back to caller
* (if he doesn't check that is his problem).
* N.B. a non-zero SCSI status is _not_ necessarily an error.
*/
blk_execute_rq(q, bd_disk, rq, 0);
/* write to all output members */
hdr->status = 0xff & rq->errors;
hdr->masked_status = status_byte(rq->errors);
hdr->msg_status = msg_byte(rq->errors);
hdr->host_status = host_byte(rq->errors);
hdr->driver_status = driver_byte(rq->errors);
hdr->info = 0;
if (hdr->masked_status || hdr->host_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
hdr->resid = rq->data_len;
hdr->duration = ((jiffies - start_time) * 1000) / HZ;
hdr->sb_len_wr = 0;
if (rq->sense_len && hdr->sbp) {
int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
if (!copy_to_user(hdr->sbp, rq->sense, len))
hdr->sb_len_wr = len;
}
if (blk_rq_unmap_user(bio))
ret = -EFAULT;
/* may not have succeeded, but output values written to control
* structure (struct sg_io_hdr). */
out:
blk_put_request(rq);
return ret;
}
void scsi_print_hostbyte(int scsiresult)
{
printk("Hostbyte=0x%02x ", host_byte(scsiresult));
}
void scsi_show_result(int result)
{
printk("Result: hostbyte=0x%02x driverbyte=0x%02x\n",
host_byte(result), driver_byte(result));
}
/* Convert the result to success code */
static int osst_chk_result(struct osst_tape * STp, struct osst_request * SRpnt)
{
char *name = tape_name(STp);
int result = SRpnt->result;
u8 * sense = SRpnt->sense, scode;
#if DEBUG
const char *stp;
#endif
struct st_cmdstatus *cmdstatp;
if (!result)
return 0;
cmdstatp = &STp->buffer->cmdstat;
osst_analyze_sense(SRpnt, cmdstatp);
if (cmdstatp->have_sense)
scode = STp->buffer->cmdstat.sense_hdr.sense_key;
else
scode = 0;
#if DEBUG
if (debugging) {
printk(OSST_DEB_MSG "%s:D: Error: %x, cmd: %x %x %x %x %x %x\n",
name, result,
SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
if (scode) printk(OSST_DEB_MSG "%s:D: Sense: %02x, ASC: %02x, ASCQ: %02x\n",
name, scode, sense[12], sense[13]);
if (cmdstatp->have_sense)
__scsi_print_sense("osst ", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
}
else
#endif
if (cmdstatp->have_sense && (
scode != NO_SENSE &&
scode != RECOVERED_ERROR &&
/* scode != UNIT_ATTENTION && */
scode != BLANK_CHECK &&
scode != VOLUME_OVERFLOW &&
SRpnt->cmd[0] != MODE_SENSE &&
SRpnt->cmd[0] != TEST_UNIT_READY)) { /* Abnormal conditions for tape */
if (cmdstatp->have_sense) {
printk(KERN_WARNING "%s:W: Command with sense data:\n", name);
__scsi_print_sense("osst ", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
}
else {
static int notyetprinted = 1;
printk(KERN_WARNING
"%s:W: Warning %x (driver bt 0x%x, host bt 0x%x).\n",
name, result, driver_byte(result),
host_byte(result));
if (notyetprinted) {
notyetprinted = 0;
printk(KERN_INFO
"%s:I: This warning may be caused by your scsi controller,\n", name);
printk(KERN_INFO
"%s:I: it has been reported with some Buslogic cards.\n", name);
}
}
}
STp->pos_unknown |= STp->device->was_reset;
if (cmdstatp->have_sense && scode == RECOVERED_ERROR) {
STp->recover_count++;
STp->recover_erreg++;
#if DEBUG
if (debugging) {
if (SRpnt->cmd[0] == READ_6)
stp = "read";
else if (SRpnt->cmd[0] == WRITE_6)
stp = "write";
else
stp = "ioctl";
printk(OSST_DEB_MSG "%s:D: Recovered %s error (%d).\n", name, stp,
STp->recover_count);
}
#endif
if ((sense[2] & 0xe0) == 0)
return 0;
}
return (-EIO);
}
