C++ scsi_get_resid函数代码示例

static void sas_scsi_task_done(struct sas_task *task)
{
	struct task_status_struct *ts = &task->task_status;
	struct scsi_cmnd *sc = task->uldd_task;
	int hs = 0, stat = 0;

	if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
		/* Aborted tasks will be completed by the error handler */
		SAS_DPRINTK("task done but aborted\n");
		return;
	}

	if (unlikely(!sc)) {
		SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
		list_del_init(&task->list);
		sas_free_task(task);
		return;
	}

	if (ts->resp == SAS_TASK_UNDELIVERED) {
		/* transport error */
		hs = DID_NO_CONNECT;
	} else { /* ts->resp == SAS_TASK_COMPLETE */
		/* task delivered, what happened afterwards? */
		switch (ts->stat) {
		case SAS_DEV_NO_RESPONSE:
		case SAS_INTERRUPTED:
		case SAS_PHY_DOWN:
		case SAS_NAK_R_ERR:
		case SAS_OPEN_TO:
			hs = DID_NO_CONNECT;
			break;
		case SAS_DATA_UNDERRUN:
			scsi_set_resid(sc, ts->residual);
			if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
				hs = DID_ERROR;
			break;
		case SAS_DATA_OVERRUN:
			hs = DID_ERROR;
			break;
		case SAS_QUEUE_FULL:
			hs = DID_SOFT_ERROR; /* retry */
			break;
		case SAS_DEVICE_UNKNOWN:
			hs = DID_BAD_TARGET;
			break;
		case SAS_SG_ERR:
			hs = DID_PARITY;
			break;
		case SAS_OPEN_REJECT:
			if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
				hs = DID_SOFT_ERROR; /* retry */
			else
				hs = DID_ERROR;
			break;
		case SAS_PROTO_RESPONSE:
			SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
				    "task; please report this\n",
				    task->dev->port->ha->sas_ha_name);
			break;
		case SAS_ABORTED_TASK:
			hs = DID_ABORT;
			break;
		case SAM_STAT_CHECK_CONDITION:
			memcpy(sc->sense_buffer, ts->buf,
			       min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
			stat = SAM_STAT_CHECK_CONDITION;
			break;
		default:
			stat = ts->stat;
			break;
		}
	}
	ASSIGN_SAS_TASK(sc, NULL);
	sc->result = (hs << 16) | stat;
	list_del_init(&task->list);
	sas_free_task(task);
	sc->scsi_done(sc);
}

/* There are so many devices that report the capacity incorrectly,
 * this routine was written to counteract some of the resulting
 * problems.
 */
static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb)
{
	struct gendisk *disk;
	struct scsi_disk *sdkp;
	u32 sector;

	/* To Report "Medium Error: Record Not Found */
	static unsigned char record_not_found[18] = {
		[0]	= 0x70,			/* current error */
		[2]	= MEDIUM_ERROR,		/* = 0x03 */
		[7]	= 0x0a,			/* additional length */
		[12]	= 0x14			/* Record Not Found */
	};

	/* If last-sector problems can't occur, whether because the
	 * capacity was already decremented or because the device is
	 * known to report the correct capacity, then we don't need
	 * to do anything.
	 */
	if (!us->use_last_sector_hacks)
		return;

	/* Was this command a READ(10) or a WRITE(10)? */
	if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10)
		goto done;

	/* Did this command access the last sector? */
	sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) |
			(srb->cmnd[4] << 8) | (srb->cmnd[5]);
	disk = srb->request->rq_disk;
	if (!disk)
		goto done;
	sdkp = scsi_disk(disk);
	if (!sdkp)
		goto done;
	if (sector + 1 != sdkp->capacity)
		goto done;

	if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) {

		/* The command succeeded.  We know this device doesn't
		 * have the last-sector bug, so stop checking it.
		 */
		us->use_last_sector_hacks = 0;

	} else {
		/* The command failed.  Allow up to 3 retries in case this
		 * is some normal sort of failure.  After that, assume the
		 * capacity is wrong and we're trying to access the sector
		 * beyond the end.  Replace the result code and sense data
		 * with values that will cause the SCSI core to fail the
		 * command immediately, instead of going into an infinite
		 * (or even just a very long) retry loop.
		 */
		if (++us->last_sector_retries < 3)
			return;
		srb->result = SAM_STAT_CHECK_CONDITION;
		memcpy(srb->sense_buffer, record_not_found,
				sizeof(record_not_found));
	}

 done:
	/* Don't reset the retry counter for TEST UNIT READY commands,
	 * because they get issued after device resets which might be
	 * caused by a failed last-sector access.
	 */
	if (srb->cmnd[0] != TEST_UNIT_READY)
		us->last_sector_retries = 0;
}

/* Invoke the transport and basic error-handling/recovery methods
 *
 * This is used by the protocol layers to actually send the message to
 * the device and receive the response.
 */
void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int need_auto_sense;
	int result;

	/* send the command to the transport layer */
	scsi_set_resid(srb, 0);
	result = us->transport(srb, us);

	/* if the command gets aborted by the higher layers, we need to
	 * short-circuit all other processing
	 */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
		US_DEBUGP("-- command was aborted\n");
		srb->result = DID_ABORT << 16;
		goto Handle_Errors;
	}

	/* if there is a transport error, reset and don't auto-sense */
	if (result == USB_STOR_TRANSPORT_ERROR) {
		US_DEBUGP("-- transport indicates error, resetting\n");
		srb->result = DID_ERROR << 16;
		goto Handle_Errors;
	}

	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE) {
		srb->result = SAM_STAT_CHECK_CONDITION;
		last_sector_hacks(us, srb);
		return;
	}

	srb->result = SAM_STAT_GOOD;

	/* Determine if we need to auto-sense
	 *
	 * I normally don't use a flag like this, but it's almost impossible
	 * to understand what's going on here if I don't.
	 */
	need_auto_sense = 0;

	/*
	 * If we're running the CB transport, which is incapable
	 * of determining status on its own, we will auto-sense
	 * unless the operation involved a data-in transfer.  Devices
	 * can signal most data-in errors by stalling the bulk-in pipe.
	 */
	if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) &&
			srb->sc_data_direction != DMA_FROM_DEVICE) {
		US_DEBUGP("-- CB transport device requiring auto-sense\n");
		need_auto_sense = 1;
	}

	/*
	 * If we have a failure, we're going to do a REQUEST_SENSE 
	 * automatically.  Note that we differentiate between a command
	 * "failure" and an "error" in the transport mechanism.
	 */
	if (result == USB_STOR_TRANSPORT_FAILED) {
		US_DEBUGP("-- transport indicates command failure\n");
		need_auto_sense = 1;
	}

	/*
	 * Determine if this device is SAT by seeing if the
	 * command executed successfully.  Otherwise we'll have
	 * to wait for at least one CHECK_CONDITION to determine
	 * SANE_SENSE support
	 */
	if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) &&
	    result == USB_STOR_TRANSPORT_GOOD &&
	    !(us->fflags & US_FL_SANE_SENSE) &&
	    !(us->fflags & US_FL_BAD_SENSE) &&
	    !(srb->cmnd[2] & 0x20))) {
		US_DEBUGP("-- SAT supported, increasing auto-sense\n");
		us->fflags |= US_FL_SANE_SENSE;
	}

	/*
	 * A short transfer on a command where we don't expect it
	 * is unusual, but it doesn't mean we need to auto-sense.
	 */
	if ((scsi_get_resid(srb) > 0) &&
	    !((srb->cmnd[0] == REQUEST_SENSE) ||
	      (srb->cmnd[0] == INQUIRY) ||
	      (srb->cmnd[0] == MODE_SENSE) ||
	      (srb->cmnd[0] == LOG_SENSE) ||
	      (srb->cmnd[0] == MODE_SENSE_10))) {
		US_DEBUGP("-- unexpectedly short transfer\n");
	}

	/* Now, if we need to do the auto-sense, let's do it */
	if (need_auto_sense) {
		int temp_result;
		struct scsi_eh_save ses;
//.........这里部分代码省略.........

static inline void nsp_inc_resid(struct scsi_cmnd *SCpnt, int residInc)
{
	scsi_set_resid(SCpnt, scsi_get_resid(SCpnt) + residInc);
}

int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
	struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
	unsigned int transfer_length = scsi_bufflen(srb);
	unsigned int residue;
	int result;
	int fake_sense = 0;
	unsigned int cswlen;
	unsigned int cbwlen = US_BULK_CB_WRAP_LEN;

	/* Take care of BULK32 devices; set extra byte to 0 */
	if (unlikely(us->fflags & US_FL_BULK32)) {
		cbwlen = 32;
		us->iobuf[31] = 0;
	}

	/* set up the command wrapper */
	bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
	bcb->DataTransferLength = cpu_to_le32(transfer_length);
	bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ?
		US_BULK_FLAG_IN : 0;
	bcb->Tag = ++us->tag;
	bcb->Lun = srb->device->lun;
	if (us->fflags & US_FL_SCM_MULT_TARG)
		bcb->Lun |= srb->device->id << 4;
	bcb->Length = srb->cmd_len;

	/* copy the command payload */
	memset(bcb->CDB, 0, sizeof(bcb->CDB));
	memcpy(bcb->CDB, srb->cmnd, bcb->Length);

	/* send it to out endpoint */
	US_DEBUGP("Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n",
			le32_to_cpu(bcb->Signature), bcb->Tag,
			le32_to_cpu(bcb->DataTransferLength), bcb->Flags,
			(bcb->Lun >> 4), (bcb->Lun & 0x0F), 
			bcb->Length);
	result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
				bcb, cbwlen, NULL);
	US_DEBUGP("Bulk command transfer result=%d\n", result);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	/* DATA STAGE */
	/* send/receive data payload, if there is any */

	/* Some USB-IDE converter chips need a 100us delay between the
	 * command phase and the data phase.  Some devices need a little
	 * more than that, probably because of clock rate inaccuracies. */
	if (unlikely(us->fflags & US_FL_GO_SLOW))
		udelay(125);

	if (transfer_length) {
		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
				us->recv_bulk_pipe : us->send_bulk_pipe;
		result = usb_stor_bulk_srb(us, pipe, srb);
		US_DEBUGP("Bulk data transfer result 0x%x\n", result);
		if (result == USB_STOR_XFER_ERROR)
			return USB_STOR_TRANSPORT_ERROR;

		/* If the device tried to send back more data than the
		 * amount requested, the spec requires us to transfer
		 * the CSW anyway.  Since there's no point retrying the
		 * the command, we'll return fake sense data indicating
		 * Illegal Request, Invalid Field in CDB.
		 */
		if (result == USB_STOR_XFER_LONG)
			fake_sense = 1;

		/*
		 * Sometimes a device will mistakenly skip the data phase
		 * and go directly to the status phase without sending a
		 * zero-length packet.  If we get a 13-byte response here,
		 * check whether it really is a CSW.
		 */
		if (result == USB_STOR_XFER_SHORT &&
				srb->sc_data_direction == DMA_FROM_DEVICE &&
				transfer_length - scsi_get_resid(srb) ==
					US_BULK_CS_WRAP_LEN) {
			struct scatterlist *sg = NULL;
			unsigned int offset = 0;

			if (usb_stor_access_xfer_buf((unsigned char *) bcs,
					US_BULK_CS_WRAP_LEN, srb, &sg,
					&offset, FROM_XFER_BUF) ==
						US_BULK_CS_WRAP_LEN &&
					bcs->Signature ==
						cpu_to_le32(US_BULK_CS_SIGN)) {
				US_DEBUGP("Device skipped data phase\n");
				scsi_set_resid(srb, transfer_length);
				goto skipped_data_phase;
			}
		}
	}

	/* See flow chart on pg 15 of the Bulk Only Transport spec for
	 * an explanation of how this code works.
	 */

//.........这里部分代码省略.........

//.........这里部分代码省略.........
			pipe = us->send_bulk_pipe;

		result = usb_stor_bulk_srb(us, pipe, srb);
		/* pr_info("Bulk data transfer result 0x%x\n", result); */
		if (result == USB_STOR_XFER_ERROR)
			return USB_STOR_TRANSPORT_ERROR;

		if (result == USB_STOR_XFER_LONG)
			fake_sense = 1;
	}

	/* get CSW for device status */
	/* pr_info("Attempting to get CSW...\n"); */
	result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
						US_BULK_CS_WRAP_LEN, &cswlen);

	if (result == USB_STOR_XFER_SHORT && cswlen == 0) {
		/* pr_info("Received 0-length CSW; retrying...\n"); */
		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
						US_BULK_CS_WRAP_LEN, &cswlen);
	}

	/* did the attempt to read the CSW fail? */
	if (result == USB_STOR_XFER_STALLED) {
		/* get the status again */
		/* pr_info("Attempting to get CSW (2nd try)...\n"); */
		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
						US_BULK_CS_WRAP_LEN, NULL);
	}

	/* if we still have a failure at this point, we're in trouble */
	/* pr_info("Bulk status result = %d\n", result); */
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	/* check bulk status */
	residue = le32_to_cpu(bcs->Residue);
	/* pr_info("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n",
				le32_to_cpu(bcs->Signature),
				bcs->Tag, residue, bcs->Status); */
	if (!(bcs->Tag == us->tag ||
		(us->fflags & US_FL_BULK_IGNORE_TAG)) ||
		bcs->Status > US_BULK_STAT_PHASE) {
		/* pr_info("Bulk logical error\n"); */
		return USB_STOR_TRANSPORT_ERROR;
	}

	if (!us->bcs_signature) {
		us->bcs_signature = bcs->Signature;
		/* if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) */
		/* pr_info("Learnt BCS signature 0x%08X\n",
				le32_to_cpu(us->bcs_signature)); */
	} else if (bcs->Signature != us->bcs_signature) {
		/* pr_info("Signature mismatch: got %08X, expecting %08X\n",
			  le32_to_cpu(bcs->Signature),
			  le32_to_cpu(us->bcs_signature)); */
		return USB_STOR_TRANSPORT_ERROR;
	}

	/* try to compute the actual residue, based on how much data
	 * was really transferred and what the device tells us */
	if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) {

		/* Heuristically detect devices that generate bogus residues
		 * by seeing what happens with INQUIRY and READ CAPACITY
		 * commands.
		 */
		if (bcs->Status == US_BULK_STAT_OK &&
				scsi_get_resid(srb) == 0 &&
					((srb->cmnd[0] == INQUIRY &&
						transfer_length == 36) ||
					(srb->cmnd[0] == READ_CAPACITY &&
						transfer_length == 8))) {
			us->fflags |= US_FL_IGNORE_RESIDUE;

		} else {
			residue = min(residue, transfer_length);
			scsi_set_resid(srb, max(scsi_get_resid(srb),
							(int) residue));
		}
	}

	/* based on the status code, we report good or bad */
	switch (bcs->Status) {
	case US_BULK_STAT_OK:
		if (fake_sense) {
			memcpy(srb->sense_buffer, usb_stor_sense_invalidCDB,
					sizeof(usb_stor_sense_invalidCDB));
			return USB_STOR_TRANSPORT_NO_SENSE;
		}
		return USB_STOR_TRANSPORT_GOOD;

	case US_BULK_STAT_FAIL:
		return USB_STOR_TRANSPORT_FAILED;

	case US_BULK_STAT_PHASE:
		return USB_STOR_TRANSPORT_ERROR;
	}
	return USB_STOR_TRANSPORT_ERROR;
}

/*
 * ENE_stor_invoke_transport()
 */
void ENE_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int result = 0;

	/* pr_info("transport --- ENE_stor_invoke_transport\n"); */
	usb_stor_print_cmd(srb);
	/* send the command to the transport layer */
	scsi_set_resid(srb, 0);
	if (!(us->MS_Status.Ready || us->SM_Status.Ready))
		result = ENE_InitMedia(us);

	if (us->Power_IsResum == true) {
		result = ENE_InitMedia(us);
		us->Power_IsResum = false;
	}

	if (us->MS_Status.Ready)
		result = MS_SCSIIrp(us, srb);
	if (us->SM_Status.Ready)
		result = SM_SCSIIrp(us, srb);

	/* if the command gets aborted by the higher layers,
		we need to short-circuit all other processing */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
		/* pr_info("-- command was aborted\n"); */
		srb->result = DID_ABORT << 16;
		goto Handle_Errors;
	}

	/* if there is a transport error, reset and don't auto-sense */
	if (result == USB_STOR_TRANSPORT_ERROR) {
		/* pr_info("-- transport indicates error, resetting\n"); */
		srb->result = DID_ERROR << 16;
		goto Handle_Errors;
	}

	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE) {
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;
	}

	srb->result = SAM_STAT_GOOD;
	if (result == USB_STOR_TRANSPORT_FAILED) {
		/* pr_info("-- transport indicates command failure\n"); */
		/* need_auto_sense = 1; */
		BuildSenseBuffer(srb, us->SrbStatus);
		srb->result = SAM_STAT_CHECK_CONDITION;
	}

	/* Did we transfer less than the minimum amount required? */
	if (srb->result == SAM_STAT_GOOD && scsi_bufflen(srb) -
					scsi_get_resid(srb) < srb->underflow)
		srb->result = (DID_ERROR << 16);
		/* v02 | (SUGGEST_RETRY << 24); */

	return;

Handle_Errors:
	scsi_lock(us_to_host(us));
	set_bit(US_FLIDX_RESETTING, &us->dflags);
	clear_bit(US_FLIDX_ABORTING, &us->dflags);
	scsi_unlock(us_to_host(us));

	mutex_unlock(&us->dev_mutex);
	result = usb_stor_port_reset(us);
	mutex_lock(&us->dev_mutex);

	if (result < 0) {
		scsi_lock(us_to_host(us));
		usb_stor_report_device_reset(us);
		scsi_unlock(us_to_host(us));
		us->transport_reset(us);
	}
	clear_bit(US_FLIDX_RESETTING, &us->dflags);
}

//.........这里部分代码省略.........
		goto Handle_Errors;
	}

	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE) {
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;
	}

	srb->result = SAM_STAT_GOOD;

	/* Determine if we need to auto-sense */
	need_auto_sense = 0;

	if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) &&
				srb->sc_data_direction != DMA_FROM_DEVICE) {
		/* pr_info("-- CB transport device requiring auto-sense\n"); */
		need_auto_sense = 1;
	}

	if (result == USB_STOR_TRANSPORT_FAILED) {
		/* pr_info("-- transport indicates command failure\n"); */
		need_auto_sense = 1;
	}

	/* Now, if we need to do the auto-sense, let's do it */
	if (need_auto_sense) {
		int temp_result;
		struct scsi_eh_save ses;

		pr_info("Issuing auto-REQUEST_SENSE\n");

		scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);

		/* we must do the protocol translation here */
		if (us->subclass == USB_SC_RBC ||
			us->subclass == USB_SC_SCSI ||
			us->subclass == USB_SC_CYP_ATACB) {
			srb->cmd_len = 6;
		} else {
			srb->cmd_len = 12;
		}
		/* issue the auto-sense command */
		scsi_set_resid(srb, 0);
		temp_result = us->transport(us->srb, us);

		/* let's clean up right away */
		scsi_eh_restore_cmnd(srb, &ses);

		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
			/* pr_info("-- auto-sense aborted\n"); */
			srb->result = DID_ABORT << 16;
			goto Handle_Errors;
		}
		if (temp_result != USB_STOR_TRANSPORT_GOOD) {
			/* pr_info("-- auto-sense failure\n"); */
			srb->result = DID_ERROR << 16;
			if (!(us->fflags & US_FL_SCM_MULT_TARG))
				goto Handle_Errors;
			return;
		}

		/* set the result so the higher layers expect this data */
		srb->result = SAM_STAT_CHECK_CONDITION;

		if (result == USB_STOR_TRANSPORT_GOOD &&
			(srb->sense_buffer[2] & 0xaf) == 0 &&
			srb->sense_buffer[12] == 0 &&
			srb->sense_buffer[13] == 0) {
			srb->result = SAM_STAT_GOOD;
			srb->sense_buffer[0] = 0x0;
		}
	}

	/* Did we transfer less than the minimum amount required? */
	if (srb->result == SAM_STAT_GOOD && scsi_bufflen(srb) -
				scsi_get_resid(srb) < srb->underflow)
		srb->result = (DID_ERROR << 16);
		/* v02 | (SUGGEST_RETRY << 24); */

	return;

Handle_Errors:
	scsi_lock(us_to_host(us));
	set_bit(US_FLIDX_RESETTING, &us->dflags);
	clear_bit(US_FLIDX_ABORTING, &us->dflags);
	scsi_unlock(us_to_host(us));

	mutex_unlock(&us->dev_mutex);
	result = usb_stor_port_reset(us);
	mutex_lock(&us->dev_mutex);

	if (result < 0) {
		scsi_lock(us_to_host(us));
		usb_stor_report_device_reset(us);
		scsi_unlock(us_to_host(us));
		us->transport_reset(us);
	}
	clear_bit(US_FLIDX_RESETTING, &us->dflags);
}

/* Invoke the transport and basic error-handling/recovery methods
 *
 * This is used by the protocol layers to actually send the message to
 * the device and receive the response.
 */
void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int need_auto_sense;
	int result;

	/* send the command to the transport layer */
	scsi_set_resid(srb, 0);
	result = us->transport(srb, us);

	/* if the command gets aborted by the higher layers, we need to
	 * short-circuit all other processing
	 */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
		US_DEBUGP("-- command was aborted\n");
		srb->result = DID_ABORT << 16;
		goto Handle_Errors;
	}

	/* if there is a transport error, reset and don't auto-sense */
	if (result == USB_STOR_TRANSPORT_ERROR) {
		US_DEBUGP("-- transport indicates error, resetting\n");
		srb->result = DID_ERROR << 16;
		goto Handle_Errors;
	}

	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE) {
		srb->result = SAM_STAT_CHECK_CONDITION;
		last_sector_hacks(us, srb);
		return;
	}

	srb->result = SAM_STAT_GOOD;

	/* Determine if we need to auto-sense
	 *
	 * I normally don't use a flag like this, but it's almost impossible
	 * to understand what's going on here if I don't.
	 */
	need_auto_sense = 0;

	/*
	 * If we're running the CB transport, which is incapable
	 * of determining status on its own, we will auto-sense
	 * unless the operation involved a data-in transfer.  Devices
	 * can signal most data-in errors by stalling the bulk-in pipe.
	 */
	if ((us->protocol == US_PR_CB || us->protocol == US_PR_DPCM_USB) &&
			srb->sc_data_direction != DMA_FROM_DEVICE) {
		US_DEBUGP("-- CB transport device requiring auto-sense\n");
		need_auto_sense = 1;
	}

	/*
	 * If we have a failure, we're going to do a REQUEST_SENSE 
	 * automatically.  Note that we differentiate between a command
	 * "failure" and an "error" in the transport mechanism.
	 */
	if (result == USB_STOR_TRANSPORT_FAILED) {
		US_DEBUGP("-- transport indicates command failure\n");
		need_auto_sense = 1;
	}

	/*
	 * A short transfer on a command where we don't expect it
	 * is unusual, but it doesn't mean we need to auto-sense.
	 */
	if ((scsi_get_resid(srb) > 0) &&
	    !((srb->cmnd[0] == REQUEST_SENSE) ||
	      (srb->cmnd[0] == INQUIRY) ||
	      (srb->cmnd[0] == MODE_SENSE) ||
	      (srb->cmnd[0] == LOG_SENSE) ||
	      (srb->cmnd[0] == MODE_SENSE_10))) {
		US_DEBUGP("-- unexpectedly short transfer\n");
	}

	/* Now, if we need to do the auto-sense, let's do it */
	if (need_auto_sense) {
		int temp_result;
		struct scsi_eh_save ses;

		US_DEBUGP("Issuing auto-REQUEST_SENSE\n");

		scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);

		/* FIXME: we must do the protocol translation here */
		if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI ||
				us->subclass == US_SC_CYP_ATACB)
			srb->cmd_len = 6;
		else
			srb->cmd_len = 12;

		/* issue the auto-sense command */
		scsi_set_resid(srb, 0);
		temp_result = us->transport(us->srb, us);
//.........这里部分代码省略.........