Commit 279afdfe authored by Ewan D. Milne's avatar Ewan D. Milne Committed by James Bottomley
Browse files

[SCSI] Generate uevents on certain unit attention codes 



Generate a uevent when the following Unit Attention ASC/ASCQ
codes are received:

    2A/01  MODE PARAMETERS CHANGED
    2A/09  CAPACITY DATA HAS CHANGED
    38/07  THIN PROVISIONING SOFT THRESHOLD REACHED
    3F/03  INQUIRY DATA HAS CHANGED
    3F/0E  REPORTED LUNS DATA HAS CHANGED

Log kernel messages when the following Unit Attention ASC/ASCQ
codes are received that are not as specific as those above:

    2A/xx  PARAMETERS CHANGED
    3F/xx  TARGET OPERATING CONDITIONS HAVE CHANGED

Added logic to set expecting_lun_change for other LUNs on the target
after REPORTED LUNS DATA HAS CHANGED is received, so that duplicate
uevents are not generated, and clear expecting_lun_change when a
REPORT LUNS command completes, in accordance with the SPC-3
specification regarding reporting of the 3F 0E ASC/ASCQ UA.

[jejb: remove SPC3 test in scsi_report_lun_change and some docbook fixes and
       unused variable fix, both reported by Fengguang Wu]
Signed-off-by: default avatarEwan D. Milne <emilne@redhat.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent f8813d26

drivers/scsi/scsi_error.c

+80 −20
Original line number Diff line number Diff line
@@ -223,6 +223,74 @@ static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, 
}

#endif



 /**

 * scsi_report_lun_change - Set flag on all *other* devices on the same target

 *                          to indicate that a UNIT ATTENTION is expected.

 * @sdev:	Device reporting the UNIT ATTENTION

 */

static void scsi_report_lun_change(struct scsi_device *sdev)

{

	sdev->sdev_target->expecting_lun_change = 1;

}



/**

 * scsi_report_sense - Examine scsi sense information and log messages for

 *		       certain conditions, also issue uevents for some of them.

 * @sdev:	Device reporting the sense code

 * @sshdr:	sshdr to be examined

 */

static void scsi_report_sense(struct scsi_device *sdev,

			      struct scsi_sense_hdr *sshdr)

{

	enum scsi_device_event evt_type = SDEV_EVT_MAXBITS;	/* i.e. none */



	if (sshdr->sense_key == UNIT_ATTENTION) {

		if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) {

			evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED;

			sdev_printk(KERN_WARNING, sdev,

				    "Inquiry data has changed");

		} else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) {

			evt_type = SDEV_EVT_LUN_CHANGE_REPORTED;

			scsi_report_lun_change(sdev);

			sdev_printk(KERN_WARNING, sdev,

				    "Warning! Received an indication that the "

				    "LUN assignments on this target have "

				    "changed. The Linux SCSI layer does not "

				    "automatically remap LUN assignments.\n");

		} else if (sshdr->asc == 0x3f)

			sdev_printk(KERN_WARNING, sdev,

				    "Warning! Received an indication that the "

				    "operating parameters on this target have "

				    "changed. The Linux SCSI layer does not "

				    "automatically adjust these parameters.\n");



		if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) {

			evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED;

			sdev_printk(KERN_WARNING, sdev,

				    "Warning! Received an indication that the "

				    "LUN reached a thin provisioning soft "

				    "threshold.\n");

		}



		if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) {

			evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED;

			sdev_printk(KERN_WARNING, sdev,

				    "Mode parameters changed");

		} else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) {

			evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED;

			sdev_printk(KERN_WARNING, sdev,

				    "Capacity data has changed");

		} else if (sshdr->asc == 0x2a)

			sdev_printk(KERN_WARNING, sdev,

				    "Parameters changed");

	}



	if (evt_type != SDEV_EVT_MAXBITS) {

		set_bit(evt_type, sdev->pending_events);

		schedule_work(&sdev->event_work);

	}

}



/**

 * scsi_check_sense - Examine scsi cmd sense

 * @scmd:	Cmd to have sense checked.
@@ -250,6 +318,8 @@ static int scsi_check_sense(struct scsi_cmnd *scmd) 
		 */

		return SUCCESS;



	scsi_report_sense(sdev, &sshdr);



	if (scsi_sense_is_deferred(&sshdr))

		return NEEDS_RETRY;
@@ -314,6 +384,14 @@ static int scsi_check_sense(struct scsi_cmnd *scmd) 
				return NEEDS_RETRY;

			}

		}

		/*

		 * we might also expect a cc/ua if another LUN on the target

		 * reported a UA with an ASC/ASCQ of 3F 0E -

		 * REPORTED LUNS DATA HAS CHANGED.

		 */

		if (scmd->device->sdev_target->expecting_lun_change &&

		    sshdr.asc == 0x3f && sshdr.ascq == 0x0e)

			return NEEDS_RETRY;

		/*

		 * if the device is in the process of becoming ready, we

		 * should retry.
@@ -327,26 +405,6 @@ static int scsi_check_sense(struct scsi_cmnd *scmd) 
		if (scmd->device->allow_restart &&

		    (sshdr.asc == 0x04) && (sshdr.ascq == 0x02))

			return FAILED;



		if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e)

			scmd_printk(KERN_WARNING, scmd,

				    "Warning! Received an indication that the "

				    "LUN assignments on this target have "

				    "changed. The Linux SCSI layer does not "

				    "automatically remap LUN assignments.\n");

		else if (sshdr.asc == 0x3f)

			scmd_printk(KERN_WARNING, scmd,

				    "Warning! Received an indication that the "

				    "operating parameters on this target have "

				    "changed. The Linux SCSI layer does not "

				    "automatically adjust these parameters.\n");



		if (sshdr.asc == 0x38 && sshdr.ascq == 0x07)

			scmd_printk(KERN_WARNING, scmd,

				    "Warning! Received an indication that the "

				    "LUN reached a thin provisioning soft "

				    "threshold.\n");



		/*

		 * Pass the UA upwards for a determination in the completion

		 * functions.
@@ -1574,6 +1632,8 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd) 
		 */

		return ADD_TO_MLQUEUE;

	case GOOD:

		if (scmd->cmnd[0] == REPORT_LUNS)

			scmd->device->sdev_target->expecting_lun_change = 0;

		scsi_handle_queue_ramp_up(scmd->device);

	case COMMAND_TERMINATED:

		return SUCCESS;

drivers/scsi/scsi_lib.c

+25 −1
Original line number Diff line number Diff line
@@ -2253,7 +2253,21 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt) 
	case SDEV_EVT_MEDIA_CHANGE:

		envp[idx++] = "SDEV_MEDIA_CHANGE=1";

		break;



	case SDEV_EVT_INQUIRY_CHANGE_REPORTED:

		envp[idx++] = "SDEV_UA=INQUIRY_DATA_HAS_CHANGED";

		break;

	case SDEV_EVT_CAPACITY_CHANGE_REPORTED:

		envp[idx++] = "SDEV_UA=CAPACITY_DATA_HAS_CHANGED";

		break;

	case SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED:

	       envp[idx++] = "SDEV_UA=THIN_PROVISIONING_SOFT_THRESHOLD_REACHED";

		break;

	case SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED:

		envp[idx++] = "SDEV_UA=MODE_PARAMETERS_CHANGED";

		break;

	case SDEV_EVT_LUN_CHANGE_REPORTED:

		envp[idx++] = "SDEV_UA=REPORTED_LUNS_DATA_HAS_CHANGED";

		break;

	default:

		/* do nothing */

		break;
@@ -2274,10 +2288,15 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt) 
void scsi_evt_thread(struct work_struct *work)

{

	struct scsi_device *sdev;

	enum scsi_device_event evt_type;

	LIST_HEAD(event_list);



	sdev = container_of(work, struct scsi_device, event_work);



	for (evt_type = SDEV_EVT_FIRST; evt_type <= SDEV_EVT_LAST; evt_type++)

		if (test_and_clear_bit(evt_type, sdev->pending_events))

			sdev_evt_send_simple(sdev, evt_type, GFP_KERNEL);



	while (1) {

		struct scsi_event *evt;

		struct list_head *this, *tmp;
@@ -2347,6 +2366,11 @@ struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 
	/* evt_type-specific initialization, if any */

	switch (evt_type) {

	case SDEV_EVT_MEDIA_CHANGE:

	case SDEV_EVT_INQUIRY_CHANGE_REPORTED:

	case SDEV_EVT_CAPACITY_CHANGE_REPORTED:

	case SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED:

	case SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED:

	case SDEV_EVT_LUN_CHANGE_REPORTED:

	default:

		/* do nothing */

		break;

drivers/scsi/scsi_sysfs.c

+10 −0
Original line number Diff line number Diff line
@@ -739,6 +739,11 @@ sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ 
#define REF_EVT(name) &dev_attr_evt_##name.attr



DECLARE_EVT(media_change, MEDIA_CHANGE)

DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)

DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)

DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)

DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)

DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)



/* Default template for device attributes.  May NOT be modified */

static struct attribute *scsi_sdev_attrs[] = {
@@ -759,6 +764,11 @@ static struct attribute *scsi_sdev_attrs[] = { 
	&dev_attr_ioerr_cnt.attr,

	&dev_attr_modalias.attr,

	REF_EVT(media_change),

	REF_EVT(inquiry_change_reported),

	REF_EVT(capacity_change_reported),

	REF_EVT(soft_threshold_reached),

	REF_EVT(mode_parameter_change_reported),

	REF_EVT(lun_change_reported),

	NULL

};

include/scsi/scsi_device.h

+12 −1
Original line number Diff line number Diff line
@@ -52,8 +52,15 @@ enum scsi_device_state { 


enum scsi_device_event {

	SDEV_EVT_MEDIA_CHANGE	= 1,	/* media has changed */

	SDEV_EVT_INQUIRY_CHANGE_REPORTED,		/* 3F 03  UA reported */

	SDEV_EVT_CAPACITY_CHANGE_REPORTED,		/* 2A 09  UA reported */

	SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,	/* 38 07  UA reported */

	SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,	/* 2A 01  UA reported */

	SDEV_EVT_LUN_CHANGE_REPORTED,			/* 3F 0E  UA reported */



	SDEV_EVT_FIRST		= SDEV_EVT_MEDIA_CHANGE,

	SDEV_EVT_LAST		= SDEV_EVT_LUN_CHANGE_REPORTED,



	SDEV_EVT_LAST		= SDEV_EVT_MEDIA_CHANGE,

	SDEV_EVT_MAXBITS	= SDEV_EVT_LAST + 1

};
@@ -164,6 +171,7 @@ struct scsi_device { 
	atomic_t disk_events_disable_depth; /* disable depth for disk events */



	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */

	DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */

	struct list_head event_list;	/* asserted events */

	struct work_struct event_work;
@@ -261,6 +269,9 @@ struct scsi_target { 
						 * means no lun present. */

	unsigned int		no_report_luns:1;	/* Don't use

						 * REPORT LUNS for scanning. */

	unsigned int		expecting_lun_change:1;	/* A device has reported

						 * a 3F/0E UA, other devices on

						 * the same target will also. */

	/* commands actually active on LLD. protected by host lock. */

	unsigned int		target_busy;

	/*

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