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authorEwan D. Milne <emilne@redhat.com>2013-08-08 19:07:48 (GMT)
committerJames Bottomley <JBottomley@Parallels.com>2013-08-26 14:52:27 (GMT)
commit279afdfe78a020b4b1a68bffd0009b961b12982e (patch)
treec6562e5d1b0292a4b59764ad7feccb47e48088a5 /drivers/scsi/scsi_error.c
parentf8813d260eebb8c5d046ba4950a134c2283606a7 (diff)
downloadlinux-279afdfe78a020b4b1a68bffd0009b961b12982e.tar.xz
[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: Ewan D. Milne <emilne@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/scsi_error.c')
-rw-r--r--drivers/scsi/scsi_error.c100
1 files changed, 80 insertions, 20 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index a46c3dd..83e591b 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -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;
@@ -315,6 +385,14 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
}
}
/*
+ * 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;