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authorHannes Reinecke <hare@suse.de>2016-02-19 11:17:15 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2016-02-24 05:27:02 +0300
commit9d2c30395213166e0b5614fe97576a789864e5de (patch)
tree1c7ac2db35b08e00a766478eb76dcd1293a191f0
parentc57168a1e15007e59fd2730678c7a6b28e8c7a37 (diff)
downloadlinux-9d2c30395213166e0b5614fe97576a789864e5de.tar.xz
scsi_dh_alua: Send TEST UNIT READY to poll for transitioning
Sending a 'REPORT TARGET PORT GROUP' command is a costly operation, as the array has to gather information about all ports. So instead of using RTPG to poll for a status update when a port is in transitioning we should be sending a TEST UNIT READY, and wait for the sense code to report success. Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Ewan Milne <emilne@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
-rw-r--r--drivers/scsi/device_handler/scsi_dh_alua.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 98d87d9765ab..3d8a254607e1 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -466,6 +466,30 @@ static int alua_check_sense(struct scsi_device *sdev,
}
/*
+ * alua_tur - Send a TEST UNIT READY
+ * @sdev: device to which the TEST UNIT READY command should be send
+ *
+ * Send a TEST UNIT READY to @sdev to figure out the device state
+ * Returns SCSI_DH_RETRY if the sense code is NOT READY/ALUA TRANSITIONING,
+ * SCSI_DH_OK if no error occurred, and SCSI_DH_IO otherwise.
+ */
+static int alua_tur(struct scsi_device *sdev)
+{
+ struct scsi_sense_hdr sense_hdr;
+ int retval;
+
+ retval = scsi_test_unit_ready(sdev, ALUA_FAILOVER_TIMEOUT * HZ,
+ ALUA_FAILOVER_RETRIES, &sense_hdr);
+ if (sense_hdr.sense_key == NOT_READY &&
+ sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a)
+ return SCSI_DH_RETRY;
+ else if (retval)
+ return SCSI_DH_IO;
+ else
+ return SCSI_DH_OK;
+}
+
+/*
* alua_rtpg - Evaluate REPORT TARGET GROUP STATES
* @sdev: the device to be evaluated.
*
@@ -732,8 +756,22 @@ static void alua_rtpg_work(struct work_struct *work)
alua_wq = kaluad_sync_wq;
pg->flags |= ALUA_PG_RUNNING;
if (pg->flags & ALUA_PG_RUN_RTPG) {
+ int state = pg->state;
+
pg->flags &= ~ALUA_PG_RUN_RTPG;
spin_unlock_irqrestore(&pg->lock, flags);
+ if (state == TPGS_STATE_TRANSITIONING) {
+ if (alua_tur(sdev) == SCSI_DH_RETRY) {
+ spin_lock_irqsave(&pg->lock, flags);
+ pg->flags &= ~ALUA_PG_RUNNING;
+ pg->flags |= ALUA_PG_RUN_RTPG;
+ spin_unlock_irqrestore(&pg->lock, flags);
+ queue_delayed_work(alua_wq, &pg->rtpg_work,
+ pg->interval * HZ);
+ return;
+ }
+ /* Send RTPG on failure or if TUR indicates SUCCESS */
+ }
err = alua_rtpg(sdev, pg);
spin_lock_irqsave(&pg->lock, flags);
if (err == SCSI_DH_RETRY || pg->flags & ALUA_PG_RUN_RTPG) {