The 'activate_complete' function needs to be executed after
stpg has finished, so we can as well execute stpg synchronously
and call the function directly.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 156 ++++++++++-------------------
1 file changed, 55 insertions(+), 101 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 7c66e4a..609691f 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -169,81 +169,28 @@ done:
}
/*
- * stpg_endio - Evaluate SET TARGET GROUP STATES
- * @sdev: the device to be evaluated
- * @state: the new target group state
- *
- * Evaluate a SET TARGET GROUP STATES command response.
- */
-static void stpg_endio(struct request *req, int error)
-{
- struct alua_dh_data *h = req->end_io_data;
- struct scsi_sense_hdr sense_hdr;
- unsigned err = SCSI_DH_OK;
-
- if (host_byte(req->errors) != DID_OK ||
- msg_byte(req->errors) != COMMAND_COMPLETE) {
- err = SCSI_DH_IO;
- goto done;
- }
-
- if (scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
- &sense_hdr)) {
- if (sense_hdr.sense_key == NOT_READY &&
- sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a) {
- /* ALUA state transition already in progress */
- err = SCSI_DH_OK;
- goto done;
- }
- if (sense_hdr.sense_key == UNIT_ATTENTION) {
- err = SCSI_DH_RETRY;
- goto done;
- }
- sdev_printk(KERN_INFO, h->sdev, "%s: stpg failed\n",
- ALUA_DH_NAME);
- scsi_print_sense_hdr(h->sdev, ALUA_DH_NAME, &sense_hdr);
- err = SCSI_DH_IO;
- } else if (error)
- err = SCSI_DH_IO;
-
- if (err == SCSI_DH_OK) {
- h->state = TPGS_STATE_OPTIMIZED;
- sdev_printk(KERN_INFO, h->sdev,
- "%s: port group %02x switched to state %c\n",
- ALUA_DH_NAME, h->group_id,
- print_alua_state(h->state));
- }
-done:
- req->end_io_data = NULL;
- __blk_put_request(req->q, req);
- if (h->callback_fn) {
- h->callback_fn(h->callback_data, err);
- h->callback_fn = h->callback_data = NULL;
- }
- return;
-}
-
-/*
* submit_stpg - Issue a SET TARGET GROUP STATES command
*
* Currently we're only setting the current target port group state
* to 'active/optimized' and let the array firmware figure out
* the states of the remaining groups.
*/
-static unsigned submit_stpg(struct alua_dh_data *h)
+static unsigned submit_stpg(struct scsi_device *sdev, int group_id,
+ unsigned char *sense)
{
struct request *rq;
+ unsigned char stpg_data[8];
int stpg_len = 8;
- struct scsi_device *sdev = h->sdev;
+ int err = 0;
/* Prepare the data buffer */
- memset(h->buff, 0, stpg_len);
- h->buff[4] = TPGS_STATE_OPTIMIZED & 0x0f;
- put_unaligned_be16(h->group_id, &h->buff[6]);
+ memset(stpg_data, 0, stpg_len);
+ stpg_data[4] = TPGS_STATE_OPTIMIZED & 0x0f;
+ put_unaligned_be16(group_id, &stpg_data[6]);
- rq = get_alua_req(sdev, h->buff, stpg_len, WRITE);
+ rq = get_alua_req(sdev, stpg_data, stpg_len, WRITE);
if (!rq)
- return SCSI_DH_RES_TEMP_UNAVAIL;
+ return DRIVER_BUSY << 24;
/* Prepare the command. */
rq->cmd[0] = MAINTENANCE_OUT;
@@ -251,13 +198,17 @@ static unsigned submit_stpg(struct alua_dh_data *h)
put_unaligned_be32(stpg_len, &rq->cmd[6]);
rq->cmd_len = COMMAND_SIZE(MAINTENANCE_OUT);
- rq->sense = h->sense;
+ rq->sense = sense;
memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
rq->sense_len = 0;
- rq->end_io_data = h;
- blk_execute_rq_nowait(rq->q, NULL, rq, 1, stpg_endio);
- return SCSI_DH_OK;
+ blk_execute_rq(rq->q, NULL, rq, 1);
+ if (rq->errors)
+ err = rq->errors;
+
+ blk_put_request(rq);
+
+ return err;
}
/*
@@ -582,59 +533,63 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
* alua_stpg - Issue a SET TARGET GROUP STATES command
*
* Issue a SET TARGET GROUP STATES command and evaluate the
- * response. Returns SCSI_DH_RETRY if the target port group
- * state is found to be in 'transitioning'.
- * If SCSI_DH_OK is returned the passed-in 'fn' function
- * this function will take care of executing 'fn'.
- * Otherwise 'fn' should be executed by the caller with the
- * returned error code.
+ * response. Returns SCSI_DH_RETRY per default to trigger
+ * a re-evaluation of the target group state or SCSI_DH_OK
+ * if no further action needs to be taken.
*/
-static unsigned alua_stpg(struct scsi_device *sdev, struct alua_dh_data *h,
- activate_complete fn, void *data)
+static unsigned alua_stpg(struct scsi_device *sdev, struct alua_dh_data *h)
{
- int err = SCSI_DH_OK;
- int stpg = 0;
-
- if (!(h->tpgs & TPGS_MODE_EXPLICIT))
- /* Only implicit ALUA supported */
- goto out;
+ int retval;
+ struct scsi_sense_hdr sense_hdr;
+ if (!(h->tpgs & TPGS_MODE_EXPLICIT)) {
+ /* Only implicit ALUA supported, retry */
+ return SCSI_DH_RETRY;
+ }
switch (h->state) {
+ case TPGS_STATE_OPTIMIZED:
+ return SCSI_DH_OK;
case TPGS_STATE_NONOPTIMIZED:
- stpg = 1;
if ((h->flags & ALUA_OPTIMIZE_STPG) &&
!h->pref &&
(h->tpgs & TPGS_MODE_IMPLICIT))
- stpg = 0;
+ return SCSI_DH_OK;
break;
case TPGS_STATE_STANDBY:
case TPGS_STATE_UNAVAILABLE:
- stpg = 1;
break;
case TPGS_STATE_OFFLINE:
- err = SCSI_DH_IO;
+ return SCSI_DH_IO;
break;
case TPGS_STATE_TRANSITIONING:
- err = SCSI_DH_RETRY;
break;
default:
+ sdev_printk(KERN_INFO, sdev,
+ "%s: stpg failed, unhandled TPGS state %d",
+ ALUA_DH_NAME, h->state);
+ return SCSI_DH_NOSYS;
break;
}
+ /* Set state to transitioning */
+ h->state = TPGS_STATE_TRANSITIONING;
+ retval = submit_stpg(sdev, h->group_id, h->sense);
- if (stpg) {
- h->callback_fn = fn;
- h->callback_data = data;
- err = submit_stpg(h);
- if (err != SCSI_DH_OK)
- h->callback_fn = h->callback_data = NULL;
- else
- fn = NULL;
+ if (retval) {
+ if (!scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
+ &sense_hdr)) {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: stpg failed, result %d",
+ ALUA_DH_NAME, retval);
+ if (driver_byte(retval) == DRIVER_BUSY)
+ return SCSI_DH_DEV_TEMP_BUSY;
+ } else {
+ sdev_printk(KERN_INFO, h->sdev, "%s: stpg failed\n",
+ ALUA_DH_NAME);
+ scsi_print_sense_hdr(sdev, ALUA_DH_NAME, &sense_hdr);
+ }
}
-out:
- if (fn)
- fn(data, err);
-
- return err;
+ /* Retry RTPG */
+ return SCSI_DH_RETRY;
}
/*
@@ -722,10 +677,9 @@ static int alua_activate(struct scsi_device *sdev,
if (optimize_stpg)
h->flags |= ALUA_OPTIMIZE_STPG;
- err = alua_stpg(sdev, h, fn, data);
-
+ err = alua_stpg(sdev, h);
out:
- if (err != SCSI_DH_OK && fn)
+ if (fn)
fn(data, err);
return 0;
}
--
1.8.5.6
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