All commands are issued synchronously, so no need to open-code
scsi_execute_req_flags() anymore. And we can get rid of the
static sense code structure element. scsi_execute_req_flags()
will be setting REQ_QUIET and REQ_PREEMPT, but that is
perfectly fine as we're evaluating and logging any errors
ourselves and we really need to send the command even if
the device is quiesced.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Ewan Milne <emilne@xxxxxxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 125 +++++++++--------------------
1 file changed, 36 insertions(+), 89 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index b645593..b72cea6 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -75,7 +75,6 @@ struct alua_dh_data {
unsigned char *buff;
int bufflen;
unsigned char transition_tmo;
- unsigned char sense[SCSI_SENSE_BUFFERSIZE];
struct scsi_device *sdev;
activate_complete callback_fn;
void *callback_data;
@@ -102,71 +101,30 @@ static int realloc_buffer(struct alua_dh_data *h, unsigned len)
return 0;
}
-static struct request *get_alua_req(struct scsi_device *sdev,
- void *buffer, unsigned buflen, int rw)
-{
- struct request *rq;
- struct request_queue *q = sdev->request_queue;
-
- rq = blk_get_request(q, rw, GFP_NOIO);
-
- if (IS_ERR(rq)) {
- sdev_printk(KERN_INFO, sdev,
- "%s: blk_get_request failed\n", __func__);
- return NULL;
- }
- blk_rq_set_block_pc(rq);
-
- if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
- blk_put_request(rq);
- sdev_printk(KERN_INFO, sdev,
- "%s: blk_rq_map_kern failed\n", __func__);
- return NULL;
- }
-
- rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
- REQ_FAILFAST_DRIVER;
- rq->retries = ALUA_FAILOVER_RETRIES;
- rq->timeout = ALUA_FAILOVER_TIMEOUT * HZ;
-
- return rq;
-}
-
/*
* submit_rtpg - Issue a REPORT TARGET GROUP STATES command
* @sdev: sdev the command should be sent to
*/
-static unsigned submit_rtpg(struct scsi_device *sdev, unsigned char *buff,
- int bufflen, unsigned char *sense, int flags)
+static int submit_rtpg(struct scsi_device *sdev, unsigned char *buff,
+ int bufflen, struct scsi_sense_hdr *sshdr, int flags)
{
- struct request *rq;
- int err = 0;
-
- rq = get_alua_req(sdev, buff, bufflen, READ);
- if (!rq) {
- err = DRIVER_BUSY << 24;
- goto done;
- }
+ u8 cdb[COMMAND_SIZE(MAINTENANCE_IN)];
+ int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;
/* Prepare the command. */
- rq->cmd[0] = MAINTENANCE_IN;
+ memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_IN));
+ cdb[0] = MAINTENANCE_IN;
if (!(flags & ALUA_RTPG_EXT_HDR_UNSUPP))
- rq->cmd[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT;
+ cdb[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT;
else
- rq->cmd[1] = MI_REPORT_TARGET_PGS;
- put_unaligned_be32(bufflen, &rq->cmd[6]);
- rq->cmd_len = COMMAND_SIZE(MAINTENANCE_IN);
-
- rq->sense = sense;
- memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
- rq->sense_len = 0;
-
- blk_execute_rq(rq->q, NULL, rq, 1);
- if (rq->errors)
- err = rq->errors;
- blk_put_request(rq);
-done:
- return err;
+ cdb[1] = MI_REPORT_TARGET_PGS;
+ put_unaligned_be32(bufflen, &cdb[6]);
+
+ return scsi_execute_req_flags(sdev, cdb, DMA_FROM_DEVICE,
+ buff, bufflen, sshdr,
+ ALUA_FAILOVER_TIMEOUT * HZ,
+ ALUA_FAILOVER_RETRIES, NULL, req_flags);
}
/*
@@ -176,40 +134,30 @@ done:
* to 'active/optimized' and let the array firmware figure out
* the states of the remaining groups.
*/
-static unsigned submit_stpg(struct scsi_device *sdev, int group_id,
- unsigned char *sense)
+static int submit_stpg(struct scsi_device *sdev, int group_id,
+ struct scsi_sense_hdr *sshdr)
{
- struct request *rq;
+ u8 cdb[COMMAND_SIZE(MAINTENANCE_OUT)];
unsigned char stpg_data[8];
int stpg_len = 8;
- int err = 0;
+ int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;
/* Prepare the data buffer */
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, stpg_data, stpg_len, WRITE);
- if (!rq)
- return DRIVER_BUSY << 24;
-
/* Prepare the command. */
- rq->cmd[0] = MAINTENANCE_OUT;
- rq->cmd[1] = MO_SET_TARGET_PGS;
- put_unaligned_be32(stpg_len, &rq->cmd[6]);
- rq->cmd_len = COMMAND_SIZE(MAINTENANCE_OUT);
-
- rq->sense = sense;
- memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
- rq->sense_len = 0;
-
- blk_execute_rq(rq->q, NULL, rq, 1);
- if (rq->errors)
- err = rq->errors;
-
- blk_put_request(rq);
-
- return err;
+ memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_OUT));
+ cdb[0] = MAINTENANCE_OUT;
+ cdb[1] = MO_SET_TARGET_PGS;
+ put_unaligned_be32(stpg_len, &cdb[6]);
+
+ return scsi_execute_req_flags(sdev, cdb, DMA_TO_DEVICE,
+ stpg_data, stpg_len,
+ sshdr, ALUA_FAILOVER_TIMEOUT * HZ,
+ ALUA_FAILOVER_RETRIES, NULL, req_flags);
}
/*
@@ -445,14 +393,14 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
expiry = round_jiffies_up(jiffies + h->transition_tmo * HZ);
retry:
- retval = submit_rtpg(sdev, h->buff, h->bufflen, h->sense, h->flags);
+ retval = submit_rtpg(sdev, h->buff, h->bufflen, &sense_hdr, h->flags);
+
if (retval) {
- if (!scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
- &sense_hdr)) {
+ if (!scsi_sense_valid(&sense_hdr)) {
sdev_printk(KERN_INFO, sdev,
"%s: rtpg failed, result %d\n",
ALUA_DH_NAME, retval);
- if (driver_byte(retval) == DRIVER_BUSY)
+ if (driver_byte(retval) == DRIVER_ERROR)
return SCSI_DH_DEV_TEMP_BUSY;
return SCSI_DH_IO;
}
@@ -611,15 +559,14 @@ static unsigned alua_stpg(struct scsi_device *sdev, struct alua_dh_data *h)
}
/* Set state to transitioning */
h->state = TPGS_STATE_TRANSITIONING;
- retval = submit_stpg(sdev, h->group_id, h->sense);
+ retval = submit_stpg(sdev, h->group_id, &sense_hdr);
if (retval) {
- if (!scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
- &sense_hdr)) {
+ if (!scsi_sense_valid(&sense_hdr)) {
sdev_printk(KERN_INFO, sdev,
"%s: stpg failed, result %d",
ALUA_DH_NAME, retval);
- if (driver_byte(retval) == DRIVER_BUSY)
+ if (driver_byte(retval) == DRIVER_ERROR)
return SCSI_DH_DEV_TEMP_BUSY;
} else {
sdev_printk(KERN_INFO, h->sdev, "%s: stpg failed\n",
--
1.8.5.6
--
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