[PATCH 09/17] scsi_dh_alua: switch to scsi_execute()

Hannes Reinecke
2015-05-04T12:42:40Z

All commands are issued synchronously, so no need to open-code
scsi_execute anymore.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 119 +++++++----------------------
1 file changed, 26 insertions(+), 93 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 0b8e111..0cc18e3 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -103,80 +103,29 @@ 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,
+static int submit_rtpg(struct scsi_device *sdev, unsigned char *buff,
int bufflen, unsigned char *sense, int flags)
{
- struct request *rq;
- int err;
-
- rq = get_alua_req(sdev, buff, bufflen, READ);
- if (!rq) {
- err = DRIVER_BUSY << 24;
- goto done;
- }
+ u8 cdb[16];
+ int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;

/* Prepare the command. */
- rq->cmd[0] = MAINTENANCE_IN;
+ memset(cdb, 0x0, 16);
+ 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;
- rq->cmd[6] = (bufflen >> 24) & 0xff;
- rq->cmd[7] = (bufflen >> 16) & 0xff;
- rq->cmd[8] = (bufflen >> 8) & 0xff;
- rq->cmd[9] = bufflen & 0xff;
- rq->cmd_len = COMMAND_SIZE(MAINTENANCE_IN);
-
- rq->sense = sense;
- memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
- rq->sense_len = 0;
-
- err = blk_execute_rq(rq->q, NULL, rq, 1);
- if (err < 0) {
- if (!rq->errors)
- err = DID_ERROR << 16;
- else
- err = rq->errors;
- if (rq->sense_len)
- err |= (DRIVER_SENSE << 24);
- }
- blk_put_request(rq);
-done:
- return err;
+ cdb[1] = MI_REPORT_TARGET_PGS;
+ put_unaligned_be32(bufflen, &cdb[6]);
+
+ return scsi_execute(sdev, cdb, DMA_FROM_DEVICE, buff, bufflen,
+ sense, ALUA_FAILOVER_TIMEOUT * HZ,
+ ALUA_FAILOVER_RETRIES, req_flags, NULL);
}

/*
@@ -186,45 +135,29 @@ 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,
+ unsigned char *sense)
{
- struct request *rq;
+ u8 cdb[COMMAND_SIZE(MAINTENANCE_OUT)];
unsigned char stpg_data[8];
int stpg_len = 8;
- int err;
+ 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 SCSI_DH_RES_TEMP_UNAVAIL;
-
/* 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;
-
- err = blk_execute_rq(rq->q, NULL, rq, 1);
- if (err < 0) {
- if (!rq->errors)
- err = DID_ERROR << 16;
- else
- err = rq->errors;
- if (rq->sense_len)
- err |= (DRIVER_SENSE << 24);
- }
- 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(sdev, cdb, DMA_TO_DEVICE, stpg_data, stpg_len,
+ sense, ALUA_FAILOVER_TIMEOUT * HZ,
+ ALUA_FAILOVER_RETRIES, req_flags, NULL);
}

/*
--
1.8.5.2