On Thu, 2015-08-27 at 14:41 +0200, Hannes Reinecke wrote:
> 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.
>
> Signed-off-by: Hannes Reinecke <h...@suse.de>
> ---
> drivers/scsi/device_handler/scsi_dh_alua.c | 124
> ++++++++---------------------
> 1 file changed, 34 insertions(+), 90 deletions(-)
>
> diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c
> b/drivers/scsi/device_handler/scsi_dh_alua.c
> index fd0385e..ef4363a 100644
> --- a/drivers/scsi/device_handler/scsi_dh_alua.c
> +++ b/drivers/scsi/device_handler/scsi_dh_alua.c
> @@ -75,8 +75,6 @@ struct alua_dh_data {
> unsigned char *buff;
> int bufflen;
> unsigned char transition_tmo;
> - unsigned char sense[SCSI_SENSE_BUFFERSIZE];
> - int senselen;
> struct scsi_device *sdev;
> activate_complete callback_fn;
> void *callback_data;
> @@ -103,72 +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[16];
See below.
> + int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
> + REQ_FAILFAST_DRIVER;
>
> /* Prepare the command. */
> - rq->cmd[0] = MAINTENANCE_IN;
> + memset(cdb, 0x0, 16);
See below.
> + 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;
> + cdb[1] = MI_REPORT_TARGET_PGS;
> + put_unaligned_be32(bufflen, &cdb[6]);
>
> - blk_execute_rq(rq->q, NULL, rq, 1);
> - if (rq->errors)
> - err = rq->errors;
> -
> - blk_put_request(rq);
> -done:
> - return err;
> + return scsi_execute_req_flags(sdev, cdb, DMA_FROM_DEVICE,
> + buff, bufflen, sshdr,
> + ALUA_FAILOVER_TIMEOUT * HZ,
> + ALUA_FAILOVER_RETRIES, NULL, req_flags);
> }
>
> /*
> @@ -178,40 +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));
See below.
> + 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);
> }
>
> /*
> @@ -447,15 +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)
> err = SCSI_DH_DEV_TEMP_BUSY;
> else
> err = SCSI_DH_IO;
> @@ -616,15 +561,14 @@ 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",
u8 cdb[16] and u8 cdb[COMMAND_SIZE(MAINTENANCE_OUT)] in submit_rtpg/submit_stpg
should be consistent. I would stick with COMMAND_SIZE. 16 is wrong, RTPG is
a 12-byte MAINTENANCE_IN service action.
memset() of cdb in submit_rtpg/submit_stpg should use sizeof(cdb) rather than
a hardcoded value.
Reviewed-by: Ewan D. Milne <emi...@redhat.com>
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