From 80e1836cf94e0c9a410c1e31302b1d61bf5b7363 Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Thu, 3 Nov 2016 14:20:23 +0100 Subject: [PATCH] scsi_dh_hp_sw: switch to scsi_execute_req_flags() Switch to scsi_execute_req_flags() instead of using the block interface directly. This will set REQ_QUIET and REQ_PREEMPT, but this is okay as we're evaluating the errors anyway and should be able to send the command even if the device is quiesced. Signed-off-by: Hannes Reinecke Signed-off-by: Christoph Hellwig Acked-by: Martin K. Petersen Signed-off-by: Jens Axboe --- drivers/scsi/device_handler/scsi_dh_hp_sw.c | 222 ++++++-------------- 1 file changed, 65 insertions(+), 157 deletions(-) diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c index 308e87195dc1..be43c940636d 100644 --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c @@ -38,13 +38,10 @@ #define HP_SW_PATH_PASSIVE 1 struct hp_sw_dh_data { - unsigned char sense[SCSI_SENSE_BUFFERSIZE]; int path_state; int retries; int retry_cnt; struct scsi_device *sdev; - activate_complete callback_fn; - void *callback_data; }; static int hp_sw_start_stop(struct hp_sw_dh_data *); @@ -56,43 +53,34 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *); * * Returns SCSI_DH_DEV_OFFLINED if the sdev is on the passive path */ -static int tur_done(struct scsi_device *sdev, unsigned char *sense) +static int tur_done(struct scsi_device *sdev, struct hp_sw_dh_data *h, + struct scsi_sense_hdr *sshdr) { - struct scsi_sense_hdr sshdr; - int ret; + int ret = SCSI_DH_IO; - ret = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr); - if (!ret) { - sdev_printk(KERN_WARNING, sdev, - "%s: sending tur failed, no sense available\n", - HP_SW_NAME); - ret = SCSI_DH_IO; - goto done; - } - switch (sshdr.sense_key) { + switch (sshdr->sense_key) { case UNIT_ATTENTION: ret = SCSI_DH_IMM_RETRY; break; case NOT_READY: - if ((sshdr.asc == 0x04) && (sshdr.ascq == 2)) { + if (sshdr->asc == 0x04 && sshdr->ascq == 2) { /* * LUN not ready - Initialization command required * * This is the passive path */ - ret = SCSI_DH_DEV_OFFLINED; + h->path_state = HP_SW_PATH_PASSIVE; + ret = SCSI_DH_OK; break; } /* Fallthrough */ default: sdev_printk(KERN_WARNING, sdev, "%s: sending tur failed, sense %x/%x/%x\n", - HP_SW_NAME, sshdr.sense_key, sshdr.asc, - sshdr.ascq); + HP_SW_NAME, sshdr->sense_key, sshdr->asc, + sshdr->ascq); break; } - -done: return ret; } @@ -105,130 +93,35 @@ done: */ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h) { - struct request *req; - int ret; + unsigned char cmd[6] = { TEST_UNIT_READY }; + struct scsi_sense_hdr sshdr; + int ret = SCSI_DH_OK, res; + u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | + REQ_FAILFAST_DRIVER; retry: - req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); - if (IS_ERR(req)) - return SCSI_DH_RES_TEMP_UNAVAIL; - - blk_rq_set_block_pc(req); - req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | - REQ_FAILFAST_DRIVER; - req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY); - req->cmd[0] = TEST_UNIT_READY; - req->timeout = HP_SW_TIMEOUT; - req->sense = h->sense; - memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); - req->sense_len = 0; - - ret = blk_execute_rq(req->q, NULL, req, 1); - if (ret == -EIO) { - if (req->sense_len > 0) { - ret = tur_done(sdev, h->sense); - } else { + res = scsi_execute_req_flags(sdev, cmd, DMA_NONE, NULL, 0, &sshdr, + HP_SW_TIMEOUT, HP_SW_RETRIES, + NULL, req_flags, 0); + if (res) { + if (scsi_sense_valid(&sshdr)) + ret = tur_done(sdev, h, &sshdr); + else { sdev_printk(KERN_WARNING, sdev, "%s: sending tur failed with %x\n", - HP_SW_NAME, req->errors); + HP_SW_NAME, res); ret = SCSI_DH_IO; } } else { h->path_state = HP_SW_PATH_ACTIVE; ret = SCSI_DH_OK; } - if (ret == SCSI_DH_IMM_RETRY) { - blk_put_request(req); + if (ret == SCSI_DH_IMM_RETRY) goto retry; - } - if (ret == SCSI_DH_DEV_OFFLINED) { - h->path_state = HP_SW_PATH_PASSIVE; - ret = SCSI_DH_OK; - } - - blk_put_request(req); return ret; } -/* - * start_done - Handle START STOP UNIT return status - * @sdev: sdev the command has been sent to - * @errors: blk error code - */ -static int start_done(struct scsi_device *sdev, unsigned char *sense) -{ - struct scsi_sense_hdr sshdr; - int rc; - - rc = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr); - if (!rc) { - sdev_printk(KERN_WARNING, sdev, - "%s: sending start_stop_unit failed, " - "no sense available\n", - HP_SW_NAME); - return SCSI_DH_IO; - } - switch (sshdr.sense_key) { - case NOT_READY: - if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) { - /* - * LUN not ready - manual intervention required - * - * Switch-over in progress, retry. - */ - rc = SCSI_DH_RETRY; - break; - } - /* fall through */ - default: - sdev_printk(KERN_WARNING, sdev, - "%s: sending start_stop_unit failed, sense %x/%x/%x\n", - HP_SW_NAME, sshdr.sense_key, sshdr.asc, - sshdr.ascq); - rc = SCSI_DH_IO; - } - - return rc; -} - -static void start_stop_endio(struct request *req, int error) -{ - struct hp_sw_dh_data *h = req->end_io_data; - unsigned err = SCSI_DH_OK; - - if (error || host_byte(req->errors) != DID_OK || - msg_byte(req->errors) != COMMAND_COMPLETE) { - sdev_printk(KERN_WARNING, h->sdev, - "%s: sending start_stop_unit failed with %x\n", - HP_SW_NAME, req->errors); - err = SCSI_DH_IO; - goto done; - } - - if (req->sense_len > 0) { - err = start_done(h->sdev, h->sense); - if (err == SCSI_DH_RETRY) { - err = SCSI_DH_IO; - if (--h->retry_cnt) { - blk_put_request(req); - err = hp_sw_start_stop(h); - if (err == SCSI_DH_OK) - return; - } - } - } -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; - -} - /* * hp_sw_start_stop - Send START STOP UNIT command * @sdev: sdev command should be sent to @@ -237,26 +130,48 @@ done: */ static int hp_sw_start_stop(struct hp_sw_dh_data *h) { - struct request *req; - - req = blk_get_request(h->sdev->request_queue, WRITE, GFP_ATOMIC); - if (IS_ERR(req)) - return SCSI_DH_RES_TEMP_UNAVAIL; - - blk_rq_set_block_pc(req); - req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | - REQ_FAILFAST_DRIVER; - req->cmd_len = COMMAND_SIZE(START_STOP); - req->cmd[0] = START_STOP; - req->cmd[4] = 1; /* Start spin cycle */ - req->timeout = HP_SW_TIMEOUT; - req->sense = h->sense; - memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); - req->sense_len = 0; - req->end_io_data = h; + unsigned char cmd[6] = { START_STOP, 0, 0, 0, 1, 0 }; + struct scsi_sense_hdr sshdr; + struct scsi_device *sdev = h->sdev; + int res, rc = SCSI_DH_OK; + int retry_cnt = HP_SW_RETRIES; + u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | + REQ_FAILFAST_DRIVER; - blk_execute_rq_nowait(req->q, NULL, req, 1, start_stop_endio); - return SCSI_DH_OK; +retry: + res = scsi_execute_req_flags(sdev, cmd, DMA_NONE, NULL, 0, &sshdr, + HP_SW_TIMEOUT, HP_SW_RETRIES, + NULL, req_flags, 0); + if (res) { + if (!scsi_sense_valid(&sshdr)) { + sdev_printk(KERN_WARNING, sdev, + "%s: sending start_stop_unit failed, " + "no sense available\n", HP_SW_NAME); + return SCSI_DH_IO; + } + switch (sshdr.sense_key) { + case NOT_READY: + if (sshdr.asc == 0x04 && sshdr.ascq == 3) { + /* + * LUN not ready - manual intervention required + * + * Switch-over in progress, retry. + */ + if (--retry_cnt) + goto retry; + rc = SCSI_DH_RETRY; + break; + } + /* fall through */ + default: + sdev_printk(KERN_WARNING, sdev, + "%s: sending start_stop_unit failed, " + "sense %x/%x/%x\n", HP_SW_NAME, + sshdr.sense_key, sshdr.asc, sshdr.ascq); + rc = SCSI_DH_IO; + } + } + return rc; } static int hp_sw_prep_fn(struct scsi_device *sdev, struct request *req) @@ -290,15 +205,8 @@ static int hp_sw_activate(struct scsi_device *sdev, ret = hp_sw_tur(sdev, h); - if (ret == SCSI_DH_OK && h->path_state == HP_SW_PATH_PASSIVE) { - h->retry_cnt = h->retries; - h->callback_fn = fn; - h->callback_data = data; + if (ret == SCSI_DH_OK && h->path_state == HP_SW_PATH_PASSIVE) ret = hp_sw_start_stop(h); - if (ret == SCSI_DH_OK) - return 0; - h->callback_fn = h->callback_data = NULL; - } if (fn) fn(data, ret); -- 2.20.1