From patchwork Tue Jan 10 15:06:13 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9507875 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4B416606E1 for ; Tue, 10 Jan 2017 15:06:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3D68D283F1 for ; Tue, 10 Jan 2017 15:06:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 32278285A0; Tue, 10 Jan 2017 15:06:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8A94A283F1 for ; Tue, 10 Jan 2017 15:06:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935432AbdAJPGv (ORCPT ); Tue, 10 Jan 2017 10:06:51 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:53220 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756377AbdAJPGt (ORCPT ); Tue, 10 Jan 2017 10:06:49 -0500 Received: from clnet-p099-196.ikbnet.co.at ([83.175.99.196] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.87 #1 (Red Hat Linux)) id 1cQy0c-0007SS-Tt; Tue, 10 Jan 2017 15:06:47 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Mike Snitzer , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, dm-devel@redhat.com, Hannes Reinecke , Hannes Reinecke Subject: [PATCH 08/15] scsi_dh_hp_sw: switch to scsi_execute_req_flags() Date: Tue, 10 Jan 2017 16:06:13 +0100 Message-Id: <1484060780-15592-9-git-send-email-hch@lst.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1484060780-15592-1-git-send-email-hch@lst.de> References: <1484060780-15592-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Hannes Reinecke 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 --- 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 308e871..be43c94 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; } @@ -105,131 +93,36 @@ static int tur_done(struct scsi_device *sdev, unsigned char *sense) */ 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 @@ static void start_stop_endio(struct request *req, int error) */ 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);