From patchwork Thu Nov 21 17:13:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michal Suchanek X-Patchwork-Id: 11256581 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9E9EC930 for ; Thu, 21 Nov 2019 17:13:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 876EA206DA for ; Thu, 21 Nov 2019 17:13:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726279AbfKURNw (ORCPT ); Thu, 21 Nov 2019 12:13:52 -0500 Received: from mx2.suse.de ([195.135.220.15]:54298 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727197AbfKURNp (ORCPT ); Thu, 21 Nov 2019 12:13:45 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 11510B2A1; Thu, 21 Nov 2019 17:13:44 +0000 (UTC) From: Michal Suchanek To: linux-scsi@vger.kernel.org, linux-block@vger.kernel.org Cc: Michal Suchanek , Jonathan Corbet , Jens Axboe , "James E.J. Bottomley" , "Martin K. Petersen" , Alexander Viro , Eric Biggers , "J. Bruce Fields" , Mauro Carvalho Chehab , Benjamin Coddington , Ming Lei , Chaitanya Kulkarni , Bart Van Assche , Damien Le Moal , Hou Tao , Pavel Begunkov , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Jan Kara , Hannes Reinecke , "Ewan D. Milne" , Christoph Hellwig , Matthew Wilcox Subject: [PATCH v4 10/10] scsi: sr: wait for the medium to become ready Date: Thu, 21 Nov 2019 18:13:17 +0100 Message-Id: X-Mailer: git-send-email 2.23.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Use the autoclose function provided by cdrom driver to wait for drive to close in open_finish, and attempt to open once more after the door closes. Signed-off-by: Michal Suchanek --- v3: use function call rather than IOCTL v4: fix reference leak on -ENXIO --- drivers/scsi/sr.c | 54 ++++++++++++++++++++++++++++++++++++----------- 1 file changed, 42 insertions(+), 12 deletions(-) diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 07c319494bf4..41ddf08b4c7b 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -522,29 +522,58 @@ static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) return ret; } -static int sr_block_open(struct block_device *bdev, fmode_t mode) +static int __sr_block_open(struct block_device *bdev, fmode_t mode) { - struct scsi_cd *cd; - struct scsi_device *sdev; - int ret = -ENXIO; - - cd = scsi_cd_get(bdev->bd_disk); - if (!cd) - goto out; + struct scsi_cd *cd = scsi_cd(bdev->bd_disk); + int ret; - sdev = cd->device; - scsi_autopm_get_device(sdev); check_disk_change(bdev); mutex_lock(&sr_mutex); ret = cdrom_open(&cd->cdi, bdev, mode); mutex_unlock(&sr_mutex); + return ret; +} + +static int sr_block_open(struct block_device *bdev, fmode_t mode) +{ + struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk); + struct scsi_device *sdev; + int ret; + + if (!cd) + return -ENXIO; + + sdev = cd->device; + scsi_autopm_get_device(sdev); + ret = __sr_block_open(bdev, mode); scsi_autopm_put_device(sdev); - if (ret) + + if ((ret == -ERESTARTSYS) || (ret == -ENXIO)) scsi_cd_put(cd); -out: + return ret; +} + +static int sr_block_open_finish(struct block_device *bdev, fmode_t mode, + int ret) +{ + struct scsi_cd *cd = scsi_cd(bdev->bd_disk); + + /* wait for drive to get ready */ + if ((ret == -ENOMEDIUM) && !(mode & FMODE_NDELAY)) { + struct scsi_device *sdev = cd->device; + /* + * Cannot use sr_block_ioctl because it locks sr_mutex blocking + * out any processes trying to access the drive + */ + scsi_autopm_get_device(sdev); + cdrom_autoclose(&cd->cdi); + ret = __sr_block_open(bdev, mode); + scsi_autopm_put_device(sdev); + } + return ret; } @@ -640,6 +669,7 @@ static const struct block_device_operations sr_bdops = { .owner = THIS_MODULE, .open = sr_block_open, + .open_finish = sr_block_open_finish, .release = sr_block_release, .ioctl = sr_block_ioctl, .check_events = sr_block_check_events,