From patchwork Mon Sep 21 07:19:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11788521 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 25D626CA for ; Mon, 21 Sep 2020 07:22:01 +0000 (UTC) Received: from aserp2120.oracle.com (aserp2120.oracle.com [141.146.126.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DDC61206B2 for ; Mon, 21 Sep 2020 07:22:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DDC61206B2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=ocfs2-devel-bounces@oss.oracle.com Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08L7J5oU078002; Mon, 21 Sep 2020 07:21:25 GMT Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 33n9xkkv16-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 21 Sep 2020 07:21:25 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08L7LJST126126; Mon, 21 Sep 2020 07:21:24 GMT Received: from oss.oracle.com (oss-old-reserved.oracle.com [137.254.22.2]) by userp3030.oracle.com with ESMTP id 33nuwvkus5-1 (version=TLSv1 cipher=AES256-SHA bits=256 verify=NO); Mon, 21 Sep 2020 07:21:24 +0000 Received: from localhost ([127.0.0.1] helo=lb-oss.oracle.com) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1kKG8Z-0001tw-Jm; Mon, 21 Sep 2020 00:21:23 -0700 Received: from aserp3030.oracle.com ([141.146.126.71]) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1kKG7e-0001mu-Ch for ocfs2-devel@oss.oracle.com; Mon, 21 Sep 2020 00:20:26 -0700 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08L7KN0D178764 for ; Mon, 21 Sep 2020 07:20:26 GMT Received: from userp2030.oracle.com (userp2030.oracle.com [156.151.31.89]) by aserp3030.oracle.com with ESMTP id 33nujk992g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 21 Sep 2020 07:20:26 +0000 Received: from pps.filterd (userp2030.oracle.com [127.0.0.1]) by userp2030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08L7ExsZ032886 for ; Mon, 21 Sep 2020 07:20:25 GMT Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by userp2030.oracle.com with ESMTP id 33n81gaawa-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Mon, 21 Sep 2020 07:20:23 +0000 Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKG7B-0003F5-Dd; Mon, 21 Sep 2020 07:19:57 +0000 From: Christoph Hellwig To: Jens Axboe Date: Mon, 21 Sep 2020 09:19:51 +0200 Message-Id: <20200921071958.307589-8-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921071958.307589-1-hch@lst.de> References: <20200921071958.307589-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-PDR: PASS X-Source-IP: 90.155.50.34 X-ServerName: casper.infradead.org X-Proofpoint-SPF-Result: None X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9750 signatures=668679 X-Proofpoint-Spam-Details: rule=tap_notspam policy=tap score=0 lowpriorityscore=0 spamscore=0 impostorscore=0 clxscore=56 phishscore=0 priorityscore=48 mlxscore=0 malwarescore=0 adultscore=0 bulkscore=0 mlxlogscore=692 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009210051 X-Spam: Clean Cc: linux-ide@vger.kernel.org, Len Brown , Jan Hoeppner , Minchan Kim , linux-s390@vger.kernel.org, linux-pm@vger.kernel.org, "Rafael J. Wysocki" , Josef Bacik , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, Stefan Haberland , Pavel Machek , linux-fsdevel@vger.kernel.org, nbd@other.debian.org, ocfs2-devel@oss.oracle.com Subject: [Ocfs2-devel] [PATCH 07/14] raw: don't keep unopened block device around X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9750 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 phishscore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009210052 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9750 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 adultscore=0 spamscore=0 clxscore=1034 mlxlogscore=999 bulkscore=0 mlxscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009210052 Turn binding into a normal dev_t as the struct block device doesn't buy us anything and use blkdev_open_by_dev to actually open it. Signed-off-by: Christoph Hellwig --- drivers/char/raw.c | 51 +++++++++++++++++----------------------------- 1 file changed, 19 insertions(+), 32 deletions(-) diff --git a/drivers/char/raw.c b/drivers/char/raw.c index ccf5bd528642da..5d52a1f4738c76 100644 --- a/drivers/char/raw.c +++ b/drivers/char/raw.c @@ -28,7 +28,8 @@ #include struct raw_device_data { - struct block_device *binding; + dev_t binding; + struct block_device *bdev; int inuse; }; @@ -73,14 +74,15 @@ static int raw_open(struct inode *inode, struct file *filp) /* * All we need to do on open is check that the device is bound. */ - bdev = raw_devices[minor].binding; err = -ENODEV; - if (!bdev) + if (!raw_devices[minor].binding) goto out; - bdgrab(bdev); - err = blkdev_get(bdev, filp->f_mode | FMODE_EXCL, raw_open); - if (err) + bdev = blkdev_get_by_dev(raw_devices[minor].binding, + filp->f_mode | FMODE_EXCL, raw_open); + if (IS_ERR(bdev)) { + err = PTR_ERR(bdev); goto out; + } err = set_blocksize(bdev, bdev_logical_block_size(bdev)); if (err) goto out1; @@ -90,6 +92,7 @@ static int raw_open(struct inode *inode, struct file *filp) file_inode(filp)->i_mapping = bdev->bd_inode->i_mapping; filp->private_data = bdev; + raw_devices[minor].bdev = bdev; mutex_unlock(&raw_mutex); return 0; @@ -110,7 +113,7 @@ static int raw_release(struct inode *inode, struct file *filp) struct block_device *bdev; mutex_lock(&raw_mutex); - bdev = raw_devices[minor].binding; + bdev = raw_devices[minor].bdev; if (--raw_devices[minor].inuse == 0) /* Here inode->i_mapping == bdev->bd_inode->i_mapping */ inode->i_mapping = &inode->i_data; @@ -133,6 +136,7 @@ raw_ioctl(struct file *filp, unsigned int command, unsigned long arg) static int bind_set(int number, u64 major, u64 minor) { dev_t dev = MKDEV(major, minor); + dev_t raw = MKDEV(RAW_MAJOR, number); struct raw_device_data *rawdev; int err = 0; @@ -166,25 +170,17 @@ static int bind_set(int number, u64 major, u64 minor) mutex_unlock(&raw_mutex); return -EBUSY; } - if (rawdev->binding) { - bdput(rawdev->binding); + if (rawdev->binding) module_put(THIS_MODULE); - } + + rawdev->binding = dev; if (!dev) { /* unbind */ - rawdev->binding = NULL; - device_destroy(raw_class, MKDEV(RAW_MAJOR, number)); + device_destroy(raw_class, raw); } else { - rawdev->binding = bdget(dev); - if (rawdev->binding == NULL) { - err = -ENOMEM; - } else { - dev_t raw = MKDEV(RAW_MAJOR, number); - __module_get(THIS_MODULE); - device_destroy(raw_class, raw); - device_create(raw_class, NULL, raw, NULL, - "raw%d", number); - } + __module_get(THIS_MODULE); + device_destroy(raw_class, raw); + device_create(raw_class, NULL, raw, NULL, "raw%d", number); } mutex_unlock(&raw_mutex); return err; @@ -192,18 +188,9 @@ static int bind_set(int number, u64 major, u64 minor) static int bind_get(int number, dev_t *dev) { - struct raw_device_data *rawdev; - struct block_device *bdev; - if (number <= 0 || number >= max_raw_minors) return -EINVAL; - - rawdev = &raw_devices[number]; - - mutex_lock(&raw_mutex); - bdev = rawdev->binding; - *dev = bdev ? bdev->bd_dev : 0; - mutex_unlock(&raw_mutex); + *dev = raw_devices[number].binding; return 0; }