From patchwork Thu Sep 17 16:57:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11783081 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 1B000139A for ; Thu, 17 Sep 2020 17:15:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B370D221EC for ; Thu, 17 Sep 2020 17:15:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ORRt5MKK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B370D221EC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D4DF66B0080; Thu, 17 Sep 2020 13:15:06 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id CFEF86B0082; Thu, 17 Sep 2020 13:15:06 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BED966B0083; Thu, 17 Sep 2020 13:15:06 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0041.hostedemail.com [216.40.44.41]) by kanga.kvack.org (Postfix) with ESMTP id AA3606B0080 for ; Thu, 17 Sep 2020 13:15:06 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 728C58249980 for ; Thu, 17 Sep 2020 17:15:06 +0000 (UTC) X-FDA: 77273203812.27.fold48_5010b6027124 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin27.hostedemail.com (Postfix) with ESMTP id 4A7723D668 for ; Thu, 17 Sep 2020 17:15:06 +0000 (UTC) X-Spam-Summary: 1,0,0,4d38cfb6b5dcea23,d41d8cd98f00b204,batv+c88049fb72e75cdfbebb+6234+infradead.org+hch@casper.srs.infradead.org,,RULES_HIT:41:69:355:379:541:800:960:973:988:989:1260:1311:1314:1345:1359:1437:1515:1535:1543:1711:1730:1747:1777:1792:2393:2559:2562:3138:3139:3140:3141:3142:3355:3865:3867:3868:3871:3872:3874:4039:4321:4605:5007:6261:6653:6742:9592:10004:11026:11658:11914:12043:12160:12296:12297:12438:12517:12519:12555:12683:12895:13894:14110:14181:14394:14721:21080:21220:21451:21627:21987:21990:30034:30054:30070:30090,0,RBL:90.155.50.34:@casper.srs.infradead.org:.lbl8.mailshell.net-62.8.15.100 64.201.201.201;04yfbpwfsc94imesghnzwyxjrhkeaop6thkrzrcj31pnjdiefhqmenamfurhupq.i6y4q8n15ct1b9i34wnjna8n16a1nw1hf4p7beyx74gsp5r1hg3d88epdtjac34.q-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: fold48_5010b6027124 X-Filterd-Recvd-Size: 5837 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf10.hostedemail.com (Postfix) with ESMTP for ; Thu, 17 Sep 2020 17:15:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=OOOyqbfGBfADtTd2OFjO0d+j7/uUOQY5tAGUzrpX3bI=; b=ORRt5MKKZE1a7tEe+EqgJQPMiw q80Zt28VgUFf4COG0BxYMD6goAGTR6QbmxD4kB0As5TKbbnXDLnA2+hGHfbLdS1stxrHHkQbLo1My hxKxgrc08cIVuJOwaTDMKWk02CMmaMZjV6Vc+SelGVAo5CSFReaEl9Vs1n7KHG1lbdZJ/8FxWe2n0 3yu9Jwb58lKTb3qHumLGdJcz4CPHg/tbJ5DC/yxixuWtwKGlOvaaMexlA7j9d6K9p7rdbsWkf16It vRo0LQcOOt6EXPuh3rdvappPHcMGbZDWT/A2HdJ3FAUqOnnfuxqSuLAbSk1kP4ABlocfJtnUjErLo c+JgCvxQ==; Received: from 089144214092.atnat0023.highway.a1.net ([89.144.214.92] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kIxUg-0001TE-BL; Thu, 17 Sep 2020 17:14:50 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Josef Bacik , Minchan Kim , Stefan Haberland , Jan Hoeppner , Joseph Qi , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Andrew Morton , linux-kernel@vger.kernel.org, nbd@other.debian.org, linux-ide@vger.kernel.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org Subject: [PATCH 07/14] raw: don't keep unopened block device around Date: Thu, 17 Sep 2020 18:57:13 +0200 Message-Id: <20200917165720.3285256-8-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200917165720.3285256-1-hch@lst.de> References: <20200917165720.3285256-1-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-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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; }