From patchwork Thu Sep 3 08:01:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 257757 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2218EC43461 for ; Thu, 3 Sep 2020 08:13:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8DB421527 for ; Thu, 3 Sep 2020 08:13:39 +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="pkqGicGT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728831AbgICINd (ORCPT ); Thu, 3 Sep 2020 04:13:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728308AbgICIBu (ORCPT ); Thu, 3 Sep 2020 04:01:50 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 244AEC061246; Thu, 3 Sep 2020 01:01:50 -0700 (PDT) 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=b0kflq4gxR1uluB51eHU7Q3usZbi6mcYYVDY4IfwBFI=; b=pkqGicGT3B8OGmMrsMvqr2nwkA T3QnBUWlF49EreJ2Gfv07FmAp80WX7HA06PFLgsLhZV+9H4QhepWr6UdzIeK20DsBRo+IevuDnbSv Fte3NoasyiR+QJWMTjem/m4IHTcCgU6ucaN5aC9lQ2G6PjyKErBFjNNVz+2FXxQjB0TsP4elUu5Do qutD+QLjhmGMCPXKogCP6L4OiQiELNwG3YPEzKDi4taL4By2QXZ1jXtqfGi6W/rsZbg+n3vSvdNPW yi2g9joVKA/rC4p08Z0prA6yP8Ltp1uaGjXr2GEHU08Wt7GGPQTZnTpv6Gndx8NET+p24t9GIl/cQ WMUvzSxw==; Received: from [2001:4bb8:184:af1:c70:4a89:bc61:2] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kDkBi-0006dM-PD; Thu, 03 Sep 2020 08:01:43 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , Denis Efremov , "David S. Miller" , Song Liu , Al Viro , Finn Thain , Michael Schmitz , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-raid@vger.kernel.org, linux-scsi@vger.kernel.org, linux-m68k@lists.linux-m68k.org Subject: [PATCH 15/19] amiflop: use separate gendisks for Amiga vs MS-DOS mode Date: Thu, 3 Sep 2020 10:01:15 +0200 Message-Id: <20200903080119.441674-16-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200903080119.441674-1-hch@lst.de> References: <20200903080119.441674-1-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 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Use separate gendisks (which share a tag_set) for the native Amgiga vs the MS-DOS mode instead of redirecting the gendisk lookup using a probe callback. This avoids potential problems with aliased block_device instances and will eventually allow for removing the blk_register_region framework. Signed-off-by: Christoph Hellwig --- drivers/block/amiflop.c | 98 +++++++++++++++++++++++------------------ 1 file changed, 55 insertions(+), 43 deletions(-) diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c index 226219da3da6a7..de2bad8d1512f2 100644 --- a/drivers/block/amiflop.c +++ b/drivers/block/amiflop.c @@ -201,7 +201,7 @@ struct amiga_floppy_struct { int busy; /* true when drive is active */ int dirty; /* true when trackbuf is not on disk */ int status; /* current error code for unit */ - struct gendisk *gendisk; + struct gendisk *gendisk[2]; struct blk_mq_tag_set tag_set; }; @@ -1669,6 +1669,11 @@ static int floppy_open(struct block_device *bdev, fmode_t mode) return -EBUSY; } + if (unit[drive].type->code == FD_NODRIVE) { + mutex_unlock(&amiflop_mutex); + return -ENXIO; + } + if (mode & (FMODE_READ|FMODE_WRITE)) { check_disk_change(bdev); if (mode & FMODE_WRITE) { @@ -1695,7 +1700,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode) unit[drive].dtype=&data_types[system]; unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* data_types[system].sects*unit[drive].type->sect_mult; - set_capacity(unit[drive].gendisk, unit[drive].blocks); + set_capacity(unit[drive].gendisk[system], unit[drive].blocks); printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, unit[drive].type->name, data_types[system].name); @@ -1772,36 +1777,68 @@ static const struct blk_mq_ops amiflop_mq_ops = { .queue_rq = amiflop_queue_rq, }; -static struct gendisk *fd_alloc_disk(int drive) +static int fd_alloc_disk(int drive, int system) { struct gendisk *disk; disk = alloc_disk(1); if (!disk) goto out; - - disk->queue = blk_mq_init_sq_queue(&unit[drive].tag_set, &amiflop_mq_ops, - 2, BLK_MQ_F_SHOULD_MERGE); - if (IS_ERR(disk->queue)) { - disk->queue = NULL; + disk->queue = blk_mq_init_queue(&unit[drive].tag_set); + if (IS_ERR(disk->queue)) goto out_put_disk; - } + disk->major = FLOPPY_MAJOR; + disk->first_minor = drive + system; + disk->fops = &floppy_fops; + disk->events = DISK_EVENT_MEDIA_CHANGE; + if (system) + sprintf(disk->disk_name, "fd%d_msdos", drive); + else + sprintf(disk->disk_name, "fd%d", drive); + disk->private_data = &unit[drive]; + set_capacity(disk, 880 * 2); + + unit[drive].gendisk[system] = disk; + add_disk(disk); + return 0; + +out_put_disk: + disk->queue = NULL; + put_disk(disk); +out: + return -ENOMEM; +} + +static int fd_alloc_drive(int drive) +{ unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL); if (!unit[drive].trackbuf) - goto out_cleanup_queue; + goto out; - return disk; + memset(&unit[drive].tag_set, 0, sizeof(unit[drive].tag_set)); + unit[drive].tag_set.ops = &amiflop_mq_ops; + unit[drive].tag_set.nr_hw_queues = 1; + unit[drive].tag_set.nr_maps = 1; + unit[drive].tag_set.queue_depth = 2; + unit[drive].tag_set.numa_node = NUMA_NO_NODE; + unit[drive].tag_set.flags = BLK_MQ_F_SHOULD_MERGE; + if (blk_mq_alloc_tag_set(&unit[drive].tag_set)) + goto out_cleanup_trackbuf; -out_cleanup_queue: - blk_cleanup_queue(disk->queue); - disk->queue = NULL; + pr_cont(" fd%d", drive); + + if (fd_alloc_disk(drive, 0) || fd_alloc_disk(drive, 1)) + goto out_cleanup_tagset; + return 0; + +out_cleanup_tagset: blk_mq_free_tag_set(&unit[drive].tag_set); -out_put_disk: - put_disk(disk); +out_cleanup_trackbuf: + kfree(unit[drive].trackbuf); out: unit[drive].type->code = FD_NODRIVE; - return NULL; + return -ENOMEM; } static int __init fd_probe_drives(void) @@ -1812,29 +1849,16 @@ static int __init fd_probe_drives(void) drives=0; nomem=0; for(drive=0;drivecode == FD_NODRIVE) continue; - disk = fd_alloc_disk(drive); - if (!disk) { + if (fd_alloc_drive(drive) < 0) { pr_cont(" no mem for fd%d", drive); nomem = 1; continue; } - unit[drive].gendisk = disk; drives++; - - pr_cont(" fd%d",drive); - disk->major = FLOPPY_MAJOR; - disk->first_minor = drive; - disk->fops = &floppy_fops; - disk->events = DISK_EVENT_MEDIA_CHANGE; - sprintf(disk->disk_name, "fd%d", drive); - disk->private_data = &unit[drive]; - set_capacity(disk, 880*2); - add_disk(disk); } if ((drives > 0) || (nomem == 0)) { if (drives == 0) @@ -1846,15 +1870,6 @@ static int __init fd_probe_drives(void) return -ENOMEM; } -static struct kobject *floppy_find(dev_t dev, int *part, void *data) -{ - int drive = *part & 3; - if (unit[drive].type->code == FD_NODRIVE) - return NULL; - *part = 0; - return get_disk_and_module(unit[drive].gendisk); -} - static int __init amiga_floppy_probe(struct platform_device *pdev) { int i, ret; @@ -1884,9 +1899,6 @@ static int __init amiga_floppy_probe(struct platform_device *pdev) if (fd_probe_drives() < 1) /* No usable drives */ goto out_probe; - blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, - floppy_find, NULL, NULL); - /* initialize variables */ timer_setup(&motor_on_timer, motor_on_callback, 0); motor_on_timer.expires = 0;