From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0C223C4321E for ; Tue, 15 Feb 2022 09:45:38 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id B0B4582B3E; Tue, 15 Feb 2022 09:45:38 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bd_SAcQNh-ov; Tue, 15 Feb 2022 09:45:37 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp1.osuosl.org (Postfix) with ESMTPS id 4CA41826C0; Tue, 15 Feb 2022 09:45:37 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 1D11AC0011; Tue, 15 Feb 2022 09:45:37 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id CFB46C000B for ; Tue, 15 Feb 2022 09:45:34 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id BDC6A4074E for ; Tue, 15 Feb 2022 09:45:34 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp2.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=infradead.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pz7A7j1ZeVvX for ; Tue, 15 Feb 2022 09:45:33 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by smtp2.osuosl.org (Postfix) with ESMTPS id E253C4052B for ; Tue, 15 Feb 2022 09:45:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=Ilg8MRKs3UhBiK+Mujp47+wrzj58nCf6OMRjMHqSUG8=; b=0Syc33e4E0l4xLIb5ubjxRLTpS wCmradLTHx1xhTcg8Sz4A/VpdbNeQJg6MTHl4MsmRUdhBnoKWsd4AdBslg5FU2Q1U97HiTvGubcpG IKzNJaH4uzghtVKRya+Xr47tk/4RCTuC2fOGwueAgxXWIu7/tw8kvhfUSKGyW7LgX+LGSKSd49HIq K88Gym8cSI50EIb8JCdPf4cDavFnuMNgrY7cfmVLLBJhUjFjYeORn5ECRjvskLxawtX7Vpa2lPPND CA3nNIUiR+sp0S4IlVdSV2q4yOBU8WrCTMIwWpSpVpeVLMW9h6cJhd/SKN9d7AXnwlViGAAlowlXy 3wd613Xg==; Received: from [2001:4bb8:184:543c:6bdf:22f4:7f0a:fe97] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJuOg-00262Y-HJ; Tue, 15 Feb 2022 09:45:23 +0000 From: Christoph Hellwig To: Jens Axboe Subject: [PATCH 2/5] memstick/ms_block: simplify refcounting Date: Tue, 15 Feb 2022 10:45:11 +0100 Message-Id: <20220215094514.3828912-3-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220215094514.3828912-1-hch@lst.de> References: <20220215094514.3828912-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Cc: Maxim Levitsky , Alex Dubov , "Michael S. Tsirkin" , linux-mmc@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-block@vger.kernel.org, Stefan Hajnoczi , Paolo Bonzini X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" Implement the ->free_disk method to free the msb_data structure only once the last gendisk reference goes away instead of keeping a local refcount. Signed-off-by: Christoph Hellwig --- drivers/memstick/core/ms_block.c | 64 ++++++++------------------------ drivers/memstick/core/ms_block.h | 1 - 2 files changed, 15 insertions(+), 50 deletions(-) diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c index 0cda6c6baefc3..3993bdd4b519c 100644 --- a/drivers/memstick/core/ms_block.c +++ b/drivers/memstick/core/ms_block.c @@ -1943,22 +1943,6 @@ static void msb_io_work(struct work_struct *work) static DEFINE_IDR(msb_disk_idr); /*set of used disk numbers */ static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */ -static int msb_bd_open(struct block_device *bdev, fmode_t mode) -{ - struct gendisk *disk = bdev->bd_disk; - struct msb_data *msb = disk->private_data; - - dbg_verbose("block device open"); - - mutex_lock(&msb_disk_lock); - - if (msb && msb->card) - msb->usage_count++; - - mutex_unlock(&msb_disk_lock); - return 0; -} - static void msb_data_clear(struct msb_data *msb) { kfree(msb->boot_page); @@ -1968,33 +1952,6 @@ static void msb_data_clear(struct msb_data *msb) msb->card = NULL; } -static int msb_disk_release(struct gendisk *disk) -{ - struct msb_data *msb = disk->private_data; - - dbg_verbose("block device release"); - mutex_lock(&msb_disk_lock); - - if (msb) { - if (msb->usage_count) - msb->usage_count--; - - if (!msb->usage_count) { - disk->private_data = NULL; - idr_remove(&msb_disk_idr, msb->disk_id); - put_disk(disk); - kfree(msb); - } - } - mutex_unlock(&msb_disk_lock); - return 0; -} - -static void msb_bd_release(struct gendisk *disk, fmode_t mode) -{ - msb_disk_release(disk); -} - static int msb_bd_getgeo(struct block_device *bdev, struct hd_geometry *geo) { @@ -2003,6 +1960,17 @@ static int msb_bd_getgeo(struct block_device *bdev, return 0; } +static void msb_bd_free_disk(struct gendisk *disk) +{ + struct msb_data *msb = disk->private_data; + + mutex_lock(&msb_disk_lock); + idr_remove(&msb_disk_idr, msb->disk_id); + mutex_unlock(&msb_disk_lock); + + kfree(msb); +} + static blk_status_t msb_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd) { @@ -2096,10 +2064,9 @@ static void msb_start(struct memstick_dev *card) } static const struct block_device_operations msb_bdops = { - .open = msb_bd_open, - .release = msb_bd_release, - .getgeo = msb_bd_getgeo, - .owner = THIS_MODULE + .owner = THIS_MODULE, + .getgeo = msb_bd_getgeo, + .free_disk = msb_bd_free_disk, }; static const struct blk_mq_ops msb_mq_ops = { @@ -2147,7 +2114,6 @@ static int msb_init_disk(struct memstick_dev *card) set_capacity(msb->disk, capacity); dbg("Set total disk size to %lu sectors", capacity); - msb->usage_count = 1; msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM); INIT_WORK(&msb->io_work, msb_io_work); sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1); @@ -2229,7 +2195,7 @@ static void msb_remove(struct memstick_dev *card) msb_data_clear(msb); mutex_unlock(&msb_disk_lock); - msb_disk_release(msb->disk); + put_disk(msb->disk); memstick_set_drvdata(card, NULL); } diff --git a/drivers/memstick/core/ms_block.h b/drivers/memstick/core/ms_block.h index 122e1a8a8bd5b..7058f9aefeb92 100644 --- a/drivers/memstick/core/ms_block.h +++ b/drivers/memstick/core/ms_block.h @@ -143,7 +143,6 @@ struct ms_boot_page { } __packed; struct msb_data { - unsigned int usage_count; struct memstick_dev *card; struct gendisk *disk; struct request_queue *queue; -- 2.30.2 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization