From patchwork Tue Mar 8 06:15:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12773022 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2B22C4167D for ; Tue, 8 Mar 2022 06:16:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344425AbiCHGRK (ORCPT ); Tue, 8 Mar 2022 01:17:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233516AbiCHGRG (ORCPT ); Tue, 8 Mar 2022 01:17:06 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5AE3B2983E; Mon, 7 Mar 2022 22:16:07 -0800 (PST) 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=65M9RGvfTEdoESGQ8HI9llwe00//SU6OqRRRlO7q3zI=; b=1Vc1SLRvx8/ljDdsRvqK3U+S9Y wRONMlig+Lc7Yk1OJ10VRqGCr2rVpUel8Av6Ab6tKn/b2qgoBswruCpt6QtYvL0vax+sMT5NiZR0+ ssXhtLh1MIr0nBivEcg8YXSO/sFwv3aIa+CyJL3CkzktoM3HCuYH+tnVQ+R5tJT5kaLI0bAjWuvOa YfKJy3lY1/IbIsF5A2aLYl5HLnu6Zdf0RBMQ3HGrTXocKiYGXoPrmZ3f3nYBQj4M2NJ586X0H7g4q 6eY3hfsaeoVBT4WViNB2LbwHWOdsPSCZ/LF9CzUCN+M9st+9yBrUqdqgiFgxvVJ2wqgckRn57Ngi2 Y5p4paGA==; Received: from [2001:4bb8:184:7746:6f50:7a98:3141:c37b] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nRT8W-002lVU-KM; Tue, 08 Mar 2022 06:15:57 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Coly Li , Mike Snitzer , Song Liu , "Martin K. Petersen" , Josef Bacik , David Sterba , Phillip Lougher , linux-block@vger.kernel.org, dm-devel@redhat.com, linux-kernel@vger.kernel.org, linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org, target-devel@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH 1/5] btrfs: simplify ->flush_bio handling Date: Tue, 8 Mar 2022 07:15:47 +0100 Message-Id: <20220308061551.737853-2-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220308061551.737853-1-hch@lst.de> References: <20220308061551.737853-1-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 Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org Use and embedded bios that is initialized when used instead of bio_kmalloc plus bio_reset. Signed-off-by: Christoph Hellwig Reviewed-by: David Sterba Reviewed-by: Chaitanya Kulkarni --- fs/btrfs/disk-io.c | 8 +++++--- fs/btrfs/volumes.c | 11 ----------- fs/btrfs/volumes.h | 4 ++-- 3 files changed, 7 insertions(+), 16 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 505ba21230b1f..7d4229c769ac6 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -4127,6 +4127,7 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors) */ static void btrfs_end_empty_barrier(struct bio *bio) { + bio_uninit(bio); complete(bio->bi_private); } @@ -4136,7 +4137,7 @@ static void btrfs_end_empty_barrier(struct bio *bio) */ static void write_dev_flush(struct btrfs_device *device) { - struct bio *bio = device->flush_bio; + struct bio *bio = &device->flush_bio; #ifndef CONFIG_BTRFS_FS_CHECK_INTEGRITY /* @@ -4154,7 +4155,8 @@ static void write_dev_flush(struct btrfs_device *device) return; #endif - bio_reset(bio, device->bdev, REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH); + bio_init(bio, device->bdev, NULL, 0, + REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH); bio->bi_end_io = btrfs_end_empty_barrier; init_completion(&device->flush_wait); bio->bi_private = &device->flush_wait; @@ -4168,7 +4170,7 @@ static void write_dev_flush(struct btrfs_device *device) */ static blk_status_t wait_dev_flush(struct btrfs_device *device) { - struct bio *bio = device->flush_bio; + struct bio *bio = &device->flush_bio; if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state)) return BLK_STS_OK; diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index b07d382d53a86..7015b3096f724 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -405,7 +405,6 @@ void btrfs_free_device(struct btrfs_device *device) WARN_ON(!list_empty(&device->post_commit_list)); rcu_string_free(device->name); extent_io_tree_release(&device->alloc_state); - bio_put(device->flush_bio); btrfs_destroy_dev_zone_info(device); kfree(device); } @@ -6962,16 +6961,6 @@ struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, if (!dev) return ERR_PTR(-ENOMEM); - /* - * Preallocate a bio that's always going to be used for flushing device - * barriers and matches the device lifespan - */ - dev->flush_bio = bio_kmalloc(GFP_KERNEL, 0); - if (!dev->flush_bio) { - kfree(dev); - return ERR_PTR(-ENOMEM); - } - INIT_LIST_HEAD(&dev->dev_list); INIT_LIST_HEAD(&dev->dev_alloc_list); INIT_LIST_HEAD(&dev->post_commit_list); diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 005c9e2a491a1..dbd6cc5e5cd3b 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -116,8 +116,8 @@ struct btrfs_device { /* bytes used on the current transaction */ u64 commit_bytes_used; - /* for sending down flush barriers */ - struct bio *flush_bio; + /* Bio used for flushing device barriers */ + struct bio flush_bio; struct completion flush_wait; /* per-device scrub information */