From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp2120.oracle.com ([156.151.31.85]:33482 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752537AbeC0XiY (ORCPT ); Tue, 27 Mar 2018 19:38:24 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w2RNTcPf022075 for ; Tue, 27 Mar 2018 23:38:24 GMT Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2120.oracle.com with ESMTP id 2gyyp7g0yq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 27 Mar 2018 23:38:24 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w2RNcNBM028938 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 27 Mar 2018 23:38:23 GMT Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id w2RNcNKL010181 for ; Tue, 27 Mar 2018 23:38:23 GMT From: Anand Jain To: linux-btrfs@vger.kernel.org Subject: [PATCH 8/8] btrfs: drop the redundant invalidate_bdev() Date: Wed, 28 Mar 2018 07:39:59 +0800 Message-Id: <20180327234000.23656-9-anand.jain@oracle.com> In-Reply-To: <20180327234000.23656-1-anand.jain@oracle.com> References: <20180327234000.23656-1-anand.jain@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: During the mount context btrfs_open_devices() calls invalidate_bdev() for all the devices. So drop the invalidate_bdev() in open_ctree() which is only for the btrfs_fs_devices::latest_bdev. The call trace is as shown below. btrfs_mount_root() | |_btrfs_parse_early_options (-o device only) | |_btrfs_scan_one_device | |_btrfs_read_disk_super() | |_read_cache_page_gfp() | |_btrfs_scan_one_device(mount-arg-dev only) | |_btrfs_read_disk_super() | |_read_cache_page_gfp() | | |_btrfs_open_devices(fsid:all) | |_btrfs_open_one_device() | |_btrfs_get_bdev_and_sb() <--- invalidate_bdev(fsid:all) | |_btrfs_read_dev_super() | |_btrfs_read_dev_one_super() | |___bread() | |_btrfs_fill_super() |_btrfs_open_ctree() <-- invalidate_bdev(latest_bdev) <-- redundant |_btrfs_read_dev_super(latest_bdev only) |_btrfs_read_dev_one_super(latest_bdev only) |___bread(latest_bdev) Signed-off-by: Anand Jain --- fs/btrfs/disk-io.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 110465bec775..628c2b1d1349 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2553,8 +2553,6 @@ int open_ctree(struct super_block *sb, __setup_root(tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID); - invalidate_bdev(fs_devices->latest_bdev); - /* * Read super block and check the signature bytes only */ -- 2.7.0