From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754673AbcIEBTN convert rfc822-to-8bit (ORCPT ); Sun, 4 Sep 2016 21:19:13 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:52079 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754128AbcIEBTL (ORCPT ); Sun, 4 Sep 2016 21:19:11 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="10591071" From: Zhao Lei To: "'Sean Fu'" , CC: , , , , References: <1472990010-10707-1-git-send-email-fxinrong@gmail.com> In-Reply-To: <1472990010-10707-1-git-send-email-fxinrong@gmail.com> Subject: RE: [PATCH] Btrfs: remove unnecessary code of chunk_root assignment in btrfs_read_chunk_tree. Date: Mon, 5 Sep 2016 09:19:05 +0800 Message-ID: <002501d20713$7ee67050$7cb350f0$@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQGQ+DLfzt79FsdQS2DM0IIxrZ01RaDsNNrg Content-Language: zh-cn X-yoursite-MailScanner-ID: B47C1403C868.AC3D1 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: zhaolei@cn.fujitsu.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Sean Fu > From: Sean Fu [mailto:fxinrong@gmail.com] > Sent: Sunday, September 04, 2016 7:54 PM > To: dsterba@suse.com > Cc: clm@fb.com; anand.jain@oracle.com; fdmanana@suse.com; > zhaolei@cn.fujitsu.com; linux-btrfs@vger.kernel.org; > linux-kernel@vger.kernel.org; Sean Fu > Subject: [PATCH] Btrfs: remove unnecessary code of chunk_root assignment in > btrfs_read_chunk_tree. > > The input argument root is already set with "fs_info->chunk_root". > "chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info)" in caller > "open_ctree". > “root->fs_info = fs_info” in "btrfs_alloc_root". > The root argument of this function means "any root". And the function is designed getting chunk root from "any root" in head. Since there is only one caller of this function, and the caller always send chunk_root as root argument in current code, we can remove above conversion, and I suggest renaming root to chunk_root to make it clear, something like: - btrfs_read_chunk_tree(struct btrfs_root *root) + btrfs_read_chunk_tree(struct btrfs_root *chunk_root) Thanks Zhaolei > Signed-off-by: Sean Fu > --- > fs/btrfs/volumes.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c > index 366b335..384a6d2 100644 > --- a/fs/btrfs/volumes.c > +++ b/fs/btrfs/volumes.c > @@ -6600,8 +6600,6 @@ int btrfs_read_chunk_tree(struct btrfs_root *root) > int ret; > int slot; > > - root = root->fs_info->chunk_root; > - > path = btrfs_alloc_path(); > if (!path) > return -ENOMEM; > -- > 2.6.2 >