From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Resent-Message-ID: <20170227150254.uvfqyp5oz5afij2h@eorzea.usersys.redhat.com> Resent-To: sandeen@sandeen.net Received: from mail-pf0-f178.google.com ([209.85.192.178]:35406 "EHLO mail-pf0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284AbdB0CNT (ORCPT ); Sun, 26 Feb 2017 21:13:19 -0500 Received: by mail-pf0-f178.google.com with SMTP id j5so3354068pfb.2 for ; Sun, 26 Feb 2017 18:11:49 -0800 (PST) From: "Halsey Pian" References: In-Reply-To: Subject: With respect to XFS Bitmap flush to disk Date: Mon, 27 Feb 2017 10:11:44 +0800 Message-ID: <004e01d2909e$d9ce1580$8d6a4080$@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Language: zh-cn Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: linux-xfs@vger.kernel.org Cc: halsey.pian@gmail.com Dear All, Recently, I try to read analyze the bitmap of XFS file system, it seems = that I cannot read the latest bitmap from hard disk involving the XFS, = and cannot read the accurate info even after a long time. For example, i = cannot get the relevant bitmap info after I add/delete a big file = to/from XFS file system. I tried several solution, and find it out that I must execute xfs_freeze = for the XFS partition in CentOS7, and it seems that xfs_freeze = doesn=E2=80=99t work for XFS version included in Redhat6.5, I must = umount/mount the xfs, then I can get the latest bitmap info related to = the latest data located in disk. What strategy does XFS use to cache/flush bitmap to hard disk? How can = I get the accurate bitmap info especially for Redhat6 series Operating = System? Could you please give help on it? Thanks in advance! =E2=98=BA Halsey Pian=20