From: "Darrick J. Wong" Subject: [PATCH 03/47] debugfs: Optionally ignore bad checksums Date: Sat, 08 Oct 2011 00:33:35 -0700 Message-ID: <20111008073335.17888.24215.stgit@elm3c44.beaverton.ibm.com> References: <20111008073315.17888.22132.stgit@elm3c44.beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Sunil Mushran , Amir Goldstein , Andi Kleen , Mingming Cao , Joel Becker , linux-ext4@vger.kernel.org, Coly Li To: Andreas Dilger , Theodore Tso , "Darrick J. Wong" Return-path: Received: from e36.co.us.ibm.com ([32.97.110.154]:56771 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751495Ab1JHHgc (ORCPT ); Sat, 8 Oct 2011 03:36:32 -0400 Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e36.co.us.ibm.com (8.14.4/8.13.1) with ESMTP id p987Ta6e010698 for ; Sat, 8 Oct 2011 01:29:36 -0600 Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p987Xbud168836 for ; Sat, 8 Oct 2011 01:33:37 -0600 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p987Xa82009573 for ; Sat, 8 Oct 2011 01:33:37 -0600 In-Reply-To: <20111008073315.17888.22132.stgit@elm3c44.beaverton.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: If someone is debugging a badly damaged filesystem, it might be useful to disable the checksum verifications that will otherwise prevent the filesystem from loading. Signed-off-by: Darrick J. Wong --- debugfs/debugfs.8.in | 7 ++++++- debugfs/debugfs.c | 5 ++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/debugfs/debugfs.8.in b/debugfs/debugfs.8.in index fe07f34..b5d208f 100644 --- a/debugfs/debugfs.8.in +++ b/debugfs/debugfs.8.in @@ -8,7 +8,7 @@ debugfs \- ext2/ext3/ext4 file system debugger .SH SYNOPSIS .B debugfs [ -.B \-DVwci +.B \-DVwcin ] [ .B \-b @@ -48,6 +48,11 @@ file system (e.g /dev/hdXX). Specifies that the file system should be opened in read-write mode. Without this option, the file system is opened in read-only mode. .TP +.I \-n +Disables metadata checksum verification. This should only be used if +you believe the metadata to be correct despite the complaints of +e2fsprogs. +.TP .I \-c Specifies that the file system should be opened in catastrophic mode, in which the inode and group bitmaps are not read initially. This can be diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c index dd1435b..32a5864 100644 --- a/debugfs/debugfs.c +++ b/debugfs/debugfs.c @@ -2269,7 +2269,7 @@ int main(int argc, char **argv) fprintf (stderr, "%s %s (%s)\n", debug_prog_name, E2FSPROGS_VERSION, E2FSPROGS_DATE); - while ((c = getopt (argc, argv, "iwcR:f:b:s:Vd:D")) != EOF) { + while ((c = getopt(argc, argv, "niwcR:f:b:s:Vd:D")) != EOF) { switch (c) { case 'R': request = optarg; @@ -2283,6 +2283,9 @@ int main(int argc, char **argv) case 'i': open_flags |= EXT2_FLAG_IMAGE_FILE; break; + case 'n': + open_flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS; + break; case 'w': open_flags |= EXT2_FLAG_RW; break;