linux-ext4 - Re: buggy_init_scritps and e2fsprogs 1.41.9

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Message-ID: <20090910213226.GB6705@mit.edu>
Date:	Thu, 10 Sep 2009 17:32:26 -0400
From:	Theodore Tso <tytso@....edu>
To:	Stephan Kulow <coolo@...e.de>
Cc:	linux-ext4@...r.kernel.org,
	Scott James Remnant <scott@...onical.com>
Subject: Re: buggy_init_scritps and e2fsprogs 1.41.9

Oops, I sent the wrong version of the patch; it had a stupid typo in
it... (s/s_flag/s_flags).

							- Ted

commit 54c90e88b955b94de94d7d730ee8d53daa64453f
Author: Theodore Ts'o <tytso@....edu>
Date:   Thu Sep 10 17:31:04 2009 -0400

    ext4: Don't update superblock write time when filesystem is read-only
    
    This avoids updating the superblock write time when we are mounting
    the root file system read/only but we need to replay the journal; at
    that point, for people who are east of GMT and who make their clock
    tick in localtime for Windows bug-for-bug compatibility, and this will
    cause e2fsck to complain and force a full file system check.
    
    Signed-off-by: "Theodore Ts'o" <tytso@....edu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f644a5c..9f87707 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3244,7 +3244,18 @@ static int ext4_commit_super(struct super_block *sb, int sync)
 		clear_buffer_write_io_error(sbh);
 		set_buffer_uptodate(sbh);
 	}
-	es->s_wtime = cpu_to_le32(get_seconds());
+	/*
+	 * If the file system is mounted read-only, don't update the
+	 * superblock write time.  This avoids updating the superblock
+	 * write time when we are mounting the root file system
+	 * read/only but we need to replay the journal; at that point,
+	 * for people who are east of GMT and who make their clock
+	 * tick in localtime for Windows bug-for-bug compatibility,
+	 * the clock is set in the future, and this will cause e2fsck
+	 * to complain and force a full file system check.
+	 */
+	if (!(sb->s_flags & MS_RDONLY))
+		es->s_wtime = cpu_to_le32(get_seconds());
 	es->s_kbytes_written =
 		cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 
 			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
--
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