Messages in this thread | | | Date | Mon, 5 Oct 2009 14:24:09 +0200 | From | Jan Kara <> | Subject | Re: [PATCH] ext3: Don't update superblock write time when filesystem is read-only |
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On Sat 03-10-09 23:12:38, Theodore Ts'o wrote: > 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. Thanks, the patch is queued in my queue already. I just held it for a while because Eric also had a valid point - maybe fsck is too strict when it forces a full filesystem check just because the superblock write time is in future? On a pc-class hw, clocks go often wrong. Even I remember setting system clock on my desktop a few hours back because it just gets out of sync and I don't run NTP... So I'm not against your patch because it can help in some cases and it's not a big deal but I think a proper fix would be in fsck...
Honza > > Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> > --- > fs/ext3/super.c | 13 ++++++++++++- > 1 files changed, 12 insertions(+), 1 deletions(-) > > diff --git a/fs/ext3/super.c b/fs/ext3/super.c > index 72743d3..7a520a8 100644 > --- a/fs/ext3/super.c > +++ b/fs/ext3/super.c > @@ -2321,7 +2321,18 @@ static int ext3_commit_super(struct super_block *sb, > > if (!sbh) > return error; > - 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_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); > es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); > BUFFER_TRACE(sbh, "marking dirty"); > -- > 1.6.4.4.2.g31f8e.dirty > -- Jan Kara <jack@suse.cz> SUSE Labs, CR
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