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SubjectRe: [PATCH] ext3: Don't update superblock write time when filesystem is read-only
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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