linux-ext4 - Re: [PATCH] jbd2: Always set journal superblock checksum when writing out superblock

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Date:	Fri, 10 May 2013 22:56:15 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	Theodore Ts'o <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] jbd2: Always set journal superblock checksum when writing out superblock

On 2013-05-10, at 17:40, "Darrick J. Wong" <darrick.wong@...cle.com> wrote:

> Add a few missing calls to jbd2_superblock_csum_set just prior to calling
> jbd2_write_superblock.  This fixes complaints about corrupt journals if
> metadata checksumming and journal checksumming are both enabled.

Why not just put this call inside jbd2_write_superblock()?

Cheers, Andreas

> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> ---
> fs/jbd2/journal.c |    2 ++
> 1 file changed, 2 insertions(+)
> 
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index b6cdc57..a4c7678 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -1348,6 +1348,7 @@ void jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid,
> 
>    sb->s_sequence = cpu_to_be32(tail_tid);
>    sb->s_start    = cpu_to_be32(tail_block);
> +    jbd2_superblock_csum_set(journal, sb);
> 
>    jbd2_write_superblock(journal, write_op);
> 
> @@ -1381,6 +1382,7 @@ static void jbd2_mark_journal_empty(journal_t *journal)
> 
>    sb->s_sequence = cpu_to_be32(journal->j_tail_sequence);
>    sb->s_start    = cpu_to_be32(0);
> +    jbd2_superblock_csum_set(journal, sb);
>    read_unlock(&journal->j_state_lock);
> 
>    jbd2_write_superblock(journal, WRITE_FUA);
> --
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