> On Wed, 23 Jan 2008 20:09:43 +0100 Jan Kara <jack@xxxxxxx> wrote:
>
> Commit block is expected to have several copies of the header. Fix the
> bug Andrew has spotted ages ago.
>
"ages" indeed.
>
> diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
> index 610264b..a69b240 100644
> --- a/fs/jbd/commit.c
> +++ b/fs/jbd/commit.c
> @@ -116,9 +116,8 @@ static int journal_write_commit_record(journal_t *journal,
>
> bh = jh2bh(descriptor);
>
> - /* AKPM: buglet - add `i' to tmp! */
> for (i = 0; i < bh->b_size; i += 512) {
> - journal_header_t *tmp = (journal_header_t*)bh->b_data;
> + journal_header_t *tmp = (journal_header_t*)(bh->b_data+i);
> tmp->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER);
> tmp->h_blocktype = cpu_to_be32(JFS_COMMIT_BLOCK);
> tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid);
But I don't think we can _use_ this feature now. Because there are
100000000000 disks out there which didn't implement it.
So why not just remove the loop and do a single write?
-
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