On Sun 14-04-13 23:01:35, Dmitry Monakhov wrote:
> Inode's data or non journaled quota may be written w/o jounral so we must
> send a barrier at the end of ext4_sync_fs. But it can be skipped if journal
> commit will do it for us.
>
> Also fix data integrity for nojournal mode.
Looks good, just some nits below.
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index cfe0aca..35de8a0 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -668,14 +668,30 @@ int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid)
> * may or may not have sent the barrier. Used to avoid sending barrier
> * twice in common cases.
> */
> -int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid)
> +int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t *wait_tid)
I don't like the pointer for wait_tid. It looks somewhat confusing. Can't
we just either create a function to return the last transaction's tid and
pass that value to jbd2_trans_will_send_data_barrier() or create another
function without 'tid' argument which would take the last transaction?
Honza
> {
> int ret = 0;
> transaction_t *commit_trans;
> + tid_t tid;
>
> if (!(journal->j_flags & JBD2_BARRIER))
> return 0;
> read_lock(&journal->j_state_lock);
> +
> + /* Caller want to wait some specific transaction? */
> + if (wait_tid)
> + tid = *wait_tid;
> + else {
> + /* Most recent uncommitted transaction */
> + if (journal->j_running_transaction) {
> + ret = 1;
> + goto out;
> + }
> + if (!journal->j_commit_sequence) {
> + goto out;
> + }
> + tid = journal->j_commit_sequence;
> + }
> /* Transaction already committed? */
> if (tid_geq(journal->j_commit_sequence, tid))
> goto out;
> diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
> index 7b38517..8d77790 100644
> --- a/include/linux/jbd2.h
> +++ b/include/linux/jbd2.h
> @@ -1203,7 +1203,7 @@ int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);
> int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
> int jbd2_complete_transaction(journal_t *journal, tid_t tid);
> int jbd2_log_do_checkpoint(journal_t *journal);
> -int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid);
> +int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t *tid);
>
> void __jbd2_log_wait_for_space(journal_t *journal);
> extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
> --
> 1.7.1
>
--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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