> By using an atomic_t for t_updates and t_outstanding credits, this
> should allow us to not need to take transaction t_handle_lock in
> jbd2_journal_stop().
>
> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
The patch looks OK to me besides:
@@ -426,15 +429,14 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, int gfp_mask)
* First unlink the handle from its current transaction, and start the
* commit on that.
*/
- J_ASSERT(transaction->t_updates > 0);
+ J_ASSERT(atomic_read(&transaction->t_updates) > 0);
J_ASSERT(journal_current_handle() == handle);
spin_lock(&journal->j_state_lock);
spin_lock(&transaction->t_handle_lock);
- transaction->t_outstanding_credits -= handle->h_buffer_credits;
- transaction->t_updates--;
-
- if (!transaction->t_updates)
+ atomic_sub(handle->h_buffer_credits,
+ &transaction->t_outstanding_credits);
+ if (atomic_dec_and_test(&transaction->t_updates))
After this a transaction can disappear so subsequent __jbd2_log_start_commit shouldn't
dereference transaction->t_tid, right?
Honza
--
Jan Kara <jack@xxxxxxx>
SuSE CR Labs
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