Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

[safe/jmp/linux-2.6] / fs / jbd2 / transaction.c

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 48c21ba..46b4e34 100644 (file)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -743,6 +743,12 @@ done:
                source = kmap_atomic(page, KM_USER0);
                memcpy(jh->b_frozen_data, source+offset, jh2bh(jh)->b_size);
                kunmap_atomic(source, KM_USER0);
+
+               /*
+                * Now that the frozen data is saved off, we need to store
+                * any matching triggers.
+                */
+               jh->b_frozen_triggers = jh->b_triggers;
        }
        jbd_unlock_bh_state(bh);
 
@@ -946,6 +952,47 @@ out:
 }
 
 /**
+ * void jbd2_journal_set_triggers() - Add triggers for commit writeout
+ * @bh: buffer to trigger on
+ * @type: struct jbd2_buffer_trigger_type containing the trigger(s).
+ *
+ * Set any triggers on this journal_head.  This is always safe, because
+ * triggers for a committing buffer will be saved off, and triggers for
+ * a running transaction will match the buffer in that transaction.
+ *
+ * Call with NULL to clear the triggers.
+ */
+void jbd2_journal_set_triggers(struct buffer_head *bh,
+                              struct jbd2_buffer_trigger_type *type)
+{
+       struct journal_head *jh = bh2jh(bh);
+
+       jh->b_triggers = type;
+}
+
+void jbd2_buffer_commit_trigger(struct journal_head *jh, void *mapped_data,
+                               struct jbd2_buffer_trigger_type *triggers)
+{
+       struct buffer_head *bh = jh2bh(jh);
+
+       if (!triggers || !triggers->t_commit)
+               return;
+
+       triggers->t_commit(triggers, bh, mapped_data, bh->b_size);
+}
+
+void jbd2_buffer_abort_trigger(struct journal_head *jh,
+                              struct jbd2_buffer_trigger_type *triggers)
+{
+       if (!triggers || !triggers->t_abort)
+               return;
+
+       triggers->t_abort(triggers, jh2bh(jh));
+}
+
+
+
+/**
  * int jbd2_journal_dirty_metadata() -  mark a buffer as containing dirty metadata
  * @handle: transaction to add buffer to.
  * @bh: buffer to mark