2 files changed, 39 insertions, 0 deletions

diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index f36645745489..34456476e761 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1008,6 +1008,35 @@ int __jbd2_journal_clean_checkpoint_list(journal_t *journal);
 int __jbd2_journal_remove_checkpoint(struct journal_head *);
 void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);
 
+
+/*
+ * Triggers
+ */
+
+struct jbd2_buffer_trigger_type {
+        /*
+         * Fired just before a buffer is written to the journal.
+         * mapped_data is a mapped buffer that is the frozen data for
+         * commit.
+         */
+        void (*t_commit)(struct jbd2_buffer_trigger_type *type,
+                         struct buffer_head *bh, void *mapped_data,
+                         size_t size);
+
+        /*
+         * Fired during journal abort for dirty buffers that will not be
+         * committed.
+         */
+        void (*t_abort)(struct jbd2_buffer_trigger_type *type,
+                        struct buffer_head *bh);
+};
+
+extern void jbd2_buffer_commit_trigger(struct journal_head *jh,
+                                       void *mapped_data,
+                                       struct jbd2_buffer_trigger_type *triggers);
+extern void jbd2_buffer_abort_trigger(struct journal_head *jh,
+                                      struct jbd2_buffer_trigger_type *triggers);
+
 /* Buffer IO */
 extern int
 jbd2_journal_write_metadata_buffer(transaction_t          *transaction,
@@ -1046,6 +1075,8 @@ extern int	 jbd2_journal_extend (handle_t *, int nblocks);
 extern int       jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
 extern int       jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
 extern int       jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
+void             jbd2_journal_set_triggers(struct buffer_head *,
+                                           struct jbd2_buffer_trigger_type *type);
 extern int       jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
 extern void      jbd2_journal_release_buffer (handle_t *, struct buffer_head *);
 extern int       jbd2_journal_forget (handle_t *, struct buffer_head *);
diff --git a/include/linux/journal-head.h b/include/linux/journal-head.h
index bb70ebb6a2d5..525aac3c97df 100644
--- a/include/linux/journal-head.h
+++ b/include/linux/journal-head.h
@@ -12,6 +12,8 @@
 
 typedef unsigned int            tid_t;          /* Unique transaction ID */
 typedef struct transaction_s    transaction_t;  /* Compound transaction type */
+
+
 struct buffer_head;
 
 struct journal_head {
@@ -87,6 +89,12 @@ struct journal_head {
          * [j_list_lock]
          */
         struct journal_head *b_cpnext, *b_cpprev;
+
+        /* Trigger type */
+        struct jbd2_buffer_trigger_type *b_triggers;
+
+        /* Trigger type for the committing transaction's frozen data */
+        struct jbd2_buffer_trigger_type *b_frozen_triggers;
 };
 
 #endif          /* JOURNAL_HEAD_H_INCLUDED */