ext4: Replace hackish ext4_mb_poll_new_transaction with commit callback
The multiblock allocator needs to be able to release blocks (and issue
a blkdev discard request) when the transaction which freed those
blocks is committed. Previously this was done via a polling mechanism
when blocks are allocated or freed. A much better way of doing things
is to create a jbd2 callback function and attaching the list of blocks
to be freed directly to the transaction structure.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 463d6f1..c7d106e 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -641,6 +641,11 @@
*/
int t_handle_count;
+ /*
+ * For use by the filesystem to store fs-specific data
+ * structures associated with the transaction
+ */
+ struct list_head t_private_list;
};
struct transaction_run_stats_s {
@@ -935,6 +940,10 @@
pid_t j_last_sync_writer;
+ /* This function is called when a transaction is closed */
+ void (*j_commit_callback)(journal_t *,
+ transaction_t *);
+
/*
* Journal statistics
*/