[lustre-devel] [PATCH 17/22] ext4: optimize ext4_journal_callback_add

[James Simmons]

Change list_add_tail to list_add. It gives advantages to ldiskfs
in tgt_cb_last_committed. In the beginning of list will be placed
thandles with the highest transaction numbers. So at the first
iterations we will have the highest transno. It will save from
extra call of ptlrpc_commit_replies.

Signed-off-by: James Simmons <jsimmons at infradead.org>
---
 fs/ext4/ext4_jbd2.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index 75a5309..5ebf8ee 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -169,7 +169,7 @@ static inline void _ext4_journal_callback_add(handle_t *handle,
 			struct ext4_journal_cb_entry *jce)
 {
 	/* Add the jce to transaction's private list */
-	list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
+	list_add(&jce->jce_list, &handle->h_transaction->t_private_list);
 }
 
 static inline void ext4_journal_callback_add(handle_t *handle,
-- 
1.8.3.1