Btrfs: don't wait around for new log writers on an SSD

Waiting on spindles improves performance, but ssds want all the
IO as quickly as we can push it down.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index b72b068..8c35847 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1330,7 +1330,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
                spin_unlock(&root->fs_info->trans_lock);
        }
 
-       if (now < cur_trans->start_time || now - cur_trans->start_time < 1)
+       if (!btrfs_test_opt(root, SSD) &&
+           (now < cur_trans->start_time || now - cur_trans->start_time < 1))
                should_grow = 1;
 
        do {