Btrfs: remove last_log_alloc allocator optimization

The tree logging code was trying to separate tree log allocations
from normal metadata allocations to improve writeback patterns during
an fsync.

But, the code was not effective and ended up just mixing tree log
blocks with regular metadata.  That seems to be working fairly well,
so the last_log_alloc code can be removed.

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

1 files changed, 0 insertions, 1 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 11266d68a6c9..5ecc24d634a2 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -61,7 +61,6 @@ static noinline int join_transaction(struct btrfs_root *root)
                 root->fs_info->generation++;
                 root->fs_info->last_alloc = 0;
                 root->fs_info->last_data_alloc = 0;
-                root->fs_info->last_log_alloc = 0;
                 cur_trans->num_writers = 1;
                 cur_trans->num_joined = 0;
                 cur_trans->transid = root->fs_info->generation;