The only thing the passed root is used for is:
1. get a reference to the fs_info and to
2. call trace_btrfs_transaction_commit.

We can achieve 1) by simply referring to the fs_info from passed trans
object. As far as 2) is concerned cleanup_transaction is called from
only one place and the 'root' argument passed is the one from the trans
handle. No functional changes.

Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---
 fs/btrfs/transaction.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 354143e6d440..b8fd9fe8a9c1 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1866,10 +1866,9 @@ int btrfs_commit_transaction_async(struct 
btrfs_trans_handle *trans,
 }
 
 
-static void cleanup_transaction(struct btrfs_trans_handle *trans,
-                               struct btrfs_root *root, int err)
+static void cleanup_transaction(struct btrfs_trans_handle *trans, int err)
 {
-       struct btrfs_fs_info *fs_info = root->fs_info;
+       struct btrfs_fs_info *fs_info = trans->fs_info;
        struct btrfs_transaction *cur_trans = trans->transaction;
        DEFINE_WAIT(wait);
 
@@ -1909,7 +1908,7 @@ static void cleanup_transaction(struct btrfs_trans_handle 
*trans,
        btrfs_put_transaction(cur_trans);
        btrfs_put_transaction(cur_trans);
 
-       trace_btrfs_transaction_commit(root);
+       trace_btrfs_transaction_commit(trans->root);
 
        if (current->journal_info == trans)
                current->journal_info = NULL;
@@ -2330,7 +2329,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle 
*trans)
        btrfs_warn(fs_info, "Skipping commit of aborted transaction.");
        if (current->journal_info == trans)
                current->journal_info = NULL;
-       cleanup_transaction(trans, trans->root, ret);
+       cleanup_transaction(trans, ret);
 
        return ret;
 }
-- 
2.7.4

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