Btrfs: check the root passed to btrfs_end_transaction

This patch only add a consistancy check to validate that the
same root is passed to start_transaction and end_transaction.
Subvolume quota depends on this.

Signed-off-by: Arne Jansen <sensille@gmx.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index fe27379e368b..010729446e13 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -57,6 +57,12 @@ struct btrfs_trans_handle {
         struct btrfs_block_rsv *block_rsv;
         struct btrfs_block_rsv *orig_rsv;
         int aborted;
+        /*
+         * this root is only needed to validate that the root passed to
+         * start_transaction is the same as the one passed to end_transaction.
+         * Subvolume quota depends on this
+         */
+        struct btrfs_root *root;
 };
 
 struct btrfs_pending_snapshot {