btrfs: stop running all delayed refs during snapshot

This was added in commit 361048f586f5 ("Btrfs: fix full backref problem
when inserting shared block reference") to address a problem where we
hit the following BUG_ON() in alloc_reserved_tree_block

        if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) {
                BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF));

However this BUG_ON() is bogus, and was removed by previous commit:

  btrfs: remove bogus BUG_ON in alloc_reserved_tree_block

We no longer need to run delayed refs because of this, and can remove
this flushing here.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index dbbd464..02592c6 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1749,12 +1749,6 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
                }
        }
 
-       ret = btrfs_run_delayed_refs(trans, (unsigned long)-1);
-       if (ret) {
-               btrfs_abort_transaction(trans, ret);
-               goto fail;
-       }
-
 fail:
        pending->error = ret;
 dir_item_existed: