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btrfs: Simplify alloc_reserved_tree_block interface
This function currently takes 7 parameters, most of which are proxies
for values from btrfs_delayed_ref_node struct which is not passed. This
patch simplifies the interface of the function by simply passing said
delayed ref node struct to the function. This enables us to:
1. Move locals variables and init code related to them from
run_delayed_tree_ref which should only be used inside
alloc_reserved_tree_block, such as skinny_metadata and the btrfs_key,
representing the extent being inserted. This removes the need for the
"ins" argument. Instead, it's replaced by a local var with a more
verbose name - extent_key.
2. Now that we have a reference to the node in alloc_reserved_tree_block
the delayed_tree_ref struct can be referenced inside the function and
this enable removing the "ref->level", "parent" and "ref_root"
arguments.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>