diff --git a/lib/ecto/adapter/migration.ex b/lib/ecto/adapter/migration.ex
index e7870c58..f1c0a712 100644
--- a/lib/ecto/adapter/migration.ex
+++ b/lib/ecto/adapter/migration.ex
@@ -32,9 +32,12 @@ defmodule Ecto.Adapter.Migration do
   @typedoc "All commands allowed within the block passed to `table/2`"
   @type table_subcommand ::
           {:add, field :: atom, type :: Ecto.Type.t() | Reference.t() | binary(), Keyword.t()}
-          | {:add_if_not_exists, field :: atom, type :: Ecto.Type.t() | Reference.t() | binary(), Keyword.t()}
-          | {:modify, field :: atom, type :: Ecto.Type.t() | Reference.t() | binary(), Keyword.t()}
-          | {:remove, field :: atom, type :: Ecto.Type.t() | Reference.t() | binary(), Keyword.t()}
+          | {:add_if_not_exists, field :: atom, type :: Ecto.Type.t() | Reference.t() | binary(),
+             Keyword.t()}
+          | {:modify, field :: atom, type :: Ecto.Type.t() | Reference.t() | binary(),
+             Keyword.t()}
+          | {:remove, field :: atom, type :: Ecto.Type.t() | Reference.t() | binary(),
+             Keyword.t()}
           | {:remove, field :: atom}
           | {:remove_if_exists, type :: Ecto.Type.t() | Reference.t() | binary()}
 
@@ -55,7 +58,7 @@ defmodule Ecto.Adapter.Migration do
   Executes migration commands.
   """
   @callback execute_ddl(adapter_meta, command, options :: Keyword.t()) ::
-              {:ok, [{Logger.level, Logger.message, Logger.metadata}]}
+              {:ok, [{Logger.level(), Logger.message(), Logger.metadata()}]}
 
   @doc """
   Locks the migrations table and emits the locked versions for callback execution.
diff --git a/lib/ecto/adapter/structure.ex b/lib/ecto/adapter/structure.ex
index 4c172f5c..1cbf6cc0 100644
--- a/lib/ecto/adapter/structure.ex
+++ b/lib/ecto/adapter/structure.ex
@@ -18,8 +18,8 @@ defmodule Ecto.Adapter.Structure do
                                   hostname: "localhost")
 
   """
-  @callback structure_dump(default :: String.t, config :: Keyword.t) ::
-            {:ok, String.t} | {:error, term}
+  @callback structure_dump(default :: String.t(), config :: Keyword.t()) ::
+              {:ok, String.t()} | {:error, term}
 
   @doc """
   Loads the given structure.
@@ -36,8 +36,8 @@ defmodule Ecto.Adapter.Structure do
                                   hostname: "localhost")
 
   """
-  @callback structure_load(default :: String.t, config :: Keyword.t) ::
-            {:ok, String.t} | {:error, term}
+  @callback structure_load(default :: String.t(), config :: Keyword.t()) ::
+              {:ok, String.t()} | {:error, term}
 
   @doc """
   Runs the dump command for the given repo / config.
diff --git a/lib/ecto/migration/runner.ex b/lib/ecto/migration/runner.ex
index 904546e6..25092ba0 100644
--- a/lib/ecto/migration/runner.ex
+++ b/lib/ecto/migration/runner.ex
@@ -16,12 +16,12 @@ defmodule Ecto.Migration.Runner do
     level = Keyword.get(opts, :log, :info)
     sql = Keyword.get(opts, :log_migrations_sql, false)
     log = %{level: level, sql: sql}
-    args  = {self(), repo, config, module, direction, migrator_direction, log}
+    args = {self(), repo, config, module, direction, migrator_direction, log}
 
     {:ok, runner} = DynamicSupervisor.start_child(Ecto.MigratorSupervisor, {__MODULE__, args})
     metadata(runner, opts)
 
-    log(level, "== Running #{version} #{inspect module}.#{operation}/0 #{direction}")
+    log(level, "== Running #{version} #{inspect(module)}.#{operation}/0 #{direction}")
     {time, _} = :timer.tc(fn -> perform_operation(repo, module, operation) end)
     log(level, "== Migrated #{version} in #{inspect(div(time, 100_000) / 10)}s")
 
@@ -97,7 +97,7 @@ defmodule Ecto.Migration.Runner do
   def prefix do
     case Process.get(:ecto_migration) do
       %{prefix: prefix} -> prefix
-      _ -> raise "could not find migration runner process for #{inspect self()}"
+      _ -> raise "could not find migration runner process for #{inspect(self())}"
     end
   end
 
@@ -128,7 +128,8 @@ defmodule Ecto.Migration.Runner do
     reply =
       Agent.get_and_update(runner(), fn
         %{command: nil} = state ->
-          {:ok, %{state | subcommands: [], commands: [command|state.commands]}}
+          {:ok, %{state | subcommands: [], commands: [command | state.commands]}}
+
         %{command: _} = state ->
           {:error, %{state | command: nil}}
       end)
@@ -136,6 +137,7 @@ defmodule Ecto.Migration.Runner do
     case reply do
       :ok ->
         :ok
+
       :error ->
         raise Ecto.MigrationError, "cannot execute nested commands"
     end
@@ -149,6 +151,7 @@ defmodule Ecto.Migration.Runner do
       Agent.get_and_update(runner(), fn
         %{command: nil} = state ->
           {:ok, %{state | command: command}}
+
         %{command: _} = state ->
           {:error, %{state | command: command}}
       end)
@@ -156,6 +159,7 @@ defmodule Ecto.Migration.Runner do
     case reply do
       :ok ->
         :ok
+
       :error ->
         raise Ecto.MigrationError, "cannot execute nested commands"
     end
@@ -165,11 +169,11 @@ defmodule Ecto.Migration.Runner do
   Queues and clears current command. Must call `start_command/1` first.
   """
   def end_command do
-    Agent.update runner(), fn state ->
+    Agent.update(runner(), fn state ->
       {operation, object} = state.command
       command = {operation, object, Enum.reverse(state.subcommands)}
-      %{state | command: nil, subcommands: [], commands: [command|state.commands]}
-    end
+      %{state | command: nil, subcommands: [], commands: [command | state.commands]}
+    end)
   end
 
   @doc """
@@ -180,13 +184,15 @@ defmodule Ecto.Migration.Runner do
       Agent.get_and_update(runner(), fn
         %{command: nil} = state ->
           {:error, state}
+
         state ->
-          {:ok, update_in(state.subcommands, &[subcommand|&1])}
+          {:ok, update_in(state.subcommands, &[subcommand | &1])}
       end)
 
     case reply do
       :ok ->
         :ok
+
       :error ->
         raise Ecto.MigrationError, message: "cannot execute command outside of block"
     end
@@ -210,31 +216,41 @@ defmodule Ecto.Migration.Runner do
     if reversed = reverse(command) do
       log_and_execute_ddl(repo, migration, log, reversed)
     else
-      raise Ecto.MigrationError, message:
-        "cannot reverse migration command: #{command command}. " <>
-        "You will need to explicitly define up/0 and down/0 in your migration"
+      raise Ecto.MigrationError,
+        message:
+          "cannot reverse migration command: #{command(command)}. " <>
+            "You will need to explicitly define up/0 and down/0 in your migration"
     end
   end
 
   defp reverse({:create, %Index{} = index}),
     do: {:drop, index, :restrict}
+
   defp reverse({:create_if_not_exists, %Index{} = index}),
     do: {:drop_if_exists, index, :restrict}
+
   defp reverse({:drop, %Index{} = index, _}),
     do: {:create, index}
+
   defp reverse({:drop_if_exists, %Index{} = index, _}),
     do: {:create_if_not_exists, index}
+
   defp reverse({:rename, %Index{} = index, new_name}),
     do: {:rename, %{index | name: new_name}, index.name}
+
   defp reverse({:create, %Table{} = table, _columns}),
     do: {:drop, table, :restrict}
+
   defp reverse({:create_if_not_exists, %Table{} = table, _columns}),
     do: {:drop_if_exists, table, :restrict}
+
   defp reverse({:rename, %Table{} = table_current, %Table{} = table_new}),
     do: {:rename, table_new, table_current}
+
   defp reverse({:rename, %Table{} = table, current_column, new_column}),
     do: {:rename, table, new_column, current_column}
-  defp reverse({:alter,  %Table{} = table, changes}) do
+
+  defp reverse({:alter, %Table{} = table, changes}) do
     if reversed = table_reverse(changes, []) do
       {:alter, table, reversed}
     end
@@ -244,14 +260,16 @@ defmodule Ecto.Migration.Runner do
   # we can't guarantee data integrity when applying them back.
   defp reverse({:create_if_not_exists, %Constraint{} = constraint}),
     do: {:drop_if_exists, constraint, :restrict}
+
   defp reverse({:create, %Constraint{} = constraint}),
     do: {:drop, constraint, :restrict}
 
   defp reverse(_command), do: false
 
-  defp table_reverse([{:remove, name, type, opts}| t], acc) do
+  defp table_reverse([{:remove, name, type, opts} | t], acc) do
     table_reverse(t, [{:add, name, type, opts} | acc])
   end
+
   defp table_reverse([{:modify, name, type, opts} | t], acc) do
     case opts[:from] do
       nil ->
@@ -267,12 +285,15 @@ defmodule Ecto.Migration.Runner do
         table_reverse(t, [{:modify, name, reverse_type, reverse_opts} | acc])
     end
   end
+
   defp table_reverse([{:add, name, type, _opts} | t], acc) do
     table_reverse(t, [{:remove, name, type, []} | acc])
   end
+
   defp table_reverse([_ | _], _acc) do
     false
   end
+
   defp table_reverse([], acc) do
     acc
   end
@@ -302,7 +323,7 @@ defmodule Ecto.Migration.Runner do
   defp runner do
     case Process.get(:ecto_migration) do
       %{runner: runner} -> runner
-      _ -> raise "could not find migration runner process for #{inspect self()}"
+      _ -> raise "could not find migration runner process for #{inspect(self())}"
     end
   end
 
@@ -339,22 +360,26 @@ defmodule Ecto.Migration.Runner do
   defp log(level, msg, metadata \\ [])
   defp log(false, _msg, _metadata), do: :ok
   defp log(true, msg, metadata), do: Logger.log(:info, msg, metadata)
-  defp log(level, msg, metadata),  do: Logger.log(level, msg, metadata)
+  defp log(level, msg, metadata), do: Logger.log(level, msg, metadata)
 
   defp maybe_warn_index_ddl_transaction(%{concurrently: true} = index, migration) do
     migration_config = migration.__migration__()
 
     if not migration_config[:disable_ddl_transaction] do
-      IO.warn """
-      Migration #{inspect(migration)} has set index `#{index.name}` on table \
-      `#{index.table}` to concurrently but did not disable ddl transaction. \
-      Please set:
-
-          use Ecto.Migration
-          @disable_ddl_transaction true
-      """, []
+      IO.warn(
+        """
+        Migration #{inspect(migration)} has set index `#{index.name}` on table \
+        `#{index.table}` to concurrently but did not disable ddl transaction. \
+        Please set:
+
+            use Ecto.Migration
+            @disable_ddl_transaction true
+        """,
+        []
+      )
     end
   end
+
   defp maybe_warn_index_ddl_transaction(_index, _migration), do: :ok
 
   defp maybe_warn_index_migration_lock(%{concurrently: true} = index, repo, migration) do
@@ -367,77 +392,106 @@ defmodule Ecto.Migration.Runner do
         :ok
 
       {false, Ecto.Adapters.Postgres, _} ->
-        IO.warn """
-        Migration #{inspect(migration)} has set index `#{index.name}` on table \
-        `#{index.table}` to concurrently but did not disable migration lock. \
-        Please set:
+        IO.warn(
+          """
+          Migration #{inspect(migration)} has set index `#{index.name}` on table \
+          `#{index.table}` to concurrently but did not disable migration lock. \
+          Please set:
 
-            use Ecto.Migration
-            @disable_migration_lock true
+              use Ecto.Migration
+              @disable_migration_lock true
 
-        Alternatively, consider using advisory locks during migrations in the \
-        repo configuration:
+          Alternatively, consider using advisory locks during migrations in the \
+          repo configuration:
 
-            config #{inspect(repo)}, migration_lock: :pg_advisory_lock
-        """, []
+              config #{inspect(repo)}, migration_lock: :pg_advisory_lock
+          """,
+          []
+        )
 
       {false, _adapter, _migration_lock} ->
-        IO.warn """
-        Migration #{inspect(migration)} has set index `#{index.name}` on table \
-        `#{index.table}` to concurrently but did not disable migration lock. \
-        Please set:
-
-            use Ecto.Migration
-            @disable_migration_lock true
-        """, []
+        IO.warn(
+          """
+          Migration #{inspect(migration)} has set index `#{index.name}` on table \
+          `#{index.table}` to concurrently but did not disable migration lock. \
+          Please set:
+
+              use Ecto.Migration
+              @disable_migration_lock true
+          """,
+          []
+        )
 
       _ ->
         :ok
     end
   end
+
   defp maybe_warn_index_migration_lock(_index, _repo, _migration), do: :ok
 
   defp command(ddl) when is_binary(ddl) or is_list(ddl),
-    do: "execute #{inspect ddl}"
+    do: "execute #{inspect(ddl)}"
 
   defp command({:create, %Table{} = table, _}),
     do: "create table #{quote_name(table.prefix, table.name)}"
+
   defp command({:create_if_not_exists, %Table{} = table, _}),
     do: "create table if not exists #{quote_name(table.prefix, table.name)}"
+
   defp command({:alter, %Table{} = table, _}),
     do: "alter table #{quote_name(table.prefix, table.name)}"
+
   defp command({:drop, %Table{} = table, mode}),
     do: "drop table #{quote_name(table.prefix, table.name)}#{drop_mode(mode)}"
+
   defp command({:drop_if_exists, %Table{} = table, mode}),
     do: "drop table if exists #{quote_name(table.prefix, table.name)}#{drop_mode(mode)}"
 
   defp command({:create, %Index{} = index}),
     do: "create index #{quote_name(index.prefix, index.name)}"
+
   defp command({:create_if_not_exists, %Index{} = index}),
     do: "create index if not exists #{quote_name(index.prefix, index.name)}"
+
   defp command({:drop, %Index{} = index, mode}),
     do: "drop index #{quote_name(index.prefix, index.name)}#{drop_mode(mode)}"
+
   defp command({:drop_if_exists, %Index{} = index, mode}),
     do: "drop index if exists #{quote_name(index.prefix, index.name)}#{drop_mode(mode)}"
+
   defp command({:rename, %Index{} = index_current, new_name}),
     do: "rename index #{quote_name(index_current.name)} to #{new_name}"
+
   defp command({:rename, %Table{} = current_table, %Table{} = new_table}),
-    do: "rename table #{quote_name(current_table.prefix, current_table.name)} to #{quote_name(new_table.prefix, new_table.name)}"
+    do:
+      "rename table #{quote_name(current_table.prefix, current_table.name)} to #{quote_name(new_table.prefix, new_table.name)}"
+
   defp command({:rename, %Table{} = table, current_column, new_column}),
-    do: "rename column #{current_column} to #{new_column} on table #{quote_name(table.prefix, table.name)}"
+    do:
+      "rename column #{current_column} to #{new_column} on table #{quote_name(table.prefix, table.name)}"
 
   defp command({:create, %Constraint{check: nil, exclude: nil}}),
     do: raise(ArgumentError, "a constraint must have either a check or exclude option")
-  defp command({:create, %Constraint{check: check, exclude: exclude}}) when is_binary(check) and is_binary(exclude),
-    do: raise(ArgumentError, "a constraint must not have both check and exclude options")
+
+  defp command({:create, %Constraint{check: check, exclude: exclude}})
+       when is_binary(check) and is_binary(exclude),
+       do: raise(ArgumentError, "a constraint must not have both check and exclude options")
+
   defp command({:create, %Constraint{check: check} = constraint}) when is_binary(check),
-    do: "create check constraint #{constraint.name} on table #{quote_name(constraint.prefix, constraint.table)}"
+    do:
+      "create check constraint #{constraint.name} on table #{quote_name(constraint.prefix, constraint.table)}"
+
   defp command({:create, %Constraint{exclude: exclude} = constraint}) when is_binary(exclude),
-    do: "create exclude constraint #{constraint.name} on table #{quote_name(constraint.prefix, constraint.table)}"
+    do:
+      "create exclude constraint #{constraint.name} on table #{quote_name(constraint.prefix, constraint.table)}"
+
   defp command({:drop, %Constraint{} = constraint, _}),
-    do: "drop constraint #{constraint.name} from table #{quote_name(constraint.prefix, constraint.table)}"
+    do:
+      "drop constraint #{constraint.name} from table #{quote_name(constraint.prefix, constraint.table)}"
+
   defp command({:drop_if_exists, %Constraint{} = constraint, _}),
-    do: "drop constraint if exists #{constraint.name} from table #{quote_name(constraint.prefix, constraint.table)}"
+    do:
+      "drop constraint if exists #{constraint.name} from table #{quote_name(constraint.prefix, constraint.table)}"
 
   defp drop_mode(:restrict), do: ""
   defp drop_mode(:cascade), do: " cascade"
diff --git a/lib/ecto/migration/schema_migration.ex b/lib/ecto/migration/schema_migration.ex
index ab9a85e2..1ebc3d4a 100644
--- a/lib/ecto/migration/schema_migration.ex
+++ b/lib/ecto/migration/schema_migration.ex
@@ -72,7 +72,8 @@ defmodule Ecto.Migration.SchemaMigration do
   defp default_opts(opts) do
     Keyword.merge(
       @default_opts,
-      [prefix: opts[:prefix], log: Keyword.get(opts, :log_migrator_sql, false)]
+      prefix: opts[:prefix],
+      log: Keyword.get(opts, :log_migrator_sql, false)
     )
   end
 end