From 2c1953e201a05ddfb1ea53f23d81a492c6513028 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kmo@daterainc.com>
Date: Wed, 24 Jul 2013 17:41:08 -0700
Subject: [PATCH] bcache: Convert bch_btree_read_async() to
 bch_btree_map_keys()

This is a fairly straightforward conversion, mostly reshuffling -
op->lookup_done goes away, replaced by MAP_DONE/MAP_CONTINUE. And the
code for handling cache hits and misses wasn't really btree code, so it
gets moved to request.c.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
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