From 023ccde109b995bb99862bf9c87efd006b1d1885 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Tue, 29 Jan 2008 14:08:06 +0100
Subject: [PATCH] block: fix warning on compile with CONFIG_BLOCK

struct io_context was not defined, just add an empty forward decl.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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