From ac0b1bc1edbe81c0cb36cad7e7f5b91f4d9e12ed Mon Sep 17 00:00:00 2001
From: Benjamin LaHaise <bcrl@linux.intel.com>
Date: Fri, 9 Sep 2005 13:02:09 -0700
Subject: [PATCH] [PATCH] aio: kiocb locking to serialise retry and cancel

Implement a per-kiocb lock to serialise retry operations and cancel.  This
is done using wait_on_bit_lock() on the KIF_LOCKED bit of kiocb->ki_flags.
Also, make the cancellation path lock the kiocb and subsequently release
all references to it if the cancel was successful.  This version includes a
fix for the deadlock with __aio_run_iocbs.

Signed-off-by: Benjamin LaHaise <bcrl@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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