From 2de8807b25de6d24476923121e3b20146fe8216b Mon Sep 17 00:00:00 2001
From: Amir Goldstein <amir73il@users.sf.net>
Date: Mon, 9 May 2011 21:48:13 -0400
Subject: [PATCH] ext4: synchronize ext4_mb_init_group() with buddy page lock

The old routines ext4_mb_[get|put]_buddy_cache_lock(), which used
to take grp->alloc_sem for all groups on the buddy page have been
replaced with the routines ext4_mb_[get|put]_buddy_page_lock().

The new routines take both buddy and bitmap page locks to protect
against concurrent init of groups on the same buddy page.

The GROUP_NEED_INIT flag is tested again under page lock to check
if the group was initialized by another caller.

Signed-off-by: Amir Goldstein <amir73il@users.sf.net>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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