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Date:	Mon,  3 Nov 2008 23:06:09 +0530
From:	"Aneesh Kumar K.V" <>
	"Aneesh Kumar K.V" <>
Subject: [RFC PATCH -v2 9/9] ext4: Fix lockdep recursive locking warning

Indicate that the group locks can be taken in loop.

Signed-off-by: Aneesh Kumar K.V <>
 fs/ext4/mballoc.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index c169256..5a5f9e1 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2418,6 +2418,7 @@ ext4_mb_store_history(struct ext4_allocation_context *ac)
 #define ext4_mb_history_init(sb)
+static struct lock_class_key alloc_sem_key[NR_BG_LOCKS];
 /* Create and initialize ext4_group_info data for the given group. */
 int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
@@ -2478,7 +2479,9 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
-	init_rwsem(&meta_group_info[i]->alloc_sem);
+	__init_rwsem(&meta_group_info[i]->alloc_sem,
+			"&meta_group_info[i]->alloc_sem",
+			&alloc_sem_key[i]);
 	meta_group_info[i]->bb_free_root.rb_node = NULL;;

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