linux-ext4 - [PATCH] ext4:fix invariant checking in ext4_rebalance

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Message-ID: <20070616080200.GA14349@localhost.sw.ru>
Date:	Sat, 16 Jun 2007 12:02:00 +0400
From:	Dmitriy Monakhov <dmonakhov@...ru>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Alex Tomas <alex@...sterfs.com>, linux-ext4@...r.kernel.org
Subject: [PATCH] ext4:fix invariant checking in ext4_rebalance_reservation

Variable "free" was declarated as __u64 so conidition (free < 0) always
false, even if free was overflowed during substraction.
---
 fs/ext4/balloc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 43ae8f8..a9655f1 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -1909,8 +1909,8 @@ void ext4_rebalance_reservation(struct ext4_reservation_slot *rs, __u64 free)
 			chunk = free;
 		if (rs[i].rs_reserved || i == smp_processor_id()) {
 			rs[i].rs_reserved = chunk;
+			BUG_ON(free < chunk);
 			free -= chunk;
-			BUG_ON(free < 0);
 		}
 	}
 	BUG_ON(free);
-- 
1.5.2

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