linux-ext4 - [PATCH v2] ext4: fix wrong size computation in ext4_mb_normalize

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Message-ID: <1405067660-728-1-git-send-email-wangxg.fnst@cn.fujitsu.com>
Date:	Fri, 11 Jul 2014 16:34:20 +0800
From:	Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
To:	<linux-ext4@...r.kernel.org>
CC:	<tytso@....edu>, <lczerner@...hat.com>,
	Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
Subject: [PATCH v2] ext4: fix wrong size computation in ext4_mb_normalize_request()

As the member fe_len defined in struct ext4_free_extent is expressed as
number of clusters, the variable "size" computation is wrong, we need to
first translate fe_len to block number, then to bytes.

Signed-off-by: Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
---
 fs/ext4/mballoc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 7f72f50..975a35e 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3076,7 +3076,8 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
 		size = 8 * 1024 * 1024;
 	} else {
 		start_off = (loff_t)ac->ac_o_ex.fe_logical << bsbits;
-		size	  = ac->ac_o_ex.fe_len << bsbits;
+		size	  = (loff_t)EXT4_C2B(EXT4_SB(ac->ac_sb),
+				     ac->ac_o_ex.fe_len) << bsbits;
 	}
 	size = size >> bsbits;
 	start = start_off >> bsbits;
-- 
1.8.2.1

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