linux-ext4 - [PATCH v2] ext4: ext4_ext_convert_to_initialized bug found in extended FSX testing

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Date:	Fri, 13 May 2011 23:03:05 -0700
From:	Allison Henderson <achender@...ux.vnet.ibm.com>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Yongqiang Yang <xiaoqiangnk@...il.com>,
	Mingming Cao <cmm@...ibm.com>, Theodore Tso <tytso@....edu>
Subject: [PATCH v2] ext4: ext4_ext_convert_to_initialized bug found in extended
 FSX testing

Hi all,

After applying this patch, the fsx test has been able to run ok all 
day (about 12hrs). So I think it's safe to send it out now.  Thx all!

Allison Henderson

Signed-off-by: Allison Henderson <achender@...ibm.com>

---
:100644 100644 e363f21... 5f243da... M	fs/ext4/extents.c
 fs/ext4/extents.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e363f21..5f243da 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2818,8 +2818,8 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
 		    (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
 			/* case 3 */
 			zero_ex.ee_block =
-					 cpu_to_le32(map->m_lblk + map->m_len);
-			zero_ex.ee_len = cpu_to_le16(allocated - map->m_len);
+					 cpu_to_le32(map->m_lblk);
+			zero_ex.ee_len = cpu_to_le16(allocated);
 			ext4_ext_store_pblock(&zero_ex,
 				ext4_ext_pblock(ex) + map->m_lblk - ee_block);
 			err = ext4_ext_zeroout(inode, &zero_ex);
@@ -2842,10 +2842,9 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
 					goto out;
 			}
 
-			allocated = map->m_lblk - ee_block + map->m_len;
-
 			split_map.m_lblk = ee_block;
-			split_map.m_len = allocated;
+			split_map.m_len = map->m_lblk - ee_block + map->m_len;
+			allocated = map->m_len;
 		}
 	}
 
-- 
1.7.1

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