when ext4_ext_insert_extent() fails to insert new blocks
we should free just allocated blocks. please, consider
for review.

Signed-off-by: Alex Tomas <alex@clusterfs.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>

Index: linux-2.6.22-rc1/fs/ext4/extents.c
===================================================================
--- linux-2.6.22-rc1.orig/fs/ext4/extents.c	2007-05-18 16:32:27.000000000 -0700
+++ linux-2.6.22-rc1/fs/ext4/extents.c	2007-05-18 16:32:32.000000000 -0700
@@ -2067,8 +2067,12 @@
 	ext4_ext_store_pblock(&newex, newblock);
 	newex.ee_len = cpu_to_le16(allocated);
 	err = ext4_ext_insert_extent(handle, inode, path, &newex);
-	if (err)
+	if (err) {
+		/* free data blocks we just allocated */
+		ext4_free_blocks(handle, inode, ext_pblock(&newex),
+					le16_to_cpu(newex.ee_len));
 		goto out2;
+	}
 
 	if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
 		EXT4_I(inode)->i_disksize = inode->i_size;