[Btrfs-devel][PATCH]Fix extent_map leak in extent_bmap

[Yan Zheng]

A obvious leak,  I think no description is needed.

Regards
YZ
---
diff -r a1bde8e797ff extent_map.c
--- a/extent_map.c	Thu Oct 25 15:49:25 2007 -0400
+++ b/extent_map.c	Sun Oct 28 21:36:03 2007 +0800
@@ -1925,6 +1925,7 @@ sector_t extent_bmap(struct address_spac
 	u64 start = iblock << inode->i_blkbits;
 	u64 end = start + (1 << inode->i_blkbits) - 1;
 	struct extent_map *em;
+	sector_t sector = 0;

 	em = get_extent(inode, NULL, 0, start, end, 0);
 	if (!em || IS_ERR(em))
@@ -1932,9 +1933,12 @@ sector_t extent_bmap(struct address_spac

 	if (em->block_start == EXTENT_MAP_INLINE ||
 	    em->block_start == EXTENT_MAP_HOLE)
-		return 0;
-
-	return (em->block_start + start - em->start) >> inode->i_blkbits;
+		goto out;
+
+	sector = (em->block_start + start - em->start) >> inode->i_blkbits;
+out:
+	free_extent_map(em);
+	return sector;
 }

 static int add_lru(struct extent_map_tree *tree, struct extent_buffer *eb)