ext4: Make ext4_ext_find_extent fills ext_path completely

When pos=0 or depth, the fields of ext4_ext_path is are not
completely filled.  This patch also removes some unnecessary code.

Signed-off-by: Shen Feng <shen@cn.fujitsu.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index bc17ed7..3e966da 100644 (file)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -524,6 +524,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
                alloc = 1;
        }
        path[0].p_hdr = eh;
+       path[0].p_bh = NULL;
 
        i = depth;
        /* walk through the tree */
@@ -552,12 +553,14 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
        }
 
        path[ppos].p_depth = i;
-       path[ppos].p_hdr = eh;
        path[ppos].p_ext = NULL;
        path[ppos].p_idx = NULL;
 
        /* find extent */
        ext4_ext_binsearch(inode, path + ppos, block);
+       /* if not an empty leaf */
+       if (path[ppos].p_ext)
+               path[ppos].p_block = ext_pblock(path[ppos].p_ext);
 
        ext4_ext_show_path(inode, path);