ext4-make-ext4_ext_find_extent-fills-ext_path-completely.patch

   1 ext4: Make ext4_ext_find_extent fills ext_path completely
   2
   3 From: Shen Feng <shen@cn.fujitsu.com>
   4
   5 When pos=0 or depth, the fields of ext4_ext_path is are not
   6 completely filled.  This patch also removes some unnecessary code.
   7
   8 Signed-off-by: Shen Feng <shen@cn.fujitsu.com>
   9 Signed-off-by: Mingming Cao <cmm@us.ibm.com>
  10 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
  11 ---
  12  fs/ext4/extents.c |    5 ++++-
  13  1 file changed, 4 insertions(+), 1 deletion(-)
  14
  15 Index: linux-2.6.26-rc6/fs/ext4/extents.c
  16 ===================================================================
  17 --- linux-2.6.26-rc6.orig/fs/ext4/extents.c     2008-06-17 10:43:29.000000000 -0700
  18 +++ linux-2.6.26-rc6/fs/ext4/extents.c  2008-06-17 10:43:29.000000000 -0700
  19 @@ -524,6 +524,7 @@ ext4_ext_find_extent(struct inode *inode
  20                 alloc = 1;
  21         }
  22         path[0].p_hdr = eh;
  23 +       path[0].p_bh = NULL;
  24
  25         i = depth;
  26         /* walk through the tree */
  27 @@ -552,12 +553,14 @@ ext4_ext_find_extent(struct inode *inode
  28         }
  29
  30         path[ppos].p_depth = i;
  31 -       path[ppos].p_hdr = eh;
  32         path[ppos].p_ext = NULL;
  33         path[ppos].p_idx = NULL;
  34
  35         /* find extent */
  36         ext4_ext_binsearch(inode, path + ppos, block);
  37 +       /* if not an empty leaf */
  38 +       if (path[ppos].p_ext)
  39 +               path[ppos].p_block = ext_pblock(path[ppos].p_ext);
  40
  41         ext4_ext_show_path(inode, path);
  42