use-iomap-for-zeroing-blocks-in-DAX-mode

   1 ext4: use iomap for zeroing blocks in DAX mode
   2
   3 From: Jan Kara <jack@suse.cz>
   4
   5 Use iomap infrastructure for zeroing blocks when in DAX mode.
   6 ext4_iomap_begin() handles read requests just fine and that's all that
   7 is needed for iomap_zero_range().
   8
   9 Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
  10 Signed-off-by: Jan Kara <jack@suse.cz>
  11 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
  12 ---
  13  fs/ext4/inode.c | 6 ++++--
  14  1 file changed, 4 insertions(+), 2 deletions(-)
  15
  16 diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
  17 index 83e8411370d3..df017ce3e52d 100644
  18 --- a/fs/ext4/inode.c
  19 +++ b/fs/ext4/inode.c
  20 @@ -3849,8 +3849,10 @@ static int ext4_block_zero_page_range(handle_t *handle,
  21         if (length > max || length < 0)
  22                 length = max;
  23
  24 -       if (IS_DAX(inode))
  25 -               return dax_zero_page_range(inode, from, length, ext4_get_block);
  26 +       if (IS_DAX(inode)) {
  27 +               return iomap_zero_range(inode, from, length, NULL,
  28 +                                       &ext4_iomap_ops);
  29 +       }
  30         return __ext4_block_zero_page_range(handle, mapping, from, length);
  31  }
  32
  33 --
  34 2.6.6
  35
  36