minor, typos in comments s/substract/subtract/

On Wed, Aug 24, 2011 at 02:13:16PM +0800, Li Zefan wrote:
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 660a6c8..3351b1b 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -2331,14 +2331,21 @@ static noinline long btrfs_ioctl_clone(struct file 
> *file, unsigned long srcfd,
>  
>                       if (type == BTRFS_FILE_EXTENT_REG ||
>                           type == BTRFS_FILE_EXTENT_PREALLOC) {
> +                             /*
> +                              *    a  | --- range to clone ---|  b
> +                              * | ------------- extent ------------- |
> +                              */
> +
> +                             /* substract range b */
...

> +                             if (key.offset + datal > off + len)
> +                                     datal = off + len - key.offset;
> +
> +                             /* substract range a */
...

>                               if (off > key.offset) {
>                                       datao += off - key.offset;
>                                       datal -= off - key.offset;
>                               }
>  
> -                             if (key.offset + datal > off + len)
> -                                     datal = off + len - key.offset;
> -
>                               ret = btrfs_drop_extents(trans, inode,
>                                                        new_key.offset,
>                                                        new_key.offset + datal,
--
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