Thanks, this has been a very helpful thread. How do I determine and control whether a file is extent-based? -Bradley On Tue, Jan 22, 2013 at 11:20 AM, Zheng Liu <gnehzuil.liu@xxxxxxxxx> wrote: > Ext4 file system supports hole punching. But until now only extent-based > file supports it. As far as I know, redhat distributions don't support > hole punching. You can find a sample program from e2fsprogs which is in > $e2fsprogs/conrib/fallocate.c. The latest fallocate(1) in util-linux > also can be as a demo. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html