[PATCH] xfstests: btrfs, test send's ability to punch holes and prealloc extents

[Dave Chinner]

On Tue, Apr 15, 2014 at 05:43:21PM +0100, Filipe David Borba Manana wrote:
> This test verifies that after an incremental btrfs send the replicated file has
> the same exact hole and data structure as in the origin filesystem. This didn't
> use to be the case before the send stream version 2 - holes were sent as write
> operations of 0 valued bytes instead of punching holes with the fallocate system
> call, and pre-allocated extents were sent as well as write operations of 0 valued
> bytes instead of intructions for the receiver to use the fallocate system call.
> Also checks that prealloc extents that lie beyond the file's size are replicated
> by an incremental send.

Can you wrap commit messages at 68 columns?

....
> +md5sum $SCRATCH_MNT/mysnap2/foo | _filter_scratch
> +# List all hole and data segments.
> +$XFS_IO_PROG -r -c "seek -r -a 0" $SCRATCH_MNT/mysnap2/foo
> +# List all extents, we're interested here in prealloc extents that lie beyond
> +# the file's size.
> +$XFS_IO_PROG -r -c "fiemap -l" $SCRATCH_MNT/mysnap2/foo | _filter_scratch

That dumps raw block numbers into the golden output. _filter_fiemap
is probably needed here.

> +md5sum $SCRATCH_MNT/mysnap2/foo | _filter_scratch
> +# List all hole and data segments.
> +$XFS_IO_PROG -r -c "seek -r -a 0" $SCRATCH_MNT/mysnap2/foo
> +# List all extents, we're interested here in prealloc extents that lie beyond
> +# the file's size.
> +$XFS_IO_PROG -r -c "fiemap -l" $SCRATCH_MNT/mysnap2/foo | _filter_scratch

Same here.

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com