btrfs: add a test case to verify the write behavior of large RAID5 data chunks

btrfs: add a test case to verify the write behavior of large RAID5 data chunks

There is a recent regression during v6.4 merge window, that a u32 left
shift overflow can cause problems with large data chunks (over 4G)
sized.

This is especially nasty for RAID56, which can lead to ASSERT() during
regular writes, or corrupt memory if CONFIG_BTRFS_ASSERT is not enabled.

This is the regression test case for it.

Unlike btrfs/292, btrfs doesn't support trim inside RAID56 chunks, thus
the workflow is simplified:

- Create a RAID5 or RAID6 data chunk during mkfs

- Fill the fs with 5G data and sync
  For unpatched kernel, the sync would crash the kernel.

- Make sure everything is fine

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>