Re: [PATCH fstests] btrfs: add test for large direct I/O reads w/ RAID

[Omar Sandoval <osandov@osandov.com>]

On Mon, Mar 02, 2020 at 02:08:45PM -0800, Omar Sandoval wrote:
> From: Omar Sandoval <osandov@fb.com>
> 
> Apparently we don't have any tests which exercise the code path in Btrfs
> that has to split up direct I/Os for RAID stripes. Add one to catch the
> bug fixed by "btrfs: fix RAID direct I/O reads with alternate csums".
> ---
> I also had to fix up the tests/btrfs/group file, which had a renumbering
> issue that was preventing me from adding a new test.
> 
>  tests/btrfs/207     | 58 +++++++++++++++++++++++++++++++++++++++++++++
>  tests/btrfs/207.out |  2 ++
>  tests/btrfs/group   |  3 ++-
>  3 files changed, 62 insertions(+), 1 deletion(-)
>  create mode 100755 tests/btrfs/207
>  create mode 100644 tests/btrfs/207.out
> 
> diff --git a/tests/btrfs/207 b/tests/btrfs/207
> new file mode 100755
> index 00000000..99e57cb8
> --- /dev/null
> +++ b/tests/btrfs/207
> @@ -0,0 +1,58 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2020 Facebook.  All Rights Reserved.
> +#
> +# FS QA Test 207
> +#
> +# Test large DIO reads with various profiles. Regression test for patch "btrfs:
> +# fix RAID direct I/O reads with alternate csums".

Hmm, I might as well make this test also exercise direct I/O writes, not
just reads. I'll send a v2.