[PATCH 1/2] xfs/558: scale blk IO size based on the filesystem blksz

["Pankaj Raghav (Samsung)" <kernel@pankajraghav.com>]

From: Pankaj Raghav <p.raghav@samsung.com>

This test fails for >= 64k filesystem block size on a 4k PAGE_SIZE
system(see LBS efforts[1]). Scale the `blksz` based on the filesystem
block size instead of fixing it as 64k so that we do get some iomap
invalidations while doing concurrent writes.

Cap the blksz to be at least 64k to retain the same behaviour as before
for smaller filesystem blocksizes.

[1] LBS effort: https://lore.kernel.org/lkml/20230915183848.1018717-1-kernel@pankajraghav.com/

Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
 tests/xfs/558 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/xfs/558 b/tests/xfs/558
index 9e9b3be8..270f458c 100755
--- a/tests/xfs/558
+++ b/tests/xfs/558
@@ -127,7 +127,12 @@ _scratch_mount >> $seqres.full
 $XFS_IO_PROG -c 'chattr -x' $SCRATCH_MNT &> $seqres.full
 _require_pagecache_access $SCRATCH_MNT
 
-blksz=65536
+min_blksz=65536
+file_blksz=$(_get_file_block_size "$SCRATCH_MNT")
+blksz=$(( 8 * $file_blksz ))
+
+blksz=$(( blksz > min_blksz ? blksz : min_blksz ))
+
 _require_congruent_file_oplen $SCRATCH_MNT $blksz
 
 # Make sure we have sufficient extent size to create speculative CoW
-- 
2.43.0