[PATCH] xfs: test mkfs.xfs sizing of internal logs that

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

This is a regression test that exercises the mkfs.xfs code that creates
log sizes that are very close to the AG size when stripe units are in
play and/or when the log is forced to be in AG 0.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 tests/xfs/843     |   56 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/843.out |    2 ++
 2 files changed, 58 insertions(+)
 create mode 100755 tests/xfs/843
 create mode 100644 tests/xfs/843.out

diff --git a/tests/xfs/843 b/tests/xfs/843
new file mode 100755
index 00000000..3384b1aa
--- /dev/null
+++ b/tests/xfs/843
@@ -0,0 +1,56 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Oracle.  All Rights Reserved.
+#
+# FS QA Test 843
+#
+# Now that we've increased the default log size calculation, test mkfs with
+# various stripe units and filesystem sizes to see if we can provoke mkfs into
+# breaking.
+#
+. ./common/preamble
+_begin_fstest auto mkfs
+
+_cleanup()
+{
+	cd /
+	rm -r -f $tmp.* $testfile
+}
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs xfs
+_require_test
+
+testfile=$TEST_DIR/a
+rm -f $testfile
+
+test_format() {
+	local tag="$1"
+	shift
+
+	echo "$tag" >> $seqres.full
+	$MKFS_XFS_PROG $@ -d file,name=$testfile &>> $seqres.full
+	local res=$?
+	test $res -eq 0 || echo "$tag FAIL $res" | tee -a $seqres.full
+}
+
+# First we try various small filesystems and stripe sizes.
+for M in `seq 298 302` `seq 490 520`; do
+	for S in `seq 32 4 64`; do
+		test_format "M=$M S=$S" -dsu=${S}k,sw=1,size=${M}m
+	done
+done
+
+# log so large it pushes the root dir into AG 1
+test_format "log pushes rootdir into AG 1" -d agcount=3200,size=6366g -lagnum=0
+
+# log end rounded beyond EOAG due to stripe unit
+test_format "log end beyond eoag" -d agcount=3200,size=6366g -d su=256k,sw=4
+
+echo Silence is golden
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/843.out b/tests/xfs/843.out
new file mode 100644
index 00000000..87c13504
--- /dev/null
+++ b/tests/xfs/843.out
@@ -0,0 +1,2 @@
+QA output created by 843
+Silence is golden