[PATCH 1/4] xfs: test health monitoring code

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

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

Add some functionality tests for the new health monitoring code.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
 doc/group-names.txt |    1 +
 tests/xfs/1885      |   53 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/1885.out  |    5 +++++
 3 files changed, 59 insertions(+)
 create mode 100755 tests/xfs/1885
 create mode 100644 tests/xfs/1885.out


diff --git a/doc/group-names.txt b/doc/group-names.txt
index 10b49e50517797..158f84d36d3154 100644
--- a/doc/group-names.txt
+++ b/doc/group-names.txt
@@ -117,6 +117,7 @@ samefs			overlayfs when all layers are on the same fs
 scrub			filesystem metadata scrubbers
 seed			btrfs seeded filesystems
 seek			llseek functionality
+selfhealing		self healing filesystem code
 selftest		tests with fixed results, used to validate testing setup
 send			btrfs send/receive
 shrinkfs		decreasing the size of a filesystem
diff --git a/tests/xfs/1885 b/tests/xfs/1885
new file mode 100755
index 00000000000000..73fd1a5392056e
--- /dev/null
+++ b/tests/xfs/1885
@@ -0,0 +1,53 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024-2025 Oracle.  All Rights Reserved.
+#
+# FS QA Test 1885
+#
+# Make sure that healthmon handles module refcount correctly.
+#
+. ./common/preamble
+_begin_fstest auto selfhealing
+
+. ./common/filter
+. ./common/module
+
+refcount_file="/sys/module/xfs/refcnt"
+test -e "$refcount_file" || _notrun "cannot find xfs module refcount"
+
+_require_test
+_require_xfs_io_command healthmon
+
+# Capture mod refcount without the test fs mounted
+_test_unmount
+init_refcount="$(cat "$refcount_file")"
+
+# Capture mod refcount with the test fs mounted
+_test_mount
+nomon_mount_refcount="$(cat "$refcount_file")"
+
+# Capture mod refcount with test fs mounted and the healthmon fd open.
+# Pause the xfs_io process so that it doesn't actually respond to events.
+$XFS_IO_PROG -c 'healthmon -c -v' $TEST_DIR >> $seqres.full &
+sleep 0.5
+kill -STOP %1
+mon_mount_refcount="$(cat "$refcount_file")"
+
+# Capture mod refcount with only the healthmon fd open.
+_test_unmount
+mon_nomount_refcount="$(cat "$refcount_file")"
+
+# Capture mod refcount after continuing healthmon (which should exit due to the
+# unmount) and killing it.
+kill -CONT %1
+kill %1
+wait
+nomon_nomount_refcount="$(cat "$refcount_file")"
+
+_within_tolerance "mount refcount" "$nomon_mount_refcount" "$((init_refcount + 1))" 0 -v
+_within_tolerance "mount + healthmon refcount" "$mon_mount_refcount" "$((init_refcount + 2))" 0 -v
+_within_tolerance "healthmon refcount" "$mon_nomount_refcount" "$((init_refcount + 1))" 0 -v
+_within_tolerance "end refcount" "$nomon_nomount_refcount" "$init_refcount" 0 -v
+
+status=0
+exit
diff --git a/tests/xfs/1885.out b/tests/xfs/1885.out
new file mode 100644
index 00000000000000..f152cef0525609
--- /dev/null
+++ b/tests/xfs/1885.out
@@ -0,0 +1,5 @@
+QA output created by 1885
+mount refcount is in range
+mount + healthmon refcount is in range
+healthmon refcount is in range
+end refcount is in range