[PATCH blktests] loop: add test for creating/deleting file-ns

[Nilay Shroff <nilay@linux.ibm.com>]

This is regression test for commit be647e2c76b2
(nvme: use srcu for iterating namespace list)

This test uses a regulare file backed loop device
for creating and then deleting an NVMe namespace
in a loop.

Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
---
This regression was first reported[1], and now it's 
fixed in 6.10-rc4[2]

[1] https://lore.kernel.org/all/2312e6c3-a069-4388-a863-df7e261b9d70@linux.vnet.ibm.com/
[2] commit ff0ffe5b7c3c (nvme: fix namespace removal list)
---
 tests/nvme/051     | 65 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/nvme/051.out |  2 ++
 2 files changed, 67 insertions(+)
 create mode 100755 tests/nvme/051
 create mode 100644 tests/nvme/051.out

diff --git a/tests/nvme/051 b/tests/nvme/051
new file mode 100755
index 0000000..0de5c56
--- /dev/null
+++ b/tests/nvme/051
@@ -0,0 +1,65 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2024 Nilay Shroff(nilay@linux.ibm.com)
+#
+# Regression test for commit be647e2c76b2(nvme: use srcu for iterating
+# namespace list)
+
+. tests/nvme/rc
+
+DESCRIPTION="Test file-ns creation/deletion under one subsystem"
+
+requires() {
+	_nvme_requires
+	_have_loop
+	_require_nvme_trtype_is_loop
+}
+
+set_conditions() {
+	_set_nvme_trtype "$@"
+}
+
+test() {
+	echo "Running ${TEST_NAME}"
+
+	_setup_nvmet
+
+	local subsys="blktests-subsystem-1"
+	local iterations="${NVME_NUM_ITER}"
+	local loop_dev
+	local port
+
+	truncate -s "${NVME_IMG_SIZE}" "$(_nvme_def_file_path)"
+
+	loop_dev="$(losetup -f --show "$(_nvme_def_file_path)")"
+
+	port="$(_create_nvmet_port "${nvme_trtype}")"
+
+	_nvmet_target_setup --subsysnqn "${subsys}" --blkdev "${loop_dev}"
+
+	_nvme_connect_subsys --subsysnqn "${subsys}"
+
+	for ((i = 2; i <= iterations; i++)); do {
+		truncate -s "${NVME_IMG_SIZE}" "$(_nvme_def_file_path).$i"
+		_create_nvmet_ns "${subsys}" "${i}" "$(_nvme_def_file_path).$i"
+
+		# allow async request to be processed
+		sleep 1
+
+		_remove_nvmet_ns "${subsys}" "${i}"
+		rm "$(_nvme_def_file_path).$i"
+	}
+	done
+
+	_nvme_disconnect_subsys --subsysnqn "${subsys}" >> "${FULL}" 2>&1
+
+	_nvmet_target_cleanup --subsysnqn "${subsys}" --blkdev "${loop_dev}"
+
+	_remove_nvmet_port "${port}"
+
+	losetup -d "$loop_dev"
+
+	rm "$(_nvme_def_file_path)"
+
+	echo "Test complete"
+}
diff --git a/tests/nvme/051.out b/tests/nvme/051.out
new file mode 100644
index 0000000..156f068
--- /dev/null
+++ b/tests/nvme/051.out
@@ -0,0 +1,2 @@
+Running nvme/051
+Test complete
-- 
2.45.1