Skip tests if scsi_debug module is already loaded and in use

Several tests across block/, scsi/, dm/, md/, zbd/, nvme/ require exclusive
access to the scsi_debug module because they load, unload or reconfigure it.
When scsi_debug is already loaded by the environment (e.g., by another
driver or a previous setup), these tests fail with:

modprobe: FATAL: Module scsi_debug is in use.
Unloading scsi_debug failed

scsi_debug            327680  4

Instead of modifying common rc files—which would overskip unrelated tests,
this patch adds "_module_not_in_use scsi_debug" only to the tests that
actually depend on exclusive access to scsi_debug.

Signed-off-by: Disha Goel <[email protected]>

Author: disgoel

tests/block/001

@@ -16,6 +16,7 @@ requires() {
 	_have_scsi_debug
 	_have_kernel_option BLK_DEV_SD
 	_have_driver sr_mod
+	_module_not_in_use scsi_debug
 }
 
 stress_scsi_debug() {

tests/block/002

@@ -14,6 +14,7 @@ QUICK=1
 requires() {
 	_have_blktrace
 	_have_scsi_debug
+	_module_not_in_use scsi_debug
 }
 
 test() {

tests/block/025

@@ -13,6 +13,7 @@ DESCRIPTION="do a huge discard with 4k sector size"
 
 requires() {
 	_have_module scsi_debug
+	_module_not_in_use scsi_debug
 }
 
 test() {

tests/block/027

@@ -22,6 +22,7 @@ requires() {
 	_have_cgroup2_controller io
 	_have_scsi_debug
 	_have_fio
+	_module_not_in_use scsi_debug
 }
 
 scsi_debug_stress_remove() {

tests/block/028

@@ -13,6 +13,7 @@ DMESG_FILTER="sed -r 's/(guard tag error at sector|ref tag error at location)/bl
 
 requires() {
 	_have_module scsi_debug
+	_module_not_in_use scsi_debug
 }
 
 test_pi() {

tests/block/032

@@ -15,6 +15,7 @@ QUICK=1
 requires() {
 	_have_xfs
 	_have_module scsi_debug
+	_module_not_in_use scsi_debug
 }
 
 test() {

tests/block/037

@@ -20,6 +20,7 @@ QUICK=1
 requires() {
 	_have_cgroup2_controller io
 	_have_scsi_debug
+	_module_not_in_use scsi_debug
 }
 
 scsi_debug_rebind() {

tests/dm/003

@@ -13,6 +13,7 @@ QUICK=1
 
 requires() {
 	_have_scsi_debug
+	_module_not_in_use scsi_debug
 }
 
 setup_test_device() {

tests/loop/004

@@ -15,6 +15,7 @@ requires() {
 	_have_module scsi_debug
 	_have_src_program loblksize
 	_have_loop_set_block_size
+	_module_not_in_use scsi_debug
 }
 
 test() {

tests/md/004

@@ -16,6 +16,7 @@ requires() {
 	_have_scsi_debug
 	_have_driver linear
 	_have_driver raid0
+	_module_not_in_use scsi_debug
 }
 
 setup_test_device() {