common/rc, scsi/011, zbd/010: introduce _page_size_equals() helper

Introduce new helper functions `_get_page_size` to get system page
size, and `_page_size_equals()` to check whether the system page size
equals to the value specified. Update `scsi/011` and `zbd/010` to use
the helpers and gracefully skip the tests if the page size is not
4096 bytes. This prevents test failures on 64K page architectures. The
failure is expected since F2FS does not support 64K page size.

According to the discussion at the Fixes tag link, it is expected the
test cases work well with 16K page size. However, this commit makes the
test cases skipped on systems with 16K page size. It is the left work to
enable the test cases under 16K page size condition.

Fixes: #234
Suggested-by: Bart Van Assche <[email protected]>
Signed-off-by: Yi Zhang <[email protected]>
[Shin'ichiro: amended commit message]
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: yizhanglinux

common/rc

@@ -552,6 +552,31 @@ _have_systemctl_unit() {
 	return 0
 }
 
+# Get system page size from kernel conguration
+_get_page_size() {
+	local page_shift
+
+	page_shift=$(_get_kernel_option PAGE_SHIFT)
+
+	echo $((1<< page_shift))
+}
+
+# Check if the system page size matches the required size (in bytes).
+# Example: _page_size_equals 4096
+_page_size_equals() {
+	local required_size="$1"
+	local current_size
+
+	current_size=$(_get_page_size)
+
+	if [ "$current_size" -ne "$required_size" ]; then
+		SKIP_REASONS+=("This test requires ${required_size} bytes page size, but system has ${current_size} bytes")
+		return 1
+	fi
+
+	return 0
+}
+
 _systemctl_start() {
 	local unit="$1"
 

tests/scsi/011

@@ -12,6 +12,7 @@ QUICK=1
 requires() {
 	_have_fio
 	_have_driver f2fs
+	_page_size_equals 4096
 	# See also commit 7643f3fe2772 ("f2fs: assign the write hint per stream
 	# by default"; v6.10).
 	_have_kver 6 10

tests/zbd/010

@@ -12,6 +12,7 @@ QUICK=1
 requires() {
 	_have_fio
 	_have_driver f2fs
+	_page_size_equals 4096
 	_have_module null_blk
 	_have_module_param scsi_debug zone_cap_mb
 	_have_program mkfs.f2fs