throtl/{002,003,007}, zbd/014: use _get_page_size to get PAGE_SIZE

Commit 8eca9fa ("common/rc, scsi/011, zbd/010: introduce
_page_size_equals() helper") introduced the helper bash function
_get_page_size(). Replace "getconf PAGE_SIZE" with the helper to cut
dependency to the getconf tool.

Link: #243
Signed-off-by: Yi Zhang <[email protected]>
[Shin'ichiro: removed getconf command check in zbd/014]
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: yizhanglinux

tests/throtl/002

@@ -21,7 +21,7 @@ test() {
 	local io_size_kb block_size
 	local iops=256
 
-	page_size=$(getconf PAGE_SIZE)
+	page_size=$(_get_page_size)
 
 	if ! _set_up_throtl --sector_size "${page_size}"; then
 		return 1;

tests/throtl/003

@@ -18,7 +18,7 @@ test() {
 	echo "Running ${TEST_NAME}"
 
 	local page_size
-	page_size=$(getconf PAGE_SIZE)
+	page_size=$(_get_page_size)
 
 	if ! _set_up_throtl --sector_size "${page_size}"; then
 		return 1;

tests/throtl/007

@@ -19,7 +19,7 @@ test() {
 	echo "Running ${TEST_NAME}"
 
 	local page_size
-	page_size=$(getconf PAGE_SIZE)
+	page_size=$(_get_page_size)
 
 	if ! _set_up_throtl --sector_size "${page_size}"; then
 		return 1;

tests/zbd/014

@@ -23,7 +23,6 @@ requires() {
 	_have_driver f2fs
 	_have_driver null_blk
 	_have_program fscrypt
-	_have_program getconf
 	_have_program mkfs.f2fs
 	for o in BLK_INLINE_ENCRYPTION_FALLBACK FS_ENCRYPTION_INLINE_CRYPT; do
 		if ! _check_kernel_option "$o"; then
@@ -112,7 +111,7 @@ run_test() {
 	local bio_max_vecs=256
 
 	local page_size
-	page_size=$(getconf PAGE_SIZE)
+	page_size=$(_get_page_size)
 
 	# In bytes.
 	local max_inl_encr_bio_size=$((bio_max_vecs * page_size))