[LTP] [PATCH v3 2/2] mkswap: make the test device size is aligned to pagesize

[Li Wang <liwang@redhat.com>]

We get failures like below because of 'DEVICE_SIZE-10000' makes the
test device size is not aligned to system PAGE_SIZE any more.

   mkswap01 1 TINFO : Found free device '/dev/loop1'
   mkswap01 1 TPASS : 'mkswap   /dev/loop1 ' passed.
   mkswap01 2 TFAIL : 'mkswap -f  /dev/loop1 92400' failed, not expected.
   mkswap01 3 TINFO : Can not do swapon on /dev/loop1.
   mkswap01 3 TINFO : Device size specified by 'mkswap' greater than real size.
   mkswap01 3 TINFO : Swapon failed expectedly.
   mkswap01 3 TPASS : 'mkswap -f  /dev/loop1 112400' passed.

For the issue, we do some changes in this patch:

1. The orignal test device(LTP_DEV) size is also not aligned to
   PAGE_SIZE on all arches. Here fix it.

2. Get the size of the device and align it down to be the multiple
   of $PAGE_SIZE and use that as the size for testing.

3. Increase/decrease the $DEVICE_SIZE according to system PAGE_SIZE

Signed-off-by: Li Wang <liwang@redhat.com>
---
 runltp                                |  2 +-
 testcases/commands/mkswap/mkswap01.sh | 11 +++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/runltp b/runltp
index 3a46765..bb2e5d8 100755
--- a/runltp
+++ b/runltp
@@ -978,7 +978,7 @@ main()
 create_block()
 {
     #create a block device
-    dd if=/dev/zero of=${TMP}/test.img bs=1kB count=153600 >/dev/null 2>&1
+    dd if=/dev/zero of=${TMP}/test.img bs=1024 count=153600 >/dev/null 2>&1
     if [ $? -ne 0 ]; then
         echo "Failed to create loopback device image, please check disk space and re-run"
         return 1
diff --git a/testcases/commands/mkswap/mkswap01.sh b/testcases/commands/mkswap/mkswap01.sh
index 9727b0f..1948ff4 100755
--- a/testcases/commands/mkswap/mkswap01.sh
+++ b/testcases/commands/mkswap/mkswap01.sh
@@ -34,9 +34,12 @@ setup()
 
 	UUID=`uuidgen`
 
-	DEVICE_SIZE=$((`blockdev --getsize64 $TST_DEVICE`/1024))
-
 	PAGE_SIZE=`getconf PAGE_SIZE`
+
+	# Here get the size of the device and align it down to be the
+	# multiple of $PAGE_SIZE and use that as the size for testing.
+	real_size=`blockdev --getsize64 $TST_DEVICE`
+	DEVICE_SIZE=$((($real_size/$PAGE_SIZE * $PAGE_SIZE)/1024))
 }
 
 cleanup()
@@ -169,8 +172,8 @@ mkswap_test()
 setup
 
 mkswap_test "" "" "$TST_DEVICE"
-mkswap_test "" "" "$TST_DEVICE" "$((DEVICE_SIZE-10000))"
-mkswap_test "-f" "" "$TST_DEVICE" "$((DEVICE_SIZE+10000))"
+mkswap_test "" "" "$TST_DEVICE" "$((DEVICE_SIZE-PAGE_SIZE/1024))"
+mkswap_test "-f" "" "$TST_DEVICE" "$((DEVICE_SIZE+PAGE_SIZE/1024))"
 mkswap_test "-c" "" "$TST_DEVICE"
 mkswap_test "-p" "2048" "$TST_DEVICE"
 mkswap_test "-L" "ltp_testswap" "-L ltp_testswap" "" "/dev/disk/by-label/ltp_testswap"
-- 
1.8.3.1