[linux-lvm] [PATCH 30/35] test: add helper to compute aligned lv size

[Lukas Czerner]

For test purposes add a helper function to compute lv size as it
would be done by lvm tools.

Signed-off-by: Lukas Czerner <lczerner at redhat.com>
---
 test/lib/utils.sh |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/test/lib/utils.sh b/test/lib/utils.sh
index 4c3cd93..c555e45 100644
--- a/test/lib/utils.sh
+++ b/test/lib/utils.sh
@@ -177,6 +177,29 @@ kernel_at_least() {
     return 1
 }
 
+align_size_up() {
+    size=$1
+    [ -z $2 ] && stripes=0
+    [ -z $3 ] && extent=4
+
+    [ -z $size ] || [ -z $stripes ] || [ -z $extent ] && exit 1
+
+    tmp=$((size%extent))
+    if [ $tmp -ne 0 ]; then
+        size=$(($size+($extent-$tmp)))
+    fi
+    if [ $stripes -eq 0 ]; then
+        echo "$size"
+        return 0
+    fi
+    extents=$(($size/$extent))
+    tmp=$(($extents%$stripes))
+    if [ $tmp -ne 0 ]; then
+        extents=$(($extents-$tmp+$stripes))
+    fi
+    echo "$(($extents*$extent))"
+}
+
 . lib/paths || { echo >&2 you must run make first; exit 1; }
 
 PATH=$abs_top_builddir/test/lib:$PATH
-- 
1.7.4.4