libglusterfs/common-utils.c: Fix buffer size for checksum computation

Problem: When quorum count option is updated, the change is not reflected in
the nfs-server.vol file. This is because in get_checksum_for_file(), when the
last part of the file read has size less than buffer size, the read buffer
stores old data value along with correct data value.

Solution: Pass the bytes read instead of fixed buffer size, for calculating
checksum.

Change-Id: I4b641607c8a262961b3f3da0028a54e08c3f8589
fixes: bz#1672248
Signed-off-by: Varsha Rao <varao@redhat.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/bugs/glusterd/quorum-value-check.t b/tests/bugs/glusterd/quorum-value-check.t
new file mode 100755
index 00000000000..aaf636274b6
--- /dev/null
+++ b/tests/bugs/glusterd/quorum-value-check.t
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+
+function check_quorum_nfs() {
+    local qnfs="$(less /var/lib/glusterd/nfs/nfs-server.vol | grep "quorum-count"| awk '{print $3}')"
+    local qinfo="$($CLI volume info $V0| grep "cluster.quorum-count"| awk '{print $2}')"
+
+    if [ $qnfs = $qinfo ]; then
+        echo "Y"
+    else
+        echo "N"
+    fi
+}
+
+cleanup;
+
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume create $V0 replica 3 $H0:$B0/${V0}{0,1,2}
+TEST $CLI volume set $V0 nfs.disable off
+TEST $CLI volume set $V0 performance.write-behind off
+TEST $CLI volume set $V0 cluster.self-heal-daemon off
+TEST $CLI volume set $V0 cluster.quorum-type fixed
+TEST $CLI volume start $V0
+
+TEST $CLI volume set $V0 cluster.quorum-count 1
+EXPECT_WITHIN $CONFIG_UPDATE_TIMEOUT "Y" check_quorum_nfs
+TEST $CLI volume set $V0 cluster.quorum-count 2
+EXPECT_WITHIN $CONFIG_UPDATE_TIMEOUT "Y" check_quorum_nfs
+TEST $CLI volume set $V0 cluster.quorum-count 3
+EXPECT_WITHIN $CONFIG_UPDATE_TIMEOUT "Y" check_quorum_nfs
+
+cleanup;