posix: add storage.reserve-size option

storage.reserve-size option will take size as input
instead of percentage. If set, priority will be given to
storage.reserve-size over storage.reserve. Default value
of this option is 0.

fixes: bz#1651445
Change-Id: I7a7342c68e436e8bf65bd39c567512ee04abbcea
Signed-off-by: Sheetal Pamecha <sheetal.pamecha08@gmail.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/tests/bugs/posix/bug-1651445.t b/tests/bugs/posix/bug-1651445.t
new file mode 100644
index 00000000000..f6f1833f919
--- /dev/null
+++ b/tests/bugs/posix/bug-1651445.t
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../snapshot.rc
+
+cleanup
+
+TEST verify_lvm_version
+TEST glusterd
+TEST pidof glusterd
+TEST init_n_bricks 3
+TEST setup_lvm 3
+
+TEST $CLI volume create $V0 replica 3 $H0:$L{1,2,3}
+TEST $CLI volume start $V0
+
+TEST glusterfs --volfile-id=/$V0 --volfile-server=$H0 $M0
+
+TEST $CLI volume set $V0 storage.reserve-size 10MB
+
+#No effect as priority to reserve-size
+TEST $CLI volume set $V0 storage.reserve 20
+
+TEST dd if=/dev/zero of=$M0/a bs=100M count=1
+sleep 5
+
+#Below dd confirms posix is giving priority to reserve-size
+TEST dd if=/dev/zero of=$M0/b bs=40M count=1
+
+sleep 5
+TEST ! dd if=/dev/zero of=$M0/c bs=5M count=1
+
+rm -rf $M0/*
+#Size will reserve from the previously set reserve option = 20%
+TEST $CLI volume set $V0 storage.reserve-size 0
+
+#Overwrite reserve option
+TEST $CLI volume set $V0 storage.reserve-size 40MB
+
+#wait 5s to reset disk_space_full flag
+sleep 5
+
+TEST dd if=/dev/zero of=$M0/a bs=100M count=1
+TEST dd if=/dev/zero of=$M0/b bs=10M count=1
+
+# Wait 5s to update disk_space_full flag because thread check disk space
+# after every 5s
+
+sleep 5
+# setup_lvm create lvm partition of 150M and 40M are reserve so after
+# consuming more than 110M next dd should fail
+TEST ! dd if=/dev/zero of=$M0/c bs=5M count=1
+
+TEST $CLI volume stop $V0
+TEST $CLI volume delete $V0
+
+cleanup