1 files changed, 69 insertions, 0 deletions
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_clone/zfs_clone_deeply_nested.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_clone/zfs_clone_deeply_nested.ksh
new file mode 100755
index 000000000000..b83807765791
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_clone/zfs_clone_deeply_nested.ksh
@@ -0,0 +1,69 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# Deeply nested clones can be created and destroyed successfully
+#
+# STRATEGY:
+# 1. Create a deeply nested chain of clones
+# 2. Verify we can promote and destroy datasets in the chain without issues
+# NOTE:
+# Ported from scripts used to reproduce issue #3959 and #7279
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	destroy_dataset "$clonesfs" "-rRf"
+}
+log_onexit cleanup
+
+log_assert "Deeply nested clones should be created and destroyed without issues"
+
+snapname='snap'
+snaprename='temporary-snap'
+clonesfs="$TESTPOOL/$TESTFS1"
+
+# NOTE: set mountpoint=none to avoid mount/umount calls and speed up the process
+log_must zfs create -o mountpoint=none $clonesfs
+log_must zfs create $clonesfs/0
+dsname="$clonesfs/0@$snapname"
+log_must zfs snapshot $dsname
+
+# 1. Create a deeply nested chain of clones
+for c in {1..250}; do
+	log_must zfs clone $dsname $clonesfs/$c
+	dsname="$clonesfs/$c@$snapname"
+	log_must zfs snapshot $dsname
+done
+
+# 2. Verify we can promote and destroy datasets in the chain without issues
+for c in {0..249}; do
+	log_must zfs rename $clonesfs/$c@$snapname $clonesfs/$c@$snaprename
+	log_must zfs promote $clonesfs/$((c+1))
+	log_must zfs destroy -r $clonesfs/$c
+	log_must zfs destroy $clonesfs/$((c+1))@$snaprename
+done
+
+log_pass "Deeply nested clones can be created and destroyed successfully"