Add test case

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

tests/runfiles/common.run

@@ -704,7 +704,7 @@ tags = ['functional', 'nestedfs']
 
 [tests/functional/no_space]
 tests = ['enospc_001_pos', 'enospc_002_pos', 'enospc_003_pos',
-    'enospc_df', 'enospc_rm']
+    'enospc_df', 'enospc_ganging.ksh', 'enospc_rm']
 tags = ['functional', 'no_space']
 
 [tests/functional/nopwrite]

tests/zfs-tests/tests/Makefile.am

@@ -1539,6 +1539,7 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
 	functional/no_space/enospc_002_pos.ksh \
 	functional/no_space/enospc_003_pos.ksh \
 	functional/no_space/enospc_df.ksh \
+	functional/no_space/enospc_ganging.ksh \
 	functional/no_space/enospc_rm.ksh \
 	functional/no_space/setup.ksh \
 	functional/online_offline/cleanup.ksh \

tests/zfs-tests/tests/functional/no_space/enospc_ganging.ksh

@@ -0,0 +1,86 @@
+#!/bin/ksh
+
+#
+# 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.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# Exercise gang block IO paths for non-encrypted and encrypted datasets.
+#
+
+verify_runnable "both"
+log_assert "Verify IO when file system is full and ganging."
+
+function cleanup
+{
+        log_must set_tunable64 METASLAB_FORCE_GANGING $metaslab_force_ganging
+	default_cleanup_noexit
+}
+
+log_onexit cleanup
+
+default_setup_noexit $DISKS
+
+typeset metaslab_force_ganging=$(get_tunable METASLAB_FORCE_GANGING)
+shift=$(random_int_between 15 17)
+log_must set_tunable64 METASLAB_FORCE_GANGING $((2**$shift))
+
+keyfile=/$TESTPOOL/keyencfods
+log_must eval "echo 'password' > $keyfile"
+bs=1024k
+count=512
+
+log_must dd if=/dev/urandom of=$TESTDIR/data bs=$bs count=$count
+data_checksum=$(sha256digest $TESTDIR/data)
+
+# Test common large block configuration.
+log_must zfs create -o recordsize=1m -o primarycache=metadata $TESTPOOL/gang
+mntpnt=$(get_prop mountpoint $TESTPOOL/gang)
+
+log_must dd if=$TESTDIR/data of=$mntpnt/file bs=$bs count=$count
+sync_pool $TESTPOOL
+log_must dd if=$mntpnt/file of=$TESTDIR/out bs=$bs count=$count
+out_checksum=$(sha256digest $TESTDIR/out)
+
+if [[ "$data_checksum" != "$out_checksum" ]]; then
+    log_fail "checksum mismatch ($data_checksum != $out_checksum)"
+fi
+
+log_must rm -f $TESTDIR/out
+log_must zfs destroy $TESTPOOL/gang
+
+# Test common large block configuration with encryption.
+log_must zfs create \
+	-o recordsize=1m \
+	-o primarycache=metadata \
+	-o compression=off \
+	-o encryption=on \
+	-o keyformat=passphrase \
+	-o keylocation=file://$keyfile \
+	-o copies=2 \
+	$TESTPOOL/gang
+mntpnt=$(get_prop mountpoint $TESTPOOL/gang)
+
+log_must dd if=$TESTDIR/data of=$mntpnt/file bs=$bs count=$count
+sync_pool $TESTPOOL
+log_must dd if=$mntpnt/file of=$TESTDIR/out bs=$bs count=$count
+out_checksum=$(sha256digest $TESTDIR/out)
+
+if [[ "$data_checksum" != "$out_checksum" ]]; then
+    log_fail "checksum mismatch ($data_checksum != $out_checksum)"
+fi
+
+log_must rm -f $TESTDIR/out
+log_must zfs destroy $TESTPOOL/gang
+
+log_pass "Verified IO when file system is full and ganging."