[ndctl PATCH v4 6/6] ndctl, test: Add a unit test for the BTT checker

[Vishal Verma <vishal.l.verma@intel.com>]

Add a new unit test that will set up BTTs, corrupt them in known ways,
and test that the checker is able to detect or repair the corruption in
the expected way.

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 test/Makefile.am  |   3 +-
 test/btt-check.sh | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 174 insertions(+), 1 deletion(-)
 create mode 100755 test/btt-check.sh

diff --git a/test/Makefile.am b/test/Makefile.am
index 24afcea..b09d2dd 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -9,7 +9,8 @@ TESTS =\
 	create.sh \
 	clear.sh \
 	dax-errors.sh \
-	daxdev-errors.sh
+	daxdev-errors.sh \
+	btt-check.sh
 
 check_PROGRAMS =\
 	libndctl \
diff --git a/test/btt-check.sh b/test/btt-check.sh
new file mode 100755
index 0000000..11821d2
--- /dev/null
+++ b/test/btt-check.sh
@@ -0,0 +1,172 @@
+#!/bin/bash -E
+
+[ -f "../ndctl/ndctl" ] && [ -x "../ndctl/ndctl" ] && ndctl="../ndctl/ndctl"
+[ -f "./ndctl/ndctl" ] && [ -x "./ndctl/ndctl" ] && ndctl="./ndctl/ndctl"
+[ -z "$ndctl" ] && echo "Couldn't find an ndctl binary" && exit 1
+bus="nfit_test.0"
+json2var="s/[{}\",]//g; s/:/=/g"
+dev=""
+mode=""
+size=""
+sector_size=""
+blockdev=""
+bs=4096
+rc=77
+
+trap 'err $LINENO' ERR
+
+# sample json:
+# {
+#   "dev":"namespace5.0",
+#   "mode":"sector",
+#   "size":32440320,
+#   "uuid":"51805176-e124-4635-ae17-0e6a4a16671a",
+#   "sector_size":4096,
+#   "blockdev":"pmem5s"
+# }
+
+# $1: Line number
+# $2: exit code
+err()
+{
+	[ -n "$2" ] && rc="$2"
+	echo "test/btt-check: failed at line $1"
+	exit "$rc"
+}
+
+create()
+{
+	json=$($ndctl create-namespace -b "$bus" -t pmem -m sector)
+	eval "$(echo "$json" | sed -e "$json2var")"
+	[ -n "$dev" ] || err "$LINENO" 2
+	[ "$mode" = "sector" ] || err "$LINENO" 2
+	[ -n "$size" ] || err "$LINENO" 2
+	[ -n "$sector_size" ] || err "$LINENO" 2
+	[ -n "$blockdev" ] || err "$LINENO" 2
+	[ $size -gt 0 ] || err "$LINENO" 2
+}
+
+reset()
+{
+	$ndctl disable-region -b "$bus" all
+	$ndctl zero-labels -b "$bus" all
+	$ndctl enable-region -b "$bus" all
+}
+
+# re-enable the BTT namespace, and do IO to it in an attempt to
+# verify it still comes up ok, and functions as expected
+post_repair_test()
+{
+	echo "${FUNCNAME[0]}: I/O to BTT namespace"
+	test -b /dev/$blockdev
+	dd if=/dev/urandom of=test-bin bs=$sector_size count=$((size/sector_size)) > /dev/null 2>&1
+	dd if=test-bin of=/dev/$blockdev bs=$sector_size count=$((size/sector_size)) > /dev/null 2>&1
+	dd if=/dev/$blockdev of=test-bin-read bs=$sector_size count=$((size/sector_size)) > /dev/null 2>&1
+	diff test-bin test-bin-read
+	rm -f test-bin*
+	echo "done"
+}
+
+test_normal()
+{
+	echo "=== ${FUNCNAME[0]} ==="
+	# disable the namespace
+	$ndctl disable-namespace $dev
+	$ndctl check-namespace $dev
+	$ndctl enable-namespace $dev
+	post_repair_test
+}
+
+test_force()
+{
+	echo "=== ${FUNCNAME[0]} ==="
+	$ndctl check-namespace --force $dev
+	post_repair_test
+}
+
+set_raw()
+{
+	$ndctl disable-namespace $dev
+	echo -n "set raw_mode: "
+	echo 1 | tee /sys/bus/nd/devices/$dev/force_raw
+	$ndctl enable-namespace $dev
+	raw_bdev="${blockdev%%s}"
+	test -b /dev/$raw_bdev
+	raw_size="$(cat /sys/bus/nd/devices/$dev/size)"
+}
+
+unset_raw()
+{
+	$ndctl disable-namespace $dev
+	echo -n "set raw_mode: "
+	echo 0 | tee /sys/bus/nd/devices/$dev/force_raw
+	$ndctl enable-namespace $dev
+	raw_bdev=""
+}
+
+test_bad_info2()
+{
+	echo "=== ${FUNCNAME[0]} ==="
+	set_raw
+	seek="$((raw_size/bs - 1))"
+	echo "wiping info2 block (offset = $seek blocks)"
+	dd if=/dev/zero of=/dev/$raw_bdev bs=$bs count=1 seek=$seek
+	unset_raw
+	$ndctl disable-namespace $dev
+	$ndctl check-namespace $dev 2>&1 | grep "info2 needs to be restored"
+	$ndctl check-namespace --repair $dev
+	$ndctl enable-namespace $dev
+	post_repair_test
+}
+
+test_bad_info()
+{
+	echo "=== ${FUNCNAME[0]} ==="
+	set_raw
+	echo "wiping info block"
+	dd if=/dev/zero of=/dev/$raw_bdev bs=$bs count=1 seek=1
+	unset_raw
+	$ndctl disable-namespace $dev
+	$ndctl check-namespace $dev 2>&1 | grep "info block at offset 0x1000 needs to be restored"
+	$ndctl check-namespace --repair $dev
+	$ndctl enable-namespace $dev
+	post_repair_test
+}
+
+test_bitmap()
+{
+	echo "=== ${FUNCNAME[0]} ==="
+	reset && create
+	set_raw
+	# scribble over the last 4K of the map
+	rm -f /tmp/scribble
+	for (( i=0 ; i<512 ; i++ )); do
+		echo -n -e \\x1e\\x1e\\x00\\xc0\\x1e\\x1e\\x00\\xc0 >> /tmp/scribble
+	done
+	seek="$((raw_size/bs - (256*64/bs) - 2))"
+	echo "scribbling over map entries (offset = $seek blocks)"
+	dd if=/tmp/scribble of=/dev/$raw_bdev bs=$bs seek=$seek
+	rm -f /tmp/scribble
+	unset_raw
+	$ndctl disable-namespace $dev
+	$ndctl check-namespace $dev 2>&1 | grep "bitmap error"
+	# This is not repairable
+	reset && create
+}
+
+do_tests()
+{
+	test_normal
+	test_force
+	test_bad_info2
+	test_bad_info
+	test_bitmap
+}
+
+# setup (reset nfit_test dimms, create the BTT namespace)
+modprobe nfit_test
+rc=1
+reset && create
+do_tests
+reset
+exit 0
-- 
2.9.3

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