btrfs-progs: Add corrupted leaf repair testcase

tests/fsck-tests.sh

@@ -22,33 +22,63 @@ run_check()
 	"$@" >> $RESULT 2>&1 || _fail "failed: $@"
 }
 
+# For complicated fsck repair case,
+# where even repairing is OK, it may still report problem before or after
+# reparing since the repair needs several loops to repair all the problems
+# but report checks it before all repair loops done
+run_check_no_fail()
+{
+	echo "############### $@" >> $RESULT 2>&1
+	"$@" >> $RESULT 2>&1
+}
+
 rm -f $RESULT
 
 # test rely on corrupting blocks tool
 run_check make btrfs-corrupt-block
 
+# Supported test image formats:
+# 1) btrfs-image dump(.img files)
 # Some broken filesystem images are kept as .img files, created by the tool
-# btrfs-image, and others are kept as .tar.xz files that contain raw filesystem
+# btrfs-image
+#
+# 2) binary image dump only(only test.img in .tar.xz)
+# Some are kept as .tar.xz files that contain raw filesystem
 # image (the backing file of a loop device, as a sparse file). The reason for
 # keeping some as tarballs of raw images is that for these cases btrfs-image
 # isn't able to preserve all the (bad) filesystem structure for some reason.
+# This provides great flexibility at the cost of large file size.
+#
+# 3) script generated dump(generate_image.sh + needed things in .tar.gz)
+# The image is generated by the generate_image.sh script alone the needed
+# files in the tarball, normally a quite small btrfs-image dump.
+# This one combines the advatange of relative small btrfs-image and the
+# flexibility to support corrupted image.
 for i in $(find $here/tests/fsck-tests -name '*.img' -o -name '*.tar.xz' | sort)
 do
 	echo "     [TEST]    $(basename $i)"
 	echo "testing image $i" >> $RESULT
 
 	extension=${i#*.}
 
+	if [ -f generate_image.sh ]; then
+		rm generate_image.sh
+	fi
+
 	if [ $extension == "img" ]; then
 		run_check $here/btrfs-image -r $i test.img
 	else
 		run_check tar xJf $i
 	fi
 
+	if [ -x generate_image.sh ]; then
+		./generate_image.sh
+	fi
+
 	$here/btrfsck test.img >> $RESULT 2>&1
 	[ $? -eq 0 ] && _fail "btrfsck should have detected corruption"
 
-	run_check $here/btrfsck --repair test.img
+	run_check_no_fail $here/btrfsck --repair test.img
 	run_check $here/btrfsck test.img
 done