xfstests: Make ext2 requirement explicit for test 049

Test 049 depends on ext2 module being supported by the kernel.

This patch makes it a explicit, instead of failing the test with
obscure message.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>

049

@@ -64,6 +64,7 @@ _require_nobigloopfs
 _require_nonexternal
 _require_scratch
 _require_loop
+_require_ext2
 
 rm -f $seq.full
 

common.rc

@@ -769,6 +769,24 @@ _require_loop()
     fi
 }
 
+# this test requires ext2 filesystem support
+#
+_require_ext2()
+{
+    if [ "$HOSTOS" != "Linux" ]
+    then
+	_notrun "This test requires linux for ext2 filesystem support"
+    fi
+
+    modprobe ext2 >/dev/null 2>&1
+    if grep ext2 /proc/filesystems >/dev/null 2>&1
+    then
+	:
+    else
+	_notrun "This test requires ext2 filesystem support"
+    fi
+}
+
 # this test requires that (large) loopback device files are not in use
 #
 _require_nobigloopfs()