qa: test xattr snap wb

qa/workunits/snaptest-xattrflush.sh

@@ -0,0 +1,21 @@
+#!/bin/sh -x
+
+set -e
+
+mkdir a
+mkdir a/b
+mkdir a/b/c
+# b now has As but not Ax
+setfattr -n user.foo a/b
+mkdir a/.snap/s
+mkdir a/b/cc
+# b now has been cowed on the server, but we still have dirty xattr caps
+getfattr -n user.foo a/b          # there they are...
+r=`getfattr -n user.foo a/.snap/s/b`  # should be there, too!
+echo $r
+[ -z "$r" ] && echo "didn't find user.foo xattr in snapped version" && false
+
+# ok, clean up
+rmdir a/.snap/s
+rm -r a
+