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-rw-r--r--docs/tools/virtiofsd.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/tools/virtiofsd.rst b/docs/tools/virtiofsd.rst
index b208f2a..cc31402 100644
--- a/docs/tools/virtiofsd.rst
+++ b/docs/tools/virtiofsd.rst
@@ -183,6 +183,12 @@ Using ':' as the separator a rule is of the form:
'ok' as either an explicit terminator or for special handling of certain
patterns.
+- 'unsupported' - If a client tries to use a name matching 'key' it's
+ denied using ENOTSUP; when the server passes an attribute
+ name matching 'prepend' it's hidden. In many ways it's use is very like
+ 'ok' as either an explicit terminator or for special handling of certain
+ patterns.
+
**key** is a string tested as a prefix on an attribute name originating
on the client. It maybe empty in which case a 'client' rule
will always match on client names.