update manpages for showmount and mountd

[nfs-utils.git] / utils / mountd / mountd.man

diff --git a/utils/mountd/mountd.man b/utils/mountd/mountd.man
index 70166c1283a2aa58dace9149c4562dae6f0029ed..4276663fa34ddb8d0dffe6a8a31709168f57519e 100644 (file)
--- a/utils/mountd/mountd.man
+++ b/utils/mountd/mountd.man
@@ -125,6 +125,13 @@ If this option is not specified the default of
 .BR /var/lib/nfs
 is used.
 .TP
+.BI "\-r," "" " \-\-reverse\-lookup"
+mountd tracks IP addresses in the rmtab, and when a DUMP request is made (by
+someone running showmount -a, for instance), it returns IP addresses instead
+of hostnames by default. This option causes mountd to do a reverse
+lookup on each IP address and return that hostname instead. Enabling this can
+have a substantial negative effect on performance in some situations.
+.TP
 .BR "\-t N" " or " "\-\-num\-threads=N"
 This option specifies the number of worker threads that rpc.mountd
 spawns.  The default is 1 thread, which is probably enough.  More
@@ -143,6 +150,21 @@ can support both NFS version 2 and the newer version 3.
 Print the version of
 .B rpc.mountd
 and exit.
+.TP
+.B \-g " or " \-\-manage-gids
+Accept requests from the kernel to map user id numbers into  lists of
+group id numbers for use in access control.  An NFS request will
+normally (except when using Kerberos or other cryptographic
+authentication) contains a user-id and a list of group-ids.  Due to a
+limitation in the NFS protocol, at most 16 groups ids can be listed.
+If you use the
+.B \-g
+flag, then the list of group ids received from the client will be
+replaced by a list of group ids determined by an appropriate lookup on
+the server. Note that the 'primary' group id is not affected so a
+.I newgroup
+command on the client will still be effective.  This function requires
+a Linux Kernel with version at least 2.6.21.
 
 .SH TCP_WRAPPERS SUPPORT
 This