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commit a602bea3e7ccc5ce3da61d2c18245c4058983926
Author: Bryan Schumaker <bjschuma@netapp.com>
Date: Thu Jan 26 16:54:25 2012 -0500
NFS: Update idmapper documentation
Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff -up linux-3.2.noarch/Documentation/filesystems/nfs/idmapper.txt.orig linux-3.2.noarch/Documentation/filesystems/nfs/idmapper.txt
--- linux-3.2.noarch/Documentation/filesystems/nfs/idmapper.txt.orig 2012-01-04 18:55:44.000000000 -0500
+++ linux-3.2.noarch/Documentation/filesystems/nfs/idmapper.txt 2012-01-27 10:19:55.406740364 -0500
@@ -4,13 +4,21 @@ ID Mapper
=========
Id mapper is used by NFS to translate user and group ids into names, and to
translate user and group names into ids. Part of this translation involves
-performing an upcall to userspace to request the information. Id mapper will
-user request-key to perform this upcall and cache the result. The program
-/usr/sbin/nfs.idmap should be called by request-key, and will perform the
-translation and initialize a key with the resulting information.
+performing an upcall to userspace to request the information. There are two
+ways NFS could obtain this information: placing a call to /sbin/request-key
+or by placing a call to the rpc.idmap daemon.
+
+NFS will attempt to call /sbin/request-key first. If this succeeds, the
+result will be cached using the generic request-key cache. This call should
+only fail if /etc/request-key.conf is not configured for the id_resolver key
+type, see the "Configuring" section below if you wish to use the request-key
+method.
+
+If the call to /sbin/request-key fails (if /etc/request-key.conf is not
+configured with the id_resolver key type), then the idmapper will ask the
+legacy rpc.idmap daemon for the id mapping. This result will be stored
+in a custom NFS idmap cache.
- NFS_USE_NEW_IDMAPPER must be selected when configuring the kernel to use this
- feature.
===========
Configuring
|
