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