NFSD: Update help text for CONFIG_NFSD

Clean up: refresh the help text for Kconfig items related to the NFS
server.  Remove obsolete URLs, and make the language consistent among
the options.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 47 insertions, 29 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index 12002775d299..a1dccb6a9c96 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1702,56 +1702,74 @@ config NFSD
         select PROC_FS if NFSD_V4
         select PROC_FS if SUNRPC_GSS
         help
-          If you want your Linux box to act as an NFS *server*, so that other
-          computers on your local network which support NFS can access certain
-          directories on your box transparently, you have two options: you can
-          use the self-contained user space program nfsd, in which case you
-          should say N here, or you can say Y and use the kernel based NFS
-          server. The advantage of the kernel based solution is that it is
-          faster.
+          Choose Y here if you want to allow other computers to access
+          files residing on this system using Sun's Network File System
+          protocol.  To compile the NFS server support as a module,
+          choose M here: the module will be called nfsd.
 
-          In either case, you will need support software; the respective
-          locations are given in the file <file:Documentation/Changes> in the
-          NFS section.
+          You may choose to use a user-space NFS server instead, in which
+          case you can choose N here.
 
-          If you say Y here, you will get support for version 2 of the NFS
-          protocol (NFSv2). If you also want NFSv3, say Y to the next question
-          as well.
+          To export local file systems using NFS, you also need to install
+          user space programs which can be found in the Linux nfs-utils
+          package, available from http://linux-nfs.org/.  More detail about
+          the Linux NFS server implementation is available via the
+          exports(5) man page.
 
-          Please read the NFS-HOWTO, available from
-          <http://www.tldp.org/docs.html#howto>.
+          Below you can choose which versions of the NFS protocol are
+          available to clients mounting the NFS server on this system.
+          Support for NFS version 2 (RFC 1094) is always available when
+          CONFIG_NFSD is selected.
 
-          To compile the NFS server support as a module, choose M here: the
-          module will be called nfsd.  If unsure, say N.
+          If unsure, say N.
 
 config NFSD_V2_ACL
         bool
         depends on NFSD
 
 config NFSD_V3
-        bool "Provide NFSv3 server support"
+        bool "NFS server support for NFS version 3"
         depends on NFSD
         help
-          If you would like to include the NFSv3 server as well as the NFSv2
-          server, say Y here.  If unsure, say Y.
+          This option enables support in your system's NFS server for
+          version 3 of the NFS protocol (RFC 1813).
+
+          If unsure, say Y.
 
 config NFSD_V3_ACL
-        bool "Provide server support for the NFSv3 ACL protocol extension"
+        bool "NFS server support for the NFSv3 ACL protocol extension"
         depends on NFSD_V3
         help
-          Implement the NFSv3 ACL protocol extension for manipulating POSIX
-          Access Control Lists on exported file systems. NFS clients should
-          be compiled with the NFSv3 ACL protocol extension; see the
-          CONFIG_NFS_V3_ACL option.  If unsure, say N.
+          Solaris NFS servers support an auxiliary NFSv3 ACL protocol that
+          never became an official part of the NFS version 3 protocol.
+          This protocol extension allows applications on NFS clients to
+          manipulate POSIX Access Control Lists on files residing on NFS
+          servers.  NFS servers enforce POSIX ACLs on local files whether
+          this protocol is available or not.
+
+          This option enables support in your system's NFS server for the
+          NFSv3 ACL protocol extension allowing NFS clients to manipulate
+          POSIX ACLs on files exported by your system's NFS server.  NFS
+          clients which support the Solaris NFSv3 ACL protocol can then
+          access and modify ACLs on your NFS server.
+
+          To store ACLs on your NFS server, you also need to enable ACL-
+          related CONFIG options for your local file systems of choice.
+
+          If unsure, say N.
 
 config NFSD_V4
-        bool "Provide NFSv4 server support (EXPERIMENTAL)"
+        bool "NFS server support for NFS version 4 (EXPERIMENTAL)"
         depends on NFSD && NFSD_V3 && EXPERIMENTAL
         select RPCSEC_GSS_KRB5
         help
-          If you would like to include the NFSv4 server as well as the NFSv2
-          and NFSv3 servers, say Y here.  This feature is experimental, and
-          should only be used if you are interested in helping to test NFSv4.
+          This option enables support in your system's NFS server for
+          version 4 of the NFS protocol (RFC 3530).
+
+          To export files using NFSv4, you need to install additional user
+          space programs which can be found in the Linux nfs-utils package,
+          available from http://linux-nfs.org/.
+
           If unsure, say N.
 
 config ROOT_NFS