NFS: Update help text for CONFIG_NFS_FS

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

Also move the ROOT_NFS config option next to the options related to the
NFS client.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/Kconfig

@@ -1544,10 +1544,6 @@ config UFS_FS
           The recently released UFS2 variant (used in FreeBSD 5.x) is
           READ-ONLY supported.
 
-	  If you only intend to mount files from some other Unix over the
-	  network using NFS, you don't need the UFS file system support (but
-	  you need NFS file system support obviously).
-
 	  Note that this option is generally not needed for floppies, since a
 	  good portable way to transport files and directories between unixes
 	  (and even other operating systems) is given by the tar program ("man
@@ -1587,6 +1583,7 @@ menuconfig NETWORK_FILESYSTEMS
 	  Say Y here to get to see options for network filesystems and
 	  filesystem-related networking code, such as NFS daemon and
 	  RPCSEC security modules.
+
 	  This option alone does not add any kernel code.
 
 	  If you say N, all options in this submenu will be skipped and
@@ -1595,76 +1592,92 @@ menuconfig NETWORK_FILESYSTEMS
 if NETWORK_FILESYSTEMS
 
 config NFS_FS
-	tristate "NFS file system support"
+	tristate "NFS client support"
 	depends on INET
 	select LOCKD
 	select SUNRPC
 	select NFS_ACL_SUPPORT if NFS_V3_ACL
 	help
-	  If you are connected to some other (usually local) Unix computer
-	  (using SLIP, PLIP, PPP or Ethernet) and want to mount files residing
-	  on that computer (the NFS server) using the Network File Sharing
-	  protocol, say Y. "Mounting files" means that the client can access
-	  the files with usual UNIX commands as if they were sitting on the
-	  client's hard disk. For this to work, the server must run the
-	  programs nfsd and mountd (but does not need to have NFS file system
-	  support enabled in its kernel). NFS is explained in the Network
-	  Administrator's Guide, available from
-	  <http://www.tldp.org/docs.html#guide>, on its man page: "man
-	  nfs", and in the NFS-HOWTO.
-
-	  A superior but less widely used alternative to NFS is provided by
-	  the Coda file system; see "Coda file system support" below.
+	  Choose Y here if you want to access files residing on other
+	  computers using Sun's Network File System protocol.  To compile
+	  this file system support as a module, choose M here: the module
+	  will be called nfs.
 
-	  If you say Y here, you should have said Y to TCP/IP networking also.
-	  This option would enlarge your kernel by about 27 KB.
+	  To mount file systems exported by NFS servers, you also need to
+	  install the user space mount.nfs command which can be found in
+	  the Linux nfs-utils package, available from http://linux-nfs.org/.
+	  Information about using the mount command is available in the
+	  mount(8) man page.  More detail about the Linux NFS client
+	  implementation is available via the nfs(5) man page.
 
-	  To compile this file system support as a module, choose M here: the
-	  module will be called nfs.
+	  Below you can choose which versions of the NFS protocol are
+	  available in the kernel to mount NFS servers.  Support for NFS
+	  version 2 (RFC 1094) is always available when NFS_FS is selected.
 
-	  If you are configuring a diskless machine which will mount its root
-	  file system over NFS at boot time, say Y here and to "Kernel
-	  level IP autoconfiguration" above and to "Root file system on NFS"
-	  below. You cannot compile this driver as a module in this case.
-	  There are two packages designed for booting diskless machines over
-	  the net: netboot, available from
-	  <http://ftp1.sourceforge.net/netboot/>, and Etherboot,
-	  available from <http://ftp1.sourceforge.net/etherboot/>.
+	  To configure a system which mounts its root file system via NFS
+	  at boot time, say Y here, select "Kernel level IP
+	  autoconfiguration" in the NETWORK menu, and select "Root file
+	  system on NFS" below.  You cannot compile this file system as a
+	  module in this case.
 
-	  If you don't know what all this is about, say N.
+	  If unsure, say N.
 
 config NFS_V3
-	bool "Provide NFSv3 client support"
+	bool "NFS client support for NFS version 3"
 	depends on NFS_FS
 	help
-	  Say Y here if you want your NFS client to be able to speak version
-	  3 of the NFS protocol.
+	  This option enables support for version 3 of the NFS protocol
+	  (RFC 1813) in the kernel's NFS client.
 
 	  If unsure, say Y.
 
 config NFS_V3_ACL
-	bool "Provide client support for the NFSv3 ACL protocol extension"
+	bool "NFS client support for the NFSv3 ACL protocol extension"
 	depends on NFS_V3
 	help
-	  Implement the NFSv3 ACL protocol extension for manipulating POSIX
-	  Access Control Lists.  The server should also be compiled with
-	  the NFSv3 ACL protocol extension; see the CONFIG_NFSD_V3_ACL option.
+	  Some NFS servers support an auxiliary NFSv3 ACL protocol that
+	  Sun added to Solaris but 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
+	  ACLs on local files whether this protocol is available or not.
+
+	  Choose Y here if your NFS server supports the Solaris NFSv3 ACL
+	  protocol extension and you want your NFS client to allow
+	  applications to access and modify ACLs on files on the server.
+
+	  Most NFS servers don't support the Solaris NFSv3 ACL protocol
+	  extension.  You can choose N here or specify the "noacl" mount
+	  option to prevent your NFS client from trying to use the NFSv3
+	  ACL protocol.
 
 	  If unsure, say N.
 
 config NFS_V4
-	bool "Provide NFSv4 client support (EXPERIMENTAL)"
+	bool "NFS client support for NFS version 4 (EXPERIMENTAL)"
 	depends on NFS_FS && EXPERIMENTAL
 	select RPCSEC_GSS_KRB5
 	help
-	  Say Y here if you want your NFS client to be able to speak the newer
-	  version 4 of the NFS protocol.
+	  This option enables support for version 4 of the NFS protocol
+	  (RFC 3530) in the kernel's NFS client.
 
-	  Note: Requires auxiliary userspace daemons which may be found on
-		http://www.citi.umich.edu/projects/nfsv4/
+	  To mount NFS servers using NFSv4, you also need to install 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
+	bool "Root file system on NFS"
+	depends on NFS_FS=y && IP_PNP
+	help
+	  If you want your system to mount its root file system via NFS,
+	  choose Y here.  This is common practice for managing systems
+	  without local permanent storage.  For details, read
+	  <file:Documentation/filesystems/nfsroot.txt>.
+
+	  Most people say N here.
+
 config NFSD
 	tristate "NFS server support"
 	depends on INET
@@ -1746,20 +1759,6 @@ config NFSD_V4
 
 	  If unsure, say N.
 
-config ROOT_NFS
-	bool "Root file system on NFS"
-	depends on NFS_FS=y && IP_PNP
-	help
-	  If you want your Linux box to mount its whole root file system (the
-	  one containing the directory /) from some other computer over the
-	  net via NFS (presumably because your box doesn't have a hard disk),
-	  say Y. Read <file:Documentation/filesystems/nfsroot.txt> for
-	  details. It is likely that in this case, you also want to say Y to
-	  "Kernel level IP autoconfiguration" so that your box can discover
-	  its network address at boot time.
-
-	  Most people say N here.
-
 config LOCKD
 	tristate