Try and fix the exports.5 man page so that it clarifies how
NFSv4 exports are handled. Improved by informal review comments from mckusick, kudak at mit.edu and bde. This is a content change. MFC after: 2 weeks
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@ -28,7 +28,7 @@
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.\" @(#)exports.5 8.3 (Berkeley) 3/29/95
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.\" $FreeBSD$
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.\"
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.Dd December 3, 2009
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.Dd July 12, 2011
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.Dt EXPORTS 5
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.Os
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.Sh NAME
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@ -72,6 +72,13 @@ that can be mounted on by the corresponding client(s).
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There are three forms of this specification.
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The first is to list all mount points as absolute
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directory paths separated by whitespace.
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This list of directory paths should be considered an
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.Dq administrative control ,
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since it is only enforced by the
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.Xr mountd 8
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daemon and not the kernel.
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As such, it only applies to NFSv2 and NFSv3 mounts and only
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with respect to the client's use of the mount protocol.
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The second is to specify the pathname of the root of the file system
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followed by the
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.Fl alldirs
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@ -81,8 +88,21 @@ including regular files if the
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.Fl r
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option is used on
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.Xr mountd 8 .
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Because NFSv4 does not use the mount protocol,
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the
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.Dq administrative controls
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are not applied.
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Thus, all the above export line(s) should be considered to have the
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.Fl alldirs
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flag, even if the line is specified without it.
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The third form has the string ``V4:'' followed by a single absolute path
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name, to specify the NFSv4 tree root.
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This line does not export any file system, but simply marks where the root
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of the server's directory tree is for NFSv4 clients.
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The exported file systems for NFSv4 are specified via the other lines
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in the
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.Xr exports 5
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file in the same way as for NFSv2 and NFSv3.
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The pathnames must not have any symbolic links in them and should not have
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any
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.Dq Pa \&.
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